JP3650138B2 - Wood-like board materials and wood-like board products - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a wood-like board material and a board product suitable for, for example, a peripheral edge and a baseboard in a house, various decorative boards such as furniture, and an interior member of a vehicle.
[0002]
[Prior art]
In recent years, attempts have been made to impart surface properties close to those of natural wood to synthetic resin moldings to make the surfaces of various furniture or daily necessities natural woody.
In order to obtain such a wood-like resin product that approximates natural wood, it is colored in a color that approximates that of wood to bring out its woody taste. During the formation, a resin molded product having a color tone and a texture close to the intended natural wood was obtained by adding a required amount of wood flour and a pigment corresponding to the desired color tone to the forming resin material.
[0003]
Here, as the wood powder added to the forming resin material, in order to improve the dispersibility at the time of compounding with respect to the resin, there are many things that have been improved so that no wood acid gas is generated in the molding machine during resin molding, A typical example is a particle board surface polishing powder having a surface or the like cured with phenol or urea resin. The main feature of the particle board surface polishing powder is that it is fine and has a finely crushed grain shape with few cilia on the surface. And, since it is fine and has good lubricity, it is a wood powder having a good dispersion compounding property with respect to a granular resin raw material.
[0004]
In contrast, wood powder obtained by directly pulverizing wood into fine powder is poorly pulverized, whether it is obtained by a dry pulverizer or a wet pulverizer, and pulverized even if it is pulverized for a long time. There was an inconvenience that a large amount of wood flour having a large particle size remained in the flour. Also, this wood powder does not have a grain shape, many of which are fibrous as shown in FIG. 7, even if the particle diameter measured on the short diameter side is several microns, the long diameter side is long in a cilia shape, For this reason, when it mix | blends with resin and wood powder mutually entangles and it often produces an agglomerated state, it has the problem that it is not disperse | distributed uniformly with respect to resin material. Further, since the particle size of the pulverized wood powder is extremely varied, the molded resin product is liable to cause molding distortion and the like, and the mechanical strength is partially different. Therefore, as a wood powder added to the forming resin material due to such inconvenience, what is obtained by directly pulverizing wood into fine powder is said to have limitations in terms of blending, color and quality control. .
[0005]
[Problems to be solved by the invention]
However, in the resin molded product obtained by the conventional method, even if the particle board surface polishing powder is used as the added wood powder, the surface polishing powder is uniform due to the difference in the material characteristics of the particle board. It does not have characteristics, and the particle size tends to vary due to the difference in the mesh of cutting means such as sandpaper used, so that the resin molded product itself cannot have a uniform woody appearance. Therefore, it is necessary to use wood powder obtained by directly crushing wood into a fine powder and drying it.
[0006]
In addition, when the resin molding is formed into a plate shape by extrusion molding or injection molding to make a wood-like board product, naturally a pigment having a color tone that gives a wood texture is added in advance to the resin material. Are often not uniformly dispersed in the resin, and it is difficult to obtain a product with the desired color tone, and color unevenness occurs on the product surface.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems. In the wood-like plate material according to claim 1, the raw material coarsely pulverized product is subjected to a pulverization treatment and a polishing treatment, and an independent grain shape with less cilia on the peripheral surface. Make Cellulose fine particles obtained by supporting white inorganic pigment in a state of biting on the surface of cellulose fine particles The solution was made by mixing with resin and molding the mixture into a plate by extrusion or injection molding.
Further, in the woody board product according to claim 2, the raw coarsely pulverized product is subjected to pulverization treatment and polishing treatment to form an independent grain shape with less cilia on the peripheral surface. Cellulose fine particles obtained by supporting white inorganic pigment in a state of biting on the surface of cellulose fine particles Mixing with resin, forming the mixture into a plate shape by extrusion or injection molding, further subjecting the surface to be coated of the plate to a grinding treatment, and applying the paint to the grinding treatment surface It was a solution to the problem.
