JP2000239532A - Thermoplastic resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition where a liquid crystal resin is uniformly dispersed in a thermoplastic resin of matrix and is oriented to form fiber, suitable as a composite material suitable for producing a high- performance molded product excellent in mechanical strength, dimensional stability or the like. SOLUTION: This thermoplastic resin composition comprises a thermoplastic resin and a liquid crystal resin, and the difference in melt viscosity measured at 1,000 sec-1 shear rate near the solid-liquid crystal transition temperature of the liquid crystal resin is 500-1,500 poises between the thermoplastic resin and the liquid crystal one. The thermoplastic resin composition where the liquid crystal resin is fiberized to be oriented in the thermoplastic resin is produced by kneading the thermoplastic resin and the liquid crystal one in a molten state near the solid-liquid crystal transition temperature of the liquid crystal resin and then by imparting 1×10-1-1×103 sec-1 elongation rate as an elongational stress to the mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin composition suitable mainly for a composite material.

[0002]

2. Description of the Related Art Conventionally, fiber-reinforced resin composite materials are widely known, for example, sheet molding compounds (SMC) in which a thermosetting resin contains glass fibers as reinforcing fibers, and a thermoplastic resin is used in glass fibers. Are often used for molded articles. Recently, natural fiber reinforced resin composite materials using natural fibers as reinforcing fibers have also been developed.

However, the fiber-reinforced resin composite material using solid fibers such as glass fiber and natural fiber has some problems in production.

[0004] That is, for example, when mixing or blending a resin and a solid fiber, the fiber is cut or the resin cannot be sufficiently impregnated on the fiber surface or in the fiber. There is a problem that the interfacial adhesion to the fiber is poor, and a sufficient reinforcing effect may not be obtained. In addition, when the reinforcing fiber is a fiber having a long continuous strand, it becomes difficult to manufacture a fiber reinforced resin composite material, and it becomes necessary to employ a special manufacturing apparatus and a manufacturing method, or it requires a great amount of manufacturing time. There are also problems.

To cope with these problems, various studies have been made on a so-called self-reinforced fiber-reinforced resin composite material in which a liquid crystal resin is fibrous and oriented in a thermoplastic resin as a matrix, and a method for producing the same. I have.

For example, Japanese Patent Application Laid-Open No. 62-116666 discloses a self-reinforced polymer containing a base polymer having a flexible chain and a melt-processable liquid crystal polymer incompatible with the base polymer. In the method for producing a combined composite, about 2 to about 20% by weight of a base polymer and a melt-processable liquid crystal polymer.
Are mixed at a temperature at which any of these polymers is melt processed, including the base polymer and the liquid crystal polymer, wherein the liquid crystal polymer is unidirectional in the base polymer matrix. Recovering the self-reinforced polymer composite present in the form of oriented fibers,
A method for producing a self-reinforced polymer composite '' has been disclosed,
Japanese Patent Application Laid-Open No. 1-25906 discloses that a resin composite comprising at least a thermoplastic liquid crystalline resin and a thermoplastic nylon, wherein the thermoplastic liquid crystalline resin has a fibrous structure in nylon. , A nylon resin composite ".

However, in the resin composite material or the method for producing the same as disclosed in the above disclosure, the dispersion of the liquid crystal resin in the matrix is not sufficient or the fiber form of the liquid crystal resin fiberized in the matrix is not good. However, there remain problems such as instability of physical properties and insufficient reinforcement effect.

[0008]

According to the present invention, in order to solve the above-mentioned conventional problems, a liquid crystal resin is uniformly dispersed in a thermoplastic resin which is a matrix, and is oriented in a fiber form. Accordingly, it is an object of the present invention to provide a thermoplastic resin composition suitable for a composite material suitable for obtaining a high-performance molded article having excellent mechanical strength and dimensional stability.

[0009]

The thermoplastic resin composition according to the first aspect of the present invention (hereinafter referred to as "first invention") comprises a thermoplastic resin composition containing a thermoplastic resin and a liquid crystal resin. And a melt viscosity difference between the thermoplastic resin and the liquid crystal resin measured at a shear rate of 1000 sec ^-1 at a temperature near the liquid crystal transition point of the liquid crystal resin is 500 to 15
It is characterized by being 00 poise. Here, the liquid crystal transition point means a temperature at which the liquid crystal resin changes from a solid phase to a liquid crystal state.

