JP2000044809A - Resin composition containing wood powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition capable of providing a composite material excellent in water-proof, dimension stability, and obtained by compounding a wood power and a thermoplastic resin by including the wood powder with a specific particle diameter, and a thermoplastic synthetic resin. SOLUTION: The objective composition comprises (A) a wood powder comprising >=95% particles with <=300 μm particle diameters, (B) a thermoplastic synthetic resin, optionally (C) an inorganic material, (D) a coupling agent, (E) a thermoplastic synthetic resin modified with an acid anhydride and (F) a compound o the like having OH group or CHO group. The component A is preferably the one treated with the acid anhydride (e.g. maleic anhydride). The component C is preferably talc, calcium carbonate, Shirasu (volcanic ash) balloons, perlite, aluminum hydroxide, mica or the like. Glycerol, ethylene glycol or the like is cited as the compound having the OH group in the component F, and glyoxal or the like is cited as the compound having the CHO group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a resin composition containing wood flour.

[0002]

2. Description of the Related Art Conventionally, a resin composition containing wood flour, which is a molding material obtained by compounding wood flour and a thermoplastic synthetic resin such as vinyl chloride, polyethylene or polypropylene, has been known.

[0003] A molded article molded from the resin composition containing wood flour has excellent water resistance and durability as compared with a wood material.
Since the moisture absorption and water absorption of the wood flour itself are still maintained, the dimensional change is large when exposed to moisture or water for a long period of time, causing problems such as discoloration and swelling. In particular, conventionally, in a wood flour-containing resin composition composed of wood flour and a thermoplastic synthetic resin, at least 20% of all wood flour has a particle size of 400 μm or more. There is a problem that kneading with the thermoplastic synthetic resin is difficult to be uniform, bonding (compositing) between the thermoplastic synthetic resin and the wood powder is hard to occur, and water resistance and dimensional stability are reduced.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and is intended to form a composite material made of a composite of a wood powder and a thermoplastic synthetic resin having excellent water resistance and dimensional stability. It is an object of the present invention to provide a wood flour-containing resin composition that can be used.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, a resin composition containing wood flour according to the present invention is a resin composition comprising wood flour and a thermoplastic synthetic resin, wherein the particle of wood flour is used. The diameter is 95% or more and 300 μm or less. Thus, in all wood flour, the particle size is 30
Since the wood powder as small as 0 μm or less is 95% or more, uniform kneading with the thermoplastic synthetic resin, bonding (compositing) with the thermoplastic synthetic resin easily occurs, and water resistance and dimensional stability are improved. It is.

Further, it is preferable that an inorganic substance is added to a resin composition containing wood powder comprising wood powder and a thermoplastic synthetic resin. By adding an inorganic substance as described above, water resistance, dimensional stability, and heat resistance are improved. It is preferable that at least one of talc, calcium carbonate, shirasu balloon, pearlite, aluminum hydroxide, and mica is added to the inorganic substance.
Preferably, it is blended in an amount of up to 50 parts by weight. In particular, talc has a cleaving property, is easy to knead with wood powder and a thermoplastic synthetic resin, is easy to homogenize, and has a low thermal conductivity. Therefore, it is preferable to use a talc.

Further, it is preferable to add a coupling agent to a resin composition composed of wood flour and a thermoplastic synthetic resin. As described above, by adding the coupling agent, the compatibility between the wood flour and the thermoplastic synthetic resin or the wood flour, the thermoplastic synthetic resin, and the inorganic substance is improved, and the water resistance and the dimensional stability are improved. is there.

It is preferable that the wood flour is treated with an acid anhydride. With such a configuration, the compatibility between the wood powder and the thermoplastic synthetic resin is improved, and the water resistance and dimensional stability are improved. And it is preferable that the acid anhydride is maleic anhydride.

Further, it is preferable to add a thermoplastic synthetic resin modified with an acid anhydride to a resin composition containing wood flour and a thermoplastic synthetic resin. With such a configuration, the compatibility of the wood powder with the thermoplastic synthetic resin is improved, and the water resistance and dimensional stability are improved. Then, it is preferable to add a thermoplastic synthetic resin modified with maleic anhydride.

