Abstract: The new technique on enzyme oxygen pretreatment of cotton fabric was investigated. Compared with the conventional alkali oxygen pretreatment, the new enzyme oxygen pretreatment could save 25.63% water , 33.77% steam, 9.82% electricity and save 32.70% standard coal, reduce 34.09% COD and the color of waste water was light. The whiteness, capillary effect, cottonseed shell removal rate, desizing rate and strength of the fabric with the new technique had met the desiration of semi-finished goods. The effects of hydrogen peroxide and NaOH on polyvinyl alcohol (PVA) in homogeneous solution were investigated. The result shows that NaOH had not any effect on the degradation of PVA besides sweling. However, after treated with H2O2 , PVA was degraded to small molecular organics and the molecular weight was less than 10,000. The amount of small molecular organics, molecular weight less than 1000, reached 55.6%. This enabled the subsequent treatment easy. The new technique has wide and potential application in the future in dyeing and finishing field.

Key words: pretreatment, bio-enzyme, cotton, hydrogen peroxide