Further, the invention according to claim 2 (hereinafter referred to as “second
Invention)), the thermoplastic resin composition according to the first aspect.
In the thermoplastic resin composition according to the present invention, after the thermoplastic resin and the liquid crystal resin are melt-kneaded at a temperature equal to or higher than the liquid crystal transition point of the liquid crystal resin, the elongation rate of 1 × 10 ⁻¹ to 1 × 10 ³ sec ⁻¹ is increased. By being provided, the liquid crystal resin is fiberized and oriented in the thermoplastic resin.

The first invention and the second invention (hereinafter referred to as "the present invention")
The thermoplastic resin used as a main component of the thermoplastic resin composition according to the present invention is not particularly limited, and examples thereof include an ABS resin, an ethylene-vinyl acetate copolymer, a fluororesin, a polyacetal resin, and a polyamide. Resins, polyimide resins, amide imide resins, acrylimide resins, vinyl chloride resins, polyolefin resins, polyester resins, polycarbonate resins, polyacrylates, polyphenylene oxides, polystyrene resins, thermoplastic polyurethane resins, etc., and modified or blended materials (alloy materials) And the like, and are preferably used. Among them, a polyolefin resin whose viscosity hardly decreases during melting and a copolymer thereof are more preferably used.

The above thermoplastic resins may be used alone or in combination of two or more.

The thermoplastic resin may be cross-linked, if necessary, as long as the object of the present invention is not hindered.

The method of crosslinking is not particularly limited. For example, an electron beam crosslinking method in which an ionizing radiation such as an electron beam is irradiated, a chemical crosslinking method using an organic peroxide, or a silane compound is used. A silane crosslinking method and the like can be mentioned.

As a crosslinking method, a method of chemically linking polar functional groups present at the molecular terminals and / or in the molecular chain of a polar thermoplastic resin to improve the molecular weight (viscosity) of the thermoplastic resin. May be taken.

For example, in a polyester resin or a polyamide resin, a compound which reacts with a polar functional group such as a carboxyl group or an amino group present at a molecular terminal and / or in a molecular chain may be added for crosslinking.

The compound which reacts with a polar functional group such as a carboxyl group or an amino group may be any compound having a functional group capable of reacting with such a polar functional group, and is not particularly limited. And carboxylic acid anhydrides and polyfunctional epoxy compounds, and one or more of these are suitably used.

Among the above carboxylic anhydrides, pyromellitic anhydride and benzophenonetetracarboxylic anhydride are particularly preferably used. Among the above polyfunctional epoxy compounds, for example, trade name "TETRAD-D" A tetrafunctional nitrided epoxy such as (manufactured by Mitsubishi Gas Chemical Company) is particularly preferably used.

On the other hand, as the liquid crystal resin contained in the thermoplastic resin composition according to the present invention, those having a liquid crystal transition point higher than the melting point of the thermoplastic resin as the matrix resin are preferable, and are not particularly limited. However, for example, thermoplastic liquid crystal polyester, thermoplastic polyesteramide, and the like can be mentioned, and they are suitably used. Specific examples of the above-mentioned thermoplastic liquid crystal polyester and thermoplastic polyester amide are not particularly limited. For example, trade names “Vectra” (manufactured by Polyplastics), trade names “Econol” (Sumitomo Chemical Industries, Ltd.) ), Trade name "Zyder" (manufactured by Amoco), trade name "Rodrun"
And commercially available liquid crystal resins (manufactured by Unitika Ltd.).

The above liquid crystal resins may be used alone or in combination of two or more.

In the thermoplastic resin composition according to the present invention, the amount of the liquid crystal resin to be added to the thermoplastic resin is not particularly limited.
The liquid crystal resin is preferably 0.1 to 60 parts by weight, more preferably 1 to 30 parts by weight with respect to 0 parts by weight,
Particularly preferably, it is 3 to 20 parts by weight.

