JP2000141322A - Woody resin molding and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate drying of cellulosin and turn a resin into a foamed state without employing a foaming agent in the manufacturing of the woody resin molding made of a resin mixed with the cellulosin. SOLUTION: This woody resin molding 1 is produced by forming the mixture of cellulosin 2, on the surface of each of which titanium oxide particles 3 are fixed, a resin 4 and a coloring material such as pigment, dye and the like. The water content of the cellulosin 2 is set to be 8-22%. As the resin 4, an ABS resin is employed. Since the water content of the cellulosin 2 mixed with the resin 4 is high, the removal of the water content through a thermal drying is not necessary. Further, since sufficient water content is included in the cellulosin 2, the water content evaporates at the melting for forming the resin 4 containing the cellulosin 2, resulting in forming bubbles 5 in the resin 4. In other words, the resin 4 shows a foamed state without addition of a foaming agent, resulting in allowing to turn the woody resin molding 1 into one having a texture similar to a wood.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood-like resin molded product having a texture and color close to that of wood and a method for producing the wood-like resin molded product.

[0002]

BACKGROUND ART In recent years, effective use of wood resources has been desired from the viewpoint of forest protection. On the other hand, wood, which is a natural material, is disadvantageous in that it is uneven and easily breaks or warps.Development of a wood reforming technology to improve these disadvantages and make use of the advantages of wood Is desired. The present applicant has already proposed a wood-like product (patent number, 1996-2544310) as a composite material composed of resin and wood to meet these demands.

[0003] The above-mentioned woody product basically has a particle material smaller in diameter than the particle, for example, a particle of titanium oxide, supported on the surface of granular particles of wood (wood flour). Wood powder, a resin, and a coloring material such as a pigment or a dye are mixed, and a mixture of the wood powder, the resin, and the coloring material is formed. The wood-like product can effectively use wood resources by using wood that has been discarded as wood flour, and
By containing a large amount of wood flour, it has a texture close to that of wood, and is a composite material excellent in moldability similar to general resins.

[0004] As a foamed resin obtained by adding wood powder, for example, a woody foamed resin molded product disclosed in Japanese Patent Application Laid-Open No. 59-56431 is known. The purpose of the present invention is to increase the strength of the foamed resin by adding wood flour and to make the foamable resin have characteristics similar to wood. In wood-like products made by adding wood flour to resin,
It is effective to foam the resin in order to make the weight or the like close to that of wood or to further reduce the weight.

[0005]

In the case where the above-mentioned woody product is foamed, a foaming agent is naturally required. On the other hand, wood flour used in wood-like products may have an adverse effect on wood-like products due to moisture or other components contained in wood flour being vaporized or released by heat during molding. Therefore, it was necessary to heat and dry.

[0006] Further, when producing a member like the above-mentioned wood-like product to which an impact force is likely to be applied, such as a handrail, for example, in a wood-like product using vinyl chloride as a resin, metal Such a core material is put in, and the surroundings are covered with a wood-like product, so that the required strength can be obtained by the core material, which is costly.

The present invention has been made in view of the above circumstances, and does not require heat-drying of wood flour and, to some extent without using a foaming agent, provides a texture closer to wood. It is an object of the present invention to provide a woody resin molded article having the same and a method for molding the woody resin molded article.

[0008]

Means for Solving the Problems A wood-like resin molded product according to claim 1 of the present invention is obtained, for example, by mixing at least wood powder 2 with resin 4 and molding as shown in FIG. The water content of the wood flour 2 is more than 8% by weight and not more than 22% by weight, and in the process of molding the resin 4, the water contained in the wood flour 2 The formation of bubbles 5 in the resin by evaporation in the resin is a means for solving the above problem. According to the above-described configuration, the water content of the wood flour 2 is more than 8% by weight and 22% by weight or less.
Moisture content (air-dry moisture content) when the wood is dried in a state where it is left unattended is, for example, 1%.
The moisture content of the wood flour 2 is within the above range, it is sufficient that the wood flour is left to dry at room temperature and does not need to be heated and dried. 2 ...
Can be used.

When the resin 4 containing the wood flour 2 having a water content within the above range is molded by, for example, heating and melting, the water in the wood flour 2 evaporates, Since this is held in the resin 4 as bubbles 5.
The resin 4 is in a foamed state. That is, the foamed resin 4 can be obtained without using a known foaming agent.
Then, by foaming the resin 4 as described above,
A texture closer to wood can be obtained by including air, and the apparent specific gravity can be reduced by foaming.

