JPS62282085A - Post-treatment of dyed article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a post-treatment method for dyed products. More specifically, the present invention relates to a method for post-processing dyed products of hydrophobic fibers or mixed fibers of hydrophobic fibers and hydrophilic fibers.

"Prior Art" After dyeing, various textile products are subjected to treatments such as water washing, hot water washing, and saw pinking to remove unfixed dyes in order to improve their fastness.

Furthermore, in the case of dyed textile products with strong alkali resistance and reduction resistance, a reduction washing process is also performed.

This reduction cleaning step is generally carried out in a water bath using a combination of caustic soda and hydrosulfide. However, because hydrosulfide is a strong reducing agent and a large amount of caustic soda is required to keep hydrosulfite stable in water, reduction cleaning using hydrosulfite and caustic soda as described above is recommended. The application of the method is limited to the dyeing of textiles where the fibers and the dyes used are sufficiently resistant to these agents. For this reason, for example, when dyeing a blended product of polyester fiber (hydrophobic fiber) and cellulose fiber (hydrophilic fiber, cotton, rayon, linen, etc.) using the dyeing method, first dye the polyester fiber side with disperse dye in the first bath. Dyeing is carried out using a high temperature and high pressure method or a carrier method, followed by alkaline reduction cleaning using caustic soda and hydrosulfite. In this step, the disperse dye that has contaminated the cellulose fibers is reduced and decomposed and solubilized or dispersed in an alkaline bath. Next, wash with water and hot water,
Remove alkaline agents and reducing agents. Next, in the second bath, the cellulose fiber side is dyed with a reactive dye or a direct dye, washed with water, hot water, soaped, and dried to finish. In order to shorten this long process, if we dye the polyester fiber side with a disperse dye and the cellulose fiber side with a reactive dye or direct dye in the same bath, and perform reduction cleaning with caustic soda and hydrosulfide, the dyeing will occur on the cellulose fiber side. The reactive dyes and direct dyes caused by reductive decomposition etc. cause large discoloration, resulting in unfavorable results.

Even for dyed textile products made only of hydrophobic fibers, the process of alkaline reduction cleaning using caustic soda and hydrosulfite is an extremely effective method for removing unfixed dyes. As mentioned above, due to their strong alkalinity and strong reducing properties, among hydrophobic fibers, acetate fibers and the like, with the exception of polyester fibers, have a problem in that they cannot be used for reasons such as strength deterioration.

On the other hand, among hydrophilic fibers, dyed cellulose fibers are subject to decomposition and discoloration when treated with caustic soda and hydrosulfide, and dyed protein fibers such as wool and silk also cannot be used because they cause discoloration and deterioration of fiber strength due to decomposition. do not have. still,
In the two-bath dyeing method for polyester fiber/wool blend products,
After dyeing polyester with disperse dyes, reduction cleaning is sometimes performed with hydrosulfide using aqueous ammonia to weaken the strength of the alkaline agent, but there is a problem that the stability of hydrosulfide is insufficient.

``Problem to be solved by the invention'' Type of fiber and use for dyeing when post-processing dyed products of hydrophobic fibers or mixed fibers of hydrophobic fibers and hydrophilic fibers for the purpose of improving fastness, etc. It is desired to develop a method that can be implemented without being restricted by the type of dye used.

"Means for Solving the Problems" The present inventors have made extensive efforts to solve the above-mentioned problems, and as a result they have arrived at the present invention. That is, the present invention involves treating a dyed product of hydrophobic fibers or mixed fibers of hydrophobic fibers and hydrophilic fibers in an alkaline water bath containing L-ascorbic acid, isoaxcorbic acid, or an alkali metal salt thereof. Provided is a post-processing method for dyed products characterized by the following.

The present invention will be described in detail.

In the present invention, examples of the hydrophobic fiber include polyethylene terephthalate, polyester mainly composed of polyethylene terephthalate, acidic polyester, cellulose diacetate, cellulose triacetate, polyamide, and polyacrylic.

The dyed products of these fibers are obtained by ordinary dyeing methods using disperse dyes, cationic dyes, acid dyes, etc., but the dyes are particularly alkali-removable dyes with alkali-soluble groups, which are easily reduced. Suitable are dyes for reduction-resistant discharge printing which have groups.

