JPH03137274A - Heat insulating material - Google Patents

Abstract

PURPOSE:To obtain the subject material highly functional as winter clothes by successively laminating a substrate layer composed of a fiber structure using specific sheath-core type conjugate fiber, synthetic resin film layer containing specific inorganic compound particles and moisture-permeable topcoat layer. CONSTITUTION:A heat insulating material, obtained by successively laminating (A) a substrate layer composed of a fiber structure using sheath-core type conjugate fiber having a polymer (preferred example; polyamide-based polymer) containing particles of an inorganic compound selected from alumina, zirconia, magnesia and titanium oxide arranged in the core part, (B) a synthetic resin film layer containing particles of an inorganic compound selected from alumina, zirconia, magnesia, titanium oxide, carbide-based ceramics and nitride-based ceramics and (C) a topcoat layer (e.g. polyurethane and/or polyglutamate compound) with moisture permeability, having high color fastness to rubbing excellent in endothermic effects and suitable as clothes.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a heat-retaining material suitable for use in clothing and the like.

(Prior Art) Conventionally, heat-retaining fabrics mainly used for sports clothing have been woven or knitted fabrics coated with polyurethane or acrylic resin, or laminated with a resin film. Also, recently, special public service No. 60-47954
Moisture permeable waterproof fabrics using wet porous membranes proposed in Japanese Patent Publication No. 6047955 are also known. Further, JP-A-584-873 and JP-A-59-100775 disclose a method of forming a polyurethane film containing SiO□ porous particles on a fabric.

These have both moisture permeability and waterproof properties. Furthermore, products in which a fibrillated tetrafluoroethylene film is applied to a fabric are also used. All of these have an insulation/IA function in addition to the function as a moisture-permeable waterproof fabric. However, these are heat retaining properties in the passive sense of preventing body heat from escaping into the outside air.

Also known are methods in which aluminum is dispersed in coating resin to prevent body heat from radiating into the outside air, and products in which far-infrared radioactive substances such as zirconium carbide are dispersed in coating resin.

(JP-A-63-35887, JP-A-646857)
(Japanese Unexamined Patent Publication No. 63-14.5894) On the other hand, JP-A No. 63-92720 and the like disclose fibers containing far-infrared emitting substances.

(Problems to be Solved by the Invention) However, although the above-mentioned conventional techniques in which various coatings are applied have some degree of far-infrared radiation effect, they not only lack practical heat retention effects, but also have aesthetic problems. Problematic items are also found here and there. Further, although far-infrared emitting fibers have a heat-retaining effect, it is difficult to say that the effect is sufficient.

An object of the present invention is to provide a new fiber material for cold-weather clothing that has excellent heat retention properties when worn and is comfortable and efficiently absorbs heat from a heat source.

(Means for Solving the Problems) The present invention provides a fiber using a core-sheath composite fiber in which a polymer containing particles of an inorganic compound selected from the group of alumina, zirconia, magnesia, and titanium oxide is disposed in the core. Base material layer consisting of a structure, alumina, zirconia, magnesia,
It is a heat-retaining material made by sequentially laminating a synthetic resin film layer containing particles of an inorganic compound selected from the group of titanium oxide, carbide ceramics, and nitride ceramics, and a moisture-permeable top coat layer.

The core-sheath type composite fiber used in the present invention can be made of polyamide, polyester, polyacrylonitrile, polyethylene, etc., but polyamide is preferable from the viewpoint of heat resistance and sublimation property of dye transfer to the synthetic resin film layer. .

Particles that emit far infrared rays are placed in the core. The reason for this is that substances that emit far-infrared rays generally have high hardness, and if these particles are exposed on the fiber surface, metal parts of spinning machines, drawing machines, knitting machines, looms, etc. that come into contact with the thread during the fiber manufacturing process In order to avoid problems during the manufacturing process, these particles are placed in the core and a part that does not contain particles is placed in the sheath. It is.

Particles that emit far infrared rays generally include oxide ceramics, non-oxidation ceramics, nonmetals, metals,
Examples include alloys and crystals. For example, oxide ceramics include alumina (An203), magnesia (
MgO> type, zirconia (ZrO7) type, titanium oxide (T i 02 ), silicon dioxide (Sing)
, chromium oxide (Cr20.) ferrite (FeO2F
e304) Spinel (MgO-A7!203) Cerium (CaC2) Barium (B a C), etc.
As carbide ceramics, boron carbide (B4C
), titanium carbide (T i C), silicon carbide (S i
C), molybdenum carbide (MoC), tungsten carbide (WC), etc., and nitride ceramics include boron nitride (BN), aluminum nitride (AnN),
There are silicon nitride (S13N4), zirconium nitride (ZrN), etc. Nonmetals include carbon (C), graphite, and metals include tungsten (W> molybdenum (Mo), vanadium (V), platinum (Pt), tantalum ( Ta), manganese (M n ), nickel (
Ni) Copper oxide (Cu20) and iron oxide (Fe20.l) are available; alloys include nichrome, kanthal, stainless steel, and alumel; crystals include mica, fluorite, calcite, nameplate, and quartz.

