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Research on alkaline hydrolysis-aging of silk fabrics coated with Chinese lacquer

WANG Li-bing1,LIU Hui2,TU Heng-xian2(1.College of Textile and Clothing,Qingdao University,Qingdao,Shandong 266071,China2.College of Textiles,Donghua University,Shanghai 200051,China)  
Coating silk fabrics with lacquer is a traditional way of fabric processing to make stiff,waterproof,and durable fabrics.Research on aging performance of lacquer coated fabrics will be helpful to the excavation,conservation and display of ancient lacquered silk fabrics.In this paper,alkaline hydrolysis aging performance of lacquer coated silk fabrics were tested and analyzed.Three kinds of samples: silk fabric,silk fabrics coated with lacquer and with lacquer mixed with 15% tung oil,were artificially aged by alkaline hydrolysis and their tensile strength and rate of elongation were measured.In the beginning period of aging,losses of tensile strength and rate of elongation of the 3 kinds of fabrics are almost equally acute.During longer aging time,resistance to alkaline hydrolysis aging of the two kinds of lacquer coated silk fabrics were lower than that of silk fabric,lacquer-tung oil fabrics being the lowest.Electron microscope observations showed that many cracks appeared on both two kinds of lacquer films,and many tiny holes emerged on lacquer-tung oil films.According to X-ray diffraction determination,damaged lacquer films lose their protection on silk and the crystallinity degree of silk decreases significantly.The combination of weaker silks and lower strength fragile lacquer films presents poorer tensile and elongation performance than silk fabric.In conclusion,the two kinds of lacquer coated silk fabrics are both poor in aging resistance,inferior to silk fabrics.Comparatively,pure lacquered silk fabrics are a little better than tung-oil lacquered silk fabrics in anti hydrolysis aging.
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