JP2009034951A - Method for manufacturing wood-like molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a wood-like molded article which excellently harmonizes with a resin, and lowers water absorption to prevent the dimensional change, deformation, crack, etc., over a long period of time. <P>SOLUTION: The pulverized powder of the woody waste material obtained by pulverizing woody waste materials is subjected to an acetylation treatment to form acetylated wood powder, and the waste material-mixed resin prepared by mixing a thermoplastic resin and a thermosetting resin, and impurities obtained from resin waste materials is subjected to coarse pulverization to ≤20 mm to obtain the coarse pulverized matter of the waste material-mixed resin. Thereafter, the coarse pulverized matter of the waste material-mixed resin, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and molded, and thereby a first wood powder-containing compound is manufactured. Then, the wood-like molded article is manufactured by melting the first wood powder-containing compound, and molding the melt. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wood-like molded article comprising a waste material mixed resin obtained by mixing thermoplastic resin, thermosetting resin and impurities obtained from resin waste material, and wood waste material pulverized powder obtained by pulverizing wood waste material It relates to the manufacturing method.

Conventionally, pulverized powder obtained by pulverizing cellulose material and resin etc. are mixed and molded into a desired shape by extrusion molding or injection molding. It was done to form. And although the cellulose material mentioned above used the end material and sawdust of the wooden member for construction, as a construction member from the viewpoint of effective use of resources and environmental protection, collect the once used building panel, etc. It has been desired to grind the collected building members and use them again as raw materials.
As an example of a method for producing a wood-like molded product using pulverized powder obtained from a building member such as a collected building panel as a raw material, for example, a wooden material is recovered from the building member, and a recovery made of resin. The resin member is recovered, a mixing step of mixing the recovered wooden member and the recovered resin member, a pulverizing step of pulverizing the mixture in the mixing step to form a pulverized powder, and a pulverization obtained by the pulverizing step A technique including a kneading step for kneading powder and a molding step for extruding or injection molding the kneaded material in this kneading step is known (for example, see Patent Document 1).
JP 11-129223 A

However, the wood-like molded product produced by the technique described in Patent Document 1 has deformations and cracks caused by dimensional changes over a long period due to water absorption (moisture absorption) and uneven water absorption conditions. Therefore, the present situation is that it is designed and constructed as an inevitable characteristic as long as wood powder is used.
The present invention has been made in view of the above circumstances, and has a good familiarity with the resin and can reduce the water absorption rate to prevent dimensional change, deformation, cracking, etc. over a long period of time. It aims at providing the manufacturing method of goods.

In order to solve the above-mentioned problem, the invention of claim 1 is, for example, as shown in FIG. 1, a waste material mixed resin obtained from a resin waste material, in which a thermoplastic resin, a thermosetting resin, and impurities are mixed, and A method for producing a wood-like molded product comprising a wood waste material pulverized powder obtained by grinding wood waste material,
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
The waste material mixed resin coarsely pulverized product, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and molded to produce a first wood powder-containing compound,
The first wood powder-containing compound is melted and formed into a required shape.

According to the invention of claim 1, by performing an acetylation treatment on the wood waste material pulverized powder, the hydroxyl group at the terminal of the cellulose that is the raw material of the wood powder is converted into an acetyl group, that is, a hydrophilic group is converted into a hydrophobic group. Can inhibit the adsorption of water. Then, such acetylated wood flour, waste material mixed resin coarsely pulverized product, and thermoplastic resin are kneaded and molded to produce a first wood flour-containing compound, and the first wood flour-containing compound is melted. Since it is molded into a required shape, it is possible to produce a wood-like molded product having a low water absorption rate. As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. In addition, since the adsorption of water can be inhibited by the acetylation treatment with the wood waste material pulverized powder, the familiarity between the wood powder and the resin is improved, and the strength can be improved.
In addition, a hard-melting waste material mixed resin mixed with thermosetting resin or impurities is roughly pulverized to 20 mm or less to be a waste material mixed resin coarsely pulverized product, and then pulverized thermoplastic resin and acetylated A first wood powder-containing compound is produced by kneading and molding wood powder. The first wood powder-containing compound is made of a waste material mixed resin coarsely pulverized product, a thermoplastic resin, and an acetylated wood powder. In this case, it is sufficiently dehydrated to reduce the specific gravity, resulting in a uniformly mixed molded product. By melting such a first wood powder-containing compound and molding it into a required shape, a wood-like molded product can be easily obtained.
In other words, when trying to directly mold waste material mixed resin coarsely pulverized product, thermoplastic resin, and acetylated wood powder, these cannot be separated and mixed uniformly in the hopper of the molding machine due to the difference in specific gravity. Since the dispersion of the dust causes a change in the content, it becomes impossible to mold, but in the present invention, the first wood powder-containing compound is manufactured, and this is melted and molded into a required shape. A wood-like molded product can be obtained.
In this way, it is possible to easily produce a wood-like molded product from a thermoplastic resin that is easy to melt, a thermosetting resin that is difficult to melt, a waste material mixed resin in which impurities are mixed, and a wood waste material. The mixed resin and the wood waste material can be reused, and the reuse rate of the waste material can be improved.

  In addition, when the first wood powder-containing compound is produced, for example, compared to a pellet produced by melting a material made of resin, pigment, wood powder, and extruding into a string shape from a porous circular nozzle and cutting it. Less time and energy is required for melting.

