Color fixing substitution alkali for low-salt dyeing by using reactive dye pad steaming process

Abstract

The invention relates to color fixing substitution alkali for low-salt dyeing by using a reactive dye pad steaming process, and the color fixing substitution alkali can be applied to low-salt color-fixing treatment on a cotton fabric dyed with a reactive dye. The color fixing substitution alkali is an organic / inorganic composite buffer system consisting of alkali metal hydroxide, alkali carbonate, a dispersing agent, an alkali-resistant penetrating agent and an accelerating agent. The traditional color-fixing alkali agent for the reactive dye is replaced and low-salt dyeing is realized under the condition of not changing the traditional technological equipment and flow. The color-fixing substitution alkali agent has the characteristics of low consumption, favorable stability, convenience for operation, and the like, meanwhile, is beneficial to reduction of production cost and environment pollution, has little influence on the equipment and meets the requirements on energy saving, emission reduction and efficiency increase.

Description

technical field [0001] The invention relates to a color-fixing substitute alkali used for low-salt dyeing by pad-steaming of reactive dyes, and belongs to the technical field of dyeing with novel printing and dyeing auxiliaries. It can be applied to low-salt color-fixing treatment of cotton fabrics dyed with reactive dyes. Background technique [0002] Reactive dyes are a class of water-soluble dyes with reactive groups in chemical structure developed in the 1950s. It has the advantages of convenient dyeing, bright color, complete color spectrum, good level dyeing property, excellent wet fastness, etc. It has become the main dye of cotton, regenerated cellulose fiber and its blended fabrics. [0003] The dyeing process of reactive dyes includes three stages of dyeing, color fixing and soaping post-treatment. In the dyeing stage, the dye is firstly adsorbed on the surface of the fiber through van der Waals force and hydrogen bonds, and diffuses into the fiber. The dye is on...

AI Technical Summary

Problems solved by technology

However, the alkali substitutes on the market currently have their own characteristics due to their chemical structure, properties, and performance being different from traditional alkali agents in specific applications, but there are generally the following problems: first, they have obvious effects on dyestuffs. Selectivity, the dye structure is different, and its color fixing effect is also different; second, the pH value and color fixing depth of the dye solution fluctuate greatly with the concentration of the dosage, and its buffer stability and color fixing stability are not as good as soda ash; third, most Alkali substitutes use alkali metal phosphates and silicates, which lead to environmental pollution and equipment corrosion; fourth, the quality of products from different manufacturers and different product numbers varies, and large and small samples are unstable and difficult to control; Fifth, most alkali substitutes are currently only suitable for exhaust dyeing

At the same time, there are many low-salt and salt-free dyeing processes in the industry. However, these low-salt and salt-free dyeing processes are all based on modifying the fabric fibers before dyeing to improve the relationship between dyes and fabric fibers. The affinity between dyes, thereby improving the exhaustion rate and fixation rate of dyes, and achieving the purpose of using less or even no inorganic salts in the dyeing process, but compared with the original traditional process, this undoubtedly adds to the original process equipment. Burden, prolong the time of the whole dyeing process and also bring inconvenience to the operation

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