JP2023168441A - Near infrared absorbable fiber, woven fabric, or nonwoven fabric - Google Patents

Abstract

To provide a woven fabric or a nonwoven fabric which include a near infrared absorbable pigment and can provide a desirable designability.SOLUTION: There are disclosed a near infrared absorbable woven fabric or a nonwoven fabric including a near infrared absorbable pigment, wherein the near infrared absorbable woven fabric or the nonwoven fabric is characterized by that the near infrared absorbable pigment includes one kinds or more kinds selected from a group comprising a specified composite tungsten oxide and a tungsten oxide having a Magneli phase, a content of the near infrared absorbable pigment per an area of the near infrared absorbable woven fabric or the nonwoven fabric is 0.05 g/m2 or over and 0.5 g/m2 or under, an L* in CIE1976 color space is 30 or over, and a color difference ΔE in CIE1976 color space between those of the near infrared absorbable woven fabric or the nonwoven fabric and those of the near infrared absorbable woven fabric or the nonwoven fabric when not including the near infrared absorbable pigment is 10 or under.SELECTED DRAWING: None

Description

The present invention relates to infrared absorbing fibers, knitted fabrics, or nonwoven fabrics.

Textile products that have the property of absorbing light and generating heat are known. For example, infrared absorbing pigments such as carbon black have the property of absorbing infrared rays and generating heat, and therefore, heat-generating fibers can be obtained by kneading or coating this into fibers.

However, fibers containing carbon black as an infrared absorbing pigment have a problem in that the color tone becomes extremely dark due to the black color of carbon black, making it impossible to apply designs with bright colors.

In this regard, Patent Document 1 describes a fiber containing composite tungsten oxide fine particles typified by Cs _0.33 WO ₃ as an infrared absorbing pigment, and in which the content of the fine particles is less than the solid content of the fiber. On the other hand, infrared absorbing fibers having a content of 0.001 to 80% by weight are described.

Composite tungsten oxide has a brighter color than the black color of carbon black. Therefore, fiber products containing composite tungsten oxide have the advantage of greater freedom in design than fiber products containing carbon black.

Japanese Patent Application Publication No. 2006-132042

Composite tungsten oxide, such as Cs _0.33 WO ₃ (hereinafter referred to as CsWO), exhibits a light bluish-green color that is visible under visible light, and when applied to bright-toned textile products, the color tone of the resulting textile product changes. may change.

In general, heat-generating cold-weather clothing does not need to be made entirely of heat-generating textiles; instead, heat-generating textiles are used only in the parts of the clothing where heat generation contributes to cold protection, and other The section consists of ordinary textile products. At this time, if a textile product containing CsWO is used as a heat-generating textile product, a difference in color tone may occur between the part containing CsWO and the part not containing CsWO, which may cause problems in terms of design. This tendency is remarkable when the color tone of the target clothing is particularly bright.

Furthermore, according to Patent Document 1, the CsWO content in infrared absorbing fibers is presented in a wide range from 0.001 to 80% by weight based on the solid content of the fibers, and is used as cold weather clothing. This includes cases where the exothermic property is insufficient and cases where the exothermic property is excessive.

The present invention has been made in view of the above circumstances. Therefore, an object of the present invention is to provide fibers, knitted fabrics, or nonwoven fabrics containing infrared absorbing pigments and having the property of absorbing infrared rays and generating heat, which are preferable when applied to clothing such as winter clothing. An object of the present invention is to provide fibers, knitted fabrics, or nonwoven fabrics that can provide design properties.

The present invention for solving the above problems is as follows.

<Aspect 1> An infrared absorbing fiber, knitted fabric, or nonwoven fabric containing an infrared absorbing pigment,
L ^* in CIE1976 color space is 30 or more, and
The color difference ΔE in the CIE 1976 color space between the infrared absorbing fiber, knitted fabric, or nonwoven fabric and when the infrared absorbing fiber, knitted fabric, or nonwoven fabric does not contain the infrared absorbing pigment is 10 or less.
Infrared absorbing fibers, knitted fabrics, or nonwoven fabrics.
<<Aspect 2>> The infrared absorbing fiber, knitted fabric, or fabric according to Aspect 1, wherein the L ^* in the CIE 1976 color space is greater than 90 and satisfies at least one of the following (i) to (iv). Non-woven fabric:
(i) a ^* in CIE1976 color space is -10 or less;
(ii) a ^* in the CIE 1976 color space is 10 or more;
(iii) b ^* in the CIE 1976 color space is -10 or less; and (iv) b ^* in the CIE 1976 color space is 10 or more.
<Aspect 3> The infrared absorbing fiber, knitted fabric, or nonwoven fabric according to aspect 1, wherein the L ^* in CIE 1976 color space is 90 or less.
<Aspect 4> The content of the infrared absorbing pigment is
The amount of the infrared absorbing fiber is 0.01% by mass or more and 0.50% by mass or less based on the total mass of the infrared absorbing fiber,
For the infrared absorbing knitted fabric or nonwoven fabric, the amount is 0.05 g/m ² or more and 0.50 g/m ² or less per area of the infrared absorbing knitted fabric or nonwoven fabric.
The infrared absorbing fiber, knitted fabric, or nonwoven fabric according to any one of aspects 1 to 3.
<Aspect 5> The infrared absorbing pigment is
General formula M _x W _y O _z (1)
{In formula (1), M is H, He, alkali metal element, alkaline earth metal element, rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt , Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo , Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, and x, y, and z are Each is a positive number, 0<x/y≦1, and 2.2≦z/y≦3.0}
Composite tungsten oxide represented by and general formula W _y O _z (2)
{In formula (2), W is tungsten, O is oxygen, y and z are each positive numbers, and 2.45≦z/y≦2.999}
The infrared absorbing fiber, knitted fabric, or nonwoven fabric according to any one of aspects 1 to 4, comprising one or more selected from the group consisting of tungsten oxide having a Magneli phase represented by:
<Aspect 6> The infrared absorbing fiber according to any one of aspects 1 to 5.
<Aspect 7> An infrared absorbing knitted fabric or nonwoven fabric comprising the infrared absorbing fiber according to aspect 6.
<Aspect 8> Consisting of the infrared absorbing fiber according to aspect 6 and a fiber containing no infrared absorbing pigment,
The fiber that does not contain the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing fiber.
Infrared absorbing knitted fabric or nonwoven fabric.
<Aspect 9> The infrared absorbing knitted fabric or nonwoven fabric according to any one of aspects 1 to 5.
<Aspect 10> The infrared absorbing knitted fabric or nonwoven fabric according to aspect 9, which is composed of an infrared absorbing fiber containing an infrared absorbing pigment.
<Aspect 11> Consisting of an infrared absorbing fiber containing an infrared absorbing pigment and a fiber not containing an infrared absorbing pigment,
The fiber that does not contain the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing fiber.
The infrared absorbing knitted fabric or nonwoven fabric according to aspect 9.
<Aspect 12> An infrared absorbing garment comprising the infrared absorbing knitted fabric or nonwoven fabric according to any one of aspects 7 to 11.
<<Aspect 13>> Consisting of the infrared absorbing knitted fabric or nonwoven fabric according to any one of Aspects 7 to 11, and the knitted fabric or nonwoven fabric containing no infrared absorbing pigment,
The knitted fabric or nonwoven fabric that does not contain the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing knitted fabric or nonwoven fabric.
Infrared absorbing clothing.

According to the present invention, a fiber, knitted fabric, or nonwoven fabric containing an infrared absorbing pigment and having the property of absorbing infrared rays and generating heat, when applied to clothing such as cold weather clothing, has a desirable design property. A fiber, knitted fabric, or nonwoven fabric that can be provided is provided.

