JPH11279416A - Thermoplastic resin composition - Google Patents

Abstract

(57) [Problem] To provide a thermoplastic resin composition containing wood powder, which can be easily molded, has a large impact strength, and can provide a molded article having an excellent woody feel. (A) Per 100 parts by weight of a thermoplastic resin,
(B) 5 to 150 parts by weight of wood powder having an average particle size of 30 to 500 μm, and (C) 5 to 700 μm in diameter and 2 to 50 mm in length
A thermoplastic resin composition characterized by comprising 0.5 to 50 parts by weight of a fiber having a softening temperature of 5 to 50 ° C. higher than the processing temperature of the thermoplastic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a thermoplastic resin composition. More specifically, the present invention relates to a thermoplastic resin composition containing wood powder, which can be easily molded, has a high impact strength, and can provide a molded article having an excellent woody feel.

[0002]

2. Description of the Related Art Wood can be repeatedly produced by photosynthesis.
Attempts are being made to reduce the concentration of carbon dioxide in the atmosphere to regenerate a healthy global environment, while at the same time planning to cut down and use wood as a resource for human life. Under such circumstances, if a resin composition that is easily used in molding materials can be developed by blending wood powder with a thermoplastic resin that is easy to mold and have high mechanical strength, a harmonious global The path of resource utilization will be greatly pioneered. 2. Description of the Related Art Conventionally, for the purpose of producing an appearance and a tactile sensation similar to wood, molding is often performed by blending wood powder with a thermoplastic resin.
However, a thermoplastic resin composition containing a considerable amount of wood flour,
Since the mechanical strength such as impact resistance is greatly reduced, various remedies have been attempted. For example, JP-A-58-20
No. 4050 discloses a white background resin molded product having a low expansion coefficient, low distortion, excellent abrasion characteristics and excellent flexural strength characteristics.
After hardening, cutting and crushing the wood-based powder obtained,
After bleaching with a bleaching agent, 3-50
% Has been proposed.
However, this molded product not only has a long manufacturing process but also cannot exhibit a soft woody feeling. JP-A-60-18844
No. 5 and Japanese Patent Application Laid-Open No. Sho 60-192746 disclose a molded article having a low linear expansion coefficient, excellent physical properties, and a woody appearance, in a vinyl chloride resin, glass short fibers or mica, wood powder. There has been proposed a vinyl chloride resin molded product in which a modifier such as chlorinated polyethylene is dispersed.
However, since the vinyl chloride resin molded product accumulates heat inside during molding and generates hydrogen chloride gas by thermal decomposition to generate bubbles, it is difficult to mold a thick product having a thickness of 1 cm or more.
Further, Japanese Patent Application Laid-Open Nos.
No. 105053 discloses a polyolefin resin as a thermoplastic resin composition having excellent thermoformability and mechanical strength.
A resin composition in which wood flour is blended together with an inorganic filler by utilizing the compatibilizing effect of maleic anhydride-modified polypropylene has been proposed. However, although the resin composition has improved bending strength, the impact strength has not been significantly improved. Further, JP-A-8-216122 discloses that
As a method of extruding a reinforced wood composite board that has high density, high strength and properties close to natural wood panels, wood powder and thermoplastic resin molding are mixed, gelled and kneaded, cooled, pulverized and sized. A method has been proposed in which a woody synthetic powder is mixed with a reinforcing material such as glass fiber, plastic fiber, carbon fiber, metal fiber, pulp fiber, or cotton fiber and extruded. However, even with this method, the fibers having a softening temperature lower than the softening temperature of the matrix resin or the fibers that do not soften are used, so that the impact strength of the obtained molded product is not significantly improved. Alternatively, there is a problem that molding is difficult or the surface of a molded article becomes rough. For this reason, there is a need for a thermoplastic resin composition that has good moldability, high impact strength, and can provide a molded article having an excellent woody feel.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a thermoplastic resin composition which contains wood flour, is easy to mold, has a high impact strength, and can give a molded article having an excellent woody feel. It was made for the purpose of providing.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, a resin composition containing a thermoplastic resin and wood flour has been further processed at a processing temperature of the thermoplastic resin. By blending a fiber having a softening temperature higher than that of 5 to 50 ° C., it has been found that the impact strength can be greatly improved while maintaining good moldability and excellent woody feel,
Based on this finding, the present invention has been completed. That is, the present invention relates to (1) (A) 100 parts by weight of a thermoplastic resin, and (B) wood powder 5-1 having an average particle size of 30 to 500 μm.
50 parts by weight, and (C) diameter 5 to 700 μm, length 2
A thermoplastic resin composition characterized by comprising 0.5 to 50 parts by weight of a fiber having a softening temperature of 5 to 50 ° C. higher than the processing temperature of the thermoplastic resin at 50 mm. . Further, as a preferred embodiment of the present invention,
(2) The thermoplastic resin is a polyolefin, and the fiber is
(1) The thermoplastic resin composition according to (1), which is a vinylon fiber or a polyester fiber, and (3) the thermoplastic resin composition, wherein the thermoplastic resin is a vinyl chloride resin, and the fiber is a vinylon fiber, a polyester fiber, or a nylon 6 fiber. The thermoplastic resin composition described in the item (1) can be used.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic resin composition of the present invention comprises:
(A) per 100 parts by weight of thermoplastic resin, (B) average particle size 3
5 to 150 parts by weight of wood powder of 0 to 500 μm and (C) a fiber having a diameter of 5 to 700 μm and a length of 2 to 50 mm and a softening temperature of 5 to 50 ° C. higher than the processing temperature of the thermoplastic resin.
5 to 50 parts by weight are blended. There is no particular limitation on the thermoplastic resin used in the composition of the present invention, for example, polyethylene, polypropylene, vinyl chloride resin, polyvinylidene chloride, polystyrene, saturated polyester resin,
ABS resin, nylon resin, polyacetal, acrylic resin, polycarbonate and the like can be mentioned. Among them, vinyl chloride resin, polyethylene and polypropylene can be particularly preferably used because they are excellent in the woodiness of the molded article. The wood flour used in the composition of the present invention is not particularly limited, and examples thereof include sawdust, crushed shavings, crushed thinned wood, and crushed waste wood. Among these, wood flour, which is obtained by accumulating sawdust produced as a by-product from a sawmill and partially fermenting the dried wood flour, has a high affinity for resin, and can be particularly preferably used. Sawdust, crushed shavings, crushed thinned wood and waste wood can be classified into wood flour having a predetermined average particle size. The average particle size of the wood flour used in the composition of the present invention is 30 to 500 µm, preferably 70 to 200 µm. Average particle size of wood flour is 30
If it is less than μm or more than 500 μm, it may be difficult to obtain a good woody feel. In the composition of the present invention, the blending amount of the wood flour is 5 to 150 parts by weight, preferably 30 to 100 parts by weight, per 100 parts by weight of the thermoplastic resin.
100 parts by weight. The amount of wood powder is thermoplastic resin 10
When the amount is less than 5 parts by weight per 0 parts by weight, uniform mixing is difficult, and it may be difficult to obtain a good woody feeling. If the amount of the wood powder exceeds 150 parts by weight per 100 parts by weight of the thermoplastic resin, the impact strength of the molded article may be reduced.

