Method for producing microcapsules with a sun protection effect

摘要

A method for producing microcapsules with a sun protection effect includes mixing tetraethoxysilane (TEOS), ethanol, and water and uniformly vibrating the mixture of TEOS, ethanol, and water. The TEOS, ethanol, and water have an appropriate ratio therebetween. Nitric acid is used to adjust the mixture of TEOS, ethanol, and water to have an appropriate pH value. The mixture is placed still to hydrolyze the mixture. The hydrolyzed mixture is heated and stirred to obtain a TEOS sol. Then, the TEOS sol, Span 80, and mineral oil are mixed in an approximate ratio to obtain a microemulsified TEOS gel. The microemulsified TEOS gel is centrifuged. The upper oil phase is removed. The lower water phase and powders are sucked, filtered, and cleaned. The powders are recycled and baked.

主权项

1. A method for producing microcapsules with a sun protection effect, comprising:
hydrolysis and condensation: mixing tetraethoxysilane (TEOS), ethanol, and water and uniformly vibrating the mixture of TEOS, ethanol, and water, with the TEOS, ethanol, and water; adding nitric acid to adjust the mixture of TEOS, ethanol, and water; placing the mixture still to hydrolyze the mixture; heating and stirring the hydrolyzed mixture to obtain a TEOS sol; and microemulsion polymerization: mixing the TEOS sol with Span 80, and mineral oil to obtain a microemulsified TEOS gel; centrifuging the microemulsified TEOS gel; removing the oil phase; sucking and filtering the remaining water phase to obtain a powder; cleaning the powder with organic solvent; and baking the powder in an oven.