The infrared absorbing fiber, knitted fabric, or nonwoven fabric of the present invention is
An infrared absorbing fiber, knitted fabric, or nonwoven fabric containing an infrared absorbing pigment,
L ^* in CIE1976 color space is 30 or more, and
The color difference ΔE in the CIE 1976 color space between the infrared absorbing fiber, knitted fabric, or nonwoven fabric and the case where the infrared absorbing fiber, knitted fabric, or nonwoven fabric does not contain the infrared absorbing pigment is 10 or less.

The infrared absorbing fiber, knitted fabric, or nonwoven fabric of the present invention further comprises:
It may be an infrared absorbing fiber, a knitted fabric, or a nonwoven fabric, which has L ^* in the CIE 1976 color space of more than 90 and satisfies at least one of the following (i) to (iv):
(i) a ^* in CIE1976 color space is -10 or less;
(ii) a ^* in the CIE 1976 color space is 10 or more;
(iii) b ^* in the CIE 1976 color space is -10 or less; and (iv) b ^* in the CIE 1976 color space is 10 or more.

The infrared absorbing fiber, knitted fabric, or nonwoven fabric of the present invention may alternatively be
L ^* in CIE1976 color space is 90 or less,
It may be an infrared absorbing fiber, a knitted fabric, or a nonwoven fabric.

In this specification, "knitted fabric" is a concept that includes both fabric (woven fabric) and knitted fabric (knitted fabric). The term "nonwoven fabric" refers to a sheet-like material made of intertwined fibers, and does not include woven or knitted fabrics. Hereinafter, fibers, knitted fabrics, and nonwoven fabrics may be collectively referred to as "textile products."

In this specification, an infrared absorbing fiber product having an L ^* of 30 or more in the CIE 1976 color space is sometimes referred to as an "L ^* requirement", and the infrared absorbing fiber product and the infrared absorbing fiber A color difference ΔE of 10 or less in the CIE 1976 color space compared to when the product does not contain the infrared absorbing pigment is sometimes referred to as "ΔE requirement".

The color difference ΔE is defined as (L ^* , a ^* , b ^* ), which is the color in the CIE 1976 color space of the infrared absorbing textile product, and the color difference ΔE in the CIE 1976 color space when the infrared absorbing textile product does not contain an infrared absorbing pigment. When the color is (L ₀ ^* , a ₀ ^* , b ₀ ^* ), it is a value expressed by the following formula.
ΔE={(L ^* - L ₀ ^* ) ² + (a ^* - a ₀ ^* ) ² + (b ^* - b ₀ ^* ) ² } ^1/2

In order to solve the problems of the present invention, the present inventors
The color tone of textile products without infrared absorbing pigments,
The amount of infrared absorbing pigment contained in the infrared absorbing textile product,
Changes in color tone of textile products when containing a predetermined amount of infrared absorbing pigment;
The relationship between the heat generation properties of textile products and the presence of a predetermined amount of infrared absorbing pigment was investigated in detail.

As a result, we found the following:
(1) In the case of dark-colored textile products, the change in color of the textile product between when it does not contain an infrared absorbing pigment and when it does contain an infrared absorbing pigment is so small that it does not pose a problem in the first place;
(2) Among brightly colored textile products, especially in bright colors, textile products with low saturation are more susceptible to changes in color tone due to the inclusion of infrared absorbing pigments than textile products with bright colors with high saturation. (3) The brightly colored textile products contain infrared absorbing pigments in a range where it is difficult to discern changes in color tone, thereby exhibiting heat generating properties that are comfortable for cold-weather clothing.

The present invention has been made based on the above findings.

In the infrared-absorbing textile product of the present invention, if L ^* in the CIE 1976 color space is 30 or more, the inclusion of a significant amount of infrared-absorbing pigment may cause the textile product to change to the extent that color tone change may become a problem. Bright colors. Therefore, dark-toned textile products with an L ^* of less than 30, which contain significant amounts of infrared-absorbing pigments but have difficult to discern changes in tone, are excluded from the scope of the present invention.

In the infrared absorbing textile product of the present invention, a color difference ΔE of 10 or less in the CIE 1976 color space between when the infrared absorbing pigment is included and when it is not included means that the textile product can discriminate changes in color tone. Indicates that it contains infrared absorbing pigments to a certain extent. Textile products that meet this requirement not only have heat generation properties that are comfortable for cold-weather clothing, but also reduce the difference in color tone between areas that do not contain infrared absorbing pigments, thereby exhibiting desirable design properties. be able to.

When the infrared absorbing textile product of the present invention has a particularly bright color tone, the inclusion of an infrared absorbing pigment makes it easier to visually identify changes in the color tone of the textile product. In view of this, when the brightness of the color tone of the textile product is particularly high, it is advantageous to have a higher chroma from the viewpoint of making it difficult to visually identify changes in color tone. Therefore, if the infrared absorbing textile product of the present invention has particularly high brightness, for example, if L ^* in the CIE 1976 color space exceeds 90, the following requirements (i) to (iv):
(i) a ^* in CIE1976 color space is -10 or less;
(ii) a ^* in the CIE 1976 color space is 10 or more;
It is preferable that at least one of the following conditions be satisfied: (iii) b ^* in the CIE 1976 color space is -10 or less; and (iv) b ^* in the CIE 1976 color space is 10 or more.

On the other hand, when the brightness of the infrared absorbing textile product of the present invention is not particularly high, for example, when L ^* in the CIE 1976 color space is 90 or less, the change in color tone due to the inclusion of the infrared absorbing pigment is There is no particular reason why it is easy to identify visually. Therefore, in this case, the present invention can be suitably applied regardless of the value of a ^* or b ^* .

L ^* , a ^* , and b ^* of a textile product in the CIE 1976 color space can be measured by the method described in Examples below.

The present invention will be explained in detail below.

《Infrared absorbing textile products》
The infrared absorbing fiber product of the present invention is
An infrared absorbing textile product containing an infrared absorbing pigment,
L ^* in CIE1976 color space is 30 or more, and
The color difference ΔE in the CIE 1976 color space between the infrared absorbing textile product and when the infrared absorbing textile product does not contain an infrared absorbing pigment is 10 or less.

The infrared absorbing fiber product of the present invention is
It may be an infrared absorbing textile product that has L ^* in the CIE 1976 color space of more than 90 and satisfies at least one of the following (i) to (iv):
(i) a ^* in CIE1976 color space is -10 or less;
(ii) a ^* in the CIE 1976 color space is 10 or more;
(iii) b ^* in the CIE 1976 color space is -10 or less; and (iv) b ^* in the CIE 1976 color space is 10 or more.

The infrared absorbing fiber product of the present invention, or
L ^* in CIE1976 color space is 90 or less,
It may also be an infrared absorbing textile product.

The color difference ΔE in the CIE 1976 color space between the infrared absorbing textile product and when the infrared absorbing textile product does not contain the infrared absorbing pigment is 10 or less. If the ΔE between the two is 10 or less, it will be difficult to visually identify the change in color tone due to the inclusion of the infrared absorbing pigment in the textile product. The value of ΔE may be 9 or less, 8 or less, 6 or less, 5 or less, or 4 or less. Further, the value of ΔE may be 0 or more, more than 0, 0.5 or more, 1 or more, 2 or more, or 3 or more.