[0006] The diameter of the fiber used in the composition of the present invention is 5-7.
It is 00 μm, preferably 10 to 500 μm.
If the fiber diameter is less than 5 μm, the viscosity of the resin composition at the time of heating and melting increases, and molding may be difficult.
If the fiber diameter exceeds 700 μm, roughness may appear on the surface of the molded product, and the appearance may be poor. In general,
By compounding fibers, when a large force is applied instantaneously like an impact, the reinforcing effect of the fiber is large and easy to appear, whereas when the force is applied over time like bending, the compounding of the fiber The effect itself is very small. In addition, a fiber having a large diameter has a large effect of improving impact strength, and a fiber having a small diameter has an effect of slightly improving bending strength and flexural modulus. The diameter of the fiber to be blended can be selected. The length of the fibers used in the composition of the present invention is 2 to 50 mm, preferably 2 to 50 mm.
10 mm. If the length of the fiber is less than 2 mm, the reinforcing effect of the fiber becomes insufficient, and mechanical properties such as impact strength may not be sufficiently improved. Fiber length is 50
If it exceeds mm, the moldability may be poor. The fibers used in the composition of the present invention have a softening temperature 5 to 50C higher than the processing temperature of the thermoplastic resin, preferably 10 to 40C higher. Here, the processing temperature of the thermoplastic resin is not the set temperature of the roll or the cylinder of the molding machine,
This is the maximum temperature reached by the resin composition to be kneaded, and is often higher than the set temperature of a cylinder or the like.
The softening temperature of the fiber is the temperature at which heat shrinkage occurs by 10% when the fiber is heated at a rate of 10 ° C./min. Table 1 shows the softening temperatures of typical regenerated fibers, semi-synthetic fibers and synthetic fibers. When a vinyl chloride resin or a polyolefin is used as a thermoplastic resin as a matrix, the fibers are preferably vinylon fibers, polyester fibers or nylon 6 fibers, and particularly preferably vinylon fibers.

