Oil is a kind of linear small molecule silicone polymer with Si-O-Si as the main chain and organic groups in the side chain. It is widely used in textile, daily chemical, mechanical processing, chemical, electrical and electronic, medical and health, etc. industry. Silicon oil is usually kept in a liquid state at room temperature. As the molecular weight increases, the viscosity also increases, so viscosity is an important physical property index of silicone oil.






2017 China's silicone oil consumption














Classification of silicone oil


Silicone oil is generally divided into two categories: general purpose silicone oil and modified silicone oil.






There is also a class of co-modified silicone oils and derivatives - ternary modified silicone oil










Silicone oil properties


Silicone oil is generally a colorless, odorless, non-toxic, non-volatile liquid with the following characteristics.


1, good heat resistance


The Si-O-Si-bond energy is 108 kcal/mol, which can be used for a long time at -60 to 220 °C; the introduction of phenyl groups is resistant to low and high temperatures.


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2, oxidation resistance and weather resistance are good


It is only oxidized at 200 ° C. The addition of antioxidants can significantly prolong the high temperature gelation time of silicone oil.


3, good electrical insulation


It has good dielectric properties and its electrical properties change little with changes in temperature and cycle number. For example, the dielectric constant is 2.76; the volume resistivity decreases with increasing temperature.


4, good hydrophobicity


The main chain is composed of a polar silicon-oxygen chain, and the side chain is a non-polar alkyl group oriented outward to effectively prevent the entry of water molecules. The interfacial tension of silicone oil to water is about 42 dynes/cm.


5, the viscosity temperature coefficient is small


It is the material with the best viscosity-temperature characteristics among various liquid lubricants.


6, high resistance to compression


Viscosity varies greatly with increasing pressure, but is lower than typical mineral oil. For example, at 2000 atmospheres, the viscosity of petroleum rises.


50 to 5000 times, while the viscosity of silicone oil is increased by 10 times


7, low surface tension


The surface tension is generally between 20.8 and 21.1 dynes/cm; the water is 72 dynes/cm, the ethanol is 22.3 dynes/cm, and the mineral oil is 30 to 35 dynes/cm. Has good defoaming properties, isolation and lubrication properties with other materials


8, non-toxic, tasteless and physiologically inert


It is one of the most inactive compounds known and has no rejection reaction with animal organisms.


9, good lubricity


No adverse reactions to rubber, plastics, paints, etc.; Newtonian fluid, less change in viscosity under high shear; introduction of chlorophenyl or methyl group with trifluoropropyl to improve lubrication performance


10. Chemical properties


Silicon-oxygen bonds are not resistant to strong acids and bases; insoluble in water or aqueous solvents; aromatic, aliphatic and chlorinated hydrocarbons are the best solvents; they are also soluble in ethers, esters, higher alcohols and ketones.






Silicone secondary processing products


Definition: Silicone oil as raw material or main agent, adding thickener, surfactant, solvent, filler and various performance improvers, etc., after preparation, compound, emulsion, solution and other products, called silicone oil Secondary processed products.






 






Silicone oil product standard


1. Technical indicators of silicone oil






2, silicone oil testing content






3, product standards


















Silicone oil production technology






1, methyl silicone oil






















2, hydroxy silicone oil










3. Polyether modified silicone oil














4, amino modified polyether silicone oil














5, silicone grease, silicone paste










6, defoamer