JP2001205751A - Thermoplastic composite material molded object and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic composite material molded object highly filled with a vegetable filler, excellent in durability and especially reduced in discoloration and fading even if exposed to the open air over a long period of time and a method of manufacturing the same. SOLUTION: The thermoplastic composite material molded object 8 is constituted by forming a coating layer comprising a thermoplastic resin on the surface of a core layer comprising a thermoplastic composite material containing the vegetable filler in an amount of 50-90 weight % per the sum total amount of a thermoplastic resin and the vegetable filler. This molded object 8 is manufactured by successively supplying the thermoplastic composite material containing the vegetable filler in an amount of 50-90 weight % per the sum total amount of a thermoplastic resin and the vegetable filler to the heating shaping mold 2 connected to an extruder, the cooling mold 3 directly connected to the heating shaping mold and the surface heating mold 3 directly connected to the cooling mold to shape the core layer and supplying the thermoplastic resin to the heating coating mold 6 directly connected to the surface heating mold to form the coating layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a molded article of a thermoplastic composite material and a method for producing the same. More specifically, the present invention relates to a thermoplastic composite material molded article having good durability and usable as synthetic wood, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, various attempts have been made to obtain a molded article having a woody feel by extrusion molding a composite resin composition in which a plant-based filler such as wood powder is mixed into a thermoplastic resin. Have been. For example, Japanese Unexamined Patent Publication No. 7-266313 discloses a woody synthetic powder obtained by mixing and gelling and kneading 80 to 25% by weight of a thermoplastic resin molding material with 20 to 75% by weight of a cellulosic crushed product to form a sized product. An extruded wood composite board is disclosed.

[0003]

However, the amount of the plant-based filler is increased so much as to emphasize the feeling of wood, and as described in the above-mentioned publication, about 75% by weight of the plant is added to the total amount of the thermoplastic resin. According to the study of the present inventors, a thermoplastic composite material molded article formed by simply highly filling a system filler has a problem in durability performance, and is unsatisfactory as an actual building material. Specifically, when such a molded article was subjected to an outdoor exposure test, discoloration was observed in a short period of time.

[0004] This is considered to be due to the elution of colored trace components such as lignin and hemicellulose contained in the plant filler. The present invention has been made in view of the problems of the above-mentioned conventional thermoplastic composite material molded article, and is highly filled with a plant-based filler such as wood flour, and has excellent durability. It is an object of the present invention to provide a thermoplastic composite material molded article which has little discoloration even when exposed.

[0005]

In order to achieve the above object, the invention according to claim 1 is characterized in that the plant-based filler is 50 to 90% by weight based on the total amount of the thermoplastic resin and the plant-based filler. The present invention provides a thermoplastic composite material molded product, characterized in that a coating layer made of a thermoplastic resin is formed on the surface of a core layer made of a thermoplastic composite material containing:

According to a second aspect of the present invention, there is provided the molded thermoplastic composite material according to the first aspect, wherein the thermoplastic resin of the core layer is a polyolefin. In the invention according to claim 3, the thickness of the coating layer is 0.1 to 0.5 mm.
The thermoplastic composite material molded product according to claim 1 or 2, which is:

According to a fourth aspect of the present invention, there is provided the thermoplastic composite material molded product according to any one of the first to third aspects, wherein the thermoplastic composite material molded product is a heteromorphic form. In the invention according to claim 5, the core layer and the coating layer have the same type of thermoplastic resin.
4. A thermoplastic composite material molded article according to any one of 4) is provided.

According to a sixth aspect of the present invention, a thermoplastic composite material containing 50 to 90% by weight of a plant filler based on the total amount of a thermoplastic resin and a plant filler is connected to an extruder. The heating shaping mold, the cooling mold directly connected to the heating shaping mold, and the surface heating mold directly connected to the cooling mold are supplied in this order to form the core layer, and further, to the surface heating mold. A method for manufacturing a thermoplastic composite material molded article according to claim 1, wherein a thermoplastic resin is supplied to a directly-connected heat coating mold to form a coating layer. Hereinafter, the present invention will be described in more detail.

The thermoplastic resin used in the thermoplastic composite material for the core layer in the present invention includes polyolefin such as polyethylene and polypropylene, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, fluororesin, polyphenylene sulfide, and the like. Commercially available thermoplastic resins such as polystyrene, acrylonitrile-butadiene-styrene resin (ABS resin), acrylic resin, polycarbonate, polyurethane, polyvinyl chloride, polyphenylene oxide, and ethylene-vinyl acetate copolymer are exemplified.

