A low-temperature soaping agent for cotton knitted fabrics

Abstract

The invention belongs to the technical field of printing and dyeing auxiliaries, and particularly relates to a low-temperature soaping agent applied to a cotton knitted fabric soaping process. The low-temperature soaping agent for cotton knitted fabrics disclosed by the invention is prepared from the following components in parts by weight: 99.892 to 99.996 parts of organic peroxy acid and 0.004 to 0.008 parts of a catalyst. The composition of the low-temperature soaping agent for the cotton knitted fabrics disclosed by the invention is simple in composition, is convenient to use, and can be directly used after dyeing, the step of neutralization is omitted, moreover, fastness to soaping can be effectively increased, and soaping wastewater chroma and COD (chemical oxygen demand) are remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing auxiliaries, and in particular relates to a low-temperature soaping agent used in the soaping process of cotton knitted fabrics. Background technique [0002] Cotton knitted fabrics need to be soaped after dyeing with reactive dyes and sulfur dyes to remove unfixed dyes on the fabric and improve the color fastness of the dyed fabric. In addition, because a large amount of alkaline substances such as soda ash or sodium sulfide must be added during the dyeing process to fix the dye, acid neutralization treatment is required after soaping to adjust the pH value of the cotton knitted fabric to 6-7. [0003] The traditional post-dyeing treatment of cotton knitted fabrics is to wash them with hot water for 10 minutes, drain and refill the water, add acetic acid or other organic acids for 10-15 minutes to neutralize, and then adjust the pH value of cotton knitted fabrics to 6. Between ~8, af...

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: (1) The traditional cotton knitted fabric soaping process is basically carried out under the condition of 95-100 °C, and the soaping and holding time is 15-20 minutes, which requires a large amount of steam, and 1 ton of cotton Knitwear needs about 1-2 tons of steam, which accounts for about 20% of the total steam used for dyeing and finishing; (2) before soaping traditional cotton knitting, acid neutralization must be carried out to adjust the pH to 7-8, otherwise it will be damaged by alkalinity. Too strong will cause dye hydrolysis, affecting fastness, and the water consumption of acid neutralization process is large, resulting in high production energy consumption; (3) the chromaticity and chemical oxygen demand of soaping wastewater produced by traditional cotton knitted fabric soaping process (COD) is high, resulting in high pressure on sewage treatment in the printing and dyeing industry

The low-temperature scouring agent can effectively decompose hydrogen peroxide at low temperature (60-80°C), release active oxygen to achieve the effect of high-temperature scouring, but this low-temperature scouring agent is not suitable for the soaping process of cotton knitted fabrics

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