It is preferable to add a compound having an OH group or a CHO group. With such a configuration, it is possible to cause cross-linking of the wood flour itself or the wood flour and the thermoplastic synthetic resin. And O
Preferably, the compound having an H group is glycerin, ethylene glycol, or pentaerythol, and the compound having a CHO group is glyoxal or glutaraldehyde.

Further, it is preferable that only a mixture of wood flour and a thermoplastic synthetic resin or wood flour is heat-treated at 200 to 300 ° C. As described above, the water treatment and the dimensional stability of the wood powder can be improved by the heat treatment.

It is preferable that the heat treatment is performed under reduced pressure or heat treatment under an atmosphere containing 95% or more of nitrogen. Although the water resistance and dimensional stability of the wood flour are improved, the oxidation of the wood flour is prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described.

In the present invention, a resin composition containing wood flour and a thermoplastic synthetic resin is characterized in that, in the present invention, 95% or more of all wood flour has a particle size of 300 μm or less. . Thus, in all wood flour, the particle size is 300μ.
m or less is 95% or more, and therefore, in producing a resin composition containing wood flour comprising a wood flour and a thermoplastic synthetic resin, when the wood flour and the thermoplastic synthetic resin are kneaded. It is possible to obtain a resin composition containing wood powder that can be uniformly kneaded, easily bond (composite) the wood powder with the thermoplastic synthetic resin, and have improved water resistance and dimensional stability. Note that wood powder having a particle size of 10 μm or more is used, but the lower limit of the particle size of the wood powder is not particularly limited.

The wood flour to be blended is not particularly limited except for the particle size as described above. Further, as the thermoplastic synthetic resin to be blended, an olefin-based thermoplastic synthetic resin such as polypropylene and polyethylene is used. In addition, in addition to the above-mentioned wood flour and thermoplastic synthetic resin, a thermoplastic synthetic resin modified with an acid anhydride is added to the resin composition containing wood flour of the present invention. Further, if necessary, an inorganic substance may be added.

As the thermoplastic synthetic resin modified with an acid anhydride, a polyolefin resin modified with maleic anhydride is used. By adding the thermoplastic synthetic resin modified with the acid anhydride, wood powder is obtained. And the thermoplastic synthetic resin have increased compatibility, thereby improving water resistance and dimensional stability. The mixing ratio of the wood flour and the total resin is determined in consideration of moldability, wood texture, water resistance, dimensional stability, and the like.
A ratio of up to 6: 4 (this ratio depends on parts by weight) is preferred. The thermoplastic synthetic resin modified with an acid anhydride is 1 to 20% by weight of the unmodified thermoplastic synthetic resin.

As the inorganic substance to be added, talc, charcoal,
Aluminum hydroxide, mica, perlite, shirasu balloon and the like can be used, and the addition of these inorganic substances improves the water resistance and dimensional stability of the resin composition containing wood powder. In particular, when talc is added, the takuru has a cleaving property, is easily kneaded with wood powder and a thermoplastic synthetic resin, and is more easily homogenized. Also,
Since talc also has a low thermal conductivity, it is preferable to use talc. The addition amount of the inorganic substance is 1 part by weight to 50 parts by weight.

A coupling agent such as a silane coupling agent may be added to a resin composition containing wood powder and a thermoplastic synthetic resin. By adding the coupling agent, the compatibility between the wood powder and the thermoplastic synthetic resin, or between the wood powder, the thermoplastic synthetic resin, and the inorganic substance is improved, and the water resistance and dimensional stability can be improved.

The wood flour-containing resin composition comprising the wood flour and the thermoplastic synthetic resin according to the present invention uses 95% or more of the whole wood flour having a particle size of 300 μm or less. In addition to the synthetic resin, a thermoplastic synthetic resin denatured with an inorganic substance or an acid anhydride is added and kneaded. Then, a composite of wood flour and a synthetic resin is molded using the resin composition containing wood flour. In molding, for example, molding is performed by an extruder. The composite of the wood flour and the synthetic resin thus formed is laminated on a base material, for example, and can be used as a building material or a member of furniture.

