JPH10212418A - Composite resin sheet for thermoforming, its production and production of formed article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject sheet reinforcible in high efficiency, exhibiting excellent draw-down resistance, formability and dimensional stability, low linear expansion coefficient and high mechanical strengths and useful for automobile part, etc., by using a liquid crystal resin in a fibrillated state as a reinforcing material. SOLUTION: This thermoforming composite resin sheet having a thickness of 0.1-5mm is produced by dispersing (A) 0.1-50wt.% of a liquid crystal resin such as thermoplastic liquid crystal polyester (amide) in a fabricated state (preferably at an aspect ratio of >=10 and a fibril diameter of 0.1-100μm) in (B) 50-99.9wt.% of a thermoplastic resin having a melting point or melting temperature lower than the transition temperature of the component A (e.g. polystyrene or a non-cross-linked or cross-linked polyolefin resin).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermosetting composite resin sheet comprising a thermoplastic resin and a liquid crystal resin and having excellent mechanical strength and dimensional stability, a method for producing the same, and a thermoforming composite resin sheet. The present invention relates to a method for producing a shaped body.

[0002]

2. Description of the Related Art In general, various resin composite materials are used as materials for automobile parts such as door pads, inside panels, bumper beams, etc., and most of them are formed by thermoforming. .

[0003] Conventionally, for example, JP-A-8-208912 discloses a resin composition for blow molding comprising a polypropylene resin and high-density polyethylene and having excellent drawdown resistance and molding workability. In the resin composition, drawdown resistance and high moldability are realized by optimizing the viscosity characteristics of the resin.However, materials for automobile parts have high dimensional stability and low linear expansion coefficient. Therefore, it is difficult to satisfy the required quality with a material in which the reinforcing material is not present in the matrix.

In recent years, liquid crystalline polyester resins have attracted attention as materials capable of achieving high dimensional stability and low linear expansion coefficient.
Compositions containing glass fibers have been proposed. As such a material, for example, JP-A-8-231832 discloses a liquid crystalline polyester resin composition.

[0005]

However, in the system in which glass fibers are dispersed in the liquid crystalline polyester described in the above-mentioned publication, the glass fiber length becomes shorter and the aspect ratio becomes smaller at the time of melt-kneading. Is difficult to obtain, and the improvement of the mechanical strength of the composite resin sheet is still insufficient.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and to be efficiently reinforced by a fibrillated liquid crystal resin, to have excellent drawdown resistance and molding workability, and to have high dimensional stability and low linearity. To provide a composite resin sheet for thermoforming having a high expansion ratio and high mechanical strength, and to provide a method for efficiently and continuously producing a composite resin sheet for thermoforming, and a composite resin for thermoforming. An object of the present invention is to provide a method for producing a shaped composite resin sheet having a high tensile strength and a low coefficient of linear expansion using a sheet.

[0007]

In order to achieve the above object, the present invention uses a liquid crystal resin as a reinforcing material in a fibril state without using glass fibers having a small aspect ratio during melt kneading. It has special features.

That is, since the molecular chains of the liquid crystal resin are arranged in parallel with each other, when the mixture with the thermoplastic resin is melt-kneaded and allowed to flow, it is easily oriented in the flow direction and fibrillated. When the liquid crystal resin is fibrillated, it becomes a reinforced composite material in the same manner as a conventional material to which glass fiber is added.
By utilizing this property of the liquid crystal resin, a reinforced composite material can be easily obtained.

The composite resin sheet for thermoforming according to the present invention comprises:
0.1 to 50% by weight of a liquid crystal resin, having a melting point or melting temperature lower than the transition point of the liquid crystal resin, and
It is composed of a mixture with 9.9% by weight of a thermoplastic resin, characterized in that the liquid crystal resin is dispersed in the thermoplastic resin in a fibril state and the sheet thickness is 0.1 to 5 mm.

The thermoplastic resin of the composite resin sheet for thermoforming is preferably composed of a non-crosslinked polyolefin resin and a crosslinkable polyolefin resin.

