JPH01139206A - Impregnating treating method of wood - Google Patents

Abstract

PURPOSE: To prevent generation of a reverse phenomenon between a spring part and a summer part by previously impregnating a timber with timber modifying agent prior to impregnation of synthetic resin, thereby preventing an increase in transparency of the spring part. CONSTITUTION: The timber is previously impregnated with a timber modifying agent. Since the agent is preferentially injected in a spring part having a thin cell film and large cell cavity in the timber, its injection amount in the spring part is reduced according to the following injection of synthetic resin. As a result, an increase in transparency of the spring part can be prevented. Thus, a reverse phenomenon between the spring part and a summer part is prevented. As the agent, for example, two types of inorganic salts for forming an insoluble inorganic compound in reaction in the timber are used. The timber is impregnated with these salts in the form of water solution, and reacted with one another in the timber. After the timber is impregnated with the agent, insoluble inorganic compound is generated in the timber by drying.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for impregnating wood such as sawn boards.

[Background technology]

Wood has disadvantages such as rotting, burning, and warping, and furthermore, when used for flooring, etc., it is soft and has poor scratch resistance.

In order to eliminate these drawbacks, WPC treatment has been conventionally performed in which wood is impregnated with synthetic resin. However, in ~VPC treatment, when the resin impregnation rate is increased,
Although various physical properties such as hardness are improved, the surface becomes so-called wet color and the woody feel is impaired. In addition, if we look at WPC-treated wood from a microscopic perspective, we can see that a large amount of synthetic resin is press-injected into the spring wood, where the cell membrane is thinner and the cell lumen is larger, while in the summer wood, the cell membrane is thicker and the cell lumen is smaller. contains only a small amount of synthetic resin. For this reason, in such a synthetic resin-impregnated veneer, the transparency is high in the areas where the amount of synthetic resin impregnation is high, so when this is pasted on a base, the spring wood part becomes dark colored and the summer wood part light color due to the effect of the base material. A so-called reversal phenomenon occurs, resulting in an unnatural pattern, especially in the case of veneer with a grain pattern.

[Purpose of the invention]

An object of the present invention is to provide a method for impregnating wood that can eliminate the above-mentioned reversal phenomenon between the spring wood portion and the summer wood portion of wood.

[Disclosure of the invention]

The wood impregnation treatment method of the present invention involves impregnating wood with a wood modifier and treating the wood, and then impregnating the obtained treated wood with a synthetic resin.

That is, according to the present invention, the wood modifier is pre-impregnated into the wood prior to the impregnation treatment with the synthetic resin. Since it is preferentially injected into the spring material portion, the amount of injection into the spring material portion is reduced depending on the subsequent injection of synthetic resin. As a result, the transparency of the spring wood portion can be prevented from increasing, and the occurrence of a reversal phenomenon between the spring wood portion and the summer wood portion is prevented. Furthermore, various properties of wood (hardness, dimensional stability, etc.) can also be improved by impregnating it with a wood modifier.

Examples of the wood modifier include two types of inorganic salts that react in wood to form an insoluble inorganic compound. These inorganic salts are impregnated into wood in the form of an aqueous solution and react with each other in the wood. That is,
One of the two wood modifiers has Mg+ in an aqueous solution.
One generates cation ions such as Ca, AI+Zn+Ba, etc., and the other generates anion ions such as sulfate ion, phosphate ion, carbonate ion, etc. in an aqueous solution. These modifiers are impregnated into wood and then dried to produce inorganic compounds that are insoluble in the wood. The order of impregnation of the two types of modifiers is not particularly limited.

The embodiments of the impregnation treatment in this invention include impregnating both modifiers under pressure, (1) impregnating only the first modifier with pressure, and impregnating the second modifier with reduced pressure or regular impregnation. There are three methods: pressure impregnation; (1) the first modifier is impregnated under reduced pressure or normal pressure; and the second modifier is impregnated under pressure.

Further, examples of the synthetic resin include unsaturated polyester, epoxy resin, urethane resin, acrylic resin, etc., but the resin material is not particularly limited.

Next, the method for impregnating wood according to the present invention will be explained with reference to Examples.

Example 1: A Japanese pine veneer (thickness: 3 m+w) was saturated with water, and then immersed for 4 hours in an aqueous solution in which 4.2 kg of barium chloride and 1.2 kg of porium M were dissolved in 60° C. hot water ION. Then, it was immersed for 10 hours in an aqueous solution in which 10 kg of ammonium hydrogen phosphate and 3.7 kg of boric acid were dissolved in warm water 102 at 60°C. After that, wash with room temperature water for 24 hours,
It was dried using a net dryer until the moisture content became 10% or less.

This treated veneer was placed in a vacuum pressure cooker and heated to 10 Torr or less.
After evacuation for a time, unsaturated polyester resin was injected and impregnated. Then, it was dried at 110 to 120°C and pasted onto plywood coated with an adhesive to form a product.

Example 2: After a rice pine veneer (thickness 2VW) was saturated with water, an aqueous solution of barium chloride/boric acid with the same concentration as in Example 1 was applied to both sides at a rate of 100 to 150 g/rrf.
It was deposited in an atmosphere at 0°C and left for 10 hours. Furthermore, an aqueous solution of ammonium hydrogen phosphate/boric acid having the same concentration as in Example 1 was applied on both sides in the same manner at 150 to 200 g/pot, deposited in an atmosphere of 60 to 70°C, the whole was sealed, and it was left open at 10 o'clock. Then, it was washed with room temperature water for 24 hours and dried with a dryer until the moisture content was 10% or less. Thereafter, the same treatment as in Example 1 was carried out.

In all of the decorative plywood obtained in Example 1.2, the spring wood portion and the summer wood portion that constitute the wood grain on the surface were not reversed, and the plywood had a rich wood texture. It also had excellent properties such as antiseptic properties, flame retardancy, hardness, and dimensional stability.

〔Effect of the invention〕

According to this invention, since the wood modifier is pre-impregnated into the wood prior to the impregnation treatment with the synthetic resin, it is possible to prevent the spring wood from becoming highly transparent due to the resin impregnation. This prevents a reversal phenomenon from occurring between the summer wood and the summer wood. Furthermore, various properties of wood (hardness, dimensional stability, flame retardance, antiseptic properties, etc.) can also be improved by impregnating it with a wood modifier.

Claims (2)

[Claims] (1) A method for impregnating wood, which comprises impregnating wood with a wood modifier and then impregnating the obtained treated wood with a synthetic resin. (2) The method for impregnating wood according to claim (1), wherein the wood modifier is two types of inorganic salts that react in the wood to form an insoluble inorganic compound.