As a waste material mixed resin containing a thermoplastic resin, a thermosetting resin, and impurities, for example, plastic waste by the container packaging recycling method is used. Plastic waste includes acrylic resin containing aluminum hydroxide such as plastic bottles and artificial marble, reinforced plastic (FRP) reinforced with glass fiber, nylon, and paper, cloth, and aluminum foil in the above resin. And so on.
As a thermosetting resin, a phenol resin, a melamine resin, a urethane resin, a polyurethane resin etc. are mentioned, for example.
The thermoplastic resin is, for example, a resin obtained from a container, packaging, tray, or the like of a food containing beverages, and includes polypropylene resin (PP), polyvinyl chloride resin (PVC), polyethylene resin (PE), foamed chloride. A vinyl resin, a polystyrene resin, etc. are mentioned.
Examples of wood waste include wood waste discharged when dismantling buildings such as houses, wood waste discharged when dismantling furniture, wood scraps discharged during building construction, sawdust, etc. It is done.

The invention of claim 2 is, for example, as shown in FIG. 2, obtained by pulverizing a waste material mixed resin obtained from a resin waste material, in which a thermoplastic resin, a thermosetting resin, and impurities are mixed, and a wood waste material. A method for producing a wood-like molded product comprising the obtained wood waste material pulverized powder,
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
This waste material mixed resin coarsely pulverized product is fused and solidified to obtain a waste material mixed resin solidified product,
This waste material mixed resin solidified material is pulverized into a pulverized solidified powder,
The solidified product pulverized powder, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and molded to produce a second wood powder-containing compound,
The second wood powder-containing compound is melted and formed into a required shape.

According to the invention of claim 2, by performing an acetylation treatment on the wood waste material pulverized powder, the hydroxyl group at the terminal of the cellulose used as the raw material of the wood powder is converted into an acetyl group, that is, the hydrophilic group is changed to the hydrophobic group. Can inhibit the adsorption of water. Then, such acetylated wood powder, solidified pulverized powder, and thermoplastic resin are kneaded and molded to produce a second wood powder-containing compound, and the second wood powder-containing compound is melted to obtain a desired Since it is molded into a shape, a wood-like molded product having a low water absorption rate can be produced. As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. In addition, since the adsorption of water can be inhibited by the acetylation treatment with the wood waste material pulverized powder, the familiarity between the wood powder and the resin is improved, and the strength can be improved.
In addition, a hard-melt waste material mixed resin mixed with a thermosetting resin or impurities is roughly pulverized to 20 mm or less, then fused and solidified, and further pulverized to obtain a solidified powder. The second wood powder-containing compound is produced by kneading and molding the pulverized thermoplastic resin and the acetylated wood powder. The second wood powder-containing compound comprises a waste material mixed resin coarsely pulverized product, a thermoplastic resin, Each of the acetylated wood flours is sufficiently dehydrated during kneading to reduce the specific gravity, thereby forming a uniformly mixed molded product. A wood-like molded product can be easily obtained by melting and molding the second wood powder-containing compound into a required shape.
In other words, when trying to directly mold waste material mixed resin coarsely pulverized product, thermoplastic resin, and acetylated wood powder, these cannot be separated and mixed uniformly in the hopper of the molding machine due to the difference in specific gravity. Since the dispersion of the dust causes a change in the content, it becomes impossible to mold, but in the present invention, the second wood powder-containing compound is manufactured, and this is melted and molded into a required shape. A wood-like molded product can be obtained.
In this way, it is possible to easily produce a wood-like molded product from a thermoplastic resin that is easy to melt, a thermosetting resin that is difficult to melt, a waste material mixed resin in which impurities are mixed, and a wood waste material. The mixed resin and the wood waste material can be reused, and the reuse rate of the waste material can be improved.
The waste material mixed resin is coarsely pulverized to 20 mm or less, then fused and solidified, further pulverized into a solidified pulverized powder, and then kneaded and molded to produce a second wood powder-containing compound. Therefore, as compared with the first aspect, the thermosetting resin, impurities, and thermoplastic resin can be more uniformly mixed without being separated, and the moldability is improved.

The invention of claim 3 is a waste material mixed resin obtained from resin waste material, in which a thermoplastic resin, a thermosetting resin and impurities are mixed, and a wood waste material pulverized powder obtained by pulverizing the wood waste material. A method for producing a wood-like molded product including
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
The waste material mixed resin coarsely pulverized product, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and molded to produce a first wood powder-containing compound,
Meanwhile, the waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
This waste material mixed resin coarsely pulverized product is fused and solidified to obtain a waste material mixed resin solidified product,
This waste material mixed resin solidified material is pulverized into a pulverized solidified powder,
The solidified product pulverized powder, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and molded to produce a second wood powder-containing compound,
The first wood powder-containing compound and the second wood powder-containing compound are mixed and melted to form a desired shape.

