JPS6346193B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dyeing method useful for coloring fiber molded articles using a gold hydrosol containing a cationic surfactant.

Conventional Technology Since gold is rare and expensive, items made with it have been considered luxury items since ancient times. An extremely fine particle of gold uniformly dispersed in water is called a gold hydrosol, and the fine gold particles that make up this are called a gold colloid. Gold hydrosol is generally a red and transparent liquid, but when the gold colloid contained therein is adsorbed to a solid, it has the property of coloring the surface purple, which is known as ``Cassius'purple''. . If such a gold hydrosol could be used to dye cloth for clothing, it would give gold a luxurious image and increase its value, but such a dyeing method has not been established to date.

Means for Solving the Problems The present inventors have conducted extensive research in search of a fabric dyeing method using gold hydrosol, and have found that when using gold hydrosol containing a cationic surfactant, this It was discovered that the gold colloid contained therein was strongly adsorbed to the fiber surface and colored fiber molded articles such as cloth, leading to the present invention.

That is, the present invention is a method for dyeing a fiber molded article, which is characterized by immersing the fiber molded article in a gold hydrosol containing a cationic surfactant and adsorbing the gold colloid in the gold hydrosol onto the fiber surface. The present invention provides a method.

In the method of the invention, a gold hydrosol containing a cationic surfactant is used. As this cationic surfactant, quaternary ammonium salt type water-soluble surfactants such as stearyltrimethylammonium chloride and cetylpyridinium chloride are suitable, and the concentration in the gold hydrosol is
It is used in a range of 0.001 to 1% by weight. Gold hydrosol is obtained by the conventional method of using chloroauric acid as a raw material and treating its aqueous solution with a water-soluble reducing agent such as sodium borohydride or sodium citrate.
A cationic surfactant is added before or after this reduction treatment. (For example, published patent publication Sho
59−120249) Gold concentration in gold hydrosol is 0.001~
A range of 0.1% by weight is preferable. Here, the gold colloid in the gold hydrosol containing a cationic surfactant is positively charged, while the fiber surface tends to be negatively charged. is adsorbed to. In gold hydrosols containing water-soluble polymers such as polyvinylpyrrolidone or nonionic surfactants such as polyethylene glycol mono-p-nonylphenyl ether, all of the gold colloids contained therein are negatively charged, so fibers However, a cationic surfactant added to the colloid can be used in the method of the present invention because the charge of the colloid is converted to positive.

To carry out the method of the invention, the fiber moldings are immersed in a gold hydrosol for a certain period of time, then taken out, washed with water, and dried. In this way, the fiber moldings are colored in a purple or red family of colors. The immersion time in the gold hydrosol is selected from several minutes to several days; if the immersion time is short, the fiber molded product will be colored in a light color, and if it is immersed in the gold hydrosol for a long time, it will be colored in a deep or dark color. The color also changes depending on the ratio of surfactant to gold; if there is a lot of surfactant to gold, the color will be light and reddish-purple, and if there is little, it will be dark or dark blue. It is colored purple with a tinge of . Furthermore, in the case of very fine gold colloids, they are colored. The temperature of the gold hydrosol during dipping is selected within the range of 0 to 100° C. The dipping time can be shortened as the temperature increases, but usually room temperature is sufficient.

The fiber molded articles to which the method of the present invention is applied include woven fabrics, knitted fabrics, nonwoven fabrics whose constituent fibers are silk, cotton, wool, rayon, acetate, nylon, and polyester;
Paper and thread. Among these, wool, acetate, and polyester are preferably treated with an alkali such as an aqueous sodium hydroxide solution in advance.

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

Example 1 50mg of cetylpyridinium chloride was added to 92.5ml of pure water.
ml, add 5 ml of an aqueous solution of 200 μmol of sodium borohydride under stirring, and then add chloroauric acid.
A dark red transparent gold hydrosol was obtained by injecting 2.5 ml of a 50 μmol aqueous solution. 4cm in this gold hydrosol
A plain-woven silk cloth (according to JIS L0803, attached white cloth for dye fastness test) of 4 cm was soaked for 20 hours, then pulled out, washed with water, dried, and colored silk cloth was obtained.

Example 2 50 μmol of chloroauric acid was dissolved in 94 ml of pure water, 1 ml of an aqueous solution of 10 mg of stearyltrimethylammonium chloride was added while stirring, and then 5 ml of an aqueous solution of 200 μmol of sodium borohydride was injected.
A red transparent gold hydrosol was obtained. A silk cloth similar to that used in Example 1 was immersed in this for 1 hour, washed with water, and dried to obtain a silk cloth colored pale purple.

Example 3 4cm x 4cm plain weave polyester cloth (JIS
Compliant with L0803, attached white cloth for dye fastness test) 80
After being immersed in a 6M aqueous sodium hydroxide solution at ℃ for 10 minutes, it was thoroughly washed with water. This cloth was immersed in the same gold hydrosol as used in Example 2 for 1 hour, then taken out, washed with water, and dried to obtain a polyester cloth colored pale red.

Example 4 1 ml of an aqueous solution of 10 mg of stearyltrimethylammonium chloride was added to a red transparent gold hydrosol obtained by the same procedure as in Example 2 except that polyvinylpyrrolidone (polymerization degree 360) was used instead of stearyltrimethylammonium chloride. A silk cloth similar to that used in Example 1 was immersed in this gold hydrosol for 20 hours, washed with water, and dried to obtain a silk cloth colored dark reddish-purple.

Effects of the Invention The colored fiber molded product obtained by the method of the present invention exhibits a magnificent color and does not change color even if left in a bright place for a long period of time. Furthermore, silk fabrics are inherently expensive, and the fact that they are dyed using rare gold in purple, a color that has traditionally been associated with nobility, further enhances their image as luxury goods.

Claims (1)

[Claims] 1. A dyeing method characterized by immersing a fiber molded article in a gold hydrosol containing a cationic surfactant.