JPS584604B2 - Wood-synthetic resin composite - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wood-synthetic resin composite.

Conventionally, wood-synthetic resin composites have been produced by impregnating wood with a synthetic resin monomer or its oligomer solution, so that the internal voids of the wood are impregnated, resulting in a high specific gravity.

Furthermore, since the resin is impregnated into the pores of the wood, the amount of resin consumed is large, resulting in a disadvantage that the cost is relatively high.

Furthermore, when the resin liquid impregnated into the wood hardens, the resin liquid volatilizes and oozes out to a large extent, and the surface layer is not necessarily uniform.

In view of these conventional drawbacks, the inventor of the present invention has solved the above-mentioned drawbacks by using a synthetic resin liquid containing 30% to 70% filler dispersed therein and impregnating it only into the voids in the surface layer of the wood. This is what I did.

Embodiments of the present invention will be described below.

The wood in the present invention refers to log materials, bamboo materials, verticle boards, plywood, laminated materials, etc., and is generally processed wood materials.

In addition, the synthetic resin liquid to be impregnated into the wood may be one that has been used in the production of conventional wood-synthetic resin composites, such as polymerizable monomers and uncured thermosetting resins, such as styrene, acrylic, etc. Acid esters, vinyl acetate, vinylidene chloride, unsaturated polyesters, etc. are used.

Calcium carbonate, titanium oxide, clay, kaolin, etc. are used as fillers.

By dispersing 30% to 70% of this filler in the above-mentioned synthetic resin liquid, the synthetic resin liquid can be impregnated only into the voids in the surface layer of the wood, without impregnating the internal voids of the wood. It is.

In addition, if the dispersion of the filler into the synthetic resin liquid is 30% or less, the synthetic resin liquid will be impregnated into the internal voids of the wood, and the dispersion will be 70% or less.
If the filler is more than 30%, the synthetic resin liquid may ooze out from the wood surface, making it difficult to make the surface layer of the wood uniform.
% to 70% is preferable.

Furthermore, if the particle size of the filler is too large, it will not be dispersed in the synthetic resin liquid and will precipitate, so it is generally sufficient that the particle size is such that it can pass through a 100 mesh sieve.

The wood-synthetic resin composite of the present invention may be manufactured by a conventional manufacturing method, for example, sufficiently dried wood is placed in a tank that can be operated under reduced pressure or increased pressure, and the air inside the voids of the wood is removed by reducing the pressure. Next, a synthetic resin liquid with 30% to 70% filler dispersed is injected into the tank, and then an inert gas is pressurized to pressurize the tank to impregnate the voids in the wood with the synthetic resin liquid. It is.

At this time, fillers are dispersed in the synthetic resin liquid, so
The filler is filled into the voids in the surface layer of the wood, that is, the surface layer of the wood acts as a filter, and the synthetic resin liquid does not impregnate the internal voids of the wood, but only into the voids in the surface layer. It is.

Next, embodiments of the present invention will be described.

Example . Wood (lamin wood) was placed in an impregnation tank capable of both pressure reduction and pressure operation, and the pressure inside the tank was reduced to 5 mmHg, and the air inside the voids of the wood was removed by absorption for 2 hours.

Next, an uncured unsaturated polyester resin liquid containing a hardening agent in which 40% calcium carbonate was dispersed as a filler was poured into the above-mentioned tank.

Next, the inside of the tank was returned to normal pressure, and 35 kg of nitrogen gas was added.
The mixture was press-fitted to a pressure of cm2 and left as it was for 1 hour to obtain a wood-synthetic resin composite with an impregnation rate of 50% in which only the inside of the voids in the surface layer of the wood was impregnated.

Comparative Example Under the same conditions as in the example, an uncured unsaturated polyester resin liquid containing a curing agent in which no filler was dispersed was applied to wood (
A wood-synthetic resin composite was obtained with an impregnation rate of 95%, which was impregnated to the internal voids of the wood.

In addition, in the example, shrinkage and exudation during resin curing were smaller than in the comparative example, and a relatively uniform surface was obtained. A small wood-synthetic resin composite was obtained, and the amount of resin consumed was also small.

As described in detail above, in the present invention, a synthetic resin liquid containing 30% to 70% of a filler is impregnated into wood, so that the surface layer of the wood acts as a filter, and the filler acts as a filter in the surface layer 9 of the wood. The voids become clogged, and the synthetic resin liquid impregnates only the voids in the surface layer without penetrating into the internal voids of the wood, resulting in the resulting wood-synthetic resin composite having a specific gravity that is lower than the specific gravity of the wood itself. It is not very large and lightweight, shrinkage during curing of one resin and resin exudation are small, the amount of resin liquid impregnated, that is, the resin consumption is small, and it is inexpensive, and it is relatively uniform due to the sealing effect due to clogging of the filler. It becomes a surface.

Claims (1)

[Claims] 1. A wood-synthetic resin composite characterized in that wood is impregnated with a synthetic resin liquid in which 30% to 70% of a filler is dispersed.