JPS5884708A - Method of treating wood - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a pH-adjusted chlorinated isocyanuric acid bath solution to treat wood with discolored surfaces, wood contaminated with a-bacteria, etc., and to improve craft effects such as wood graining. This article relates to a method for bleaching, sterilizing, and graining wood by subjecting it to the desired wood sound treatment.

The chlorinated cyanuric acid referred to in the present invention includes trichloroisocyanuric acid, dichloroisocyanuric acid, anhydrides and hydrates of alkali metal salts and alkaline earth metal salts of dichloroisocyanuric acid, trichloroisocyanuric acid and dichloroisocyanuric acid. A general term for complexes with acid salts, etc.

In recent years, there has been a rapid increase in the amount of imported wood due to the tightening of domestically produced wood resources, and in conjunction with improvements in wood processing technology, the domestic wood situation has changed significantly.

One of the major changes is that imported wood has a different color quality compared to domestically produced wood, and wood that is sawn overseas is already contaminated with light and bacteria when it is imported and used domestically. It's discolored. In addition, wood such as North American cedar does not closely follow the grain of the wood, and high-end items such as furniture require a treatment to expose the wood grain.

Manufacturers in the two countries have responded to the above trends by using bleaching and sterilization treatments. Conventionally, for bleaching, chlorine-based agents such as secondary sodium hypochlorite and sodium chlorite, and oxidizing agents such as hydrogen peroxide have been used.

Treatment methods using sulfur-based reducing agents, and sterilization.

For preservative treatment, there are chemical treatment methods such as chlorine-based and phenol yarn 2wb-based, and various improvement methods have been carried out. For example, methods of treating wood with chlorite and chlorinated isocyanuric acid or salts thereof are known.

(Publication Publication No. 55-118805) However, in these conventional methods using sodium hypochlorite or sodium chlorite, blackening of wood due to alkalinity, so-called alkali burning, is observed.

During other work, sodium hypochlorite and sodium chlorite are strongly alkaline, so it is very dangerous to come into contact with the skin, and hydrogen peroxide-based products should not come into contact with the skin, as the gas may touch the hair. The color turned red and it didn't look very good. Also, the above public @55-1
In Example 2 of No. 18805, chlorite and dichloroin 7
Using a bleaching solution containing thorium,
The treatment is carried out at 50℃, but at such a low temperature, sodium dichloroisozoanurate decomposes and generates chlorine gas, which is not only undesirable as the amount of available chlorine decreases, but also increases the amount of gas generated. It is toxic and corrosive, making it unsuitable for working environments. The same invention also describes a two-step method in which treatment is carried out with sodium chlorite and chlorinated in-7-anuric acid and its salts, but this method has the drawback of increasing the number of steps.

The present inventor sought an easy-to-use, efficient, cutting-through wood treatment agent that does not have the above-mentioned drawbacks.

This is the result of searching and researching a wide range of methods.

p'8  The treatment process of the chlorinated in/anuric acid solution adjusted to a certain range H is simple, does not cause blackening (alkali burning), and does not damage the wood.

Furthermore, the present invention was completed after discovering that it can be used with peace of mind from the standpoint of safety.

In other words, the method of the present invention uses a chlorinated inanuric acid bath solution whose pH has been adjusted to a certain range. This is a method of treating wood to bleach, sterilize, and level the wood. The chlorinated acid used in the present invention includes trichloroin cyanuric acid and dichloroin/anuric acid.

These include anhydrous and hydrated alkali metal salts and alkaline earth metal metal salts of dichloroin-7-anuric acid, complexes of trichloroin-7-anuric acid and dichloroin/azurate salts, and the like.

Examples of pH adjusters include phosphoric acid, sulfuric acid, carbonic acid, and phosphoric acid such as boric acid, formic acid, acetic acid, and 7-hydric acid.

and sulfuric acid such as citric acid. Chlorinated in 7
As the bath solution for the anuric acid solution, a polar or non-polar so-called Miso bath medium such as acetonate, ethyl acetate, etc., which bath-dissolves the aqueous solution and chlorinated incyanuric acid, and does not decompose the chlorinated incyanuric acid, is used. The convenient form of chlorinated in7-anuric acid contains 111 to 10% by weight, preferably 1 to 5% by weight.
M warehouse%, and the processing temperature is 10 to 45℃, preferably 2
The temperature is 0 to 40°C. Above this temperature, decomposition of the chlorinated in/azuric acid occurs.

