Dyeing performance of silica sol hybridized with Direct Red 4BS

A silica sol was prepared with TEOS,GPTMS,EtOH,H2O and HCl.The Direct Red 4BS was doped into this sol and formed a Direct Red 4BS contained hybrid silica sol.The dyeing proformance of Direct Red 4BS contained hybrid silica sol(Ⅰ) was investigated and compared with that of Direct Red 4BS alone but followed by a fixing process with fixing agent(process Ⅱ).The results showed that when compared with(Ⅱ),(Ⅰ) which used Direct Red 4BS contained hybrid silica sol containing silica sol 40%,NaCl 10 g /L and baking temperature 150 ℃ for 5 min exhibited enhancement in K /S value by 11.1%,raise in dry and wet rubbing fastnesses by one grade respectively,and improvement in color fastness(fading) and color fastness(staining) by half grade respectively.Compared with the untreated fabric,the fabric dyed with(Ⅰ) has better breaking strength(warp-wise increased by 11.6%),better bending rigidity and bending hysteresis moment,but slightly lowered hand feeling.From SEM image,a silica film on the surface of the dyed fiber was clearly observed.