Microparticulate composite material based on zinc oxide grafted to diatomaceous earth, method for preparing same and uses thereof as an anti-uv active agent
AssigneeVinpai
InventorsHervé DEMAIS, Philippe LE RAY
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Abstract
The invention relates to a method for preparing a composite material comprising zinc oxide crystals grafted to the surface of diatomaceous earth particles, comprising a step of milling in the presence of an agent for stabilizing the electron charges created during the milling, and also to a composite material comprising zinc oxide crystals grafted to the surface of diatomaceous earth particles, and to the use thereof as an active agent for protection against UV radiation.
Claims10
A process for preparing a composite material comprising zinc oxide crystals grafted onto the surface of diatomaceous earth particles, comprising the following steps:
- 1) preparing diatomaceous earth microparticles by milling diatomaceous earth in aqueous medium;
- 2) grafting zinc salt crystals onto the surface of the diatomaceous earth microparticles;
- 3) converting said zinc salt crystals grafted onto the surface of the diatomaceous earth microparticles into zinc oxide crystals grafted onto the surface of the diatomaceous earth microparticles;
- 4) milling the microparticles obtained in step 3) in aqueous medium to an individual particle size ranging from 10 to 300 nm, this milling being performed in the presence of an agent for stabilizing the electronic charges created during milling.
A composite material comprising zinc oxide crystals grafted onto the surface of diatomaceous earth particles, said grafted diatomaceous earth particles having an individual particle size ranging from 10 to 300 nm.
Dependencies are inferred from the claim text.