According to a second aspect of the present invention, in the wood-like resin molded product 1, the resin 4 is made of acrylonitrile-butadiene-.
A styrene resin (hereinafter referred to as an ABS resin) is a means for solving the above problem. According to the above configuration, the resin 4 is made of ABS resin having excellent impact resistance, so that the wood-like resin molded article 1 can be used as a single member such as a short handrail without a metal core or the like. It can have sufficient strength. In addition, resin 4 is
By using the S resin, as described above, even if the water content of the wood flour 2 is increased, no particular inconvenience occurs.
A foamed molded article can be obtained.

The woody resin molded article 1 according to claim 3 of the present invention is characterized in that an antimicrobial agent is added. According to the above configuration, the growth of microorganisms such as bacteria and mold on the surface of the wood-like resin molded product 1 can be suppressed, and it can be kept as clean as possible.
Dirt due to propagation of microorganisms can be prevented. As the antibacterial agent, known organic antibacterial agents and fine particles containing metal ions, for example, fine particles of zinc oxide, silver oxide, copper oxide, and the like can be used. In addition, titanium oxide can be used as an antibacterial agent. Titanium oxide is
When it functions as a photocatalyst, it emits holes and electrons on the surface of titanium oxide when exposed to ultraviolet rays contained in sunlight, fluorescent lamps, etc., and air (oxygen or vapor) comes into contact with it,
Active oxygen such as superoxide ions and hydroxyl radicals are generated, and a strong oxidative decomposition action is produced, and sterilization, deodorization and the like are performed.

The wood-like resin molded article 1 according to claim 4 of the present invention is characterized in that hard particles having a smaller diameter than the wood flour 2 are fixed to the outer peripheral surface of the wood flour 2. The solution. According to the above configuration, the wood flour 2
… By having smaller diameter and hard particles fixed,
Even if heat is applied to the wood flour 2 ... during molding, the grains are wood flour 2 ...
Can be protected from heat to prevent wood flour 2 from burning and discoloring to brown or black. In addition, by covering the periphery of the wood flour 2 with the above-described particles, the dispersibility of the wood flour 2 can be improved, and the wood flour 2 can be uniformly dispersed in the resin 4. In addition, by covering the surface of the wood flour 2 with the particles, it is possible to prevent the components contained in the wood flour 2 that has not been heated and dried from being released into the resin 4 and adversely affecting the resin 4. . In addition, if the particles have physical, chemical, and electrical characteristics, these characteristics can be added to the wood-like resin molded product 1.

The above-mentioned particles may be any particles which are smaller in diameter and harder than the wood flour 2, and are inorganic particles, pigment particles, conductive particles, resin particles and the like. Particles 3, lithopone, metal particles such as silver, copper and nickel, conductive metal oxide particles such as tin oxide and zinc oxide, and carbon particles can be used. In particular, as the above-mentioned particles, titanium oxide particles 3 can be preferably used. By fixing the titanium oxide particles around the wood flour 2, the dispersibility of the wood flour 2 in the resin 4 can be improved. By using titanium oxide which is basically white, the color of the wood-like resin molded product 1 can be made a color close to white wood. Also, as described above, titanium oxide has
It has a deodorizing and bactericidal action, and by exposing titanium oxide to the surface of the wood-like resin molded article 1, the antibacterial and deodorizing action of the wood-like resin molded article 1 can be achieved without further adding an antibacterial agent. You can have.

The woody resin molded article 1 according to the fifth aspect of the present invention is installed in a bathroom, a toilet, an entrance, or the like, and is formed into, for example, a handrail 10 shown in FIG. did. Basically, the wood-like resin molded article 1 can be applied to almost any member as long as the resin 4 can be used. You can get a sense of luxury compared to. Particularly, the resin 4 used in the woody resin molded product 1 is made of ABS.
If it is made of resin, it can be made relatively excellent in impact resistance, so that it is often grasped by hand and can be effectively used for the handrail 10 which is likely to be subjected to impact. In addition to the handrail 10, a door handle which is often gripped by hand, a towel rail on which an object is hung, and the like are also suitable as the wood-like resin molded article 1 using the ABS resin.

