科研之友
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摘要
A new commercial bio-bleaching process for cellulose fibres was investigated in this study. The process runs enzymatically with arylesterase enzymes (EC 3.1.1.2) and hydrogen peroxide. The enzyme system catalyses the perhydrolysis of propylene glycol diacetate. During the reaction propylene glycol and peracetic acid as a bleaching agent are formed in situ. The main advantage of the bleaching with peracetic acid is that a satisfactory degree of whiteness of a cotton fabric can be obtained at 65 degrees C at a neutral pH. The bleaching performance of the new bio-bleaching process on a traditionally alkaline-scoured and bin-scoured 100 % cotton fabric and the feasibility of a one-bath bio-scouring/bio-bleaching pre-treatment were investigated. The whiteness degrees, tenacities at maximum loads and water absorbencies of the treated cotton fabrics were compared. The hydrogen peroxide and peracetic acid concentrations, pH and TOC values of the remaining treatment solutions were measured. The research showed that the new bio-bleaching system has a powerful bleaching ability under mild process conditions and that bio-scouring and bio-bleaching can be efficiently combined in a one-bath process.
- 出版日期2013-8
