The Preparation And Properties Research Of Collagen/Cotton Close Skin Fabric

Cotton fabric is the most widely used wearing material nowadays, which possesses manyadvantages such as eco-friendly and comfortable to wear. As the living standards continuallydeveloping, features like good-looking and fashion are not enough for a suit, and the cottonfiber clothing fails to satisfy the high consumption crowd and the special crowd, peopledemand for more in health, eco-protection as well as moisturizing. The skin-moisturizing,warm-keeping and anti-itch underwear strongly attracts consumers in the cold-dried winter.Collagen, or active collagen, is a kind of protein extracted directly from living organism.Comparing to denatured collagen where the screw structure and the peptide chain of collagenhave been destroyed, the triple helical structures of collagen protein are maintained well innative collagen. Collagen is medically proved to be cell growth promoted and not harmful forhuman body. Abilities such as skin wounds reparability, antiallergic effect, water maintenanceand anti-uv properties, make collagen widely used in health care, beauty culture and medicine.Recently, clothing applications becomes a new application trend for collagen.Collagen will be denatured when heated over some certain temperature, so as to losemany advantages and the value in cotton fabric modification. However, the conventionalchemical cross-linking reaction between collagen and cellulose were carried out under hightemperature and with cross-linking reagent existing. In order to solve this problem, twosteps’ reaction of collagen and cellulose crosslinking was adopted in this thesis. Firstly, thecross-linking reagent was grafted on to the cotton fabric at a relatively high temperature, andthen the product was treated with collagen at a temperature lower than the denaturing value.For the first step, two methods-solution and baking-were used in this thesis. For the solutionmethod, the cotton fabric was immersed into the solution of the cross-linking reagent with arelative high temperature. For the baking method, the fabric was finished through a doubleimmersing-rolling-baking cycle.In this thesis, the effects of charging rate as well as the reaction conditions of the twocross-linking reagent conjugating methods for product properties were studied. DSC, SEM,FT-IR and TG were used to analysis the product structure and properties. It was found that the fibers and blanks of cotton fabric were covered and filled with collagen fiber membrane; thecollagen in the product was bounded to the cotton fabric tightly without denaturing. Theproperty of active collagen modified cotton fabric was found to be better than that of thedenatured collagen modified one in water maintenance and anti-uv property, and physicaladsorption in washability.In this study, the optimum process conditions of the solution method were investigated.In the first step, glutaraldehyde-cotton fiber conjugation temperature was set to be60°C, theconcentration of glutaraldehyde was1.25%(v/v), reaction time was1.5h. In the second step,collagen modification temperature was room temperature, the concentration of collagen was4.5%(v/v), reaction time was42h. The product prepared under these conditions contained6.21wt%of collagen. The optimum process conditions of the baking method as follows. Inthe first step, glutaraldehyde-cotton fiber conjugation temperature was set to be155°C, theconcentration of glutaraldehyde was2.5%(v/v), reaction time was2.5min. In the second step,collagen modification temperature was room temperature, the concentration of collagen was3.5%(v/v), reaction time was42h. The product prepared under these conditions contained4.9wt%of collagen. After being washed20times, the collagen content remained76.3%. Inthe hygroscopicity tests, the water absorption rate reached319.2%, drip diffusion time was2.1s, and the wicking height reached207mm. The moisture retention tests results showedthat, the rate of evaporation was0.11g/h,35.5%lower than cotton fiber. In the anti-ultraviolettest, it was found that the UPF value was76.7, and T(UVA) was3.43%, which satisfied thedemands of anti-ultraviolet products. Furthermore, the mechanic properties and thermalinsulation properties met different degrees of improvement after modification, without greatchanges in whiteness and wrinkle resistance.