How to identify the difference between a good sili...

How to identify the difference between a good silicone silicone?       Silicone oil (Silicone oil) is also called silicone emulsion . Soap for bathing fluid. DC-344. Cyclic polydimethylsiloxane . Fluid is a degree of polymerization of a chain structure type polyorganosiloxane . 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 . Figure - silicone oil     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. Ye Jie Technology Co., Ltd. welcome new and old customers and dealers to negotiate business and cooperation agency . Let us join hands to create brilliant. you can email us info@szrl.net.