In an infrared absorbing textile product, when L ^* in the CIE 1976 color space is over 90, that is, even when the color tone of the textile product is particularly bright, at least one of the above (i) to (iv) is applied. If the requirements are met, it will be difficult to visually discern changes in color tone due to the inclusion of infrared absorbing pigments in textile products. When L ^* is more than 90, the color difference ΔE may be 5 or less, 4.5 or less, 4 or less, 3.5 or less, or 3 or less, from the viewpoint of making visual identification of color tone changes more difficult. It may be 0 or more, more than 0, 0.1 or more, 0.2 or more, 0.3 or more, 0.4 or more, or 0.5 or more.

However, when L ^* is more than 90, the content of infrared absorbing pigment in the textile product may be limited and the heat generation property may be limited in order to ensure the difficulty of visual identification of color change. be. From this point of view, L ^* in the CIE 1976 color space of the infrared absorbing textile product may be 90 or less.

This L ^* is appropriately set within the above range depending on the desired color tone of the textile product. For example, in the case of a textile product with a red color tone, L ^* is 90 or less, and 80 or less. , 70 or less, 60 or less, or 50 or less. In the case of textile products with yellowish tones, L ^* is 90 or less, and may be 89 or less, 88 or less, 87 or less, or 86 or less. For textile products with blue-based tones, L ^* is 90 or less, and may be 80 or less, 60 or less, or 40 or less.

Even if L ^* is 90 or less, when the color tone of the textile product is relatively bright, for example, when L ^* is greater than 80, in order to ensure the difficulty of visual identification of color tone changes, the color difference ΔE must be It may be 8 or less, 7 or less, 6 or less, or 5 or less. On the other hand, when L ^* is 80 or less and the color difference ΔE is 10 or less, visual identification of color tone changes becomes extremely difficult.

<fiber>
The infrared absorbing textile product of the present invention includes fiber and an infrared absorbing pigment.

The fibers in the infrared absorbing fiber product of the present invention may be, for example, synthetic fibers, semi-synthetic fibers, natural fibers, synthetic fibers, inorganic fibers, etc., or mixed yarns composed of multiple types of these fibers. May be selected. Among these, synthetic fibers are preferred in consideration of the dispersibility of infrared absorbing pigments, the heat retention properties of textile products, and the like.

Examples of the synthetic fibers in the present invention include polyester fibers, polyolefin fibers, acrylic fibers, polyamide fibers, polyether ester fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, and polyvinyl chloride fibers. These may be appropriately selected and used.

The polyester fiber may be, for example, polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, or the like.

The polyolefin fiber may be, for example, polyethylene, polypropylene, polystyrene, or the like.

The acrylic fiber may be, for example, a fiber made of polyacrylonitrile, an acrylonitrile/vinyl chloride copolymer, or the like.

The polyamide fiber may be, for example, a fiber made of nylon, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, aramid, or the like.

The fibers of the invention may have a cross section of any shape. For example, it may be circular, polygonal, flat, hollow, Y-shaped, star-shaped, core-sheath shape, etc.

The fibers of the present invention may be short fibers or long fibers.

<Infrared absorbing pigment>
The infrared absorbing pigment in the infrared absorbing textile product of the present invention has the property of absorbing infrared rays, preferably near infrared rays, and emitting heat, and has a bright color tone, which improves the design of the infrared absorbing textile product of the present invention. It is preferable that the degree of freedom is not excessively impaired.

Examples of such infrared absorbing pigments include:
General formula M _x W _y O _z (1)
{In formula (1), M is H, He, alkali metal element, alkaline earth metal element, rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt , Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo , Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, and x, y, and z are Each is a positive number, 0<x/y≦1, and 2.2≦z/y≦3.0}
Composite tungsten oxide represented by
General formula W _y O _z (2)
{In formula (2), W is tungsten, O is oxygen, y and z are each positive numbers, and 2.45≦z/y≦2.999}
Examples include tungsten oxide having a Magneli phase represented by the following, and one or more selected from these may be appropriately selected and used.

Here, the alkali metal elements are Group 1 elements of the periodic table excluding hydrogen atoms. The alkaline earth metal elements are Group 2 elements of the periodic table excluding Be and Mg. Rare earth elements are Sc, Y, and tanthanoid elements.

The composite tungsten oxide represented by general formula (1) contains element M. Therefore, free electrons are generated and an absorption band derived from the free electrons is expressed in the near-infrared wavelength region, so it is suitable as a material that absorbs near-infrared rays with a wavelength of around 1,000 nm and generates heat.

If the value of x/y indicating the amount of addition of element M exceeds 0, a sufficient amount of free electrons will be generated and a sufficient near-infrared absorption effect can be obtained. As the amount of element M added increases, the amount of free electrons supplied increases and the near-infrared absorption effect also increases, but the value of x/y becomes saturated at about 1. It is preferable that the value of x/y is 1 or less because it is possible to avoid the formation of impurity phases in the fine particle-containing layer. The value of x/y is preferably 0.001 or more, 0.2 or more, or 0.30 or more, and this value is preferably 0.85 or less, 0.5 or less, or 0.35 or less. . The value of x/y is ideally 0.33.

In particular, when the element M in general formula (1) is one or more of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn, the material can be used as a near-infrared absorbing material. It is preferable from the viewpoint of improving optical properties and weather resistance, and it is particularly preferable when M is Cs.

In the case of Cs _x W _y O _z (0.25≦x/y≦0.35, 2.2≦z/Y≦3.0), the lattice constant is 7.4060 Å or more and 7.4082 Å for the a-axis. From the viewpoint of optical properties in the near-infrared region and weather resistance, it is preferable that the c-axis is 7.6106 Å or more and 7.6149 Å or less.

When the composite tungsten oxide represented by the general formula (1) has a hexagonal crystal structure or consists of a hexagonal crystal structure, the transmission of the infrared absorbing material fine particles in the visible wavelength region is improved, Moreover, absorption in the near-infrared wavelength region is improved, which is preferable. When cations of element M are added and present in the voids of the hexagonal crystal, transmission in the visible wavelength region is improved and absorption in the near-infrared wavelength region is improved. Generally, when an element M having a large ionic radius is added, hexagonal crystals are formed. Specifically, when an element with a large ionic radius such as Cs, Rb, K, Tl, In, Ba, Sn, Li, Ca, Sr, or Fe is added, hexagonal crystals are likely to be formed. However, the present invention is not limited to these elements, and any element other than these elements may be used as long as the additive element M is present in the hexagonal void formed by ₆ units of WO.

When the composite tungsten oxide having a hexagonal crystal structure has a uniform crystal structure, the amount of the additive element M added is preferably 0.2 or more and 0.5 or less in x/y value, more preferably 0. It is 30 or more and 0.35 or less, and ideally 0.33. Since the value of x/y is 0.33, it is considered that the additive element M is arranged in all the hexagonal voids.

It is preferable that the composite tungsten oxide represented by the general formula (1) is treated with a silane coupling agent because it has excellent dispersibility, near-infrared absorption, and transparency in the visible wavelength region.

In a tungsten oxide having a Magneli phase represented by the general formula (2), the so-called "Magneli phase" having a composition ratio where the value of z/y satisfies the relationship of 2.45≦z/y≦2.999 is: It is chemically stable and has good absorption characteristics in the near-infrared wavelength region, so it is preferred as a near-infrared absorbing material.

In general formulas (1) and (2), the value of z/y indicates the level of control of the amount of oxygen. The composite tungsten oxide represented by the general formula (1) has a z/y value that satisfies the relationship 2.2≦z/y≦3.0, so the tungsten oxide represented by the general formula (2) In addition to the same oxygen control mechanism working, there is a supply of free electrons due to the addition of element M even in the case of z/y = 3.0. In general formula (1), it is more preferable that the value of z/y satisfies the relationship of 2.45≦z/y≦3.0.

