JP2000301670A - Woody material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the enhancement of strength and the lowering of thermal expansion without damaging weatherability in a woody material compounded with wood flour and to sharply develop the feel or pattern having a woody feeling in appearance in spite of large wall thickness. SOLUTION: A surface layer portion 2 is integrally applied to the periphery of a core material portion 1 and both of the core material portion 1 and the surface layer portion 2 are formed from a colored plastic material compounded with wood flour. By increasing the thickness of the core material portion 1 to increase the compounding amt. of wood flour, the enhancement of strength and the lowering of thermal expansion can be achieved and, by reducing the thickness of the surface layer portion 2, the feel or pattern having a woody feeling can be sharply developed in appearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to flooring materials for buildings such as terraces, balconies, restaurants, station plazas, promenades in parks, ponds, wooden bridges hanging over spring water, wooden paths passed to wetlands in natural parks, and the like. The present invention relates to a wood-like material that is preferably used.

[0002]

2. Description of the Related Art Conventionally, natural wood is used for indoor and outdoor flooring materials, promenades, wooden bridges, wooden paths, etc. exposed to the weather, but it is inferior in abrasion and corrosion when exposed to the weather. And has the disadvantage of being inferior in durability.

[0003]

On the other hand, as a substitute for natural wood, there is a wood-like material obtained by molding a colored synthetic resin material containing wood flour by extrusion molding, injection molding or the like. Such a wood-like material is made of a colored synthetic resin without blending wood flour, except that a woody texture and a pattern appear in the appearance by the wood flour and the coloring pigment blended in the colored synthetic resin material. Compared to wood-like materials made of only materials, wood-like materials have attracted attention recently because they can improve strength by wood flour, lower the coefficient of thermal expansion, and make it harder to deform by heat. one of.

[0004]

However, although the strength and the coefficient of thermal expansion can be improved by blending wood flour, wood flour is poor in weather resistance and chemical resistance. If the proportion is increased, there is a problem that weather resistance and chemical resistance are reduced. In order to improve weather resistance, additives such as an ultraviolet absorber may be blended, or a synthetic resin material having excellent weather resistance may be used. Synthetic resin materials having excellent properties are expensive and are not economically preferable. In terms of external appearance, the flow characteristics of the synthetic resin material become relatively uniform when the thickness is thin, so that the woody texture and pattern appear clearly in the appearance. Is not uniform, so that there is a problem that the appearance is unclear.

[0005] Therefore, in wood-like materials containing wood flour, the above-mentioned problems can be solved, the strength can be improved and the coefficient of thermal expansion can be reduced without impairing the weather resistance. It is an object of the present invention to provide a wood-like material capable of clearly presenting a texture or pattern with a distinct appearance.

[0006]

Means for Solving the Problems In order to achieve the above object, the present inventor has conducted intensive studies and found that a wood-like material is composed of a core material portion and a surface layer portion attached and integrated around the core material portion. In addition, if the core portion and the surface layer portion are both formed of a colored synthetic resin material mixed with wood flour, by increasing the amount of wood flour blended with the core, the strength can be improved and the coefficient of thermal expansion can be reduced. Performance can be improved and woody textures and patterns can be clearly shown on the surface at the surface layer.Additionally, even if the core material has a problem with weather resistance, additives can be added to the surface layer. The weather resistance can be improved by blending or reducing the blending amount of wood flour, and when additives are blended, only the surface layer is sufficient, so the amount of additives is small, and the weather resistance is economically improved. Knowing that it can be improved, etc. It was.

That is, the wood-like material according to the present invention has a core portion and a surface layer attached and integrated around the core portion, and both the core portion and the surface portion are made of wood. It is characterized by being formed from a colored synthetic resin material mixed with powder.

According to the present invention, the surface layer is adhered and integrated around the core, and both the core and the surface are formed from a colored synthetic resin material mixed with wood flour. Therefore, by increasing the amount of wood flour by increasing the thickness of the core material, it is possible to improve performance such as improving strength and lowering the coefficient of thermal expansion. Can clearly appear on the appearance. Moreover, the core part may be made of discarded colored synthetic resin material, and the amount of wood powder may be increased. Even if this causes a problem in weather resistance, it is added to the surface layer covering the core part. The weather resistance can be improved by compounding the agent or reducing the amount of wood flour. When the additive is compounded, only the surface layer is required, so the amount of the additive is small, and the weather resistance is economical. Can be improved.