Next, a second embodiment of the present invention will be described. In the present embodiment, wood flour (95% of all wood flour)
The basic structure of adding a thermoplastic synthetic resin modified with an acid anhydride to a thermoplastic synthetic resin (and further adding an inorganic material as necessary) is added to the thermoplastic synthetic resin. This embodiment is similar to the first embodiment described above, but is characterized in that the present embodiment uses wood powder treated with an acid anhydride. That is, by treating wood flour with an acid anhydride, the compatibility with the thermoplastic synthetic resin is further improved, and the material can be made uniform and composite, and the physical properties are also improved. Acetic anhydride and maleic anhydride are used as acid anhydrides for treating wood flour, and maleic anhydride is particularly preferred. Wood powder 1
0.1 parts by weight to 5 parts by weight with respect to 00 parts by weight is preferred. A catalyst such as sodium acetate may be added to promote the reaction between the acid anhydride and the wood flour. As a method of treating wood flour with an acid anhydride, for example,
Wood flour, maleic anhydride, and a catalyst are mixed and stirred, and the heat generated by shearing the wood flour raises the temperature of the wood flour itself to promote the reaction.
Moreover, you may heat and stir at 100-200 degreeC. Further, in order to cause crosslinking of the wood flour itself or the wood flour and the thermoplastic synthetic resin, the performance is further improved by adding a compound having an OH group or a CHO group together with maleic anhydride. Examples of the compound having an OH group include glycerin, ethylene glycol, and pentaerythritol, and examples of the compound having a CHO group include glyoxal and glutaraldehyde. The addition ratio is preferably 0.1 to 1.0 mol per 1 mol of maleic anhydride.

As the molding method, after the wood powder is treated with an acid anhydride, the wood powder treated with the acid anhydride, a thermoplastic synthetic resin, and a thermoplastic synthetic resin denatured with the acid anhydride (further, And an inorganic substance may be added to the mixture). Wood flour, an acid anhydride, a thermoplastic synthetic resin, and a thermoplastic synthetic resin modified with an acid anhydride (an inorganic substance may be further added thereto) may be simultaneously kneaded.

Next, a third embodiment of the present invention will be described. In the present embodiment, wood flour (95% of all wood flour)
In addition to the thermoplastic synthetic resin, a thermoplastic synthetic resin denatured with an acid anhydride is further added, and an inorganic substance may be added as necessary. The basic structure of the method is the same as that of the first embodiment. However, in the present embodiment, the mixture of the wood flour and the thermoplastic synthetic resin or only the wood flour is 200 to 200.
It is characterized by being heat-treated at 300 ° C. That is, a composite of wood flour and a synthetic resin molded using a wood flour-containing resin composition composed of wood flour and a thermoplastic synthetic resin is a material excellent in water resistance and durability as compared with a wood material. However, since the wood powder itself retains its hygroscopicity and water absorbency, dimensional changes are large when exposed to moisture or water for a long period of time, causing problems such as discoloration, swelling, and decay. In addition, a mixture of wood flour and a thermoplastic synthetic resin or only wood flour is subjected to heat treatment at 200 to 300 ° C. to improve water resistance and dimensional stability.
Here, when the wood powder is subjected to a high-temperature heat treatment, the wood powder is deteriorated by oxidation due to a high temperature. For this reason, for example, a mixture of wood flour and a thermoplastic synthetic resin or only the wood flour is heated in a heating vessel for heating by putting the wood flour under reduced pressure, and the wood flour is heated to 200 to 300 ° C. at a high temperature. Even if it heat-processes, it can prevent that wood powder deteriorates by oxidation. When the pressure is reduced, the pressure is preferably 200 mmHg or less, and a vacuum may be used. Another method is to replace the atmosphere in the heating vessel with a gas other than oxygen. Nitrogen is preferable because it is contained in air.
The heat treatment is performed in an atmosphere containing nitrogen of at least%, and even in this case, even if the wood powder is heated at a high temperature of 200 to 300 ° C., the wood powder can be prevented from being deteriorated by oxidation. As described above, when a mixture of wood flour and a thermoplastic synthetic resin or only wood flour is subjected to heat treatment, if heat treatment is performed with stirring, the wood flour can be heat-treated in a short time by stirring because the element is small.

Next, an embodiment of the present invention will be described.

