Method for scouring and bleaching cotton fabric with composite enzyme preparation in one bath

Abstract

A method for scouring and bleaching cotton fabric with composite enzyme preparation in one bath is provided. The method relates to the application of composite alkaline enzyme preparation in scouring and bleaching processes of cotton fabric. The enzyme preparation for scouring and bleaching cotton fabric is compounded from cutinase, alkaline pectase, alkaline xylanase, alkaline cellulose, and carbohydrate oxidase. The method includes: scouring the cotton fabric by adding the composite enzyme preparation, glucose, oxidation bleaching stabilizer RB-3, penetrant JFC, and Triton X-100 in a treating bath at 55-70° C. and pH 8-10, and then bleaching the cotton fabric for 30 min by directly adding tetraacetyl ethylenediamine (TAED) in the scouring bath to activate hydrogen peroxide. After being treated by the method of the present invention, the cotton fabric has high impurity removal ratio, favorable wettability, and high whiteness. The present invention has the advantages of low power consumption, short process flow, and being environment friendly, and may be used to replace conventional chemical treatment process under the condition of concentrated alkali and high temperature.

1 . A method for scouring and bleaching cotton fabric with a composite enzyme preparation in one bath, comprising:
 1) scouring the cotton fabric with a composite enzyme preparation, wherein the scouring enzyme preparation is compounded with cutinase, alkaline pectase, alkaline xylanase, alkaline cellulose, and carbohydrate oxidase, the scouring bath composition comprises: the composite enzyme preparation 0.5-1.5 g/L, penetrant NC 1-5 g/L, glucose 1.5-3 g/L, oxidation bleaching stabilizer R8-3 3 g/L, and Triton X-100 0.5-1 g/L, the processing conditions are: the mass ratio of the cotton fabric and the scouring bath 1:20, pH 8-10, temperature 55-70° C., and processing time 60 min, and the mass percentages of the composite enzyme preparation are cutinase 10%-20%, alkaline pectase 20%-30%, alkaline xylanase 20%-30%, alkaline cellulose 5%-10%, and carbohydrate oxidase 15%-25%;   2) after scouring, bleaching the cotton fabric in the same bath, wherein tetraacetyl ethylenediamine 0.5-2 g/L is directly added into the scouring bath after scouring, and the bleaching conditions are: pH 10, temperature 55-70° C., and processing time 30 min.