[0008]
[Action]
According to the woody plate material of claim 1 in the present invention, the surface is sufficiently white by the white pigment supported on the surface, and the cellulose-based fine particles supporting the pigment are ground, so that Unlike the fiber obtained by directly pulverizing the wood in the form of a fine powder, the surface thereof has less cilia and is granular, so that the surface of the plate material does not stand up and feels good.
Also, since the cellulose-based fine particles are not in the form of fibers but in the form of granules, the fibrous parts are entangled and become dumplings and cotton when the fibers are mixed and dispersed. Since they are dispersed in an independent state, the pigment-carrying fine particles themselves are extremely dispersible with respect to the forming resin, and thus the obtained plate material is of a sufficiently uniform material.
[0009]
Furthermore, since the cellulose-based fine particles are not in the form of fibers but in the form of granules, there is very little expansion and contraction caused by adsorbing or releasing water (including moisture) and solvent as in conventional fibrous wood flour. Therefore, the wood-like board material containing this is extremely excellent in dimensional stability.
Further, since the cellulose fine powder particles subjected to the grinding treatment and carrying the pigment on the surface are used as the aggregate, the adsorption / suction of the resin by the fine powder particles is extremely reduced, and molding distortion hardly occurs.
[0010]
In addition, in this wood-like board material, the cellulose-based fine particles carry an inorganic pigment, so the heat resistance is improved compared to before carrying, so that the cellulose-based fine particles such as wood powder are simply added. Compared with the case of molding, there is less thermal influence during molding, and thus alterations such as changes in color and shape are suppressed. In addition, the surface of the cellulose-based fine particles is covered by supporting the pigment, thereby suppressing the release of lignin and wood acid contained in the fine particles during molding. Molding defects due to release are prevented.
In addition, in this wood-like board material, the surface area of the cellulose-based fine particles carries the pigment, so that it is larger than the conventional wood powder. Therefore, the fine powder particles and the resin in the board material. Increases adhesion.
[0011]
According to the woody board product of claim 2, since the woody board material of claim 1 has been subjected to grinding treatment, the white inorganic pigment-supporting cellulose fine particles positioned facing the outer surface on the grinding surface, When the pigment-carrying portion is cut and the inner surface of the cellulosic fine particles faces the grinding surface, the surface of the plate material is rich in wood texture. In addition, the coating material is applied directly to the cellulose-based fine particles by applying the coating material to the ground surface where the inner surface of the cellulose-based fine particles faces, thereby improving the paste of the coating material to the plate material.
[0012]
【Example】
The present invention will be described in detail below.
In the woody plate material according to the first aspect of the present invention, a vinyl chloride resin, a phenol resin, a polyethylene resin, a polypropylene resin, an ABS resin, a polycarbonate resin, a polyurethane resin or the like is used as the forming resin material. Then, cellulose-based fine particles carrying a white inorganic pigment are blended in this forming material resin, and further known additives are blended and mixed as necessary, and then the desired plate shape is obtained by extrusion molding or injection molding. Thus, the woody plate material of the present invention can be obtained.
[0013]
Cellulose fine particles carrying white inorganic pigments can be obtained by grinding raw materials such as coarsely pulverized wood, coarsely crushed bacas, and coarsely pulverized rice straw. What is obtained is used. Here, the grinding process refers to a process having both a grinding process and a polishing process. Even if the grinding process and the polishing process are performed simultaneously, the grinding process is performed after the grinding process. It may be a two-step process. In other words, the grinding treatment referred to here is a pulverization process from a coarsely pulverized product to a finely pulverized product, as will be described later, and finely pulverized powder particles intertwined with each other, and the surface is covered with cilia. In other words, it refers to a process that combines a polishing process in which the surface is polished so that the surface has a small amount of cilia from the powder shape.
[0014]
In order to obtain a coarsely pulverized raw material, the chips and the like are pulverized by mechanical impact crushing to obtain coarsely pulverized powder having a particle size smaller than 150 mesh, preferably 120 mesh. Here, for mechanical pulverization, for example, an impeller mill (IMP-250; manufactured by Seishin Enterprise Co., Ltd.) is preferably used.
