JPH0957867A - Manufacture of plate-like resin molding with woodgrain pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a molding that thermal processing such as extrusion molding can be stably conducted even if the mixing amount of colored pellets is largely changed, the color tone or design of woodgrain pattern can be altered at the wide variety as required and has satisfactory physical properties such as excellent sense of beauty and rigidity. SOLUTION: The molding material that powder particle-like colored pellets made of resin composition filled with coloring material containing the same composition as the resin composition except that the coloring material is mixed is dispersively mixed with the resin composition obtained by mixing wood powder with vinyl chloride resin is obtained. The molding material is thermally molded to manufacture a plate-like resin molding P.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a plate-shaped resin molded product having a grain pattern such as a grain pattern or a straight grain pattern.

[0002]

2. Description of the Related Art Many methods have been proposed in the prior art for producing a plate-shaped resin molded product with a wood pattern used as various building materials by extrusion molding or the like. Among these, as a method for imparting a wood grain pattern with a coloring material, a base material made of a vinyl chloride resin composition is mixed with a small amount of colored pellets made of the coloring material-containing vinyl chloride resin composition to obtain a molding material,
A method for producing a plate-shaped resin molded product with a wood grain pattern by extruding the molding material is well known.

For example, Japanese Patent Publication No. 57-55735 discloses a method of using a molding material in which a base material and colored flaky pellets having different melt viscosities are mixed, and further, Japanese Patent Publication No. 63-53216. Discloses a method of using a molding material in which a base material is mixed with colored pellets composed of plural kinds of vinyl chloride resin compositions having different plasticizing temperatures.

As another method, there is known a method using a molding material in which a base material is mixed with colored pellets having a different degree of polymerization of a base resin.

Each of these manufacturing methods utilizes the difference in the flow characteristics between the base material and the colored pellets during thermoforming, that is, the coloring component (colored pellets) is added to the base material during thermoforming. The mixing is incompletely carried out so that the flow pattern due to the coloring component remains in the resin molded product to artificially give a wood grain pattern.

[0006]

However, in any of the above-mentioned manufacturing methods, the base material and the colored pellets made of the resin composition having a different component from the base material are mixed and extruded. There is a problem in the affinity between the resin compositions. Therefore, if the blending amount of the colored pellets is small, if the blending amount is still large, the flow characteristics of the molding material at the time of thermoforming will vary, stable thermoforming cannot be performed, and the molded product that has been subjected to the molding process is favorable. Physical properties cannot be obtained, and good aesthetics and sufficient mechanical strength cannot be obtained. Therefore, it is necessary to reduce the blending amount of the colored pellets, the color tone of the wood grain pattern and the types of patterns are limited, and there arises a problem that the color tone of the wood grain pattern, the pattern, and the like cannot be changed in various ways according to demand.

The present invention solves the above-mentioned problems of the prior art, enables stable thermal processing even when the blending amount of the coloring component is largely changed, and if necessary, the tone and pattern of the grain pattern can be varied over a wide range. An object of the present invention is to provide a method for producing a plate-shaped resin molded product with a wood grain pattern, which can be changed and can obtain a molded product having excellent physical properties excellent in aesthetics and rigidity.

[0008]

In order to achieve the above object, a method for producing a plate-shaped resin molded article with a wood pattern according to the present invention is a particle composite material comprising a resin composition in which wood powder is mixed with vinyl chloride resin. And a colored pellet made of a colorant-containing resin composition in which a colorant is mixed with the resin composition to obtain a molding material, and the molding material is heat-processed and molded to produce a plate-shaped resin molded article. Things are the gist.

In the present invention, a molding material is obtained by mixing colored composite particles of the vinyl chloride resin composition with colored pellets of the same composition as the above composition except that a coloring agent is blended. Because the molding material is heat-processed to produce a plate-shaped resin molded product, the affinity between the particle composite material and the colored pellets in the molding material is good, and even if the compounding amount of the colored pellets is large, the heat of the molding material is high. Stable thermal processing without deterioration of processing characteristics,
It is possible to obtain a molded product having excellent physical properties with excellent aesthetics and rigidity.