Among these, inorganic substances having particularly useful properties include alumina-based, zirconia-based, magnesia-based, and titanium oxide-based inorganic substances, and these are used in the core-sheath type composite fiber used in the present invention. Alumina-based products include alumina and mullite, and zirconia-based products include zirconside (ZrOz ・5iO
z) Zircon (Zi()z) etc. are particularly effective,
It is also useful to use a mixture of these. For example, a combination of zirconia (ZiO□) and chromium oxide (CrO2) or a combination of alumina (Aβ203) and magnesia (MgO) is also useful.

In particular, as the inorganic substance blended into the core of the composite fiber, colorless or white ceramics or ceramics with a hue close to white are desirable from the viewpoint of color development and aesthetic effects of dyeing.

Therefore, alumina is most suitable from the viewpoint of heat retention effect and aesthetic effect.

The average particle diameter of the inorganic substance contained in the core of these composite fibers is preferably 0.2 to 1.5 μm. If it is 1.5 μm or more, the dispersibility will be poor and production will be hindered;
When the particle size is less than μm, particles tend to aggregate, which is often inconvenient. The content of the inorganic substance is preferably 10 to 80% by weight, and 20 to 7% by weight based on the core component polymer of the composite fiber.
Particularly preferred is 0% by weight. Inorganic substances are placed in the core,
A small amount, for example, 10% by weight or less, may be added to the sheath.

In addition, if a part or all of the sheath is melted and removed after the sheath is formed from an easily soluble polymer and the composite fiber is made into a fiber structure, the inorganic substance in the core is exposed and gets closer to the surface. preferable.

The thickness of the sheath portion of the composite fiber is preferably 10 μm or less, preferably 7 μm or less.

FIGS. 5 to 11 are explanatory diagrams showing specific examples of cross sections of the composite fiber of the present invention. In the figure, 1 indicates the core of the far-infrared emitting layer, and 2 does not indicate the sheath. Since the polymer of the sheath part 2 absorbs far infrared rays, it is preferable to make the thickness of the sheath part 2 as thin as possible, usually less than 10μ, preferably less than 5μ, especially preferably less than 2μ. Figures 7, 8, and 11 show examples in which the far-infrared emitting layer has a plurality of core parts 1, and the thickness of the sheath part 2 is thin, and the strength of the entire fiber is maintained by the sheath part 2. It is often preferred because it is easy. 9 to 11 show examples of composite fibers of the present invention having hollow portions 3, which are often preferred for the purpose of bringing the ceramic layer as close to the outer layer as possible.

As shown in the cross-sectional view of FIG. 1, this heat-retaining material consists of three layers, and the material layer (4) is a fibrous structure using the composite fibers described above. The fiber structure is not particularly limited as long as it is in the form of a sheet, such as woven fabric, knitted fabric, or nonwoven fabric. Further, the composite wire ♀[:1] may be used uniformly over the entire surface of the fiber structure, and may be blended with other fibers, mixed knitted and woven, mixed twisted, mixed fibers, etc. However, it is preferable that the proportion of composite fibers is at least about 50% by weight of the fiber structure.

A synthetic resin film layer (5) is laminated on the base material layer (4). As the polymer used for the synthetic resin film layer (5), polyurethane and acrylate compounds are preferred, and it is desirable to form a porous film using these.

As the inorganic compound (6) added to the synthetic resin film layer (5), in addition to alumina, zirconia, magnesia, and titanium oxide as described above, carbonized ceramics and nitrided ceramics can be used. This is because the surface having the synthetic resin film layer (5) is often used on the inside of clothing, and colored compounds such as zirconium carbide can also be suitably used as the inorganic compound (6).

These inorganic compounds (6) usually contain 5 to 50% of the solid content of the resin.
It is preferable to use 70% by weight.

Synthetic resin film layer (5) containing inorganic compound (6) particles
The thickness is 5 to 1100p, more preferably 10 to 50μ
m is good. If it is less than 5μm, sufficient heat retention effect cannot be obtained,
If the thickness is 100 μm or more, the texture becomes hard and the moisture permeability decreases, so it is not suitable for practical use.

Furthermore, if the synthetic resin film layer (5) containing particles of the inorganic compound (6) is directly exposed to the surface layer, the abrasion fastness will be affected. 7) For example, it is necessary to provide a coating consisting of polyurethane and/or polyglutamate compounds. Furthermore, particles (8) of a Burl pigment or a pigment with metallic luster can also be blended into the top coat layer (7) in order to further improve the aesthetic effect.