According to the invention of claim 3, by subjecting the wood waste material pulverized powder to an acetylation treatment, the hydroxyl group at the terminal of the cellulose that is the raw material of the wood powder is converted to an acetyl group, that is, the hydrophilic group is changed to the hydrophobic group. Can inhibit the adsorption of water. And using such acetylated wood flour, the 1st wood flour containing compound and the 2nd wood flour containing compound are manufactured, and the 1st wood flour containing compound and the 2nd wood flour containing compound are mixed and melted. Therefore, a wood-like molded product having a low water absorption rate can be produced. As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. In addition, since the adsorption of water can be inhibited by the acetylation treatment with the wood waste material pulverized powder, the familiarity between the wood powder and the resin is improved, and the strength can be improved.
In addition, the first wood powder-containing compound and the second compound are produced, respectively, and these first wood powder-containing compound and second wood powder-containing compound are a waste material mixed resin coarsely pulverized product, a thermoplastic resin, and an acetylated wood powder. Each of these is sufficiently dehydrated during kneading to reduce the specific gravity, resulting in a uniformly mixed molded product. By mixing and melting such a first wood powder-containing compound and a second wood powder-containing compound and molding them into a required shape, a wood-like molded product can be easily obtained.
In other words, when trying to directly mold waste material mixed resin coarsely pulverized product, thermoplastic resin, and acetylated wood powder, these cannot be separated and mixed uniformly in the hopper of the molding machine due to the difference in specific gravity. Since the dispersion of the dust causes a change in the content, it becomes impossible to mold, but in the present invention, the first wood powder-containing compound and the second wood powder-containing compound are manufactured, mixed and melted. Therefore, a wood-like molded product can be easily obtained.
In this way, it is possible to easily produce a wood-like molded product from a thermoplastic resin that is easy to melt, a thermosetting resin that is difficult to melt, a waste material mixed resin in which impurities are mixed, and a wood waste material. The mixed resin and the wood waste material can be reused, and the reuse rate of the waste material can be improved.

The invention of claim 4 is, for example, as shown in FIG. 3, by pulverizing a waste material mixed resin obtained from a resin waste material, in which a thermoplastic resin, a thermosetting resin, and impurities are mixed, and a wood waste material. A method for producing a wood-like molded product comprising the obtained wood waste material pulverized powder,
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is pulverized to 1 mm or less to obtain a waste material mixed resin pulverized product,
The waste material mixed resin pulverized product, the pulverized thermoplastic resin, and the acetylated wood flour are kneaded and melted to form a desired shape.

According to the invention of claim 4, by subjecting the wood waste material pulverized powder to an acetylation treatment, the hydroxyl group at the end of cellulose which is the raw material of the wood powder is converted into an acetyl group, that is, a hydrophilic group is changed to a hydrophobic group. Can inhibit the adsorption of water. And since such acetylated wood flour, waste resin mixed resin pulverized product, and thermoplastic resin are kneaded and melted and molded into a desired shape, a wood-like molded product with low water absorption can be produced. . As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. In addition, since the adsorption of water can be inhibited by the acetylation treatment with the wood waste material pulverized powder, the familiarity between the wood powder and the resin is improved, and the strength can be improved.
In addition, since the waste material mixed resin is pulverized to 1 mm or less and then kneaded and melted with the pulverized thermoplastic resin and the acetylated wood flour, it is molded into a required shape. The waste material mixed resin is more finely pulverized, and the pulverized waste material mixed resin pulverized product, the thermoplastic resin, and the acetylated wood powder are more evenly mixed.
Therefore, for example, in the case of extrusion molding with a hollow shape, a wood-like molded product is easily produced from these waste material mixed resin and wood waste material pulverized powder without causing problems such as those that did not melt caught on the core can do.

The invention of claim 5 is, for example, as shown in FIG. 4, by pulverizing a waste material mixed resin obtained from a resin waste material, in which a thermoplastic resin, a thermosetting resin, and impurities are mixed, and a wood waste material. A method for producing a wood-like molded product comprising the obtained wood waste material pulverized powder,
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
This waste material mixed resin coarsely pulverized product is fused and solidified to obtain a waste material mixed resin solidified product,
This waste material mixed resin solidified product is pulverized to 1 mm or less to obtain a solidified product pulverized powder,
The solidified product pulverized powder, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and melted to form a desired shape.

According to the invention of claim 5, by subjecting the wood waste material pulverized powder to an acetylation treatment, the terminal hydroxyl group of cellulose used as the raw material of the wood powder is converted into an acetyl group, that is, a hydrophilic group is changed to a hydrophobic group. Can inhibit the adsorption of water. And since such acetylated wood powder, solidified pulverized powder, and thermoplastic resin are kneaded and melted and formed into a desired shape, a wood-like molded product with low water absorption can be produced. As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. In addition, since the adsorption of water can be inhibited by the acetylation treatment with the wood waste material pulverized powder, the familiarity between the wood powder and the resin is improved, and the strength can be improved.
In addition, since the waste material mixed resin solidified product is pulverized to 1 mm or less and then kneaded and melted with the pulverized thermoplastic resin and acetylated wood flour, it is molded into a required shape. The waste material mixed resin is more finely pulverized, and the pulverized waste material mixed resin pulverized product, the thermoplastic resin, and the acetylated wood powder are more evenly mixed.
Therefore, for example, in the case of extrusion molding with a hollow shape, a wood-like molded product is easily produced from these waste material mixed resin and wood waste material pulverized powder without causing problems such as those that did not melt caught on the core can do.
Further, the waste material mixed resin solidified product is obtained by roughly crushing the waste material mixed resin to 20 mm or less and then fusing and solidifying it, so that the thermosetting resin, impurities, and thermoplasticity are compared with the fourth aspect. The resin can be uniformly mixed without being separated, and the moldability is improved.

Invention of Claim 6 in the manufacturing method of the wood-like molded article in any one of Claims 1-5,
For the whole molded product,
The waste material mixed resin is contained in an amount of 5 to 20 wt%, the thermoplastic resin is contained in an amount of 25 to 40 wt%, and the acetylated wood flour is contained in an amount of 10 to 55 wt%.

