Keywords: cheese, dispersing agent, scouring
Enzyme as a pre-treatment of biological agent can not only reduce pollution, but some are not suitable for high temperature, liquor ratio, prolonged heat treatment of fibers (eg, spandex), has its unique advantages. Domestic and foreign manufacturers have introduced more than a lot of enzyme, also has the relevant enzyme mixture, together with related chelating agents, made simple and easy to Sichuan goods enzyme pretreatment agent, according to available information, there can be used for large-scale production :
(1) alkaline pectinase: General pectinase play a role in acid medium, refined results than the traditional process. 20th century 90s Novozymes has successfully isolated for alkaline pectinase scouring of cotton using mild conditions (temperature = 55 ℃, pH = 9.5), good stability, will not damage cotton fiber factors, and therefore did not fall nearly strong, it has two series:
① Bioprep: a genetically modified bacillus microbial enzymes made by fermentation, it can remove the primary cell wall of cotton fiber pectin small, so the mountain dew in the subsequent hot wax cotton is easy to be cleaned improve the fiber wetting, has been dealing with the yarn soft and good memories, and to maintain a high strength, capillary effect and the conventional process quite, but less whiteness, cottonseed hull big addition is not ideal.
② Scourzyme L: is the company in 2003, Novozymes push 8: alkaline pectinase can be used for cotton, flax, hemp and blended yarn of 10 objects refining, the process is named Bio-Scouting (bio-scouring) , compared with the traditional process, clean water for at least a 50% reduction. Saving water and energy.
Handled a total of more moderate conditions: pH = 7.5-9.5, padding-inch temperature 30-4O ℃, impregnation (overflow) when 55-60 ℃.
③ Baylase EVO: Bayer Company introduced Baylase EVO cotton making full use of alkaline pectinase scouring agent of biological treatment, can be used for intermittent and continuous process, in order to obtain the best results can be added non-ionic surfactant.
(2) of the original pectinase (PPase): It is discovered by the El of the scholars, can catalyze the insoluble pectin, decomposition of the free water-soluble pectin, the enzymes of general. Its mechanism can be divided into A, B types. A-PPase cut pectin in polygalacturonic acid part, B-type PPase were decomposed polygalacturonic acid other than the part, so that free water-soluble pectin out by using experiment protopectinase (PPase) processed cotton yarn up to reveal the extent of fiber, refined effects and the same alkali refining.
(3) the commercialization of scouring enzyme: use of enzymes to facilitate the dyeing scouring the market has a lot of scouring enzyme by the compound can be used, but mainly for dyeing cotton fabrics for use in one bath desizing, scouring and bleaching including amylase.
① and Cleaning Division (Scolase 100T): Shanghai Research Institute of Textile Science, from biological enzyme and chelating dispersant composition of anionic powder solid, soluble in water at 50-60 ℃, 1% aqueous solution pH = 11 - 12, for cotton woven fabric pre-treatment design, in principle, pre-processing of cotton as long as the clear division with hydrogen peroxide added, you can at long last completed the withdrawal of cotton fabric scouring and bleaching triple continuous pre-treatment process.
Its mechanism is: 90 1 100 ℃, and Cleaning division Scolas. 100T, so that pectin, the rapid degradation of protein and by synergistic effect of hydrogen peroxide to remove cotton seed shell, so that impurities dissolved in hot water.
② scouring enzyme SKD: Everlight Chemical Co., Ltd. from Shanghai launched by Novozymes of genetically modified enzyme mix to be efficient, accurate and complete decomposition of cellulose of biology, applied to cotton, linen and The blended material before treatment, less fiber damage.
③ net cotton enzyme GXL: use of alkaloids, a variety of enzymes (pectinase, amylase and lipase enzymes), non-ionic surfactant, bio-chelating agent, metal complexing agents such as compound formed, one bath with hydrogen peroxide , do a continuous rolling steam pretreatment, capillary effect good (12-15cm/30min), good whiteness, cotton seed hull removal of the net, does not damage the fiber, integrated and low cost.
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