[0024]

Examples (Examples and Comparative Examples of First Embodiment) (Example 1) 40 parts by weight of wood flour pulverized until 95% or more of the total wood flour becomes 300 μm or less, 45 parts by weight of polypropylene pellets, 5 parts by weight of denatured polypropylene and 10 parts by weight of talc were heated and kneaded, and extruded by an extruder to obtain a composite of wood flour and a synthetic resin. (Example 2) 30 parts by weight of wood powder, 45 parts by weight of polypropylene pellets, 5 parts by weight of denatured polyethylene, and 20 parts by weight of aluminum hydroxide were kneaded by heating and kneading until 95% or more of all the wood powder became 300 μm or less. Extrusion was performed with an extruder to obtain a composite of wood flour and a synthetic resin. (Example 3) 30 parts by weight of wood powder, 35 parts by weight of polypropylene pellets, 5 parts by weight of modified polypropylene, and 30 parts by weight of calcium carbonate, which were pulverized until 95% or more of all the wood powder became 300 μm or less, were heated and kneaded and extruded. Extrusion was performed with a molding machine to obtain a composite of wood flour and a synthetic resin. (Example 4) 30 parts by weight of wood powder, 45 parts by weight of polypropylene pellets, 5 parts by weight of modified polypropylene, and 20 parts by weight of mica, which were pulverized until 95% or more of all the wood powder became 300 μm or less, were extruded and extruded. It was extruded with a machine to obtain a composite of wood flour and a synthetic resin. (Example 5) 30 parts by weight of wood flour, 45 parts by weight of polypropylene pellets, 5 parts by weight of modified polypropylene, and 20 parts by weight of shirasu balloon were kneaded by heating and kneading until 95% or more of all wood flour became 300 μm or less, and extruded. Extrusion was performed with a molding machine to obtain a composite of wood flour and a synthetic resin. (Example 6) 30 parts by weight of wood flour pulverized until 95% or more of the whole wood flour becomes 300 μm or less, 45 parts by weight of polypropylene pellets, 5 parts by weight of modified polypropylene, 20 parts by weight of pearlite, silane coupling agent 0.1 part by weight. One part by weight was heated and kneaded, and extruded by an extruder to obtain a composite of wood flour and a synthetic resin. (Comparative Example 1) 50 parts by weight of wood flour, 45 parts by weight of polypropylene pellets, and 5 parts by weight of denatured polypropylene were heated and kneaded, and extruded by an extruder. It was molded to obtain a composite of wood flour and a synthetic resin.

The moisture content and the dimensional change of each of the above Examples 1 to 6 and Comparative Example 1 were determined when they were placed in an environment at a temperature of 40 ° C. and a humidity of 90% for 120 hours.
The water absorption when water was absorbed for an hour was determined, and the heat resistance (thermal dimensional change at 80 ° C.) was determined. The results are shown in Table 1 below.

[0026]

