JPH0583672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dyeing process useful for coloring silk using noble metal salts and reducing agents.

[Conventional technology]

Because precious metals such as gold and silver are rare and expensive,
Items using this material have been considered luxury items since ancient times. Extremely fine particles of precious metals have strong coloring power; for example, fine gold particles obtained by reduction with stannous salts are called ``Cassius Purple'' and are used to color ceramics and glass. On the other hand, silk is also called the queen of fibers and is essential for high-end textile products, and if this silk could be dyed using fine metal particles, it would be possible to further enhance the sense of luxury.

A product in which such noble metal fine particles are uniformly dispersed in water is called a noble metal hydrosol, and the noble metal fine particles that constitute this are called a noble metal colloid. The inventors previously discovered a method for dyeing textile moldings such as silk cloth in a purple color by using a gold hydrosol containing a cationic surfactant and adsorbing the gold colloid contained therein. . (Unexamined Japanese Patent Publication 1986-
299587).

[Problem to be solved by the invention]

However, in this method, if the amount of adsorbed gold colloid exceeds 0.5% of the weight of the fiber molded product, the aggregation between the gold particles becomes severe, and as a result, the color does not become any darker, and the color becomes blackish and dull. Become. Furthermore, since the gold fine particles are distributed only on the fiber surface, they are likely to fall off due to friction, especially in a wet state. The present invention
The object of the present invention is to provide a new dyeing method that solves the drawbacks of conventional methods such as difficulty in dyeing deep colors and poor friction fastness.

[Means to solve the problem]

The inventors of the present invention have conducted intensive research in search of a dyeing method that can dye silk in deep colors without using precious metal colloids and has excellent fastness against friction. The present inventors have discovered that such dyeing is possible by sequentially treating the fibers to form noble metal fine particles inside the fibers, and have accomplished the present invention.

That is, the present invention provides a silk dyeing method characterized by impregnating silk fibers with a noble metal salt solution and then treating the silk fibers with a reducing agent to form noble metal fine particles inside the silk fibers to develop color. It is.

Examples of the noble metal salts used in the method of the present invention include water-soluble noble metal salts such as chloroauric acid, sodium chloroaurate, silver nitrate, palladium chloride, chloroplatinic acid, and rhodium chloride.

Examples of the reducing agent used in the method of the present invention include water-soluble reducing agents such as sodium borohydride, dimethylamine borane, hydrazine hydrate, sodium ascorbate, and sodium citrate.

To carry out the present invention, first, silk thread or silk cloth is immersed in an aqueous noble metal salt solution to transfer the noble metal salt into the inside of the silk fibers. The concentration of noble metal salt in aqueous solution is 10
~100 mmol/1, and the immersion time is selected within the range of 10 seconds to 10 hours. The immersion temperature is selected within the range of 0 to 100°C, but usually room temperature is sufficient. The higher the concentration of noble metal salts in the aqueous solution, the higher the immersion temperature.
In addition, the longer the soaking time, the more noble metal salts move into the inside of the silk fibers, and the dyed color becomes darker after reduction. After the silk thread (cloth) is immersed in the noble metal salt aqueous solution in this way, it is moved to the reduction treatment.
Before that, the silk fibers may be treated with an alkali to convert the noble metal salts that have moved inside the silk fibers into hydroxides. For alkaline treatment, a weak alkaline aqueous solution such as sodium carbonate or ammonia is used.

The reduction treatment is performed by immersing the silk thread (cloth) in an aqueous noble metal salt solution for a predetermined period of time, then pulling it out, washing it with water, and immersing it in an aqueous solution of a reducing agent. Here, the noble metal salt inside the silk fiber is reduced by the reducing agent to form noble metal fine particles, and as a result, the silk fiber is colored brown, gray, purple, yellowish brown, or dark brown. This is washed with water and dried to complete the dyeing of the silk thread (cloth).

The color of the finished dye varies depending on the type of noble metal salt and reducing agent used. For example, in the case of gold salt, reduction with sodium borohydride produces a brown color, reduction with dimethylamine borane produces a purple color, and reduction with hydrazine produces a brown color. The color is grayish, and silver salts give a yellowish color regardless of the reducing agent, and palladium salts, platinum salts, etc. give a brownish color. If alkali treatment is performed prior to reduction treatment, such as when using hydrazine, the color may be different from that without alkali treatment.

In the method of the present invention, the noble metal salt treatment or reduction treatment of the silk fabric does not necessarily need to be carried out in an aqueous solution, and may be carried out, for example, by applying a noble metal salt or a reducing agent dissolved in glue. By combining this with traditional textile printing techniques, it is possible to dye only specific parts of silk cloth or draw patterns on it.
In addition, it is also possible to dye silk fabric in a certain pattern using tie-dyeing techniques and resist dyeing paste.

Examples Next, the present invention will be explained in more detail using examples.