Further, since the colored pellets have a good affinity with the particle composite material, the compounding amount of the colored pellets is not limited, and by appropriately changing the compounding amount, the color tone and pattern of the wood grain pattern can be changed in various ways. Can be made.

The structure of the present invention will be described in detail below.

In the present invention, the particle composite material comprises a resin composition in which wood powder is mixed with vinyl chloride resin. The vinyl chloride resin used in the present invention has an average degree of polymerization of 600 to 1300, preferably a lower limit of 700 or more and an upper limit of 1100 or less. If this polymerization degree is too low, it is difficult to obtain a molded article with good physical properties such as a decrease in strength of the molded article. Conversely, if the polymerization degree is too high, the melting temperature during thermoforming is In addition, the melt viscosity becomes high and gelation failure occurs, making it difficult to perform stable thermoforming, which is not preferable.

As the wood powder, those having a water content of 1 to 5% can be preferably used, and particularly, the particle diameter is 1.0 μm to.
The one having 100 μm can be used more preferably. If a wood powder having a particle size of more than 100 μm is used, the melt viscosity of the molding material becomes excessively high, and gelation failure may occur, which may make it difficult to perform stable thermoforming.
It is not preferable to use wood powder having a particle size of less than 1.0 μm because it takes a lot of time and labor to pulverize the wood powder to less than 1.0 μm.

The amount of wood powder is 10 to 200 parts by weight, more preferably 30 parts by weight or more as the lower limit and 70 parts by weight or less as the upper limit, with respect to 100 parts by weight of the vinyl chloride resin. That is, if the blending amount of wood powder is too small, it is difficult to obtain a good wood texture in the obtained molded product. Conversely, if the blending amount is too large, the melt viscosity of the molding material becomes excessively high and stable. It may be difficult to perform the desired thermoforming,
Not preferred.

The resin composition as the particle composite material is
In addition to the above vinyl chloride resin and wood flour, well-known additives such as stabilizers, lubricants, modifiers, and plasticizers may be appropriately mixed.

In the present invention, the above resin composition is heat-kneaded and granulated into pellets, and a granular or powdery homogeneous mixture is used as the particle composite material.
The particle composite material of the present invention does not necessarily have to be granulated into powder and may be in the form of lumps or flakes.

As this particle composite material, a capillary rheometer (barrel diameter 9.55 mm, barrel total length 350) is used.
mm, barrel effective length 250 mm, capillary diameter 1.0
mm, capillary length 10 mm), the melt viscosity is 170 ° C., the shear rate is 91.2 sec.
^{In -1} , it is preferable to use one having a porosity of 1.0 × 10 ^{4 to} 10.0 × 10 ⁴ poise. If the melt viscosity is too low, the particle composite material and the colored pellets, which will be described later, are excessively kneaded at the time of thermoforming, and a good wood grain pattern cannot be developed, which is not preferable. On the other hand, if the melt viscosity is too high, poor gelling occurs, making it difficult to perform stable thermoforming, and the particle composite material and the colored pellets are not properly kneaded, resulting in a poor natural feeling. There is a possibility that a grain pattern may appear, which is not preferable.

The melt viscosity of the particle composite material is adjusted by the kind of the vinyl chloride resin as the matrix resin (degree of polymerization, etc.).
Alternatively, it can be performed by appropriately changing the kind and the amount of the additive.

The particle composite material has a gelation time of 100 to 400 seconds, more preferably a lower limit of 150.
It is preferable to use one having an upper limit of 200 seconds or more and 200 seconds or less. That is, if the gelation time is too fast, the particle composite material and the colored pellets are excessively kneaded at the time of thermoforming, and a good wood grain pattern cannot be developed, which is not preferable. On the other hand, if it is too slow, poor gelation will occur, making it difficult to perform stable thermoforming, and the kneading of the particle composite material and the colored pellets will not be carried out appropriately, resulting in a wood grain pattern with a poor natural feel. May appear,
Not preferred.