[0007]

[Table 1]

[0008] If the difference between the processing temperature of the thermoplastic resin and the softening temperature of the fiber is less than 5 ° C, the fiber may be cut during the molding of the resin, and a sufficient reinforcing effect may not be obtained. When the softening temperature of the fiber is higher than the processing temperature of the thermoplastic resin by more than 50 ° C., the affinity between the thermoplastic resin and the fiber is insufficient, and a sufficient reinforcing effect may not be obtained.
Roughness may appear on the surface skin of the molded article. If the amount of the fiber is less than 0.5 part by weight per 100 parts by weight of the thermoplastic resin, a sufficient reinforcing effect may not be obtained. The fiber content is 5 per 100 parts by weight of the thermoplastic resin.
If it exceeds 0 parts by weight, moldability may be reduced.
The method for producing the thermoplastic resin composition of the present invention is not particularly limited. For example, after kneading a thermoplastic resin and wood flour using a roll or the like, adding a fiber, mixing and forming a sheet, and the obtained sheet is obtained. By pressing, a molded product can be obtained. Alternatively, a thermoplastic resin and wood flour are mixed using a Henschel mixer or the like, and then pelletized using an extruder. Further, fibers are added to the obtained pellets and molded using an extruder to form an extruded product. It can also be. In this case, the fibers may be added at the time of mixing with a Henschel mixer or the like before pellet formation. In the thermoplastic resin composition of the present invention, if necessary, an antioxidant, an ultraviolet absorber, a plasticizer, a lubricant, a coloring agent, an antistatic agent, a filler, a flame retardant, a foaming agent, and the like may be blended. it can.

[0009]

