Reduction clearing method used for synthetic fiber

Abstract

The invention relates to a reduction clearing method used for synthetic fiber. The reduction clearing method comprises the steps of adding dyed synthetic fiber into reductive cleaning liquid, raising the temperature to 70-80 DEG C, maintaining the temperature and conducting reaction for 10-20 min, discharging water, afterwards, adding water, raising the temperature to 70-80 DEG C, maintaining the temperature and conducting reaction for 5-15 min, and accomplishing the reduction clearing. According to the reduction clearing method used for synthetic fiber, through the coordinative use of a reductive cleaning agent and sodium carbonate, under the condition that the influence on color shade of a shell fabric is small, color fastness of the shell fabric is improved; in addition, the reduction clearing method is simple and easy to control.

Description

technical field [0001] The invention relates to a reduction cleaning method for synthetic fibers. Background technique [0002] After polyester and its blended fabrics are dyed with disperse dyes, in order to improve the dyeing fastness, reduction cleaning is usually required. At present, the more common reducing cleaning agents are caustic soda and sodium hydrosulfite. The principle is to use the reducing property of sodium hydrosulfite to destroy the color development system of disperse dyes, so as to achieve the purpose of removing floating color and improving color fastness. [0003] Initially, using alkaline hydrosulfate to restore and clean polyester had great advantages, but under the background of increasingly severe environmental protection situation, stricter safety production management and declining profits of printing and dyeing enterprises, the disadvantages of hydrosulfite also quickly appeared. [0004] The main disadvantages of sodium bicarbonate in use are...

AI Technical Summary

Problems solved by technology

[0005] (1) Hydrosulfite will spontaneously ignite, especially after absorbing moisture, it will automatically heat up and burn, and fires frequently occur in warehouses storing hydrosulfite

[0006] (2) Hydrosulfur powder is easy to release sulfur dioxide gas when it is in use, which will cause environmental pollution in the workshop and damage the health of workers. At the same time, the harsh working environment will increase the labor cost of the enterprise

[0008] (5) The storage stability of sodium hydrosulfite is very poor, and it will decompose when exposed to the air under low temperature conditions, resulting in a continuous decline in active ingredients

[0009] (6) According to the provisions of the national standard GB6844-86 "Classification and Product Name Number of Dangerous Goods", sodium bicarbonate belongs to the first-class wet flammable goods, so it has high transportation risks and transportation costs

Images