In particular, as described in claim 2, a polyolefin resin such as polyethylene or polypropylene is preferably used from the comprehensive viewpoint of physical properties such as moldability and chemical resistance and costs. If necessary, recycled materials of the above-mentioned thermoplastic resin (plastic products, burrs generated during molding, so-called loss raw materials generated up to regular production, etc.) may be used.

The type of the plant-based filler used in the present invention is particularly limited as long as the resulting molded article has a plant-like appearance and gives a soft touch, and is a plant-based filler. Not something. For example, timber, wood board, plywood,
Wood chips such as cutting waste such as pulp and bamboo, abrasive dust, cutting sawdust, and pulverized materials; grain or fruit shells such as rice hulls and walnut shells and pulverized materials thereof;

A coating layer made of a thermoplastic resin is coated on the surface of a core layer made of a thermoplastic composite material containing 50 to 90% by weight of a plant-based filler with respect to the total amount of the thermoplastic resin and the plant-based filler. A molded thermoplastic composite material characterized by being formed. The content of the plant-based filler is from 50 to 90% by weight, and preferably from 55 to 80% by weight, based on the total amount of the above-mentioned thermoplastic resin. If the amount is less than 50% by weight, the woody feeling is reduced. If the amount is more than 90% by weight, the dispersibility in the thermoplastic resin starts to be reduced, and the physical properties may be reduced.
The particle size of the plant-based filler can be generally 1 to 1000 μm, but is preferably 10 to 300 μm. If it is smaller than 1 μm, it is difficult to uniformly disperse it, and if it is larger than 1000 μm, the grains are conspicuous and a woody appearance is hardly developed.

The plant-based filler is usually 5 to 10% by weight.
Since it contains a certain amount of water, it is preferable to dry in advance in an oven or the like, or to deaerate as steam by a deaeration vent during extrusion molding.

As for the thermoplastic resin forming the coating layer, any of the thermoplastic resins used for the thermoplastic composite material for the core layer has a certain degree of suitability for suppressing the deterioration of weather resistance during outdoor exposure. More preferably, an acrylic resin represented by polymethylene methacrylate is used. If fusion of the thermoplastic resin for the core layer and the thermoplastic resin forming the coating layer is difficult, an intermediate layer may be provided.

For example, when polypropylene is used as the thermoplastic resin for the core layer and polymethylene methacrylate is used as the thermoplastic resin for forming the coating layer, both have low affinity and the formation of the coating layer is not easy. By providing an intermediate layer such as an acid-modified polypropylene having a high affinity with the core layer, a coating layer tightly integrated with the core layer is formed. In order to provide the intermediate layer, it is possible to directly connect another heating coating die after the heating coating die directly connected to the surface heating die.

It is preferable that the core layer and the coating layer have the same type of thermoplastic resin from the viewpoint of recyclability of the obtained molded article. Furthermore, when using a polyolefin resin as the resin of the core layer,
Since the polyolefin resin has poor polarity, it is preferable that the resin forming the coating layer be of the same type in terms of the adhesion of the coating layer.

The coating layer may cover the entire surface of the core layer, but may cover only a necessary portion. When the thermoplastic composite material molded article of the present invention is produced by extrusion molding, usually, a surface perpendicular to the extrusion direction is not provided with a coating layer. The thickness of the coating layer is not particularly limited.
As mentioned, 0.1 to 0.5 mm is preferred. 0.5m
If it exceeds m, the feeling of plasticity on the surface will increase, and the apparent woody feeling will decrease. If it is less than 0.1 mm, it will be difficult to produce a molded article. However, the thickness of the coating layer is within this range,
It is preferable that the thickness be as thin as possible.
０．３0.3 mm.

