Anti-ultraviolet Finish Of Fabric By TiO₂ And Zn-doped Sol

There is a variety of environmental problems caused by rapid economic development in recent years. These environmental problems eventually result in damaging the ozone layer, which increases the amout of ultraviolet reaching the earth and creates more influence on human health. So peopele become more aware of the ultraviolet radiation on the human body. Finishing agents can be divided into organic ultraviolet ray absorber and inorganic ultraviolet reflecting agent based on the mechanism of UV finishing agents. The application of organic ultraviolet ray absorber is limited due to its toxicity and irritation. Nano-TiO2 as a inorganic ultraviolet reflecting agent has attractive characteristics such as strong ability to absorb ultraviolet light, long-term stability and nontoxicity.Sol–gel process is one of the methods prepared for TiO2. The precursor of sol-gel process is inorganic or organic metal compounds. The precursor form sol through hydrolysis or alcoholysis reaction. The function of the fabric was special afer the fabric was finished by sol.Firstly, peroxo-modified nano-TiO2 sol was synthesized by titanium tetrachloride(TiCl4) as precursor, ammonia(NH3.H2O) as pH adjusting agent, peroxide(H2O2) as complex agent. The orthogonal result of peroxo-modified nano-TiO2 sol showed the optimum parameters of technology are: concentration of titanium tetrachloride 0.1mol/L, temperature of oil bath 100℃, time of oil bath 6h. The test of UV transmittance, breaking strength and elongation at break showed the optimum of baking temperature and baking time of cotton and polyester are: 140℃ and 3min, 150℃ and 3min. The standard test of washing fabric showed that the nano TiO2 coated on the fabric had excellent fastness to washing and good uv performance. The optimum amount of coupling agent KH-550 was studied to further improve durability of the cotton treated by sol. The result of XRD showed the structure of TiO2 at the room temperature was random. The SEM was used to characterize the TiO2 on the fabric. It was observed that the surface of fabric was coated with relatively uniform film. The result of EDXA and FTIR showed the main components of the sol was TiO2 and the film on the fabric contained TiO2.Secondly, zinc was doped in the TiO2 sol in order to improve UV performance of TiO2. The optimum amount of zinc-doped was 3% of titanium dioxide molar amount. The standard test of washing cotton fabric treated separately by TiO2 sol and Zn-doped TiO2 sol showed the durability of the cotton fabric treated by Zn-doped TiO2 sol was better than the cotton fabric treated by TiO2 sol. The result of XRD showed the structure of TiO2 was not changed when zinc was doped in the TiO2 sol. The test of EDXA showed Zinc had been successfully doped in the TiO2 sol. And the result of FTIR showed the absorption intensity of the peak among 600~800cm-1 became smaller when zinc was doped in the TiO2 sol.