If the amount of the liquid crystal resin is less than 0.1 part by weight based on 100 parts by weight of the thermoplastic resin, the reinforcing effect of the liquid crystal resin may not be sufficiently obtained. If the amount of the liquid crystal resin exceeds 60 parts by weight, it may be difficult to uniformly disperse the liquid crystal resin in the thermoplastic resin.

In the thermoplastic resin composition according to the first invention, the melt viscosity of the thermoplastic resin and the melt viscosity of the liquid crystal resin measured at a temperature near the liquid crystal transition point of the liquid crystal resin at a shear rate of 1000 sec ^-1. Viscosity difference of 5
It is necessary to be 00 to 1500 poise, preferably 500 to 1000 poise. In addition, the said melt viscosity is the value measured based on JISK-7199 "The flow characteristic test method by the capillary rheometer of thermoplastics."

When the difference between the melt viscosities of the thermoplastic resin and the liquid crystal resin is less than 500 poise, the liquid crystal resin is not uniformly dispersed in the thermoplastic resin as a matrix, and the melt viscosity difference is less than 500 poise. When the melt viscosity of the thermoplastic resin itself becomes lower, the sufficient shear stress cannot be applied to the liquid crystal resin, and the liquid crystal resin becomes insufficiently fibrous. Conversely, if the melt viscosity difference exceeds 1500 poise, the melt viscosity difference between the thermoplastic resin and the liquid crystal resin becomes too large, making it difficult to uniformly mix the thermoplastic resin and the liquid crystal resin. .

Next, the thermoplastic resin composition according to the second invention is the thermoplastic resin composition according to the first invention described above, wherein the thermoplastic resin and the liquid crystal resin are melt-kneaded at a temperature equal to or higher than the liquid crystal transition point of the liquid crystal resin. 1 × 10 ^-1 to 1 × 1
Elongation rate of 0 ³ sec ⁻¹ , preferably 1 × 10 ¹ to 1 ×
By being given an elongation rate of 10 ² sec ⁻¹ , the liquid crystal resin is fiberized and oriented in the thermoplastic resin.

The above-mentioned fiberized liquid crystal resin refers to the aspect ratio (dispersion length / dispersion length) of the liquid crystal resin dispersed in the thermoplastic resin.
(Dispersion diameter) is at least 1.5 or more.

In the thermoplastic resin composition according to the second aspect of the present invention, the aspect ratio of the liquid crystal resin is preferably in the range of 50 to 5,000, more preferably in the range of 100 to 3,000. It is.

When the aspect ratio of the liquid crystal resin is less than 50, the effect of reinforcing the liquid crystal resin with respect to the thermoplastic resin may be insufficient. Conversely, when the aspect ratio of the liquid crystal resin exceeds 5,000, the thermoplastic resin may be insufficient. When the composite material composed of the composition is in the form of a strand, in the cross section of the strand, the number of fibers of the liquid crystal resin fiberized in the thermoplastic resin is reduced, and it is difficult to uniformly and sufficiently reinforce the thermoplastic resin. Sometimes.

Although there is no particular limitation, the fiber diameter of the liquid crystal resin fiberized in the thermoplastic resin is preferably 10 μm or less. The fiber diameter of the liquid crystal resin is 10
When the composite material of the thermoplastic resin composition is in the form of a strand, the dispersion of the fibrous liquid crystal resin in the cross section of the strand becomes good,
In addition, since the number of fibers of the liquid crystal resin increases, the surface appearance of the composite material becomes good, and the physical properties of the composite material become stable.

The method of fibrillating the liquid crystal resin in the thermoplastic resin is not particularly limited. For example, after melt-kneading the thermoplastic resin and the liquid crystal resin, the obtained thermoplastic resin composition is mixed. At the time of molding, for example, by applying an elongation stress to the thermoplastic resin composition in an extruder, a mold, or near a mold outlet, the liquid crystal resin can be easily fiberized in the thermoplastic resin.

In the thermoplastic resin composition according to the second invention, the thermoplastic resin and the liquid crystal resin are melt-kneaded at a temperature equal to or higher than the liquid crystal transition point of the liquid crystal resin.
By giving an elongation rate of × 10 ⁻¹ to 1 × 10 ³ sec ⁻¹ , preferably 1 × 10 ¹ to 1 × 10 ² sec ⁻¹ , the liquid crystal resin is fibrillated in the thermoplastic resin, It must be oriented.

