Anti-UV Functional Finishing Of Cotton And Silk Fabrics With Nano-Powder Material

This thesis focus on enduing Anti-UV abilities of cotton and silk fabrics by UV-resistance functional finishing with UV blocking agents nano-TiO₂ and nano-ZnO power,and providing experimental proof to functional finishing of natural-fiber fabrics with nano-powder material.The thesis studied the influence of dispersant category and dosage to dispersion of nano-TiO₂, nano-ZnO and mixed nano-powder ZnO-TiO₂. UV-Vis, Laser Granularity Analyzer and TEM were employed to characterize the dispersion effect. The results showed that dispersion upgrade firstly and then slightly degrade as dispersant dosage increasing, PAAS gave better dispersion effect than (NaPO3)6 and PAAS & (NaPO3)6 binary dispersant (1:1wt).In the thesis, orthogonal experiments were adopted to study the anti-UV functional finishing of cotton with nano-TiO₂ and mixed nano-powder ZnO-TiO₂ (1:1wt). The results showed that the UPF of finished cotton fabrics were observably influenced by nano-powder concentration. The UPF raised as nano-powder concentration increased. The author took single factor experiments into consideration, received the optimal finishing conditions: nano-powder concentration, PEA adhesive concentration and baking temperature of nano-TiO₂ and mixed nano-powder ZnO-TiO₂ are 21g/L, 30g/L, 120℃and 24g/L, 45g/L, 120℃. Finished at the optimal finishing conditions, UPF of cotton fabrics respectively reached to 64.55 and 40.57. After washing 50 times, the UPF kept 47.85 and 31.75, whiteness raised, weft-warp-direction fracture strength and weft-direction breaking elongation rate improved, wrinkle recovery angle, bending-resistance length and static drape coefficient almost haven't changed, permeability descended a little. In the thesis, orthogonal experiments were also adopted to study the anti-UV functional finishing of silk with nano-TiO₂, and anti-yellowing ability of silk fabrics was discussed at the same time. The results showed that the UPF and anti-yellowing ability of finished silk fabrics were observably and comparatively influenced by nano-powder concentration respectively. The UPF and anti-yellowing ability rose as nano-powder concentration increased. Take single factor experiments into consideration, come to the optimal finishing conditions: nano-powder concentration, dipping temperature and dipping time are 24 g/L, 30℃and 50 min. Finished at the optimal finishing conditions, UPF of silk fabrics reached 35.87, and the whiteness reached 87.86 after 14 hours ultraviolet irradiation, which was descend 1.95%, higher by 4.7% than original silk fabrics. Also, fracture strength was improved. But, wrinkle recovery angle,bending-resistance length and static drape coefficient almost had not changed, breaking elongation rate descended, without washability.