If necessary, reinforcing materials such as glass fibers and carbon fibers, plasticizers for improving moldability (such as αβ unsaturated carboxylic acid monomers and low molecular weight olefins), and improvers for moldability. Lubricant (stearic acid, stearic acid metal salt, etc.), UV absorber to improve durability such as weather resistance, UV deterioration inhibitor, antioxidant deterioration agent, and to enhance design and give wood texture and woodgrain Pigments, flame retardants that impart flame retardancy, etc., acid-modified olefins for improving the affinity between thermoplastic resins and plant-based fillers, low-molecular-weight acid-modified olefins (eg, Sanyo Kasei's “Umex” series) It is also possible to incorporate additives such as the above into the core layer and / or the coating layer. In particular, when additives such as an ultraviolet absorber, an ultraviolet deterioration inhibitor, and an oxidation deterioration inhibitor are blended only in the coating layer, an effective improvement in performance and cost can be expected.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for producing a thermoplastic composite material molded article of the present invention by using the above-mentioned raw materials by the production method according to claim 6 will be described below with reference to the drawings as necessary. FIG. 1 is a schematic side view showing one embodiment of an extrusion molding apparatus suitable for use in carrying out the present invention.
An extruder 1 such as a twin-screw co-extruder is an extruder for shaping a core layer of a thermoplastic composite material molded body 8, and a heating shaping mold 2 is connected to the downstream side thereof via an adapter. The cooling die 3 is directly connected to the heating shaping die 2, the surface heating die 4 is directly connected to the cooling die 3, and the heating coating die 6 of the crosshead is directly connected to the surface heating die 4, and the coating is performed. An extruder 5 for extruding the thermoplastic resin for a layer is connected to a heat coating mold 6 to constitute an extrusion molding device 7.

The thermoplastic composite material for the core layer supplied to the extruder 1 is heated and kneaded and then shaped by a heating shaping mold 2, and the shaped shape is cooled by a cooling mold 3. After being solidified, the surface is heated by the surface heating mold 4, and further, while being fed to the heating coating mold 6, is coated with the thermoplastic resin for the coating layer extruded from the extruder 4, and the coating layer is formed. The formed thermoplastic composite material molded article 8 of the present invention is manufactured.

In the method of the present invention, the above-mentioned thermoplastic composite material is heated, kneaded and extruded by, for example, the following method. 1. A thermoplastic composite material for a core layer containing a thermoplastic resin and a plant-based filler is directly charged into an extruder, and extruded as it is while heating and kneading. 2. The mixture is heated and kneaded with an extruder, and once pellets are formed, extrusion molding is performed using the obtained pellets. 3. The mixture is heated and kneaded in a batch facility such as a super mixer to produce pellets, and then extruded using the pellets.

When extruding, the extruder is a commercially available single-shaft,
It can be used widely from general extruders such as co-axial twin screw and counter-directional twin screw to special extruders such as planetary screw extruders and KCK containerian mixers. In the above method 1, it is preferable to use an extruder having a large kneading effect, such as a twin-screw kneading extruder. In the above method 2 or 3 in which the blend is pelletized in advance, it is preferable to use a single-screw, twin-screw, or other ordinary extruder. As the extruder for the thermoplastic resin for the coating layer, any of the above can be used, but from the viewpoint of operability, a single-screw extruder having a small diameter is convenient.

The plant-based filler usually contains about 5 to 10% of water, and is dried in an oven or the like in advance.
Alternatively, it is preferable to remove air by degassing from the vent during extrusion molding. Further, in the above manufacturing method, it is necessary that the heating shaping die and the cooling die, the cooling die and the surface heating die, and the surface heating die and the heating coating die are directly connected in the molding apparatus. This is because the direct connection of the molds makes it possible to form a coating layer by supplying a thermoplastic resin to the core layer highly filled with the plant-based filler.

In particular, when an attempt is made to obtain a thermoplastic composite material molded article having an irregularly shaped cross-sectional shape as described in claim 4, the core layer highly filled with a plant-based filler is preferably used. It has been considered difficult to coat the thermoplastic resin uniformly, but by directly connecting the mold, the thermoplastic composite material molded article of the present invention can be obtained.

The inner surfaces of all the above dies are preferably smooth, and more preferably, are subjected to plating, Teflon coating, or the like. The plating process
The type is not particularly limited as long as it is smooth, but chrome plating or the like is preferable in terms of cost. It is preferable that the cooling mold 3 and the surface heating mold 4 have the same shape as the heating shaping mold 2. If the shapes are not the same, the back pressure in the mold increases, and the extrusion amount cannot be sufficiently increased.