Further, since wood flour is also blended into the core material portion, even if cut into a predetermined length and used, the cut surface also has a woody texture and pattern on the appearance. It is also possible to use it by exposing the cut surface like a natural tree.

[0010]

Next, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention.
Is a surface layer portion attached and integrated around the core material portion 1. The thickness of the core portion 1 is not particularly limited, and may be thin, but a thickness of about 20 mm or more that can increase the blending amount of wood powder to improve strength and reduce the expansion coefficient. Meat is preferred. In addition, the thickness of the surface layer portion 2 is thinner than the thick portion so that the woody texture and pattern can be clearly seen in the appearance, and the weather resistance is improved by blending additives such as an ultraviolet absorber. In order to improve the quality, the thinner the thickness is, the smaller the amount of the additive is, which is economical.
m.

The core 1 and the surface 2 are both made of a colored synthetic resin material mixed with wood flour and colored with a coloring pigment. The type of wood flour is not particularly limited as long as it is a crushed plant fiber,
Coniferous species such as cedar and hemlock are commonly used,
A particle size of about 30 to 120 mesh is public. The mixing ratio of the wood powder is preferably 20 to 150 parts by weight based on 100 parts by weight of the synthetic resin material.
If the amount is less than 0 parts by weight, a sufficient woody feeling cannot be obtained.
When the amount exceeds the weight part, the appearance is not smooth.

[0012] In addition to the above-mentioned wood flour, a coloring pigment for producing a woody feeling in combination with the wood flour is blended, and if necessary, a filler such as calcium carbonate and stone powder, a foaming agent, a foaming aid, an ultraviolet ray Additives such as an absorbent and an antistatic agent may be blended.

As the synthetic resin used as the colored synthetic resin material, any synthetic resin such as extrusion molding, injection molding or the like can be used, and examples thereof include polyvinyl chloride, ABS resin, polyamide and acrylic resin. Such as thermoplastic synthetic resin, other phenolic resin, polyester,
Thermosetting synthetic resins such as urea resins can also be used, but for reasons of environmental hormones, for example, polyethylene, polypropylene, polybutene, polyisoprene, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer,
Those containing a polyolefin resin as a main component such as an ethylene α-olefin copolymer and an olefin elastomer are preferred. Colored synthetic resin materials are formed into powder or pellets by mixing these synthetic resins with the above-mentioned wood flour, color pigments, and other suitable fillers, additives, and the like. It is formed into a desired shape such as a shape. In order to adhere and integrate the surface layer 2 around the core 1, it is preferable that the surface 2 is integrally molded at the time of molding such as extrusion molding or injection molding, but it may be adhered in a later step.

In order to effectively bring out the texture and pattern with a woody feel to the appearance of the surface layer 2, a colored synthetic resin material mixed with wood flour forming the surface layer 2 is colored in different colors. In addition, a mixture of a plurality of colored synthetic resin materials can be used. By using a mixture of a plurality of colored synthetic resin materials colored in different tones as described above, in addition to wood flour, a woody feeling is also exhibited by a color pattern generated at the time of molding due to a difference in tone. . In this case, the wood powder may be mixed with any of the colored synthetic resin materials, but it is preferable to mix the wood powder with all the colored synthetic resin materials because the wood powder is well dispersed.

In the case where a mixture of a plurality of colored synthetic resin materials mixed with wood flour and colored in different colors is used as the colored synthetic resin material forming the surface layer portion 2, the mixed colored synthetic resin material is used. The melt viscosities of the materials may be the same, but if different melt viscosities are mixed, a color pattern giving a woody feeling is likely to appear due to differences in fluidity. preferable.

When different melt viscosities are mixed, it is preferable that the difference between the melt viscosities is large, since a color pattern giving a woody feeling is likely to appear, but if the melt viscosity is low, the wood powder is difficult to disperse. On the other hand, if it is large, the moldability deteriorates. For example, the MI (melt index) of one colored synthetic resin material is about 10 to 20 and the MI of the other colored synthetic resin material is about 1 to 5 Is preferred.

The melting points of the plurality of colored synthetic resin materials to be mixed may be the same, but those having different melting points are mixed with each other due to the difference in flowability as in the case of the melt viscosity. This is preferable because a color pattern giving a texture is likely to appear. In this case, a plurality of colored synthetic resin materials having the same melting point and different colors may be mixed with other colored synthetic resin materials having different melting points and different colors.

