Shaanxi BLOOM Tech Co., Ltd. is one of the most experienced manufacturers and suppliers of pure silicone oil cas 63148-62-9 in China. Welcome to wholesale bulk high quality pure silicone oil cas 63148-62-9 for sale here from our factory. Good service and reasonable price are available.
Pure silicone oil is generally colorless (or light yellow), tasteless, non-toxic and nonvolatile liquid. Silicone oil is insoluble in water, methanol, ethylene glycol and 2-ethoxyethanol. It is miscible with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene, and slightly soluble in acetone, dioxane, ethanol and butanol. It has very low vapor pressure, high flash point and ignition point, and low freezing point. With the different number of chain segments n, the molecular weight increases, and the viscosity also increases. This silicone oil can have various viscosities, from 0.65 centistokes to millions of centistokes. If low viscosity silicone oil is to be prepared, acidic clay can be used as catalyst, and the polymerization can be carried out at 180 ℃, or sulfuric acid can be used as catalyst, and the polymerization can be carried out at low temperature to produce high viscosity silicone oil or viscous substances with alkaline catalyst.
Silicone oil has heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and small surface tension. In addition, it has low viscosity temperature coefficient, high compression resistance, and some varieties also have radiation resistance.
Silicone oil usually refers to linear polysiloxane products that can be kept in liquid state at room temperature. It is generally divided into methyl silicone oil and modified silicone oil. The most commonly used silicone oil - methyl silicone oil, also known as ordinary silicone oil, whose organic groups are all methyl, has good chemical stability, insulation and hydrophobic properties. It is prepared by hydrolysis of dimethyldichlorosilane with water to obtain a primary polycondensation ring. The ring is cracked and rectified to obtain a low ring. Then the ring, capping agent and catalyst are put together for polymerization to obtain mixtures with different polymerization degrees. Silicon oil can be prepared by vacuum distillation to remove the low boiling matter.
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CF |
C6H18OSi2 |
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EM |
162 |
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MW |
162 |
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m/z |
162 (100.0%), 163 (10.2%), 164 (6.7%), 163 (6.5%) |
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EA |
C, 44.38; H, 11.17; O, 9.85; Si, 34.59 |
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Hazards: Silicone oil is used as a prosthetic product for female breast augmentation. After more than 40 years of use, in the early 1990s, it was found that silicone oil may cause the decline of human immune function or cause cancer and was banned in Europe and America. At that time, the company producing silicon gel prostheses in the United States was sued and lost a lot of money. In recent two years, it was found that the causes of cancer in women undergoing breast augmentation surgery were complex, and silicone oil was open to use in Europe, but it was still prohibited in the United States.
Some silicone oil based products are slightly corrosive, so more attention should be paid during transportation and production.
Pure silicone oil has various excellent properties and is widely used in electrical insulation, demolding, defoaming, damping, shock resistance, rolling, dust prevention, waterproofing, high and low humidity, and other aspects.
1. Application in the electromechanical industry:
Dimethyl silicone oil is widely used in motors, electrical appliances, and electronic instruments as an insulation medium that is resistant to temperature, arc corona, corrosion, moisture, and dust. It is also used as an impregnating agent for transformers, capacitors, and scanning transformers in televisions. Used as a liquid shock-absorbing and damping material in various precision machinery, instruments, and meters. The shock absorption performance of dimethyl silicone oil is less affected by temperature and is commonly used in instruments with strong mechanical vibrations and large environmental temperature changes, such as aircraft and automotive instruments. Used for shock absorption, damping, stabilizing instrument readings, and can also be used as a liquid spring in aircraft landing gear.
2. As a release agent:
Due to its non adhesiveness with rubber, plastic, metal, etc., this product is also used as a release agent for various rubber and plastic product molding processes, as well as in precision casting. Using it as a release agent not only facilitates demolding, but also makes the surface of the product clean, smooth, and with clear texture.
3. As a defoamer: Due to its low surface tension and insolubility in water, animal and vegetable oils, and high boiling mineral oils, this product has good chemical stability and is non-toxic. It has been widely used as a defoamer in industries such as petroleum, chemical, medical, pharmaceutical, food processing, textile, printing and dyeing, and papermaking. As long as 10-100PPM of silicone oil is added, it has a good defoaming effect.
4. Insulation, dustproof, and anti mold coating: Dip a layer of dimethyl silicone oil on the surface of glass and ceramics, and heat treat it at 250-300 ℃ to form a semi permanent waterproof, anti mold, and insulating film. Using it to treat insulating devices can improve their insulation performance: using it to treat optical instruments can prevent lens and prism from getting moldy; Using it to handle medication bottles can extend the shelf life of drugs without causing loss of the formulation due to wall sticking; Using it to treat the surface of film can provide lubrication, reduce friction, and extend the lifespan of the film.