Further, the method for producing a composite resin sheet for thermoforming according to the present invention is characterized in that 0.1 to 50% by weight of a liquid crystal resin has a melting point or melting temperature lower than the transition point of the liquid crystal resin and 50 to 50% by weight. After melt-kneading a mixed composition with 99.9% by weight of a thermoplastic resin at a temperature not lower than the transition point of the liquid crystal resin, it is applied to a sheet at a temperature lower than the transition point of the liquid crystal resin and higher than the melting temperature of the thermoplastic resin. It is characterized in that it is shaped and then cooled to a temperature below the melting temperature of the thermoplastic resin to obtain a sheet.

Further, in the method for producing a shaped article according to the present invention, the above-mentioned thermoforming composite resin sheet is used, and the thermoforming composite resin sheet is heated to a temperature lower than the transition point of the liquid crystal resin and higher than the melting temperature of the thermoplastic resin. It is characterized in that an extruded body is obtained by thermoforming with the above.

The liquid crystal resin that can be used in the present invention is not particularly limited as long as it has a liquid crystal transition point temperature higher than the melting point or melting temperature of the thermoplastic matrix resin. Preferred is a thermoplastic liquid crystal polyester amide, and specific examples thereof include a wholly aromatic polyester-based liquid crystal polymer that is commercially available under trade names such as Vectra, Econol, and Zyder.
Semi-aromatic polyester-based liquid crystal polymers marketed under trade names such as rodrun, novaculate, and LCP are exemplified.

Examples of the thermoplastic resin include ABS resin, ethylene-vinyl acetate copolymer, fluorine resin, acetal resin, amide resin, imide resin, amide imide resin, acrylic resin, vinyl chloride resin, olefin resin, polyester, polycarbonate, poly Melt-moldable resins such as acrylates, polyphenylene oxides, polystyrenes, thermoplastic polyurethanes, and the like, and modifiers or blends thereof (alloy materials) are mentioned. Among these resins, polyolefin, polystyrene, and copolymers thereof are particularly preferred. The polyolefin will be described later.

In the present invention, the mixing ratio of the liquid crystal resin to the thermoplastic resin reduces the drawdown property at the time of molding, and at the same time, achieves the dimensional stability and the low coefficient of linear expansion of the obtained composite resin sheet for thermoforming. Therefore, the amount of the liquid crystal resin is 0.1% based on the total amount of the thermoplastic resin and the liquid crystal resin of 100% by weight.
It is necessary to be in the range of 1 to 50% by weight, preferably in the range of 1 to 30% by weight of the liquid crystal resin, more preferably in the range of 3 to 20% by weight.

Here, the compounding amount of the liquid crystal resin is 0.1% by weight.
If it is less than 50, the above problem cannot be solved, and 50
Exceeding the weight percentage is not preferred because the fluidity is too high and the moldability decreases.

If necessary, the mixed resin composition of the liquid crystal resin and the thermoplastic resin may be mixed with each other before or during molding in order to improve the mutual compatibility according to the composition of the liquid crystal resin and the thermoplastic resin. The agent is added. The compatibilizer, for example, when the thermoplastic resin is an olefin resin, a copolymer of an olefin component and a styrene component or an aromatic polyester component, an olefin resin having a maleic acid component or an acrylic acid component, an olefin having a glycidyl methacrylate component There are resin copolymers and the like.

The number of parts to be added of the compatibilizer is appropriately selected depending on the composition and ratio of the mixed system.

[0019]

Next, an embodiment of the present invention will be described.
This will be described in detail below.

In the composite resin sheet for thermoforming according to the present invention, the liquid crystal resin needs to be in a fibril state in the thermoplastic resin. By being in a fibril state in this way, it becomes possible to exhibit dimensional stability and a low coefficient of linear expansion as in the case of the glass fiber of the conventional reinforced composite material.

Here, the fibril state means a state in which the aspect ratio (dispersion length / dispersion diameter) of the liquid crystal resin dispersed in the thermoplastic resin is 1 or more.

