JPH04300374A - Treating agent for color-processing of indigo-dyed material and color-processing method - Google Patents

Abstract

PURPOSE:To enable vari-colored coloring of an indigo-dyed material such as blue jeans to color tones from orange to yellow, green blue, etc., by treating the dyed material with a processing solution containing a bromine-based oxidizing agent and a chlorine-based oxidizing agent. CONSTITUTION:An indigo-dyed material such as blue jeans is immersed in a processing liquid containing e.g. a bromine-based oxidizing agent and a chlorine-based oxidizing agent preferably at 40-70 deg.C for about 10-45min. The indigo-dyed material can be colored to a color tone ranging from orange to yellow, green or blue and a lightness from white to black.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing agent for color-processing indigo-dyed articles such as jeans, and a color-processing method using the same.

0002

[Prior Art] In recent years, in the jeans market, in order to meet the diverse fashion demands of consumers,
In addition to blue jeans, colored jeans such as black, red, green, yellow, and brown are on the market.

[0003] Currently, colored jeans are manufactured by dyeing cotton yarn with a dye of a desired color, then cutting and sewing raw material for jeans, which is spun and woven. However, with this method, it is necessary to switch dyeing machines and looms for each desired color. In addition, in order to reduce switching costs, raw fabrics dyed in various colors must be kept in stock.
The drawback was that it was unable to respond efficiently to market demands.

[0004] Yellow-brown jeans are also produced by discoloring blue jeans after sewing, but this method uses manganese, a heavy metal, so it is difficult to dispose of waste liquid and wear it. The toxic effect on the skin has been raised as a problem. Furthermore, no processing agent has been found that can color blue jeans to colors other than yellowish brown.

[0005]

[Problems to be Solved by the Invention] The present invention provides a color processing agent and a color processing method that can change the color of indigo-dyed materials such as blue jeans into various colors such as red, yellow, green, and brown. The purpose is to provide.

[0006]

[Means for Solving the Problems] As a result of extensive studies, the present inventor has found that by using a treatment agent containing a brominated oxidizing agent in combination with a chlorinated oxidizing agent, indigo-dyed objects can be dyed red, yellow, etc.
The present invention was completed by discovering that it can be changed to various colors such as green and brown.

The present invention is a method for color processing an indigo-dyed material containing at least a brominated oxidizing agent, or a brominated oxidizing agent and a chlorinated oxidizing agent. To color-process an indigo-dyed object using this, the indigo-dyed object must be treated with an aqueous solution containing a bromine-based oxidizing agent and a chlorine-based oxidizing agent, or the indigo-dyed object must be treated with an aqueous solution containing a brominated oxidizing agent. After that, it is further treated with an aqueous solution containing a chlorine-based oxidizing agent.

The brominated oxidizing agent used in the present invention is any brominated oxidizing agent that produces bromate ions, bromite ions, hypobromite ions, or bromide ions when dissolved in water. There is no particular limitation, and the brominated oxidizing agent may be a solid, a liquid, or a slurry in which the brominated oxidizing agent exists as a solid in a liquid.

Specific examples include sodium bromate,
Bromine compounds such as potassium bromate, sodium bromite, potassium bromite, sodium hypobromite, potassium hypobromite, sodium dibromoisocyanurate, potassium dibromoisocyanurate, and tribromoisocyanuric acid; bromine and hydroxide Examples include a reaction solution with an alkali such as sodium or potassium hydroxide at a molar ratio of 0.9:2 to 1.1:2.

Examples of the chlorine-based oxidizing agent used in the present invention include organic chlorine-based oxidizing agents having active chlorine such as sodium dichloroisocyanurate, potassium dichloroisocyanurate, trichloroisocyanuric acid, and dichlorodimethylhydantoin; hypochlorous acid; Examples include inorganic chlorine-based oxidizing agents having active chlorine such as sodium, potassium hypochlorite, sodium chlorite, potassium chlorite, and calcium hypochlorite.

When using an inorganic chlorine oxidizing agent, the pH
For adjustment and stabilization, it is preferable to use a pH adjuster and/or pH buffer in combination, such as acids such as acetic acid and hydrochloric acid; alkalis such as sodium hydroxide and potassium hydroxide;
Sodium acetate, sodium sulfate, sodium borate,
Mention may be made of organic or inorganic salts such as sodium phosphate.

