Effect of UV-induced photografting on the dyeability of Madder dye
The coupling agent γ-methylacryloxy propyl trimethoxysilane(KH-570)and nano-zinc oxide(ZnO)are grafted onto the surface of cotton fabric by UV photografting technology.Nano-zinc oxide is used as a mordant to dye cotton fabric with natural madder dyes at room temperature without salt addition.The influences of coupling agent concentration,photo sensitive initiator concentration,UV irradiation energy and dye concentration on the dyeability of cotton fabrics are discussed.The surface morphology and structure of cotton fabric before and after dyeing are characterized by FTIR,SEM,EDS and XPS.The results show that when the mass fraction of coupling agent KH-570 is 3％,the mass fraction of photosensitive initiator is 3％,the UV irradiation energy is 15 J/cm2,and dye concentration is 25％,the dyeing depth K/S value of cotton fabric could reach 8.32,the color fastness to soaping is level 4,and the color fastness to dry and wet rubbing is level 5 and 4～5,respectively.
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