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Reaction kinetics study of α-amylase in the hydrolysis of starch size on cotton fabrics

The hydrolysis reaction kinetics of α-amylase on the starch size of cotton fabrics followed the first-order reaction in the initial stage that α-amylase hydrolyzed on the surface of cotton fabrics; desizing ratios of more than 95% were obtained in the initial stage, which are acceptable, and the hydrolysis time for the initial stage shortened sharply as the temperature increased. The increase of α-amylase dosage enhanced the reaction rate constant as well as speeded up the first-order reaction rate in the initial stage, both treated at the same treatment temperature. The hydrolysis action of α-amylase on starch size on the surface of cotton fabrics speeded up significantly as the temperature increased. Also, the treatment time needed to obtain an acceptable desizing ratio (> 95%) shortened sharply from 6 to 1/12 h as the treatment temperature increased from 20 to 100 °C.