Enzyme application in desizing analysis of pure cotton fabrics
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Pure cotton fabric desizing amylase fabric textile fabric
1) The effect of amylase on fabric desizing is manifested in the desizing rate. When the enzyme concentration is very small, the effect of amylase on fabric desizing is The desizing rate increases with the increase of concentration, and the desizing rate is directly proportional to the enzyme concentration. However, when the enzyme concentration exceeds a certain amount, the desizing rate will deviate from the straight line and become flat as the enzyme concentration increases. This amount is the more appropriate concentration of amylase in enzyme desizing.
2) When the temperature at which amylase acts on the fabric is very low, the desizing rate will gradually increase as the temperature increases. When reaching a certain temperature, the desizing rate reaches a maximum value. After that, if the temperature is raised again, the desizing rate will decrease. This temperature is the most suitable temperature for enzyme desizing.
3) The effect of amylase on desizing fabrics will change with the change of pH. At a certain pH value, the catalytic effect of the enzyme is stronger. , which shows a better desizing effect on fabrics. This pH value is called the optimal pH value for enzymatic desizing. Above or below this pH value, the desizing effect of the enzyme will be reduced.
4) The metal salt NaCl activates the catalytic effect of the enzyme. The addition of NaCl will improve the desizing effect of the enzyme on the fabric. When the NaCl concentration is very small, the desizing rate increases significantly with the increase of the NaCl concentration. When the NaCl concentration reaches a certain amount, the desizing rate no longer increases significantly with the increase of the concentration. This concentration is the appropriate concentration for adding NaCl. .
5) The addition of penetrant can improve the catalytic effect of the enzyme, which is manifested as an increase in the desizing rate of the fabric. However, when the penetrant is higher than a certain amount, The desizing rate of the fabric decreases instead, and this amount is the appropriate concentration for adding penetrant.
6) After immersing the fabric in the enzyme solution, only by keeping it warm and stacked for a period of time can the enzyme fully act on the fabric and achieve ideal desizing. Effect. As the stacking time increases, the enzyme’s catalytic effect on the fabric becomes more complete. However, when the stacking time reaches a certain period, the desizing effect does not improve significantly as time continues to pass.
7) For fabrics sized with modified starch and acrylic mixed sizing, the optimized desizing process is: fabric – soaking in warm water – soaking in enzyme Liquid, heat preservation, stacking, hot water washing, cold water washing and drying.
8) The optimization process of amylase desizing can basically achieve the effect of traditional caustic soda desizing on cotton fabrics. The desizing rate, moisturizing rate and The wetness and wool effect are close to those of traditional alkali desizing indicators, and the whiteness is lower than that of alkali desizing fabrics. Enzyme desizing has no effect on the fabric. There is almost no loss of fabric strength after desizing, and the fabric feels soft.
9) The amylase desizing process has the advantages of mild conditions, low dosage, high efficiency, and little loss to fabrics. As an ecological protein, amylase has no toxicity and is harmless to the human body. The COD value of the desizing waste liquid is small, it has good biodegradability and has little environmental pollution.
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