The present invention will be described in more detail with reference to the following examples.
The present invention is not limited to these examples.
It is not specified. Example 1 70-weight polypropylene [Showa Denko KK-SK-711]
Parts, polyethylene [Showa Denko KK, SS-60] 30
Parts by weight, wood flour [Shimada Shokai Co., Ltd., Cell Junt, average particle size
70 μm, moisture 5% by weight] 60 parts by weight and stearic acid
2 parts by weight of barium was kneaded with a roll at 185 ° C.
Furthermore, vinylon fiber [Unitika Ltd., vinylon A]
B, 1,800D (14 μm diameter fiber
Fiber that is gently bundled with a bundling agent to a diameter of about 450 μm)
10 mm length, 225 ° C softening temperature] 5 parts by weight
It was kneaded and taken out as a sheet having a thickness of 1.2 mm. This
Cut the sheet into 10cm x 15cm, stack 4 sheets and apply pressure 1
11kg / cm^TwoG, press molding at 180 ° C for 10 minutes
Then, a plate having a thickness of 4 mm was obtained. Cut the test piece from the obtained plate
Out, Charpy impact according to JIS K 7111
Test, bending test according to JIS K 7203
Was. Charpy impact value is 6.3kgf ・ cm / cm^Two, Bending strength
488kgf / cm^TwoThe flexural modulus is 33,830 kgf / cm^Twoso
there were. Example 2 Example 2 was repeated except that the blending amount of vinylon fiber was changed to 10 parts by weight.
The same operation as in Example 1 was repeated. Charpy of the obtained plate
Impact value is 12.7kgf ・ cm / cm^TwoAnd the bending strength is 563.
kgf / cm^TwoAnd the flexural modulus is 39,920 kgf / cm^Twoso
there were. Example 3 Example 3 was repeated except that the blending amount of vinylon fiber was changed to 20 parts by weight.
The same operation as in Example 1 was repeated. Charpy of the obtained plate
Impact value is 15.9kgf ・ cm / cm^TwoAnd the bending strength is 500
kgf / cm^TwoAnd the flexural modulus is 30,130 kgf / cm^Twoso
there were. Example 4 Example 4 was repeated except that the blending amount of vinylon fiber was changed to 30 parts by weight.
The same operation as in Example 1 was repeated. Charpy of the obtained plate
Impact value is 19.2kgf · cm / cm^TwoAnd the bending strength is 527.
kgf / cm^TwoAnd the flexural modulus is 27,250 kgf / cm^Twoso
there were. Comparative Example 1 Except that the blending amount of vinylon fiber was 2.5 parts by weight,
The same operation as in Example 1 was repeated. Charpy of the obtained plate
-Impact value is 5.3kgfcm / cm^TwoAnd the bending strength is 455
kgf / cm^TwoAnd the flexural modulus is 28,380 kgf / cm^Twoso
there were. Example 5 The fiber to be blended was vinylon fiber [Unitika Ltd., vinylon
MF, 500D (single fiber with a diameter of about 270 μm), fiber length 1
0 mm and a softening temperature of 225 ° C.].
Operation was repeated. The Charpy impact value of the obtained plate is
7.6kgf ・ cm / cm^TwoAnd the bending strength is 523 kgf / cm^Twoso
Yes, flexural modulus is 28,410kgf / cm ^TwoMet. Example 6 Example 6 was repeated except that the blending amount of vinylon fiber was changed to 10 parts by weight.
The same operation as in Example 5 was repeated. Charpy of the obtained plate
Impact value is 10.4kgf ・ cm / cm^TwoAnd the bending strength is 464
kgf / cm^TwoAnd the flexural modulus is 30,570 kgf / cm^Twoso
there were. Example 7 Example 7 was repeated except that the blending amount of vinylon fiber was changed to 20 parts by weight.
The same operation as in Example 5 was repeated. Charpy of the obtained plate