[Table 1] (Examples and Comparative Examples of the Second Embodiment) (Example 7) 97 parts by weight of wood flour pulverized until 95% or more of the whole wood flour becomes 300 μm or less, 3 parts by weight of maleic anhydride, 0 sodium acetate 1 part by weight was stirred and mixed to prepare a treated wood flour, and 50 parts by weight of the treated wood flour, 45 parts by weight of polypropylene pellets, and 5 parts by weight of denatured polypropylene were heated and kneaded, and extruded and formed by an extruder. And a synthetic resin. (Example 8) 95 parts by weight of wood flour pulverized until 95% or more of the whole wood flour becomes 300 µm or less, and 5 parts by weight of maleic anhydride, were stirred and mixed to prepare a treated wood flour.
0 parts by weight, 45 parts by weight of polypropylene pellets, 4 parts by weight of denatured polypropylene, and 1 part by weight of glycerin were heated and kneaded and extruded by an extruder to obtain a composite of wood flour and a synthetic resin. Example 9 98 parts by weight of wood powder, 2 parts by weight of maleic anhydride, and 0.1 part by weight of sodium acetate, which were ground until 95% or more of all the wood powder became 300 μm or less, were mixed by stirring. 40 parts by weight of this treated wood flour, 50 parts by weight of polypropylene pellets, 8 parts by weight of denatured polypropylene,
2 parts by weight of pentaerythritol were heated and kneaded and extruded by an extruder to obtain a composite of wood flour and a synthetic resin. (Example 10) 98 parts by weight of wood flour pulverized until 95% or more of all wood flour becomes 300 μm or less, maleic anhydride 2
Parts by weight and 0.1 parts by weight of sodium acetate are stirred and mixed to prepare treated wood flour, and 60 parts by weight of the treated wood flour, 35 parts by weight of polypropylene pellets, 3 parts by weight of modified polypropylene, and 2 parts by weight of glyoxal are heated and kneaded. The mixture was extruded with an extruder to obtain a composite of wood flour and a synthetic resin. (Example 11) 49 parts by weight of wood flour pulverized until 95% or more of the whole wood flour becomes 300 µm or less, maleic anhydride 1
Parts by weight, 0.1 part by weight of sodium acetate, 45 parts by weight of polypropylene, 4 parts by weight of modified polypropylene, and 1 part by weight of glutaraldehyde are simultaneously heated and kneaded, and extruded by an extruder to form a composite of wood flour and synthetic resin. I got something. (Comparative Example 2) 50 parts by weight of wood flour and 45 parts by weight of polypropylene pellets in which 20% of the whole wood flour had an internal particle diameter of 400 µm or more were heated and kneaded at 150 ° C and extruded by an extruder. A composite of wood flour and a synthetic resin was obtained.

The moisture content and the dimensional change of each of the above Examples 7 to 11 and Comparative Example 2 were determined when they were placed in an environment at a temperature of 40 ° C. and a humidity of 90% for 120 hours.
The water absorption when the water was absorbed for 4 hours was determined. The results are shown in Table 2 below.

[0028]

[Table 2] (Examples and Comparative Examples of the Third Embodiment) (Example 12) 50 parts by weight of wood flour pulverized until 95% or more of all wood flour becomes 300 μm or less, 45 parts by weight of polypropylene pellets, 5 parts by weight of modified polypropylene Part 25
It is put in a heating vessel heated to 0 ° C., and brought into a reduced pressure state (200 mmHg) while stirring and mixing. After maintaining this state for 10 minutes, the pressure is released to obtain a resin composition containing heat-treated wood flour. This was further extruded with an extruder to obtain a composite of wood flour and a synthetic resin. (Example 13) 30 parts by weight of 50 parts by weight of wood flour, 45 parts by weight of polypropylene pellets, and 5 parts by weight of denatured polypropylene were pulverized until 95% or more of all the wood flour became 300 μm or less.
It is placed in a heating vessel heated to 0 ° C., and brought into a reduced pressure state (50 mmHg) while stirring and mixing. After maintaining this state for 5 minutes, the pressure is released to obtain a resin composition containing heat-treated wood flour. This was further extruded with an extruder to obtain a composite of wood flour and a synthetic resin. (Example 14) 30 parts by weight of wood powder, 65 parts by weight of polypropylene pellets, and 5 parts by weight of modified polypropylene were pulverized until 95% or more of all the wood powder became 300 μm or less.
It is placed in a heating vessel heated to 0 ° C., and brought into a reduced pressure state (50 mmHg) while stirring and mixing. After maintaining this state for 5 minutes, the pressure is released to obtain a resin composition containing heat-treated wood flour. This was further extruded with an extruder to obtain a composite of wood flour and a synthetic resin. Example 15 Heating 30 parts by weight of wood powder, 65 parts by weight of polypropylene pellets, and 5 parts by weight of modified polypropylene heated to 300 ° C. in a nitrogen atmosphere until 95% or more of all the wood powder became 300 μm or less. Place in a container and mix with stirring. After maintaining this state for 5 minutes, a resin composition containing heat-treated wood flour is obtained. This was further extruded with an extruder to obtain a composite of wood flour and a synthetic resin. (Example 16) Wood flour crushed until 95% or more of all wood flour becomes 300 µm or less is placed in a heating vessel heated to 350 ° C under a nitrogen atmosphere, and stirred and mixed. This state is 5
And heat-treated wood flour. 50 parts by weight of this heat-treated wood powder, 45 parts by weight of polypropylene pellets, and 5 parts by weight of modified polypropylene are heated and kneaded to obtain a resin composition containing wood powder. This was further extruded with an extruder to obtain a composite of wood flour and a synthetic resin. (Example 17) Wood flour crushed until 95% or more of all wood flour becomes 300 µm or less is placed in a heating vessel heated to 350 ° C under a nitrogen atmosphere, and stirred and mixed. This state is 5
And heat-treated wood flour. 70 parts by weight of this heat-treated wood powder, 25 parts by weight of polypropylene pellets, and 5 parts by weight of modified polypropylene are heated and kneaded to obtain a resin composition containing wood powder. This was further extruded with an extruder to obtain a composite of wood flour and a synthetic resin. (Comparative Example 3) 50 parts by weight of wood flour, 45 parts by weight of polypropylene pellets, and 5 parts by weight of denatured polypropylene kneaded at room temperature were kneaded at room temperature, and the mixture was extruded. It was extruded with a machine to obtain a composite of wood flour and a synthetic resin.