When the melting and kneading temperature of the thermoplastic resin and the liquid crystal resin is lower than the liquid crystal transition point of the liquid crystal resin, the liquid crystal resin is not uniformly dispersed in the thermoplastic resin, and therefore a sufficient reinforcing effect is obtained. I can't.

If the elongation rate applied as the elongation stress is less than 1 × 10 ⁻¹ sec ⁻¹ , the liquid crystal resin will not be sufficiently fibrous, so that a sufficient reinforcing effect cannot be obtained. Conversely, the elongation rate applied as elongation stress is 1 × 10 ³ sec.
If c ^-1 is exceeded, the thermoplastic resin as a matrix cannot withstand this elongation stress and breaks, making it difficult to continuously obtain a composite material from the thermoplastic resin composition.

The method for producing a composite material using the thermoplastic resin composition according to the second invention may be a conventionally known method,
Although not particularly limited, a melt blending method is preferable, and a description will be given below as a representative example of the production method.

First, a thermoplastic resin and a liquid crystal resin are dry-blended. Next, the thermoplastic resin and the liquid crystal resin are melt-kneaded at a temperature equal to or higher than the liquid crystal transition point of the liquid crystal resin using a conventionally known general kneader such as an extruder or a kneader. At this time, for example, by giving the elongation rate of 1 × 10 ⁻¹ to 1 × 10 ³ sec ⁻¹ to the kneaded product of the thermoplastic resin composition in an extruder or in a mold or in the vicinity of a mold outlet, for example, The liquid crystal resin easily becomes fibrous in the thermoplastic resin which is the matrix, and an oriented composite material can be obtained.

When it is desired to obtain a high-strength molded body, for example, the liquid crystal contained in the composite material obtained by the above method is added to the composite material in a stream of an inert gas such as nitrogen gas or under vacuum. Temperature above the liquid crystal transition point of the resin, preferably 2
It is preferable to perform high temperature treatment at a temperature of 00 ° C. or higher. By performing the high-temperature treatment, the liquid crystal resin undergoes solid-phase polymerization in the composite material and becomes infusible, so that the obtained molded body has high strength.

When the liquid crystal resin is a thermoplastic aromatic liquid crystal polyester, the liquid crystal resin is chain-extended by using a bifunctional compound such as an oxadrine derivative capable of undergoing an addition reaction with a terminal carboxyl group. It may be infusible.

The determination as to whether or not the liquid crystal resin is fiberized in the thermoplastic resin is not particularly limited. For example, the obtained composite material is immersed in a solvent such as hot xylene. After eluting only the thermoplastic resin, it can be performed by confirming whether or not the liquid crystal resin is fibrillated. When the liquid crystal resin is fibrillated, the average fiber length and average fiber diameter can be measured by observing the taken-out fibril-shaped liquid crystal resin using, for example, an SEM.

The thermoplastic resin composition according to the present invention may contain, if necessary, a thermoplastic resin and a liquid crystal resin in addition to the thermoplastic resin and the liquid crystal resin, which are essential components, as long as the object of the present invention is not hindered. A compatibilizer may be added to improve the compatibility.

The compatibilizer is not particularly limited. For example, when the thermoplastic resin is a polyolefin resin, a copolymer of an olefin component and a styrene component or an aromatic polyester component, or maleic acid And a polyolefin resin copolymer containing a glycidyl methacrylate component. One or more of these are preferably used. The amount of the compatibilizer to be added is not particularly limited, as long as it is appropriately set according to the composition, type, mixing ratio and the like of the thermoplastic resin and the liquid crystal resin.

In the thermoplastic resin composition according to the present invention, in addition to the essential components of the thermoplastic resin and the liquid crystal resin, and the above-mentioned compatibilizer which is added as necessary, a range which does not impair the achievement of the object of the present invention. If necessary, one or more of various additives such as a flame retardant, a filler, an antioxidant, a nucleating agent, and a pigment may be added.

