Dyeing and washing one bath process for pretreatment of polyester-cotton fabric

Abstract

The invention provides a dyeing and washing one bath process for pretreatment of polyester-cotton fabric. The dying and washing one bath process for pretreatment of the polyester-cotton fabric includes the following steps that bath dyeing of polyester is carried out, specifically, hydrogen peroxide and an alkaline levelling agent are added into polyester fabric in sequence, disperse dyes are usedfor dyeing, and the bath-dyed polyester is obtained; over dyeing of cotton is carried out, specifically, reactive dyes and a sodium sulfate solution are added in cotton fabric in sequence, the sodiumsulfate solution is used for dyeing, and the over-dyed cotton is obtained; one bath soaping is carried out, specifically, RCLN is added to the bath-dyed polyester and the over-dyed cotton for soaping,and the pretreated polyester-cotton fabric is obtained. According to the dyeing and washing one bath process for pretreatment of the polyester-cotton fabric, the specific alkaline disperse dyes are selected, meanwhile, auxiliaries are used for carrying out oxygen bleaching, dyeing and washing one bath process treatment on the polyester-cotton knitted fabric, the process and technology are simplified and shortened, the production efficiency is improved, the quality is guaranteed, and the effect of saving energy and reducing emission are achieved.

Description

technical field [0001] The invention relates to the field of fiber preparation, in particular to a one-bath dyeing and washing method for pretreatment of polyester and cotton. Background technique [0002] In the traditional process, the refining oxygen bleaching of cotton fiber needs to be carried out under alkaline conditions and hydrogen peroxide, while the traditional disperse dyeing of polyester fibers needs to be carried out under weak acidic conditions. Therefore, there is a contradiction between the pH of the polyester dyeing bath and the cotton fiber bleaching bath. If the alkali in the previous bleaching process is not removed, it will also cause fluctuations in the pH value of the polyester acidic condition, resulting in fluctuations in dyeing quality. However, under acidic conditions, polyester fabrics tend to produce oligomers and adhere to the fiber surface in large quantities, thereby affecting fiber performance and appearance quality; moreover, a large amount...

AI Technical Summary

Problems solved by technology

However, under acidic conditions, polyester fabrics tend to produce oligomers and adhere to the fiber surface in large quantities, thereby affecting fiber performance and appearance quality; moreover, a large amount of oily oligomers will also firmly adhere to the inner wall and pipeline of the high-temperature and high-pressure machine, thereby It increases the difficulty of cleaning the tank; in addition, polyester-cotton blended fabrics are dyed under acidic high-temperature conditions, and the long-term action of acid will cause hydrolysis of cotton fibers and decrease in strength, which will affect product quality

After dyeing, it will be restored and cleaned, which will consume a lot of energy such as water and electricity, and will also take a lot of time.

The whole process is complicated and cumbersome, the process lasts more than ten hours, the production efficiency is low, the consumption of water, electricity, and steam is large, and the sewage discharge is large; and due to the long wet processing time, it is easy to make the cloth surface fuzzy and affect the fabric feel, resulting in product quality. and the decline in the economic efficiency of enterprises

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