The aspect ratio of the liquid crystal resin fibrils in the present invention is preferably 10 or more. Further, the fibril diameter is preferably 0.1 to 100 μm,
0 μm is more preferred.

An external stress such as a shear stress or an elongation stress is applied to the composition comprising the thermoplastic resin and the liquid crystal resin at a temperature equal to or higher than the liquid crystal transition point of the liquid crystal resin, so that the dispersion state of the liquid crystal resin in the composition is changed. It can be in a fibril state.

Melt kneading of thermoplastic resin and liquid crystal resin
At the time, for example, in an extruder or a mold, shear is given.
This makes it possible to easily fibrillate the liquid crystal resin.
it can. Liquid crystal resin in fibril form in matrix resin
The apparent shear rate acting on the blended resin becomes
1 × 10^Two~ 1 × 10^Fivesec^-1, Preferably 3 × 10
^Two~ 1 × 10^Foursec^-1It is necessary to In this range
The liquid crystal resin in the blend extruded at the shear rate is:
Easy to fibrillate, usually with a fibril diameter of 10 μm or less
Below, those having a fibril length of 0.1 mm or more are easily obtained.

The method of mixing the thermoplastic resin and the liquid crystal resin is not particularly limited. For example, a method in which a thermoplastic resin and a liquid crystal resin are dry-blended with a mixer such as a tumbler and then melt-kneaded with a twin-screw extruder, and a method of melt-kneading with two opposing rolls, and the like.

Referring to FIG. 1, after pellets of a thermoplastic resin and a liquid crystal resin are put into a hopper (1), the thermoplastic resin and the liquid crystal resin are melted and kneaded by, for example, a twin screw extruder (2).

In order to form the kneaded product of the thermoplastic resin and the liquid crystal resin thus obtained into a sheet, for example, an extruder
The composite for thermoforming according to the present invention is extruded from a T-die (3) arranged following (2) and sized by passing between two cooling rolls (4) and (4) having a predetermined clearance. A resin sheet (10) can be obtained.

At this time, the thickness of the obtained sheet (10) can be changed by appropriately adjusting the clearance between the cooling rolls (4) and (4).

The thickness of the composite resin sheet for thermoforming according to the present invention needs to be 0.1 to 5 mm, preferably 0.3 to 4 mm, more preferably 0.5 to 3 mm. Here, the thickness of the composite resin sheet for thermoforming is 0.1
If the thickness is less than 5 mm, the composite resin sheet may be broken during molding. If the thickness of the composite resin sheet exceeds 5 mm, a large pressure is required for shaping, and the thickness of the obtained shaped body is not uniform. Is not preferred.

Next, a second aspect of the present invention will be described.

According to a second aspect of the present invention, in the composite resin sheet for thermoforming, the thermoplastic resin comprises a non-crosslinked polyolefin resin and a crosslinkable polyolefin resin.

The non-crosslinked polyolefin resin includes homopolymers such as low-density polyethylene, high-density polyethylene, linear low-density polyethylene, homopolypropylene, random polypropylene, block polypropylene, and ethylene-vinyl acetate copolymer. (EVA) and copolymers such as ethylene-acrylic acid copolymer (EEA). Of these, particularly preferred are low density polyethylene, homopolypropylene, and high density polyethylene. These may be used alone or in combination of two or more.

Examples of the crosslinkable polyolefin resin include a polyolefin resin containing a peroxide and a reactive monomer, a silane crosslinkable polyolefin resin, and a polyethylene resin which can be crosslinked by ionizing radiation.

Examples of the method for crosslinking these crosslinkable polyolefin resins include a method using a peroxide, a method by water crosslinking, and a method of irradiating with ionizing radiation.

In the method using a peroxide, various radical generators such as benzoyl peroxide are mixed with a thermoplastic resin alone or with a monomer having a vinyl group (eg, a styrene monomer) or a polymer (eg, a butadiene polymer). This is a method of crosslinking by heating to a temperature higher than the decomposition temperature of the peroxide. Therefore, in the present invention, molding can be performed using an olefin resin in which a peroxide or the like is previously blended, and crosslinking can be performed by heat history during molding or by heat treatment after molding.

