Method for carrying out salt-free dyeing on un-scoured and unbleached cotton textile by reactive dyes

Abstract

The invention relates to a method for carrying out salt-free dyeing on an un-scoured and unbleached cotton textile by reactive dyes and belongs to the technical field of textile printing, dyeing and finishing. According to the method, the un-scoured and unbleached cotton textile is pre-swelled in a pre-swelling liquid which is formed by mixing a high-proportion alcohol-type organic solvent and a small amount of water, and the pre-swelled cotton textile is dyed by a dyeing liquid which is formed by mixing a high-proportion alcohol-type organic solvent, water and dyes, the wettability and the dyeability of the un-scoured and unbleached cotton textile can be effectively enhanced, and the pre-treating work processes of scouring and bleaching the cotton textile are reduced. The method can effectively enhance the dye-uptake rate, the color fixation rate, the dyeing effect and the color fastness of the reactive dyes onto the un-scoured and unbleached cotton textile, can completely meet production requirements, does not need salt, and is simple in technology, high in feasibility and easy for industrialization; the use amount of water is reduced greatly; besides, the alcohol-type organic solvents can be recycled, so that the method is little in pollution, low in cost, clean, energy-saving, safe and environment-friendly.

Description

technical field [0001] The invention relates to a salt-free dyeing method for unboiled and bleached cotton textiles with reactive dyes, belonging to the technical field of textile printing and dyeing. Background technique [0002] The material of cotton textiles is composed of cotton fibers. The cotton fibers in these undyed gray cloths contain natural impurities such as pectin and wax. These natural impurities mainly exist in the cuticle and primary cell wall of cotton fibers. Plus the oil and dirt on the fiber. The presence of these impurities not only makes cotton textiles yellow in color, rough in feel, but also poor in water absorption. For this reason, cotton textiles need to be scoured and bleached before dyeing. [0003] However, the traditional scouring and bleaching of cotton textiles is a wet treatment process, which requires heating and the use of chemical additives. Not only is the process lengthy, but it also consumes a lot of water and energy, which produces...

AI Technical Summary

Problems solved by technology

Although it uses organic solvents to dye textiles, it does have environmental protection effects such as no salt, but its disadvantage is that the textiles need to be pre-treated before dyeing.

Although it adopts the method of pre-swelling the textiles to be dyed with water, then dyeing in pure water dyeing solution, and finally adding organic solvents, it can indeed achieve a certain salt-free dyeing effect, but its disadvantages are Not only the process is more complicated, but also due to the poor water absorption of uncooked and bleached cotton textiles, it is impossible to pre-swell uncooked and bleached cotton textiles with water

Although the method it adopts can achieve a certain leveling effect, its disadvantage is that the method needs to add organic solvents in batches, and the process is relatively complicated.