  According to the invention of claim 6, the acetylated wood powder can contain a large amount of acetylated wood powder in the wood-like molded product by containing 10 to 55 wt% of the entire molded product. The rate can be reduced, and dimensional change, deformation, cracking, etc. can be prevented. In addition, the strength can be improved and a feel and texture closer to that of real wood can be obtained. Further, by including 5 to 20 wt% of the waste material mixed resin and 25 to 40 wt% of the thermoplastic resin, the amount of the waste material to be used is increased, and the reuse rate of the waste material can be improved.

Here, when 10 to 55 wt% of the acetylated wood flour is contained in the entire molded product, the water absorption becomes high if it is less than 10 wt%, dimensional change, deformation, cracking, etc. are likely to occur, and the strength can be improved. This is because there is not. In addition, it is difficult to create a texture that is closer to that of real wood. On the other hand, if it exceeds 55 wt%, the amount of acetylated wood powder becomes excessive and the moldability of the wood-like molded product is lowered.
Further, the amount of the waste material mixed resin included in the molded product is 5 to 20 wt%. If the content is less than 5 wt%, it is difficult to improve the recycling rate of the waste material. This is because the moldability of the wood-like molded product is reduced because it contains a large amount of curable resin.
Furthermore, the thermoplastic resin is contained in an amount of 25 to 40 wt% with respect to the entire molded product. If the amount is less than 25 wt%, it is difficult to knead and mold with the waste material mixed resin that is difficult to melt because the thermoplastic resin is too small. This is because if it exceeds 50%, a large amount of thermoplastic resin is contained, so that a wood-like molded product with a wood texture cannot be obtained.

  According to the present invention, the water absorption is low, dimensional change, deformation, cracking, and the like over a long period can be prevented, and the strength can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The wood-like molded article produced by the present invention is obtained from a resin waste material, and a wood material obtained by crushing a waste material mixed resin obtained by mixing a thermoplastic resin, a thermosetting resin, and impurities, and a wood waste material. And acetylated wood powder obtained by acetylating the waste material ground powder with acetic anhydride. Hereinafter, the first to fifth embodiments of the method for manufacturing a wood-like molded product will be described.

  As shown in FIG. 1, in the first embodiment, first, in the pulverization step, the wood waste material is pulverized to form the wood waste material pulverized powder. This pulverization step is formed from three stages of primary pulverization, secondary pulverization, and tertiary pulverization. Of course, this pulverization form is divided into each stage for efficient execution, and is not particularly limited to this, and it is possible to carry out in one kind of pulverization process.

  The crushing device used in the primary crushing step has a crushing function that can make a large lump having a lump size of several centimeters. Specifically, This is a pulverizer that forms a large number of protrusions on the surfaces of the opposing rollers, and rotates the rollers while pressurizing the rollers to crush what passes between them. Of course, the crusher is not limited to this, and other coarse crushers may be used as long as they have the same function. For example, a jaw crusher that crushes the raw material by putting the raw material between the jaw that opens upward in the V shape and the vibrating jaw and pressurizes it, or a gai that the movable crushing surface swirls in the fixed crushing surface and continuously crushes Other coarse crushing devices such as a rent crusher may be used.

  Next, in the secondary pulverization step, the primary pulverized material that has finished the primary pulverization step is pulverized into a fine powder. The crushing device used in this secondary crushing process is capable of crushing a large lump up to a few millimeters or less into a fine powder, and specifically, a material with a hammer tip that rotates at high speed. A hammer mill that repeats the crushing action until it passes through the round hole of the screen on the outer periphery of the hammer tip is used. Of course, the crushing device to be used is not limited to the above-described hammer mill, and other crushing devices may be used as long as they have the same function. For example, a cutter mill that is chopped by a cutter, a roll mill that is crushed by a roller, or the like may be used.

Next, in the tertiary pulverization step, the secondary pulverized material after the secondary pulverization step is pulverized into a fine powder. The pulverizer used in the tertiary pulverization step can pulverize the material obtained in the secondary pulverization step into a finer powder. Specifically, it is a so-called pin mill, which can be pulverized by receiving impact and repulsion interaction with a pin attached to a disk. More specifically, the pin mill includes a disk-shaped rotating disk having a large number of pins in the vertical direction and a fixed disk having a large number of pins on a surface facing the rotating disk, and is obtained by a secondary grinding process. When the material is put into the center of the rotating disk, it can enter into the gap between the rotating disk and the pin attached to the fixed disk by centrifugal force, and can be crushed into fine powder under the impact and repulsive interaction of the pin It is. In this tertiary pulverization step, the particles are pulverized into particles having a size of about 60 micrometers by the pin mill described above. Of course, the crushing device is not limited to the above-described pin mill, and may be another fine crushing device having the same function, for example, a ball mill or a stone mill.
In the pulverization process as described above, the recovered wooden waste material is divided into three stages, and the pulverization is efficiently performed in stages.

  Next, acetylation treatment with acetic anhydride is performed on the tertiary pulverized material after the tertiary pulverization step to obtain acetylated wood flour. Specifically, in an open container, the tertiary pulverized material is immersed in acetic anhydride at 120 ° C. for 24 hours, taken out, washed with water and dried. The acetylated wood flour thus obtained is pressurized while the terminal hydroxyl group of wood flour (cellulose) is converted to acetyl groups, that is, from hydrophilic groups to hydrophobic groups, and water adsorption is inhibited. If the container is immersed in acetic anhydride, the temperature can be lowered and the treatment time can be shortened.

