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摘要
Aluminum pigments were encapsulated with a thin but dense film of nano-SiO2particles in sol-gel method, using tetraethoxysilane as the precursor and ammonia as the catalyst. The influences of reaction factors on the film's pattern and the acid proof behavior were studied. The relative rates of tetraethoxysilane hydrolyzation, silicic acid absorption and condensation polymerization on aluminum pigments could be controlled by adjusting the reaction parameters, such as the reaction temperature, time and the ratio of reactants. And the homogeneous and dense SiO2layer could be deposited thoroughly around the surface of the aluminum pigments. It was found that, when dropping tetraethoxysilanc and ammonia simultaneously into the pigments solution and controlling the mole ratio of aluminum to tetrathoxysilane at 5.5, the ratio of water to tetraethoxysilane at 30, the dosage of catalyst with 3 mL, the reaction temperature at 40°C and time of 6 h respectively, the encapsulated aluminum pigments obtained could be immersed in the acid media of pH=1 for 30 d without H2giving-off.
- 出版日期2009-12
- 单位华南理工大学
