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The Role of Silicone Fluid in Lubricating Oil


Silicone fluid usually refers to the linear polysiloxane products that maintain liquid state at room temperature. It is generally colorless (or light yellow), tasteless, non-toxic, non-volatile liquid, insoluble in water, methanol, ethylene glycol, and can be intersoluble with benzene, dimethyl ether, carbon tetrachloride or kerosene, slightly soluble in acetone, dioxane, ethanol and butanol.


1. Classification and function of silicone fluid


(1) According to the chemical structure, silicone fluid includes methyl silicone fluids, ethyl silicone fluid, phenyl silicone fluid, methyl hydrogen silicone fluid, phenyl methyl silicone fluid. methyl chlorophenyl silicone fluid, methyl-ethyloxy silicone fluid, methyl trifluoropropyl silicone fluid, methyl vinyl silicone fluid, methyl hydroxy silicone fluid, ethyl hydrogen silicone fluid, hydroxy hydrogen silicone fluid, cyanide silicone fluid, etc. According to the use, silicone fluid includes damping silicone fluid, diffusion pump silicone fluid, hydraulic oil, insulation oil, heat transfer oil, brake oil, etc.


According to the processing status, silicone fluid can be divided into primary products and secondary products. Primary products refer to the silicone fluid products before processing, including four categories of hydroxy silicone fluid, silicone functional silicone fluid, carbon functional silicone fluid and non-reactive modified silicone fluid. Traditionally, the first two types are called linear silicone fluids, and the latter two are called modified silicone fluids. Secondary products are grease, emulsion and solution (such as silicone grease, silicone paste, defoamer, release agent and parting agent), which are made of silicone fluid as a raw material, mixed with thickeners, surfactants, solvents and additives, and processed by a specific process.


2. The matching method of silicone fluid


Silicone fluid is often not used alone or used as a raw material, but is used as an auxiliary material, which is made through a special formular, to produce a certain effect. Generally speaking, there are three basic forms of silicone fluid on the market: silicone oil, solution and emulsion. Silicone fluid is very stable, heat-resistant, frost-resistant, and has a high flash point and high ignition point, which make it suitable for storage and has few problems in storage and transportation. In fact, it is often necessary to dilute the silicone fluid solution, and it is not convenient for users to configure the solution by themselves. When in use, it is sometimes desirable to add active auxiliary agents (catalysts, crosslinking agents, etc.) to the solution to facilitate storage and use. Aliphatic, aromatic or chlorinated hydrocarbon can be used as solvents as required.


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