Next, the waste material mixed resin obtained from the resin waste material and made by mixing the thermoplastic resin, the thermosetting resin, and the impurities is pulverized.
As the resin waste material, for example, plastic waste obtained by the container packaging recycling method is used. Plastic waste includes acrylic resin containing aluminum hydroxide such as plastic bottles and artificial marble, reinforced plastic (FRP) reinforced with glass fiber, nylon, and paper, cloth, and aluminum foil in the above resin. And so on.
The thermoplastic resin is obtained by, for example, pulverizing a polypropylene packaging member such as a tray, a food container or the like collected after being used for packaging of food or the like, or a polypropylene end material that is produced when the polypropylene packaging member is formed. . The composition of the polypropylene packaging member is mainly 75% polypropylene, 20% talc, and 5% calcium carbonate. Here, calcium carbonate prevents expansion and contraction due to temperature change of the polypropylene packaging member and stabilizes the shape. Has been added for.
Then, a waste material mixed resin obtained by mixing the thermoplastic resin, the thermosetting resin, and the impurities obtained from the resin waste material is roughly pulverized to, for example, 20 mm or less using a hammer mill to obtain a waste material mixed resin coarsely pulverized product. obtain.
The polypropylene packaging member as described above is pulverized using, for example, a hammer mill to obtain a pulverized powder of thermoplastic resin.

Next, in the kneading step, the acetylated wood powder of the wood waste material obtained by the acetylation treatment, the waste material mixed resin coarsely pulverized product pulverized to 20 mm or less, and the pulverized thermoplastic resin are uniformly distributed. To produce a first wood flour-containing compound.
Here, with respect to the entire molded product, the blending amount is adjusted so that the waste material mixed resin is contained in 5 to 20 wt%, the thermoplastic resin is contained in 25 to 40 wt%, and the acetylated wood flour is contained in 10 to 55 wt%. .

Next, in the molding process, the first wood powder-containing compound is molded into a required shape by an extrusion molding machine or an injection molding machine while applying a predetermined temperature and pressure.
In this molding step, the molding temperature is set to 160 to 220 ° C., and molding is performed at this molding temperature. Here, the molding temperature in the molding process was set to 160 to 220 ° C., and if it is less than 160 ° C., the softening of the waste material mixed resin coarsely pulverized product and the thermoplastic resin is insufficient, and it is difficult to uniformly knead with the acetylated wood flour. Further, at 220 ° C. or higher, the acetylated wood flour causes changes such as carbonization due to heat.
Since the molding temperature was set to 160 to 220 ° C. in this way, the acetylated wood flour was not changed by heat in the molding process, and the waste material mixed resin coarsely pulverized product and the thermoplastic resin were sufficiently melted and softened, It can be kneaded evenly with acetylated wood flour, whereby a wood-like molded product can be obtained easily and reliably.

In addition, since the surface treatment is normally given to the said wood-like molded article, an example of this surface treatment is demonstrated below.
First, in the embossing process, using an embossing device equipped with a rotating shaft and a cylindrical embossing roller that can rotate around the axis of the rotating shaft, the embossing is performed while pressing the wood-like molded product from above. A number of grooves are formed on the surface of the wood-like molded product by rotating the roller.
In the hairline processing step, many scratches are formed on the surface of the wood-like molded product by sanding paper.
Next, in the coloring step, a colored paint is applied or a wiping stain treatment is performed. The wiping stain treatment is a treatment in which a paint is applied to the surface of a wood-like molded article, and then wiped off before drying to color only the grooves formed by the embossing.

After the completion of the coloring process, the drying process is started, and the surface of the wood-like molded product on which the colored paint is applied is dried. And in a grinding | polishing process, grinding | polishing processing is given to the surface of the wood-like molded article to which the coloring processing process was given.
That is, it grind | polishes using a grinding | polishing apparatus, extruding a wooden-like molded product along rotation of the grinding | polishing roller of a grinding | polishing apparatus.
Furthermore, after the polishing process is completed, the process proceeds to the painting process. This coating process is divided into an intermediate coating operation process and an overcoating operation process. In the intermediate coating operation process, a color sanding sealer is applied to the entire surface of the wood-like molded product. If necessary, UV coating may be applied before and after intermediate coating. Then, in the top coating process, a top coat is applied to the surface of the wood-like molded product, and a UV coat is applied to cure the top coat from the top coat.

