JPS6317004A - Ligneous composite material - Google Patents

Abstract

PURPOSE:To obtain a material, which has favorable appearance, touch and stain resistance and is excellent in durability and suitable for panel material by a method wherein a ligneous composite material, which is produced by imbedding a large number of wooden chips in synthetic resin and the resultant surface of which is ground, is empolyed as surface material. CONSTITUTION:After the reduction of the water content of wooden chips 1 under green state by drying under heat, the wooden chips 1 are immersed in unsaturated polyester resin or the like and impregnated with the resin and cured. On the other hand, the predetermined amount of the wooden chips subjected to said dimensionally stabilizing treatment is charged in liquid hardening resin such as unsaturated polyester resin or the like or a hardening resin mixture consisting of said liquid hardening resin and filler such as calcium carbonate blended and dispersed with each other and agitated. The surface of a board 4 is treated with primer such as epoxy resin or the like under the state that a frame is provided in the periphery of the board 4 in order to enhance the adhesion. Under the condition as just described above, the mixture of the resin and the wooden chips is cast over the surface of the board 4 and leveled so as to cure the resin at normal temperatures or under heat. After that, the surface of the resultant board is ground with a sanding device in order to obtain a composite material 3 bonded to a board.

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention is a wood-based composite material that is suitably used as a surface material for wooden fixtures such as tables, counters, and furniture, and wooden building materials such as flooring and wall materials. By embedding a large number of small pieces of wood in a synthetic resin and grinding the surface, a good texture and aesthetic appearance can be obtained, and stain resistance can be improved.

[Prior art and its problems]

Conventionally, surface materials used as surface boards for tables and the like include wood alone or wood thin boards adhered to a plywood base plate. This surface material has the characteristics of maintaining the beauty of wood and being soft to the touch, but it also has abrasion resistance and
There are problems in that water resistance and stain resistance are insufficient, and durability is unsatisfactory.

[-Means for solving problems]

Therefore, in this invention, by embedding a large number of small pieces of wood in a synthetic resin and using a wood-based composite material whose surface is ground as a surface material, it has a good appearance, feel, and stain resistance. Improved durability.

The present invention will be explained in detail below.

FIG. 1 and FIG. 2 both show an example of the wood-based composite material of the present invention, and the reference numeral 1 in the figures is a small piece of wood.

This small piece of wood 1 includes black tongue, beech, oak, horse chestnut, Japanese horse chestnut,
Small pieces of wood such as hardwoods such as ash, maple, birch, and oak, and coniferous trees such as cedar, cypress, pine, subruce, and agathis, and the shape thereof is not particularly limited, but may be in the form of a plate, rectangular parallelepiped, or cube. Various shapes are used, such as small pieces formed by cutting such as triangular prism, square prism, and cylinder, or small pieces crushed by mechanical impact or roller pressure. The size of this small piece 1 is, for example, when the shape is approximately rectangular parallelepiped.
3-50g*1 width 3-501a1 approx. 3-1100a, preferably Ii5-10Ill#+1 width 5-10#
III, and the length is about 5 to 30 ae+. This small piece of wood 1 can be made of leftover wood after sawing, damper wood, offcut wood, etc., and there is no problem even if wood pieces of different species or colors are mixed in.

The small piece of wood 1 may also be subjected to dimensional stabilization treatment if necessary. Dimensional stabilization treatments include acetylation treatment in which small pieces of wood are treated with acetic anhydride, methods of impregnating them with polyethylene glycol or polypropylene glycol, methods of heating small pieces of wood, methods of treating small pieces of wood with smoking, liquid phenolic resin, and epoxy. There are methods of impregnating and solidifying resins such as resins, urethane resins, and acrylic resins. Further, it is also possible to mix several percent of an organic halogen preservative into polyethylene glycol or various liquid resins to perform antiseptic treatment simultaneously with the dimensional stabilization treatment.

In addition, the small piece of wood 1 may contain one or two types of part or all of it.
Although it is possible to use wood that has been colored to a different tone than the species, it is also preferable to make use of the natural color of the wood, such as black such as ebony, yellow such as brick and buttock, and white such as oak and beech.

The coloring treatment is carried out using a coloring agent A degree of 0.1 to 10% by weight dissolved in a coloring solution of a coloring agent such as a dye or pigment dissolved in a solvent such as water or an organic solvent. A method such as immersing a large number of small pieces of wood 1 in a coloring solution of 10% is used.

It is also possible to heat the coloring solution to promote penetration of the coloring solution, thereby producing a deep color.

Further, during the dimensional stabilization treatment, a coloring agent can be dissolved in polyethylene glycol or various liquid resins, and the coloring treatment can be performed simultaneously with the dimensional stabilization treatment.

Many of these small pieces of wood 1 are made of synthetic resin 2.
It is buried inside to form a plate-shaped wood-based composite material 3. Suitable examples of the synthetic resin 2 include thermosetting resins that are liquid before curing, such as unsaturated polyester resins, polyurethane resins, epoxy resins, phenol resins, and acrylic resins. Further, a powdered thermoplastic or thermosetting resin can also be used.

In addition, to this synthetic resin 2, in order to increase hardness and heat resistance, and to reduce costs, non-purchased fillers such as calcium carbonate and talc are added and mixed to about 700 parts by weight per 100 parts by weight of the resin. It is also possible to use It is also possible to use a colored synthetic resin mixed with a coloring agent. Furthermore, by selecting the same type of resin as that used during the dimensional stabilization treatment, the small wood piece 1...
The adhesion between ・and synthetic resin 2 is improved, and the small piece of wood 1...
This is preferable because it can prevent peeling and the like.

