Properties and Uses of Dimethicone
Si-O-Si as the main chain, silicon atoms connected to the methyl methyl linear dimethyl silicone oil, due to the intermolecular forces are small, the molecule is a spiral structure, the methyl outward arrangement and can be free to rotate, and thus has a series of characteristics. Such as colorless and transparent, temperature viscosity coefficient is small, large expansion coefficient, low vapor pressure, high flash point, high and low temperature resistance, low surface tension, high compression, inert to the material, chemically inert, non-corrosive and physiologically inert, it is these characteristics determine the broad range of uses.
Taking Dow’s dimethyl silicone oil as an example, it can be divided into three types of specifications: low viscosity silicone oil 0.65~50mm2/s; medium viscosity silicone oil 50~1000mm2/s; high viscosity silicone oil 5000~1000000mm2/s.
Application of dimethyl silicone oil
1. Application in electromechanical industry
Widely used in motors, electrical appliances, electronic instruments as temperature resistance, arc corona resistance, corrosion resistance, moisture, dust insulation medium, is also used as transformers, capacitors, television sets, scanning transformer impregnating agent and so on. In a variety of precision machinery, instruments and meters, used as a liquid anti-vibration, damping materials.201 Methyl silicone oil shock absorbing performance is affected by the temperature is small, and is used for strong mechanical vibration and ambient temperature changes in large occasions, the use of airplanes, automobiles, instrumentation. For example, the Dow Transformer Silicone Oil distributed by Qingdao Hongruize Chemical Industry has been used in the instrumentation of large-scale power plants, and has made a certain contribution to the transmission of electricity from the West to the East.
2. For sewing thread smoothing agent
Methyl silicone oil is used in a large number of fibers, the original silk, cotton with oil, spinning with oil, sewing thread with a smoothing agent. Raw silk and cotton with oil agent for low viscosity methyl silicone oil, generally 10 viscosity, such as Hong Ruize distribution of Dow 10 viscosity silicone oil is widely used in spandex spinning production process. Smoothing agent for sewing thread is medium-high viscosity methyl silicone oil, generally using 500 viscosity silicone oil. Using the thermal stability and low viscosity and temperature coefficient of methyl silicone oil, with anti-static agents, emulsifiers and other oils made of spinning oils, used in nylon, polycool spinning process, to prevent the process of spraying very fine monofilament bundles from the nozzle when spraying and rapid winding occurs at the time of the electric charge caused by the breakage of the silk and the loosening. In the case of melting silk prevention, the nozzle should also use methyl silicone oil for mold release treatment to prevent carbide or melted material attached to cause silk breakage.
3. As defoamer
Due to the dimethyl silicone oil surface tension is small, and insoluble in water, chemical stability, non-toxic, as an antifoaming agent 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 antifoam agent emulsion, applied to aqueous systems, such as Qingdao Hong Ruize distribution of Dow antifoam agent AFE-1410/0050 industry has a large number of applications.
4. For mold release agent
It and rubber, plastic, metal and other non-stick, and can be used to do a variety of rubber, plastic products molding process mold release agent, and precision casting. It is not only convenient to use it as mold release agent, but also makes the product surface clean, smooth and clear texture.
5. For insulation, dustproof, mold coating
In the glass, ceramic surface dip-coated layer of 201 methyl silicone oil, and heat treatment at 250-300 ℃, can form a layer of semi-permanent waterproof, mold and insulating film. With the treatment of insulating devices, can improve the insulating properties of the device; with the treatment of optical instruments, can prevent moldy lenses, prisms; with the treatment of medicine bottles, can extend the preservation period of the drug, and does not make preparations for the loss of sticking to the wall; with the treatment of the surface of motion picture films, can play a lubricating effect, reduce friction, extend the life of the film.
6. For lubricant
It is used as lubricant for rubber, plastic bearings and gears. It can also be used as a lubricant for rolling friction between steel and steel under high temperature, or friction between steel and other metals.
7. As additive
It can be used as additives for many materials, such as as a brightener for paint, add a small amount of silicone oil to the paint, can make the paint does not float package, do not wrinkle, improve the brightness of the film; add a small amount of silicone oil to the ink, can improve the quality of printing; add a small amount of silicone oil to the polishing oil (such as automotive varnish oil), can increase the light, to protect the paint film, and has excellent waterproofing effect.
8. Other aspects
Using its high flash point, odorless, colorless, transparent and non-toxic to humans and other characteristics, in the steel, glass, ceramics and other industries and scientific research, as an oil bath or thermostat in the heat carrier. With its good anti-shear properties, it can be used as hydraulic oil, especially aviation hydraulic oil. With its treatment of rayon spinning head, can eliminate static electricity, improve the quality of pumping. Adding silicone oil to cosmetics can improve the moisturizing and protective effect on the skin and so on.
As industrial MSG in the use of the process is often very critical, the choice of good quality and stable supply of silicone oil products to save energy and effort with half the effort!
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