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Enzymatic Removal of Non-cellulose Impurities on Cotton Fabric and Its Application in Textile Process

Author: YanHeJing
Tutor: DuGuoCheng
School: Jiangnan University
Course: Fermentation Engineering
Keywords: Cotton fabric Enzymatic scouring Alkali scouring Catalytic efficiency Non-cellulosic impurities Cottonseed hull
CLC: TS195
Type: PhD thesis
Year: 2009
Downloads: 259
Quote: 4
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Abstract

Scouring of cotton fabric enzyme to degrade non-cellulosic impurities in the cotton fiber in order to achieve the removal of their purpose is to make use of the catalytic specificity of the enzyme preparation. The role of the process under mild conditions, the consumption of energy-saving and environment-friendly, ideal alternative processes is widely recognized as the cotton fabric alkali scouring process. However, the enzyme scouring of cotton fabric in the non-cellulosic impurities such as wax and pectin, especially the removal of the cotton shell than alkali scouring process, which has become a cotton fabric enzyme scouring the biggest obstacle to large-scale industrial applications world. This thesis is to improve cotton fabric enzyme scouring the non-cellulose impurities especially cotton seed hull removal efficiency as the goal, detailed analysis of the the cottonseed hull structure and chemical composition of the cutinase cotton shell degradation and other enzymes preparations synergy mechanism found an important factor to affect the enzyme preparation catalytic efficiency of the enzyme scouring of cotton fabric, and discussed the influence mechanism; enzyme scouring and bleaching of cotton fabrics on the basis of a bath treatment new strategy of non-cellulosic impurities of the cotton fabric cotton shell ideal removal. The main findings are as follows: 1. Fourier transform infrared microscopic scanning technology cottonseed hull structure, chemical composition and its distribution were analyzed, screened on the basis of four enzyme preparations cottonseed hull significant degradation - alkaline cellulase, xylanase, fungal cutinase and pectinase. The removal rate of 10.66% cottonseed hulls of four of the enzyme preparation used in the enzyme scouring of cotton fabric, cotton fabric obtained by treating in their preferred dosage. Compared with the two commodities scouring enzyme preparation obtained 4.72% and 8.67%, cotton seed hull removal rate has increased, but much lower than the base scouring 40.33% cottonseed hull removal. The cutinase the cottonseed hull outer cortex horny degradation. The cutinase degradation horny in addition to cotton seed hull lipids of the epidermis to eliminate the obstacles of the enzyme protein to penetrate inside the cotton seed hull, cotton seed hull on the adsorption capacity of the enzyme preparation. After cutinase processing the adsorption amount of the alkaline xylanases, cottonseed hulls increased 1.28 times. Thereby facilitating other enzyme preparations degradation of cotton seed hull, the the cutinase other enzyme preparations in the degradation of cotton seed hull synergy. Cutinase common cotton hulls processing, xylanase and the alkaline pectinase treatment increased the amount of reducing sugars produced in the liquid 800μg and 1270μg, and the loss rate of the sample increased by 7.18% and 6.29%, respectively . Temperature xylanase degradation of the impact of the cotton seed hull, is an important factor to affect the efficiency of enzymatic. Cotton shell with xylanase degradation curve fitting, the best equation. This equation can be drawn at different temperatures under different conversion rate xylanase cotton shell catalytic rate. The results show that the catalytic rate xylanase cotton shell at higher temperatures (55-65 ° C) the catalytic rate much higher than the low temperature (30-45 ° C). The same time within a certain temperature range, the temperature to remove the wax from the fabric cutinase the alkaline pectinase to remove pectin and alkaline cellulase to remove the cotton hulls have the same impact, the higher the temperature, i.e. when the enzymatic treatment of cotton The higher the fabric of non-cellulose impurities removal. 4 enzyme catalytic efficiency of removal of the wax are closely related. The higher the temperature, the more the dissolution and loss of coverage in the outermost layer of cotton fibers the waxy (free waxy), the role of the sample enzyme preparation sites exposed more, thus increasing the enzyme protein adsorbed onto cotton fabric The quantity of this may be important reason for improving the catalytic efficiency of the enzyme preparation at higher temperatures. According to the above study, temperature control strategies to improve the removal of the enzyme scouring of cotton fabric, wax and other non-cellulosic impurities. Temperature control strategy (compared with 55 ° C enzyme scouring) wax, pectin and cotton seed hull removal rate of 75.37% (59.83%), 85.33% (79.80%) and 14.87% (10.66%). The application of low-temperature activator (TAED) implementation of the enzyme scouring and bleaching of cotton fabric one-bath treatment (H ₂ O ₂ / TAED system) strategy can effectively improve the cotton fabric Africa cellulose impurities, especially cotton shell removal. When the enzyme scouring joined H _{, 2} O ₂ treatment of cotton fabrics, low temperature the H ₂ O ₂ oxidation conducive to the removal of the wax, pectin and cotton hulls, especially the oxidation of cotton hulls, bleaching action, so that the removal rate of the enzyme scouring stage cottonseed hulls greatly improved, compared to the conventional enzyme scouring 25.13%. H ₂ O ₂ / TAED bleaching one-bath system used in the enzyme scouring and bleaching of cotton fabric, wax, pectin and cotton seed hull removal rates removal of 92.27%, 87.35% and 88.06%, with alkali scouring and bleaching 95.66%, 89.57% and 90.33%, the effect is quite.

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