What is Polydimethylsiloxane and its application?

What is Polydimethylsiloxane and its application?

Polydimethylsiloxane is a hydrophobic silicone material. It has applications in various fields such as medicine, daily chemical products, food, construction, etc. Its derivatives have reached hundreds of kinds. The commonly used polysiloxanes mainly include: polydimethylsiloxane, cyclomethicone , Aminosiloxane, polymethylphenylsiloxane, polyether polysiloxane copolymer, etc. Among them, cyclomethicone is one of the commonly used polysiloxanes.

The chemical state of polydimethylsiloxane Dimethicone, depending on the relative molecular weight, varies in appearance from a colorless and transparent volatile liquid to a very high-viscosity liquid or silica gel. It is odorless, highly transparent, heat-resistant and cold-resistant. Resistance, viscosity, small change with temperature, water resistance, small surface tension, thermal conductivity, thermal conductivity of 0.134-0.159W/(m·K), light transmittance is 100%, dimethyl silicone oil is non-toxic and tasteless , It has physiological inertness and good chemical stability. Good electrical insulation, weather resistance, hydrophobicity, and high shear resistance. It 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. It is widely used as insulation lubrication, shockproof, oil dustproof, dielectric fluid and heat carrier. And used as defoaming, release agent, paint and daily chemical additives.

Polydimethylsiloxane can be mixed with lanolin, stearyl alcohol, cetyl alcohol, glyceryl monostearate, Tween, Span and other surfactants to be used as an 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 performance is faster than dolphin, lanolin and petrolatum.