Note that some of the oxygen atoms constituting the composite tungsten oxide and tungsten oxide in the present invention are substituted with halogen atoms, originating from the raw material compound used during the production of the composite tungsten oxide and tungsten oxide. There may be cases. However, this is not a problem in implementing the present invention. Therefore, the composite tungsten oxide and tungsten oxide in the present invention include cases where some of the oxygen atoms are replaced with halogen atoms.

The infrared absorbing pigment of the present invention largely absorbs light in the near-infrared wavelength region, particularly around a wavelength of 1,000 nm, so its transmitted color tone often ranges from blue to green. However, since this color development is pale, the infrared absorbing textile product of the present invention containing the infrared absorbing pigment can provide a desirable design when applied to clothing such as winter clothing.

The content of the infrared absorbing pigment in the infrared absorbing fiber product of the present invention will be described later.

<Infrared absorbing fiber>
The infrared absorbing fiber product of the present invention includes an infrared absorbing fiber.

Therefore, the infrared absorbing fiber of the present invention is
An infrared absorbing fiber containing an infrared absorbing pigment,
L ^* in CIE1976 color space is 30 or more, and
The color difference ΔE in the CIE 1976 color space between the infrared absorbing fiber and when the infrared absorbing fiber does not contain an infrared absorbing pigment is 10 or less.

In this specification, the color tone of a fiber may be measured when the fiber is made into a plain weave or tricot fabric.

The content of the infrared absorbing pigment in the infrared absorbing fiber of the present invention may be 0.01% by mass or more and 0.50% by mass or less, based on the total mass of the infrared absorbing fiber.

In order to achieve comfortable heat generation properties while satisfying the predetermined ΔE requirements of the present invention, the content of the infrared absorbing pigment is preferably 0.01% by mass or more, 0.01% by mass or more, based on the total mass of the infrared absorbing fiber. 05% by mass or more, 0.10% by mass or more, or 0.15% by mass or more, and 0.50% by mass or less, 0.40% by mass or less, 0.30% by mass or less, or 0.20% by mass % or less.

<Method for manufacturing infrared absorbing fiber>
The infrared absorbing fiber of the present invention may be produced by any known appropriate method, or by any suitable modification made thereto by a person skilled in the art.

The infrared absorbing fiber of the present invention is, for example,
(1) A method of directly blending an infrared absorbing pigment into the raw material polymer of synthetic fiber and spinning it;
(2) A masterbatch containing a high concentration of an infrared absorbing pigment is prepared in a raw material polymer for synthetic fibers, and the masterbatch and a diluted polymer containing no infrared absorbing pigment are mixed and spun. Method;
(3) A method of blending an infrared absorbing pigment into a dope solution containing a raw material polymer for synthetic fibers and spinning it;
(4) It may be manufactured by a method such as a method in which an infrared absorbing pigment is attached to at least one of the surface and inside of a fiber that does not contain an infrared absorbing pigment.

The spinning in the above manufacturing methods (1), (2), and (3) may be wet spinning using an appropriate solvent or dry spinning such as melt spinning.

The infrared absorbing fiber of the present invention may contain a coloring agent such as an appropriate pigment or dye in order to develop a desired color tone. This colorant may be added at any point in the manufacturing process of the infrared absorbing fiber.

<Application of infrared absorbing fiber>
The infrared absorbing fibers of the present invention may be used, for example, in infrared absorbing knitted or nonwoven fabrics.

This infrared absorbing knitted fabric or nonwoven fabric may be composed only of the infrared absorbing fiber of the present invention, or may be composed of the infrared absorbing fiber of the present invention and other fibers. Here, the other fibers include an infrared absorbing pigment, but may be fibers that do not satisfy at least one of the L ^* requirements and ΔE requirements specified in the present invention, or fibers that do not include an infrared absorbing pigment. It may be.

However, in order to fulfill the purpose of the present invention, which is to provide a desirable design when applied to clothing, other fibers should be made by removing the infrared absorbing pigment from the infrared absorbing fiber of the present invention. It is preferable to use one having the following.

That is, the infrared absorbing knitted fabric or nonwoven fabric constructed using the infrared absorbing fiber of the present invention is
Preferably, the fiber is composed of only the infrared absorbing fiber of the present invention, or the infrared absorbing fiber of the present invention and a fiber having a structure obtained by removing the infrared absorbing pigment from the infrared absorbing fiber. It is.

It is sufficient that the infrared absorbing fiber of the present invention satisfies both the L ^* requirement and the ΔE requirement prescribed by the present invention, and the infrared absorbing knitted fabric or nonwoven fabric constructed using the infrared absorbing fiber of the present invention is The woven fabric or nonwoven fabric as a whole may satisfy both the L ^* requirements and the ΔE requirements specified in the present invention, or may not satisfy at least one of them.

The infrared absorbing knitted fabric or nonwoven fabric constructed using the infrared absorbing fiber of the present invention is, for example,
It may be a woven fabric such as plain weave, satin weave, or twill;
It may be knits such as chain knitting, top knitting, ridge knitting, long knitting, medium long knitting, plucked knitting, tricot knitting, etc.;
Even if it is a nonwoven fabric manufactured by an appropriate method such as dry method, wet method, spunbond method, melt blow method, thermal bond method, chemical bond method, needle punch method, spunlace method, stitch bond method, steam jet method, etc. good.

<Infrared absorbing knitted fabric or nonwoven fabric>
The infrared absorbing textile products of the present invention include infrared absorbing knitted fabrics or nonwoven fabrics. Hereinafter, knitted fabrics and nonwoven fabrics may be collectively referred to as "knitted fabrics, etc.".

The infrared absorbing knitted fabric of the present invention, etc.
An infrared absorbing knitted fabric etc. containing an infrared absorbing pigment,
L ^* in CIE1976 color space is 30 or more, and
The color difference ΔE in the CIE 1976 color space between the infrared absorbing knitted fabric, etc. and the case where the infrared absorbing knitted fabric, etc. does not contain an infrared absorbing pigment is 10 or less.

The content of the infrared absorbing pigment in the infrared absorbing knitted fabric, etc. of the present invention may be 0.05 g/m 2 or more and 0.50 g/m ^{2 or} less per area of the infrared absorbing knitted fabric, etc.

The content of the infrared absorbing pigment suitable for realizing comfortable heat generation properties while satisfying the predetermined ΔE requirements of the present invention may vary depending on the color tone of the infrared absorbing knitted fabric, etc. In the case of knitted fabrics with bright warm colors, such as red and yellow tones, the L ^* value is relatively large, and changes in color tone caused by the knitted fabrics containing infrared absorbing pigments can be visually discerned. It tends to be easy. Therefore, there is a limit to the upper limit of the content of the infrared absorbing pigment to satisfy the ΔE requirement. In this case, the content per area of the infrared absorbing pigment should be 0.01 g/m ² or more, 0.03 g/m ² or more, 0.05 g/m ² or more, in order to achieve comfortable heat generation properties. It may be greater than or equal to 0.06 g/ ^m2 , greater than or equal to 0.08 g/ ^m2 , greater than or equal to 0.10 g/ ^m2 , or ^greater than or equal to 0.12 g/m2; It may be less than or equal to .50 g/ ^m2 , less than or equal to 0.40 g/ ^m2 , less than or equal to 0.30 g/ ^m2 , less than or equal to 0.25 g/ ^m2 , or less than or equal to 0.20 g/ ^m2 .

