The type of silicone is indeed related to high temperature resistance. Different types of silicone will show different high temperature resistance due to their different chemical structures, components and production processes.
1. Types of silicone
Silicone is mainly divided into two categories: organic silicone and inorganic silicone. Among them, organic silicone is a polysiloxane composed of silicon oxygen bonds (-Si-O-Si-) as the skeleton, which is the most studied and widely used type of silicone. According to the specific chemical structure and composition, organic silicone can be further subdivided into dimethyl silicone, methyl vinyl silicone, methyl phenyl vinyl silicone, etc.
2. High temperature resistance of different types of silicone
Dimethyl silicone: Dimethyl silicone is the earliest type of silicone to be put into economic activity production. It can maintain elasticity in the range of -60~200℃, has good aging resistance, electrical insulation performance, and excellent moisture and shock resistance. However, due to its low vulcanization activity and large deformation after high temperature compression, its high temperature resistance is relatively limited.
Methyl vinyl silicone: Methyl vinyl silicone has greatly improved the vulcanization processing performance of silicone due to the introduction of a small amount of vinyl in the macromolecular structure. Its high temperature resistance range can be extended to -60~260℃. It is easier to vulcanize than dimethyl silicone, has smaller compression deformation, better solvent expansion resistance and high pressure steam stability, and good cold resistance.
Methylphenyl vinyl silicone: Methylphenyl vinyl silicone is a product obtained by introducing methylphenylsiloxane links or diphenylsiloxane links into the molecular chain of methylvinyl silicone. Its high temperature resistance is further improved, and it also has excellent low temperature resistance, ablation resistance and radiation resistance. These properties vary with the different phenyl content in the molecular chain. Generally speaking, low phenyl silicone with a phenyl content of 510% is called low phenyl silicone, which has unique cold resistance and can maintain the elasticity of rubber at -70-100℃.
3. High temperature resistance of special silicone
In addition to the common types of silicone mentioned above, there are also some special silicones, such as high temperature resistant silicone, new flame retardant silicone, etc. These special silicones usually improve their high temperature resistance by adding special heat-resistant fillers, changing the chemical structure or adopting special production processes. For example, the temperature range of high temperature resistant silicone can reach -100~400℃, while the new flame retardant silicone can even withstand high temperatures up to 1500℃.
In summary, the type of silicone is closely related to high temperature resistance. When choosing silicone, the appropriate type and formula of silicone should be selected according to the specific application and needs to ensure its stability and durability in high temperature environments.