[0015]
And as such a grinding | pulverization process of a raw material material, it is preferable to carry out by the ball mill shown, for example in FIG. This ball mill is provided with a cooling jacket 2 on the peripheral wall of an air-release-type mill main body 1. Cooling water is circulated by supplying cooling water from a supply pipe 8 into the cooling jacket 2 and discharging it from a drain pipe 9. Thus, the temperature in the mill main body 1 is set to a preset temperature, for example, 80 ° C. or less.
[0016]
Here, a motor 5 is disposed at the top of the mill body 1, and a rotor 4 for agitating the balls 3 in the mill body 1 is disposed at the bottom of the motor 5. The rotor 4 is rotated by driving the motor 5 and mechanically contacts the balls 3 and the material to be ground by stirring. Further, a take-out port 7 that is opened and closed by a valve 6 is provided at the lower part of the cone body of the mill body 1 so that the material to be ground after grinding can be discharged.
[0017]
The ball 3 loaded in the mill body 1 of this ball mill is preferably a ceramic ball having an outer diameter of 3 mm to 5 mm, particularly a zirconia-based or alumina-based ceramic ball, and a metal ball such as stainless steel or steel is used. Is preferably avoided. This is because, in metal balls such as stainless steel and steel, pulverized cellulosic powder such as wood powder may be bound to the surface of the ball, or the pulverized powder may be altered due to heat generated by contact between metal balls. In addition, there is a possibility that a piece of metal ball or the like is generated and the piece is supported on the surface of the pulverized cellulose and becomes different from the desired fine particles.
The dry ball mill may be a sealed type or an open air type, but when a sealed type is employed, it is preferable to fill the mill with an inert gas such as nitrogen gas.
[0018]
Moreover, in this ball mill, the raw material material is adjusted by adjusting the surface temperature of the balls 3 to be used in the range of 90 ° C. to 120 ° C. and adjusting the room temperature of the mill body 1 not to exceed 80 ° C. In addition to the grinding treatment of the pulverized product, the drying treatment is simultaneously performed. Here, regarding the temperature control of the used ball 3, the capacity of the mill body 1, the amount of the ball 3 thrown into the mill body 1, the material and dimensions of the ball 3, and the throwing temperature and amount of the thrown crushed material, Based on the moisture content, the stirring speed and the cooling amount by the cooling jacket 2 provided on the peripheral surface of the mill body 1 are adjusted.
[0019]
In addition, although the surface temperature of the ball | bowl 3 changes also with object material, it is preferable from the point of the efficiency of grinding to set it as the range of 100 to 120 degreeC, for example in the case of wood powder. However, when grinding requires a long time, it is desirable that the temperature is 90 ° C to 100 ° C from the viewpoint of preventing explosions. If there is a risk of explosion during grinding, the oxygen concentration in the mill body 1 is preferably within 15%. In this case, for example, nitrogen gas is continuously supplied into the ball mill. A method may be adopted.
[0020]
According to the grinding process by such a ball mill, the internal temperature of the mill main body 1 rises due to frictional heat generated as the balls 3 rotate, while the temperature inside the mill main body 1 is increased by the cooling water circulated through the cooling jacket 2. And by adjusting the surface temperature of the balls 3 to the above-mentioned range, the pulverized raw material is simultaneously pulverized and dried under strong heating conditions, whereby the particle size is in a desired range, for example, 100 μm. In addition, the water content is adjusted to 2.0% by weight or less.
Further, according to this treatment, when the balls 3 are in contact with the pulverized raw material charged in the coarse powder state, the pulverized raw material in contact with the balls 3 is pulverized into a finely pulverized product, and its surface As a result of the polishing, the cilia become fine particles having a surface with very few cilia.
[0021]
That is, when the raw material pulverized product comes into contact with the surface of the ball 3, it is mechanically crushed and worn, pulverized and polished, and simultaneously heated and dried, so that the contained moisture is efficiently removed. . Further, since it is rapidly cooled when it is detached from the ball 3, the fiber in the pulverized raw material is subjected to expansion and contraction by receiving repeated heating and cooling, and is rapidly dried. The portion is efficiently ground by the balls 3, and as a result, ground cellulose-based fine particles having an independent particle shape with less cilia on the peripheral surface can be obtained.
