Continuous silicon rubber foam plate with low compression stress relaxation and preparation method of continuous silicon rubber foam plate
A technology of stress relaxation and silicone rubber, which is applied in the field of low compressive stress relaxation silicone rubber foam continuous sheet and its preparation, can solve the problem that the compressive stress relaxation performance of foam material cannot meet the requirements, the production of silicone rubber foam continuous sheet cannot be realized, and the production of silicone rubber foam continuous sheet cannot be obtained. Silicone rubber foam continuous sheet and other problems, to achieve the effect of low compressive stress relaxation, high production efficiency, uniform and small cells
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[0024] Example 1
[0025] Add methyl vinyl silicone rubber, fumed silica, AK foaming agent, benzoyl peroxide (BPO) to the internal mixer according to the weight ratio of each component in the formula in Table 1, and mix at room temperature After 30 minutes, add the evenly mixed rubber compound into the silicone rubber extruder, and obtain a flat rubber blank with the required width and thickness through the die. Finally, the flat continuous rubber blank is passed into the salt bath vulcanization tank for vulcanization and foaming, the salt bath temperature is controlled at 140-145°C, and the vulcanization and foaming time is 3 to 5 minutes.
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[0026] Example 2
[0027] According to the weight ratio of each component in the formula in Table 1, add methyl vinyl silicone rubber, fumed silica, AC blowing agent, 2,5-dimethyl-2,5-di to the internal mixer in sequence Tert-butylperoxy hexane (DBPMH), mixed at room temperature for 30 minutes, then add the uniformly mixed rubber to the silicone rubber extruder, and obtain the flat rubber blank with the required width and thickness through the die . Finally, the flat continuous rubber embryo is passed into the salt bath vulcanization tank for vulcanization and foaming. The temperature of the salt bath is controlled at 173-178°C, and the vulcanization and foaming time is 3 to 5 minutes.
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[0028] Examples 3-7
[0029] According to the weight ratio of each component in the formula in Table 1, add methyl vinyl silicone rubber, fumed silica, H blowing agent, dicumyl peroxide (DCP) and crosslinking aid to the internal mixer. Mix for 30 minutes at room temperature, then add the uniformly mixed rubber to the silicone rubber extruder, and obtain a flat rubber blank with the required width and thickness through the die. Finally, the flat continuous rubber blank is passed into the salt bath vulcanization tank for vulcanization and foaming, the salt bath temperature is controlled at 160-165°C, and the vulcanization and foaming time is 3 to 5 minutes.
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