Study on anti-ultraviolet finishing of silk fabrics with waterborne dispersed nano-titanium dioxide slurry

Modification effect of silane coupling agent on nanometer TiO2 was strengthened by multi-hydroxyl compound as bridge group and well-dispersed high concentration nanometer slurry was obtained.The ultraviolet protective result of the waterborne dispersed slurry modified silk fabric was investigated and the finishing technology was optimized.The results showed that the dispersion modification effect of nanometer TiO2 using silane couple agent was improved evidently by multi-hydroxyl compound.Modified high concentration nanoTiO2 waterborne dispersed slurry had small size,even distribution and well-dispersed stability,the percentage of deposition is only 0.04% after four days even the concentration of the nano-TiO2 slurry was 100 g/L.The silk fabric treated by modified nano-TiO2 slurry showed strong and durable anti-UV properties.The optimum finishing technology was as follows: nano-TiO2 concentration 6 g/L,dipping time 30 min,pH 7,140 ℃ baked 3 min.The UPF value of silk fabric was increased from 7.52 of untreated silk to 69.52 of treated silk,and the UPF was still high to 61.47 after 50 times washing.