How to identify the difference between a good silicone Oil?

It is dimethyldichlorosilane First water hydrolysis condensation ring body , the ring body by cracking distillation to obtain the low ring body , the ring and the body head , a catalyst can be put together to give the telomerization a mixture of different degrees of polymerization by distillation under reduced pressure to remove low boiling silicone oils can be prepared .

 The most common silicone oils, all organic groups are methyl , said methyl silicone . The organic group may be used instead of part of an organic group other methyl group of the silicone oil to improve the performance and application of a variety of different purposes. Other groups are common hydrogen , ethyl , phenyl, chlorophenyl group , a trifluoromethyl group and the like . In recent years, the rapid development of organically modified silicone oil , a number of organically modified silicone oil has special properties.

    Silicone has excellent heat resistance, electrical insulation , weather resistance , hydrophobicity, physiologically inert and smaller surface tension , in addition to having a low viscosity-temperature coefficient, high resistance to compression ) and some species are also resistant to radiation performance.

    Advantages of silicone oil

    ( 1 ) liquid lubricant viscosity-temperature performance is the best in the wide temperature range of small viscosity change . Its pour point is generally less than -50 ℃, some as high as -70 ℃, long-term storage at low temperatures , the appearance of the oil , the viscosity change, which is a high temperature , low temperature , wide range of both the base oil. ( 2 ) excellent thermal oxidation stability , such as thermal decomposition temperature > 300 ℃, evaporation loss (150 ℃, 30 days, the evaporation loss of only 2% ) , oxidation test (200 ℃, 72h), changes in viscosity and acid number small .

    ( 3 ) excellent electrical insulating properties , such a volume resistivity in the range of ~ 130 ℃ temperature does not change ( in oil but not water ) .

    ( 4 ) It is a non-toxic and low foaming , anti-foam and strong oil , can be used as defoamers used.

    ( 5 ) excellent shear stability, vibration absorption , prevent vibration transmission function can be used for damping fluid.

    The disadvantage of silicone oil

    ( A ) the silicone oil lubrication poor , especially for the lubrication of friction Steel Steel poor .

    ( 2 ) large thermal expansion coefficient of the silicone oil ( overpressure may arise ) .

    ( 3 ) gas solubility large ( difficult to design gas seals ) .

    ( Water content is higher than 100 × 10-6 after a sharp decline in electrical properties ) ( 4 ) certain hygroscopic.

    ( 5 ) surface tension ( easy to leak from the machine ) .

    The three kinds of genuine silicone identification method:

    ( 1 ) eye observation: fake silicone oil would be more turbid, the smell is relatively large , the smell ;

    ( 2 ) the use of fire to test : an iron bar with a glass rod or stick a small amount of silicone oil ignited, can ignite and black smoke is white mineral oil, pure silicone oil is ignited with fire will not burn , and odorless , clear, transparent , non- poison. Silicone ignition is 320 degrees.

    ( 3 ) freezing point test: -50 degrees silicone does not appear in the freezing conditions, fake silicone oil appears cloudy or freezing conditions.