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Characteristics and application of silicone oil for cosmetics

2019-11-04 5

Silicone has a unique silicon-oxygen bond structure, Si-O-Si, which gives a large bond angle and bond length, and has a small intermolecular force. Unlike ordinary organic molecules, it is easy to crystallize, and therefore, the gas permeability is good. The higher bond energy makes the silicone polymer have outstanding heat resistance and excellent softness; the helical structure of the molecular chain and the longitudinal direction of the methyl group make it have a very low surface tension and good water repellency. Due to the structural specificity, the organosiloxane polymer has a series of properties such as lubrication, softness, water repellency, defoaming, antibacterial and anti-mildew, and is used in personal care products.

The characteristics of silicone-containing cosmetics are mainly as follows:
(1) Good lubricating performance, can form a uniform waterproof protective film after coating the skin, but without any sticky and greasy feeling, the gloss is good.
(2) The performance against ultraviolet radiation is good, and it does not oxidize and deteriorate under ultraviolet irradiation to cause skin irritation.
(3) The antistatic performance is good. The test shows that the static electricity of the skin covered with the silicone skin cream is completely eliminated, and the dustproof effect is obvious.
(4) Good gas permeability, even if a silicone film is formed on the skin, it does not affect the sweat discharge. It has a slow release and aroma effect on flavors and fragrances, and thus has a longer fragrance period.
(5) High stability, chemically inert, no adverse effects on other components of cosmetics, especially active ingredients, and good compatibility.
(6) Non-toxic, odorless, tasteless, does not cause irritation and allergies to the skin, has high safety, and has certain curative effects on certain skin diseases, such as sweaty eczema, neurodermatitis and occupational dermatitis.

Silicone oil is generally divided into ordinary silicone oil and modified silicone oil. So far, silicone products that have been successfully developed for cosmetics include: polydimethylsiloxane, polymethylphenylsiloxane, methylhydrogen silicone oil, polyether. Modified silicone oil, long-chain alkyl modified silicone oil, cyclic polysiloxane, amino modified silicone oil, carboxyl modified silicone oil, polymethylsiloxane emulsion, silicone wax, silicone resin, silicone treated powder And so on.