According to a sixth aspect of the present invention, in the method for producing the woody resin molded article 1, at least the wood flour 2 is mixed with the resin 4, and the water content of the wood flour 2 is 8% by weight. In the process of molding the resin 4, the moisture contained in the wood flour 2 is evaporated in the resin 4 to form bubbles 5 in the resin 4. Is a means for solving the above-mentioned problem. According to the above configuration, it is possible to manufacture the woody resin molded article 1 having excellent effects as in the woody resin molded article 1 according to the first aspect.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a woody resin molded product and a method for manufacturing the same will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing the interior of this example of a woody resin molded product 1, and FIG.
1 shows a handrail 10 which is one example of a wood resin molded product.

As shown in FIG. 1, the wood-like resin molded article 1 basically has a smaller diameter than the wood flour 2, for example, on the surface of granular wood particles (wood flour 2 ...). Particles of titanium oxide (titanium oxide particles 3...) Are supported, and such wood flour 2
, And resin 4 and a coloring material such as a pigment or a dye, and a mixture of the wood powder 2 and the resin 4 and the coloring material is molded by a known molding method such as extrusion molding or injection molding. It is.

After the above-mentioned wood flour 2 is ground, it is ground by, for example, a ball mill or the like. It has a shape close to grains and spheres, and its bulk specific gravity is increased. Since the wood flour 2 has a shape close to particles or spheres with few protruding fibers, the fibers are not entangled with each other and aggregated, and are easily dispersed in the resin. This wood flour 2 ... is wood flour 2 ...
Is not heat-dried before and after the production stage, and has a moisture content of more than 8% by weight and 22% by weight or less. It is difficult to reduce the water pigment content of the wood flour 2 to 8% by weight or less without heating and drying. This makes it difficult for the resin 4 to foam.

In order to ensure that the water content of the wood flour 2 is greater than 22% by weight, the wood content is about 22% by weight in the state of undried raw wood. It is necessary to use freshly-wooded wood, or to spray water on wood flour 2. The wood used as the raw material of the wood flour 2 is wood scraps and sawdust used as building materials and the like. Since the wood is once left at room temperature and dried, its water content is low. The pigment is, for example, 15
% By weight to 17% by weight.

Therefore, in order to minimize the cost, it is preferable to use wood flour 2 having a water content of about 15% to 17% by weight so as not to require any treatment such as drying and addition of water. Is preferably adjusted to have a water content of 15 to 17% by weight. Further, in practice, it is conceivable that the wood flour 2 is dried by grinding the wood flour 2. In a humid state, on the contrary, the water content of the wood flour 2 may increase. , The water content of wood flour 2 ...
It is preferably 0% by weight.

If the wood flour 2... Is not dried by heating and has a relatively high moisture content, the wood flour 2. ,
The moisture contained in the wood flour 2 evaporates and bubbles 5
... will occur. That is, the resin 4 is in a foamed state. The amount of the bubbles 5 in the resin 4 is the same as the amount of the wood powder 2.
Of the wood flour 2 mixed into the resin 4.

Then, the wood flour 2...
The particles having a smaller diameter and harder than the wood flour 2 are carried, and the surface of the wood flour 2 is covered with the above-mentioned grains. In this example, titanium oxide particles 3 are used as the particles. By covering the surfaces of the wood flours 2 with the particles as described above, the dispersibility of the wood flours 2 in the resin can be increased, and the flow of the resin 4 containing a large amount of the wood flours 2 can be improved. , And the moldability of the resin 4 containing the wood flour 2 can be improved. Also, by covering the surface of the wood flour 2 with the above-mentioned particles, the wood flour 2
Can be prevented from being heated and discolored, and unnecessary substances such as wood acid and lignin can be prevented from being released from the wood flour 2 into the resin 4. Therefore, even if the wood flour is not heated and dried to remove a part of the unnecessary material, it is possible to prevent the resin 4 from being adversely affected by the unnecessary material. In addition, various characteristics can be imparted to the wood-like resin molded article 1 by using particles having various physical characteristics, chemical characteristics, electric characteristics, and the like as the above-mentioned particles.

When the titanium oxide particles 3 are used as the above-mentioned particles, since the titanium oxide is also used as a white pigment, the wood-like resin molded product 1 without any other pigment or dye is added. Color can be made close to white, it can be made close to white wood, and the original color is close to white, so by adding other pigments and dyes, the desired color can be easily obtained. Can be colored. Further, titanium oxide has a deodorizing and sterilizing function as described above, and thus can impart a deodorizing and sterilizing function to a wood-like resin molded product.

