Study On Preparation And Performance Of Uv-Curable Organic Inorganic Hybrid Materials

EA/HPA/TEOS and EA/TMSPM hybrid materials were prepared based on the epoxy acrylate（EA） and the precursors of tetraethoxysilane （TEOS） or trimethoxysilyl-propyl methacrylate （TMSPM） in this paper. The UV curable organic inorganic hybrid materials were modified by changing feeding mode, adjusting the process of Sol-Gel and adding the process of vacuum process for paint film. We hope to gain the expected organic inorganic hybrid materials.The effect of different feeding mode on the properties of EA/HPA/TEOS hybrid material was studied. The results showed that EA/HPA/TEOS hybrid material prepared by 1# feeding mode exhibit better performance.The effect of different pH of HCl solution and deionized water dosages of Sol-Gel process on hybrid materials’ curing time, gel content, pencil hardness and stability at normal temperature were studied, and obtained the optimized technological parameters, pH=2, deionized water dosage was 0.13g for EA/HPA/TEOS hybrid material; pH=3, deionized water dosage was 0.22g for EA/TMSPM hybrid material. EA/HPA/TEOS and EA/TMSPM hybrid materials with different precursors content were synthesized at the the optimized technological parameters, and the materials’ performance were investigated.The curing rate of the uncured hybrid films, gel content and pencil hardness of cured hybrid films increased after vacuum process, however, there was no influence on the curing rate of EA/HDDA films, gel content and pencil hardness of the cured films.Fourier transformed infrared spectrum （FTIR） results showed that the Si—O—Si group was formed in hybrid materials. Besides, Si—O—Si characteristic absorption peaks of hybrid materials stayed at higher frequency with higher relative absorption strengths after vacuum process.TG analysis showed that decomposition temperature of EA/HPA/TEOS and EA/TMSPM hybrid materials were 442℃and 451℃respectively, which were distinctively higher than those of EA/HDDA material while the content of SiO₂ reached to around 9wt%. It was indicated that thermal stability of hybrid materials was improved as a result of the incorporation of inorganic phase. The decomposition temperature of EA/TMSPM was higher than that of EA/HPA/TEOS. FT-IR results showed that the increase of the decomposition temperature of EA/TMSPM was due to the much densier Si—O—Si network.The decomposition temperature of hybrid materials was further increased after vacuum process, conbined with other characterization proved that Si—O—Si network became better than before.