JPH0699871B2 - Method for dyeing animal hair fiber - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for dyeing animal hair fibers.

[0002]

2. Description of the Related Art Heretofore, as a dyeing method of this kind, for example, a method of dyeing fibers into red, purple and brown by using a gold hydrosol has been developed. This method involves preparing an aqueous solution of gold ions, reducing the aqueous solution with a reducing agent to produce fine gold particles, and stabilizing the fine gold particles as a hydrosol using a cationic surfactant. It is an attempt to immerse fibers in a hydrosol and to adsorb the sol-shaped fine gold particles to the fibers in the form of particles to dye the particles. (For example, JP-A-63-46193)

[0003]

According to the technique described above, when dyeing silk, nylon or the like, it was easy to penetrate the fine metal particles into these fibers, but animal fibers such as wool do not Since the surface of the fiber has a surface with poor permeability for the fine metal particles, the fine metal particles do not easily penetrate into the fiber and are difficult to be adsorbed. It was necessary to carry out a pretreatment for improving the water absorbability, such as peeling or scratching the surface portion having poor permeability by treatment with an alkaline aqueous solution.

An object of the present invention is to provide a dyeing method in which fine metal particles can be easily permeated into the inside of animal hair fibers and carried therein.

[0005]

Means for Solving the Problems Animal hair fibers have a reducing ability to various metal ions (hereinafter, this reducing ability is referred to as a latent reducing power), and the present invention uses this latent reducing power. It was done by.

The characteristic means of the method for dyeing animal hair fibers of the present invention is to prepare an aqueous solution in which a metal to be supported is ionized, and immerse the animal hair fiber in the aqueous solution to add the metal ions to the animal. After permeating into the hair fibers, the animal hair fibers are washed with water and dried.
It is as follows.

[0007]

In other words, by immersing animal hair fibers in an aqueous metal ionized solution, the metal ions are much smaller than the fine metal particles. Both can easily penetrate into the inside of the fiber, and the metal ions that have penetrated into the animal hair fiber are reduced inside the fiber due to the latent reducing power of the animal hair fiber itself and become metal fine particles. , A stronger and more stable adsorption state. Therefore, dyeing can be performed by supporting metal fine particles on animal hair fibers without stabilizing treatment with a surfactant.

[0008]

Therefore, when dyeing by this method, there is no need for conventional pretreatment with an alkaline aqueous solution for surface treatment of wool and treatment with a reducing agent or a surfactant for treating metal sol. Therefore, the labor and material cost for dyeing can be reduced, and the cost can be reduced. Further, in adsorbing the metal fine particles to the fiber, in the conventional method using a hydrosol, in order to stably disperse the hydrosol as a sol, a limited condition that can be stabilized by using a surfactant is used. Although it could only be dyed, the use of the method of directly adsorbing metal ions on the fiber of the present invention makes it easy to stabilize the metal fine particles, so that the kind of metal used, the metal ion concentration of the solution, The selectable range of pH, adsorption time, etc. is widened, which enables dyeing in a wide range of colors.For example, when metal is gold, it changes from reddish purple to reddish brown or even golden, and when silver, it changes from yellow to gray. Can be dyed to produce colors that could not be expressed in the past. Further, since the metal fine particles can be supported in the fiber, wrinkle resistance, dimensional stability, conductivity, flame retardancy, insect resistance,
Many functions such as antibacterial properties can be stably added at the same time.

[0009]

EXAMPLE Recently, wool has a reducing power, for example, [Chemicals and Industry, vol. 41, p1042, (198
As shown in 8)], it can be seen from the fact that methylene blue undergoes a reducing action by wool to become its leuco body and undergoes decolorization, and the substance that exhibits a reducing / oxidizing action is contained in the cell membrane complex of the wool fiber. It is shown that

[0010] Furthermore, as shown in [Fibrous Society 62th Annual Meeting Summary, p193 (1987)], oxidation of leuconaphthazarine by wool and concomitant reduction of wool by leuconaphthazarine may occur. It is shown.

In both cases, wool has a reducing / oxidizing action,
This mechanism has been shown to involve disulfide groups and metals in wool. The existence of the reducing / oxidizing power of wool is expected in animal hair fibers in general.

Furthermore, as can be seen from the fact that decolorization of methylene blue occurs even when thioglycolic acid is used instead of keratin-based protein, wool is treated with various reducing agents.
By utilizing the fact that the disulfide group is reduced to a thiol group by the reduction treatment, it is expected that the latent reducing power of wool is further enhanced.