The heat coating mold has a shape in which the entire surface of the extruded product obtained by the heat shaping mold or a necessary surface portion is enlarged by the thickness of the coating resin.
The inner surface of the heat-coating mold has a constant cross-sectional shape in the extrusion direction. Although the length in the extrusion direction (lip) of the heat shaping mold depends on the shape of the extruded product, it can be easily extruded if it is about 3 to 100 mm. If it is less than 3 mm, it is difficult to uniformly coat the entire surface of the extruded product (especially a complicatedly shaped product). If it is more than 100 mm, the back pressure in the tip mold increases, and the amount of extrusion decreases.

The coating resin is supplied to the surface of the core layer through the coating resin passage 10 provided in the heating coating die 6 directly connected to the surface heating die 4. In the case of forming and laminating a plurality of coating layers, it is possible to directly connect another heating coating type after the cooling type, the surface heating type, and the heating type.

The molded article of the thermoplastic composite material of the present invention is a material for a wide range of uses as various building materials, furniture materials, equipment parts and the like. For example, a thin thermoplastic composite material molded article can be used as a building material such as a decorative board for interior decoration of a house.

(Function) The molded article of the thermoplastic composite material according to claim 1 is 50 to 90 with respect to the total amount of the thermoplastic resin.
The coating layer made of thermoplastic resin is formed on the surface of the core layer while containing a high-filled plant-based filler by weight, so that the colored trace components contained in the plant-based filler are eluted. This is presumed to be able to block the occurrence of discoloration, but it has a great practical advantage that discoloration does not occur even when outdoor exposure is performed for a long period of time.

In the conventional method of extrusion molding of a thermoplastic resin, a heating molding die and a cooling molding die connected to an extruder are separated from each other. There are many methods, and in this case, when the resin comes out of the heat shaping mold, the mold is not restrained, and it is difficult to maintain molding conditions with delicate or complicated shapes. On the other hand, in the method for producing a thermoplastic composite material molded body according to the sixth aspect, in a molding apparatus, a heating shaping mold and a cooling mold, a cooling mold and a surface heating mold, and a surface heating mold and a heating coating mold are directly connected. This makes it possible to easily extrude a uniform, thin-walled resin onto a core layer that is highly filled with a plant-based filler, which has been difficult with the prior art. In particular, in the case of producing a deformed shaped body as described in claim 4, in a thermoplastic composite material in which a plant-based filler is highly filled in the thermoplastic resin used in the present invention, the viscosity of the material itself is poor, and The tendency is more pronounced, and it is even difficult to obtain molded articles with the prior art, but according to the present invention, the coating of the thermoplastic resin is completed in a completely directly connected (restrained) mold. Even if it is a thermoplastic composite material having almost no viscosity, the dimensional reproduction accuracy of the mold shape is high, and even a large cross section or a complicated irregular shape can be uniformly coated.

(Example 1) Homopolypropylene (Novatec MA, manufactured by Nippon Polychemical Co., Ltd.) was used as a thermoplastic resin.
3) 100 parts by weight, wood flour as a plant-based filler (cellulosin No. 45, manufactured by Watanabe Chemical Co., average particle size 100 μm)
A barrel temperature of 18 parts by weight of 300 parts by weight and 5 parts by weight of zinc stearate (SZ2000, manufactured by Sakai Chemical Co., Ltd.) was used as a lubricant using a twin-screw co-extruder (PCM30, manufactured by Ikegai Kiki).
The mixture was heated and kneaded at 0 ° C. to form pellets.

The pelletized raw material is converted into a single extruder 1
(SLM50, Hitachi Zosen), the extruder 7 shown in FIG. 1 and the heating shaping die 2 (6 ×
60 mm rectangular section), cooling mold 3 and surface heating mold 4 (6
× 60 mm rectangular cross section), cross-head heat coating mold 6
(A rectangular cross section of 6.4 × 60.4 mm) and an extruder 5 were used for extrusion molding.

As shown in FIG. 2, a single extruder (VS30, manufactured by Ikegai Kikai Co., Ltd.) was used to coat polymethylene methacrylate (LG6, manufactured by Sumitomo Chemical Co., Ltd.) on the heating coating mold 6 as shown in FIG. The core layer was extruded and coated over the entire circumference in the longitudinal direction of the core layer through the passage 10 to obtain a thermoplastic composite material molded body 8 having a rectangular cross section.

