Application of silicone oil in cosmetics


3.2 application of organic surfactants in cosmetics


Organosilicon surfactant is a kind of surfactant with large amount in daily chemical industry, which can be used as emulsifier in various cosmetics. It has the functions of emulsification, foaming, dispersing and solubilization in flavor and shampoo. It can make shampoo foam rich, fine and stable, and has antistatic effect. Organosilicon surfactant has no side effects on human body. It can form a protective film of fat layer on the skin surface and prevent the skin from drying. It is an excellent skin lubricant and humectant, especially as an emulsifier and emulsifier stabilizer, it is suitable for the preparation of facial and eye cosmetics.


3.2.1 types of organosilicon surfactants


Surfactants can be divided into four types according to their hydrophilic groups: cationic, anionic, non-ionic and zwitterionic. Organosilicon surfactants can also be classified in this way. The hydrophobic groups of organosilicon surfactants are composed of alkyl siloxanes with stronger hydrophobicity than carbon chains, which have stronger surface activity than carbon chains. In the same concentration of solution, they have lower surface activity Surface tension.


3.2.2 there are three types of the most common siloxane surfactants:


1) the general structural formula of trisiloxane surfactant can be expressed as M-D '(R) - M,


2) rake type copolymers are also called comb or graft copolymers. Its general structure is m-dx-dy (R) - M.


3) ABA type copolymers, these siloxane surfactants are generally M '(R) - dx-m' (R), also known as α - ω or Bola type.


3.2.3 application of organic surfactants


3.2.3.1 nonionic silicone surfactant


The application of silicone surfactant in personal care products is mainly polyether silicone surfactant [5].


Polyether silicone oil has the characteristics of water solubility, emulsification, surface activity and physiological inertia. It can be used in personal care products to produce colorless, tasteless, non irritating skin care products without affecting the normal breath and sweating of the skin. It can also reduce the surface tension of cosmetics, facilitate the diffusion on the skin and hair, have the properties of moisturizing and retention, and give light to the hair Ze, anti-static, good bacterial inhibition, is an excellent cosmetic additive, and the role of more and more prominent, has become a fast-growing, very worthy of attention.


3.2.3.2 cationic polysiloxane surfactant


Cationic silicone surfactant, especially quaternized polysiloxane, is the best conditioner for hair care and beauty.


Because of its large molar mass, it can be compatible with anionic surfactants, has no stimulation to human skin and eyes, has certain antibacterial ability, does not produce free ammonium in alkali solution, and has stable properties. The macromolecule of the product contains hydrophobic long-chain polysiloxane chain link, which makes it have excellent smoothness and softness; at the same time, it has strong adsorption on skin and hair due to its positive charge, and has anti-static conditioning function on hair.