Examples 12 to 17 and Comparative Example 3
The water content and the dimensional change were determined when the sample was placed in an environment of a temperature of 40 ° C. and a humidity of 90% for 120 hours.
Determine the water absorption rate when water is absorbed for 24 hours, and
Preservative evaluation was required. The results are shown in Table 3 below.

[0030]

[Table 3]

[0031]

According to the first aspect of the present invention, in a wood flour-containing resin composition comprising wood flour and a thermoplastic synthetic resin, the particle size of the wood flour is 95% or more and 300 μm or less. There is an advantage that wood powder with a small particle size is uniform, uniform kneading with the thermoplastic synthetic resin, bonding (compositing) with the thermoplastic synthetic resin is easy to occur, and water resistance and dimensional stability are improved. is there.

According to the invention of claim 2, in addition to the effects of the invention of claim 1, an inorganic substance is added to a wood flour-containing resin composition comprising wood flour and a thermoplastic synthetic resin. Therefore, water resistance, dimensional stability and heat resistance are improved by adding an inorganic substance.

According to the third aspect of the present invention, in addition to the effects of the second aspect, the inorganic substance may be at least one of talc, calcium carbonate, shirasu balloon, pearlite, aluminum hydroxide, and mica. By adding one or more, water resistance, dimensional stability, and heat resistance can be improved with a suitable material.

According to the fourth aspect of the present invention, in addition to the effects of the second aspect of the present invention, an inorganic substance is contained in an amount of 1-5.
Since 0 parts by weight are blended, it is possible to improve water resistance, dimensional stability, and heat resistance by inorganic substances with a preferable blend.

According to a fifth aspect of the present invention, in addition to the effects of the first aspect of the present invention, a resin containing wood flour comprising a wood flour and a thermoplastic synthetic resin is provided. Since the coupling agent is added to the composition, the compatibility between the wood flour and the thermoplastic synthetic resin or between the wood flour, the thermoplastic synthetic resin and the inorganic material can be improved.

According to the sixth aspect of the present invention, in addition to the effects of the first or second aspect, the wood flour is treated with an acid anhydride. And the thermoplastic synthetic resin have increased compatibility, and the material can be homogenized and composited (bonding of wood flour and thermoplastic synthetic resin).
It also improves physical properties such as water resistance and dimensional stability.

According to the invention of claim 7, in addition to the effect of the invention of claim 6, since the acid anhydride is maleic anhydride, the wood powder is preferably treated with the acid anhydride. Is what you can do.

According to the eighth aspect of the present invention, in addition to the effects of the first or second aspect, the sixth or seventh aspect, the wood powder and the thermoplastic synthetic resin are used. Since a thermoplastic synthetic resin denatured with an acid anhydride is added to the resin composition containing wood powder, the compatibility between the wood powder and the thermoplastic synthetic resin is increased, and the water resistance and dimensional stability are further improved. is there.

According to the ninth aspect of the present invention, in addition to the effect of the eighth aspect, a thermoplastic synthetic resin denatured with maleic acid is added. It can be modified with an acid anhydride.

In the invention according to claim 10,
In addition to the effect of the ninth aspect of the present invention, since a compound having an OH group or a CHO group is added, the physical properties can be further improved because the wood powder itself or the wood powder and the thermoplastic synthetic resin are crosslinked. You can do it.