According to the first embodiment of the present invention, by performing an acetylation treatment on the wood waste material pulverized powder, the hydroxyl group at the end of cellulose, which is the raw material of the wood powder, is converted to an acetyl group, thereby inhibiting the adsorption of water. can do. Then, such acetylated wood flour, waste material mixed resin coarsely pulverized product, and thermoplastic resin are kneaded and molded to produce a first wood flour-containing compound, and the first wood flour-containing compound is melted. Since it is molded into a required shape, it is possible to produce a wood-like molded product having a low water absorption rate. As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. In addition, since the adsorption of water can be inhibited by the acetylation treatment with the wood waste material pulverized powder, the familiarity between the wood powder and the resin is improved, and the strength can be improved.
In addition, after roughly pulverizing the waste material mixed resin to 20 mm or less, the pulverized thermoplastic resin and the acetylated wood powder are kneaded and molded to produce the first wood powder-containing compound, and molded into the required shape. Each of the waste material mixed resin coarsely pulverized product, thermoplastic resin, and acetylated wood powder becomes a uniformly mixed molded product, and it is easy by melting and molding such a first wood powder-containing compound into a required shape. A wood-like molded product can be obtained.
Moreover, since it becomes possible to contain 10-55 wt% of acetylated wood flour in the wood-like molded product, it is possible to give a feel and texture closer to real wood, and the waste material mixed resin is 5-20 wt%, thermoplastic. By including 25 to 40 wt% of the resin, the amount of waste material to be used increases and the reuse rate of the waste material can be improved.
In addition, food packaging members containing polypropylene used to obtain a thermoplastic resin are often collected together with the same composition, so the properties and the like are easy to understand and easy to reuse.
In addition, after the molding process, the wood-like molded product has been surface treated, so that the resin on the surface is scraped off, the acetylated wood powder is exposed on the surface, and the touch can be made closer to real wood. Visually, you can get close to real wood.

Next, second to fifth embodiments will be described.
In the second to fifth embodiments, differences from the first embodiment will be mainly described, and the description of the same parts will be omitted.
As shown in FIG. 2, in the second embodiment, first, the wood waste material is pulverized by the above-described pulverization step to obtain a wood waste material pulverized powder. Then, the wood waste material pulverized powder after the tertiary pulverization step is immersed in acetic anhydride at 120 ° C. for 24 hours in the same manner as in the first embodiment, taken out, washed with water and dried to perform acetylation treatment. . On the other hand, the resin waste material is roughly pulverized to 20 mm or less using a hammer mill or the like to obtain a waste material mixed resin coarsely pulverized product, and this waste material mixed resin coarsely pulverized product is melted by self-heating under high pressure using an extruder. It is made to solidify and is made into a waste material mixed resin solidified product. Furthermore, this waste material mixed resin solidified product is pulverized to obtain a solidified product pulverized powder.
Next, the solidified material pulverized powder, the pulverized thermoplastic resin, and the wood waste material pulverized powder are kneaded and molded in a kneading step to produce a second wood powder-containing compound. Thereafter, the second wood powder-containing compound is melted in a molding step and molded into a required shape by an extrusion molding machine or an injection molding machine.

According to the second embodiment of the present invention, the acetylation treatment is performed on the wood waste material pulverized powder, so that the adsorption of water can be inhibited. Then, such acetylated wood powder, solidified pulverized powder, and thermoplastic resin are kneaded and molded to produce a second wood powder-containing compound, and the second wood powder-containing compound is melted to obtain a desired Since it is molded into a shape, a wood-like molded product having a low water absorption rate can be produced. As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. In addition, since the adsorption of water can be inhibited by the acetylation treatment with the wood waste material pulverized powder, the familiarity between the wood powder and the resin is improved, and the strength can be improved.
In addition, the waste material mixed resin is roughly pulverized to 20 mm or less, then fused and solidified, further pulverized, and then kneaded and molded with the pulverized thermoplastic resin and acetylated wood flour to form a second wood-containing compound. Is formed into a required shape, so that a waste material mixed resin coarsely pulverized product, a thermoplastic resin, and an acetylated wood powder are uniformly mixed, and such a second wood powder-containing compound is melted. By molding into a required shape, a wood-like molded product can be easily obtained.
Further, since the waste material mixed resin is made into a solidified pulverized powder and then kneaded and molded to produce the second wood powder-containing compound, compared with the first embodiment, the thermosetting resin, impurities, heat The plastic resin can be more uniformly mixed without separation, and the moldability is improved.

  In the third embodiment, the first wood flour-containing compound using the acetylated wood flour of the first embodiment and the second wood flour-containing compound using the acetylated wood flour of the second embodiment. Are manufactured respectively. Then, the first wood powder-containing compound and the second wood powder-containing compound are mixed and melted in a molding process and molded into a required shape by an extrusion molding machine or an injection molding machine (not shown).

According to the 3rd Embodiment of this invention, adsorption | suction of water can be inhibited by performing an acetylation process to wooden waste material ground powder. And using such acetylated wood flour, the 1st wood flour containing compound and the 2nd wood flour containing compound are manufactured, the 1st wood flour containing compound and the 2nd wood flour containing compound are mixed and melted. Therefore, a wood-like molded product having a low water absorption rate can be produced. As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. In addition, since the adsorption of water can be inhibited by the acetylation treatment with the wood waste material pulverized powder, the familiarity between the wood powder and the resin is improved, and the strength can be improved.
In addition, each of the first wood flour-containing compound and the second compound is manufactured, mixed, melted and molded into the required shape, so that the waste material mixed resin coarsely pulverized product, thermoplastic resin, and acetylated wood powder are uniformly distributed. It becomes a mixed molded product, and by mixing and melting such a first wood powder-containing compound and a second wood powder-containing compound, and molding into a desired shape, a wood-like molded product can be easily obtained. .

  As shown in FIG. 3, in the fourth embodiment, the wood waste material is pulverized by a pulverization step to obtain a wood waste material pulverized powder. Then, the wood waste material pulverized powder after the tertiary pulverization step is immersed in acetic anhydride at 120 ° C. for 24 hours in the same manner as in the first embodiment, taken out, washed with water and dried to perform acetylation treatment. . On the other hand, the waste material mixed resin obtained from the resin waste material is pulverized to 1 mm or less by using, for example, a hammer mill to obtain a waste material mixed resin pulverized product, the waste material mixed resin pulverized product, the pulverized thermoplastic resin, The chemical powder is kneaded and melted and molded into a required shape by an extrusion molding machine or an injection molding machine.