Examples of hydrophilic fibers include cellulose fibers such as cotton, linen, and rayon, and protein fibers such as wool and silk.

These dyed products are obtained by conventional dyeing methods using reactive dyes, direct dyes, acid dyes, and the like.

Furthermore, dyeing of mixed fibers of hydrophobic fibers and hydrophilic fibers involves the use of multiple types of dyes that can dye each fiber (for example, disperse dyes and direct dyes, disperse dyes and reactive dyes, basic dyes and acid dyes). etc.) by a conventional method, preferably by a one-bath dyeing method.

Examples of the forms of fibers used to obtain dyed products include interlaced knitted products, interwoven woven products, blended products, cotton, tow, yarn, knitted fabrics, and woven fabrics.

In the method of the present invention, L-ascorbic acid, isoascorhinic acid, or alkali metal salts thereof are used, and examples of alkali metals include sodium, potassium, lithium, and the like. In particular, sodium L-ascorbate and sodium isoascorbate are suitable in terms of solubility, reducing power, and economy. In addition, these may be used in combination of two or more types. Its usage amount is 0.1 to IO in water bath
g/,,7i! It is preferable to add 0.5 to 5 g/A.

Examples of alkaline agents constituting the alkaline water bath include bases that exhibit a pH value of 8 or higher in a 0.05% aqueous solution, i.e., alkali and alkaline earth metal hydroxides (e.g. hydroxide, potassium hydroxide). , alkali salts of alkali metals and inorganic weak acids (e.g. carbonates of alkali metals,
salts of alkali metals and organic acids (e.g. alkali metal formates), ammonia or aliphatic amines (e.g. triethylamine and its derivatives, ethanolamine and its derivatives, (tanolamine and its derivatives, triethanolamine), and latent alkalis that generate alkali upon heating, such as sodium trichloroacetate, and these may be used alone or in combination of two or more. The amount used in the usual processing method to obtain such conditions is 0.1 to 0.5 to 5 g/ffl! It is.

The treatment temperature can be varied from 20 to 100 degrees Celsius depending on the type and amount of the alkali agent and the type and amount of ascorbic acid, but it is generally 40 to 9 degrees Celsius depending on the properties and physical properties of the fiber and dye.
0°C is suitable.

The processing method is a batch method or a continuous method.
Process for ~60 minutes, preferably 10-20 minutes. In addition, in the case of a continuous method, a slightly higher temperature of 1 to 10
Preferably 2 to 5 minutes.

During washing, the dye is solubilized by alkali and reducing action,
In order to prevent the decomposed products from re-adhering to the treated material, it is also possible to add a surfactant or the like.

The characteristics of the present invention are summarized in Table 1 with examples of dyed polyester fiber/cotton blend products.

Table 1: In other words, it does not have any negative effect on disperse dyes dyed on materials such as polyester fibers, but it works extremely effectively on undyed dyes, which are easily decomposed and removed.

In addition, ascorbic acid under alkaline conditions shows the effect of decomposing and removing undyed reactive dyes while having almost no effect on reactive dyes dyed on cotton.

The present invention will be described in detail below with reference to Examples, but the present invention is not limited thereto. In the examples, "part n" is part by weight, 1% 1. is weight %, and temperature is in degrees Celsius.

Examples 1 to 5 A polka dot pattern was printed on a heat-resistant diacetate/rayon mixed woven fabric using a dyed Daido Engineering Autoscreen with the following composition, and intermediate drying was performed at 70°C for 10 minutes.
The dye was fixed by steaming at 00-103°C for 15-20 minutes.

The fixed cloth (printed cloth) was divided into seven parts and treated under each treatment condition, and the results of the degree of discoloration of the polka dots and the degree of contamination of hot water were as shown in Table 2.

(Color glue) KP Black GD-8paste
l 5 parts water
35 total
100 parts The product treated by the method of the present invention is as follows: ■ The heat-resistant diacetate side: - The water droplet part is jet black and has no discoloration - The hot water part is beautiful with no contamination - There is almost no deterioration in fiber strength ■ Rayon On the other hand, the results were as follows: - Disperse dye stains were removed and the fabric was beautiful - There was almost no deterioration in fiber strength, and an excellent treated product was obtained.

