Silicone Oil & Silicone Masterbatch
What is silicone?
Silicone, the scientific name is generally called silicone, polysiloxane, silicone powder used in the market is generally produced with higher molecular weight organic silicone plus silicon dioxide, that is, dispersed siloxane into the silicon dioxide, low molecular weight silicone is generally liquid, we commonly known as silicone oil. However, if the molecular weight is large enough, it can be made into flaky solid.
Silicone Powder and Silicone Masterbatch
What is Silicone Masterbatch? What is silicone powder? Actually, the distinction is quite simple. Ultra-high molar mass of polysiloxane is uniformly dispersed in particles or loaded on the surface of silica powder, the former is called silicone masterbatch, while the latter is called silicone powder.
General silicone powder to silicone content of more or less to distinguish the grading, if your silicone powder in the silicone content is 40%, that is, silicone powder should be 40% silicone (silicone oil) + 60% silica and other additives (such as coupling agent, etc.), if the content of silicone is relatively high, it is best to make the masterbatch first, because of the intermolecular forces of the silicone is strong, not easy to disperse uniformly through the physical method, you need to be strong shearing It needs strong shearing to be completed. The higher the siloxane content in the silicone powder, the greater the viscosity of the material, and the less easily dispersed when used in plastics. Siloxane content and high molecular weight can be used as wear-resistant agent, but then its lubricating properties on the contrary, the lubrication of the role of the mechanism is that the coefficient of friction between the silicone and the silicone is small, the silicone is stable and evenly dispersed into the system will have this phenomenon, if the system are dispersed in the system, it can not talk about lubrication is good.
The so-called silicone masterbatch, i.e., diluted silicone (generally still siloxane + silica) and then 50% -30% of the carrier and other additives, the carrier is generally polyolefin, can be added directly as an inorganic filler for the use of wetting agents.
Silicone masterbatch applied in plastics has excellent performance:
1, improve plastic processing fluidity and demolding. Reduce the torque, reduce equipment wear, easy to fill the mold, reduce the defective rate of products;
2、Significantly reduce the coefficient of friction, improve slipperiness, improve surface gloss, enhance the surface of the silk touch, improve scratch resistance;
3、Improve the flame retardancy, reduce the smoke density, improve the impact strength and surface gloss of flame retardant materials (highly filled);
4, good stability and non-migration;
5, silicone masterbatch is safe to use, easy to mix, stable performance, easy to disperse in the resin;
6, different additive amount has a direct impact on the performance, generally manifested in: low additive amount, will improve the plastic fluidity and internal smoothness, molding easier. When the addition amount is high, it will improve the surface properties of the material, including reducing the coefficient of friction and giving glossiness to the surface.
In some special fields, silicone masterbatch has good use effect:
1, in the halogen-free flame retardant wire and cable materials, can significantly improve the scratch resistance and prevent frost phenomenon.
2, in the automotive PP composite materials, can significantly improve the material’s scratch resistance, surface gloss and so on.