(Example 2) Heating mold 2 shown in FIG.
(Irregular shape), cooling mold 3 (irregular shape), surface heating mold 4
After extruding and shaping the core layer using the (irregular shape), the coating resin supplied from the extruder 5 shown in FIG. 1 was extrusion-coated using a crosshead heating coating mold 6 (irregular shape). Except for the above, a molded article of a thermoplastic composite material having an irregular cross section was obtained in the same manner as in Example 1.

(Embodiment 3) Using each mold shown in FIG.
A molded article of a thermoplastic composite material having an irregular cross section was obtained in the same manner as in Example 1 except that homopolypropylene (Novatec MA3, manufactured by Nippon Polychemical Co., Ltd.) was used as the resin for forming the coating layer.

(Embodiment 4) Using each mold shown in FIG.
Example 1 was repeated except that homopolypropylene (Novatec MA3, manufactured by Nippon Polychemicals Co., Ltd.) and a weather resistance improver (AL103, manufactured by Matsuura Chemical Co., 1% by weight based on homopolypropylene) were used as the resin for forming the coating layer. In the same manner as in Example 1, a molded article of a thermoplastic composite material having an irregular cross section was obtained.

(Comparative Example 1) As a thermoplastic resin, homopolypropylene (manufactured by Nippon Polychemical Co., Ltd., Novatec MA)
3) 100 parts by weight, wood flour as a plant-based filler (cellulosin No. 45, manufactured by Watanabe Chemical Co., average particle size 100 μm)
300 parts by weight and 5 parts by weight of zinc stearate (SZ2000, manufactured by Sakai Chemical Co., Ltd.) were used as a lubricant by using a twin-screw co-extruder (PCM30, manufactured by Ikegai Kiki Co., Ltd.) at a barrel temperature of 18%.
The mixture was heated and kneaded at 0 ° C. to form pellets.

The pelletized raw material is charged into a single extruder (SLM50, Hitachi Zosen), and only the heating mold 2 (6 × 60 mm rectangular cross section) and the cooling mold 3 shown in FIG. Extrusion molding was performed without using a heating mold and a heating coating mold. The obtained molded article corresponded to the molded article of the thermoplastic composite material obtained in Example 1 in which the coating layer was not formed on the surface.

(Comparative Example 2) As a thermoplastic resin, a homopolypropylene (Novatec MA, manufactured by Nippon Polychemical Co., Ltd.)
3) 100 parts by weight, wood flour as a plant-based filler (cellulosin No. 45, manufactured by Watanabe Chemical Co., average particle size 100 μm)
300 parts by weight and 5 parts by weight of zinc stearate (SZ2000, manufactured by Sakai Chemical Co., Ltd.) were used as a lubricant by using a twin-screw co-extruder (PCM30, manufactured by Ikegai Kiki Co., Ltd.) at a barrel temperature of 18%.
The mixture was heated and kneaded at 0 ° C. to form pellets.

The pelletized raw material is converted into a single extruder 1
(SLM50, Hitachi Zosen) and the extrusion molding apparatus shown in FIG.
(6 × 60 mm rectangular cross section) was extruded using the separated heat-coating mold 6, cooling tank 11, and take-off machine 12.

As shown in FIG. 5, a single extruder (VS30, manufactured by Ikegai Kikai Co., Ltd.) was used to coat polymethylene methacrylate (LG6, manufactured by Sumitomo Chemical Co., Ltd.) on the heating coating mold 6 as shown in FIG. The core layer was extruded and coated through the passage 10 so that the coating thickness became 0.2 mm over the entire circumference in the longitudinal direction of the core layer, to obtain a thermoplastic composite material molded article having a rectangular cross section.

The molded articles having a length of 1 m obtained in the above Examples and Comparative Examples were exposed outdoors for 1 year as samples, and the color difference (ΔE) before and after the outdoor exposure was evaluated. The evaluation results are shown in Table 1.