Example 1 A 4 cm x 4 cm 14 momme plain-woven silk cloth (Japanese Standards Association, attached white cloth for dye fastness test) was immersed in a 20 mmol/1 sodium chloraurate aqueous solution for 10 minutes at room temperature. This was taken up, washed with water, and then immersed in an 80 mmol/1 aqueous sodium borohydride solution for 10 minutes, causing foaming and coloring the silk cloth to a deep brown color. This is then washed with water and dried,
A dark brown colored silk fabric was obtained.

Example 2 A silk cloth similar to that used in Example 1 was prepared at room temperature.
It was immersed in a 20 mmol/1 chloroauric acid aqueous solution for 10 minutes. After pulling it up and washing it with water, let it stand at room temperature.
In 80 mmol/1 dimethylamine borane aqueous solution
After soaking for 10 minutes, it was washed with water and dried to obtain a silk cloth colored deep purple.

Example 3 A silk cloth similar to that used in Example 1 was prepared at room temperature.
It was immersed in a 20 mmol/1 aqueous solution of oxidized gold acid for 10 minutes. After pulling it up and washing it with water, let it stand at room temperature.
After being immersed in an 80 mmol/1 aqueous solution of hydrazine hydrate for 10 minutes, it was washed with water and dried to obtain a silk cloth colored black and gray.

Example 4 A silk cloth similar to that used in Example 1 was prepared at room temperature.
It was immersed in a 20 mmol/1 silver nitrate aqueous solution for 10 minutes.
After taking it out and washing it with water, it was heated to 80 mmol/
After being immersed in the sodium borohydride aqueous solution of No. 1 for 10 minutes, it was washed with water and dried to obtain a yellowish brown colored silk fabric.

Example 5 Palladium chloride was dissolved in water at a concentration of 20 mmol/1 along with 20 molar amounts of ammonia, and a silk cloth similar to that used in Example 1 was immersed in this solution for 10 minutes at room temperature. After pulling it up and washing it with water, let it stand at room temperature.
After immersing in 80 mmol/1 sodium borohydride aqueous solution for 10 minutes, washing with water and drying, a dark brown colored silk fabric was obtained.

Example 6 Silk cloth similar to that used in Example 1 was heated at room temperature.
It was immersed in a 20 mmol/1 chloroplatinic acid aqueous solution for 10 minutes. After pulling it up and washing it with water, let it stand at room temperature.
In 80 mmol/1 dimethylamine borane aqueous solution
After soaking for 10 minutes, the cloth was washed with water and dried to obtain a gray-brown colored silk cloth.

Example 7 A silk cloth similar to that used in Example 1 was prepared at room temperature.
Immerse in 20 mmol/1 chloroauric acid aqueous solution for 10 minutes,
After pulling it up and washing it with water, let it stand at room temperature.
It was immersed in a 200 mmol/1 aqueous sodium carbonate solution for 10 minutes. Furthermore, after washing with water, 80 mmol/1
The cloth was immersed in an aqueous solution of hydrazine hydrate for 10 minutes, washed with water, and dried to obtain a silk cloth colored deep purple.

Example 8 Using a glue obtained by dissolving dimethylamine borane in 100 times the weight of starch glue (Yamato paste, manufactured by Yamato Co., Ltd.), a certain amount was applied to a silk cloth that had been treated with chloroauric acid and dried in the same manner as in Example 2. I drew a pattern. At this time, the patterned portion immediately became colored deep purple. After drying, it was immersed in a photographic fixer (Fuji Fixtures) for about 10 minutes to dissolve and remove the chloroauric acid in areas other than the pattern, and then thoroughly washed with water to remove the glue, then dried. A white cloth with a dark purple pattern was obtained.

Example 9 Starch paste (manufactured by Yamato Co., Ltd., manufactured by Yamato Co., Ltd.,
A certain pattern was drawn on a silk cloth similar to that used in Example 1 using a paste obtained by dissolving it in Yamato paste. After 10 minutes, wash thoroughly with water to remove the glue, then store at room temperature.
In 80 mmol/1 dimethylamine borane aqueous solution
Soaked for 10 minutes. During this time, the patterned area became colored a deep yellowish brown. This was washed with water and dried to obtain a white silk cloth with a dark tan pattern.

〔Effect of the invention〕

Colored silk thread (cloth) obtained by the method of the present invention
contains fine gold particles only inside the fibers, so they all maintain the original texture of silk and exhibit a sophisticated color, which can also be made into a dark color.
These colors do not come off due to friction, and will not change color or fade even if left in a bright place for a long time. Products made using dyed silk thread (cloth) have the luxury of the silk itself, with the added value of having been dyed using rare precious metals, which has the effect of further enhancing the image of a luxury product.

Claims (1)

[Claims] 1. A method for dyeing silk, which comprises impregnating silk fibers with a noble metal salt solution and then treating the silk fibers with a reducing agent to form noble metal fine particles inside the silk fibers to develop color.