Impact value is 25.0kgf · cm / cm^TwoAnd the bending strength is 462.
kgf / cm^TwoAnd the flexural modulus is 29,350 kgf / cm^Twoso
there were. Example 8 Example 8 was repeated except that the blending amount of vinylon fiber was changed to 30 parts by weight.
The same operation as in Example 5 was repeated. Charpy of the obtained plate
Impact value is 19.2kgf · cm / cm^TwoAnd the bending strength is 477.
kgf / cm^TwoAnd the flexural modulus is 29,980 kgf / cm^Twoso
there were. Comparative Example 2 Except that the blending amount of vinylon fiber was 2.5 parts by weight,
The same operation as in Example 5 was repeated. Charpy of the obtained plate
-Impact value is 5.7kgf ・ cm / cm^TwoAnd the bending strength is 534.
kgf / cm^TwoAnd the flexural modulus is 29,420 kgf / cm^Twoso
there were. Example 9 The fiber to be blended was a polyester fiber [Toray Industries, Inc., Tetro
2D, fiber length 3mm, softening temperature 240 ° C]
The same operation as in Example 1 except that the blending amount was changed to 10 parts by weight.
Was repeated. The Charpy impact value of the obtained plate is 6.8k
gf · cm / cm^TwoAnd the bending strength is 972 kgf / cm^TwoAnd
Flexural modulus is 50,960 kgf / cm^TwoMet. Comparative Example 3 Kanecaron fiber [Kanekachi Chemical Co., Ltd.
Rotex, 3D, fiber length 3mm, softening temperature 155 ℃]
Example 1 was repeated except that the amount was 10 parts by weight.
The same operation was repeated. Charpy impact value of the obtained plate
Is 3.4 kgf · cm / cm^TwoAnd the bending strength is 1,162 kgf /
cm^TwoAnd the flexural modulus is 51,100 kgf / cm^TwoSo
Was. Comparative Example 4 A fiber to be blended was nylon 6 fiber [Toray Industries, Inc., Amiran,
2D, fiber length 3mm, softening temperature 180 ℃]
The same operation as in Example 1 was repeated except that the amount was 10 parts by weight.
I returned. The Charpy impact value of the obtained plate is 5.6 kgf ・ c
m / cm^TwoAnd the bending strength is 1,204 kgf / cm^TwoAnd
Flexural modulus is 46,730kgf / cm^TwoMet. Comparative Example 5 Rayon fiber [Daiwa Spinning Co., Ltd., Corona,
3D, fiber length 3 mm, does not soften].
The same operation as in Example 1 was repeated except that the weight was 0 parts by weight.
Was. The Charpy impact value of the obtained plate is 3.7 kgf · cm / cm.^Two
And the bending strength is 1,057 kgf / cm^TwoIs a bending bullet
47,860kgf / cm^TwoMet. Comparative Example 6 Carbon fiber [Dainippon Ink Chemical Industry Co., Ltd.
Donac, S-234, diameter 13μm, fiber length 25mm, soft
And the compounding amount was 10 parts by weight.
The same operation as in Example 1 was repeated. The resulting plate
The rupee impact value is 3.9kgf · cm / cm^TwoAnd the bending strength is
877kgf / cm^TwoAnd the flexural modulus is 41,190 kgf /
cm^TwoMet. Comparative Example 7 Carbon fiber [Dainippon Ink Chemical Industry Co., Ltd.
Donac, S-276, diameter 13μm, fiber length 25mm, soft
And the compounding amount was 10 parts by weight.
The same operation as in Example 1 was repeated. The resulting plate
The rupee impact value is 3.7 kgf · cm / cm^TwoAnd the bending strength is
820kgf / cm^TwoAnd the flexural modulus is 40,160 kgf /
cm^TwoMet. Comparative Example 8 The same operation as in Example 1 was repeated except that the fiber was not blended.
did. The Charpy impact value of the obtained plate is 4.1 kgf · cm / c.
m^TwoAnd the bending strength is 458 kgf / cm^TwoAnd bending elasticity
The rate is 33,070kgf / cm^TwoMet. Examples 1 to 9 and
Table 2 shows the results of Comparative Examples 1 to 8.