When the color tone is particularly bright, for example, when the L ^* value is more than 80 or more than 90, the content per area of the infrared absorbing pigment should be 0.0. May be 30 g/m ² or less, 0.25 g/m ² or less, 0.20 g/m ² or less, 0.15 g/m ² or less, 0.12 g/m ² or less, or 0.10 g/m ² or less .

On the other hand, in the case of knitted fabrics with dark, cool tones, for example, bluish tones, the L ^* value is relatively small, and changes in color tone due to the knitted fabrics containing infrared absorbing pigments can be visually discerned. It tends to be difficult. Therefore, even if it contains a relatively large amount of infrared absorbing pigment, it tends to easily satisfy the ΔE requirement. In this case, in order to achieve comfortable heat generation properties, the temperature must be 0.05 g/m ² or more, 0.06 g/m ² or more, 0.08 g/m ² or more, 0.10 g/m ² or more, or 0.12 g /m ² or more, and to ensure fulfillment of the ΔE requirements, 0.50 g/m ² or less, 0.48 g/m ² or less, 0.46 g/m ² or less, 0.44 g/m 2 ² or less, 0.42 g/m ² or less, or 0.40 g/m ² or less.

<Composition of infrared absorbing knitted fabric, etc.>
The infrared absorbing knitted fabric etc. of the present invention may be composed only of infrared absorbing fibers containing an infrared absorbing pigment, or may be composed of infrared absorbing fibers containing an infrared absorbing pigment and an infrared absorbing pigment. It may also be composed of fibers that do not contain fibers. Here, the fiber that does not contain an infrared absorbing pigment may have a structure in which the infrared absorbing pigment is removed from an infrared absorbing fiber, or it may be made of a different material. .

However, in order to fulfill the purpose of the present invention, which is to provide a desirable design when applied to clothing, it is necessary to remove the infrared absorbing pigment from the infrared absorbing fiber as the fiber that does not contain the infrared absorbing pigment. It is preferable to use one having a similar configuration.

That is, the infrared absorbing knitted fabric etc. of the present invention,
Consisting only of infrared absorbing fibers containing infrared absorbing pigments, or consisting of infrared absorbing fibers containing infrared absorbing pigments and fibers having the composition of the infrared absorbing fibers excluding the infrared absorbing pigments. It is preferable that the

The infrared absorbing knitted fabric, etc. of the present invention only needs to satisfy both the L ^* requirement and the ΔE requirement prescribed by the present invention as a whole, and the fibers constituting the infrared absorbing knitted fabric, etc. Both the L ^* requirement and the ΔE requirement prescribed in the present invention may be satisfied, or at least one of them may not be satisfied.

The infrared absorbing knitted fabric etc. of the present invention is constructed using the above-mentioned fibers, and includes, for example,
It may be a woven fabric such as plain weave, satin weave, or twill;
It may be knits such as chain knitting, top knitting, ridge knitting, long knitting, medium long knitting, plucked knitting, tricot knitting, etc.;
Fleece forming methods (e.g. dry method, wet method, spun bond method, melt blow method, etc.), fleece bonding methods (e.g. thermal bond method, chemical bond method, needle punch method, spunlace method, stitch bond method, steam jet method) etc.) or the like may be used.

<Method for manufacturing infrared absorbing knitted fabric>
The infrared absorbing knitted fabric of the present invention may be manufactured by any known appropriate method or by a method with appropriate modifications made by a person skilled in the art.

The infrared absorbing knitted fabric of the present invention includes, for example,
(1) A method for obtaining a knitted fabric by knitting an infrared absorbing fiber;
(2) A method of obtaining a textile by weaving infrared absorbing fibers, or infrared absorbing fibers and fibers that do not contain infrared absorbing pigments;
(3) A method of obtaining a nonwoven fabric using an infrared absorbing fiber, or an infrared absorbing fiber and a fiber that does not contain an infrared absorbing pigment, by an appropriate method such as a fleece forming method or a fleece bonding method;
(4) A method of applying a coating liquid containing an infrared absorbing pigment to a knitted fabric etc. that does not contain an infrared absorbing pigment;
It may be manufactured by a method such as

The coating liquid used in the method (4) may contain, for example, an infrared absorbing pigment and a suitable solvent, and if necessary, improve the adhesion between the infrared absorbing pigment and the knitted fabric, etc. In order to do this, a binder polymer or the like may be further included.

The infrared absorbing knitted fabric of the present invention may contain a coloring agent such as an appropriate pigment or dye in order to develop a desired color tone. The colorant may be applied at any point in the manufacturing process of the infrared absorbing textile or the like. In particular, in the method (3) using a coating liquid, a coloring agent may be included in the coating liquid.

《Infrared absorbing clothing》
The invention further provides an infrared absorbing garment.

The infrared absorbing clothing of the present invention may include an infrared absorbing knitted fabric made of the infrared absorbing fiber of the present invention, and an infrared absorbing knitted fabric of the present invention.

The infrared absorbing clothing of the present invention may be composed only of the above-mentioned infrared absorbing knitted fabric, etc., or may be composed of an infrared absorbing knitted fabric, etc. and a knitted fabric, etc. that does not contain an infrared absorbing pigment. may have been done.

A knitted fabric etc. that does not contain an infrared absorbing pigment may have a structure in which the infrared absorbing pigment is removed from an infrared absorbing knitted fabric etc., or it may be made of a different material. good.

However, in order to fulfill the purpose of the present invention, which is to provide a desirable design, knitted fabrics, etc. that do not contain infrared absorbing pigments have a structure in which the infrared absorbing pigments are removed from infrared absorbing knitted fabrics, etc. It is preferable to use

That is, the infrared absorbing clothing of the present invention is
Consisting only of an infrared absorbing knitted fabric, etc. containing an infrared absorbing pigment, or a composition consisting of an infrared absorbing knitted fabric, etc. containing an infrared absorbing pigment and the infrared absorbing knitted fabric, etc. excluding the infrared absorbing pigment. It is preferable that the material is made of a knitted fabric or the like having the following properties.

The infrared absorbing clothing of the present invention may be manufactured by a known method using the above-mentioned knitted fabric or the like.

1. Infrared absorbing knitted fabric In the following examples and comparative examples, the following raw materials were used for sample preparation.

<Infrared absorbing pigment>
(cesium tungsten oxide)
Manufactured by Sumitomo Metal Mining Co., Ltd., "YMS-01A-2", a dispersion containing Cs _0.33 WO ₃ 25% by weight, and propylene glycol monomethyl ether acetate as a solvent

Hereinafter, the above infrared absorbing pigment Cs _0.33 WO ₃ will be referred to as "CsWO", and the dispersion containing the CsWO and solvent will be referred to as "CsWO dispersion".

(antimony doped tin oxide)
Manufactured by Ishihara Sangyo Co., Ltd., "ATO", solid content 100% by weight

(Carbon black)
Manufactured by CABOT, furnace black "R400R", solid content 100% by weight

<Binder polymer>
Manufactured by Dainichiseika Kagyo Co., Ltd., urethane resin solution "Lezamin ME-44ELPNS", solid content 30% by weight

<Color ink>
Red: Seiko Advance Co., Ltd., "MRJ RX02 510 American Red", solid content 37% by weight
Yellow: Seiko Advance Co., Ltd., "MRJ RX02 NC200 Primrose Yellow", solid content 37% by weight
Blue: Seiko Advance Co., Ltd., "MRJ RX02 440 Blue", solid content 37% by weight
White: Seiko Advance Co., Ltd., "MRJ RX02 120 White", solid content 64% by weight

《Comparative example r1》
(1) Preparation of ink 10.0 parts by weight of red ink (equivalent to 3.70 parts by weight of solid content), 54.0 parts by weight of urethane resin solution (equivalent to 16.20 parts by weight of solid content), and 36 parts by weight of methyl ethyl ketone (MEK). 0 parts by weight were mixed to prepare 100 parts by weight of a red base ink having a red ink content of 10% by weight (wet/wet) and a solids content of 19.9% by weight.