When different melting points are mixed,
If the difference between the melting points is large, it becomes impossible to melt the high melting point and the low melting point properly, so that the difference in the melting points is preferably suppressed to about 2 to 5 ° C.

The amounts of the wood flours respectively mixed in the plurality of colored synthetic resin materials to be mixed may be the same, but those having different amounts are mixed.
Similar to the above-mentioned melt viscosity, it is preferable because a pattern giving a woody feeling is likely to appear due to a difference in fluidity. It is preferable that the wood powder is blended in an amount of 20 to 150 parts by weight based on 100 parts by weight of the resin component in each of the colored synthetic resin materials to be mixed. It is preferable to carry out melt mixing by a machine.

It is preferable to use wood flour impregnated with a coloring pigment in all or any of the plurality of colored synthetic resin materials to be mixed. By doing so, the dispersibility of the color pigment is suppressed, and a pattern giving a woody feeling is likely to appear even with the color pigment.

The larger the difference in hue between the plurality of colored synthetic resin materials to be mixed, the clearer the pattern that appears.

As described above, when a mixture of a plurality of colored synthetic resin materials mixed with wood flour and colored in different tones is used as the colored synthetic resin material forming the surface layer portion 2, The synthetic resin materials preferably have different melt viscosities, melting points, wood powder blending amounts, hues, etc., and may be used in combination.

For example, if four types of colored synthetic resin materials A to D having the same amount of wood flour and different hue are mixed and used, all of the colored synthetic resin materials B to D have the same melt viscosity and melting point. The colored synthetic resin material A can have a melt viscosity and a melting point different from those of the colored synthetic resin materials BD.

The surface layer 2 can be provided with other additional functions. For example, a linear non-slip layer made of an olefin-based thermoplastic elastomer having little water absorption and good adhesion to the surface layer 2 may be formed on the surface of the surface layer 2, A wood texture may be emphasized by subjecting the surface to a graining process or a sanding process.

Next, since the core part 1 does not appear in appearance,
The amount of wood flour can be increased as much as possible,
By increasing the blending amount, the strength can be improved and the coefficient of linear expansion can be reduced. The colored synthetic resin material used is
A discarded colored synthetic resin material may be used and is not particularly limited.

[0026]

According to the present invention, the surface layer is adhered and integrated around the core, and both the core and the surface are formed from a colored synthetic resin material mixed with wood flour. By increasing the amount of wood flour by increasing the thickness of the core material, it is possible to improve performance such as improving strength and lowering the coefficient of thermal expansion, and at the same time, to make the surface layer thinner and give it a woody texture. And patterns can clearly appear on the appearance. Moreover, the core part may be made of discarded colored synthetic resin material, and the amount of wood powder may be increased. Even if this causes a problem in weather resistance, it is added to the surface layer covering the core part. The weather resistance can be improved by compounding the agent or reducing the amount of wood flour. When the additive is compounded, only the surface layer is required, so the amount of the additive is small, and the weather resistance is economical. Can be improved.

Furthermore, since wood flour is also blended into the core material, even when cut into a predetermined length and used, the cut surface also has a woody texture and pattern on the appearance. It is also possible to use it by exposing the cut surface like a natural tree.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Core part 2 Surface part

Continued on the front page F-term (reference) 4F100 AA08H AJ02A AJ02B AJ02H AK01 AK01A AK01B AK03A AK03B AK15 AK74 AP10A AP10B AP10H BA02 CA13A CA13B CA23A CA23B DD31 DE01A DE01B DE01H EJ27 GB02H00

Claims (4)

[Claims] 1. A colored synthetic resin having a core part and a surface part integrally adhered around the core part, wherein both the core part and the surface part are mixed with wood powder. A wood-like material characterized by being formed from a material. 2. The colored synthetic resin material forming the surface layer portion,
The wood-like material according to claim 1, wherein a plurality of colored synthetic resin materials mixed with wood flour and colored in different colors are mixed. 3. A colored synthetic resin material containing wood flour for forming a core portion and / or a surface layer portion is mainly composed of a polyolefin-based synthetic resin. Wood-like material described in. 4. The wood-like material according to claim 1, wherein the wood powder is impregnated with a coloring pigment.