Antibacterial Finish Of Silk Fabric With Hyperbranched Polymerizable Quaternary Ammonium Salts HSDA-HTC

In the paper, antibacterial finish of silk fabric was carried out with an Hyperbranched polymerizable quaternary ammonium salts (HSDA-HTC) made by own laboratory. The feasibility of silk fabric modified with HSDA-HTC was investigated, which provided theoretical base for modification of silk fabric.The HSDA-NH2 was synthesized from methyl acrylate and diethylene triamine by polycondensation. Then the HSDA-HTC was synthesized from HSDA-NH2 and 2, 3-Epoxypropyltrimethylammonium chloride (GTMAC) as a grafting agent in aqueous solution. The extraction process was discussed, antibacterial properties and washfastness of the finished silk fabric were tested. Based on the experiments,this article arrives at the following conclusions:Firstly, The antimicrobial activity the HSDA-HTC aqueous solution was studied against Gram-negative bacteria E. coli and Gram-positive bacteria S. aureus. The minimum inhibitory concentration of the HSDA-HTC aqueous solution is about 50 ppm.The silk fabric was treated with HSDA-HTC aqueous solution by the impregnation method to provide it with antimicrobial properties. The antimicrobial activities of the HSDA-HTC treated silk fabrics were evaluated quantitatively. The results indicated that the HSDA-HTC treated silk fabric showed 99.33% of bacterial reduction to S. aureus and 99.13% of bacterial reduction to E. coli, respectively. The antimicrobial activities of the HSDA-HTC treated silk fabrics were maintained at over 99.00% reduction level even after being exposed to 50 consecutive home laundering conditions.Secondly, the silk fiber was treated with HSDA-HTC aqueous solution, the surface and internal structure of the silk fiber has little effect. The mechanical properties of the finished silk fabric have no noticed change compared with the silk fabric finished before; the moisture absorption of the finished silk fabric was improved a little.All these studies indicated that hyperbranched polymer(HSDA-HTC) can be applied to functional modification of silk. And these studies may widen the application fields of the hyperbranched polymer and provide a new idea for functional modification of silk fabrics.