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Polydimethylsiloxane, (Polydimethylsiloxane), is a hydrophobic silicone material. It has applications in various fields such as medicine, daily chemicals, food, construction, etc. It has hundreds of derivatives. The commonly used polysiloxanes are: polydimethylsiloxane, cyclomethylsiloxane , aminosiloxane, polymethylphenylsiloxane, polyether polysiloxane copolymer, etc. Among them, cyclopolydimethylsiloxane is a commonly used polysiloxane.

The chemical state of polydimethylsiloxane Dimethicone oil, depending on the relative molecular weight, has a colorless and transparent volatile liquid to a very high viscosity liquid or silica gel. It is odorless, has high transparency, and has heat resistance and cold resistance. Small change in properties and viscosity with temperature, water resistance, small surface tension, thermal conductivity, thermal conductivity of 0.134-0.159W/(m·K), light transmittance of 100%, dimethyl silicone oil is non-toxic and tasteless , with physiological inertness and good chemical stability. It has good electrical insulation, weather resistance, hydrophobicity, and high shear resistance, and can be used for a long time at -50℃~200℃. With excellent physical properties, it can be directly used for moisture-proof insulation, damping, shock absorption, defoaming, lubrication, polishing, etc. And as defoamer, mold release agent, paint and daily chemical additives.
Polydimethylsiloxane can be mixed with lanolin, stearyl alcohol, cetyl alcohol, glycerol monostearate, Tween, Span and other surfactants to be used as emulsion base. Adding film-forming agents such as PVP, PVA and cellulose derivatives to this product can enhance its protective properties. The drug release and skin penetration properties are faster than porpoise, lanolin and petrolatum.

Application areas:
The combination of low application, surface tension, easy spreading, and suitable viscosity imparts a lubricating, greasy feel to personal care products and leaves the skin soft. It has the functions of anti-foaming, defoaming and anti-foaming, and prevents the phenomenon of "whitening" when applying the product. Different products need to choose different viscosity. The higher the viscosity, the more oily it is, and the lower viscosity gives the skin a dry feeling. Due to its depositability, it is used in low levels in cosmetic formulations. The properties of the product can be adjusted by compounding with different viscosity grades of polydimethylsiloxane.
Electrical products:
Polydimethylsiloxane, which can be used for electronic connectors in the electrical and electronic industry, etc.
Leather Goods:
Polydimethylsiloxane, can be used for fiber, leather: water repellent, softener, hand improver, defoamer in dyeing industry, lubrication of sewing thread. The emulsion can be applied to the fatliquoring of leather to enhance its hydrophobicity, softness and comfort. Treating leather surfaces with it enhances abrasion resistance, water resistance and mold release.
Polydimethylsiloxane is suitable for use as a brightener ingredient for automobiles, furniture, footwear, cement products, etc., including automotive brighteners, foam furniture cleaners, vinyl roof cleaners, and building material brightening formulations. The least amount of dosage can achieve the best results.
Release agent:
Polydimethylsiloxane can be used as a release agent for rubber or plastic products (brake plates, screw heads, plugs, etc.), EVA shoe materials, directly or diluted 10-200 times with low-hardness water. Stable and extremely versatile.
Polydimethylsiloxane can be used as a lubricant for extruding rubber products such as conveyor belts. It can be used as a lubricant in the following textile processes: yarn weaving, lubrication of sutures, production of socks and underwear, lubrication of sewing needles, fiberglass filters.
Other areas:
Polydimethylsiloxane is a food-grade defoamer, which can be used in medicine, food brewing, and defoaming during fermentation. Because it is non-toxic and does not cause physiological reactions in the human body, it is also used as a medical defoamer for the treatment of acute pulmonary edema and flatulence. The substance called silicone (Silicones, or silicone oil) in pharmacy monographs is a general term for a class of organosilicon oxide polymers. Dimethicone is only one of its commonly used pharmaceuticals. In addition, there are ethyl silicone oil, methyl phenyl silicone oil, wax-containing silicone oil and so on. In the tablet polishing agent insect wax, a small amount of this product is often added to enhance the brightness and moisture resistance of one-sided. In the ointment, this product is an ideal hydrophobic base because of its good lubricity, easy to apply, does not stain clothes, and does not hinder the normal function of the skin. It is often used in combination with an oily base to make a protective ointment to prevent the irritation or corrosion of water-soluble substances, acids, and lye.

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