Chemical pre-treatment of wool

◆Wool pre-treatment of raw wool contains a large number of impurities: natural impurities: sheep fat sheep sweat Additional impurities: vegetable impurities, dust, pigment raw wool before spinning by washing wool, charring, bleaching and other processes wool, yarn or fabric before dyeing, washing it a, washing (refining): the purpose of the washing of wool?1, impurities characteristics: sheep fat: high-level fatty acids and cholesterol combined with esters and a small amount of free alcohol fatty acids. 2, wool characteristics: not resistant to alkali, especially at high temperatures, serious damage will occur. 3, wool characteristics: weak alkaline conditions: medium temperature, especially at high temperature. Sheep sweat: potassium salt of fatty acids, sand 2, wool characteristics: alkali intolerance, especially at high temperatures, serious damage will occur. 3, washing wool: weak alkali conditions: medium temperature, emulsification method method: soap alkali method: soap + Na2CO3 Dosage Soap 2-4% Na2CO3 2% (on the original weight of the wool) Temperature 50 ° C pH = 8-9 time 10-20min washing quality measurement: fat content rate 1.2% equipment : rake type wool washing machine four tanks first tank second tank third tank fourth tank single Na2CO3 liquid alkali soap liquid water washing water washing sheep fat can be recycled two, the purpose of charcoal charcoal? 1, the removal of plant impurities principle: strong inorganic acid: cellulose hydrolysis wool is not significantly impaired 2, the method: loose wool charcoal charcoal wool charcoal strip charcoal strip charcoal 3, loose wool charcoal charcoal process soak water dewatering acid deacidification and drying rolled charcoal (loose wool) mechanical dedusting Clear water washing, neutralization and drying three, bleaching on the whiteness requirements of high white fabrics and other bleaching general dyeing with straight dyeing without bleaching process: dip H2O2 bleaching liquid cleaning bleaching wool bleaching powder bleaching cleaning