Here, the gelation time in the present invention means
Labo Plastomill "20C20" manufactured by Toyo Seiki Co., Ltd.
"0" means the time required to reach the maximum torque associated with gelation when 55 g of a measurement sample was kneaded at a temperature of 170 ° C and a rotation speed of 30 rpm. For reference, the gelation time is about 30 seconds in a normal vinyl chloride resin.

The gelling time of the particle composite material can be adjusted by appropriately changing the type of matrix resin (degree of polymerization, etc.), the type of additive material, and the amount added.

On the other hand, the colored pellets mixed in the particle composite material have the same composition as the above resin composition except that a coloring material such as a pigment is mixed (the mixing component and the mixing amount are the same). Stuff). As the colorant to be blended, a brown pigment or the like can be preferably used,
For example, a polymer azo pigment or the like can be exemplified as a suitable material.

The content of the colorant in the resin composition containing the colorant as the colored pellets is preferably about 0.5 to 20% by weight.

In the present invention, the resin composition containing the coloring material is kneaded by heating and granulated into a powdery or granular form to use a homogeneous mixture as a colored pellet.

The above-mentioned particle composite material (compound)
A homogeneous mixture obtained by blending a coloring agent with a mixture of the above and kneading again by heating and kneading may be used as the colored pellets.

The colored pellets thus produced have the same composition as the above-mentioned particle composite material except that a small amount of the coloring material is mixed therein, and therefore, the flow characteristics such as melt viscosity and gelation time are It is almost the same.

If the size (volume) of the colored pellets is large, a thick and high-contrast wood grain pattern appears in the molded product, while if the size (volume) is small, the wood grain is thin and the contrast is low. The pattern appears. However, in the present invention, the particle size of the colored pellet is not particularly limited, but in order to give a wood grain pattern full of natural feeling, the particle volume is 1 mm ³ to 1 mm ^3.
It is preferable to use the one with cm ³ .

In the present invention, the above particle composite material is
A dispersion pellet (dry blend) of colored pellets is used as a molding material.

The blending amount of the colored pellets at this time is not particularly limited, and even if the blending amount is large, there is no problem in molding processability and physical properties of the molded product as in the conventional case, but the molded product has a natural feeling. In order to give a wood grain pattern full of color, the blending amount of the colored pellets is 1 per 100 parts by weight of the particle composite material.
It is preferable to set to about 20 parts by weight, particularly preferably to set the lower limit value to 3 parts by weight or more and the upper limit value to 10 parts by weight or less.

In the present invention, the above-mentioned molding material can be molded by thermal processing well known in the plastics processing technology such as extrusion molding, calender molding, injection molding and the like to obtain a plate-shaped resin molded article, but particularly extrusion It is preferable to use molding.

For example, the above molding material is extruded by an extruder equipped with a T-shaped die to produce a plate-shaped resin molded product, or the above molding material is extruded into a tube shape by an extruder equipped with a round die. After molding, a method of producing a plate-shaped resin molded product by cutting and expanding the tubular extruded product along the extrusion direction is suitable.

In this extrusion molding, a colored component (colored pellet) is appropriately mixed with an uncolored component (particulate composite material), and the resin molded product is molded into a flow pattern, that is, a grain pattern. Add a pattern.

Here, the color tone and pattern of the wood pattern of the resin molded product can be changed by appropriately selecting the compounding amount and type of the colored pellets in the molding material.

