Study On Preparation And Properties Of Uv-protective Transparent Coating Material On Polycarbonate

Lightweight and security is the focus of attention of many domesticautomobile manufacturers, car windows is one of the hot, polycarbonatebecause of its light weight, impact strength, is an alternative to thetraditional silicate glass is bestalternatives, but the poor abrasion resistanceand UV resistance is he biggest bottleneck that applied to car glazing.Domestic polycarbonate glazing rarely been reported.UV-resistant coating of methyl methacrylate resin, with excellentoptical properties, adhesion and resistance to ultraviolet radiation,120h UVaccelerated aging, the yellowness index is about1(uncoated coated PC isabout10.5), but surface hardness is low;Aliphatic urethane acrylate resin coating has excellent opticalproperties, and have high surface hardness, is about2H, performance ofUV-resistant shows,120h UV accelerated aging, the yellowness index reach4, but240h UV accelerated aging, the yellowness index reach15; Nano-SiO₂/silicone resin coating by sol-gel prepared, IR spectra showthat the sol in the presence of Si-O-Si absorption peak, and MEMO wassuccessfully grafted on the SiO₂surface, the TGA curve showed effect ofacidity on the graft yield, Nano-SiO₂/silicone resin materials, transmissionelectron microscopy analysis showed that the nanoparticles were dispersedin a silicone resin, and particle size is about30nm, The coating has excellentoptical properties, surface hardness of1H, and adhesion is ordinary, about4B, the coating resistance to ultraviolet radiation test results showed thatafter120h of UV aging test, the yellowness index is about4(uncoated PCplate around10.5), but after the accelerated aging240h, UV absorbers hadready lost its effect, and the yellowness index reached17, the yellownessindex of uncoated PC is about18;Nano-TiO₂/silicone resin coating by sol-gel prepared, IR spectraindicated that the sol of Si-O-Si absorption peak, the Ti-O-Ti bond andTi-O-Si bond absorption peak, showed that TBT and MTMS occur thehydrolysis condensation reaction, and ultimately formed theorganic-inorganic hybrid structure, the TG curve proved nano-TiO₂introduced into the coating by hybrid, thermal properties of organic-inorganic hybrid nano-TiO₂/silicone resin coatings is better, TEM analysisshowed that the nanoparticles dispersed in a silicone resin, and particle sizeis about20nm, the coating has excellent optical properties, lighttransmission rate is more than90%, haze is less than1%, the coating surface hardness of3H, good adhesion, UV-resistant performance test resultsshow that after240h UV accelerated aging, the yellowness index is about5(uncoated PC plate17around and PC of the coated silicone resin andultraviolet absorber is about16). This shows that relative to the organic UVabsorbers, inorganic nano-titanium dioxide solve the problems that organicUV absorbers would lost effect under UV irradiation of long time, ultimately,getting excellent comprehensive performance polycarbonate plate.