Study On The Crease-resist And Antibiotic Finishing Of Silk

Silk has the excellent habilatory properties including the thin texture, better moisture absorption, graceful luster, soft hand feelings and keeping worm. However its shortcomings are the bad crease-resist ability and become yellow easily influenced by the ultraviolet radiation and salt. These will affect the habilatory properties and the use. It is adapt to generate multitude of microorganisms due to its protein fabrics. The research before mainly emphasis on the single finishing rather than adopting multiple finishing for silk. Managing silk not only from the aspect of crease-resist but from the aspect of antibiotic, the research try to improve both crease-resist and antibiotic properties on the base of not hurting the excellent characteristic of silk. In this thesis, constitution, properties of silk and crease reason of silk fabrics are reviewed. The development history of crease-resistance and antibiotic finishing is discussed. This thesis choose the first course of crease-resist finishing for silk through microwave irradiation to graft glycercl glycldyl ether on its surface and analyze the affection of irradiation time,irradiation power and concentration of compounds on its grafting ratio ,structure and physical properties. Then choose the second course of grafting chitocan to silk and analyze its antibiotic character and physical properties. First , the silk are grafted with glycercl glycldyl ether though microwave irradiation. Through orthogouality cross experiments the optimal technical procedures are revealed as follow: glycercl glycldyl ether concentration of 30% , microwave power of medium-low fire, irradiation time of 60 minutes, existing initiator. The properties of finishing silk are tested. The result show that quick crease recovery angle and slow crease recovery angle are improved, hand feeling become harder. Its strengths increase 5% higher than ordinary silk. With grafting ratio increasing, its strengths start to decrease. But rate of deceasing is not obvious in the gross, because microwave irradiation can accelerate structure adjustment of silk fibers reducing residual stress of high twisting silk dramatically. Through fourier transform infrared spectrum and amino phenol, glycercl glycldyl ether are actually grafted on silk and the reaction take place at the positive amino acid of which sides are containing -NH2,=NH,-OH and its quantity are large at non-crystal, instance for TYR and SER. In order to make silk get the properties of crease resistance and antibiotic ability , chitosan are applied to the silk grafted with glycercl glycldyl ether. Through orthogouality cross experiments, we draw the conclusion that ratio of absorption is low and concentration of glycercl glycldyl ether of 30%, microwave power of medium-low fire, irradiation time of 90 minutes, initiator of sodium chloride, concentration of chitosan of 0.5% , concentration of CH3COOH of 2%,molecular weight of 2500. The properties of finishing silk are tested and the result show: quick crease recovery angle reduce 10°and slow crease recovery angle reduce 2-3°. The strength of finishing silk and whiteness also decease. The finishing silk has a good antibacterial character to Staphlococcus aureus and Escherichis coli. The ratios of antibiotic are more than 90%. Glycercl glycldyl ether and chitosan are both grafted on silk and make the chemical structure and constitution of silk molecules change. The multiple procedure finishing of silk has better physical properties and antibiotic character compared with the silk which has crease resistance and antibiotic ability only though grafted with chitosan.