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Curing Silicone Rubber Requirements

Jul 10, 2017

Curing silicone rubber is a scientific name, a lot of people, also known as curing agent or hardener, in the operation of liquid silicone is mainly to liquid silicone solidified into a solid, the benefits of liquid plastic mold can be plastic, want him to become what shape Can only, you only have the corresponding mold.

1 estimate the amount of mold, mold silicone appearance is the flow of liquid, Condensation Cure Silicone Rubber the color is white or translucent, transparent and so on.

2A component is silica gel, component B is cured silicone rubber. With electronic weighing required to weigh the silica gel, and then a certain proportion of solidified silicone rubber

3 General curing silicone rubber is added 2% -3%, for example: take 100 grams of silica gel

4 glue and curing silicone rubber mixing evenly, (Note: silica gel and curing silicone rubber must be evenly stirred, if there is no mixing evenly, Condensation Cure Silicone Rubber the mold will appear a solid, one is not cured)

5 silicone will appear dry curing uneven situation will affect the life of the silicone mold and the number of times the mold, and even cause mold scrap situation.

6 will be a good mix of silica gel into the mold, such as silica gel curing, take mold, it is completed.

With the development of the electronics industry, electronic components and integrated circuits tend to be integrated and miniaturized, which puts forward higher requirements for thermal conductivity and insulation performance of silicone rubber. There is an urgent need to develop a kind of silicon wire with good thermal conductivity and insulation Rubber material. In this paper, α, ω-terminal hydroxyl polydimethylsiloxane as the base, tetramethoxysilane as the crosslinking agent, dibutyltin diacetate as the catalyst, Al2O3 as the main thermal filler, Condensation Cure Silicone Rubber AlN and SiC as the auxiliary thermal filler , ZnO, nano-TiO2, nano-SiO2 and nano-Al2O3 for anti-settling additives. The effects of the types of silicone oil, the type and amount of crosslinking agent, the type and amount of catalyst on the properties of cured silicone rubber were studied. It was found that the hydroxyl silicone oil with viscosity of 1000mPa-s was suitable as the base silicone oil; tetramethoxysilane as the crosslinking agent, the appropriate amount was 6 parts; dibutyltin diacetate and diacetylacetonate dibutyltin could be used as the catalyst, Condensation Cure Silicone Rubber Condensation Cure Silicone Rubber The amount of dibutyltin diacetate is 0.3 wt%, and the comprehensive performance of the cured silicone rubber is better. The effects of Al2O3 type, Al2O3 surface treatment and Al2O3 dosage on the properties of one - step thermal insulation silicone rubber were studied. The surface-treated 10 μmAl2O3 is more suitable as a thermally conductive filler than untreated 10 μm Al 2 O 3. With the increase of Al2O3 content, the mechanical strength, thermal conductivity, hardness and heat resistance of silicone rubber increased, and the volume resistivity and oil leakage rate decreased. But there is a step in the "viscosity rise", storage time is short, easy to settle and other shortcomings. The hydroxyl silicone oil was subjected to a methoxy-terminated prepolymer, and a thermally insulated silicone rubber was prepared by a two-step method using a prepolymer and a thermally conductive filler. Two-step method to improve the storage stability, Condensation Cure Silicone Rubber to solve the "viscosity peak" problem. The effect of Al2O3 / AIN compound filling and Al2O3 / SiC composite filling on the properties of silicone rubber was studied. It was found that the composite filling further improved the thermal conductivity, heat resistance and insulation performance. The effects of ZnO, nano - TiO2, nano - SiO2 and nano - Al2O3 on the anti - settling properties of silicone rubber were studied. The results show that when the loading amount of ZnO, nano-TiO2, nano-SiO2 and nano-Al2O3 is 8wt%, 0.8wt%, 0.8wt% and 0.5wt% respectively, the anti-settling property of silicone rubber can be improved to a certain extent Silicone rubber thermal conductivity, and the mechanical properties and insulation performance less affected. The silicone oil and the silicone oil were mixed with certain ratio as the matrix silicone oil to study the heat resistance of the pure silicone rubber. When the content of phenyl silicone oil is 10 wt%, the extrapolated decomposition temperature of silicone rubber reaches 467.4 ℃, which is 67 ℃ higher than that without adding phenyl silicone oil. The thermal conductivity of the product reached 0.75 W / (m.K), the volume resistivity was 8.3 × 1011Ω · m, and the breakdown voltage was 15 kV / mm, which was in accordance with the requirements of product use.