The method by water crosslinking is a method in which a silane-crosslinkable polyolefin resin is used, and the composite resin sheet formed as described above is crosslinked by contact with water or steam. The temperature and time at the time of contact are appropriately selected.

In this case, the silane-crosslinkable polyolefin resin refers to a thermoplastic resin such as polyethylene or polypropylene obtained by graft-modifying a silane compound having an unsaturated group, or a copolymer thereof. Examples of the silane compound having an unsaturated group include, for example, vinyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and the like.

The silane crosslinkable polyolefin resin is
It has an alkoxy group (for example, a methoxy group), and the alkoxy group and water come into contact and hydrolyze to form a silanol group (hydroxyl group). The hydroxyl group reacts with the hydroxyl group of another molecule to form a Si—O—Si bond, whereby a crosslinked thermoplastic resin is obtained.

At this time, a silanol condensation catalyst may be used in combination to promote crosslinking. Examples of such a silanol condensation catalyst include dibutyltin diphthalate, dibutyltin dilaurate, cobalt octoate, and zinc stearate.

The addition amount of the silanol condensation catalyst is preferably 0.001 to 10% by weight based on the silane crosslinkable polyolefin resin.

The method of cross-linking using ionizing radiation is a method of cross-linking by irradiating a molded article with an electron beam, γ-ray or the like. At this time, the above-mentioned peroxide or monomer having a vinyl group may be combined.

As other methods, there are a method of crosslinking using ultraviolet light and a method of crosslinking using visible light. At this time, an initiator that is decomposed by ultraviolet light or visible light to generate a radical is appropriately added to the thermoplastic resin.

These crosslinking treatment methods may be used alone or in combination.

The mixing ratio of the non-crosslinked polyolefin and the crosslinkable polyolefin used in the present invention is such that 1 to 99 parts by weight of the noncrosslinked polyolefin and 9
9 to 1 part by weight. Also, as a mixing method of these,
Melt kneading using a twin-screw extruder or the like is exemplified.

The gel fraction after crosslinking is preferably in the range of 1 to 40%, particularly preferably in the range of 3 to 30%, and more preferably in the range of 5 to 25%.

The gel fraction is measured by immersing the sample in xylene at 120 ° C. for 24 hours.

The gel fraction is a percentage of the weight of the resin remaining at that time relative to the weight of the original sample.

Next, a third aspect of the present invention will be described.

In the method for producing a composite resin sheet for molding according to the present invention, the resin composition in which 0.1 to 50% by weight of a liquid crystal resin and 50 to 99.9% by weight of a thermoplastic resin are blended is used. Is melt-kneaded at a temperature equal to or higher than the transition point. At this stage, the liquid crystal resin is fibrillated because it is elongated and flows by the thermoplastic resin of the matrix in a molten state.

The method of melt-kneading may be any method generally used, and examples thereof include a twin-screw extruder, a single-screw extruder, and a method of kneading with two opposing rolls.

During melt-kneading, the apparent shear rate given to the blend resin because the liquid crystal resin becomes fibril-like in the matrix resin is 1 × 10 ² to 1 × 10 ⁵ sec.
^-1 is preferred, and more preferably 3 × 10 ² to 1 ×.
The range is 10 ⁴ sec ⁻¹ .

In FIG. 1, for example, in a twin-screw extruder (2) for melting and kneading a thermoplastic resin and a liquid crystal resin, an extruder
The temperature in the so-called barrel section (S1) in (2) needs to be equal to or higher than the transition point of the liquid crystal resin.

Next, the melt-kneaded resin composition is shaped into a sheet by extruding it with, for example, a T-die (3). At this time, the temperature in the section (S2) in the T-die (3) is adjusted. Must be controlled to be equal to or lower than the transition point of the liquid crystal resin and equal to or higher than the melting temperature of the thermoplastic resin.

