Silicone, the scientific name is generally called siloxane, polysiloxane. Silicone powder used on the market is generally produced with higher molecular weight organic silicone and silica, which is to disperse siloxane into silica, low molecular weight silicone is generally liquid, we commonly known as silicone oil. But if the molecular weight is large enough, it can be formed into a sheet-like solid state.
General silicone powder with siloxane content more and less to distinguish classification, if your silicone powder siloxane content is 40% namely silicone powder should be 40% siloxane (silicone oil) + 60% silica and other additives (such as coupling agent, etc.), if the silicone content is higher, weak shear is not easy to disperse, good make mother first, because siloxane intermolecular force is strong, not easy by physical method, need strong shear to complete. The higher the siloxane content in the silicone powder, the greater the viscosity of the material, and the less likely it is to disperse when used in plastic. When the content and molecular weight of siloxane are high, it can be used as wear agent, but then its lubrication performance is the opposite. The mechanism of lubrication is that the friction coefficient between silicone and silicone is small, and the silicone is stably dispersed into the system will have this phenomenon. If the system is not dispersed, it is not good lubrication. The so-called silicone mother particle, that is, the diluted silicone (generally with siloxane + silica) with 50% -30% carrier and other additives, the carrier is generally polyolefin, can be directly added as an inorganic filler infiltration agent use. General modified industry rarely directly uses silicone oil (low molecular weight siloxane), because of its dispersion defects. If directly use silicone oil need to ensure fully dispersed to have the ideal effect, is commonly used in elastomer to modify (such as SBS, SEBS), one can change its wear resistance, and can adjust its hardness, the process is usually called filling industry, this method of product using limitation is larger, easy to precipitate, which is usually called the oil.
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