And the cellulose type fine particle obtained in this way is classified, and it arranges to the particle size (for example, 1-10 micrometers, 10-20 micrometers, 20-50 micrometers, 50-100 micrometers) of the desired range, and carries a white inorganic pigment. Therefore, the fine cellulose particles of the present invention are used.
[0022]
Further, the grinding treatment of the raw material pulverized product can be performed using, for example, a pulverizer 30 as shown in FIG. 2 instead of the ball mill shown in FIG. This pulverizer 30 utilizes the principle of stone sculpture. Two grindstones 31 and 31 are opposed to each other with a predetermined gap therebetween, and a raw material pulverized material is put between them, and then one grindstone 31 is moved at high speed. By rotating, grinding and polishing, that is, grinding is performed.
[0023]
Here, the grindstone 31 is a dish-shaped one whose inner surface gradually inclines upward or downward as it goes to the central portion, and these are opposed to each other so that the central portion is wide and the peripheral portions are narrow. It is used. Further, as shown in FIG. 3, these grindstones 31 are donut-shaped plates having attachment holes 32 formed at the center thereof, and a plurality of feed grooves 33 are formed on the inner surface thereof. The feed groove 33 is for guiding the object to be processed in the radial direction of the grindstone 31 by a centrifugal force generated by the rotation of the grindstone 31.
[0024]
In order to perform the grinding treatment of the raw material pulverized material by such a pulverizer 30, the raw material pulverized material is put between the central portions of the two grindstones 31, 31, and then one of the grindstones 31 is rotated at a high speed. Then, the raw material pulverized material is gradually pulverized by receiving centrifugal force, impact force, shearing force, etc. between the two grindstones 31, 31. As the diameter becomes smaller, the outer periphery in the radial direction along the feed groove 33. In addition, it is crushed by impact and shearing force in the process, and its peripheral surface (surface) is polished, and as a result, it is ground and is an independent particle with less cilia on the peripheral surface. This is a ground cellulose-based fine particle having a shape.
[0025]
The cellulose-based fine particles thus obtained are classified in the same manner as in the case of the ball mill and are adjusted to have a desired particle size, so that the cellulose-based fine particles of the present invention for supporting the white inorganic pigment are used. It becomes a grain.
As the supported white inorganic pigment, titanium oxide, lithopone, white carbon, calcium carbonate and the like can be used. In particular, titanium oxide is preferable for imparting sufficient whiteness to the woody board material to be obtained. The particle diameter of the white inorganic pigment is adjusted to be sufficiently smaller than the cellulose fine particles.
[0026]
In addition, as a method for supporting the white inorganic pigment on the cellulose fine particles, when the cellulose fine particles are obtained by the ball mill shown in FIG. 1, for example, the cellulose fine particles and the white pigment are mixed and obtained. While dispersing the mixed particles in the gas phase, mechanical thermal energy mainly consisting of impact force is applied to the particles, and the cellulose fine particles are used as mother particles, and pigment particles are supported on the peripheral surface of the mother particles. Such a method is adopted. In other words, this method is based on the fact that pigment particles are harder than cellulosic fine particles. Due to such a difference in hardness, the pigment particles are sunk into the surface of cellulosic fine particles or entrapped. It can be carried in a heated state. Since the cellulose-based fine particles obtained by the ball mill are dried at the same time as the grinding treatment as described above, it is necessary to keep the dry state sufficiently until the carrying treatment. After the supporting treatment, it can be subjected to a molding treatment described later without performing a drying treatment.
