JPS6158596B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a treatment method that significantly improves the quality and quality of dyed textile products. More specifically, the present invention relates to a treatment method that prevents contamination during soaping of textile products obtained by printing or dyeing fabrics made of a mixture of different fibers, and also improves color fastness and brightness. Printed fabrics made of single fibers such as natural fibers, recycled fibers, semi-synthetic fibers, and synthetic fibers, as well as mixed products such as blends, interwovens, and mixed fibers made of combinations of these fibers, are dyeable to each fiber. For textile products printed or dyed using one or more of the following dyes, especially those dyed with disperse dyes on the polyester side, when soaping, the disperse dyes may be mixed with the mating material such as interweaving or blending. The quality of the printed material was extremely poor due to the problem of contaminating the printed material or the white areas of the printed material. Polyester blend products dyed using disperse dyes for polyester should be reduced and washed to improve color fastness, i.e. hydrosulfite,
80℃ in a treatment bath containing caustic soda and surfactant
It is normal to process before and after. however,
Disperse dye for polyester contamination of other materials at 50℃
Because it begins to occur nearby, it is often necessary to lower the processing temperature below 50°C. This is especially common with polyester/polyamide mixed products. However, in such a case, the color fastness, particularly the washing and abrasion fastnesses, will naturally be poor, and the clarity will also be poor. The present inventors have previously proposed treating the fabric with an alkaline soaping bath containing a chlorine bleach in order to prevent contamination of the fabric. However, even with this method, although contamination could be improved, the effect was not complete. In other words, oxidation with chlorine bleach alone does not completely decolorize the dye, leaving a faint color in the soaping bath, which is re-absorbed by the fabric, so there is a limit to how well it can prevent white spot contamination. . Furthermore, treatment with an acidic bath containing a reducing agent is effective in preventing white spot staining, but has the disadvantage of decolorizing the dyed material. The present inventors have discovered that the dyed material is not bleached,
As a result of intensive research on soaping methods that do not cause surface contamination, we have discovered an innovative method that can prevent contamination of all textile dyeing and printed products by treating them with chlorine bleach and reducing bleach. I reached it. In other words, the present invention provides, ``After printing the fabric,
Alternatively, it is a post-treatment method for textile products, which comprises dyeing a mixed fabric of different types of fibers, treating it with an alkaline soaping bath containing a chlorine bleach, and then treating it with a reducing bleach. Originally, there was a concern that if chlorine bleach, which is an oxidizing agent, and reducing bleach were used together, the effects would cancel each other out. However, according to the research of the present inventors,
First, it became clear that if the material is treated with a chlorine bleach and then a reducing bleach is added after the temperature is raised, the effects of both will not be lost. In other words, chlorine bleach, which is an oxidizing agent, is active at low temperatures, so add it first.
It is clear that when a reducing agent is added after the temperature is raised to a temperature at which the reducing bleach becomes activated, the colored substances, which are decomposition products of the chlorine bleach, are further decomposed and become colorless in the bath. It became. For this reason,
It has now been possible to obtain printed fabrics and dyed fabrics containing mixed fibers with almost no staining due to soaping. The present invention will now be described in more detail. The soaping bath referred to in the present invention is intended for the purpose of preventing staining of dyed or printed products, improving color fastness, and improving brightness, and the composition thereof is known sodium hydroxide, It consists of alkaline substances such as sodium carbonate, aqueous ammonia, and sodium silicate, and surfactants such as soap and synthetic detergents. Examples of the chlorine bleach that can be added to this bath include alkaline and active bleaching powder, sodium hypochlorite, and the like. Chlorine bleach appears to selectively destroy dyes released into the soaping bath. Therefore, it is not effective against dyed materials once they have been contaminated. In general, in soaping baths, dyes begin to be liberated at relatively low temperatures, and contamination begins at higher temperatures, but chlorine bleach is active at a lower temperature than the temperature at which contamination begins, so the liberated dyes become white. To