The abundance ratio of the wood particles 1... and the synthetic resin 2 in the wood-based composite material 3 is about 1:1 to 20:1 in terms of volume ratio, but the small particles are present on the surface of the composite material 3. It is preferable that a beautiful appearance can be obtained by unevenly distributing many small pieces 1... so that many small pieces 1... are exposed on the surface and increasing the density of small pieces 1... on the surface. However, if the proportion of the small pieces of wood 1 is too large, the adhesion with the synthetic resin will decrease, which is not preferable.

This composite material 3 also has a ground surface. This surface grinding is for smoothing out slight irregularities on the surface and removing the synthetic resin 2 covering the surface of the small pieces of wood 1, and is carried out using a normal sanding device or the like.

Such a wood-based composite material 3 has dimensions of 500 to 1
800a*, width 500-900IllI11 thickness 1-5
#ll18a.

In the wood-based composite material of the present invention, as shown in FIG. 1, the composite material 3 may be fixed and integrated onto a substrate 4. Board 4
For this purpose, board materials such as plywood, verticle board, gypsum board, calcium silicate board, and wood wool cement board with a thickness of 1 to 5s+ are used. By using the substrate 4, the composite material 3
The main body can be made thinner.

Next, an example of a method for manufacturing such a wood-based composite material 3 will be explained.

First, the small piece of wood 1 is subjected to a dimension stabilization treatment. If the small piece of wood 1 is not yet dried, it is heated and dried to reduce the moisture content, and then
It is immersed in a resin liquid such as polyethylene glycol or unsaturated polyester resin to impregnate the small piece of wood 1 with the resin and harden it. In addition, if the small piece of wood is dry, store it in a pressure-resistant container such as an autoclave, reduce the pressure inside, inject the resin liquid, impregnate the small piece of wood, and then pressurize it to penetrate inside and harden. . Of course, it is also possible to dissolve a coloring agent in the resin liquid and carry out the coloring treatment at the same time.

On the other hand, a curable resin liquid such as an unsaturated polyester resin, an epoxy resin, a polyurethane resin, or a curable resin mixture in which a filler such as calcium carbonate or talc is mixed and dispersed therein is prepared.

Next, a predetermined amount of the size-stabilized wood pieces 1 are added to the curable resin liquid or curable resin mixture and stirred.

Then, a frame is provided around the substrate 4, and the surface of the substrate 4 is treated with a brimer such as polyurethane resin or epoxy resin to improve adhesion, and then a mixture of resin and small pieces of wood is applied to the surface of the substrate 4. After pouring the resin into a glass and smoothing the surface, the resin is cured at room temperature or under heating. As a result, the small piece of wood 1, the synthetic resin 2, and the substrate 4 are joined and integrated.

Then, by grinding the surface of the composite material thus obtained by sanding, the desired composite material 3 with a substrate can be obtained.

Further, if a reinforcing material such as a glass mu cloth, mat, or net is embedded in the bottom of the composite material 3, the substrate 4 can be omitted, and the thickness can be reduced and the weight can be reduced. If it is desired to omit the substrate 4, a mixture of resin and wood chips may be poured into the mold and allowed to harden.

[For production]

In such wood-based composite materials, many small pieces of wood are dispersed and buried in a synthetic resin, and the surface is ground.・
stand out and line up. Therefore, this deck material has the aesthetic appearance of wood, and the small pieces 1 on the surface give it a soft feel. In addition, since the small pieces of wood 1 are impregnated with resin through dimensional stabilization treatment, dirt will not stick to the small pieces 1 and will not come off, and the small pieces 1 will not absorb water. do not have. ) Moreover, the adsorption force with the synthetic resin 2 is high due to the resin impregnation of the small pieces of wood 1, and the small pieces 1 do not peel off.

〔Example〕

Beech, oak, etc. were cut into square pieces of about 10 to 20 InM, dried, and then immersed in an uncured solution of unsaturated polynisder resin to be impregnated with the resin solution and left at room temperature to form a semi-cured state.

On the other hand, a curable resin solution was prepared by adding 500 parts by volume of calcium carbonate and 0.5 parts by weight of a yellow pigment to 100 parts by volume of an uncured uncured polyester resin, and 100 parts by volume of the resin solution was prepared by adding the previously treated wood chips. 300 parts by volume were added and mixed well.

After applying a polyurethane resin brammer on a 2 m thick round plywood board (50 cA square) as a substrate, a frame was set up around it, the above mixture was poured into it, the mixture was leveled with a trowel, and then heated at about 50°C. It was cured to create a wood-based composite material with a thickness of 5M.

When a home dining table was made using this composite material and put into use, it maintained a beautiful appearance even after one year of use.
The wood pieces did not peel off and had a soft texture.

(Effects of the Invention) As explained above, the wood-based composite material of the present invention is made by embedding small pieces of wood in a synthetic resin and grinding the surface, so it has the beauty of wood and has a soft feel. It has the advantages of being highly durable, stain resistant, and easy to work with, and is suitable as panel material for wooden fixtures such as tables, counters, and furniture, and wooden building materials such as flooring and wall materials. It is used for urchino.

[Brief explanation of drawings]

1 and 2 both show an example of the wood-based composite material of the present invention, with FIG. 1 being a schematic sectional view and FIG. 2 being a front view. 1...Small pieces of wood, 2...Synthetic resin. Applicant: Nippon Gakki “A Ti Co., Ltd. Figure 1 Figure 2 Procedure-?RFF official document (spontaneous) l, Indication of the case 1985 Patent Application No. 161564 2, Name of the invention Wood-based composite material 3, Amendment person who does

Claims (2)

[Claims] (1) A wood-based composite material made by embedding small pieces of wood in synthetic resin and grinding the surface. (2) It is made from small pieces of wood that have been dimensionally stabilized. A wood-based composite material according to claim 1.