[0010]

[Table 2]

As can be seen from Table 2, vinylon fibers having a softening temperature of 225 ° C. or polyester fibers having a softening temperature of 240 ° C. are mixed with a mixed resin of polypropylene and polyethylene.
Molded articles obtained from the resin compositions of Examples 1 to 9 mixed with 5 to 30 parts by weight per 100 parts by weight of resin have a large Charpy impact value and are excellent in impact resistance. On the other hand, even if the same vinylon fiber is blended, the resin composition of Comparative Example 1 and Comparative Example 2 having a small blending amount has a softening temperature of 15%.
Kanekalon fiber of 5 ° C, nylon 6 with softening temperature of 180 ° C
Resin compositions of Comparative Examples 3 and 4 in which fibers are blended, resin compositions of Comparative Example 5 in which non-softening rayon fibers are blended,
The molded products obtained from the resin compositions of Comparative Examples 6 and 7 in which the non-softening carbon fiber was blended had low Charpy impact values, similarly to the molded products obtained from the resin composition of Comparative Example 8 in which the fibers were not blended. No improvement in impact resistance is observed. Example 10 Vinyl chloride resin [Shin Daiichi PVC Co., Ltd., ZEST700L,
Average polymerization degree 680] 100 parts by weight, wood flour [Shimada Shokai Co., Ltd., Cell Junt, average particle size 70 μm, moisture 5% by weight] 4
5 parts by weight, 2 parts by weight of a tin-based heat stabilizer, 2.5 parts by weight of a lubricant and 1 part by weight of a processing aid are kneaded with a roll at 170 ° C., and then a vinylon fiber [Unitika Corporation, Vinylon A;
B, 1,800 D (fibers having a diameter of about 450 μm obtained by twisting fibers having a diameter of 14 μm and gently bundling them with a sizing agent), fiber length of 10 mm, softening temperature of 225 ° C.], 10 parts by weight, and kneading. The sheet was taken out as a 1.2 mm sheet. This sheet was cut into a size of 10 cm × 15 cm, and four sheets were laminated and press-molded at a pressure of 111 kg / cm ² G and a temperature of 170 ° C. for 10 minutes to obtain a plate having a thickness of 4 mm. A test piece was cut out from the obtained plate and subjected to a Charpy impact test according to JIS K 7111 and a bending test according to JIS K 7203. The Charpy impact value was 6.7 kgf · cm / cm ² , the bending strength was 982 kgf / cm ² , and the flexural modulus was 49,660 kgf / cm ² . Example 11 The fibers to be blended were vinylon fibers [Unitika KK, Vinylon MF, 500D (single fiber having a diameter of about 270 μm), fiber length 1]
0 mm and a softening temperature of 225 ° C.], and the same operation as in Example 10 was repeated. The Charpy impact value of the obtained plate was 19.6 kgf · cm / cm ² and the bending strength was 950 kgf / c.
m ^2, and a flexural modulus of 57,860kgf / cm ^2. Example 12 The same operation as in Example 10 was repeated, except that the fiber to be blended was a polyester fiber [Teijin Co., Tepils, 0.5D, fiber length 5 mm, softening temperature 240 ° C]. The obtained plate had a Charpy impact value of 3.3 kgf · cm / cm ² , a bending strength of 861 kgf / cm ² and a flexural modulus of 43,34.
It was 0 kgf / cm ² . Example 13 The same operation as in Example 10 was repeated except that the fiber to be blended was a polyester fiber [Toray Industries, Inc., Tetron, 2D, fiber length 3 mm, softening temperature 240 ° C]. The Charpy impact value of the obtained plate was 4.0 kgf · cm / cm ² , the bending strength was 877 kgf / cm ² , and the flexural modulus was 41,190 kgf.
/ Cm ² . Example 14 The fiber to be blended was nylon 6 fiber [Toray Industries, Inc., Amiran,
2D, fiber length 3 mm, softening temperature 180 ° C]
The same operation as in Example 10 was repeated. The Charpy impact value of the obtained plate was 3.9 kgf · cm / cm ² , and the bending strength was 8
20 kgf / cm ² and flexural modulus of 40,160 kgf / cm
^{Was 2} . Comparative Example 9 The same operation as in Example 10 was repeated, except that the fiber to be blended was Kanekalon fiber [Kanebuchi Chemical Industry Co., Ltd., Protex, 3D, fiber length 3 mm, softening temperature 155 ° C]. The Charpy impact value of the obtained plate was 2.2 kgf · cm / cm ² ,
The flexural strength is 1,007 kgf / cm ² and the flexural modulus is 4
It was 7,380 kgf / cm ² . Comparative Example 10 Rayon fiber [Daiwa Spinning Co., Ltd., Corona,
3D, fiber length 3 mm, not softened], the same operation as in Example 10 was repeated. The Charpy impact value of the obtained plate was 2.2 kgf · cm / cm ² , and the bending strength was 1,000.
4 kgf / cm ² and a flexural modulus of 41,740 kgf / cm ²
Met. Comparative Example 11 The same operation as in Example 10 was repeated, except that the fiber to be blended was aramid fiber [Toray Dupont Co., Ltd., Kevlar (para series), about 1D, fiber length 3 mm, not softened]. The Charpy impact value of the obtained plate was 2.5 kgf · cm / cm ² ,
The flexural strength is 1,204 kgf / cm ² and the flexural modulus is 4
It was 6,730 kgf / cm ² . Comparative Example 12 The fiber to be blended was rock wool [Shin Nikka Rock Wool
Co., Ltd., average diameter: about 4.5 μm, average fiber length: 300 μm, does not soften]. The Charpy impact value of the obtained plate is 2.1 kgf · cm.
/ Cm ² , the flexural strength was 972 kgf / cm ² , and the flexural modulus was 50,960 kgf / cm ² . Comparative Example 13 Aluminum borate whisker [Shikoku Chemicals]
Co., Ltd., Arbolex, diameter 0.5-1 μm, length 10
30 μm], and the same operation as in Example 10 was repeated. The Charpy impact value of the obtained plate is 2.3 kgf · cm
/ Cm ² , the flexural strength was 1,057 kgf / cm ² , and the flexural modulus was 47,860 kgf / cm ² . Comparative Example 14 The same operation as in Example 10 was repeated except that the fiber was not blended. The Charpy impact value of the obtained plate is 2.6 kgf · cm
/ Cm ² , the flexural strength was 1,040 kgf / cm ² , and the flexural modulus was 50,770 kgf / cm ² . Example 10
Table 3 shows the results of Nos. To 14 and Comparative Examples 9 to 14.