According to the fourth embodiment of the present invention, it is possible to inhibit the adsorption of water by performing an acetylation treatment on the wood waste material pulverized powder. And since such acetylated wood flour, waste resin mixed resin pulverized product, and thermoplastic resin are kneaded and melted and molded into a desired shape, a wood-like molded product with low water absorption can be produced. . As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. In addition, since the adsorption of water can be inhibited by the acetylation treatment with the wood waste material pulverized powder, the familiarity between the wood powder and the resin is improved, and the strength can be improved.
In addition, since the waste material mixed resin is pulverized to 1 mm or less, and then kneaded and melted with the pulverized thermoplastic resin and acetylated wood flour, it is molded into the required shape. In comparison, the waste material mixed resin is more finely pulverized, and the pulverized waste material mixed resin pulverized product, the thermoplastic resin, and the acetylated wood powder are more evenly mixed. Also, for example, it can be easily produced in extrusion molding having a hollow shape.

As shown in FIG. 4, in the fifth embodiment, the wood waste material is pulverized by the pulverization step to obtain a wood waste material pulverized powder. Then, the wood waste material pulverized powder after the tertiary pulverization step is immersed in acetic anhydride at 120 ° C. for 24 hours in the same manner as in the first embodiment, taken out, washed with water and dried to perform acetylation treatment. . On the other hand, the waste material mixed resin obtained from the resin waste material is pulverized to 20 mm or less using, for example, a hammer mill to obtain a waste material mixed resin coarsely pulverized product. It is made to melt | fuse and solidify under a waste material mixed resin solidified material. Furthermore, this waste material mixed resin solidified product is pulverized to obtain a solidified product pulverized powder.
Next, the pulverized solid powder, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and melted and molded into a required shape by an extrusion molding machine or an injection molding machine.

According to the fifth embodiment of the present invention, the adsorption of water can be inhibited by subjecting the wood waste material pulverized powder to an acetylation treatment. And since such acetylated wood powder, solidified pulverized powder, and thermoplastic resin are kneaded and melted and formed into a desired shape, a wood-like molded product with low water absorption can be produced. As a result, it is possible to prevent dimensional changes over a long period due to water absorption or moisture absorption, deformation and cracking due to uneven water absorption conditions, and the like. Further, the acetylation treatment with the wood waste material pulverized powder can inhibit the adsorption of water, improve the familiarity between the wood powder and the resin, and can improve the strength.
In addition, since the waste material mixed resin solidified material is pulverized to 1 mm or less, and then kneaded and melted with the pulverized thermoplastic resin and acetylated wood flour, the first to third embodiments are performed. Compared with the form, the waste material mixed resin is more finely pulverized, and the pulverized waste material mixed resin pulverized product, the thermoplastic resin, and the acetylated wood powder are more evenly mixed. Also, for example, it can be easily produced in extrusion molding having a hollow shape.
Further, the waste material mixed resin solidified product is obtained by roughly crushing the waste material mixed resin to 20 mm or less, and then fusing and solidifying it. Compared with the fourth embodiment, the thermosetting resin, impurities The thermoplastic resin can be uniformly mixed without being separated, and the moldability is improved.

In the second to fifth embodiments of the present invention, the description after the molding process is omitted, but the embossing process, the hairline processing process, and the coloring are performed on the wood-like molded product as in the first embodiment. Surface treatment is performed by performing a processing step, a drying step, a polishing step, a painting step, and the like.
Further, the wood-like molded product according to the second to fifth embodiments of the present invention includes 5 to 20 wt% of the waste material mixed resin and 25 to 40 wt% of the thermoplastic resin with respect to the entire molded product. It is manufactured by adjusting the blending amount so that 10 to 55 wt% of acetylated wood flour is contained.

  The extruder used in the embodiment of the present invention may be a single screw extruder or a twin screw extruder.

なお、含水率は、アセチル化木粉及び木質廃材粉砕粉をそれぞれ１２０℃で乾燥し、恒量に達したと認められるときの重量と乾燥前の重量とから計測したものである。
また、灰分は、８００℃で２時間燃焼させた場合の計測結果である。 Next, the effects of the method for producing a wood-like molded product according to the present invention were clarified by the following tests.
As described above, the wood waste material is subjected to primary pulverization, secondary pulverization, and tertiary pulverization steps to obtain a wood waste material pulverized powder. The obtained wood waste material pulverized powder is immersed in acetic anhydride at 120 ° C. for 24 hours, taken out, washed with water, and dried to obtain acetylated wood powder.
On the other hand, the wood waste material pulverized powder after the tertiary pulverization process without acetylation treatment is prepared, and the physical properties in the wood powder state of this wood waste material pulverized powder (comparative example) and the acetylated wood powder (example of the present invention) The test items shown in Table 1 were evaluated.

The moisture content was measured from the weight when the acetylated wood powder and the wood waste material pulverized powder were each dried at 120 ° C. and recognized to have reached a constant weight and the weight before drying.
The ash content is a measurement result when burned at 800 ° C. for 2 hours.

