The most used are silicone oil (polydisiloxane) methylphenyl silicone oil (polymethylphenylsiloxane), polydimethylcyclosiloxane, silicone glycol copolymer, amine base Modified silicone oil, silicone protein interpolymer and methyl chlorosilicone oil, emulsified silicone oil and other modified water soluble or alcohol soluble silicone oils. Classified from the application, it can be used for hair care, skin care, and sun protection.

3.1.3 Application of silicone oil in cosmetics
Organopolysiloxanes have been widely used in skin care, hair care, beauty products, and special products such as antiperspirants and deodorants. Through a large number of long-term physiology, toxicology and genetic experiments, it is confirmed that some organopolysiloxane compounds are safe and reliable, and have excellent properties, such as light transmission and UV resistance, strong physiological inertia, non-toxic, no odor, and good. Surface activity, these characteristics make organopolysiloxanes more and more widely used in cosmetics. Polysiloxanes have many outstanding advantages for personal skin care products. Some people have obtained a viscosity of 315 × 10 -4 (m 2 / s) of methyl polysiloxane by comparison with various ingredients (Vaseline, white oil, etc.) commonly used in personal care products, in terms of spreadability and emollients. Sexuality and softness are the best in all three aspects. Moreover, silicone skin care will not block the pores on the surface of the skin and reduce the production of acne. The introduction of other functional groups in the silicone molecule provides a variety of modified polysiloxanes with superior properties. Polyether modified polysiloxane has good surface activity in organic system or in water. It can reduce the surface tension of liquid, play various functions such as wetting and softness, and can also resist static electricity and enhance gas permeability. When other cosmetic components are mixed, the component can be reduced in irritation to the skin and eyes, and is widely used in cosmetic cosmetics. Adding 0.5% to 1% of polyether modified polysiloxane to the degreaser detergent can increase the oil stain elution rate by nearly 30%. Amino-modified polysiloxane having a certain ammonia value, together with a suitable anionic surfactant, can be made into a transparent shampoo. Adding a small amount of amino silicone oil to the toothpaste can form a hydrophobic and stable film on the tooth surface, which can effectively prevent dental staining caused by smoking and dental caries caused by organic acid, and improve oral hygiene.

3.2 Application of organic surfactants in cosmetics
Silicone surfactants are a relatively large amount of surfactants used in the chemical industry, and can be used as emulsifiers in various cosmetics. It is used in fragrance and shampoo. It has the functions of emulsifying, foaming, dispersing and solubilizing. It can make shampoo foam rich, fine and stable, and has antistatic effect. Silicone surfactant has no side effects on the human body, can form a protective film of fat layer on the skin surface, prevents dry skin, is an excellent skin lubricant and moisturizer, especially as an emulsifier and emulsion stabilizer for the preparation of face and eye. Cosmetics.

3.2.1 Types of silicone surfactants
Surfactants can be classified into four types according to the type of hydrophilic group: cationic, anionic, nonionic and zwitterionic. The silicone surfactant can also be classified as such. The hydrophobic group of the silicone surfactant is composed of It is composed of an alkylsiloxane which is more hydrophobic than a carbon chain, has a stronger surface activity than a carbon chain, and has a lower surface tension in a solution of the same concentration.

3.2.2 There are three main types of silicone surfactants:
1) The trisiloxane surfactant has a structural formula of M-D'(R)-M,
2) Rake-type copolymers are also called comb or graft copolymers. Its structural formula is M-Dx-Dy(R)-M.
3) ABA type copolymers, these siloxane surfactants generally have the structure M' (R)-Dx-M' (R), also known as α-ω or Bola type.