JP2516529B2 - Coloring method of colored raw cotton - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for developing colored raw cotton, and more particularly to a technique for developing multicolored materials without dyeing and improving light fastness.

[0002]

2. Description of the Prior Art Colored cotton that contains pigments such as beige and peppermint green in the cotton itself is 19
It was discovered during the development of insect-resistant cotton in the United States in 1982. Nowadays, the development is further progressing, and purple cotton and purple cotton are now available. A characteristic of colored cotton is that it has a color that cannot be obtained by dyeing, and because it is a natural pigment, it has a unique texture by mixing subtly different colors. Is used as.

[0003]

However, the above-mentioned colored cotton is limited to a variety of colors because the natural dye of the raw cotton is produced as it is, and only a light color can be obtained. Is large, the color fastness is low due to low light fastness, and it is expensive as a raw material. On the other hand, if dyeing is done in the same way as in the past,
It destroys the benefits of natural pigments. Therefore, an object of the present invention is to obtain a coloring method capable of freely producing various colors by using a natural pigment of raw cotton. Another object is to obtain a technique capable of preventing fading. Still other objects will be clearly shown in the following description.

[0004]

The present inventors have tried various methods for colored cotton based on the conventional dyeing technique, and as a result, the following method is extremely convenient for the purpose. That is, the present invention has been completed. The method involves immersing colored raw cotton in an aqueous solution containing a water-soluble metal salt to develop the color. The water-soluble metal salt is usually used as a mordant for dyeing the fiber on the cotton in the dyeing process of white cotton, but it discolors the natural dye of colored cotton and improves its light fastness. Let In particular, 1 selected from the group consisting of iron salts, cobalt salts, aluminum salts, chromium salts, copper salts, titanium salts and tin salts.
Alternatively, it is desirable to treat with an aqueous solution containing a predetermined amount of two or more water-soluble metal salts. A very large number of colors can be obtained by using each of these metal salts alone or in combination. Also, by mixing an alkali into the aqueous solution of the metal salt, the concentration of hydrogen ions in the aqueous solution changes, so that the color developed changes and a color that cannot be obtained with the metal salt alone is obtained.

[0005]

Next, embodiments of the present invention will be described. As the colored cotton, US green cotton and brown cotton were used. Colored cotton as it is (100%), or 50% or 25%
It was mixed with white cotton at the ratio of, and the raw yarn was made from this to make it in a rugged state. First, pre-treatment was performed in a bath with a penetrant in order to give the raw yarn an affinity with water. After that, the liquid was drained and transferred to a new bath, and the raw yarn was immersed in an aqueous solution in which a metal salt was dissolved. In the temperature cycle in the new bath, the temperature is maintained at room temperature, then the temperature is raised with a predetermined gradient, and the temperature is maintained at the predetermined temperature. After that, the liquid was drained and washed with water, and the washed yarn was made into a product through a treatment step with a softening agent, a dehydration step and a drying step.

Regarding the pretreatment, a penetrating agent (Leophen 1474 (BA) composed of a neutral phosphate ester is used without performing a scouring treatment which is usually carried out in a dyeing process.
After immersing in an aqueous solution containing SF brand name)), the temperature was raised and the mixture was treated in a boiling state for 15 minutes. In the coloring step, an aqueous solution in which 2% by weight of the metal weight of the metal salt was dissolved in about 20 times the weight of the fiber was used. In the immersion step in this aqueous solution, the temperature was raised at room temperature (about 25 ° C.) for 10 to 15 minutes, then at 2 ° C. per minute, and kept at the boiling state (about 95 ° C.) for 15 to 30 minutes. . As the metal salt, ferrous sulfate, cobalt acetate, aluminum acetate, chromium acetate, copper sulfate, an organic salt of titanium (trade name-titanium stock solution (Tanaka Nao dye shop)), and stannous chloride were used. When ferrous sulfate was used as the metal salt, the temperature was raised at 1 ° C./minute and stopped at 70 ° C. instead of the above temperature condition. The amount of the metal salt, the temperature cycle and the immersion time can be appropriately adjusted depending on the color development rate and the developed color of the metal salt.

Table 1 shows the types of metal salts when treated under the above conditions, the color and the light fastness of green cotton (raw cotton) and the treated yarn, and Table 2 shows brown cotton (raw cotton). And the color and lightfastness of the treated yarn. The L * a * b * color system (JIS-Z8729) was used for color display, and the third exposure method of JIS-L0842 was used for light fastness.
G: green, LG: light green, DG: dark green, B: brown, LB:
Light brown, DB: Dark brown is displayed. ＊＊＊＊＊＊＊＊＊＊ Table 1 (Green cotton) ＊＊＊＊＊＊＊＊＊＊＊ Metal salt color Lightfastness L * a * b * Raw cotton −56.93 -0.05 20.65 LG 2- Grade 3 A Ferrous Sulfate 40.31 -1.10 5.97 DG Grade 6 B Cobalt Acetate 52.53 -0.22 13.25 G Grade 5 C Aluminum Acetate 49.88 0.42 17.26 G Grade 4 D Chromium Acetate 38.27 3.32 13.22 GB Grade 6 E Copper Sulfate 42.97 2.75 16.10 GB 4 Grade F Titanium salt 53.09 7.36 24.82 B Grade 5 G Stannous chloride 54.51 3.75 21.88 B Grade 4 ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ Table 2 (Brown cotton) ＊＊＊＊＊＊＊＊＊＊＊ Metal salt color Lightfastness L * a * b * Raw cotton −58.66 9.27 19.97 LB 5th grade A Ferrous sulfate 41.35 2.82 8.98 DB 6th grade B Cobalt acetate 47.89 8.35 16.54 B 6th grade C Aluminum acetate 46.75 10.27 22.58 B 6th class D Chromium acetate 40.92 9.54 20.88 B 6th class E Copper sulfate 41.63 10.42 22.31 B 6th class F Titanium salt 52.48 9.97 21.93 LB 6th class G stannous chloride 47.28 9.99 20.73 B 6th class ＊＊＊＊＊＊＊＊＊＊＊ ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊

As can be seen in the above tables, green cotton,
Colors that are quite different from raw cotton are obtained for both brown cotton,
Moreover, the light fastness is improved under all conditions. Also,
All the colors obtained have changed to a deeper color, which is brighter than the original color, and a density comparable to that of ordinary dyed cotton is obtained. Raw cotton is light-colored and has low light fastness, and especially green cotton has a remarkable degree. Therefore, although the raw cotton is often already faded at the time of import, it is possible to recover the primary color by performing the above treatment. In addition, it has been confirmed that the above-described treatment hardly affects the color development of the raw cotton. Furthermore, sufficient reproducibility was obtained by the above-mentioned processing, and it was possible to control the variation of the primary color by adjusting the color after the color development in accordance with the color of the raw cotton. When mixed and treated with colored cotton and white cotton, both 50% and 25% have a slightly lighter color after coloring, but they are sufficiently practical products. In addition, by extending the treatment time or repeating the treatment a plurality of times and increasing the concentration of the metal salt within the range of 0.3% to 2.0%, the color of the product is darkened and the light fastness is high. It has been confirmed that the degree also improves.

Next, Table 3 shows the data when the raw cotton is dipped in an aqueous solution in which two kinds of water-soluble metal salts are mixed and dissolved. Here, the number described below the substance name indicates the weight% of each substance based on the fiber weight. ＊＊＊＊＊＊＊＊＊＊＊＊＊＊ No. 3 Table ＊＊＊＊＊＊＊＊＊＊＊＊＊ Metal salt color Lightfastness L * a * b * (green cotton) Sulfuric acid No. 1 iron + cobalt acetate 42.62 -0.61 4.98 DG 5 grade 1.0 2.0 (brown cotton) ferrous sulfate + chromium acetate 43.86 5.62 13.28 DB 6 grade 1.0 0.5 ferrous sulfate + cobalt acetate 44.86 5.78 13.78 DB 6 grade 1.0 2.0 Ferrous sulfate + titanium salt 45.72 4.40 12.96 DB 6 grade 1.0 2.0 ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ ************ As described above, in the present embodiment, by selecting and combining the metal salts, a multicolor and dark color is formed in an extremely short time in only one step. At the same time, the fastness to light can be improved, the fading of the raw cotton can be eliminated, and the variation in the color of the raw cotton can be adjusted. Furthermore, a sufficiently practical color is obtained even in a mixed yarn with white cotton, and the cost of the cotton yarn can be suppressed.

Next, the case where the green cotton is dipped in a metal salt aqueous solution to which an alkali is added will be described.
As the alkali, caustic soda, sodium carbonate, and ammonia water were mixed in the treatment liquid for the treatment, and in each case, a color different from the color development of the metal salt alone was obtained.
However, caustic soda had strong alkalinity, which caused damage to the fiber, and the degree of discoloration was excessive, resulting in poor controllability. Discoloration was found in both green cotton and brown cotton, but when the green cotton was treated with an aqueous solution mixed with ammonia water, as shown in Table 4, a hue (yellow color) which cannot be obtained only by the metal salt was obtained. Is weak and green is strong), and a vivid color with a sense of transparency is obtained. In addition,
In Table 4, the numbers below the substance names indicate the weight% of each substance based on the fiber weight. ＊＊＊＊＊＊＊＊＊＊＊ Table 4 (Green cotton) ＊＊＊＊＊＊＊＊＊＊ Metal salt, Alkali color, Lightfastness L * a * b * Ferrous sulfate + Ammonia water 49.40 -2.49 12.96 G Grade 6 1.0 2.0 Cobalt acetate + Ammonia water 48.67 -1.80 10.96 G Grade 5 1.0 2.0 ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊

As the metal salt according to the present invention, in addition to the above, aluminum salts such as alum, iron alum,
Iron salts such as iron acetate, copper salts such as copper acetate, tin salts such as sodium stannate and stannic chloride, chromium salts such as chromium chloride, dichromate, chrome alum, calcium salts, permanganate, etc. Can also be used.

[0012]

As described above, the present invention is characterized in that the colored raw cotton is soaked in the aqueous solution containing the water-soluble metal salt. Therefore, the following effects are obtained. Using natural dyes of colored raw cotton, while maintaining its advantages, it is possible to develop a variety of darker colors than raw cotton and to improve light fastness in essentially only one step. . Further, it is possible to adjust the variation of the color of the raw cotton, and it is possible to color the faded raw cotton without any trouble. By mixing an alkali in the aqueous solution, it is possible to further expand the color development range and obtain vivid and varied colors.

Claims (3)

(57) [Claims] 1. A method for coloring colored cotton, which comprises immersing colored cotton in an aqueous solution containing a water-soluble metal salt to develop the color. 2. The 1 or 2 selected from the group consisting of iron salt, cobalt salt aluminum salt, chromium salt, copper salt, titanium salt and tin salt, according to claim 1.
A method for coloring colored raw cotton, which comprises the above water-soluble metal salt. 3. The method for coloring colored raw cotton according to claim 1, wherein the aqueous solution is mixed with an alkali for treatment.