JPH11300711A - Wooden resin molded article and material for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wooden resin molded article prepd. by molding a powdery or granulate material contg. a thermosetting resin comprising a ground product of a wooden waste material and a thermosetting resin represented by phenol resins as raw materials. SOLUTION: A wooden resin molded article obtd. by compression molding of a wooden powdery or granulate material contg. a thermosetting resin contg. 55-75 pts.wt. ground product of a wooden waste material and 25-45 pts.wt. thermosetting resin as main ingredients under a condition where the molding pressure is at most 50-100 kgf/cm<2> and the temp. is 150-170 deg.C is provided and it exhibits a density of 1.25-1.45 g/cm<3> and a bending strength of 8-11 kgf/mm<2> and excellent surface hardness and luster.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood-based resin molded article using wood-based waste material and a material thereof. More specifically, the present invention relates to a high-speed stirring mixer for mixing a thermosetting resin represented by a phenolic resin or the like into a pulverized waste material such as a wood fiber board, a wood decorative board, a laminate board, a composite board, and a particle board. The present invention relates to a wood-based resin molded product obtained by compression-molding a powdery or granular material containing a thermosetting resin mixed by a dry method under heating.

The present invention utilizes waste materials such as wood-based decorative boards and recycled products as raw materials, and is useful as an effective use of construction waste materials and the reuse of resources.

[0003]

2. Description of the Related Art Examples of conventional products similar to the woody resin molded article according to the present invention include a so-called MDF, a woody fiberboard, a woody decorative board, a woody laminate, and a woody composite board. Can be.

[0004] Conventional wood-based fiberboards are generally prepared by mixing a binder (adhesive) such as a liquid synthetic resin by a wet method with a fibrous material such as pulp obtained by defibrating and washing a ground substrate. After that, it is manufactured by dehydration treatment, forming (forming), and press-molding with a hot press. Such a wood fiber board has a relatively low specific gravity in terms of weight reduction and the like, but has a low mechanical strength such as bending strength, and also has a low surface hardness.
Furthermore, the surface gloss or the smoothness is poor. For this reason, a surface material is adhered to the surface in order to reinforce the strength or improve the surface condition.

[0005] In addition, a wood-based laminated board and a composite board are usually formed by laminating a wood chip material treated with a resin by a wet method and a wood-based powder treated with a resin into an appropriate layer, shaping, and then applying heat and pressure by a hot press. It is manufactured by molding. Such a wooden laminate, composite board is usually so-called core material and surface material, or core material, intermediate material, and surface material are individually preformed to reduce the weight, or these are laminated and integrally molded, Alternatively, a core material layer may be laminated on the surface material layer, or the surface material layer, the intermediate material layer, and the core material layer may be laminated on an appropriate layer, shaped, and then molded by heating and pressing by a hot press. However, these methods complicate the manufacturing process and increase the cost.

Various proposals have conventionally been made for wood-based fiber boards, laminated boards, composite boards, and the like.
For example, Japanese Patent Application Laid-Open No. Hei 5-269977 discloses a method of manufacturing a paper base laminate by dry laminating a raw material composed of pulp and a phenol resin having thermoformability to form a pulp / phenol resin composite web and then hot pressing. Has been disclosed. In Japanese Patent Application Laid-Open No. 8-332611, in order to improve the strength (particularly, bending strength) of a particle board, a wood chip and a core layer mainly composed of a thermosetting resin are coated on both front and back surfaces of a wood fiber and a thermosetting resin. Disclosed is a particle board in which a front and back layer is formed using a strand-like chip as a material for forming the front and back layers in a multilayer structured particle board.

Japanese Patent Application Laid-Open No. 9-85716 discloses that two types of wood core chips and sapwood chips are used, and a predetermined amount of core material is used so that the weight ratio of the wood chips is 20 to 100% of the total amount. A wood fiber board in which chips and sapwood chips are mixed is disclosed. Japanese Patent Application Laid-Open No. 9-76413 discloses a laminated board which can be used for building materials in which a wood fiber layer composed of a medium-density fiberboard is disposed only on the surface or on both sides, and a composite board layer is disposed between the wood fiber layers on the front and back. Have been.

