Method for dyeing reactive dye by one-step method without salt

Abstract

The invention relates to a method for dyeing a reactive dye by one-step method without salt. The method comprises two-dip-one-dry or three-dip-one-dry process, wherein dye solution used for dipping and drying consists of 15 to 25g/l of dye and 1g/l of an alkaline agent; pickup is between 55 and 60 percent; then, the dyeing solution is subjected to steaming, washing, hot water washing and drying. The method has a simple dyeing process, does not have special requirement on the dye, does not relate to modification of fibers and application of salt-free dye cross linker; preliminary drying and cylinder drying are saved, and consumption of heat energy is greatly reduced; compared with a cold pad-batch dyeing process, the defects of cold pad-batch clearance production is improved, efficiency is improved, and defects of water spots, stains and hard hand feel are overcome.

Description

Technical field [0001] The invention belongs to the field of reactive dye dyeing, and particularly relates to a reactive dye one-step salt-free dyeing method. Background technique [0002] In recent years, cotton fiber has developed rapidly because of its green and environmentally friendly ecological characteristics, which caters to people's psychology of returning to nature and pursuing green. Reactive dyes have the advantages of complete chromatogram, bright color, simple application process, strong applicability, and relatively low price, and become the dye with the largest output and output value among the dyes for cotton fiber. But the most prominent problem of reactive dyes is the low fixation rate. In order to improve its dye uptake, a large amount of inorganic salts (sodium chloride or sodium sulfate) are added in the traditional dyeing process of cotton fiber. Depending on the structure and color of the dye, the amount of salt used is generally 30-100g / L. The addition of...

AI Technical Summary

Problems solved by technology

At present, many compounds cannot compete with the currently used table salt and sodium bicarbonate in terms of economic cost, but they have a strong dyeing effect, are environmentally friendly, and have broad application prospects. Because most of these compounds are still salts, they are called "salts". substitute salt"