Available chlorine is reduced, there is no bleaching blade, and the gas that forms is toxic and corrosive, which is undesirable.Additionally, bleaching takes too long if the temperature is lower than that of the towel, which is undesirable. The pH of the aqueous solution is 6.0 to aO, preferably 5.0 to ZO. As the treatment method, either the dipping method or the coating method, which is commonly used in the bleaching treatment of wood, can be applied. The selection of these conditions will vary depending on the type of wood, the degree of contamination, etc., but among chlorinated acid/azuric acids, the use of a water bath solution of sodium dichlorysone anurate is especially suitable for wood contaminated with rotting fungi and dark brown. Northern sea wood such as Japanese pine wood, South sea wood such as new quinian wood, and precious wood that has changed over time (weathered).

By treating the decorative veneer near room temperature, a preferable degree of whiteness can be obtained, and the depth of the bleached wood grain layer is deeper than that of ordinary sodium hypochlorite, which has not been tested by radar at all. Not detected.

According to the method of the present invention, since the solution has a pH of 5.0 to ZO, the inside of the wood can be treated without damaging the wood (wood is weakly acidic), there is no danger to the worker, and the processing temperature is around room temperature. A simple treatment process provides sufficient bleaching effect,
A bacterial effect and a wood grain effect can be obtained. This treatment temperature is commercially advantageous compared to the conventional method of bleaching with sodium chlorite, which requires heating at 60° C. or higher.

Hereinafter, the present invention will be specifically explained with reference to its implementation.

Example 1 Complete preparation of a 5% aqueous solution of sodium dichloroisosoanurate (available chlorine: 3 [1,000 ppm)].

The pH of this dish was adjusted to 6.0 using phosphoric acid.

This aqueous solution (heated to 11-40°C, and in which the new kinia wood that had been contaminated in the evening box) was placed (length x width x thickness 150j).
uix5 [Full table of wood cut to a size of 1 track x 10M -
It was immersed under the conditions shown in 1. After soaking, the wood surface was washed with water and dried at room temperature, and the bacteria were extracted from the wood surface using Stamphus grade.The color returned after being roasted outdoors for 2 tons and the results are shown in Table 1. Obtained. The whiteness increase rate is a value based on untreated raw material.

Table 1 From the above results, it can be seen that Pli-adjusted dichloroiso/sodium anurate aqueous solution term 41 has anti-scaricidal effect.

Example 2 The sapwood of a Zelkova tree was cut into a size of 300 x 600 x 10 x 9 days, and the sapwood was prepared in the same manner as in Example 1. 1 in a solution (30,000 ppm of chlorine) at 40°C.
After soaking for 00 hours, washing with water and drying at room temperature, the areas other than the wood grains were whitened, the wood grains did not change color, and there was a noticeable # effect.

A beautiful wood grain with an increased three-dimensional effect was obtained.

Comparative Example 1 The Guinea wood used in Example 1 was immersed in a 3% aqueous solution of sodium hypochlorite (this solution had a pH of 1195 and available chlorine [50,0001) pm) l/(, and was treated at 40°C for 2 hours. After washing with water and drying, the surface of the wood grain was observed, and the traces of blue discoloration and bacterial contamination disappeared, but the result was a yellowish bleached finish, which is a phenomenon known as alkali firing.This bleached material was exposed to outdoor heat for 2 tons. When tested, the color had returned to almost the level of the raw material before treatment.Separately, a solution of sodium hypochlorite containing 7 liters of dilute hydrochloric acid was added to adjust the pH to 7.10, and chlorine gas was generated. Decomposition of the effective content occurred.

Comparative Example 2 A water bath solution containing 10% hydrogen peroxide and a po of 10 with caustic solution was heated to 50 to 60°C, and in it was added the same bluish bacteria contamination as used in Example 1. was soaked for 2 hours. After treatment, it was washed with water and dried, and when the entire appearance was observed, it was found to be sufficiently bleached with a whiteness rating of 22.0%.

When I took out a thin layer of stamp sulfate from the wood surface, all bacteria were removed.

Comparative Example 3 25% of dichloroin-sodium anurate in 1 t of water
F,! When sodium chlorate was dissolved in i11.1jl' and its physical properties were measured, the pH was 112° and the available chlorine was 60. It was 0 ppm. This solution was heated to 40° C., and the same Niguinea wood contaminated with blue bacteria as used in Example 1 was immersed for 10 hours. After treatment, it was washed with water and dried, and the overall appearance was observed. The whiteness increase rate was 5.9%, and the result was that the mere combination of sodium yoricycloleisonanurate and sodium chlorite was not superior at all. My friend who couldn't find any effect.

Percentage applicant: Nissan Chemical Industries, Ltd. -11 completed- 32-

Claims (1)

[Claims] Sterilization of wood by treatment with a chlorinated inanuric acid solution in which the kpH of the wood is adjusted. A method of treating wood that is characterized by bleaching and graining.