Introduction to Phenyl Silicone Oil

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In last blog, we have mentioned some mechanism on special properties owned by silicone rubber. It is since we have introduced some specific types of silicone oil, it is necessary to talk on other subcategories as well. It is since silicone oil has been categorized into so many types of silicone oil, thus we will introduce them one by one. Today, we are going to introduce more on phenyl silicone oil- another type of important raw materials to real industry world.

Basis of Phenyl Silicone Oil

Phenyl silicone oil is the product of partial methyl substituted by phenyl in methyl silicone oil. Phenyl silicone oil (or Methyl Phenyl Silicone Oil) is just like other types of silicone oil. It is usually shown as the colorless or light yellow transparent oil. Its flash point is usually over 300℃. The freezing point of phenyl silicone oil is as low as -70℃, and its relative density is around 1.00-1.11, its refractive index 1.425-1.533.

Phenyl silicone oil has good thermal stability, the gel time of it in hot air is 1750h under the high temperature of  250℃, and it also has good radiation resistance and high oxidation stability, heat resistance, flame resistance, UV resistance and chemical resistance.

Phenyl silicone oil is a kind of polyorganosiloxane with chain structure of different degree of polymerization. It is prepared by hydrolysis of dimethyl dichlorosilane with water to obtain the initial polycondensation ring. The ring body is cracked and rectified to obtain the low ring body. Then the ring body, sealing agent and catalyst are mixed together to obtain various mixtures of different degree of polymerization. After the low boiling matter is removed by vacuum distillation, phenyl silicone oil can be prepared.

It can be prepared from the hydrolysates of octamethylcyclotetrasiloxane, dimethyltetraphenyldisiloxane, and methylphenyldiethoxysilane through the polymerization in the presence of catalyst. It is used as a carrier for lubricating oil, heat exchange fluid, insulating oil, gas liquid chromatography, etc. It is used for insulation, lubrication, damping, shockproof, dustproof and high-temperature heat carrier. It is an ideal liquid damping dielectric fluid for electronic instruments.

Methyl phenyl silicone oil has higher viscosity-temperature coefficient, lower freezing point and flash point than dimethyl silicone oil with the same viscosity, and its compressive resistance changes faster in viscosity under pressure. Low-phenyl silicone oil has remarkable low temperature resistance, and also has fluidity at -70℃. With the increase of phenyl mole fraction, the high temperature resistance, radiation resistance, lubricity and solubility in organic solvents of silicone oil are improved; however, low temperature resistance decreased.

There are also some common ways to make the identification of phenyl silicone oil:

1. Eye observation: pseudo-phenyl silicone oil will be dirty, smelly and smelly;

2. Use fire to test: use a glass rod or iron rod dipped with a small amount of phenyl silicone oil to light it. The white mineral oil that can light and emit black smoke is white mineral oil. The pure phenyl silicone oil will not burn when ignited by fire, and it is odorless, clear and transparent, and non-toxic. The ignition point of phenyl silicone oil is 320 degrees.

3. Freezing point test method: Phenyl silicone oil will not freeze at -50℃, and pseudo-phenyl silicone oil will be dirty or frozen.

Applications of Phenyl Silicone Oil

Phenyl silicone oil can be used in many fields of national life and production due to its excellent performance.

1. In the application field of methyl silicone oil, the use of methyl phenyl silicone oil can give play to its advantages of low temperature resistance, high temperature resistance, lubricity and solubility. Low-phenyl silicone oil is especially suitable for occasions requiring high cold resistance; Medium and high phenyl silicone oils have high thermal stability and good radiation resistance. They can be used as heat treatment bath for metal products, high temperature heating oil, gas chromatography carrier, high and low temperature lubricating oil for electronic and electrical equipment, and high temperature lubricating grease made of carbon black, lithium soap or molybdenum disulfide can be used for the lubrication of high temperature fan bearings, ball bearings, automobile engines, textile dryers and etc.

2. In addition, it is also widely used in hydraulic, instrument and electrical insulation. Phenyl vinyl silicone oil and phenyl hydrogen-containing silicone oil can be used to prepare high-temperature and irradiation resistant addition silicone rubber. Hydroxyl-terminated phenyl silicone oil as fabric finishing agent can significantly improve the smoothness and smoothness of the fabric, and give the fabric good hydrophobic and oil repellency. Using the good phase solubility of phenyl silicone oil as the internal additive of plastics can improve its processing performance.

3. Methyl Phenyl silicone oil has better compatibility with cosmetics ingredients than methyl silicone oil, is stable to heat and ultraviolet rays, and has unique luster. It is often used as an additive for skin care products, hair care products and other personal care products [. Silicone oil containing methyl phenyl siloxane can be used to prepare colorless transparent products with high phenyl content and moderate viscosity, and can be used as LED packaging materials with its characteristics of high transmittance, high refractive index, good thermal stability, and radiation resistance.

Summary

It is true that phenyl silicone oil does contain many advantages rather than other silicone oil. However, it is since phenyl silicone oil is applied widely in more advanced areas, the average price of phenyl silicone oil is averagely higher than other more common-seen type of silicone oil or other PDMS silicone oil liquid, which made many clients choose to purchase other low-cost raw materials rather than phenyl silicone oil.

Anyway, it is since its applying industries grow rapidly, the corresponding demands on phenyl silicone oil is also highly increasing and the manufacturing methods, number of suppliers, size of markets and other relevant fields are all expanding and the outstanding physical & chemical properties allow it to be so competitive in today’s chemical markets.