minimize the chance of contaminating the fabric or fibers that are not originally intended. On the other hand, even if the surface is first treated with a reducing bleach and then treated with a chlorine bleach, it is not possible to prevent white spot contamination at all. It is essential to treat with chlorine bleach and then with reducing bleach. Since it is uneconomical to use a large amount of chlorine bleach, it is necessary to increase or decrease the amount of chlorine bleach depending on the amount of active ingredients, the dye used, the dyeing concentration, etc. For example, for polyester/cotton blends dyed with disperse dyes/reactive dyes, a sodium hypochlorite solution containing approximately 11% available chlorine may be added at 0.2% to 1.0% by weight of the soaping bath; For substances, 0.5% to 2.0% is preferred. In addition, for polyamide/polyurethane printed with acid dyes, 0.1% to 0.5% is sufficient. When using salashi powder with an active ingredient of about 30%, the amount of sodium hypochlorite used is 50% of the amount mentioned above.
Approximately 30% is sufficient. For dyed products obtained by color development and fixation after applying the dye solution to a contaminated item or a fabric mixed with different types of fibers and drying, wash thoroughly with cold water or thoroughly remove the size using an alkaline soap bath at a low temperature. After going,
It is preferable to start at a low temperature and gradually increase the temperature using an alkaline soaping bath containing chlorine bleach. Reductive bleaches include sodium hydrosulfite called hydrosulfite, sulfur dioxide gas, acidic sodium sulfite, and sulfoxylates/formaldehydes, which are alkaline and stable.
Furthermore, hydrosulfite is most desirable because it does not bleach the dyed material and is easy to handle. The amount used is 0.05% to 5% of the weight of the soaping bath, depending on the active ingredients, dye concentration, amount of chlorine bleach used, etc., as it is uneconomical to use too much.
It is desirable to increase or decrease within the range of . It is more effective to add the reducing bleach at a temperature higher than the temperature at which hydrosulfite activation begins, rather than adding it to the chlorine bleach bath from the beginning. In the case of continuous treatment, it is also possible to provide a washing tank, an alkaline chlorine bleaching tank, and then an alkaline hydrosulfite tank. In an alkaline bath, hydrosulfite
Since activation begins near 50°C, it is desirable to add at a temperature above this temperature. However, the effectiveness of preventing white field contamination varies depending on the dye used.
Hydrosulfite is added at temperatures above 80℃ for printed and dyed fabrics using disperse dyes, and above 60℃ for fabrics using cationic dyes and acid dyes, even at elevated temperatures. There are two types: one type that does not cause contamination, and the other type that, even if contamination can be prevented once at 50°C, re-contamination occurs when the temperature rises. For the latter dye type, the timing of addition of hydrosulfite is delayed, and after treatment in an alkaline soaping bath containing chlorine bleach at 60°C or higher, a predetermined amount of hydrosulfite is added to the bath. It is desirable to treat until there is no contamination. This results in
Since colored substances, which are decomposition products of dyes, are further decomposed with hydrosulfite, pollution can be prevented. In such treatments, textile products that become brittle or yellow due to residual chlorine, such as cotton, wool, natron, and polyurethane, can be treated with hydrogen peroxide, sodium thiosulfate, or acidic sodium sulfite. desirable. The present invention relates to natural fibers, regenerated fibers, semi-synthetic fibers, synthetic fibers, or fabrics containing these fibers,
It can be applied to textile products such as knitted fabrics, nonwoven fabrics, and carpets, as well as dye types that can be dyed to these textile products. It is particularly useful when using disperse dyes or when printing products made of mixed fabrics of polyamide and polyurethane fibers, which are susceptible to staining. Hereinafter, the present invention will be explained in detail with reference to Examples. Example 1 A polka dot pattern was printed on a polyester/cotton (65/35) mixed fabric using a color paste according to the following method using an autoscreen printing machine. DIANIX BLUE BG-FS 50g (Mitsubishi Kasei, acid separation dye) PROCION BLUE H-5R 20g (ICI, reactive dye) Urea 50g Soda ash 20g MS powder 30g (Meisei Chemical, reduction inhibitor) Sodium alginate NSPM 500g (solid content 10%, made by Kamogawa Kasei, sizing agent) 330g of warm water Total 1000g After drying this printed fabric at 100℃ for 2 minutes, dry it at 190℃.
Dye fixation was achieved by processing for 60 seconds. This printed fabric was washed with water and treated in a soaping bath according to the following A, B, and C treatments at a bath ratio of 1:40 at a temperature raised from 30°C to 80°C for 20 minutes.