(Example) (Example 1) 60 parts by weight of nylon bolymer powder has an average particle size of 0.6
A mixture obtained by kneading 20 parts by weight of γ-alumina with a purity of 99% or more in μm and 20 parts by weight of polyethylene wax was added, and a mixed polymer was obtained using a kneader.

Then, using a melt composite spinning machine, the mixed polymer is made into a core with 6
A composite with a concentric cross section (volume ratio 1:1) made of nylon polymer as a sheath, spun from a nozzle at 270°C, cooled, oiled, wound at 0.800 m/min, and further increased by 3.2 times. Stretched. A multifilament (single yarn: approximately 3.9 denier) of 18 filaments with a 70 denier was obtained, and a satin fabric (basis weight: 90 g/m2) was obtained by a known method.

After scouring and heat setting, this satin fabric was dyed with an acid dye, dried, and then treated with a fluorine-based water repellent to make it water repellent. Furthermore, using a cushion knife coater, crosslinking agent X0LTEX CL-15 (same as above)
3 Water
A resin having a composition of 40 was formed as an undercoat layer.

Main coat layer: Zirconium carbide powder 0 Water
A mixed resin consisting of 4011 was applied using a pipe doctor to a solid content of 30 g/m'' and a thickness of 35 μm.

Furthermore, a solid content of mica-based pearlized pigment (manufactured by Nihon Koken) 2 was applied to a thickness of 10 μm to form a top coat layer, followed by heat treatment at 160° C. for 1 minute using a pin tenter.

(Comparative Example 1) The core-sheath structure yarn with a concentric circular cross section in Example 1 was replaced with a regular 6 nylon yarn, and a 70 denier 18 filament multifilament was used to obtain a taffeta fabric (basis weight 70 g/m") using a known method. Ta.

This taffeta fabric was scoured, heat-scented, dyed, water-repellent treated, and undercoated in the same manner as in Example 1, and then coated in the same manner as in Example 1 with a mixed resin obtained by excluding the zirconium carbide powder from the main coat formulation. However, the top coat layer was also formed in the same manner as in Example 1.

(Comparative Example 2) A satin fabric similar to that of Example 1 was made except that the nylon 6 multifilament used in Comparative Example 1 was used, and scouring, heat setting, dyeing, and water repellent treatment were performed.

(Example 2) A mixture of polyethylene terephthalate and magnesia and polyethylene wax at a volume mixing ratio of 1/1 was kneaded using a kneading machine to obtain a mixed polymer having a magnesia mixing ratio of 15% by weight.

A concentric composite yarn with a volume of I:1 (10
0d/24f) was obtained. This composite yarn was used to weave and scouring the fill, and after heat-scenting, it was processed to reduce the weight by 10% by weight using soda. After drying, Example 1
Water repellent finishing, undercoat, main coat, top coat, and heat treatment were performed in the same manner as above.

Place each piece of fabric in a 15cm square frame in a room at 18℃, illuminate the back side of the fabric (coated side for coated items) with a 500 watt incandescent light bulb from a distance of 5Qcm, and measure the temperature of the non-irradiated side using a temperature sensor. Measurements were taken every minute.

The results are shown in Table 1.

(Comparative Example 3) The satin fabric obtained in Example 1 was heat set, dyed, water repellent, and undercoated by a known method, and the zirconium carbide powder was removed from the main coat formulation of Example 1 ( The remaining part was water) A mixed resin was applied in the same manner, and a top coat layer was also applied in the same manner as in Example 1. The temperature of the processed cloth was measured in the same manner as in Comparative Examples 1 and 2. The results are shown in Table 1. 3 4 (Results of the Invention) As stated above, the present invention further coats a synthetic resin containing particles of a specific inorganic compound in the process of processing core-sheath type fibers and fabrics that have a heat-retaining effect. This further enhances the heat absorbing effect and provides a highly functional material suitable for sports clothing and cold weather clothing.

Particularly in the present invention, the provision of the Totsubuko-1 layer has the effect of increasing the abrasion fastness of the synthetic resin coated surface, and further improves moisture permeability, thereby eliminating the feeling of stuffiness during wear.

The material according to the invention is ideal for use in cold regions,
It can promote blood flow and have health-promoting effects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view of a cross section of the present heat-retaining material, and FIG. 2 is an explanatory view of a cross section of a core-sheath type composite fiber that can be used in the present invention. 4... Base material layer, 5... Synthetic resin film layer, 6 Tosop coat.

Claims (1)

[Claims] (1) A base material layer consisting of a fiber structure using a core-sheath type composite fiber in which a polymer containing particles of an inorganic compound selected from the group of alumina, zirconia, magnesia, and titanium oxide is arranged in the core, alumina, A heat-retaining material made by sequentially laminating a synthetic resin film layer containing particles of an inorganic compound selected from the group of zirconia, magnesia, titanium oxide, carbide ceramics, and nitride ceramics, and a moisture-permeable top coat layer.