The flame retardant is not particularly limited. For example, brominated flame retardants such as hexabromobiphenol ether and decabromodiphenyl ether;
Examples thereof include phosphorus-containing flame retardants such as ammonium polyphosphate, trimethylphosphonate, and triethylphosphonate, melamine derivatives, inorganic flame retardants, and the like. One or more of these are suitably used.

[0043]

The thermoplastic resin composition according to the first invention has a shear rate of 1000 s at a temperature near the liquid crystal transition point of the liquid crystal resin.
Since the difference in melt viscosity between the thermoplastic resin and the liquid crystal resin measured at ec ^-1 is specified to be in the range of 500 to 1500 poise, the dispersion of the liquid crystal resin in the thermoplastic resin is uniform, and therefore excellent. Demonstrate the reinforcing effect.

Further, the thermoplastic resin composition according to the second invention is the same as the thermoplastic resin composition according to the first invention,
After the thermoplastic resin and the liquid crystal resin are melt-kneaded at a temperature equal to or higher than the liquid crystal transition point of the liquid crystal resin, an extension stress of 1 × 10
^Since an elongation rate of ^-1 to 1 × 10 ³ sec ^-1 is given,
The liquid crystal resin is easily fiberized and oriented in the thermoplastic resin. Therefore, the reinforcing effect of the liquid crystal resin is further enhanced, and the composite material is suitable for obtaining a molded article having excellent mechanical strength, dimensional stability, and the like.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In the examples, “parts” means “parts by weight”.

(Example 1)

(1) Production of Composite Material 86 parts of polypropylene resin (trade name “PS201A”, density 0.9 g / cm ³ , manufactured by Nippon Polyolefin Co., Ltd.) and liquid crystal resin (trade name “Vectra A950”, liquid crystal transition point 280 ° C.) 14 parts, manufactured by Polyplastics Co., Ltd.). Shear rate 1 at liquid crystal transition point (280 ° C)
The melt viscosity difference between the polypropylene resin and the liquid crystal resin measured at 000 sec ⁻¹ was 780 poise. Next, using a twin-screw kneading extruder (trade name “PCM-30”, manufactured by Ikegai Kiko Co., Ltd.), the above-obtained dry blend was melt-kneaded, extruded from a 5 mm-diameter strand die, and cooled with water. A strand-like composite material composed of a polypropylene resin and a liquid crystal resin was obtained through a step of taking by a take-up machine. The barrel temperature and the mold temperature during the extrusion were set to 290 ° C. The extension speed is 2
0.8 sec ^-1 and the pickup ratio at the time of pickup is 2
It was 1.6 times. The elongation rate and the take-off ratio were calculated by the following equations.

(2) Preparation of molded body The strand-like composite material obtained above was cut into a length of 150 mm to obtain a cut strand. Next, 22.5 g of the obtained cut strand was 150 mm × 150 mm.
After being aligned in one direction in a spacer of 1 mm x 1 mm,
It was hot-pressed for 3 minutes at a temperature of 180 ° C. and a pressure of 100 kg / cm ² , and was cooled to obtain a unidirectionally reinforced sheet (molded body).

(3) Evaluation The average fiber length and average fiber diameter of the fibrillated liquid crystal resin in the composite material obtained in (1) and the unidirectional reinforced sheet (formed body) obtained in (2) The tensile strength and the elastic modulus were evaluated by the following methods. The results were as shown in Table 1.

Average Fiber Length and Average Fiber Diameter of Liquid Crystal Resin The composite material is immersed in hot xylene (120 ° C.) for 24 hours to elute only the polypropylene resin and to confirm that the liquid crystal resin is fibrillated (fibrillated). confirmed. Then
The fibril-shaped liquid crystal resin was taken out, observed by SEM, and the average fiber length (mm) and average fiber diameter (μm) were measured.

Tensile Strength and Elastic Modulus of Unidirectional Reinforced Sheet A unidirectional reinforced sheet is dumbbelled (distance between tension grips: 80 m).
m, width 10 mm), and then a strain rate of 10 mm /
The tensile test was performed in minutes, and the tensile strength (MPa) and elastic modulus (GPa) were determined.