That is, by using the titanium oxide particles 3, antibacterial activity can be added to the wood-like resin molded article 1. In addition, a well-known antibacterial agent may be added to the wood-like resin molded product 1. Then, a coloring material such as a pigment or a dye is added to the resin 4 so that the color of the wood-like resin molded product 1 can be, for example, a color close to various woods. In addition, the wood-like resin molded article 1 can be provided with a striped pattern by using coloring materials such as pigments and dyes of different colors in the molding without completely mixing the same. Wood-grain patterns can be applied to the products. For example, the resin 4 to which the above-mentioned wood powder 2 is added is prepared as a pellet or a compound, and at this time, a plurality of types to which a different coloring material is added or a plurality of types to which no coloring material is added are prepared. In addition to melting and molding this, the resins of each color are melted separately at the time of melting, or as if they are melted together, so that the colors are not mixed too much without much stirring, and molded. Then, for example, a striped pattern or the like is formed on the wood-like resin molded product 1.

Further, a coloring material may be added at the time of melting, and molded before the coloring material is completely mixed. And since the woody resin molded article 1 has a striped pattern inside,
Even if the wood is cut or polished, a stripe pattern appears on the surface, and no matter how the wood is processed, the wood grain is in the same state as the wood grain appears on the surface. The resin 4 is basically
Although various thermoplastic resins and thermosetting resins can be used, it is preferable to use an ABS resin having a certain degree of impact resistance. Further, a resin having impact resistance similar to or higher than that of the ABS resin may be used, but it is necessary to use the resin in consideration of the characteristics and cost when wood powder 2 is mixed.

Next, a method for producing the woody resin molded article 1 will be described. First, wood is crushed. The wood may be softwood or hardwood. At this time, wood as a raw material is cut and crushed by a machine capable of cutting and crushing wood such as a cutter mill, and the wood is crushed to 1000 μm or less, preferably 50
Grind to particles of 0 μm or less. Note that this step is not performed when the raw material is already finely ground such as sawdust.

Next, the pulverized wood is further pulverized by a fine pulverizer such as an impeller mill or the like, which is pulverized by the action of impact, shearing, grinding, etc., to a particle size of about 200 μm or less. Next, the pulverized wood is ground by a machine such as a ball mill. At this time, the titanium oxide particles 3 are added to the ball mill at the time of grinding the wood flour 2 or after some grinding. Thus, the titanium oxide particles 3 are pressed against the surface of the wood flour 2, and the titanium oxide particles 3 are supported and fixed on the surface of the wood flour 2. When the titanium oxide particles 3 are added to the ball mill, the wood powder 2 is mixed with the titanium oxide particles 3 in advance, and the wood powder 2 is dusted with the titanium oxide particles 3. Together with the ball mill.

In the above-described wood flour production process, the wood is prevented from being heated to a high temperature of, for example, 80 ° C. or more by pulverization or grinding in various mills.
The wood flour 2 is dried by the heat or the like so that the water content does not become 8% by weight or less. More preferably, the water content is maintained at 10% by weight or more. Next, the wood powder 2 on which the titanium oxide particles 3 are fixed as described above, the resin 4 and the coloring material are mixed to form a compound.

The compound may be used to directly produce a wood-like resin molded article 1, or the compound may be melted and extruded to form pellets. Is also good. Further, molding may be performed by combining the above compound and pellets. The molding can be performed by using a known molding method such as injection molding or extrusion molding.

When the resin 4 containing the wood powder 2 is melted for molding, the moisture contained in the wood powder is
Are vaporized in the resin 4, bubbles 5 are formed in the resin 4, and the resin 4 is in a foamed state. FIG. 2 shows a handrail 10 formed by injection molding. This handrail 10 is almost entirely made of the resin 4 containing the wood flour 2... It is in a state. And handrail 10 is basically a bathroom, a toilet,
It is placed at the entrance or the like and stands or sits with the handrail 10, rather than being used to walk a long distance with the handrail, like a handrail such as a staircase. It is a relatively short one that is used for washing the feet with the handrail 10 or raising one foot to put on shoes. Needless to say, the handrail 10 may be used when walking a short distance in a bathroom, toilet, or entrance.