When the color processing agent of the present invention is used as a preparation, the effective chlorine concentration of the color processing agent in the preparation (the effective chlorine concentration in the present invention refers to the concentration determined by the following measuring method, The bromine concentration is a value converted to a chlorine concentration (the same applies hereinafter) is 0.05 to 60%, preferably 0.1 to 50%.

Method for measuring available chlorine concentration: Accurately weigh (Xg) approximately 1 g of a sample into a 100 ml Erlenmeyer flask with a co-sensor, add 40 ml of water, 3 g of potassium iodide, and 5 ml of 20% sulfuric acid, and store in a dark place. 5
Leave for a minute. Add starch solution as indicator, 1/
Titrate with 10N sodium thiosulfate (Yml). Then, substitute it into the following equation to find the effective chlorine concentration. (f represents the factor of sodium thiosulfate.)

[0014]

[Math 1]

Specific examples of the color processing method of the present invention include the following methods. The first method is to color-process an indigo-dyed object in a bleaching solution containing both a brominated oxidizing agent and an organochlorine oxidizing agent.

The amount of the brominated oxidizing agent in the bleach treatment solution is 0.005 to 3%, preferably 0.005 to 3%, in terms of available chlorine.
01-2%. If this amount is less than 0.005%, the color processing effect may not be sufficient and the color may change from blue to white. If it exceeds 3%, environmental problems such as gas generation may occur. There is. Also,
The amount of organic chlorine oxidizing agent is 0.005 in terms of available chlorine amount.
-3%, preferably 0.01-2%. If this amount is less than 0.005%, it may take time to process the color from blue, and if it exceeds 2%,
Gas may be generated and the working environment may deteriorate. Then, the total available chlorine amount of the brominated oxidizing agent and the organochlorine oxidizing agent is:
It is preferably 3.5% or less.

[0017] The temperature of the bleach treatment solution for treating the indigo dyed article is 0 to 80°C, preferably 40 to 70°C. The treatment time is 1 to 90 minutes, preferably 10 to 60 minutes.

In this first method, the color of the indigo dyed object can be changed to orange, orange, etc. by combining the blending amounts of the brominated oxidizing agent and the organic chlorine oxidizing agent, the temperature of the bleaching solution, and the treatment time within the above-mentioned ranges. It can be processed in a variety of colors such as yellow, green, green, blue-green, tan, and brown.

The second method is to color-process an indigo-dyed object in a bleaching solution containing a bromine oxidizing agent, an inorganic chlorine oxidizing agent, and a pH buffer. The amounts of the bromine-based oxidizing agent and the inorganic chlorine-based oxidizing agent in the bleach treatment solution are the same as in the first method. The blending amount of the pH buffer is 0.05 to 10%, preferably 0.1 to 5%.
and when both acid or alkali are used,
The blending amount is adjusted so that the total amount of the pH buffer and acid or alkali falls within the above range.

The pH of the bleaching solution is 4-10, preferably 4.5-9. When the pH is out of the above range, the color of the indigo dyed material changes from blue to white.
Or it may turn a slightly yellowish color.

The temperature of the bleach treatment solution for treating the indigo dyed article is the same as in the first method. This second method is similar to the first method, and by combining the processing conditions within the above range, the color of the indigo dyed material can be changed to orange, yellow, light green, green, bluish green, tan, yellowish brown, etc. Can be processed in various colors such as brown.

The third method is to pre-treat the indigo dyed object with a first treatment solution containing a brominated oxidizing agent, and then apply a bleach containing an organic chlorine oxidizing agent or an inorganic chlorine oxidizing agent and a pH buffering agent. This is a method of color processing an indigo dyed object in a processing solution.

The amount of the brominated oxidizing agent in the first treatment solution is 0.01 to 3.5%, preferably 0.01 to 3.5%, in terms of available chlorine.
05-3%. When the blending amount exceeds this range, the effect of color processing may become insufficient as in the first and second methods. The blending amount of the chlorine-based oxidizing agent in the bleach treatment solution is 0.005 to 3.5%, preferably 0.01 to 3% in terms of available chlorine amount.

[0024] The temperature of the first treatment solution and the bleach treatment solution is 0 to 80°C, preferably 40 to 70°C. The treatment time of the first treatment solution is 1 to 30 minutes, preferably 5 to 2 minutes.
0 minutes, and the processing time of the bleach treatment solution is 1 to 60 minutes.
minutes, preferably 10 to 45 minutes.

