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.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for scouring and bleaching cotton fabric with composite enzyme preparation in one bath, and belongs to the field of the application of alkaline enzyme preparations in scouring and bleaching process of cotton fabric.[0003]2. Related Art[0004]The conventional process for scouring and bleaching cotton fabric generally has the disadvantages of high temperature, high alkali, high pollution, and being not environmental friendly. The use of enzyme in scouring and bleaching cotton fabric in one bath has the advantages of mild processing conditions, low fabric damage, low power consumption, being environment friendly, and short process flow. The use of enzyme in scouring and bleaching cotton fabric in one bath, by adopting a preferable composite enzyme preparation and optimizing the process conditions, is a topic of practical significance that keeps close contact with actual production a...

AI Technical Summary

Benefits of technology

[0005]The present invention is directed to a method for scouring and bleaching cotton fabric with a composite enzyme preparation, in order to solve the problems of high power consumption and high pollution in the current chemical pre-treatment method of cotton fabric, without severe damage on the fabric, while shortening the process flow.

[0007]1) Cotton fabric is scoured with a composite enzyme preparation. The scouring enzyme preparation is compounded from cutinase, alkaline pectase, alkaline xylanase, alkaline cellulose, and carbohydrate oxidase. The scouring bath composition includes: the composite enzyme preparation 0.5-1.5 g / L, penetrant WC (Jiangsu Hai'an Petrochemical Plant) 1-5 g / L, glucose 1.5-3 g / L, oxidation bleaching stabilizer RB-3 (Jiangsu Yixing Jiayu Chemical Plant) 3 g / L, and Triton X-100 0.5-1 g / L. The process 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. 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%. Enzymatic scouring of cotton fabric under alkaline condition facilitates the removal of impurities in the cotton fiber and the performance of bleaching process. Alkaline pectase and cutinase can cooperate to effectively remove hydrophobic impurities (for example, wax and pectin) on the surface of the cotton fiber, thereby improving the wettability of the fabric. Alkaline xylanase and alkaline cellulose can effectively degrade the cotton seed hull on the cotton fabric, and alkaline xylanase can promote the improvement of the whiteness of fabric and thus reduce the amount of H2O2 required by the bleaching process. H2O2 is generated by carbohydrate oxidase in the scouring bath with glucose as substrate. Under this scouring condition, H2O2 has weak degradation effect on the impurities on the surface of the fiber, and can improve the accessibility of alkaline pectase, cutinase, alkaline xylanase on their respective substrates, thereby accelerating the catalytic effect of the enzymes. The treatment effect of the present invention can meet the processing requirements of subsequent process, thus avoiding concentrated alkali and high temperature in the chemical treatment method, with low power consumption and being environment friendly.

[0008]2) The cotton fabric after scouring is bleached in the same bath. After scouring, tetraacetyl ethylenediamine (TAED, Henan Hongye Chemical Co., Ltd.) 0.5-2 g / L is directly added into the scouring bath. The processing conditions are: pH 10, temperature 55-70° C., and processing time 30 min. H2O2 is generated by carbohydrate oxidase with glucose as substrate to bleach the cotton fabric, thus no additional H2O2 is needed. The whiteness of the treated fabric can meet the requirements of the subsequent process. Tetraacetyl ethylenediamine (TAED), as an activator of H2O2, can effectively activate H2O2 at a low temperature, to enhance the oxidation capacity of H2O2, thereby improving the whiteness of the fabric and shortening the bleaching time.

[0009]The beneficial effect of the present invention is that cotton fabric is scoured and bleached with a composite enzyme preparation in one bath. The scouring enzyme preparation is compounded from cutinase, alkaline pectase, alkaline xylanase, alkaline cellulose, and carbohydrate oxidase. When scouring and bleaching cotton fabric with the composite enzyme preparation in one bath, the processing conditions are mild, no damage on the fabric is caused, and at the same time, the power consumption is low and the process is environment friendly, and the fabric can meet the processing requirements of subsequent process. When scouring the cotton fabric with the composite enzyme under alkaline condition, alkaline pectase and cutinase can cooperate to effectively remove the pectin and wax on the surface of the fiber, thereby improving the wettability of the fabric. Alkaline cellulose and alkaline xylanase can degrade the cotton seed hull on the cotton fabric. Meanwhile, alkaline xylanase has bleaching effect on the fabric and thus can decrease the working load of H2O2 bleaching. H2O2 for bleaching is generated by carbohydrate oxidase in the scouring bath with glucose as substrate. Under the scouring condition, the oxidation effect of H2O2 can further promote the effect of alkaline pectase, alkaline cellulose, and alkaline xylanase on the substrates, thereby significantly improving the removal effect of the enzymes on the impurities in the fabric. Therefore, by compounding the several enzymes to scour and bleaching cotton fabric in one bath, the wettability, removal ratio of impurities, and whiteness of the obtained fabric are equivalent to that of the fabric treated by the conventional chemical method, but no damage on the fabric is caused, and the process is environment friendly. H2O2 can be generated by carbohydrate oxidase with glucose or other oligosaccharide as substrate for bleaching the fabric, thus no additional H2O2 is required to be added in the bleaching bath, and the whiteness of the cotton fabric can meet the processing requirement of the subsequent process. Due to the advantages of low power consumption and being environment friendly, the process of enzymatic scouring and bleaching cotton fabric in one bath is an ideal method to replace the conventional chemical treatment method.

Problems solved by technology

The conventional process for scouring and bleaching cotton fabric generally has the disadvantages of high temperature, high alkali, high pollution, and being not environmental friendly.