なお、吸水率は、４０℃の水を９６時間吸水させた場合の計測結果であり、また、このときの寸法変化（長さ、幅、厚み）についても計測した。 Next, regarding the physical properties in the press sheet state of the wood-like molded product (example of the present invention) produced from acetylated wood powder and the wood-like molded product (comparative example) produced from wood waste material ground powder not subjected to acetylation treatment The test items shown in Table 2 were evaluated. The compounding amounts of the waste material mixed resin, the thermoplastic resin, and the acetylated wood powder (or the wood waste material pulverized powder) were as described above, and each press sheet was produced.

The water absorption rate is a measurement result when water at 40 ° C. was absorbed for 96 hours, and the dimensional change (length, width, thickness) at this time was also measured.

From the results in Table 1, it is recognized that the acetylated wood powder has a lower water content than the pulverized wood waste powder not subjected to acetylation treatment, and the ash content has been reduced to less than half by the acetylation treatment. . This is because acetylated wood flour is washed away during the treatment, and it is considered that this ash also reflects the light bulk density.
From the results of Table 2, it can be said that press sheets prepared from acetylated wood flour are improved in bending strength and Young's modulus by performing acetylation treatment, and the familiarity between wood flour and resin is improved. Furthermore, with respect to the water absorption characteristics, the press sheet that has been subjected to the acetylation treatment has a water absorption rate halved as compared with the press sheet that has not been subjected to the acetylation treatment, and a large modification effect is recognized. In addition, it turns out that the dimensional change is also improved by performing an acetylation process.

It is for showing the 1st Embodiment of this invention, and is a conceptual diagram which shows the manufacturing method of a wood-like molded product. It is for showing the 2nd Embodiment of this invention, and is a conceptual diagram which shows the manufacturing method of a wood-like molded article. It is for showing the 4th Embodiment of this invention, and is a conceptual diagram which shows the manufacturing method of a wood-like molded product. It is for showing the 5th Embodiment of this invention, and is a conceptual diagram which shows the manufacturing method of a wood-like molded product.

Claims (6)

Manufacture of wood-like molded products, which are obtained from resin waste materials, and include waste material mixed resin obtained by mixing thermoplastic resin, thermosetting resin and impurities, and wood waste material pulverized powder obtained by pulverizing wood waste material A method,
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
The waste material mixed resin coarsely pulverized product, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and molded to produce a first wood powder-containing compound,
A method for producing a wood-like molded product, wherein the first wood powder-containing compound is melted and molded into a required shape. Manufacture of wood-like molded products, which are obtained from resin waste materials, and include waste material mixed resin obtained by mixing thermoplastic resin, thermosetting resin and impurities, and wood waste material pulverized powder obtained by pulverizing wood waste material A method,
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
This waste material mixed resin coarsely pulverized product is fused and solidified to obtain a waste material mixed resin solidified product,
This waste material mixed resin solidified material is pulverized into a pulverized solidified powder,
The solidified product pulverized powder, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and molded to produce a second wood powder-containing compound,
A method for producing a wood-like molded product, characterized in that the second wood powder-containing compound is melted and molded into a required shape. Manufacture of wood-like molded products, which are obtained from resin waste materials, and include waste material mixed resin obtained by mixing thermoplastic resin, thermosetting resin and impurities, and wood waste material pulverized powder obtained by pulverizing wood waste material A method,
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
The waste material mixed resin coarsely pulverized product, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and molded to produce a first wood powder-containing compound,
Meanwhile, the waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
This waste material mixed resin coarsely pulverized product is fused and solidified to obtain a waste material mixed resin solidified product,
This waste material mixed resin solidified material is pulverized into a pulverized solidified powder,
The solidified product pulverized powder, the pulverized thermoplastic resin, and the acetylated wood powder are kneaded and molded to produce a second wood powder-containing compound,
A method for producing a wood-like molded article, wherein the first wood powder-containing compound and the second wood powder-containing compound are mixed and melted and molded into a required shape. Manufacture of wood-like molded products, which are obtained from resin waste materials, and include waste material mixed resin obtained by mixing thermoplastic resin, thermosetting resin and impurities, and wood waste material pulverized powder obtained by pulverizing wood waste material A method,
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is pulverized to 1 mm or less to obtain a waste material mixed resin pulverized product,
A method for producing a wood-like molded product, comprising kneading and melting the waste material mixed resin pulverized product, the pulverized thermoplastic resin, and the acetylated wood flour into a desired shape. Manufacture of wood-like molded products, which are obtained from resin waste materials, and include waste material mixed resin obtained by mixing thermoplastic resin, thermosetting resin and impurities, and wood waste material pulverized powder obtained by pulverizing wood waste material A method,
An acetylated wood powder is obtained by subjecting the wood waste material pulverized powder to an acetylation treatment,
The waste material mixed resin is roughly pulverized to 20 mm or less to obtain a waste material mixed resin coarsely pulverized product,
This waste material mixed resin coarsely pulverized product is fused and solidified to obtain a waste material mixed resin solidified product,
This waste material mixed resin solidified product is pulverized to 1 mm or less to obtain a solidified product pulverized powder,
A method for producing a wood-like molded product, comprising kneading and melting the solidified pulverized powder, the pulverized thermoplastic resin, and the acetylated wood powder into a desired shape. In the manufacturing method of the wood-like molded article in any one of Claims 1-5,
For the whole molded product,
The method for producing a wood-like molded article, wherein the waste material mixed resin is contained in an amount of 5 to 20 wt%, the thermoplastic resin is contained in an amount of 25 to 40 wt%, and the acetylated wood flour is contained in an amount of 10 to 55 wt%.

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