Low-alkali pretreatment method for in-situ catalytic degradation of impurities in cotton and cotton fabrics

Abstract

The invention relates to a low-alkali pretreatment method for the in-situ catalytic degradation of impurities in cotton and cotton fabrics, which comprises the following steps: (1) preparing a biological compound enzyme preparation, a biological enzyme synergist and a nonionic surfactant into enzyme working fluid; padding a fabric in the enzyme working fluid; and carrying out heat preservation on the fabric; and (2) directly padding the treated fabric into hydrogen peroxide bleaching liquid containing a hydrogen peroxide controlled decomposing additive, and then steaming, washing and drying the fabric. According to the invention, sizes and impurities are subjected to in-situ catalytic degradation in fabrication processing, therefore, an effect of ultrahigh-concentration wastewater treatment is achieved, fabrics are easy to wash, the washing temperature and washing frequency are reduced, more than 25% of water is saved, more than 30% of steam is saved, and more than 10% of electricity is saved. The COD (chemical oxygen demand) value is reduced by more than 30% in comparison with that of a traditional alkali scouring process, the B / C value of pretreated wastewater is about 0.4, and the biodegradability is improved. All indexes (such as whiteness, capillary effect, cottonseed hull removal rate, desizing ratio, strength, and the like) of treated cotton and cotton fabrics meets the quality requirements of semi-finished products.

Description

technical field

[0001] The invention belongs to the field of pretreatment of fabrics, and relates to a low-alkali pretreatment method for in-situ catalytic degradation of impurities in cotton and cotton-type fabrics, in particular to an enzyme-treated fabric directly padding containing hydrogen peroxide without washing. A low-alkali pretreatment method for cotton and cotton-type fabrics of hydrogen peroxide bleaching solution with controlled decomposition auxiliary agent, specifically a kind of enzyme-treated fabric without water washing directly padding containing hydrogen peroxide controlled decomposition auxiliary agent A low-alkali pretreatment method for in-situ catalytic degradation of impurities in cotton and cotton-type fabrics that uses hydrogen peroxide bleach, does not require strong alkali scouring, and only needs a small amount of alkali to adjust the pH value. Background technique

[0002] my country is the largest textile producer and exporter in the world. Th...