Japanese Patent Application Laid-Open No. 9-302145 discloses dewatering and molding a mixture obtained by stirring and mixing wood flour and / or coal ash, starch and water of industrial waste. Is disclosed. Japanese Patent Application Laid-Open No. 9-
No. 254102 discloses a wood-based decorative board in which decorative paper or veneer is integrally adhered to the surface of a wood-based fiberboard via a nonwoven fabric impregnated with a hot-melt adhesive in advance.

[0009]

As described above, the conventional wooden fiberboard has a laminated structure in which a core layer is interposed or a surface layer is provided to reinforce the strength or improve the surface condition. ing. The present invention does not require a complicated manufacturing process such as a laminated structure such as a conventional wooden fiberboard and the like, despite the fact that wooden waste materials and recycled products are used as raw materials, and the mechanical strength is high. An object of the present invention is to provide a wood-based resin molded article having excellent surface gloss, excellent surface hardness, weight, and high quality.

[0010]

Means for Solving the Problems The woody resin molded product of the present invention can be obtained by mixing a thermosetting resin represented by a phenolic resin homogeneously with a pulverized woody waste material by mechanical means. The powdery or granular material is produced by compression molding under the same means as in the case of molding a conventional synthetic resin, that is, under heat and pressure.

That is, the present invention provides a pulverized wooden waste material 5
Wood-based resin molding obtained by compression-molding a powdery or granular material containing a thermosetting resin containing 5-75 parts by weight and 25-45 parts by weight of a thermosetting resin as main components under heating About the body.

Further, the present invention provides a pulverized woody waste material 5
A powdery or granular material containing a thermosetting resin containing 5 to 75 parts by weight and 25 to 45 parts by weight of a thermosetting resin is pressed at a pressure of 50 to 100 kgf / cm ² and a temperature of 150 to 150 kgf / cm ² .
Density 1.25 to 1.1 obtained by compression molding at 170 ° C.
The present invention relates to a wood-based resin molded article having 45 g / cm ³ , a bending strength of 8 to 11 kgf / mm ^2, and having excellent surface hardness and glossiness.

The present invention also provides a pulverized woody waste material 55-55.
75 parts by weight was charged to a high-speed stirring mixer, and an organic solvent was added to the pulverized waste material in an amount of 10 to 20 parts by weight.
A wood-based resin molding method comprising adding 25 to 45 parts by weight (in terms of solid content) of a thermosetting resin solution while mixing, mixing and granulating, and drying the granulated mixture at a temperature of 80 to 110 ° C. It is intended to provide a body material.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The wood-based resin molded product according to the present invention
Using a high-speed stirring mixer, 55 to 75 parts by weight of the wood-based waste material pulverized material, and the organic solvent added to the waste material pulverized material for 10 to 20 parts
Parts by weight, stirring and mixing, and then thermosetting resin solution 2
A powdery or granular material containing a thermosetting resin obtained by adding 5 to 45 parts by weight (in terms of solid content), mixing and granulating, and drying the granulated mixture at a temperature of 80 to 110 ° C. Can be produced by compression molding under heating.

The pulverized wood-based waste material used for the wood-based resin molded article of the present invention is a pulverized wood-based waste material such as a wood fiber board, a wood decorative board, a laminated board, a composite board, and a particle board. As the pulverized product used in the present invention, powder having a size of 80 mesh pass or less is generally used. Usually, a fine powder of 50 mesh pass or less is preferable. If the size exceeds 80 mesh, the dispersion of the resin upon mixing with the resin is insufficient and uniform mixing cannot be obtained, which is not preferable.
Further, in the present invention, the above-mentioned pulverized waste material is used as it is without washing and pulping into a fibrous form as in the related art.

In the present invention, the pulverized wood-based waste material is used in an amount of 55 to 75 parts by weight of the total amount of the material, and if necessary, 5 to 20% by weight based on the pulverized waste material. Wood flour can be used in the range. This wood flour is 1
Those having a particle size of 00 mesh pass are preferred. By mixing the wood powder, the strength of the formed wood-based resin molded article can be further increased.

As described above, the material used for molding the wood-based resin molded article of the present invention comprises a pulverized waste material and a thermosetting resin typified by a phenolic resin with the addition of wood flour if necessary. It can be obtained by stirring, mixing and granulating with a high-speed stirring mixer such as a Henschel mixer or a super mixer.

