Low temperature dyeing technology for pure cotton fabrics

Abstract

The invention relates to a low temperature dyeing technology for pure cotton fabrics. The technology which adopts low temperature preprocessing, polishing and low temperature dyeing one-bath process comprises the following steps: 1, carrying out low temperature preprocessing: adding a dyeing one-bath assistant to a dye solution, adjusting the temperature to 40-60DEG C, and continuously reacting for 15-30min; 2, polishing: adjusting the temperature to 35-60DEG C and the pH value to 5.5-6, adding a neutral polishing enzyme having a weight accounting for 0.2-0.5% of the weight of the fabrics, and continuously reacting for 15-20min; and 3, carrying out low temperature dyeing: adjusting the temperature to 35-45DEG C, sequentially adding a low temperature active dye, anhydrous sodium sulfate, soda ash and a caustic soda solution at a certain time interval, and reacting. The low temperature dyeing technology has the advantages of simple operation, small pollution, low energy consumption and the like.

Description

technical field [0001] The invention relates to a dyeing process of pure cotton fabric. Background technique [0002] With the support of relevant national and local government policies, my country's textile printing and dyeing industry is actively taking various measures to save energy and reduce emissions. At present, the energy-saving measures taken by dyeing factories are generally two aspects: one is the transformation of dyeing and finishing equipment, gradually eliminating old equipment with high energy consumption and low output, and adopting new types of small liquor ratio dyeing equipment to reduce water consumption; the other is to pay attention to Develop new dyes and auxiliaries, and carry out technological innovation to solve the problems of high energy consumption and heavy pollution in traditional printing and dyeing production, so as to meet clean, environmental protection, and low-carbon standards. [0003] The traditional dyeing process of pure cotton kni...

AI Technical Summary

Problems solved by technology

[0003] The traditional dyeing process of pure cotton knitted fabrics needs to go through multiple processes such as high temperature pretreatment at 95°C→acid washing and neutralization→washing→polishing→enzyme killing→washing→dyeing. The process takes a long time and consumes a lot of water, electricity, steam and energy

Conventional cotton fabric polishing uses acid polishing enzyme, which needs to be carried out separately before or after oxygen bleaching of the fabric, not in the same bath as dyeing, and after polishing, the influence of enzyme activity on the strength of the fabric should be taken into account. It also needs to add alkaline agent or kill enzymes under high temperature conditions, so more water, electricity, steam and process time are required

The low-temperature reactive dyes such as X-type and Pusian MX-type launched in the early stage in China have not been widely used in industrial production due to the influence of factors such as strong reactivity of dye reactive groups, poor dye solution stability, and insufficient dye lifting power.

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