JPS6152773B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for dyeing wood.
More specifically, the present invention relates to a method for dyeing ebony and wood for imitation wood. Both ebony and iron sword wood are timbers produced in the tropics; ebony is a purplish-black color, and iron sword wood is a purple-reddish brown color, and most of these have beautiful grains; , because the material is hard, furniture,
It is prized as a material for decorative items in Japan and Uchimai. Particularly in Japan, these woods have been called karaki and prized since ancient times. However, since these woods are natural materials whose supply is limited, in recent years there has been a trend in the southern countries of their origin to generally restrict their export as materials. For this reason, in order to ensure a stable supply of alternative materials, the processing industry in Japan, which has traditionally used these karaki as materials, dyes easily available hard miscellaneous woods in the color of the above karaki. It has become desirable to create simulant materials and use them as substitutes for them. For this purpose, in Japan, a method has been proposed in which the above-mentioned dummy wood is made by applying vegetable pigments such as Asen, Soho, or Rotsugutsudo to miscellaneous hardwood along with mordants such as iron and chromium compounds. Since these vegetable pigments are natural products, they contain many impurities, their purity is not constant each time they are obtained, and there are also difficulties in their stable supply. Moreover, because of its large molecular weight, it is almost impossible to penetrate and dye the inner layer of miscellaneous hardwood, and it is difficult to say that it is a modern industrial dyeing method. In view of these circumstances, as a result of intensive research, the inventor of the present application has developed a method for producing miscellaneous hardwoods with a high tannin content using iron salts, ammonia or ammonium compounds, and one or more compounds selected from the following compound group. It has been discovered that if these hardwoods are dyed, the grain of the wood will be darker and the other parts will be lighter, and even the inner layer will be dyed to a purplish-black or purplish-reddish brown similar to the above-mentioned Japanese karaki. Compound group 2,6-dihydroxypyridine or its salt,
Gallic acid, pyrogalic acid, catechol To dye wood, use basic dyes, acid dyes, direct dyes, disperse dyes, vat dyes, oil-soluble dyes, mordant dyes, vegetable dyes, animal dyes, and reactive dyes. Various dyes such as sex dyes and oxidative dyes are used. However, if you dye miscellaneous hardwood using these dyes, you can dye it to the color of the above-mentioned karaki, but
It is difficult to express the remarkable grain pattern that the above-mentioned wood generally has on the dyed mixed hardwood. This is because the various hardwoods that have been stained are pale yellow,
It has an orange, brown, or red grain pattern,
The color of these wood grain patterns is overwhelmed and disappears due to the dark tones of the red, brown, or black wood dyes used when the hardwood is dyed, and the grain of the hardwood is unclear after dyeing. It is to become. Therefore, the inventor of the present application first investigated a dyeing method that selectively and intensely dyes the grains of various hardwoods to be dyed. Wood grain refers to the latewood parts of annual rings that appear in the cross section of wood, duct grooves, medullary rays, etc. As a result of investigation, it was found that these areas contain more tannin than other parts of the wood. First, the wood grain was dyed dark blue by reacting the tannins in the wood grain with iron salts to produce a dark blue pigment. Next, in order to change the dark blue color of the wood grain to a color unique to Karaki wood, various aromatic polyhydroxy compounds are further reacted with the tannins of the grain in the presence of ammonia or ammonium salts to create the Karaki-colored pigment. It was made on wood grain, and the dark blue color of the wood grain was changed to a color unique to dark karaki wood. At this time, it goes without saying that the grain of the wood will be darkly dyed to a dark wood color, which is close to black, but since there is a small amount of tannin in the areas other than the wood grain of the miscellaneous hardwood being dyed, those areas will also be dyed pale due to the iron content. It was dyed dark blue, and this light navy blue was further changed to a pale arabic color due to the above-mentioned aromatic polyhydroxy compound, and a technique was established to dye the miscellaneous hardwood to a dark arabic color that exposed the grain of the wood. The present invention has been completed. In the technology of the present invention, it is known that tannins and iron react to create dark blue