This third method is similar to the first method, and by combining the processing conditions within the above range, the color of the indigo dyed material can be changed to orange, yellow, light green, green, bluish green, etc. Can be processed in a variety of colors such as tan and brown.

The bleaching solution contains various additives used in ordinary bleaching solutions, such as chelating agents such as sodium ethylenediaminediacetate and sodium ethylenediaminetetraacetate, preferably in an amount of 0.01 to 0.5% by weight. It can be added in an amount of 0.05 to 0.1% by weight.

[0027]

[Examples] Next, the present invention will be explained with reference to specific examples, but the present invention is not limited to these examples in any way.

Examples 1 to 3 and Comparative Example 1 As the bromine-based oxidizing agent, an aqueous solution (available chlorine 5%) of bromine and sodium hydroxide aqueous solution mixed at a molar ratio of 0.95:2 and as an organic chlorine-based oxidizing agent were used. Sodium dichloroisocyanurate (available chlorine 60%) was weighed into a 1000 ml beaker and diluted with water to a total volume of 1000 ml to prepare a color processing solution.

Tables 1, 2 and 3 show the available chlorine amounts of the brominated oxidizing agent and the organic chlorine oxidizing agent in the color processing solutions used in Examples 1 to 3 and Comparative Example 1. Next, 10cm x 10
A test piece of indigo-dyed blue jeans cut into a cm size was immersed in the above coloring solution at 50° C. to be colored. Tables 1 to 3 show changes in the color of the test pieces over time.

[0030]

[Table 1]

[0031]

[Table 2]

[0032]

[Table 3]

As is clear from Tables 1 to 3, Examples 1 to 3
In Comparative Example 1, in which no brominated oxidizing agent was used, the color changed from dark blue to green, yellow, and orange due to the concentration difference between the brominated oxidizing agent and the organochlorine oxidizing agent. Then, it only changed from dark blue to white.

Examples 4 to 6 and Comparative Example 2 As a brominated oxidizing agent, bromine and sodium hydroxide aqueous solution were mixed in a ratio of 0.95:2.
(available chlorine: 5%) and sodium hypochlorite (available chlorine: 1%) as an inorganic chlorine oxidizing agent.
2%) in a 1000ml beaker, diluted with water to a total volume of 1000ml, and then diluted with hydrochloric acid.
After setting H to 7.5, 10 g of sodium borate as a pH buffer was dissolved to prepare a color processing solution.

Tables 4, 5 and 6 show the available chlorine amounts of the brominated oxidizing agent and the inorganic chlorine oxidizing agent in the color processing solutions used in Examples 4 to 6 and Comparative Example 2. Next, 10cm x 10
A test piece of indigo-dyed blue jeans cut into a cm size was immersed in the above coloring solution at 50° C. to be colored. Tables 4 to 6 show changes in the color of the test pieces over time.

[0036]

[Table 4]

[0037]

[Table 5]

[0038]

[Table 6]

As is clear from Tables 4 to 6, Examples 4 to 6
In Comparative Example 1 in which no brominated oxidizing agent was used, the color changed from dark blue to green, yellow, and orange due to the concentration difference between the brominated oxidizing agent and the inorganic chlorine oxidizing agent. Then, it only changed from dark blue to white.

[0040]

Effects of the Invention According to the present invention, for example, an indigo-dyed material after sewing, such as blue jeans, can be dyed from orange to yellow to yellow.
Since it can be color-processed into colors that combine tones from green to blue and lightness from white to black, it is possible to efficiently meet the demands of the colored jeans market without having to keep stock of each color. .

Furthermore, since manganese is not used in color processing, there is no fear that the obtained colored jeans will be toxic to the skin, and the same waste liquid treatment equipment as in general bleach processing can be used.

Claims (3)

[Claims] 1. A treatment agent for color processing of indigo-dyed materials containing a bromine-based oxidizing agent. 2. A treatment agent for color processing of indigo-dyed materials containing a brominated oxidizing agent and a chlorinated oxidizing agent. 3. A method for color processing an indigo-dyed object, which comprises treating the indigo-dyed object in an aqueous solution containing a bromine-based oxidizing agent and then further treating the indigo-dyed object in an aqueous solution containing a chlorine-based oxidizing agent.