[0027]
As another supporting method, particularly when the cellulose fine particles are obtained using the pulverizer 30 shown in FIG. 2, the mixed particles of the cellulose fine particles and the white pigment are as shown in FIG. It is preferable that white inorganic pigment particles are supported on the peripheral surface of the cellulosic fine particles by putting in a ball mill and subjecting to a grinding treatment again. This is because, in the grinding process by the ball mill, as described above, frictional heat is generated during the process, and as a result, the drying process is simultaneously performed. That is, the white pigment-carrying cellulose fine particles preferably have a moisture content as low as about 3% by weight or less in the molding process described later, and therefore it is desirable to perform a drying process in advance. However, when the supporting process is performed by the ball mill method, the drying process is simultaneously performed in the process, so that the obtained supporting fine particles can be directly subjected to the forming process.
[0028]
By performing such a supporting process, the white inorganic pigment particles 10... Are supported on the peripheral surface of the cellulosic fine particles 11 in a biting state as shown in FIG. The amount of the white inorganic pigment to be supported is the upper limit of the amount covering the peripheral surface of the cellulosic fine particles as the base particles and covering the peripheral surface, but the lower limit is the desired white of the wood-like board material. It is determined appropriately according to the degree.
[0029]
The pigment-supported cellulosic fine particles thus obtained have a color tone almost identical to the color tone of the white inorganic pigment, and no agglomeration is observed in the production process or storage process of the supported fine particle. It was.
The pigment-carrying cellulose-based fine particles are mixed with the forming resin material, and a desired plate shape by an extrusion or injection molding method, for example, various decorative plates such as a peripheral edge and a baseboard in a house, furniture, and a vehicle interior member By forming into a shape or the like, the woody plate material of the present invention can be obtained.
Here, although the amount of the supported fine particles with respect to the forming resin material varies depending on the type of resin and the use of the product obtained, for example, when producing a housing edge or baseboard with a vinyl chloride resin, the amount of resin is 100 parts by weight. On the other hand, about 20 to 50 parts by weight of supported fine particles are blended.
[0030]
In the wood-like board material molded in this way, the surface is sufficiently white due to the white pigment supported on the surface, and the cellulose-based fine particles supporting the pigment are ground. Therefore, unlike the case where the conventional wood directly pulverized into fine powder is fibrous, the surface thereof has less cilia and is granular, so that the surface of the plate material does not stand up and feels good.
Also, since the cellulose-based fine particles are not in the form of fibers but in the form of granules, the fibrous parts are entangled and become dumplings and cotton when the fibers are mixed and dispersed. The pigment-carrying fine particles themselves are extremely dispersible with respect to the forming resin, and thus the obtained plate material is of a sufficiently uniform material.
[0031]
Furthermore, since the cellulose-based fine particles are not in the form of fibers but in the form of granules, there is very little expansion and contraction caused by adsorbing or releasing water (including moisture) and solvent as in conventional fibrous wood flour. Therefore, the wood-like board material containing this is extremely excellent in dimensional stability.
In addition, since the cellulose fine powder particles subjected to the grinding treatment and carrying the pigment on the surface are used as the aggregate, the resin is hardly adsorbed and sucked by the fine powder particles, and molding distortion hardly occurs.
[0032]
Also, in this wood-like board material, the cellulose-based fine particles carry the pigment, so the heat resistance is improved compared to before carrying, so simply blending the cellulose-based fine particles such as wood powder and molding Compared to the case, the heat influence at the time of molding is less, and therefore, alteration such as change in color and shape is suppressed. In addition, the surface of the cellulose-based fine particles is covered by supporting the pigment, thereby suppressing the release of lignin and wood acid contained in the fine particles during molding. Molding defects due to release are prevented.
[0033]
In addition, in this wood-like board material, the surface area of the cellulose-based fine particles carries the pigment, so that it is larger than the conventional wood powder. Therefore, the fine powder particles and the resin in the board material. Increases adhesion.
Furthermore, also in molding, the cellulose-based fine particle-mixed resin of the present invention is superior in fluidity compared to conventional wood-powder-mixed resins, and therefore, the extrusion pressure and injection pressure can be set low.
[0034]
Next, the wood-like board product according to claim 2 of the present invention will be described.
