• Categories:Industry news
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• Time of issue:2020-12-23 10:16

(Summary description)Whiteness and wool effect Poor whiteness includes impure whiteness, non-uniform whiteness and less than 8-10cm / 30min gross efficiency, which is related to the quality of grey knitted fabric. For example, the content of low-grade cotton is high, so it is difficult to do well in whiteness and gross efficiency. Of course, the key is the process formulation and the selection of auxiliaries. resolvent In the process development: ① Choose a good scouring agent: The comprehensive effects of scouring agent, such as cleaning, emulsifying, dispersing and penetrating, must be good to ensure the removal of impurities, whiteness and gross effect. However, the quality of scouring agents in the market is uneven. We must choose products with good comprehensive effects instead of only measuring the permeability and solid content. The permeability is only one aspect to be considered. ② Oxygen bleaching stabilizer and chelating dispersant: These two auxiliaries are mainly used to improve water quality, absorb and complex metal ions such as iron ions in water, so as to prevent metal ions from catalyzing the rapid and ineffective decomposition of hydrogen peroxide. If hydrogen peroxide is rapidly and effectively decomposed, its whiteness and wool effect can not meet the requirements, and at the same time, it will cause fabric brittleness and even holes. Therefore, to achieve whiteness and wool effect, the oxygen bleaching stabilizer should choose a good variety The decomposition rate of hydrogen peroxide should be considered in the selection. The addition of chelating dispersant can not only chelate iron, but also chelate various impurities in the water, so that these impurities will not contaminate the fabric again, resulting in whiteness, dark and gray. Therefore, chelating dispersant should not only consider its chelating force on metal ions, but also its dispersing force. ③ Process conditions: It takes a certain time and temperature for additives to react with impurities. If the conditions are not met, the pigment and impurities will not be removed completely, and the whiteness and wool effect will not be achieved. ④ Washing: Washing after scouring and bleaching is very important. The impurities removed should be cleaned to ensure whiteness and wool effect.