At this time, by controlling the temperature in the section (S2) in the T-die (3) below the transition point of the liquid crystal resin and above the melting temperature of the thermoplastic resin, the liquid crystal resin fibrillated in the previous stage is The thermoplastic resin of the matrix can be shaped into a sheet while maintaining the above-mentioned form.

When the liquid crystal resin is formed into a sheet at a temperature higher than the transition point of the liquid crystal resin, the liquid crystal resin once fibrillated becomes T
Immediately after coming out of the die, the resin composition is relaxed and returns to a particle state. Conversely, when the temperature is lower than the melting temperature of the thermoplastic resin, the resin composition is completely solidified and cannot be formed into a sheet shape.

Then, the resin composition shaped into a sheet is subsequently passed between the two cooling rolls (4) and (4) in FIG. 1 and sized, so that the melting temperature of the thermoplastic resin is lowered. The thermosetting composite resin sheet of the present invention (1
0).

The method of cooling is not particularly limited, and is achieved by, for example, a method of water cooling in a cooling water tank, or a method of passing between two opposed rolls whose temperature is controlled to be equal to or lower than the melting temperature of the thermoplastic resin. . In this case, if the clearance between the two opposing rolls is set to a desired clearance, a composite resin sheet for thermoforming having an intended thickness can be obtained.

Next, claim 4 of the present invention will be described.

In the method for producing a shaped article according to the present invention, the composite resin sheet for thermoforming according to claim 1 or 2 is thermoformed at a transition temperature of a liquid crystal resin or lower and a melting temperature of a thermoplastic resin or higher. Thus, a shaped body reinforced with a liquid crystal resin in a fibril state is obtained.

The composite resin sheet for thermoforming (10) having a predetermined thickness obtained by the above method is formed into a bowl shape by press molding at a temperature below the transition point of the liquid crystal resin and above the melting temperature of the thermoplastic resin. By shaping, a shaped body (11) having a concave portion (12) was obtained. 2 and 3 show the shape of the shaped body (11).

A composite resin sheet for thermoforming having a predetermined thickness (10)
By shaping at the temperature as described above, without impairing the form of the liquid crystal fibers in the fibril state, it is possible to obtain a shaped body (11) having a desired shape by deforming only the thermoplastic resin of the matrix. it can.

(Function) According to the present invention, a blend of a liquid crystal resin and a thermoplastic resin is melt-kneaded at a temperature not lower than the transition point of the liquid crystal resin, and then melted at a temperature lower than the transition point of the liquid crystal resin. After forming into a sheet at a temperature not lower than the temperature, by cooling, a composite resin sheet for thermoforming in which a liquid crystal resin is dispersed in a fibril state in a thermoplastic resin of a matrix can be obtained.

The composite resin sheet for thermoforming is
By performing thermoforming at a temperature lower than the transition point of the liquid crystal resin as a component and at a temperature higher than the melting temperature of the thermoplastic resin, it is possible to obtain a sheet shaped body in which the thermoplastic resin of the matrix is reinforced with the liquid crystal resin in a fibril state.

[0064]

Next, examples of the present invention will be described together with comparative examples.

Example 1 Using the apparatus shown in FIG. 1, a composite resin sheet for thermoforming of the present invention was produced.

Liquid crystal resin (trade name: Rodrun LC-500)
0, transition point 280 ° C, manufactured by Unitika Ltd.), high-density polyethylene (manufactured by Mitsubishi Chemical Corporation, trade name HY540,
(Melting temperature 135 ° C) at the rate shown in Table 1
And mixed.

These resins were melt-kneaded with a twin-screw extruder (trade name: PCM-30, manufactured by Ikegai Kiko Co., Ltd.) (2) and extruded from a T-die (3) to obtain a sheet. Subsequently, the composite resin sheet for thermoforming (10) having a thickness of 2 mm was obtained by passing between two opposed cooling rolls (4) and (4). Table 2 shows the resin temperature in the barrel section (S1) of the extruder (2) and the resin temperature at the outlet of the T-die (3).