(2) Coating Using a Baker applicator, the ink obtained above was applied to a white fabric made of 100% polyester (334 μm thick fabric, L ^* ) under the conditions of a wet film thickness of 200 μm and a coating speed of 5.2 m/min. 93.6, a ^* 1.9, b ^* -8.7). A reference fabric sample was then prepared by leaving it at 100° C. for 1 minute to remove the solvent.

(3) Evaluation (3-1) Evaluation of light-generating property Eye lamp for lighting manufactured by Iwasaki Electric Co., Ltd. (model name "PRF250", rated voltage 100 V, rated power consumption 250 W, color temperature 3,200 K, diffused type) was placed at a position 30 cm away from a textile sample cut out into a square of 7 cm x 7 cm, and irradiated with light. At this time, the temperature of the back surface of the fabric (temperature of the surface opposite to the light irradiation side) before light irradiation (0 minutes after) and after 5 minutes of light irradiation was measured, and from the difference between the two, the photoheat generation of the fabric sample was determined. The gender was calculated.

The photothermal value of the textile sample obtained here was used as a standard for calculating the photothermal effect of the infrared absorbing pigment in Examples R1 and R2 and Comparative Example r2.

(3-2) Evaluation of color tone Using a spectrophotometer manufactured by X-Rite, model name "SpectroEye", L ^* , a ^* , and b in the CIE 1976 color space were measured for the fabric sample obtained above. ^* was measured. The measurement was performed with three white mounts (L ^* = 94.84, a ^* = 0.03, b ^* = 0.44, thickness 0.24 mm) stacked and placed under the fabric sample.

The values of L ^* , a ^* , and b ^* of the fabric samples obtained here were used as standards for calculating the color difference ΔE in Examples R1 and R2 and Comparative Example r2.

In addition, the fabric samples obtained here were used as standards for sensory evaluation of color difference in Examples R1 and R2 and Comparative Example r2.

《Example R1》
(1) Preparation of ink By adding 0.12 parts by weight of CsWO dispersion (equivalent to 0.030 parts by weight of CsWO) to 100 parts by weight of the red base ink prepared in the same manner as Comparative Example r1, the red ink content was 10% by weight. (wet/wet), an infrared absorbing red ink with a CsWO content of 0.15% by weight per ink solid content was prepared.

(2) Coating A fabric sample was prepared by coating a 100% polyester white fabric (fabric) in the same manner as Comparative Example r1 except that the infrared absorbing red ink obtained above was used. Here, the dry weight of the coated ink is calculated from the difference in weight between the fabric sample before coating and the fabric sample after coating, and from the amount of infrared absorbing pigment contained in this and the area of the coated surface. , the content of infrared absorbing pigment per unit area of the textile sample was calculated.

(3) Evaluation (3-1) Evaluation of photogenerating effect Using the obtained fabric sample of Example R1, the photogenerating property and color tone were evaluated in the same manner as Comparative Example r1. The photothermal effect of the infrared absorbing pigment in the textile sample of Example R1 was calculated by subtracting the photothermal value of the textile sample of Comparative Example R1 from the photothermal value of the textile sample.

(3-2) Evaluation of color difference ΔE From the values of L ^* , a ^* , and b ^* of the textile sample and the values of L ^* , a ^* , and b ^* of the standard textile sample of comparative example r1, Example The color difference ΔE between the fabric sample of R1 and the reference of Comparative Example r1 was calculated.

(3-3) Sensory evaluation of color difference This test was carried out on a stack of three white mounts (L ^* = 94.84, a ^* = 0.03, b ^* = 0.44, thickness 0.24 mm). The fabric sample obtained in Example and the reference fabric sample obtained in Comparative Example r1 were placed side by side, and under daylight fluorescent light irradiation, it was determined whether the difference in color tone between the two samples could be visually discerned. Examined. The test was conducted by six testers and evaluated based on the following criteria.
A: If no test person was able to distinguish the difference in color tone between the two samples (no test person) (good)
B: When only one or two testers were able to distinguish the difference in color tone between both samples (acceptable)
C: When three or more testers were able to distinguish the difference in color tone between both samples (defective)

《Example R2 and Comparative Example r2》
An infrared absorbing red ink was prepared in the same manner as in Example R1, except that the amount of CsWO dispersion added to 100 parts by weight of the red base ink was as shown in Table 1. It was applied to fabric and evaluated.

《Comparative example r3》
The same procedure was used as Comparative Example r1, except that the amounts of the urethane resin solution, red ink, and MEK used were as shown in Table 1, respectively, with a red ink content of 30% by weight (wet/wet) and a solid content. A red base ink with a content of 21.6% by weight was prepared, and was used to coat fabrics and perform evaluation.

The photothermal properties of the textile samples obtained here and the values of L ^* , a ^* , and b ^* are based on the photothermal effect of the infrared absorbing pigment in Examples R3 and R4 and Comparative Example r4, and the color difference ΔE calculation. It was used as a standard.

In addition, the fabric samples obtained here were used as standards for sensory evaluation of color difference in Examples R3 and R4 and Comparative Example r4.

《Example R3》
(1) Preparation of ink By adding 0.13 parts by weight of CsWO dispersion liquid (equivalent to 0.03 parts by weight of CsWO) to 100 parts by weight of the red base ink prepared in the same manner as in Comparative Example r3, the red ink content was 30% by weight. (wet/wet), an infrared absorbing red ink with a CsWO content of 0.15% by weight per ink solid content was prepared, and was used to coat fabrics and perform evaluation.

《Example R4 and Comparative Example r4》
As the red base ink, 100 parts by weight of the red base ink prepared in the same manner as Comparative Example R3 was used, and the amount of the CsWO dispersion liquid added to the 100 parts by weight of the red base ink was as shown in Table 1. Otherwise, an infrared absorbing red ink was prepared in the same manner as in Example R3, and this was used to coat and evaluate fabrics.

The above results are shown in Table 2.

<<Comparative example y1, Examples Y1 and Y2, Comparative examples y2 and y3, Examples Y3 and Y4, and Comparative example y4>>
Yellow ink was prepared in the same manner as Comparative Example r1, Examples R1 and R2, Comparative Examples r2 and r3, Examples R3 and R4, and Comparative Example R4, except that the same amount of yellow ink was used instead of red ink. Base inks (Comparative Examples y1 and y3) and infrared absorbing yellow inks (Examples Y1 to Y4 and Comparative Examples y2 and y4) were prepared and used to coat fabrics and evaluate.

The photothermal properties and the values of L ^* , a ^* , and b ^* of the textile sample obtained in Comparative Example y1 are based on the photothermal effect of the infrared absorbing pigment in Examples Y1 and Y2 and Comparative Example y2, and the color difference. This was used as a standard for calculating ΔE. Further, the textile sample obtained in Comparative Example y1 was used as a standard for sensory evaluation of color difference in Examples Y1 and Y2 and Comparative Example y2.

The photothermal properties and the values of L ^* , a ^* , and b ^* of the textile sample obtained in Comparative Example y3 are based on the photothermal effect of the infrared absorbing pigment in Examples Y3 and Y4 and Comparative Example y4, and the color difference. This was used as a standard for calculating ΔE. Further, the textile sample obtained in Comparative Example y3 was used as a standard for sensory evaluation of color difference in Examples Y3 and Y4 and Comparative Example y4.