[0043]

[Table 1]

[0044]

The thermoplastic composite material molded article of the present invention contains 50 to 90% by weight of a high-filled plant-based filler based on the total amount of the thermoplastic resin, and the core layer of the molded article. Since a coating layer made of a thermoplastic resin is formed on the surface, there is no elution of colored trace components contained in the plant-based filler, and there is no discoloration and discoloration even after long-term outdoor exposure, and excellent durability. ing. Therefore, it can be used especially as a building material as synthetic wood having good durability. In the invention according to claim 2, since the thermoplastic resin of the core layer is a polyolefin,
We can propose cheaper building materials and environmentally friendly building materials. In the invention according to claim 3, the coating layer has a thickness of 0.1 to 0.1.
Since it is 0.5 mm, the appearance of the wooden texture is not impaired. The invention according to claim 4 is a dysplastic form,
It is possible to propose a building material for a wider use. According to the fifth aspect of the present invention, the core layer and the coating layer have the same type of thermoplastic resin, so that the core layer and the coating layer can have excellent recyclability. The method for producing a thermoplastic composite material molded body according to claim 6 is a conventional method by directly connecting a heating shaping mold and a cooling mold, a cooling mold and a surface heating mold, and a surface heating mold and a heat coating mold in a molding apparatus. Uniform, thin,
The formation of the coating layer by the thermoplastic resin can be easily achieved.
In particular, it was difficult to obtain a molded product by the prior art even if the deformed shaped body as described in claim 4 is used, but when the manufacturing method according to claim 6 is applied, even if the thermoplastic composite material has almost no viscosity, It is effective to obtain a thermoplastic composite material molded article having a uniform coating layer even if the mold has a high dimensional reproduction accuracy and a large cross section or a complicated irregular shape. .

[Brief description of the drawings]

FIG. 1 is a schematic side view showing one embodiment of an extrusion molding apparatus suitable for use in carrying out the present invention described in claim 6.

FIGS. 2A and 2B are cross-sectional views showing one form of each mold in the apparatus shown in FIG. 1, wherein FIG. 2A shows a heating shaping mold, FIG. 2B shows a surface heating mold, and FIG. .

3A and 3B are cross-sectional views showing another form of each mold in the apparatus shown in FIG. 1, wherein FIG. 3A is a heating shaping mold, FIG. 3B is a surface heating mold, and FIG. Represents

FIG. 4 is a schematic side view showing one embodiment of an extrusion molding apparatus used in Comparative Example 2.

5 is a cross-sectional view showing one form of each mold in the apparatus shown in FIG. 4, wherein (a) shows a heating shaping mold, (b) shows a surface heating mold, and (c) shows a heating coating mold. .

[Explanation of symbols]

 1. Extruder 2. Heat shaping mold 3. Cooling shaping mold 4. Surface heating mold 5. Extruder 6. Heat coating mold 7. Extrusion molding equipment 8. Thermoplastic composite material molding Body 10 ・ ・ Resin passage for coating 11 ・ ・ Cooling tank 12 ・ ・ Retractor

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29K 511: 14 B29K 511: 14 B29L 9:00 B29L 9:00 31:10 31:10 F term (reference) 4F100 AK01A AK01B AK03A AK07 AK25 AP00H BA02 CA23 DA16 DE01A DE01H EH17 GB07 JB16A JB16B JL00 JL09 YY00B 4F207 AA11 AA21 AB20 AG03 AH47 KA01 KA14 KA20 KB13 KB26 KE06 KE09 KJ01 KE06 KE09 KF01

Claims (6)

[Claims] 1. A coating made of a thermoplastic resin on a surface of a core layer made of a thermoplastic composite material containing 50 to 90% by weight of a plant filler based on the total amount of the thermoplastic resin and the plant filler. A molded article of a thermoplastic composite material, wherein a layer is formed. 2. The thermoplastic composite material molded article according to claim 1, wherein the thermoplastic resin of the core layer is a polyolefin. 3. The molded thermoplastic composite material according to claim 1, wherein the thickness of the coating layer is 0.1 to 0.5 mm. 4. The thermoplastic composite material molded article according to claim 1, which is a heteromorphic form. 5. The molded thermoplastic composite material according to claim 1, wherein the core layer and the coating layer are of the same type of thermoplastic resin. 6. A heating shaping die connected to an extruder, wherein a thermoplastic composite material containing 50 to 90% by weight of a plant-based filler based on the total amount of the thermoplastic resin and the plant-based filler is heated. A cooling mold directly connected to the shaping mold, and a surface heating mold directly connected to the cooling mold are supplied in this order to form the core layer, and further, a heating coating mold directly connected to the surface heating mold. The method for producing a molded thermoplastic composite material according to claim 1, wherein the coating layer is formed by supplying a thermoplastic resin.