Synthesis Of Three Kinds Of Modified Tea Polyphenols And Their Dyeing And Finishing Properties Research

Tea polyphenols,TP,is a natural material extracted from Camellia sinensis.TP is widely applied in food and medicine for its biomedical properties,such as antibacterial,anti-ultraviolet,anti-oxidative,anti-tumour,anti-inflammation and deodorization,etc.People pay much attention to natural dyes because of the improvement of living standard and awareness of health and environment.The fabric dyed with TP is given soft color and some special properties.But as many natural dyes,the dyeing drawbacks of TP limit its widely application.Therefore,the key to expand the application of TP is to find a suitable method to solve its dyeing drawbacks.In this paper,three kinds of modified TP were synthesized,and their dyeing application in silk and cotton were also investigated.Three kinds of modified TP were synthesized with dizao-coupling reaction.The polyphenol content of modified TP remained same level with unmodified TP.The modified method had no effect on hydroxyl.Compared with the UV spectrum of four kinds of TP,it was found that TP and three modified TP were more stable in acid or neutral condition.The optimum dyeing process of three modified on silk and cotton were obtained from single factor experiments.The color depth and UV protection of fabric dyed with three kinds of TP could be both improved.The color fastness of dyed silk and cotton were improved by modified TP.NTP could improve the fanstness to light of dyed fabric.HTP and FTP had much effect on rubbing fastness and wash fastness of dyed fabrics.Three kinds of modified TP had good inhibition of golden yellow staphylococcus aureus and escherichia coli.The antibacterial rate of escherichia coli was higher than that of golden yellow staphylococcus aureus,in the case of the same modified TP.