JPH01190403A - Method for impregnation of lumber - Google Patents

Abstract

PURPOSE:To enable the material property of hardness or the like to be improved and prevent the lowering of woody feeling by impregnating resin and then infiltrating a lumber reforming agent having a hardening acceleration function into the lumber. CONSTITUTION:As a resin, a water soluble resin such as, for instance, melamine resin or the like easy to handle is infiltrated into the lumber, and then the lumber reforming agent made up of two kinds of inorganic salt forming a insoluble compound in reacting each other is infiltrated, for instance, as a lumber reforming agent. In the inorganic salt, one produces cation such as Mg, Al, Zn, Ba and the like in water solution, and the other produces anion such as sulphate ion, phosphoric ion, carbonic ion and the like in water solution. Thus, the properties of rot-proof, fire-proof and the like of the lumber are improved, furthermore, the hardening of the resin can quickly be performed and the material property by the resin is improved as well as the damage of woody feeling owing to the lowering of resin impregnation quantity can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for impregnating wood such as wood veneers and sawn boards.

[Conventional technology]

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

In order to eliminate these drawbacks, WPC treatment, which impregnates synthetic resin into wood, has been conventionally performed.

[Problem to be solved by the invention]

In WPC treatment, increasing the resin impregnation rate improves various physical properties such as hardness, but on the other hand, the surface becomes so-called wet color.
It had the disadvantage of damaging the wood texture.

Therefore, an object of the present invention is to provide a method for impregnating wood that can obtain wood with excellent physical properties.

[Means to solve the problem]

The method for impregnating wood according to the present invention involves impregnating wood with a resin, then impregnating the wood with a wood modifier having a function of accelerating hardening of the resin, and curing the resin.

Examples of the resin include water-soluble resins such as melamine resins that are easy to handle.

Furthermore, examples of the wood modifier include wood modifiers consisting of two types of inorganic salts that react with each other to form an insoluble compound.

One of the two types of inorganic salts is Mg in an aqueous solution.

One generates cation ions such as Ca, , Atl 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 in the form of an aqueous solution, and upon drying produce inorganic compounds that are insoluble in the wood. The order of impregnation of the two types of modifiers is not particularly limited.

As the impregnation method in this invention, any of pressurized impregnation, reduced pressure impregnation, and normal pressure impregnation can be adopted.

After the impregnation treatment with both modifiers, the treated wood is dried so that these modifiers react in the wood to form insoluble inorganic compounds.

[Effect]

By impregnating wood with the wood modifier, the performance of the wood, such as its antiseptic properties and flame retardancy, is improved. Furthermore, since this wood modifier also functions as a resin curing accelerator, the resin is quickly cured, production efficiency is increased, and the physical properties of the resin (hardness, strength, dimensional stability) are improved. When used in combination with a wood modifier, only a small amount of resin is required to be impregnated, so it is possible to prevent the surface from becoming wet and discolored.

(Example) Next, the method for impregnating wood of the present invention will be explained with reference to Examples.

Example 1: A Japanese pine veneer (thickness IO Ilm) was placed in a vacuum pot and left under reduced pressure (evacuation below 10 Torr for 1 hour or more). Melamine resin (solid content: 50%), which is a water-soluble resin, was then injected and impregnated into the wood.

After resin impregnation, barium chloride 4.2 kg per 10ffi
and 60°C in warm water containing 1.2 kg of boric acid.
Soaked for an hour. Then, 10 kg of ammonium phosphate and 3.7 kg of boric acid were added per 10ffi.
"C" warm water for 24 hours.

After immersion, the sample was immersed in room temperature water for 24 hours to remove soluble salts. Then, it was dried and cured at 100 to 120°C to obtain a modified wood.

Example 2: Modified wood was obtained in the same manner as in Example 1 using oak veneer (thickness: 1511 m). However, the resin solid content was 30%.

5. In these Examples, the inorganic salt was impregnated into the wood veneer. The pH in the wood is lower (pH 3-4), and the curing speed of the melamine resin is faster, and what conventionally required 5-6 hours was now able to be cured in 2-3 hours. In addition, properties such as hardness, strength, and dimensional stability based on the melamine resin have been improved, and performances such as antiseptic properties and flame retardancy have also been improved by impregnation with inorganic salts. Furthermore, the surface did not become wet and colored.

〔Effect of the invention〕

According to this invention, by impregnating wood with a wood modifier, the performance of the wood, such as its antiseptic properties and flame retardance, is improved. Furthermore, this wood modifier also functions as a resin curing accelerator, so the resin hardens quickly, improving the physical properties of the resin (hardness, strength, dimensional stability), and improving the resin's wood modification properties. Since it is used in combination with a resin, the amount of resin impregnated is reduced and the surface becomes wet and the wood texture is prevented from being damaged.

Claims (1)

[Claims] A method for impregnating wood, comprising impregnating wood with a resin, then impregnating the wood with a wood modifier having a function of accelerating hardening of the resin, and curing the resin.