Specifically, a predetermined amount of the pulverized waste material is charged into a high-speed stirring mixer such as a Henschel mixer, wood powder is added if necessary, and a small amount of an organic solvent, usually 5 to 20 wt. Parts of the waste material are wetted to wet the pulverized waste material, and then a thermosetting resin solution typified by a phenolic resin is added in an amount of 25 to 45 parts by weight in terms of solid content, mixed and granulated. The obtained granulated product is heated with a hot air drier,
It is manufactured by drying at a temperature of 80 to 110 ° C for 10 to 30 minutes. The material used for the wood-based resin molded article of the present invention thus obtained is a powdery or granular material, and has a flow characteristic similar to that of an ordinary phenolic resin compression molding material.

The powdery or granular material thus produced is heated at a temperature of 150-170 ° C. and 50-100 k.
gf / cm ² , preferably 75-100 kg f / cm ²
By subjecting the mixture to compression molding under pressure, the desired wood-based resin molded product can be obtained. The molding time depends on the molding temperature, molding pressure and the like, but is usually about 3 to 20 minutes.

The thermosetting resin in the present invention includes a phenolic resin, an amino resin, an epoxy resin, an unsaturated polyester resin, a diallyl phthalate resin and the like. Typically, a phenolic resin is used. If necessary, other resins may be appropriately mixed.

These resins may be used in the form of a powder or a solution, but are preferably used in the form of a solution dissolved in an appropriate solvent from the viewpoint of dispersibility in pulverized waste materials, and usually used as a solution. In this case, the resin content is usually 25 to 4
Used as a solution of 5 parts by weight (solid content).

The organic solvent is used in an amount of 10 to 10
20 parts by weight are used. As such an organic solvent, a low-boiling organic solvent having an affinity for the resin used is used. For example, in the case of a phenolic resin, alcohols such as methanol and ethanol, ketones such as acetone and methyl ethyl ketone are used. And at least one of ethers.

The wood-based resin molded article of the present invention has the same properties as conventional wood-based fiber boards, even though waste materials such as wood-based fiber boards and wood-based decorative boards and recycled products are used as raw materials. It does not require complicated manufacturing steps, has excellent mechanical strength, has surface gloss, is excellent in surface hardness, has a heavy feeling, and has a high quality feeling.

In addition, the woody resin molded article of the present invention hardly generates formaldehyde odor or formaldehyde which is observed in conventional woody fiberboards, laminates, particle boards and the like.

The wood-based resin molded article of the present invention can be relatively easily processed by drilling or the like, so that it can be used as a part or member for a house building or a member such as furniture. It is suitable for.

Further, the woody resin molded article of the present invention may be formed into a molded article having a woodgrain pattern by adding a pattern sheet such as a woodgrain pattern to the surface of the molded article, if desired. Can be. Further, the wood grain pattern, the pattern pattern, and the like can be provided on the surface by integrally molding in a mold using a sheet provided with the wood grain pattern, the pattern pattern, and the like at the time of molding.

An embodiment of the present invention will be described below.

Example 1 70 parts by weight of a pulverized wood-based decorative plywood (80 mesh pass) and 5 parts by weight of wood powder of a 100 mesh pass were charged into a Henschel mixer, and 10.5 parts by weight (1 part by weight based on the pulverized material) was used.
(Equivalent to 5%) of methanol was added, stirred and mixed, and then 25 parts by weight of a resole-type phenol resin (35.7 parts by weight of a liquid resin having a resin concentration of 70%) was added, mixed for 5 minutes, and granulated. Thereafter, the obtained granulated product was dried at 90 ° C. for 90 minutes by a hot air circulation type drier to obtain a granular material. The material was heated at a temperature of 160 ° C. and a pressure of 100 kgf / cm.
The plate was compression molded under the conditions of ² for 30 minutes to obtain a plate-like molded body having a thickness of 3.0 mm. Table 1 shows the physical properties of the molded product.

Example 2 55 parts by weight of the same pulverized material as used in Example 1 and 10 parts by weight of wood flour were charged into a Henschel mixer, and 8 parts by weight of methanol was added thereto, followed by stirring and mixing. 35 parts by weight of phenol resin (resin concentration 70%)
50 parts by weight of a liquid resin), and after mixing and granulating,
A plate-like molded body was obtained in the same manner as in Example 1, except that the molded product was dried at 90 ° C. for 120 minutes using a hot-air circulation dryer. Table 1 shows the physical properties of the molded product.

