Nano-inorganic/organic Silicon Hybrid UV Curable Coatings

Traditional hybrid method is that inorganic nanoparticles are coated by silane coupling agent,because silane coupling agent possess characteristics both of Organic and inorganic, The modified inorganic nanoparticles which are coated by silane coupling agent easily are spreaded in organic phase and the organic structure of silane coupling agent and organic phase entwine.Usually silane coupling agents don't react with the organic resins.The inorganic modified nanoparticles and organic resins are not combined by chemical combination that led to the modified inorganic nanoparticles may be removed from the organic phase.In response to this problem,a new type of UV-curable hybrid materials was designed.First,UV-curable hybrid materials be prepared by hybrid method,then using UV curing technology,UV-curable resin and UV-curable hybrid materials curing cross-linked,so that organic and inorganic chemical combine with organic phase,"second hybrid" is achieved between UV resin organic and UV-curable hybrid materials,and because the hybrid materials can enhance the wear-resistant of coatings,temperature-resistant and hardness properties.Based on silicon tetrachloride,methyl ethyl acrylate hydroxy-β,phenyl chloride, dichloro-phenyl silane as the main raw material,a new hybrid material that polypropylene para-siloxane / nano SiO₂ hybrid materials is synthesized.Hybrid materials compound with epoxyacrylic resins and aliphatic urethane acrylate resin produced hybrid UV-curable coatings.The thermal stability and mechanical properties hybrid UV curable coating were tested.Main contents include:(1)The polypropylene para-silane synthetic routes were explored.The polypropylene para-silane was synthesized by hydrolysis between chlorosilanes.The functional group of product was characterized by Fourier Transform Infrared Ray(FT-IR).The results show that the IR vibration characteristics spectrum of Si-O-Si chemical bond and Si-O-Si(linear polysiloxane)chemical bond are evidence,this characteristics show that silicone chain is generated,indirectly show that carbon-carbon double bond may be combine with silicone chain,the polysiloxane will possess light-cured activity.The ratio of synthetic materials and the reaction conditions are optimized,The hydrolysis temperature is controlled in 60～70℃, the mixture of ether and xylene are as solvent,nAPS:nPhCH₃SiCl₂:nTAS = 1:7.5:5,GZJ amount is 1.5wt%,H₂O:PhCH₃SiCl₂/(mol)=3.2:1,product did not gel or cross-linked after a week,viscosity of product is 198mpa·s.(2)The hybrid mechanism of polypropylene para-silane and nano-silica was discussed; The experiment which polypropylene para-silane and the nano-silica hybride on different ratios were done,the best ratio of polypropylene para-silane and the nano-silica hybride(wt)is PAS:SiO2.Hybrid materials were characterized by IR,SEM,TG.(3)The relation of hybride matrials to compound coatings on adhesion,hardness,wear resistance,impact resistance and temperature resistance were studied;The experimental making sure best amount of hybrid materials in the composite coating system is 17%, wear-resistant is raised 45.5%,the hardness reach 4 H,adhesion reach 1 level,the impact resistance is 50 kg·cm;According as the chemical bond and the micro-structure of hybrid materials,the reasons that hybrid materials can raising the adhesion of coatings,hardness, wear-resistance,temperature-resistance and impact-resistance were speculated.