The handrail 10 is made of ABS as the resin 4.
By using a resin, it is possible to obtain sufficient strength by itself without using a core material made of metal or the like. In addition, the usual handrails made of resin as described above are:
The material is obviously resin, and it is difficult to give a sense of quality, etc. It can be a member.

The wood-like resin molded product is not limited to the handrail 10 described above, and can be used as various fittings, interior materials, furniture, and some of these members of a house, and various vehicles. It can be applied to interior materials of (automobiles, aircrafts, ships, trains, etc.), various office supplies, electric appliances such as home appliances and audio products, and any other objects.

[0033]

According to the wood-like resin molded product of the first aspect of the present invention, it is not necessary to heat and dry the wood flour or its raw material, and the production cost can be reduced. Also,
By using wood flour having a high moisture content, water evaporates in the resin and bubbles are generated, and the resin can be foamed without using a foaming agent, and the resin gives a texture close to wood. be able to.

According to the wood-like resin molded product of the second aspect of the present invention, the resin is an ABS resin having excellent impact resistance, so that the wood-like resin can be formed without a metal core or the like. A molded article can have sufficient strength.
Further, by using an ABS resin as the resin, as described above, even if the water content of the wood flour is increased, a molded article in a slightly foamed state can be obtained without any particular inconvenience.

According to the woody resin molded product according to the third aspect of the present invention, the growth of microorganisms such as bacteria and mold on the surface of the woody resin molded product can be suppressed, and the surface can be kept as clean as possible. In addition, contamination due to propagation of microorganisms can be prevented.

According to the woody resin molded product according to the fourth aspect of the present invention, heat is applied to the wood flour during molding because the outer periphery of the wood flour is fixed with hard particles having a smaller diameter than the wood flour. Even so, the grains protect the wood flour from heat and can prevent the wood flour from burning and turning brown or black. In addition, by covering the periphery of the wood flour with the above-described particles, the dispersibility of the wood flour can be improved, and the wood flour can be uniformly dispersed in the resin. In addition, by covering the periphery of the wood flour with the above-mentioned particles, it is possible to prevent the components that adversely affect the resin from being released from the wood flour that has not been dried by heating.

According to the wood-like resin molded product according to the fifth aspect of the present invention, when the wood-like resin molded product is applied to a handrail, the sense of quality is simply higher than when using a normal resin. Can be put out. In particular, if the resin used for the wood-like resin molded product is ABS resin, the wood-like resin molded product alone has sufficient strength as a short handrail used in bathrooms, toilets, entrances, etc., even without a core material inside. Obtainable.

According to the method for producing a wood-like resin molded product according to the sixth aspect of the present invention, a wood-like resin molded product having an excellent effect as the above-mentioned woody resin molded product is produced. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a woody resin molded product according to an embodiment of the present invention.

FIG. 2 is a plan view showing a handrail which is a woody resin molded product of the above example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wood-like resin molded article 2 Wood flour 3 Titanium oxide particles (particles) 4 Resin 5 Air bubbles 10 Handrail

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jun Tanabe 8-8 Ejidaidaicho, Shimizu-shi, Shizuoka Prefecture F-term in Cubic Co., Ltd. (Reference) 2B260 AA01 AA06 AA07 AA11 BA01 BA13 BA15 BA18 BA27 CC03 CD02 CD06 CD07 CD10 CD11 DC10 DC20 EA11 EA12 EA13 EB02 EB08 EB09 EB12

Claims (6)

[Claims] 1. A woody resin molded product obtained by mixing at least wood flour with a resin, wherein the wood flour has a water content of more than 8% by weight, and
% By weight or less, and in the process of molding the resin, the moisture contained in the wood flour evaporates in the resin to form bubbles in the resin. 2. The wood-like resin molded product according to claim 1, wherein the resin is an acrylonitrile-butadiene-styrene resin. 3. The wood-like resin molded product according to claim 1, further comprising an antimicrobial agent. 4. The wood-like resin molding according to claim 1, wherein hard particles having a smaller diameter than the wood flour are fixed to an outer peripheral surface of the wood flour. Goods. 5. The wood-like resin molded product according to claim 1, wherein the molded product is formed into a handrail installed in a bathroom, a toilet, an entrance, or the like. 6. A resin mixed with at least wood flour, wherein the wood flour contains more than 8% by weight of water,
% By weight or less, and in the process of molding the resin, the moisture contained in the wood flour is evaporated in the resin to form bubbles in the resin and molded to produce a wood-like resin molded article. Method.