Example 3 The procedure of Example 2 was repeated, except that an aqueous melamine resin solution having a resin concentration of 70% by weight was used instead of the phenol resin.
A plate-like molded body was obtained. Table 1 shows the physical properties of the obtained molded body.

Comparative Example 1 85 parts by weight of the same pulverized material as used in Example 1 was charged into a Henschel mixer, and 13 parts by weight of methanol was added thereto, followed by stirring and mixing. Then, after mixing and granulating for 5 minutes, the granulated material was dried at 90 ° C. for 60 minutes by a hot-air circulation dryer to obtain a powdery material. The material was molded in the same manner as in Example 1 to obtain a plate-like molded body. Table 1 shows the physical properties of the molded product.

Comparative Example 2 The same pulverized material (42 parts by weight), wood flour (8 parts by weight), methanol (4 parts by weight) and resol type phenol resin (50 parts by weight) as in Example 1 were mixed with a Henschel mixer in the same manner as in Example 1. A granulation operation was performed. However, the contents became dango-like during the mixing process in the Henschel mixer, and good materials could not be obtained.

[0033]

[Table 1]

[0034]

According to the present invention, despite the use of waste materials such as decorative wooden fiberboard and recycled products as raw materials, complicated manufacturing steps such as those of conventional wooden fiberboard are required. To provide a wood-based resin molded article with excellent mechanical strength, excellent surface gloss, excellent surface hardness, weight, and high quality. It is useful as resource recycling.

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI B29K 511: 14

Claims (12)

[Claims] 1. A thermosetting resin-containing powdery or granular material containing 55 to 75 parts by weight of a pulverized woody waste material and 25 to 45 parts by weight of a thermosetting resin is compression-molded under heating. Wood-based resin molded product obtained by: 2. A powdery or granular material containing a thermosetting resin containing 55 to 75 parts by weight of a pulverized wood-based waste material and 25 to 45 parts by weight of a thermosetting resin is pressed at a pressure of 50 to 10 parts.
It has a density of 1.25 to 1.45 g / cm ³ and a bending strength of 8 to 11 kgf / mm ² obtained by compression molding at 0 kgf / cm ² and a temperature of 150 to 170 ° C., and has excellent surface hardness and glossiness. Wood-based resin molded product. 3. 5 to 20% by weight based on the pulverized woody waste material
The wood-based resin molded product according to claim 1 or 2, wherein wood powder is blended. 4. The wood-based resin molded product according to claim 1, wherein the pulverized wood-based waste material has a particle size of 80 mesh passes. 5. A wood-based waste material pulverized material (55 to 75 parts by weight) is charged into a high-speed stirring mixer, and an organic solvent is added to the waste material pulverized material in an amount of 10 to 20 parts by weight. After adding and mixing and granulating 25 to 45 parts by weight (in terms of solid content) of the resin solution, the granulated mixture is heated to a temperature of 80 to 1.
A material for a powdery or granular wood-based resin molded product, which is dried at 10 ° C. 6. 5 to 20% by weight of the pulverized woody waste material
The wood-based resin molded material according to claim 5, wherein wood powder is blended. 7. The material for a wood-based resin molded product according to claim 5, wherein the pulverized wood-based waste material has a particle size of 80 mesh passes. 8. The wood-based resin molded product according to claim 1, wherein the crushed wood-based waste material is a wood-based decorative board, a wood-based composite board, a particle board, a wood-based compressed board, or the like. 9. The material for a wood-based resin molded product according to claim 5, wherein the pulverized wood-based waste material is a waste material such as a wood-based decorative board, a wood-based composite board, a particle board, and a wood-based compressed board. 10. A wood resin molding according to claim 1, wherein the thermosetting resin is at least one of a phenol resin, an amino resin, an unsaturated polyester resin and an epoxy resin. 11. The wood-based resin molded material according to claim 5, wherein the thermosetting resin is at least one of a phenolic resin, an amino resin, an unsaturated polyester resin, and an epoxy resin. 12. The organic solvent is a low-boiling organic solvent having an affinity for a thermosetting resin, and is at least one of alcohols such as methanol and ethanol, ketones such as acetone and methyl ethyl ketone, and ethers. 5. The material for a wood-based resin molded article according to 5.