【table】

[Table] In Process C, hydrosulfite was added after the temperature was raised to 50°C. This treated cloth was heated to 60℃ for 20 minutes in a dechlorination bath using the following method.
Processed for minutes. Hydrogen peroxide solution (35% solution) 5g/Soda ash 1g/Maximum absorption wavelength of the white area of the obtained printed product
The reflectance at 620 mμ was as follows, and the effect of preventing white field contamination by the disperse dye was remarkable. Treated fabric Reflectance (%) Original fabric 84.3 Process A 75.6 Process B 82.4 Process C 84.0 In addition, the wet friction and washing fastness were improved by about 0.5 and 1 grade compared to Process A, respectively, and the color was clear and clear. Her sexuality was also improved. Example 2 A polka dot pattern was printed by hand on a polyester/polyamide (50/50) mixed yarn fabric using colored paste according to the following method. SUMIKALON RED S-BL 40g (manufactured by Sumitomo Chemical, disperse dye) Maypro Gum NP (solid content 12%) 600g (manufactured by Maypro, glue) MS powder 30g Tartaric acid (solid content 50%) 10g Urea 50g Warm water 270g Total 1000 g of this printed fabric was treated with a high-pressure steamer at 130° C. for 30 minutes to fix the dye. This printed fabric was washed with water and treated at 80° C. for 20 minutes in a soaping bath according to the following D, E, and F treatments at a bath ratio of 1:40.

[Table] In the Conch F treatment, after being treated at 80°C for 20 minutes, hydrosulfite was added and treated for 5 minutes. This treated cloth was subjected to dechlorination treatment under the same conditions as in Example 1. Maximum absorption wavelength of the white area of the obtained printed product
The reflectance at 540 mμ was as follows, and the effect of preventing white areas by the disperse dye was remarkable. Treated fabric Reflectance (%) Original fabric 53.2 D treatment 29.9 E treatment 44.7 F treatment 51.8 Example 3 A knitted fabric made of polyamide/polyurethane (50/50) was hand printed using colored glue according to the following formula. I printed a polka dot pattern on it. SANDLAN BRILLIANT RED N3B 140% (manufactured by SANDOZ, acid dye) 20g Gliescin A 20g (manufactured by BASF, dye solubilizer) Maypro Gum NP (solid content 12%) 500g (manufactured by Maypro, glue) Ammonium sulfate 20g Hot water 440g Total 1000g of this The printed fabric was dried at 120°C for about 60 seconds, and then treated with an atmospheric pressure steamer at 100°C for 30 minutes to develop and fix the color. Next, after thoroughly removing the starch in a bath containing 2 g of caustic soda (approximately 44% concentration product), it was treated at 60° C. for 20 minutes in a soaping bath of the following G, H, and I treatments.

[Table] In Process I, hydrosulfite was added after the temperature was raised to 50°C. This treated cloth was subjected to dechlorination treatment under the same conditions as in Example 1. Maximum absorption wavelength of the white area of the obtained printed material
The reflectance at 540 mμ was as follows, and a printed material with little staining by acid dye was obtained. Treated fabric Reflectance (%) Original fabric 65.3 G treatment 42.1 H treatment 58.4 I treatment 63.6 Also, as in Example 1, this printed material had better wet rubbing and washing fastness than G treatment. , which was an improvement of about 1 grade.

Claims (1)

[Claims] 1. A post-treatment method for textile products, which comprises, after printing a fabric or dyeing a fabric mixed with different types of fibers, treating it with an alkaline soaping bath containing a chlorine bleach, and then treating it with a reducing bleach. .