[0052] (Example 2) Polypropylene resin (trade name "Nobattekku EA9", density of 0.9 g / cm ^3, manufactured by Nippon Polychem Co., Ltd.) 86 parts of the liquid crystal resin "Vectra A95
0 ”and 14 parts were dry-blended. Liquid crystal transition point (280
C), the difference in melt viscosity between the polypropylene resin and the liquid crystal resin measured at a shear rate of 1000 sec ^-1 is 720.
Poise. Next, in the same manner as in Example 1, a strand-like composite material composed of a polypropylene resin and a liquid crystal resin was obtained. The barrel temperature and the mold temperature during extrusion were set at 290 ° C. The elongation speed is 19.2.
sec ⁻¹ and the take-up ratio at the time of take-off was 20.0 times. Next, a unidirectionally reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

Example 3 86 parts of a polypropylene resin (trade name “Novatec EG8”, density 0.9 g / cm ³ , manufactured by Nippon Polychem Co., Ltd.) and liquid crystal resin “Vectra A95”
0 ”and 14 parts were dry-blended. Liquid crystal transition point (280
C), the melt viscosity difference between the polypropylene resin and the liquid crystal resin measured at a shear rate of 1000 sec ^-1 is 640.
Poise. Next, in the same manner as in Example 1, a strand-like composite material composed of a polypropylene resin and a liquid crystal resin was obtained. The barrel temperature and the mold temperature during extrusion were set at 290 ° C. The elongation speed is 16.8.
sec ⁻¹ and the take-up ratio at the time of take-off was 17.5 times. Next, a unidirectionally reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

Example 4 86 parts of a polypropylene resin (trade name “Novatec FY4”, density 0.9 g / cm ³ , manufactured by Nippon Polychem Co., Ltd.) and a liquid crystal resin “VECTRA A95”
0 ”and 14 parts were dry-blended. Liquid crystal transition point (280
C), the difference in melt viscosity between the polypropylene resin and the liquid crystal resin measured at a shear rate of 1000 sec ^-1 is 510.
Poise. Next, in the same manner as in Example 1, a strand-like composite material composed of a polypropylene resin and a liquid crystal resin was obtained. The barrel temperature and the mold temperature during extrusion were set at 290 ° C. The elongation speed is 14.4.
sec ⁻¹ and the take-up ratio at the time of take-off was 15.0 times. Next, a unidirectionally reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

Comparative Example 1 86 parts of a polypropylene resin (trade name “Novatec MA3”, density 0.9 g / cm ³ , manufactured by Nippon Polychem Co., Ltd.) and a liquid crystal resin “VECTRA A95”
0 ”and 14 parts were dry-blended. Liquid crystal transition point (280
C.), the difference in melt viscosity between the polypropylene resin and the liquid crystal resin measured at a shear rate of 1000 sec ^-1 is 144.
Poise. Next, in the same manner as in Example 1, a strand-like composite material composed of a polypropylene resin and a liquid crystal resin was obtained. The barrel temperature and the mold temperature during extrusion were set at 290 ° C. The extension speed is 9.6s
ec ^-1 and the take-off ratio at the time of take-off was 10.5 times. Next, a unidirectionally reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

Comparative Example 2 Polypropylene resin (trade name)
"Novatec SA05", density 0.9g / cm ^Three,Day
86 parts of this Polychem Corporation and liquid crystal resin "VECTRA A95
0 ”and 14 parts were dry-blended. Liquid crystal transition point (280
C) at a shear rate of 1000 sec.^-1Measured above
The melt viscosity difference between polypropylene resin and liquid crystal resin is 14 points.
It was. Then, in the same manner as in Example 1,
Strand made of polypropylene resin and liquid crystal resin
Was obtained. Barrel temperature and mold temperature during extrusion
The temperature was set at 290 ° C. The extension speed is 9.8 sec.
^-1The collection ratio at the time of collection is 10.7 times.
Was. Next, the strand-like composite material obtained above was used.
In the same manner as in Example 1, the one-way reinforced sheet
(Formed body) was obtained.

