The Surface Modification Of Nano-Titanium Oxide And Its Application In Coating

Nano-partical has applied preliminary in the field of the functional coatings,. But for the strong activity of Nano-TiO2, the conglobation will happen easily, and it will greatly reduce the application effect in coating. And for the hydrophilicity , it's hard to break up uniform in resins, so air gaps appear in the interface, then the high polymer in the interface willhappen degradation reaction or embrittlement reaction, and coatingsperformance will fall down. So, in order to increase the dispersity of theNano-partical in coatings, it's necessary to modify the surface of Nano-partical. At present, some research documents and application have been given about the modification of nano-partical. With the developing of Microwave technology, wonderful effect happened when the Microwave technology was used in chemical reaction. A new process on surface modification of Nano-partical was studied in this paper, microwave was used as the heater equipment in this process. The results showed: the microwave supplied enough energy for the chemical reaction, and controlled the growth of Nano-partical. The experiments proved that it's effective of using oleic acid to modify the surface of Nano-TiO2 particle. The best modification process is: 25ml oleic acid for per gramme Nano-TiO2 particle, modification agent is v油酸/v正丁=1/2, modification time is 3min with full power, then 30min with small power. After beenmodified, the Nano-TiO2 particle shows better lipophilicity. It was proved that the combine between carboxylic acid group and TiO2 particle is chelation by analyzing infra-red spectrum. The total clad ratio reached 29.14% by measuring TG-DTA curve. The final result is TiO2 particle being surrounded by organic carbon chains. The performances of cohesion, corrosion resistance, flexibility and shock strength increase when nano-TiO2 be added.