Further, the obtained composite resin sheet for thermoforming (1
A test sample was cut out from 0), and the tensile strength and the coefficient of linear expansion of the test sample were measured. The measurement results are shown in Table 3.

The tensile test was performed according to JIS K7113, and a No. 2 type test piece was used as the test piece. The coefficient of linear expansion is measured using TMA.
The following equation was used.

(L1-L0) / L0 / (T1-T0) L0: Sample length at the start of measurement L1: Sample length at the temperature after temperature rise T0: Temperature at the start of measurement T1: Temperature after temperature rise The composite resin sheet for thermoforming having a thickness of 2 mm (10)
At 180 ° C., which is below the transition point of the liquid crystal resin and above the melting temperature of the thermoplastic resin, into a bowl shape by press molding, and has a concave portion (12) shown in FIG. 2 and FIG. Form
(11) was obtained. A test sample was cut out from the flat portion of the concave portion (12) of the shaped body (11) made of the composite resin sheet for thermoforming (10), and the tensile strength and the coefficient of linear expansion of the test sample were measured. It described in. The measuring method is the same as the above method.

Examples 2 to 5 A composite resin sheet for thermoforming of the present invention was produced in the same manner as in Example 1 except that the types and the proportions of the resins used were changed as shown in Table 1.

Comparative Examples 1 and 2 For comparison, a composite resin sheet for comparison was produced in the same manner as in Example 1 except that the types and proportions of the resins used were changed as shown in Table 1.

Comparative Example 3 For comparison, a sheet extruded from a T-die was
Pass between two opposing cooling rolls, thickness 0.04mm
Example 1 except that a composite resin sheet for thermoforming was obtained.
Is the same as

Comparative Example 4 For comparison, a sheet extruded from a T-die was
It is the same as Example 1 except that the composite resin sheet for thermoforming having a thickness of 8 mm was obtained by passing between two opposed cooling rolls.

Comparative Examples 5 and 6 For comparison, except that the resin temperature in the barrel of the extruder and the resin temperature at the exit of the T-die were changed as shown in Table 2,
In the same manner as in Example 1, a composite resin sheet for thermoforming for comparison was produced.

Comparative Example 7 For comparison, a heat for comparison was prepared in the same manner as in Comparative Example 1 except that 30 parts by weight of glass fiber (manufactured by Nitto Boseki Co., Ltd., fiber diameter 10 μm, fiber length 5 mm) was added. A composite resin sheet for molding was produced.

In order to evaluate the performance of the thermoformed composite resin sheets obtained in Examples 2 to 5 and Comparative Examples 1 to 7, the thermoformed composite resin sheets and The tensile strength and the coefficient of linear expansion of the test sample of the shaped body were measured, and the measurement results are shown in Tables 3 and 4.

For all of the above Examples and Comparative Examples, the gel fraction after crosslinking of the obtained thermoforming composite resin sheet was measured. Table 5 shows the measurement results.

[0079]

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5] As is clear from the results of Tables 3 and 4, according to the composite resin sheet for thermoforming of the example of the present invention, the tensile strength was extremely large, and the composite resin sheet had sufficient strength and rigidity. Further, the linear expansion coefficient of the composite resin sheet for thermoforming according to the example of the present invention was very small, and was excellent in drawdown resistance and molding workability, and had high dimensional stability.

On the other hand, the composite resin sheet for thermoforming of the comparative example has a small tensile strength, does not have sufficient strength and rigidity, and has a large linear expansion coefficient, so that a dimensional change due to heating is large. Met.

As is clear from the results in Table 5 above,
According to the composite resin sheets for thermoforming of Examples 4 and 5 of the present invention, since the thermoplastic resin is composed of a non-crosslinked polyolefin resin and a crosslinkable polyolefin resin, the gel fraction after crosslinking is in a preferable range. It was.