* Hue of the polka dots ◎...Things that exhibit black without discoloration×...
Items with significant discoloration ** Level of hot water contamination ◎... Items with almost no pollution in the hot water ×...
・・Contamination with hot water is extremely heavy Example 6: Floral patterns are printed on a mixed woven fabric of (warp) cotton/(weft) heat-resistant diacetate and polyester (manufactured by Mitsubishi Rayon) using a screen printing machine with the following composition. After drying at 70° C. for 10 minutes, the dye was fixed by HTS (superheated steam) treatment at 175° C. for 8 minutes.

The obtained fixed cloth (printed cloth) was divided into seven parts and treated under each treatment condition, and the results shown in Table 3 were obtained.

(Color glue) Kayacelon React Red CN-3B
2 parts (reactive dye, manufactured by Nippon Kayaku) Kayalon Polyester Red BD-
8Pa5te 4' (disperse dye, manufactured by Nippon Kayaku) Urea 15# Boiling water (pH 7-7.3)' 29 parts 100
Part * Hue of the flower stalk ◎... Red color with no change or fading ×...
・・Things that have changed color and faded ＊＊ Level of hot water contamination ◎・・・・Things that have almost no pollution in hot water ○・・・
・・・ 〃 Only a few 8°゛°゛°
Extremely thick Example 1 5g of reversible knitted fabric of 2゜(outer material) polyester fiber/(lining material) cotton was dyed at pH 7 using the following dye bath at a bath ratio of 1:30.
, staining was carried out at 130°C for 60 minutes.

The resulting dyed knitted fabric is washed in the following washing bath. The sample was treated at 70°C for 10 minutes, washed with water, and dried.

A beautiful fast-dyed reversible knitted fabric was obtained, with the outer material being red and the lining being yellow. Before the washing process, the cotton lining had significant red stains caused by the disperse dye, giving it an orange color, but these were removed by the washing process.

Example 1 A 3° polyester fiber/wool (50150) blended fabric was dyed in a bath containing the following dyes and chemicals at pH 5 and 105° C. for 60 minutes. The obtained dyed fabric was washed at 60°C for 15 minutes in the following washing bath.
It was separated, washed with water, and dried.

A fabric was obtained in which the polyester fiber was dyed orange and the wool was dyed red.

The dyed fabric before washing had a dull tone with orange stains caused by disperse dyes in the wool, but these were removed by washing.

Example 14 Acrylic fiber/cotton (50150) blended fabric was dyed in a dye bath containing the following dyes and chemicals at a bath ratio of 1:20. Staining was performed at pH 7 and 97°C for 60 minutes.

The resulting fabric was subjected to the following cleaning bath. The sample was treated at 60°C for 15 minutes, washed with water, and dried.

A fabric was obtained in which the acrylic fiber side was dyed blue and the cotton side was dyed yellow. Before washing, the dyed fabric had blue stains caused by cationic dyes on the cotton side, giving it a dark yellow color, but these were removed by washing.

Example 15 A mixed woven fabric of warp polyester ff 11m/weft cotton was padded in the following pad bath and squeezed to 95% with a mangle. followed by 100
Intermediate drying was performed at 200° C. for 3 minutes, followed by hot air treatment at 200° C. for 190 seconds. The obtained dyed woven fabric was treated in the following treatment bath at 80° C. for 5 minutes, washed with water, and dried.

A mixed woven fabric was obtained in which the warp threads were dyed blue and the weft threads were dyed red. Before the washing process, staining with blue disperse dye was observed on the cotton side, but it was removed by the washing process.

"Effects of the Invention" In post-treatment of dyed products of hydrophobic fibers or mixed fibers of hydrophobic fibers and hydrophilic fibers for the purpose of improving fastness, etc., the type of fiber and the type of dyed product used to obtain the dyed product are A processing method has been established that can be applied to any type of dye.

Claims (1)

[Claims] 1 Dyeing characterized by treating a dyed product of hydrophobic fibers or mixed fibers of hydrophobic fibers and hydrophilic fibers in an alkaline water bath containing L-ascorbic acid, isoascorbic acid, or an alkali metal salt thereof. Post-processing methods for things.