Thermal silica is a thermal medium that reduces the thermal contact resistance between the heat source surface and the heatsink interface. In the industry, also known as thermal silica film, thermal pad silicone, soft thermal pad and so on. Different manufacturers of its thermal silica pad production process there are some differences.
Liquid thermal conductivity silicone gasket calender production process:
1, Raw material preparation
General organic silicone thermal conductivity is poor, the thermal conductivity is usually only about 0.2W / m · K. But in ordinary silica gel mixing heat-conducting filler can improve its thermal conductivity. Commonly used thermal fillers are metal oxides (such as Al2O3, MgO, BeO, etc.), metal nitrides (such as SiN, AlN, BN, etc.). The thermal conductivity of the filler is not only related to the material itself, but also closely related to the particle size distribution, morphology, interface contact, and the degree of bonding within the molecule of the thermal conductive filler. In general, fibrous or foil-like thermal fillers have better thermal conductivity.
2, Mixing, vacuuming
Mixing is a process of silicone processing, which refers to the use of mechanical or chemical methods to reduce the green glue molecular weight and viscosity to improve its plasticity, and get the appropriate fluidity to meet the needs of further processing of mixing and molding. Thermal silica pad production of raw materials is generally used mechanical high-speed stirring to destroy. After color mixing by the milky white silicone gel shift of various colors of the film.
3, Rolling forming
The mixed slurry is injected into the calendering tank through a vacuum pipe for precision calendering.
4, Curing
Calendering after high temperature curing stereotypes.
5, Trim cut
After the heat treatment of the thermal silica film to be placed in a period of time to let it cool down after the size of the cut, but can not use other rapid cooling. Otherwise it will directly affect the thermal conductivity of silicone pad product performance.
6, Finished product testing
The finished products need to test the main items include: thermal conductivity, temperature range, volume resistivity, voltage resistance, flame resistance, tensile strength, hardness, thickness and so on.
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