Table 3 shows the ink formulations of the above Examples and Comparative Examples. Furthermore, Table 4 shows the evaluation results of the photothermal effect and color tone (L ^* , a ^* , and b ^* , and color difference ΔE) for these.

<<Comparative example b1 and Examples B1 to B4>>
A blue base ink (Comparative Example b1) and an infrared absorbing ink were prepared in the same manner as Comparative Example r1, Examples R1 and R2, and Comparative Example R2, except that the same amount of blue ink was used instead of the red ink. Blue inks (Examples B1 to B4) were prepared and used to coat fabrics and evaluate.

The photothermal properties of the textile sample obtained in Comparative Example b1 and the values of L ^* , a ^* , and b ^* were used as standards for calculating the photothermal effect and color difference ΔE of the infrared absorbing pigments in Examples B1 to B4. Using. Further, the fabric sample obtained in Comparative Example b1 was used as a standard for sensory evaluation of color difference in Examples B1 to B4.

Table 5 shows the ink formulations of the above Examples and Comparative Examples. Furthermore, Table 6 shows the evaluation results of the photothermal effect and color tone (L ^* , a ^* , and b ^* , and color difference ΔE) for these.

《Example R5》
0.24 parts by weight of antimony-doped tin oxide (manufactured by Ishihara Sangyo Co., Ltd., "ATO", solid content 100% by weight) was added as an infrared absorbing pigment to 100 parts by weight of the red base ink prepared in the same manner as Comparative Example r1. By adding, an infrared absorbing red ink having a red ink content of 10% by weight (wet/wet) and an ATO content of 1.19% by weight per ink solid content was prepared. Coating to fabric and evaluation were performed in the same manner as above.

《Comparative example r5》
0.03 parts by weight of carbon black (CB) (manufactured by CABOT, Furnace Black "R400R", solid content 100% by weight) as an infrared absorbing pigment was added to 100 parts by weight of the red base ink prepared in the same manner as in Comparative Example r1. By adding, an infrared absorbing red ink with a red ink content of 10% by weight (wet/wet) and a CB content of 0.15% by weight per ink solid content was prepared, and except for using this, Example R1 Coating to fabric and evaluation were performed in the same manner as above.

In the evaluation of these Examples and Comparative Examples, the fabric sample obtained in Comparative Example r1 was used as the fabric sample that served as the standard for photothermia, color difference ΔE, and sensory evaluation.

The formulations of the inks of the above examples and comparative examples are shown in Table 7, along with the formulation of comparative example r1. Furthermore, the evaluation results of the photothermal effect and color tone (L ^* , a ^* , and b ^* , and color difference ΔE) of these are shown in Table 8 together with the evaluation results of Comparative Example r1.

《Comparative Examples p1 to p3 and Examples P1 to P3》
Each color base ink (Comparative Example p1 to p3) and infrared absorbing inks of various colors (Examples P1 to P3) were prepared and used to coat fabrics and evaluate.

In these evaluations, the fabric samples used as standards for photothermal properties, color difference ΔE, and sensory evaluation were the sample of Comparative Example p1 for the sample of Example P1, and the sample of Comparative Example p2 for the sample of Example P2. For the sample of Example P3, the sample of Comparative Example p3 was used. The results obtained are shown in Table 10.

2. Infrared Absorbing Fibers In the Examples and Comparative Examples below, tests were conducted on tricots or fabrics made using infrared absorbing fibers containing infrared absorbing pigments. Using cesium tungsten oxide CsWO as an infrared absorbing pigment, polyethylene terephthalate (PET)-based infrared absorbing fibers were prepared and tested with two levels of content: 0.11% by weight and 0.52% by weight. I did it.

In the following Examples and Comparative Examples, the following raw materials were used for sample preparation.

<Infrared absorbing pigment>
(cesium tungsten oxide)
Manufactured by Sumitomo Metal Mining Co., Ltd., "YMDS-874", dispersion powder containing 23% by weight of Cs _0.33 WO ₃ and a dispersant

Hereinafter, the above infrared absorbing pigment Cs _0.33 WO ₃ will be referred to as "CsWO", and the dispersed powder containing the CsWO and a dispersant will be referred to as "CsWO dispersed powder".

<Base resin>
Manufactured by Bell Polyester Products Co., Ltd., "Belpet IP121B", copolymer type polyethylene terephthalate containing isophthalic acid as the third component, intrinsic viscosity = 0.62

<Preparation of CsWO masterbatch>
In a twin-screw extruder, 95 parts by weight of the base resin and 5 parts by weight of the CsWO dispersed powder (equivalent to 1.15 parts by weight of CsWO) were kneaded to obtain a CsWO masterbatch containing 1.15 parts by weight of CsWO.

《Comparative example t1》
(1) Spinning Using a multifilament melt spinning device, homo-PET was used as the spinning raw material, and by spinning for 1 hour at a spinning temperature of 290°C, an extrusion rate of 4 kg/h, and a take-up speed of 1,500 m/min, 50 A multifilament fiber with a denier of 24 filaments was obtained.

(2) Fabric Preparation Using 80% by weight of the multifilament fibers and 20% by weight of polyurethane fibers, a tricot fabric with a gauge of 32 and a basis weight of 240 g/m ² was produced using a knitting machine.

(3) Evaluation (3-1) Evaluation of light-generating property Eye lamp for lighting manufactured by Iwasaki Electric Co., Ltd. (model name "PRF250", rated voltage 100 V, rated power consumption 250 W, color temperature 3,200 K, diffused type) was placed at a position 30 cm away from a tricot fabric sample cut into a 7 cm x 7 cm square, and irradiated with light. At this time, the surface temperature of the tricot fabric before light irradiation (0 minutes later) and after 5 minutes of light irradiation was measured, and the photothermal property of the tricot fabric sample was calculated from the difference between the two.

The photothermal value of the tricot fabric sample obtained here was used as a standard for calculating the photothermal effect of the infrared absorbing pigment in Example T1 and Comparative Example t2.

(3-2) Evaluation of color tone Using a spectrophotometer manufactured by X-Rite, model name "Spectro Eye", the tricot fabric sample obtained above was evaluated for L ^* , a ^* , and in the CIE1976 color space. b ^* was measured. The measurements were performed with three sheets of white mount (L ^* = 94.84, a ^* = 0.03, b ^* = 0.44, thickness 0.24 mm) placed under the tricot fabric sample. .

The values of L ^* , a ^* , and b ^* of the tricot fabric sample obtained here were used as a reference for calculating the color difference ΔE in Example T1 and Comparative Example t2.

《Example T1》
(1) Spinning Infrared absorbing multifilament containing 0.11% by weight of CsWO in the same manner as Comparative Example t1 except that 9.57 parts by weight of CsWO masterbatch and 90.43 parts by weight of homo-PET were used as spinning raw materials. Obtained fiber.

(2) Fabric Preparation An infrared absorbing tricot fabric was produced in the same manner as Comparative Example t1, except that 80% by weight of the above infrared absorbing multifilament fibers and 20% by weight of polyurethane fibers were used. The CsWO content of this infrared absorbing tricot fabric was 0.19 g/m ² .

(3) Evaluation Using the obtained infrared absorbing tricot fabric, evaluation was performed in the same manner as in Comparative Example t1.