For example, when a molding material containing a small amount of colored pellets having a small volume is used, the molded product (P) has a low contrast and the fine grain wood pattern (L) is coarse and dense as shown in FIG. 3 (a). In the case of adding a large amount of colored pellets having a small volume, the contrast is weak and the fine grain wood pattern (L) is finely applied, as shown in FIG. Colored pellets with a larger volume,
When a small amount is blended, the contrast is strong as shown in FIG. 6C, the thick grain wood pattern (L) is coarsely and densely added, and when a large amount of colored pellets are blended in a large amount, FIG. As shown in (d), the contrast is strong and the thick grain wood grain pattern (L) is densely applied.

Also, by changing the molding conditions such as the screw rotation speed of the extruder, it is possible to appropriately change the pattern of the grain pattern.

[0036]

EXAMPLES Next, examples related to the present invention, and comparative examples and reference examples for deriving the effects thereof will be described in detail.

<Materials used> PVC ... Polymerization degree 700, 800, 1100, 130
Five kinds of polyvinyl chloride of 0, 2600 ・ Wood powder: two types with an average particle size of 50 μm and one with a particle size of 150 μm ・ Modifier: "Metablene (trade name)" manufactured by Mitsubishi Rayon Co., Ltd. ・ Stabilizer Three types of tribasic lead sulfate (stabilizer 1), butyltin maleate polymer (stabilizer 2), butyltin laurate (stabilizer 3) ・ Lubricant: polyethylene wax (lubricant 1), stearic acid, fatty acid metal salt Such as fatty acid type (lubricant 2), calcium stearate (lubricant 3A), mixture of calcium stearate and zinc stearate (lubricant 3B),
Five types of mixed system of calcium stearate and lead stearate (lubricant 3C) -Coloring agent ... Polymer azo pigment <Thermal processing equipment> Extruder with T-die ... Biaxial extruder (55 mm diameter, L / D)
= 18) with a lip width of 550 mm and a T-type die attached.

Extruder with a round die: A twin-screw extruder similar to the above with a round die attached. However, as shown in FIG. 1 and FIG. 2, the circular die (10) has a spider in the middle of the maximum diameter portion of the annular resin flow passage (11) inside thereof and also has a zigzag shape in two rows inside and outside. A large number of shunt through-holes (21) with a thickness of 50m
The thing which incorporated the annular porous member (20) of m was used. In FIG. 1, (30) is an extruder, (31) is a screw, (32) is an adapter, and (33) is a mandrel or topede.

<Example 1>

[Table 1] As shown in Table 1 above, 100 parts by weight of PVC having a degree of polymerization (Pn) of 700, 50 parts by weight of wood powder having a particle size of 50 μm, 20 parts by weight of a modifier, 1 part by weight of a stabilizer (1), Lubricant (1)
Of 1 part by weight and 1 part by weight of the lubricant (2) were melt-kneaded and granulated to obtain a particle composite material having a melt viscosity of 7.6 × 10 ⁴ poise and a gelation time of 154 seconds. .

On the other hand, a resin composition containing a coloring material having the same composition as the above resin composition was melt-kneaded and granulated except that 10 parts by weight of a high molecular weight azo pigment was blended, and a melt viscosity of 7.6 × 1
Colored pellets having a poise of 0 ⁴ and a gelation time of 154 seconds were obtained.

[0041]

[Table 2] Then, as shown in Table 2 above, 100 parts by weight of the particle composite material was mixed with 3 parts by weight of the colored pellets (dry blending) to obtain a molding material.

Subsequently, the molding material was heated using the above-mentioned extruder equipped with a T-die at a hopper temperature of 170 ° C. and a cylinder outlet temperature of 1
70 ℃, adapter temperature 175 ℃, die temperature 175
Extrusion molding was carried out under the conditions of ° C and a screw rotation speed of 20 rpm to obtain a plate-shaped resin molded product.

The molded articles thus obtained were visually inspected, and in order from those similar to the grain of natural wood,
The evaluation was made in 5 grades as "5", "4", "3", "2" and "1". Those having an evaluation of 3 or more can be used as artificial wood products.

