Studies On Polyester-Organosilicone Hybrid Coatings

siloxane-modified polyester was synthesized with isocyanatopropy litriethoxy silane and saturated polyester resin AK3010, under the reaction between the hydroxyl and the socyanate-group, and characterized by the test of FTIR, TG, DSC. The influence of reaction condictions on the reaction was discussed, by varing the reaction temperature and reaction time.A novel crosslinking hybrid coating were synthesized with siloxane-modified polyester resin and TEOS, by sol-gel process. The study on the effect of the amount of isocyanatopropy litriethoxy silane and TEOS on the performances of the hybrid coating were researched. The result shows that the formation of carbamates can enhance the coating's alkali resistance, and the silicon-oxygen bond (Si-O-Si) improving the hardness, artificial weathering resistance, abrasion resistance, and solvent resistance of hybrid coatings. The hybrid coating shows the superb properties under the molar ratio of [OH]/[NCO]=1:1and [Si]/[Si]=1:1.Two different nano-hybrid coatings were prepared with nanosized filler particles and the hybrid coating. The nanofillers surfaces were chemically modified to improve the level of its embedment within the hybrid coating, This modification of the silica and zinc oxide nanoparticles, to which methacryloxypropyl (MEMO) was put, was successfully accomplished. Contrast with primary coatings, not only the nano-hybrid coatings improve the physical properties, such as hardness and abrasion resistance, but it also enhance the artificial weathering resistance and chemical resistant properties. And the quantity effect of SiO2-g-MEMO on the performances of the hybrid coating become more apparent than ZnO-g-MEMO's.