According to the eleventh aspect of the present invention,
In addition to the effects of the invention of claim 10, the compound having an OH group is glycerin, ethylene glycol, pentaerythritol, and the compound having a CHO group is glyoxal or glutaraldehyde. A compound having a group can be added.

According to the twelfth aspect of the present invention,
In addition to the effects of the invention described in claim 1 or 2,
Since the mixture of wood flour and the thermoplastic synthetic resin or only wood flour is heat-treated at 200 to 300 ° C., wood is more water-resistant because heat treatment improves the water resistance and dimensional stability. In particular, wood flour can be heat-treated in a short time by stirring the wood flour since the element is small.

In the invention according to claim 13,
In addition to the effect of the twelfth aspect of the present invention, since the heat treatment is performed under reduced pressure, the wood powder is heat-treated to improve the water resistance and dimensional stability of the wood powder. Regardless, the wood powder is prevented from being oxidized and has no adverse effect due to the heat treatment.

In the invention according to claim 14,
In addition to the effect of the invention of claim 12, since the heat treatment is performed in an atmosphere containing 95% or more of nitrogen, the wood powder is heat-treated to improve the water resistance and dimensional stability of the wood powder. In spite of the improvement, the oxidation of the wood powder is prevented, and there is no adverse effect due to the heat treatment.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/07 C08K 5/07 5/103 5/103 C08L 101/00 C08L 101/00 (72) Inventor Satoru Konishi 1048, Kadoma, Kazuma, Kazuma, Osaka Pref. (72) Inventor Masasuke Tsukamoto 1048, Kazuma, Kazuma, Kadoma, Osaka Pref. 1048 Oaza Kadoma Matsushita Electric Works Co., Ltd. F-term (reference) 4J002 AH00X BB03W BB12W BB213 DE146 DE236 DJ006 DJ046 DJ056 EC049 EC059 EE019 EL148 EX007 FA106 FB01X FB23X GL00

Claims (14)

[Claims] 1. A wood flour-containing resin composition comprising wood flour and a thermoplastic synthetic resin, wherein the particle size of the wood flour is 3% or more.
A wood powder-containing resin composition having a particle size of not more than 00 μm. 2. The wood flour-containing resin composition according to claim 1, wherein an inorganic substance is added to the wood flour-containing resin composition comprising wood flour and a thermoplastic synthetic resin. 3. The wood flour-containing resin composition according to claim 2, wherein the inorganic substance is at least one of talc, calcium carbonate, shirasu balloon, perlite, aluminum hydroxide, and mica. 4. The resin composition containing wood powder according to claim 2, wherein 1 to 50 parts by weight of an inorganic substance is blended. 5. The resin composition containing wood powder according to claim 1, wherein a coupling agent is added to the resin composition containing wood powder composed of wood powder and a thermoplastic synthetic resin. object. 6. The wood flour-containing resin composition according to claim 1, wherein the wood flour is treated with an acid anhydride. 7. The wood flour-containing resin composition according to claim 6, wherein the acid anhydride is maleic anhydride. 8. A resin composition containing wood flour and a thermoplastic synthetic resin, wherein a thermoplastic synthetic resin denatured with an acid anhydride is added to the resin composition containing the wood flour. Item 8. The resin composition containing wood flour according to Item 6 or 7. 9. The wood flour-containing resin composition according to claim 8, wherein a thermoplastic synthetic resin modified with maleic anhydride is added. 10. The wood flour-containing resin composition according to claim 9, wherein a compound having an OH group or a CHO group is added. 11. The compound having an OH group is glycerin,
Ethylene glycol, pentaerythol, CHO
The wood powder-containing resin composition according to claim 10, wherein the compound having a group is glyoxal or glutaraldehyde. 12. The resin containing wood flour according to claim 1, wherein the mixture of wood flour and the thermoplastic synthetic resin or only the wood flour is heat-treated at 200 to 300 ° C. Composition. 13. The wood flour-containing resin composition according to claim 12, which is heat-treated under reduced pressure. 14. The heat treatment is performed under an atmosphere containing 95% or more of nitrogen.
2. The resin composition containing wood flour according to 2.