This wood-like board product is basically obtained by using the wood-like board material of claim 1 as a base material, subjecting the surface to be coated of the base material to a grinding process, and applying a paint to the ground surface.
First, the paint used here will be described.
As for the paint, those used for the paint as the resin component can be used. Of these, urethane resin, acrylic resin, melamine resin, polyester resin and the like are preferably used. As the pigment, for example, a brown pigment such as iron oxide or a black pigment such as carbon is used in order to give a woody appearance.
[0035]
In particular, when it is desired to perform all matting, a paint containing the ground cellulose-based fine particles may be used. Here, when mix | blending this grinding-process cellulose-type fine particle, it is preferable to use a thing with a particle size of about 1-15 micrometers as a cellulose-type fine particle.
[0036]
Prior to applying this paint to the woody board, the following treatment is applied to the woody board as a pretreatment.
First, the surface to be coated of the wood-like plate material is ground with a brush or a baffle to make the surface to be coated rough and to remove some surface resin. Then, the wood-like plate material smoothes unnecessary irregularities generated at the time of molding and forms many fine scratches by such grinding treatment. The main purpose of this process is to eliminate surface gloss, but if a brush with uneven edges is used, the surface will be roughened and color unevenness will occur due to coloring by coating the paint as described below. As a result, the wood texture can be further enhanced, and the penetration of the paint can be improved.
[0037]
Further, in this case, the pigment-supporting cellulose fine powder particles located on the surface portion by grinding the surface are peeled off from the supported white inorganic pigment 10 as shown in FIG. Is exposed to enhance the wood texture of the board surface. In addition, unevenness of the surface whiteness is caused by such grinding treatment, and the difference in the suction of the paint and the state of the paste is also obtained microscopically when the paint is applied as described later. More wood texture is produced by the wood-like board products.
Next, decorating processing by embossing is performed on the ground surface to be coated. In this embossing process, a resin molded product is placed between the punch and the die to form a wood-like uneven pattern, or the resin molded product is rolled between embossing rolls to form a continuous grain-like uneven pattern. It is a method to do.
[0038]
Next, a paint is applied to the embossed surface to clarify the wood grain pattern, and then the excess paint on the painted surface is wiped off with a roll wound with a nonwoven fabric or the like. Here, for the application of the paint, a conventionally known application method such as a spraying method using a spray gun or various fluid immersion methods can be employed.
Furthermore, a known top coat treatment is performed on the painted surface, and cut into required dimensions as necessary to obtain the woody board product of the present invention. Of course, the cutting for obtaining the desired dimensions may be performed in advance at the stage of the wood-like plate material, that is, before the grinding treatment, and further before the embossing is performed.
[0039]
In the wood-like board product obtained in this way, since the surface of the board material was subjected to grinding treatment, the white inorganic pigment-supported cellulose fine particles positioned facing the outer surface on the grinding surface are the pigment-supported portions. The surface of the cellulosic fine particles faces the ground surface, and the feel on the surface of the plate material is soft, and the cellulosic fine particles themselves are hygroscopic and have a rich wood texture. In addition, the paint is applied directly to the cellulose-based fine particles by applying the paint to the ground surface where the inner surface of the cellulose-based fine particles faces, thereby improving the suction and paste of the paint into the plate material. . Furthermore, since the paint is sucked into the cellulosic fine particles, the paint is smeared on the plate material when viewed microscopically, and the resulting wood grain pattern is, for example, a wood grain pattern by conventional printing This eliminates the unnaturalness in which the shade of the color becomes clear at the border of the pattern, making it closer to the natural one.
[0040]
In addition, if a mixture containing finely divided cellulose-based finely divided particles is used as a paint, it has a color tone unique to the pigment used in the paint, without causing a decrease in white turbidity, unlike a conventional matte surface such as silica. A matte colored surface is obtained. That is, such a good matte surface is obtained because, as shown in FIG. 6, the cellulose fine particles 22 are uniformly arranged in the coating film 21 on the surface of the plate member 20, and after the coating film is formed, the coating film is formed. This is because although the cellulosic fine particles 22 do not shrink in the surface layer, the resin content between them slightly shrinks, so that extremely minute irregularities are formed on the surface, thereby suppressing the depth reflection and making the entire matte.
