Organosilicone composite powder for cosmetics and preparing method of organosilicone composite powder

Abstract

The invention provides organosilicone composite powder for cosmetics. The organosilicone composite powder is characterized by being prepared from, hydrogen-containing silicone oil, an unsaturated compound, a catalyst, inorganic nanometer powder, organosilicone spherical resin powder and an organosilicone dispersing agent. The average particle size range of the composite powder is 3-100 microns, and the composite powder is of a multi-layer covering structure; the organosilicone spherical resin powder covers organosilicone spherical rubber powder, and the inorganic nanometer powder is uniformlydispersed in the organosilicone spherical rubber powder. The situation that nanometer powder is aggregated and influences the skin feeling and the ultraviolet-proof effect in the process of processingor using cosmetics can be avoided, and the situation that the nanometer powder is in contact with the skin to transfer free radicals to the skin can also be avoided; through an overall covering technology, the function of a nanometer physical sunscreen agent is improved; meanwhile, the adverse influence of the organosilicone composite powder on the skin is removed, and the organosilicone composite powder is mild and does not irritate the skin.

Description

technical field [0001] The invention belongs to the technical field of organosilicon materials, and in particular relates to an organosilicon composite powder for cosmetics and a preparation method thereof. Background technique [0002] Organosilicon elastic microsphere powder is widely used in cosmetics because of good oil absorption, dry and soft and smooth, and can be used as a skin feeling promoting additive; the method for preparing organosilicon elastic microspheres has been reported in patents (such as US 4761454, US4742142, US 4962165 , US 6497894B1, US 8133586B2, CN103122070). [0003] The methods disclosed in US 4761454, US 4742142, US 4962165, US 6497894B1 and other patents for preparing silicone elastic microspheres all use a large number of small molecule surfactants (such as polyoxyethylene alkyl ethers, etc.) as emulsifiers to emulsify vinyl-containing silicone oils. and hydrogen-containing silicone oil to form an emulsion, and then cross-linked to obtain sil...

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Problems solved by technology

These silicone microspheres are easy to agglomerate and difficult to disperse in applications. Moreover, the surface of these silicone elastic microspheres has adsorbed a large amount of small molecule surfactants, which are irritating and limit their application in cosmetics.

[0004] Patents such as US 8133586B2 and CN103122070 have reported organosilicon microspheres coated with polyorgano-sesquioxanes and their preparation methods. These organosilicon microspheres coated with polyorgano-sesquioxanes have excellent resistance to Coagulation and dispersibility; the preparation method is to prepare silicone elastic microspheres by the method of the above-mentioned patent (such as US 4761454), and then hydrolyze polyorganosilsesquioxide by silane coupling agent in the presence of alkali and surfactant Alkanes are deposited on the silicone microspheres; this method is cumbersome and costly, and it will also bring in small molecule surfactants, which will inevitably leave a pungent smell after drying

Patents US5948469 and US7648766B2 disclose methods for preparing organic silicon elastic microspheres coated with inorganic particles such as silicon dioxide and titanium dioxide on the surface. These methods also require the preparation of stable organic silicon elastic microsphere aqueous dispersions in advance, and then Inorganic particles such as silicon and titanium dioxide are adsorbed on the surface, the preparation method is relatively cumbersome, and it is difficult to avoid the use of surfactants or other emulsion stabilizers, and the smell is not mild enough

Other patents report elastic microspheres coated with inorganic nanoparticles prepared by Pickering emulsion (inorganic nanoparticles not only act as small molecule surfactants or other emulsion stabilizers but also can be coated on the surface of silicone elastic microspheres) Powder, there are disadvantages such as poor dispersion and fluidity of the powder, and inorganic nanoparticles remaining on the surface of the powder have adverse effects on human skin.

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