○ low surface tension
Low surface tension is a characteristic of silicone oils. Low surface tension means high surface activity. Therefore, silicone oil has excellent defoaming and anti-foaming properties, isolation properties from other substances and lubricating properties.
○ Non-toxic, odorless and physiologically inert
From a physiological point of view, silicone polymers are among the most inactive compounds known. Simethicone is inert to organisms and has no rejection reaction with animal organisms. Therefore, they have been widely used in departments such as surgery and internal medicine, medicine, food and cosmetics.
○ Good lubricity
Silicone oil has many excellent properties as a lubricant, such as high flash point, low freezing point, thermal stability, small change in viscosity with temperature, no corrosion of metals, no adverse effects on rubber, plastics, paints, organic paint films, and low surface tension. Easy to spread on the metal surface and other characteristics. In order to improve the steel-to-steel lubricity of silicone oil, lubricity additives that are miscible in silicone oil can be added. Introducing chlorophenyl into the siloxane chain or replacing dimethyl with trifluoropropylmethyl can greatly improve the lubricating properties of silicone oil.
○ Chemical properties
Silicone oil is relatively inert because the Si-C bond is very stable. But strong oxidizing agents are easy to interact with, especially at high temperatures. Silicone oil reacts violently with chlorine gas, especially methyl silicone oil. Sometimes there are explosive reactions. Si-O bonds are easily broken by strong bases or acids. Concentrated sulfuric acid reacts quickly at low temperatures, breaking and attaching siloxane chains. In this regard, silicone oils with higher alkane groups and phenyl groups are relatively stable, but concentrated sulfuric acid will break the benzene-silicon bond of the phenyl group and release benzene.