Comparative Example 3 A strand-shaped composite material was produced in the same manner as in Example 1 except that only the polypropylene resin “PS201A” was used and the liquid crystal resin “Vectra A950” was not used in the production of the composite material. I got Next, a unidirectional reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

(Comparative Example 4) In the production of a composite material, only the polypropylene resin "Novatec EA9" was used.
A strand-shaped composite material was obtained in the same manner as in Example 2 except that the liquid crystal resin “VECTRA A950” was not contained. Next, a unidirectional reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

(Comparative Example 5) In the production of a composite material, only the polypropylene resin "Novatec EG8" was used.
A strand-shaped composite material was obtained in the same manner as in Example 3 except that the liquid crystal resin “VECTRA A950” was not contained. Next, a unidirectional reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

(Comparative Example 6) In the production of a composite material, only the polypropylene resin "Novatech FY4" was used.
A strand-shaped composite material was obtained in the same manner as in Example 4 except that the liquid crystal resin “VECTRA A950” was not contained. Next, a unidirectional reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

(Comparative Example 7) In the production of a composite material, only the polypropylene resin "Novatec MA3" was used.
A strand-shaped composite material was obtained in the same manner as in Comparative Example 1 except that the liquid crystal resin “VECTRA A950” was not contained. Next, a unidirectional reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

Comparative Example 8 A strand-shaped composite material was produced in the same manner as in Comparative Example 2 except that the polypropylene resin “Novatec SA05” was used alone and the liquid crystal resin “Vectra A950” was not used. The material was obtained. Next, a unidirectional reinforced sheet (molded body) was obtained in the same manner as in Example 1 using the strand-like composite material obtained above.

The average fiber length and average fiber diameter of the fibrillated liquid crystal resin in the five types of composite materials obtained in Examples 2 to 4 and Comparative Examples 1 and 2 were set in the same manner as in Example 1. evaluated. The results were as shown in Table 1.

The tensile strength and elastic modulus of the 11 types of unidirectionally reinforced sheets (compacts) obtained in Examples 2 to 4 and Comparative Examples 1 to 8 were evaluated in the same manner as in Example 1. did. The results were as shown in Table 1.

[0065]

[Table 1]

As is clear from Table 1, in the composite materials of Examples 1 to 4 according to the present invention, the liquid crystal resin was easily fiberized. In addition, Examples 1 to 5 produced using the above composite materials
The one-way reinforced sheet (molded product) No. 4 was excellent in both tensile strength and elastic modulus. This indicates that the reinforcing effect of the liquid crystal resin which was fiberized and oriented in the composite material was remarkable.

On the other hand, the liquid crystal transition point (28
(0 ° C.), one direction of Comparative Examples 1 and 2 produced using the composite materials of Comparative Examples 1 and 2 in which the melt viscosity difference between the polypropylene resin and the liquid crystal resin measured at a shear rate of 1000 sec ⁻¹ was less than 500 poise. Reinforced sheet (formed body)
Was inferior in tensile strength and elastic modulus.

Comparative Example 3 containing no liquid crystal resin
The unidirectionally reinforced sheets (compacts) of Comparative Examples 3 to 8 produced using the composite materials of Nos. To 8 were also inferior in tensile strength and elastic modulus.

[0069]

As described above, the thermoplastic resin composition according to the present invention exhibits excellent physical properties due to the reinforcing effect of the liquid crystal resin, so that a high-performance molded article excellent in mechanical strength, dimensional stability, etc. Is suitably used for a composite material suitable for obtaining

Claims (2)

[Claims] 1. A thermoplastic resin composition containing a thermoplastic resin and a liquid crystal resin, wherein the thermoplastic resin and the liquid crystal are measured at a temperature near a liquid crystal transition point of the liquid crystal resin at a shear rate of 1000 sec ^-1. Melt viscosity difference with resin is 50
A thermoplastic resin composition having a viscosity of 0 to 1500 poise. 2. After the thermoplastic resin and the liquid crystal resin are melt-kneaded at a temperature equal to or higher than the liquid crystal transition point of the liquid crystal resin, 1 × 10
^The thermoplastic resin composition according to claim 1, wherein the liquid crystal resin is fiberized and oriented in the thermoplastic resin by giving an elongation rate of ^-1 to 1 x 10 ³ sec ^-1. object.