Low-temperature scouring and bleaching agent and preprocessing technique for cotton or cotton blended fabric used therefor

Abstract

The present invention realtes to a low temperature scouring and bleaching agent belonging to the pretreatment process technology field of the textile printing and dyeing industry, a manufacturing method thereof and a pretreatment process. Said low temperature scouring and bleaching agent consists of promoter QR2010 consisting of carbon tetrachloride, acetic acid esters, alkyl benzenes, emulsifying agents and scouring agents; promoter QR2011 consisting of potassium hydroxide, carbonates and penetrating agents; and promoter QR2020 consisting of acyls and nitriles activating agents and builders. Said three promoters are prepared using routine methods and are deposited solely. When used, the three promoters, together with hydrogen peroxide, are mixed according to different proportions to prepare solutions. Said low temperature scouring and bleaching agent is capable of annealing, boiling and bleaching a variety of cotton as well as cotton blending textiles at any temperature ranging from 40 DEG C to 80 DEG C, and being processed at different scouring and bleaching equipments, with a whiteness of higher than 80% and a capillary effect of 10-20 cm. Compared with the process in existing, the amount used of hydrogen peroxide activating agent is 1 / 7 to 1 / 5 of that originally used, the total energy consumption is reduced, the tonnage of used water is decreased, and billet flaws such as holes bleached by oxygen and lycra folded crepes sourced and bleached are avoided.

Description

technical field [0001] The present invention relates to a kind of pretreatment auxiliary agent and its preparation method in the technical field of textile printing and dyeing processing and the technology used for the pretreatment of related fabrics, in particular to a low-temperature scouring and bleaching agent and its preparation and use in cotton or cotton Low-temperature desizing, scouring and bleaching (that is, desizing, boiling and bleaching) three-in-one (same bath) pretreatment technology for blended textiles. Background technique [0002] Cotton fiber contains natural impurities such as 0.4-1.2% pectin, 0.4-1.2% wax, 1.0-1.9% protein, 0.7-1.6% ash and a small amount of pigment, which is called the natural copolymerization of cotton fiber. thing. These impurities mainly exist in the cuticle and primary cell wall of cotton fiber. Their presence makes cotton hydrophobic, hindering the penetration and diffusion of dyes. In addition to sizing the spinning yarn, siz...

AI Technical Summary

Problems solved by technology

[0016] The former uses NOBS and hydrogen peroxide in an equimolar ratio in the presence of caustic soda and surfactants, combined with amylase to desizing and bleaching cotton fibers at 70°C in one bath, to obtain the same whiteness and desizing rate as the traditional process; The latter uses TAED or NOBS to bleach cotton with hydrogen peroxide at 55-80°C, but the dosage of NOBS and TAED activators in this method is as high as 2 grams per liter, and the lower the temperature, the higher the dosage, which increases the processing cost; in addition, these patents It only solves the difficulty of low-temperature bleaching with hydrogen peroxide, but does not solve the difficulty of low-temperature scouring, so it is even more impossible to realize the three-in-one (ie, one bath) low-temperature pretreatment process of cotton retreating, boiling, and bleaching

[0017] (3) The research results or patents aimed at the low-temperature scouring and bleaching agent used in the three-in-one pretreatment process of cotton and cotton blended textiles have not yet been found