Further, the molded product was touched to evaluate whether it resembled the texture of wood or not, in the same manner as described above, in five levels.

Further, the finished condition of the surface of the molded product was evaluated in 5 steps in the same manner as above.

During extrusion molding, the stability during molding was evaluated on the basis of 5 grades as described above.

Example 2 As shown in Table 1 above, the degree of polymerization is 1
Melt viscosity of 8.2 × 10 ⁴ poise, gelation time 202 in the same manner as in Example 1 except that 100 PVC was used.
Seconds particle composites and colored pellets were obtained.

Subsequently, as shown in Table 2 above, the particle composite material 1
10 parts by weight of the colored pellets was mixed with 00 parts by weight to obtain a molding material, and extrusion molding was performed in the same manner as in Example 1 to obtain a molded product, and the same evaluation was performed.

Example 3 Particles having a melt viscosity of 9.7 × 10 ⁴ poise and a gelation time of 101 seconds were prepared in the same manner as in Example 1 except that the compounding agents shown in Table 1 were mixed in the proportions shown in the table. A composite material and colored pellets were obtained.

Then, as shown in Table 2 above, the particle composite material 1
20 parts by weight of colored pellets were mixed with 00 parts by weight to obtain a molding material, and extrusion molding was performed in the same manner as in Example 1 to obtain a molded product, and the same evaluation was performed.

Example 4 The particles having the melt viscosity of 8.0 × 10 ⁴ poise and the gelation time of 175 seconds were prepared in the same manner as in Example 1 except that the compounding agents shown in the above Table 1 were mixed in the proportions shown in the same table. A composite material and colored pellets were obtained.

Subsequently, as shown in Table 2 above, the particle composite material 1
30 parts by weight of the colored pellets were mixed with 00 parts by weight to obtain a molding material, and extrusion molding was performed in the same manner as in Example 1 to obtain a molded product, and the same evaluation was performed.

<Example 5> The compounding ingredients shown in Table 1 above were mixed in the proportions shown in the same table, and the melt viscosity,
A particle composite material and a colored pellet having a 7.8 × 10 ⁴ poise and a gelation time of 183 seconds were obtained.

Subsequently, as shown in Table 2 above, the particle composite material 1
50 parts by weight of the colored pellets were mixed with 00 parts by weight to obtain a molding material, and extrusion molding was performed in the same manner as in Example 1 to obtain a molded product, and the same evaluation was performed.

<Example 6> Particles having a melt viscosity of 8.7 x 10 ⁴ poise and a gelation time of 231 seconds were prepared in the same manner as in Example 1 except that the compounding agents shown in Table 1 were mixed in the proportions shown in the table. A composite material and colored pellets were obtained.

Then, as shown in Table 2 above, the particle composite material 1
3 parts by weight of the colored pellets were mixed with 00 parts by weight to obtain a molding material.

Then, the molding material was extruded into a tubular shape under the same conditions as above using the extruder with a round die,
The extruded product was cut open along the extrusion direction and expanded to obtain a plate-shaped resin molded product, and the same evaluation as above was performed.

<Example 7> The compounding ingredients shown in Table 1 above were blended in the proportions shown in the same table, and the melt viscosity was changed to 8.
A particle composite material and a colored pellet having 4 × 10 ⁴ poise and a gelation time of 162 seconds were obtained.

Subsequently, as shown in Table 2 above, the particle composite material 1
A molding material was obtained by mixing 10 parts by weight of the colored pellets with 00 parts by weight, and extrusion molding was performed in the same manner as in Example 6 to obtain a molded product, and the same evaluation was performed.

<Example 8> The compounding ingredients shown in Table 1 above were blended in the proportions shown in the same table, and the melt viscosity was changed to 7.
Particle composites and colored pellets with 6 × 10 ⁴ poise and gelation time of 197 seconds were obtained.