[0041]
Furthermore, in this wood-like board product, cellulose-based fine particles are blended in the wood-like board material, and the inorganic pigment carried by this is fine particles, so there is no problem in processing. Can be handled in much the same way as wood, so when it is used as a decorative material for a house or the like, installation such as on-site installation becomes extremely easy.
Further, since cellulose-based fine particles are blended in the wood-like board material, the application of the paint to the board material becomes strong, and the product has a sufficiently uniform coating film without partial peeling.
In addition, when a paint containing cellulose-based fine particles with good dispersibility is used as a paint, the dispersion of the brown pigment imparting a woody color tone in the paint also improves, and the resulting painted surface has an unnatural color. There will be no unevenness, and it will have a woody appearance that has only a natural color change due to embossing or the like.
[0042]
(Production example)
Wood powder having a particle size of 30 μm to 100 μm and an average particle size of 50 μm obtained by grinding by the ball mill method was prepared, and titanium oxide having an average particle size of 5 μm was supported thereon as a white inorganic pigment.
Moreover, it grind | pulverized with the grinder 30 shown in FIG. 2, and obtained a wood powder with a particle size of 30 micrometers-100 micrometers and an average particle diameter of 50 micrometers, and carry | supported the titanium oxide with an average particle diameter of 5 micrometers as this white inorganic pigment .
As a loading method, all the wood flours were subjected to the above-described regrinding method using a ball mill.
[0043]
Next, 30 parts by weight of each of the two types of supported fine particles obtained are blended with respect to 100 parts by weight of the vinyl chloride resin, and further known additives are blended and mixed. Was used to obtain two types of plate materials having a width of 60 mm, a thickness of 7 mm, and a length of 10 m.
When the obtained board | plate material was observed visually and also the touch feeling was investigated, both had uniform whiteness, and it was confirmed that the surface is soft and there is no stickiness.
[0044]
Further, the one surface of each of the plate members and the side end surface in the length direction were subjected to a grinding process with a baffle to make the treated surface rough.
Next, the ground surface was further embossed with a punch and a die to form a grainy uneven pattern.
[0045]
A general paint prepared in advance was applied to the embossed surface of the plate material with a spray gun to clarify the wood grain pattern, and then the excess paint on the painted surface was wiped off with a roll wound with a nonwoven fabric or the like.
Further, a urethane or acrylic paint was applied to the painted surface with a spray gun, a flow coater or the like, and a top coat treatment was performed.
Each of the obtained baseboards had a clear grain pattern, moderate color unevenness, and had a surface layer very close to natural wood because it was matted. In addition, the touch was soft and the surface was not sticky, so the wood texture was sufficient.
[0046]
【The invention's effect】
As described above, the wood-like board material according to claim 1 of the present invention has a cellulose-based fine particle carrying a pigment. Crushed and polished Therefore, unlike the conventional pulverized timber directly pulverized into fibers, the surface of the timber has less cilia and has a granular shape. It will be a good touch.
In addition, since the cellulosic fine particles are not in the form of fibers but are in a granular form, the pigment-carrying fine particles themselves are extremely dispersible with respect to the forming resin by being dispersed in an independent state, and thus can be obtained. The plate material is sufficiently uniform.
[0047]
In addition, conventional Grinding and polishing When fibrous wood powder (cellulosic fine particles) that is not subjected to the treatment is blended into the resin as an aggregate, the wood is yellowed due to the effect of a treatment agent for alkali neutralization treatment, and further brown However, in the present invention, the discoloration is angry because the cellulose-based fine particles that simply carry the white inorganic pigment and do not perform the alkali treatment are used in the present invention. Moreover, since the cellulose-based fine particles are not in the form of fibers but are in a granular form, the expansion and contraction is extremely small. Therefore, the wood-like board material containing this has excellent dimensional stability.
