| Silk is a natural protein fiber,because of its unique luster,good drapiness,soft and smooth feel and other excellent characteristics,so the study on the functional silk fabric can meet the growing needs of people for a better life.The functional modification methods of traditional silk fabrics have many disadvantages,such as environmental pollution,energy consumption and tedious process.The ecological and environmental protection concept of"Lucian waters and lush mountains are invaluable assets"has been deeply rooted in the hearts of the people.The research on environmentally friendly and efficient processing and modification methods of silk has certain research significance and practical value.The conventional modification of silk fibers usually uses organic solvents to improve the reaction efficiency,while water as the carrier of the reaction is more and more popular.In the first part of this paper,water-soluble carboxylated chitosan（CMC）and 2,3-epoxy-propyl trimethyl ammonium chloride（GTA）were used as raw materials for chemical modification of real silk fabric（SF）by series reaction.CMC can provide more reaction sites for GTA,while GTA can help stabilize CMC and make up for its deficiency in function.The morphology,structure and physicochemical properties of SF,SF-CMC,SF-GTA and SF-CMC-GTA samples were compared and analyzed.The results show that the reaction can be carried out successfully in aqueous solvent at 80℃.The zeta potential of SF-CMC-GTA（1.5m V）was significantly increased compared with that of SF（-26.3m V）,and the highest permeability and water absorption were 272.25 g·m-2·d-1and 326.53%,respectively.The antibacterial effect of SF-CMC-GTA was the most obvious,the antibacterial rate of S.aureus and E.coli were both above 99.99%,and the staining rate was 55 times higher than that of SF.The properties of silk fabric modified by series reaction are excellent.The reaction is carried out in water solvent and the condition is mild,avoiding the use of organic solvent.The series reaction can make up for the low efficiency of aqueous solvent reaction and provide a feasible technical path for the green functional modification of silk fabrics.Water has gradually evolved into a precious resource.In order to further reduce the use of water resources,the second part of the paper uses the low eutectic solvent（DES）composed of betaine（Bet）and lactic acid（LA）as the reaction solvent,and at the same time as the reaction raw material.The real silk fabric is modified by microwave heating method,and the advantages of microwave heating over traditional heating methods are studied.The morphology,structure and dyeing properties of the samples were analyzed.The results show that:DES can be successfully used to modify the reaction carrier and raw material of real silk fabrics.The reaction efficiency of microwave heating is significantly increased compared with that of traditional heating.At the same time,the surface charge of the modified real silk fabric is increased from-26.35m V to+5.57m V due to the introduction of Bet molecules,and the modification has no obvious effect on the physical and chemical properties of real silk fabrics such as water absorption,tensile strength and micro-morphology.The dyeing performance of real silk fabric modified by microwave assisted DES was greatly improved,the dyeing rate increased 58 times from 1.37%to 79.53%,and the optimal dyeing process was explored:Na2CO3concentration 2 g/L,dyeing temperature 50℃,dyeing time 80 min.The value of K/S increased from 0.0746 to 4.0711.DES used in silk fabric modification can achieve no water discharge effect,significantly reduce the waste of water resources,further promote the green development of silk fabric printing and dyeing industry. |