Subsequently, as shown in Table 2 above, the particle composite material 1
20 parts by weight of the colored pellets were mixed with 00 parts by weight to obtain a molding material, and extrusion molding was performed in the same manner as in Example 6 to obtain a molded product, and the same evaluation was performed.

Example 9 Particles having the melt viscosity of 8.8 × 10 ⁴ poise and the gelation time of 211 seconds were mixed in the same manner as in Example 1 except that the compounding agents shown in Table 1 were compounded in the proportions shown in the table. A composite material and colored pellets were obtained.

Subsequently, as shown in Table 2 above, the particle composite material 1
30 parts by weight of the colored pellets were mixed with 00 parts by weight to obtain a molding material, and extrusion molding was performed in the same manner as in Example 6 to obtain a molded product, and the same evaluation was performed.

Example 10 As shown in Table 1 above, the compounding agents shown in the table were blended in the proportions shown in the table, and the melt viscosity was 5.6 × 10 ⁴ poise and gel in the same manner as in Example 1. Conversion time 2
A 28 second particle composite and colored pellets were obtained.

Subsequently, as shown in Table 2 above, the particle composite material 1
80 parts by weight of the colored pellets were mixed with 00 parts by weight to obtain a molding material, and extrusion molding was performed in the same manner as in Example 6 to obtain a molded product, and the same evaluation was performed.

<Embodiment 11>

[Table 3] A resin composition prepared by mixing the compounding agents shown in Table 3 above in the ratio shown in the same table was melt-kneaded and granulated in the same manner as in Example 1 to obtain pellets having a melt viscosity of 13 × 10 ⁴ poise and a gelling time of 255 seconds. A particle-shaped composite material was obtained.

On the other hand, a colorant-containing resin composition having the same composition as the above resin composition was melt-kneaded and granulated to obtain a melt viscosity of 13 × 10 except that 10 parts by weight of a high molecular weight azo pigment was blended.
Colored pellets with ⁴ poise and gelation time of 255 seconds were obtained.

[0068]

[Table 4] Then, as shown in Table 4 above, 100 parts by weight of the particle composite material was mixed with 3 parts by weight of colored pellets (dry blending) to obtain a molding material, and extrusion molding was performed in the same manner as in Example 1 above to obtain a molded product. Then, the same evaluation was performed.

<Example 12> The compounding agents shown in Table 3 above were mixed in the proportions shown in the same table, and in the same manner as in Example 11, a particle composite material having a melt viscosity of 12 x 10 ⁴ poise and a gelation time of 68 seconds. And colored pellets were obtained as well as a molding material.

Using this molding material, a molded product was obtained in the same manner as in Example 1, and the same evaluation as shown in Table 4 was performed.

<Example 13> The compounding agents shown in Table 3 above were mixed in the proportions shown in the same table, and in the same manner as in Example 11, a particle composite material having a melt viscosity of 17 x 10 ⁴ poise and a gelation time of 274 seconds. And colored pellets were obtained as well as a molding material.

Using this molding material, a molded product was obtained in the same manner as in Example 1, and the same evaluation as shown in Table 4 was performed.

<Example 14> The compounding agents shown in Table 3 above were mixed in the proportions shown in the same table, and in the same manner as in Example 11, a particle composite material having a melt viscosity of 16 x 10 ⁴ poise and a gelation time of 306 seconds. And colored pellets were obtained as well as a molding material.

Using this molding material, a molded product was obtained in the same manner as in Example 1, and the same evaluation as shown in Table 4 was carried out.

<Example 15> The compounding agents shown in Table 3 above were mixed in the proportions shown in the same table, and in the same manner as in Example 11, a particle composite material having a melt viscosity of 16 x 10 ⁴ poise and a gelation time of 232 seconds. And colored pellets were obtained as well as a molding material.

Using this molding material, a molded product was obtained in the same manner as in Example 1, and the same evaluation as shown in Table 4 was performed.