[0012]

[Table 3]

As shown in Table 3, vinylon fibers having a softening temperature of 225 ° C. and a softening temperature of 240
Molded products obtained from the resin compositions of Examples 10 to 14 in which polyester fibers of 10 ° C. or nylon 6 fibers of a softening temperature of 180 ° C. were blended at 10 parts by weight per 100 parts by weight of the resin,
High Charpy impact value and excellent impact resistance. On the other hand, the resin composition of Comparative Example 8 containing Kanekalon fiber having a softening temperature of 155 ° C., the resin composition of Comparative Example 9 containing rayon fiber that does not soften, and the resin composition of Comparative Example 10 containing aramid fiber that does not soften were used. Comparative Example 1 in which a resin composition and a non-softening rock wool were blended and Comparative Example 11 in which a non-softening aluminum borate whisker was blended
The molded article obtained from the resin composition of No. 2 has a low Charpy impact value similarly to the molded article obtained from the resin composition of Comparative Example 13 containing no fiber, and no improvement in impact resistance is observed. Further, when the effect of the thickness of the vinylon fibers in Example 10 and Example 11 is viewed, there is a remarkable difference in the impact strength. This is because in the processing of vinyl chloride resin,
The apparently thick vinylon AB is loosened, and the structural unit 14
This is considered to be due to the fact that the fibers become μm fibers and are dispersed in the matrix resin. In the processing of polyolefin, vinylon AB has almost the same effect as vinylon MF (Example 1).
In (8), the low polarity of the polyolefin may make it difficult to loosen the fiber. Example 15 Polypropylene [Showa Denko KK, SK-711] 70 parts by weight, polyethylene [Showa Denko KK, SS-60] 30
Parts by weight, wood flour [Shimada Shokai Co., Ltd., CELLJUNT, average particle size 70 μm, moisture 5% by weight] 60 parts by weight and barium stearate 2 parts by weight are charged into a Henschel mixer, and heated while mixing to evaporate water. I let it. The temperature of the mixture is 1
When the temperature reached 40 ° C., the mixture was transferred to a cooling mixer, and vinylon fiber [Unitika Ltd., Vinylon AB,
1,800D, fiber length 10mm] and 10 parts by weight were mixed and the temperature was lowered to 80 ° C while mixing. The resulting powdery mixture was pelletized by using a vented conical twin-screw extruder having a cylinder diameter of 80 mm while evaporating the water remaining from the vent portion. The screw has a rotation speed of 40 rpm, the set temperature is C ₁ 160 ° C.,
C ₂ 170 ° C, C ₃ 190 ° C, Head 190 ° C, Die 1
95 ° C. The die has 3 mmφ × 20 holes. The obtained pellets were extruded into a plate having a thickness of 20 mm and a width of 600 mm using a single screw extruder having a cylinder diameter of 80 mm. Screw, L / D = 28, compression ratio 2.5, a rotational speed 30 rpm, temperature _{setting, C 1 160 ℃, C 2} 1
70 ° C., C ₃ 190 ° C., C ₄ 190 ° C., head 190 ° C.,
D 200 ° C. Cut out the test piece from the obtained plate,
Charpy impact test according to JIS K 7111,
A bending test was performed according to JIS K7203. Charpy impact value is 9.5 kgf · cm / cm ² , bending strength is 340
kgf / cm ^2, a flexural modulus of 29,500kgf / cm ^2. Example 16 The same operation as in Example 15 was repeated except that the blending amount of vinylon fiber was changed to 20 parts by weight. The Charpy impact value of the obtained plate was 13.5 kgf · cm / cm ² , and the bending strength was 67.
0 kgf / cm ² and a flexural modulus of 32,500 kgf / cm ²
Met. Example 17 The same operation as in Example 15 was repeated, except that the fiber to be blended was a polyester fiber [Toray Industries, Inc., Tetron, 2D, fiber length 3 mm, softening temperature 240 ° C]. The Charpy impact value of the obtained plate was 6.2 kgf · cm / cm ² , the bending strength was 450 kgf / cm ² , and the flexural modulus was 43,500 kgf.
/ Cm ² . Comparative Example 15 The same operation as in Example 15 was repeated, except that the fiber to be blended was Kanekalon fiber [Kanebuchi Chemical Industry Co., Ltd., Protex, 3D, fiber length 3 mm, softening temperature 155 ° C]. The Charpy impact value of the obtained plate was 3.2 kgf · cm / cm ² ,
The flexural strength is 648 kgf / cm ² and the flexural modulus is 45,
It was 700 kgf / cm ² . Comparative Example 16 The fiber to be blended was rayon fiber [Daiwa Spinning Co., Ltd., Corona,
3D, fiber length 3 mm, not softened], the same operation as in Example 15 was repeated. The Charpy impact value of the obtained plate was 3.6 kgf · cm / cm ² and the bending strength was 703 kg.
f / cm ² , and the flexural modulus was 42,300 kgf / cm ² . Comparative Example 17 The same operation as in Example 15 was repeated except that the fiber was not blended. The Charpy impact value of the obtained plate is 5.1 kgf · cm.
/ Cm ² , the flexural strength was 262 kgf / cm ² , and the flexural modulus was 25,900 kgf / cm ² . Example 15-
Table 4 shows the results of Comparative Example 17 and Comparative Examples 15 to 17.

[0014]

[Table 4]