[0048]
Also, Grinding and polishing Since the cellulose fine particles having a pigment applied to the surface thereof are used as the aggregate, the adsorption and suction of the resin by the fine particles are extremely reduced, and molding distortion hardly occurs.
Also, in this wood-like board material, the cellulose-based fine particles carry the pigment, so the heat resistance is improved compared to before carrying, so simply blending the cellulose-like powder such as wood powder and molding Compared to the case, the heat influence at the time of molding is small, so that alteration such as change in color and shape is suppressed. In addition, the surface of the cellulose-based fine particles is covered by supporting the pigment, thereby suppressing the release of lignin and wood acid contained in the fine particles during molding. Molding defects due to release are prevented.
[0049]
In addition, in this wood-like board material, the surface area of the cellulose-based fine particles carries the pigment, so that it is larger than the conventional wood powder. Therefore, the fine powder particles and the resin in the board material. Increases adhesion.
Furthermore, since it becomes a white board | plate material by mix | blending the cellulosic fine particle which carry | supported the white inorganic pigment, the color adjustment in a secondary process becomes simple and it becomes possible to provide beautiful woody appearance easily.
[0050]
The woody board product according to claim 2 is obtained by subjecting the woody board material according to claim 1 to a grinding process, so that the white inorganic pigment-supporting cellulose fine particles positioned facing the outer surface on the ground surface are the pigments. When the support portion is cut and the inner surface of the cellulosic fine powder faces the ground surface, the surface of the plate material is rich in wood texture. In addition, the paint is applied to the ground surface where the inner surface of the cellulosic fine particles faced, so that the paint is directly sucked into the cellulosic fine particles, which improves the paste of the paint on the plate material. It will be rich in wood texture. Furthermore, since the paint is sucked into the cellulosic fine particles, the paint is smeared on the plate material when viewed microscopically, and the resulting wood grain pattern is, for example, a wood grain pattern by conventional printing This eliminates the unnaturalness in which the shade of the color becomes clear at the border of the pattern, making it closer to the natural one.
In addition, the wood-like board material contains cellulose-based fine particles, so cutting and nailing with a saw can be performed sufficiently, so that it can be handled in the same way as wood. It is also extremely excellent in workability such as installation on site.
[Brief description of the drawings]
FIG. 1 is a fragmentary front view of an open type ball mill.
FIG. 2 is a schematic configuration diagram showing an example of a pulverizer used for grinding treatment.
FIG. 3 is a plan view showing an example of a grindstone of the pulverizer shown in FIG. 2;
FIG. 4 is a cross-sectional view showing a state in which a white inorganic pigment of cellulose-based fine particles used in the present invention is supported.
FIG. 5 is an enlarged view of a surface portion of a plate material that has been subjected to grinding treatment.
FIG. 6 is an enlarged view of a surface layer portion of a plate material showing a state in which a paint containing cellulose-based fine particles is applied to the cutting surface of the plate material.
FIG. 7 is an enlarged view showing a conventional wood powder obtained by directly pulverizing wood into fine powder.
[Explanation of symbols]
1 Mill body
3 balls
10 White inorganic pigment particles
11 Cellulose-based fine particles
20 Plate material
21 Coating
22 Cellulose fine particles
30 Crusher

Claims (2)

Cellulose obtained by subjecting the coarsely pulverized raw material to pulverization and polishing treatment, and supporting the white inorganic pigment in a state of biting on the surface of the cellulose fine particles having an independent particle shape with little cilia on the peripheral surface A wood-like board material obtained by mixing system fine particles with a resin, and molding the mixture into a plate shape by extrusion or injection molding. Cellulose obtained by subjecting the coarsely pulverized raw material to pulverization and polishing treatment, and supporting the white inorganic pigment in a state of biting on the surface of the cellulose fine particles having an independent particle shape with little cilia on the peripheral surface The system fine particles are mixed with a resin, the mixture is formed into a plate shape by extrusion or injection molding, the surface to be coated of the plate-shaped body is ground, and the paint is applied to the ground surface. A wood-like board product characterized by

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