Example 16 The particles having the melt viscosity of 8.6 × 10 ⁴ poise and the gelation time of 205 seconds were prepared in the same manner as in Example 11 except that the compounding agents shown in Table 3 were mixed in the proportions shown in the table. Composite materials and colored pellets were obtained, as were molding materials.

Using the molding material, a plate-shaped resin molded product was obtained in the same manner as in Example 6, and the same evaluations as above were performed as shown in Table 4 above.

Example 17 The particles having the melt viscosity of 9.7 × 10 ⁴ poise and the gelation time of 409 seconds were prepared in the same manner as in Example 11 except that the compounding agents shown in the above Table 3 were mixed in the proportions shown in the same table. Composite materials and colored pellets were obtained, as were molding materials.

Using the molding material, Example 16
A molded product was obtained in the same manner as above, and the same evaluation was performed as shown in Table 4 above.

<Example 18> The compounding agents shown in Table 3 above were mixed in the proportions shown in the same table, and in the same manner as in Example 11, a particle composite material having a melt viscosity of 19 × 10 ⁴ poise and a gelation time of 32 seconds. And colored pellets were obtained as well as a molding material.

Using the molding material, Example 16 was obtained.
A molded product was obtained in the same manner as above, and the same evaluation was performed as shown in Table 4 above.

Example 19 Particles having a melt viscosity of 7.7 × 10 ⁴ poise and a gelation time of 49 seconds were prepared in the same manner as in Example 11 except that the compounding agents shown in Table 3 were mixed in the proportions shown in the table. Composite materials and colored pellets were obtained, as were molding materials.

Using the molding material, Example 16 was obtained.
A molded product was obtained in the same manner as above, and the same evaluation was performed as shown in Table 4 above.

Example 20 The particles having the melt viscosity of 5.2 × 10 ⁴ poise and the gelation time of 442 seconds were prepared in the same manner as in Example 11 except that the compounding agents shown in Table 3 were mixed in the proportions shown in the table. Composite materials and colored pellets were obtained, as were molding materials.

Using the molding material, Example 16 was obtained.
A molded product was obtained in the same manner as above, and the same evaluation was performed as shown in Table 4 above.

<Comparative Example 1>

[Table 5] The compounding agents shown in Table 5 above were mixed in the proportions shown in the same table to obtain particle composite materials and colored pellets having melt viscosities greatly different from each other. Then, as shown in Table 6 below, 30 parts by weight of colored pellets were mixed with 100 parts by weight of the particle composite material to obtain a molding material, and the molding material was used to prepare Example 1
A plate-shaped resin molded product was obtained in the same manner as above, and the same evaluation as above was performed.

[0088]

[Table 6] <Comparative Example 2> The compounding agents shown in Table 5 above were mixed in the proportions shown in the same table to obtain particle composite materials and colored pellets having gelation temperatures greatly different from each other. And as shown in Table 6 above,
40 parts by weight of colored pellets were mixed with 100 parts by weight of the particle composite material to obtain a molding material. Using the molding material, a plate-shaped resin molded article was obtained in the same manner as in Example 1 and evaluated in the same manner as above. went.

<Comparative Example 3> As shown in Table 5 above, a particle composite material and colored pellets were obtained using a composition in which the degree of polymerization of the base material resin was significantly different from each other. Then, as shown in Table 6 above, 50 parts by weight of the colored pellets were mixed with 100 parts by weight of the particle composite material to obtain a molding material, and using the molding material, a plate-shaped resin molded product was obtained in the same manner as in Example 1. Then, the same evaluation as above was performed.

<Comparative Example 4> A molding material was obtained in the same manner as in Example 1 except that the amount of wood powder was 250 parts by weight, as shown in Tables 5 and 6 above. Then, the same evaluation was performed.

<Comparative Example 5> A molding material was obtained in the same manner as in Example 1 except that the amount of wood powder was 2 parts by weight, as shown in Tables 5 and 6 above. Then, the same evaluation was performed.