pigments, and tannins and various penzene-based aromatic polyhydroxy compounds react in the presence of ammonia to create various brown colors. It is also known to make pigment-based pigments. In the latter case, for example, it is known that the reaction of tannin and pyrogalic acid in the presence of ammonia produces a brown color, and the reaction of catechol under the same conditions produces a dark brown pigment. However, an important component of the present invention is that when these former and latter known facts are combined, an unexpected non-additive result suddenly occurs. In other words, if a brown pigment produced by the reaction of tannin and a benzene-based aromatic polyhydroxy compound in the presence of ammonia is added to the dark blue pigment produced by the reaction of tannin and iron, it becomes green from a chromatic perspective. Although it was expected that a black color would be developed, the result was contrary to this expectation, and a purplish reddish-brown color was developed, and furthermore, instead of a benzene-based aromatic polyhydroxy compound, a pyridine-based aromatic polyhydroxy compound was used. With the compound, a purplish-black hue is developed. These facts are new facts that have not been reported in any literature, and were discovered for the first time by the inventor of the present application.
The hardwoods with a high tannin content that can be used in the present invention include oaks, chestnuts, oaks, oaks, oaks, vertebrates, etc., and the iron content includes ferrous sulfate and ferric chloride. Examples of aromatic polyhydroxy compounds include gallic acid, pyrogallic acid, catechol, 2,6-dihydroxypyridine or its salts, and ammonium salts include ammonium bicarbonate and carbonic acid. Ammonium and the like are preferably used. The present invention does not use vegetable natural colors that are unstable in terms of quality and supply, and can easily expose the wood grain of miscellaneous hardwood at room temperature. The present invention provides a dyeing agent capable of dyeing even the inner layer of ebony (black ebony wood color) and purplish reddish brown (sword wood color), and is extremely meaningful from an industrial perspective. The present invention will be specifically explained below with reference to Examples, but the present invention is not limited to these Examples unless the gist thereof is taken into consideration. Example 1 Oak wood with a surface area of 460 cm ² (thickness 1.0 mm) was coated with 22 c.c. of a 0.11% ferrous sulfate aqueous solution, and then 30 c.c. of a 0.1% 2,6-dihydroxypyridine hemisulfate aqueous solution was applied.
cc on this, and then add 10% of a commercially available ammonium carbonate (30% ammonia content) aqueous solution with a concentration of 0.4%.
When CC is applied to this and dried at room temperature, the pith line of the wood becomes deep purple-black, and the other parts turn purple-black, and the oak wood is made of ebony wood, which is highly water-resistant, alcohol-resistant, and oil-resistant. It can be dyed in colors like colors. Example 2 A white oak material with a surface area of 460 cm ² (thickness 1.0 mm) was
Apply 22c.c. of 0.11% ferrous sulfate aqueous solution, then
Apply 0.1% catechol aqueous solution 21c.c., and then apply 0.4% catechol aqueous solution.
% commercial ammonium carbonate (ammonia content 30
If you apply 5 c.c. of an aqueous solution to this and dry it at room temperature, the conduit grooves and latewood parts of the annual rings will turn dark purple-black, and the other parts will turn purple-black. Even the inside is dyed in a color similar to that of striped ebony, which is water, alcohol, and oil resistant. Examples 3 and 4 In the formulation shown in Example 2, a concentration of 0.1%
If you use the following benzene-based polyhydroxy compound in the amount shown below instead of the catechol aqueous solution 21c.c., the following results will be obtained, and the white oak wood will be highly water-resistant, alcohol-resistant, and oil-resistant to the inside. It is dyed in a color similar to iron sword wood.

[Table] Reference example 1 In Example 1, only ferrous sulfate was allowed to act on oak wood, and ammonium carbonate and aromatic polyhydroxy compound (i.e., 2,6-dihydroxypyridine hemisulfate) were not allowed to act on oak wood. , the oak is dyed a vivid, artificial dark blue. Reference Example 2 In Example 1, if only ferrous sulfate and ammonium carbonate were allowed to act on the oak wood, but no aromatic polyhydroxy compound (i.e. 2,6-dihydroxypyridine hemi-sulfate) was allowed to act on the oak wood, the oak wood is dyed a vivid, artificial purple color.

Claims (1)

[Claims] 1. Dyeing of wood characterized by applying an iron salt to wood, and then applying one or more of 2,6-dihydroxypyridine or its salt, gallic acid, pyrogalic acid, or catechol, and ammonia or an ammonium compound. Method.