Next, various concrete experimental examples will be shown below. [Experimental Example 1] An example is shown in which wool is dyed with gold. 0.03-0.3 wt% chloroauric acid (HAuCl
₄ ) Immerse the wool cloth in the aqueous solution at room temperature for 10 hours (bath ratio 1:50). Then, it is washed with water to remove the excessively penetrated chloroauric acid and dried at room temperature. The color tone of the obtained wool differs depending on the concentration of chloroauric acid, and it is bluish purple at a low concentration and bluish brown at a high concentration.

[Experimental Example 2] Next, an experimental example having different adsorption times and temperatures will be described. A wool cloth is immersed in an aqueous 0.03-0.3 wt% chloroauric acid solution at room temperature for 5 hours. (Bath ratio 1: 5
0). After that, the solution is heated to 90 ° C., immersed for 30 minutes, washed with water and dried at room temperature as in Experimental Example 1. The color tone of the wool obtained in this way also depends on the concentration of chloroauric acid, and it becomes bluish brown at low concentrations and golden at high concentrations.

[Experimental Example 3] Next, an experimental example in which the pH is different under the adsorption condition is shown. A wool cloth was added to a 0.1 wt% aqueous chloroauric acid solution adjusted to pH 3.0 to 9.0 at room temperature for 10 hours.
Immerse for a time (bath ratio 1:50). After that, it is washed with water and dried at room temperature in the same manner as in Experimental Example 1. The color of the wool obtained is p
Depending on H, it becomes bluish brown at low pH and reddish brown at high pH.

[Experimental Example 4] Furthermore, a dyeing method using a fiber having a reducing power enhanced by using a reducing agent will be described. For example, when using sodium borohydride (NaBH ₄ ),
After soaking the woolen cloth in a 1-0.5% aqueous solution for 30 minutes at room temperature, wash it with water to remove the excessive penetrating reducing agent,
Dry well at room temperature. When the woolen cloth thus obtained is dyed by the method of the previous example, the color tone of the resulting wool is the dipping time,
Depending on the temperature, concentration, and pH, for example, in the method of Experimental Example 1, low concentration produces reddish purple, and high concentration produces reddish brown.

[Experimental Example 5] The handling of a reducing agent when another reducing agent is used will also be described. When ethylene thioglycol (HOCH ₂ CH ₂ SH) is used, wool cloth fibers are immersed in a 1 to 4 mol urea aqueous solution containing 1 to 5% ethylenethioglycol at room temperature for 2 hours at pH 9.7. The reducing power of is strengthened. Further, when sodium dithionite (Na ₂ S ₂ O ₄ ) is used, it is used in a 0.5 to 1.0% aqueous solution.
Immersion conditions at 0 ° C. for 45 minutes enhance the reducing power of the woolen fiber. In both cases, the same effect as when using sodium borohydride is obtained.

[Experimental Example 6] Further, a method of carrying metal ions on animal hair fibers and then treating with a reducing agent will be described. Wool is immersed in an aqueous 0.03-0.3 wt% chloroauric acid solution adjusted to pH 4 for 30 minutes at room temperature (bath ratio 1:50). After that, in order to remove the chloroauric acid aqueous solution which is excessively dipped in the wool, it is washed with water and then dried at room temperature. The wool is further immersed in a 1% aqueous solution of sodium dithionite at 60 ° C. for 45 minutes. When the wool thus obtained is further washed with water and dried, the color tone obtained varies depending on the concentration of chloroauric acid, and becomes reddish purple at a low concentration and bluish purple at a high concentration. [Experimental Example 7] Furthermore, when another fiber, another metal, another immersion condition, or another reducing agent is used,
It is possible to individually select conditions under which gold ions are reduced and stably adsorbed in the fiber, and it is possible to easily dye various colors.

Claims (3)

[Claims] 1. A method for dyeing animal hair fibers in which metal fine particles are carried on animal hair fibers, wherein an aqueous solution in which a metal to be carried is ionized is prepared, and the animal hair fibers are immersed in the aqueous solution. A method for dyeing animal hair fibers, which comprises infiltrating the animal hair fibers with the metal ions and then washing the animal hair fibers with water and drying. 2. The method for dyeing animal hair fibers according to claim 1, wherein the animal hair fibers are previously subjected to a reduction treatment with a reducing agent before the animal hair fibers are immersed in the aqueous solution. 3. After the animal hair fiber is immersed in the aqueous solution, the animal hair fiber is further reduced with a reducing agent.
The method for dyeing animal hair fibers according to claim 1.