Dimethylsilicone oil generally refers to polydimethylsiloxane, polydimethylsiloxane, is a hydrophobic class of organosilicon materials. It is used in various fields such as pharmaceuticals, household chemicals, food, construction, etc. Its derivatives have reached hundreds, and the commonly used polysiloxanes are mainly: polydimethylsiloxane, cyclomethicone, aminosiloxane, polymethylphenylsiloxane, polyether polysiloxane copolymer, etc.
The linear dimethylsiloxane with Si-O-Si as the main chain and methyl group attached to the silicon atom has a series of properties due to the small intermolecular force, the spiral structure of the molecule, the methyl group is arranged outward and can rotate freely. Such as colorless and transparent, small temperature viscosity coefficient, large expansion coefficient, low vapor pressure, high flash point, high and low temperature resistance, low surface tension, high compression rate, inert to materials, chemically inert, non-corrosive and physiologically inert, it is these characteristics that determine its wide range of applications.
1.Role in rubber, plastic and metal demoulding
Due to the non-stick property of dimethyl silicone oil and rubber, plastic, metal, etc., it can be used for the mold release of polyurethane microporous elastomer molded products, and also for the mold release of crusty polyurethane molded products, rubber products, ABS molded products, etc. The main advantages of this release agent are small release force, no pollution, easy transportation, and clean, smooth and clear texture on the surface of the products. With the rapid development of polyurethane industry, silicone oil mold release agent market is expanding.
2. Application of silicone oil in the textile industry
Methyl silicone oil is used in large quantities as oiling agent for raw fiber and raw cotton, oiling agent for spinning, and smoothing agent for sewing thread. The oil agent for raw silk and raw cotton is low viscosity methyl silicone oil, generally 10 viscosity. The smoothing agent for sewing thread is medium to high viscosity methyl silicone oil, generally 500 viscosity silicone oil is used. The use of methyl silicone oil thermal stability and low viscosity temperature coefficient, with antistatic agents, emulsifiers and other oils made of spinning oil, used in nylon, polycool spinning process, to prevent the spinning process of very fine monofilament bundle from the spinneret spray and fast winding when the occurrence of charged caused by the breakage and loosening. In the case of melt-proofing, the nozzle is also treated with methyl silicone oil as a release agent to prevent breakage caused by the adhesion of carbide or melt. In addition to the functionalization of textiles as an additive, silicone products will also be used in other areas of textiles, such as the combination of silicone and polyurethane to form a fabric coating; silicone and acrylic polymerization to form a fabric printing; silicone and organic fluorine combination to form a waterproof coating on the surface of the fabric.
3. Application of silicone oil defoamer
Because of the small surface tension of dimethyl silicone oil, and insoluble in water, good chemical stability, non-toxic, as defoamer has been widely used in petroleum, chemical, medical, pharmaceutical, food processing, textile, printing and dyeing, paper and other industries. The secondary processing of silicone oil can also produce defoamer emulsion, applied to the water-based system.
4. Application of silicone oil in cosmetics
Polydimethylsiloxane can be used as silicone surfactant, which is colorless, tasteless, non-irritating, non-volatile thin to viscous fluid. It has the following good characteristics: ①good lubrication performance; ②good glossiness; ③good antistatic performance; ④it has a slow-release fragrance fixing effect on flavor and fragrance.
5. Application of silicone oil in electromechanical industry
Widely used in electric motors, electrical appliances, electronic instruments as temperature resistance, arc corona resistance, corrosion resistance, moisture-proof, dustproof insulation medium, is also used as a transformer, capacitors, television sets, such as the impregnating agent of the scanning transformer. In a variety of precision machinery, instruments and meters, used as liquid anti-vibration, damping materials. 201 methyl silicone oil’s shock-absorbing properties are little affected by temperature, mostly used in occasions with strong mechanical vibration and large changes in ambient temperature, used in aircraft, automotive instruments.
6. Application in coating
It can be used as an additive for many materials, such as paint brightener, add a small amount of silicone oil to paint, can make the paint does not float package, not wrinkle, improve the brightness of the paint film; add a small amount of silicone oil to the ink, can improve the printing quality; add a small amount of silicone oil to polishing oil (such as car polish), can increase the brightness, protect the paint film, and has excellent waterproof effect.
7. Application in medicine
Polysiloxane is widely used in medical field because of its non-toxic, tasteless, good biocompatibility, non-skin sensitization, physiological inertia, high and low temperature resistance, non-flammability, good air permeability, unique solution permeability and stable physical and chemical properties. Dimethylsilicone oil paste can prevent the skin from being affected by acids, alkalis, salts and various detergents. Silicone oil can be made into defoamer and skin protector for medical treatment, and can be used to prepare topical drugs for treating various burns and skin diseases, and can also be made into toothpaste containing silicone with dual effects of anti-caries and anti-allergy; in addition, polysiloxane has a wide range of applications in the pharmaceutical field.
8. Other applications
Using its high flash point, odorless, colorless, transparent and non-toxic to humans, it is used as a heat carrier in oil baths or thermostats in steel, glass, ceramics and other industries and scientific research. With its good anti-shear property, it can be used as hydraulic oil, especially aviation hydraulic oil. Treating rayon spinning head with it can eliminate static electricity and improve drawing quality. Adding silicone oil to cosmetics can improve the moisturizing and protective effect on the skin, etc
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