As can be seen from Table 4, vinylon fibers having a softening temperature of 225 ° C. or polyester fibers having a softening temperature of 240 ° C. were mixed with a mixed resin of polypropylene and polyethylene.
Molded articles obtained from the resin compositions of Examples 15 to 17 in which 10 to 20 parts by weight were blended per 100 parts by weight of the resin had a large Charpy impact value and excellent impact resistance. On the other hand, the molded products obtained from the resin composition of Comparative Example 15 containing the Kanekalon fiber having a softening temperature of 155 ° C. and the resin composition of Comparative Example 16 containing the rayon fiber which does not soften were compared with those without the fiber. The Charpy impact value was lower than that of the molded product obtained from the resin composition of Example 17, and no improvement in impact resistance was observed. Example 18 Vinyl chloride resin [Shin Daiichi PVC Co., Ltd., ZEST700L,
Average polymerization degree 680] 100 parts by weight, wood flour [Shimada Shokai Co., Ltd., Cell Junt, average particle size 70 μm, moisture 5% by weight] 4
5 parts by weight, 2 parts by weight of a tin-based heat stabilizer, 2.5 parts by weight of a lubricant and 1 part by weight of a processing aid were charged into a Henschel mixer and heated while mixing to evaporate water. When the temperature of the mixture reached 130 ° C, the mixture was transferred to a cooling mixer and the temperature was reduced to 50 ° C while mixing. The resulting powdery mixture was pelletized using a vented extruder with a cylinder diameter of 65 mm while evaporating the water remaining from the vent. Screw, L / D = 24, compression ratio 2.5, a rotational speed 30 rpm, temperature setting, C ₁ 1
40 ° C., C ₂ 140 ° C., C ₃ 150 ° C., C ₄ 160 ° C., head 170 ° C., and die 170 ° C. The dies are 3 mmφ pellets × 12 holes and land length is 10 mm. 100.5 parts by weight of vinylon fiber [Unitika Ltd., Vinylon AB, 1,800 D, fiber length 10 mm] was blended with 150.5 parts by weight of the obtained pellets, and the cylinder diameter was 80 mm.
A plate having a thickness of 20 mm and a width of 600 mm was extruded using a single screw extruder. The screw had an L / D of 28, a compression ratio of 2.5, a rotation speed of 30 rpm, and a set temperature of C ₁ 160
_{℃, C 2 170 ℃, C} 3 175 ℃, C 4 180 ℃, head 180 ° C., a D180 ° C.. A test piece was cut out from the obtained plate and subjected to a Charpy impact test according to JIS K 7111 and a bending test according to JIS K 7203. The Charpy impact value is 4.9 kgf · cm / cm ² , the bending strength is 690 kgf / cm ² , and the flexural modulus is 39,500 kgf / cm
^{Was 2} . Example 19 The same operation as in Example 18 was repeated, except that the fiber to be blended was vinylon fiber [Unitika Ltd., Vinylon MF, 500D, fiber length 10 mm, softening temperature 225 ° C]. The Charpy impact value of the obtained plate was 11.5 kgf · cm / cm ² , the bending strength was 672 kgf / cm ² , and the flexural modulus was 3
It was 7,900 kgf / cm ² . Example 20 The same operation as in Example 18 was repeated, except that the fiber to be blended was a polyester fiber [Toray Industries, Tetron, 2D, fiber length 3 mm, softening temperature 240 ° C]. The Charpy impact value of the obtained plate was 3.1 kgf · cm / cm ² , the bending strength was 547 kgf / cm ² , and the flexural modulus was 32,400 kgf.
/ Cm ² . Comparative Example 18 The same operation as in Example 18 was repeated except that the fiber to be blended was Kanekalon fiber [Kanebuchi Chemical Industry Co., Ltd., Protex, 3D, fiber length 3 mm, softening temperature 155 ° C]. The Charpy impact value of the obtained plate was 2.4 kgf · cm / cm ² ,
The flexural strength is 633 kgf / cm ² and the flexural modulus is 33,
It was 600 kgf / cm ² . Comparative Example 19 A fiber to be blended was rayon fiber [Daiwa Spinning Co., Ltd., Corona,
3D, fiber length 3 mm, not softened], and the same operation as in Example 18 was repeated. The Charpy impact value of the obtained plate was 2.2 kgf · cm / cm ² and the bending strength was 606 kg.
f / cm ² , and the flexural modulus was 30,500 kgf / cm ² . Comparative Example 20 The same operation as in Example 18 was repeated except that the fiber was not blended. The Charpy impact value of the obtained plate is 2.5 kgf · cm
/ Cm ² , the flexural strength was 650 kgf / cm ² , and the flexural modulus was 38,300 kgf / cm ² . Example 18-
Table 5 shows the results of Comparative Example 20 and Comparative Examples 18 to 20.

[0016]

[Table 5]

As shown in Table 5, vinyl chloride fibers having a softening temperature of 225.degree.
A polyester fiber at 0 ° C. is added in an amount of 1
Molded articles obtained from the resin compositions of Examples 18 to 20 containing 0 parts by weight have a large Charpy impact value and are excellent in impact resistance. On the other hand, the molded products obtained from the resin composition of Comparative Example 18 containing the Kanekalon fiber having a softening temperature of 155 ° C. and the resin composition of Comparative Example 19 containing the rayon fiber which does not soften were compared with those without the fiber. Similar to the molded product obtained from the resin composition of Example 20, the Charpy impact value is low, and no improvement in impact resistance is observed.

[0018]

Industrial Applicability The thermoplastic resin composition of the present invention can be easily molded, contains wood flour, and gives a molded article having an excellent woody feel, and has a high impact strength. It is large and has excellent impact resistance.

Claims (1)

[Claims] (A) per 100 parts by weight of a thermoplastic resin,
(B) 5 to 150 parts by weight of wood powder having an average particle size of 30 to 500 μm, and (C) 5 to 700 μm in diameter and 2 to 50 mm in length
A thermoplastic resin composition characterized by comprising 0.5 to 50 parts by weight of a fiber having a softening temperature of 5 to 50 ° C. higher than the processing temperature of the thermoplastic resin.