also known as dimethicone, is a hydrophobic silicone material. It
is used in various fields such as medicines, daily chemicals, food, and
construction. It has hundreds of derivatives. Commonly used polysiloxanes are: polydimethylsiloxane, cyclomethicone,
aminosilicone, polymethylphenylsiloxane, polyether polysiloxane copolymer.
Among them, cyclomethicone is a commonly used polysiloxane.
Physical and chemical properties of polydimethylsiloxane The chemical state of polydimethylsiloxane is dimethicone. It is a colorless or light yellow liquid with no odor and
high transparency. It has heat resistance and cold resistance. Its viscosity
changes little with temperature. It is water resistant and has a small surface
tension. It has thermal conductivity, thermal conductivity of 0.134-0.159W/M*K,
and light transmission is 100% transmittance. Dimethicone is non-toxic and
tasteless, physiologically inert and has good chemical stability. It has good
electrical insulation and weather resistance, good hydrophobicity, and high
shear resistance. It can be used for a long time at -50 °C ~ 200 °C. It has
excellent physical properties and can be directly used for moisture insulation,
damping, shock absorption, defoaming, lubrication, polishing and so on. It is
widely used as insulation lubrication, shockproof, dustproof, dielectric fluid
and heat carrier. It is also used as an antifoaming, release agent, paint and
daily chemical additive.
Polydimethylsiloxane can be used as an emulsion type matrix in combination with
surfactants such as lanolin, stearyl alcohol, cetyl alcohol, glyceryl
monostearate, Tween, and Span. A film forming agent such as PVP, PVA, and a
cellulose derivative can be added to the product to enhance the protective
property. The release and penetration of the drug is faster than that of
porridge, lanolin and petrolatum. Polydimethylsiloxane applied in cosmetics Polydimethylsiloxane can be used directly. In order to disperse the methyl silicone oil,
impregnate, spray and improve the efficiency, it can also be used in three
types: solution type, lipid type and emulsion type. It and its derivatives are
high-quality raw materials for cosmetics, with good skin care functions, and
are synthetic fats in cosmetic raw materials. This product is non-toxic,
non-irritating to the skin and mucous membranes, but irritating to the eyes,
generally recognized as safe.
The moisturizing silicone of polydimethylsiloxane is a general term for such materials, also known as silicone or silicone oil,
and is a substance of this type. In cosmetics, it has lubricating properties,
anti-ultraviolet effect, good gas permeability, and has obvious dust-proof
function. It is also used in cosmetics to replace traditional oil and fat
materials, which is based on polydimethylsiloxane.
Sexual characteristics, skin care products are usually used in moisturizing
products, and some high-end skin care products will also be applied. Polydimethylsiloxane permeability Polydimethylsiloxane is very permeable to the skin. The smooth and refreshing feeling of
skin care products applied to the skin is usually due to the addition of the
raw materials. The raw material itself has a good effect on increasing the
softness of the skin. In hair care shampoo products, you can deepen the color
of your hair and help your hair stay natural. Basically, the raw material can
be found in shampoos that are smooth in hair.
In cosmetics, polydimethylsiloxane is required to have low viscosity, good volatility,
and easy cleaning. It can be used up to 15% or more. The panel of cosmetic
ingredients review concluded that dimethyl siloxane and related derivatives
were used in formula-safe cosmetics.
It is not irritating to the skin and mucous membranes, but it is
irritating to the eyes. Generally recognized as safe, the relevant departments
of the FDA-led countries have approved the use of polydimethylsiloxane in cosmetics. Polydimethylsiloxane in other areas Polydimethylsiloxane is a food-grade defoamer that can be used in the brewing of
medicines and foods, and in the defoaming of fermentation time. 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 known as siloxane (Silicones, or silicone oil) is a
generic term for a class of silicone oxidized polymers. Dimethicone is only one
of the drugs commonly used in pharmaceuticals. In addition, there are ethyl
silicone oil, methyl phenyl silicone oil, waxy silicone oil and the like. In the
tablet polishing insect wax, a small amount of this product is often added to
enhance the brightness and moisture resistance of the one-sided surface. In the
ointment, this product is an ideal hydrophobic matrix because of its good
lubricity, easy application, no staining, and no hindrance to the normal
function of the skin. It is often used in combination with an oil-based matrix
to form a protective ointment for preventing the stimulation or corrosion of
water-soluble substances and acids, alkalis, and the like.