Composite bleaching agent for cotton fabric

Abstract

The invention discloses a composite bleaching agent for cotton fabric, which comprises the following components in parts by weight: 6-8 parts of sodium hypochlorite, 3-5 parts of sodium silicate, 10-20 parts of trisodium phosphate, 8-15 parts of sodium pyrophosphate, 10-20 parts of hexamine and 200-400 parts of water. Compared with the prior art, the agent has the benefits that: 1, the bleaching effect is good, the whiteness is high, the agent is white, bright and translucent, and good in hand feeling, and has small damage to fibers; 2, the agent has functions of desizing and boiling, can interact with and dissolve impurities such as cottonseed hulls and a pectic substance with low molecular weight, and has lower requirements on pretreatment; and 3, the agent is wide in application scope, and can greatly reduce the influence of metal ions on the bleaching effect since a complexing agent is added to a formula.

Description

technical field [0001] The invention belongs to the technical field of textile auxiliaries, and more specifically relates to a composite bleaching agent for cotton fabrics. Background technique [0002] After the cotton fabric is scoured, the impurities are obviously reduced, and the water absorption is greatly improved. However, due to the presence of natural pigments on the fibers, its appearance is not white enough. Except for a few varieties, bleaching is generally required, otherwise it will affect the dyeing. The vividness of printing color. The purpose of bleaching is to destroy the pigments and impart the necessary and stable whiteness to the fabric without appreciable loss of fibers. [0003] Now commonly used cotton fabric bleaching agents are hydrogen peroxide and sodium hypochlorite, but these bleaching agents have certain limitations in use, such as hydrogen peroxide solution under alkaline conditions, its stability is relatively poor, some metal cations such a...

AI Technical Summary

Problems solved by technology

[0003] Now commonly used cotton fabric bleaching agents are hydrogen peroxide and sodium hypochlorite, but these bleaching agents have certain limitations in use, such as hydrogen peroxide solution under alkaline conditions, its stability is relatively poor, some metal cations such as copper ions, iron ions etc., all have a catalytic effect on the decomposition of hydrogen peroxide

Similarly, many metals or heavy metal compounds can catalyze the decomposition of sodium hypochlorite, which will also damage the fibers; in addition, sodium hypochlorite bleaching should avoid direct sunlight, otherwise decomposition will occur, resulting in fiber damage