Nano zinc oxide surface modifying method
A technology of nano-zinc oxide and nano-zinc oxide powder, which is applied in the direction of cosmetics, pharmaceutical formulations, cosmetic preparations, etc., can solve the problems of many operation steps, time-consuming, and increased production costs, and achieve simple process and photocatalytic activity suppression , the effect of easy industrialization
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Embodiment 1
[0023] 1) After mixing 150ml of deionized water and 50ml of ethanol in a beaker, take 6.5g of nano-zinc oxide powder and add it, ultrasonic treatment for 30min to fully disperse the nano-zinc oxide, then transfer to a 500ml three-neck bottle.
[0024] 2) Take 0.003mol tetraethyl orthosilicate, 0.027mol dimethyldiethoxysilane and 25ml ethanol and mix thoroughly, add into a three-necked bottle under vigorous stirring; adjust the pH of the solution to 9 with ammonia water (27%), and raise the temperature at the same time to 50°C and react for 10 hours.
[0025] After the reaction is completed, filter, and the obtained filter cake is dried at 100°C for 24 hours, ground and pulverized to obtain surface-modified nano-zinc oxide powder.
[0026] Comparative Example of Embodiment 1
[0027] 1) After mixing 150ml of deionized water and 50ml of ethanol in a beaker, take 6.5g of nano-zinc oxide powder and add it, ultrasonic treatment for 30min to fully disperse the nano-zinc oxide, then...
Embodiment 2
[0031] 1) After mixing 150ml of deionized water, 25ml of ethanol and 25ml of propanol in a beaker, take 6.5g of nano-zinc oxide powder and add it, ultrasonic treatment for 30min to fully disperse the nano-zinc oxide, then transfer it into a 500ml three-neck bottle.
[0032] 2) Take 0.015mol ethyl orthosilicate, 0.015mol monomethyltriethoxysilane and 25ml ethanol and mix thoroughly, add into a three-necked bottle under vigorous stirring; adjust the pH of the solution to 9 with ammonia water (27%), and raise the temperature at the same time to 70°C and react for 12 hours.
[0033] After the reaction, the product system was filtered, and the obtained filter cake was dried at 120°C for 12 hours, ground and pulverized to obtain surface-modified nano-zinc oxide powder.
Embodiment 3
[0035] 1) After mixing 100ml of deionized water, 25ml of methanol and 25ml of ethanol in a beaker, take 6.5g of nano-zinc oxide powder with a particle size of 10-100nm and add it, and use an emulsifier to high-speed shear (4000rmp, 10min) to make the nano Zinc oxide is fully dispersed and transferred to a 500ml three-neck bottle.
[0036] 2) Take 0.042mol of methyl orthosilicate, 0.018mol of diphenyldiethoxysilane and 25ml of methanol and mix them thoroughly, and add them into a three-necked flask under vigorous stirring; adjust the pH of the solution to 10 with sodium hydroxide solution, and simultaneously heat up to 80°C, react for 10 hours.
[0037] After the reaction is finished, the product system is directly spray-dried to obtain surface-modified nano-zinc oxide powder.
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