Investigation Of The Cotton Fabric Pretreatment Processes Using Enzyme

In this thesis, cotton fabric pretreatment technologies by using a series of enzymes were reviewed. The present situation and development of enzymes and their using technologies were also studied. The principles of the enzyme, the factors of the enzyme activation were discussed. The structure and chemistry composition of the cotton were involved. The suitable cotton fabric pretreatment technologies were obtained by means of measuring some fabric properties such as capillarity, whiteness, and strength.The cotton pretreatment technology of enzymes in bath is one of the key points in the paper. Baisheng enzyme and hydrogen peroxide could be conducted in one bath. Pretreated in this way, the fabric strength is better without the loss of enzyme activation.The technological process: first, preparing the de-sizing solution →putting a cloth sample →shake at constant temperature of 60℃ for 45min →washing →drying; second, preparing the scouring and bleaching solution →putting a cloth sample→ shaking at constant temperature of 95℃ for 60min →washing →drying. The technological recipe: amylase A 0.8g/L and pectinase A 1.5g/L hydrogen peroxide 8g/mL.The cotton pretreatment technology of enzymes by steaming in one step is the aim of dying and finishing exporters. De-sizing, boiling and bleaching of cotton by using L40, Baisheng enzyme, hydrogen peroxide could be conducted in one step by steaming, which is the key point in this paper.The technological process: preparing the bath →two dipping androlling of pick-up 100%→ 100℃ steaming, 40 min,→washing →drying. The technological recipe: amylase A 0.8g/L and pectinase A Ig/L hydrogen peroxide 8g/mLThe cotton pretreatment technology of enzymes by unsaturated steaming is a new try. Cotton fabric pretreatment can be done in succession process using mid-temperature enzyme. The result has laid a good foundation of the development of the continuous process.The dying properties of fabrics pretreated by the traditional and the above discussed technologies were compared with the help of C. I. direct blue 1,C. I. direct red 80,C. I. Direct yellow 26 in shallow, medium, dark concentrations. The dye-uptake and K/S values are tested.