<Reference Example 1> A molding material was obtained in the same manner as in Comparative Example 1 except that the amount of the colored pellets mixed with the particle composite material was 3 parts by weight. Similar evaluation was performed.

Example 21 To 100 parts by weight of a particle composite material having the same composition as in Example 1, 5 parts by weight of a colored pellet having the same composition as in Example 1 was mixed to obtain a molding material, and the molding material was used. A plate-shaped resin molded product was obtained in the same manner as in Example 1.

<Example 22> 100 parts by weight of a particle composite material having the same composition as in Example 1 was mixed with 100 parts by weight of colored pellets having the same composition as in Example 1 to obtain a molding material, and the molding material was used. A plate-shaped resin molded product was obtained in the same manner as in Example 1.

Next, for each of the molded products of Examples 21 and 22, Comparative Example 1 and Reference Example 1, the presence or absence of a good wood grain pattern and JI
Impact strength according to SK7100 and ASTM D638
And the bending strength according to ASTM D790 were measured. The results are shown in Table 7 below.

[0096]

[Table 7] <Comprehensive Evaluation> As in Examples 1 to 22 according to the present invention,
When a colored pellet having substantially the same composition as that of the particle composite material is used, even if the blending amount of the colored pellet is changed, stable thermal processing can be performed, and a molded product having good physical properties can be obtained. it can. In particular, when a resin composition having a specific melt viscosity, a specific gelation time, or the like is used as the resin composition for the molding material as in Examples 1 to 10 and 21, 22, the thermal processing is further stabilized. Therefore, a molded product having more excellent physical properties can be obtained.

On the other hand, if the content of the colored pellets is small (Reference Example 1), it is possible to obtain predetermined heat processability and physical properties, but the colored pellets are out of the scope of the present invention. Containing a large amount of (Comparative Examples 1 to 3)
In addition, in the case where the blending amount of the wood powder deviates from the specific range (Comparative Examples 4 and 5), the heat processability, the physical properties and the like were deteriorated.

[0098]

As described above, according to the method for producing a plate-shaped resin molded product with a wood pattern according to the present invention, a molding material in which a particle composite material and a colored pellet having substantially the same composition as that of the composite material are mixed, Since it is heat-processed and molded, it has a good affinity between the particle composite material and the colored pellets, and can be stably heat-processed even if the blending amount of the colored pellets is greatly changed. There is an effect that the pattern and the like can be changed in a wide variety and a molded product having excellent physical properties excellent in aesthetics and rigidity can be obtained.

In the present invention, when the resin composition constituting the particle composite material and the colored pellets having a specific melt viscosity or having a specific gelation time is used, the above-mentioned effects are further improved. There is an advantage that it can be surely obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing the periphery of a die part of an extrusion molding apparatus used in an embodiment of the present invention.

FIG. 2 is a front view showing an annular porous member mounted on the die of the embodiment.

FIG. 3 is a plan view showing an example of a molded product that has been heat processed in connection with the manufacturing method of the present invention.

[Explanation of symbols]

 L: wood grain P: molded product

Claims (3)

[Claims] 1. A particle composite material made of a resin composition containing vinyl chloride resin mixed with wood powder, and colored pellets made of a resin composition containing a coloring material containing a coloring material mixed with the resin composition are mixed. A method for producing a plate-shaped resin molded article with a wood pattern, which comprises obtaining a molding material by heat processing and molding the molding material to produce a plate-shaped resin molded article. 2. The resin composition has a melting temperature of 170 ° C.,
The melt viscosity at a shear rate of 91.2 sec ⁻¹ is 1.
The method for producing a plate-shaped resin molded article with a wood pattern according to claim 1, which has a porosity of 0 × 10 ^{4 to} 10.0 × 10 ⁴ . 3. The gel time of the resin composition is 100.
The method for producing a plate-shaped resin molded article with a wood pattern according to claim 1 or 2, wherein the time is from 400 sec.