《Comparative example t2》
An infrared absorbing multifilament fiber containing 0.52% by weight of CsWO was obtained in the same manner as in Comparative Example t1, except that 45.25 parts by weight of CsWO masterbatch and 54.75 parts by weight of homo-PET were used as spinning raw materials. . Using the obtained infrared absorbing multifilament fibers, an infrared absorbing tricot fabric was produced and evaluated in the same manner as in Example T1.

Table 11 shows the evaluation results of the photothermal effect and color tone (L ^* , a ^* , and b ^* , and color difference ΔE) for the above Examples and Comparative Examples.

《Comparative example c1》
(1) Spinning Using a multifilament melt spinning device, homo-PET was used as the spinning raw material, and spinning was performed for 1 hour at a spinning temperature of 290°C, an extrusion rate of 4 kg/h, and a take-up speed of 1,500 m/min. A multifilament fiber of 24 filaments was obtained. By twisting two of these multifilament fibers together, a double yarn equivalent to 150 denier was obtained.

(2) Fabric production The obtained twin yarns are used as wefts, polyester/wool blended yarn (250 denier) with a weight ratio of 50:50 is used as warps, and the weft:warp usage ratio is 41:59 by weight. By performing 3/1 twill weaving using a loom, a fabric having a basis weight of 170 g/m ² was obtained.

(3) Evaluation The fabric obtained here is a woven fabric using a 3/1 twill weave, so the warp surface has a large amount of exposed polyester/wool blend yarn as the warp, and the weft surface has a large amount of exposed double yarn as the weft. The two sides are two sides of the same coin. Therefore, the evaluation of the heat generation property and the color tone of the fabric samples were performed on both the warp and weft surfaces, respectively.

(3-1) Evaluation of light-generating property An eye lamp for lighting manufactured by Iwasaki Electric Co., Ltd. (model name "PRF250", rated voltage 100 V, rated power consumption 250 W, color temperature 3,200 K, diffused light type) was placed at 7 cm x It was placed 30 cm away from a textile sample cut out into a 7 cm square, and irradiated with light. At this time, the back surface temperature of the fabric was measured before light irradiation (0 minutes later) and after 5 minutes of light irradiation, and the photothermal property of the fabric sample was calculated from the difference between the two.

The photothermal value of the fabric sample obtained here was used as a standard for calculating the photothermal effect of the infrared absorbing fabric in Example C1 and Comparative Example C2 for the warp and weft surfaces, respectively.

(3-2) Evaluation of color tone Using a spectrophotometer manufactured by X-Rite, model name "SpectroEye", L ^* , a ^* , and b in the CIE 1976 color space were measured for the fabric sample obtained above. ^* was measured. The measurement was performed with three white mounts (L ^* = 94.84, a ^* = 0.03, b ^* = 0.44, thickness 0.24 mm) stacked and placed under the fabric sample.

The values of L ^* , a ^* , and b ^* of the fabric samples obtained here were used as standards for calculating the color difference ΔE in Example C1 and Comparative Example c2 for the warp and weft surfaces, respectively.

《Example C1》
(1) Spinning A 75-denier 24 filament containing 0.11% by weight of CsWO was prepared in the same manner as in Comparative Example c1, except that 9.57 parts by weight of CsWO masterbatch and 90.43 parts by weight of homo-PET were used as spinning raw materials. An infrared absorbing multifilament fiber was obtained. By twisting two of these infrared absorbing multifilament fibers, an infrared absorbing twin yarn equivalent to 150 denier was obtained.

(2) Fabric production An infrared absorbing fabric with a basis weight of 170 g/m ² was obtained in the same manner as Comparative Example c1, except that the infrared absorbing twin yarn obtained above was used as the weft. The CsWO content of this infrared absorbing fabric was 0.08 g/m ² .

(3) Evaluation The obtained infrared absorbing fabric was evaluated in the same manner as in Comparative Example c1.

《Comparative example c2》
An infrared absorbing multifilament fiber containing 0.52% by weight of CsWO was obtained in the same manner as in Comparative Example c1, except that 45.25 parts by weight of CsWO masterbatch and 54.75 parts by weight of homo-PET were used as spinning raw materials. . An infrared absorbing twin yarn was produced in the same manner as in Example C1, except that the obtained infrared absorbing multifilament fiber was used, and an infrared absorbing fabric with a basis weight of 170 g/m ² was obtained using this. The CsWO content of this infrared absorbing fabric was 0.35 g/m ² .

This infrared absorbing fabric was evaluated in the same manner as Comparative Example c1.

Table 12 shows the evaluation results of the photothermal effect and color tone (L ^* , a ^* , and b ^* , and color difference ΔE) for the above Examples and Comparative Examples.

Claims (10)

An infrared absorbing knitted fabric or nonwoven fabric containing an infrared absorbing pigment,
The infrared absorbing pigment is
General formula M _x W _y O _z (1)
{In formula (1), M is H, He, alkali metal element, alkaline earth metal element, rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt , Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo , Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, and x, y, and z are Each is a positive number, 0<x/y≦1, and 2.2≦z/y≦3.0}
Composite tungsten oxide represented by and general formula W _y O _z (2)
{In formula (2), W is tungsten, O is oxygen, y and z are each positive numbers, and 2.45≦z/y≦2.999}
Containing one or more selected from the group consisting of tungsten oxides having a Magnelli phase represented by
The content of the infrared absorbing pigment is 0.05 g/m 2 or more and 0.5 g/m ² or ^less per area of the infrared absorbing knitted fabric or nonwoven fabric,
L ^* in CIE1976 color space is 30 or more, and
The color difference ΔE in the CIE 1976 color space between the infrared absorbing knitted fabric or nonwoven fabric and the case where the infrared absorbing knitted fabric or nonwoven fabric does not contain the infrared absorbing pigment is 10 or less.
Infrared absorbing knitted fabric or nonwoven fabric. The infrared absorbing knitted fabric according to claim 1, wherein the content of the infrared absorbing pigment is 0.05 g/m ² or more and 0.21 g/m ² or less per area of the infrared absorbing knitted fabric or nonwoven fabric. , or non-woven fabric. The infrared absorbing knitted fabric or nonwoven fabric according to claim 1 or 2, wherein the L ^* in CIE 1976 color space is greater than 90 and satisfies at least one of the following (i) to (iv):
(i) a ^* in CIE1976 color space is -10 or less;
(ii) a ^* in the CIE 1976 color space is 10 or more;
(iii) b ^* in the CIE 1976 color space is -10 or less; and (iv) b ^* in the CIE 1976 color space is 10 or more. The infrared absorbing knitted fabric or nonwoven fabric according to claim 1 or 2, wherein the L ^* in CIE1976 color space is 90 or less. The infrared absorbing knitted fabric or nonwoven fabric according to any one of claims 1 to 4, which is composed of an infrared absorbing fiber containing the infrared absorbing pigment. It is composed of an infrared absorbing fiber containing the infrared absorbing pigment and a fiber not containing the infrared absorbing pigment,
The fiber that does not contain the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing fiber.
The infrared absorbing knitted fabric or nonwoven fabric according to any one of claims 1 to 4. The infrared absorbing knitted fabric or nonwoven fabric according to any one of claims 1 to 6, which is used for cold weather clothing. An infrared absorbing garment comprising the infrared absorbing knitted fabric or nonwoven fabric according to any one of claims 5 to 7. Consisting of the infrared absorbing knitted fabric or nonwoven fabric according to any one of claims 5 to 7, and the knitted fabric or nonwoven fabric containing no infrared absorbing pigment,
The knitted fabric or nonwoven fabric that does not contain the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing knitted fabric or nonwoven fabric.
Infrared absorbing clothing. The infrared absorbing clothing according to claim 8 or 9, which is cold protection clothing.