5. As an additive: This product can be used as an additive for many materials, such as a brightening agent for paint. Adding a small amount of silicone oil to the paint can prevent it from floating or wrinkling, improve the brightness of the paint film. Adding a small amount of silicone oil to ink can improve printing quality. Adding a small amount of silicone oil to polishing oil (such as car varnish) can increase brightness, protect the paint film, and have excellent waterproof effect.
5. As an additive: This product can be used as an additive for many materials, such as a brightening agent for paint. Adding a small amount of silicone oil to the paint can prevent it from floating or wrinkling, improve the brightness of the paint film. Adding a small amount of silicone oil to ink can improve printing quality. Adding a small amount of silicone oil to polishing oil (such as car varnish) can increase brightness, protect the paint film, and have excellent waterproof effect.
6. Application in healthcare: Dimethyl silicone oil has no toxicity to the human body and is not decomposed by body fluids, so it is widely used in the healthcare industry. By utilizing its defoaming effect, oral gastrointestinal bloating tablets and pulmonary edema defoaming aerosols have been developed for medicinal purposes.
Adding pure silicone oil to ointment can enhance the drug's ability to penetrate the skin and improve its efficacy. Some ointments based on silicone oil have good therapeutic effects on burns, dermatitis, bedsores, etc. By utilizing the anticoagulant effect of silicone oil, it can be used to treat the surface of blood reservoirs and prolong the storage time of blood samples.
7. Other aspects: Dimethyl silicone oil has many other uses. By utilizing its high flash point, odorless, colorless, transparent, and non-toxic properties to the human body, it can be used as a heat carrier in industries such as steel, glass, ceramics, and scientific research as an oil bath or thermostat. Utilizing its good shear resistance, it can be used as hydraulic oil, especially aviation hydraulic oil. Using it to treat artificial silk spinning heads can eliminate static electricity and improve the quality of silk drawing. Adding silicone oil to cosmetics can enhance its moisturizing and protective effects on the skin, among other benefits.
Advantage
The viscosity temperature property is the best among liquid lubricants, and the viscosity changes little in a wide temperature range. Its freezing point is generally less than - 50 ℃, and some are as high as - 70 ℃. After long-term storage at low temperatures, the appearance and viscosity of the oil products do not change. It is a base oil with high temperature, low temperature and wide temperature range.
Excellent thermal oxidation stability, such as thermal decomposition temperature>300 ℃, small evaporation loss (150 ℃, 30 days, evaporation loss is only 2%), oxidation test (200 ℃, 72h), small changes in viscosity and acid value.
Excellent electrical insulation, volume resistance, etc. do not change in the range of normal temperature~130 ℃ (but no water in the oil).
It is a non-toxic oil with low foaming property and strong anti foaming property, which can be used as defoamer.
Excellent shear stability, with the function of absorbing vibration and preventing vibration transmission, it can be used as damping fluid.
Shortcoming
The lubricity of silicon oil is poor, especially for steel friction pairs.
The thermal expansion coefficient of silicone oil is large (overpressure may occur).
The gas solubility is high (it is difficult to design the gas seal device).
Certain hygroscopicity (water content higher than 100 × After 10-6, the electrical performance drops sharply).
Low surface tension (easy to leak from the machine).
There are two main methods for preparing silicone oil: hydrolysis condensation method and siloxane catalytic equilibrium method.
Method 1: Hydrolysis condensation method
Alcoholysis: Add 100 parts by weight of organic silicon high boiling material to the reaction kettle at 20 ℃ -25 ℃, and then drip 30-40 parts by weight of raw material methanol with a weight percentage of 80% -90%. Add the mixture dropwise for 6-8 hours, starting at a rate of 3 parts per hour, and gradually increasing to 10 parts per hour after 2-3 hours. The hydrogen chloride gas generated during the alcoholysis process is absorbed by spraying water.
Neutralization: At room temperature, add 15-18 parts by weight of methanol cosolvent and an equal amount of urea to the above material. The neutralization temperature is 42 ℃ -50 ℃, and the neutralization time is 0.5 hours to neutralize hydrochloric acid in the material. By layering, crude high boiling silicone oil was obtained, pH=4-5, Then add 1.0-1.5 parts by weight of 27% ammonia water and continue to neutralize to pH 6-8.
Filtering: Filter the neutralized material to obtain the finished silicone oil.
Method 2: Siloxane Catalytic Equilibrium Method
Ingredients: Add methylchlorosilane and hexamethyldisiloxane (MM) to the reaction vessel, with a mass ratio of 1: (1-2).
Reaction: Under stirring, slowly add concentrated sulfuric acid, then slowly add water, control the dripping speed of water, and allow the reaction to proceed at a certain temperature. After the reaction is complete, let the reactants stand and separate into layers, and wash the separated upper product with water until neutral.
Distillation: The pure silicone oil after washing with water is subjected to vacuum distillation, and the fractions within a certain temperature range are collected to obtain hydrogen containing silicone oil.
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