[0082]

As described above, the composite resin sheet for thermoforming of the present invention has a liquid crystal resin of 0.1 to 50% by weight, a melting point or a melting temperature lower than the transition point of the liquid crystal resin, and A mixture of 50 to 99.9% by weight of a thermoplastic resin, wherein the liquid crystal resin is dispersed in the thermoplastic resin in a fibril state, and the sheet thickness is 0.1 to 5 mm. According to the composite resin sheet for thermoforming of the present invention, the fibrillated liquid crystal resin has high tensile strength and low linear expansion coefficient.

Since the liquid crystal resin can be re-melted, the composite resin sheet for thermoforming can be reused.

As described above, the method for producing a composite resin sheet for thermoforming according to the present invention has a liquid crystal resin of 0.1 to 50% by weight and a melting point or melting temperature lower than the transition point of the liquid crystal resin. After melt-kneading a mixed composition with 50 to 99.9% by weight of a thermoplastic resin at a temperature higher than the transition point of the liquid crystal resin, the sheet is melted at a temperature lower than the transition temperature of the liquid crystal resin and higher than the melting temperature of the thermoplastic resin. Since the sheet is obtained by shaping into a shape and further cooling to a temperature below the melting temperature of the thermoplastic resin, the resulting thermoformed composite resin sheet has the fibrillated liquid crystal resin oriented efficiently in the extrusion direction. Therefore, the strength and rigidity of the thermoforming composite resin sheet in the extrusion direction, that is, in the longitudinal direction, are greatly increased, and the obtained thermoforming composite resin sheet is provided with door pads, inside panels, bumper beams, and the like. As the auto parts, superior strength, the material of the component applications requiring stiffness, can be preferably used.

Further, in the method for producing a shaped body using the composite resin sheet for thermoforming of the present invention, as described above, the composite resin sheet for thermoforming is formed by melting the resin sheet below the transition point of the liquid crystal resin and the melting temperature of the thermoplastic resin. It is characterized by obtaining a shaped body by thermoforming as described above, and the shaped body of the obtained thermoformed composite resin sheet has a high tensile strength and a linear expansion coefficient because of the fibrillated liquid crystal resin. Low parts. In addition, since the liquid crystal resin can be re-melted, the shaped body of the composite resin sheet for thermoforming has an effect that it can be reused.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an apparatus for producing a composite resin sheet for thermoforming of the present invention.

FIG. 2 is an enlarged sectional view of a shaped body made from the composite resin sheet for thermoforming of the present invention.

FIG. 3 is an enlarged plan view of the same shaped body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hopper 2 Extruder 3 T die 4 Cooling roll 10 Composite resin sheet for thermoforming 11 Shaped object 12 Concave part

Claims (4)

[Claims] 1. A mixture of 0.1 to 50% by weight of a liquid crystal resin and 50 to 99.9% by weight of a thermoplastic resin having a melting point or melting temperature lower than the transition point of the liquid crystal resin. And a composite resin sheet for thermoforming, wherein the liquid crystal resin is dispersed in the thermoplastic resin in a fibril state, and the sheet thickness is 0.1 to 5 mm. 2. The composite resin sheet for thermoforming according to claim 1, wherein the thermoplastic resin comprises a non-crosslinked polyolefin resin and a crosslinkable polyolefin resin. 3. A mixed composition of 0.1 to 50% by weight of a liquid crystal resin and 50 to 99.9% by weight of a thermoplastic resin having a melting point or melting temperature lower than the transition point of the liquid crystal resin. After melt-kneading at a temperature equal to or higher than the transition point of the liquid crystal resin,
A composite resin sheet for thermoforming, which is shaped into a sheet at a transition temperature of a liquid crystal resin or lower, and at a melting temperature of a thermoplastic resin or higher, and further cooled to a melting temperature of the thermoplastic resin or lower to obtain a sheet. Manufacturing method. 4. The thermoforming composite resin sheet according to claim 1 or 2, wherein the thermoforming composite resin sheet is thermoformed at a transition temperature of a liquid crystal resin or lower and a melting temperature of a thermoplastic resin or higher. A method for producing a shaped body, comprising obtaining a shaped body.