Preparation method of vermiculite-based high temperature-resistant sealing material
A sealing material and high-temperature-resistant technology, which is applied in the field of preparation of vermiculite-based high-temperature-resistant sealing materials, can solve the problems of flexible graphite gasket oxidation, weight loss of sealing materials, and reduced sealing performance, so as to facilitate dispersion, promote coating, and prevent The effect of reunion
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[0030] Example 1
[0031] This embodiment provides a preparation method for preparing vermiculite-based high temperature resistant sealing material:
[0032] 1) Ingredients formula
[0033] High temperature expanded vermiculite powder 500g, chemically expanded vermiculite powder 500g, modifier vinyl triethoxysilane (A151) 5g, nitrile rubber 30g, vulcanizing agent dicumyl peroxide (DCP) 2.5g.
[0034] 2) Preparation process
[0035] Add water to adjust the concentration of the mixture to 35%, send it to the vacuum kneader, add modifier A151 to modify at room temperature for 1.5h, add nitrile rubber and vulcanizing agent DCP, vacuum kneading for 1h to obtain a mixed vermiculite slurry, and then use the adjustable The film coater preforms the slurry with a doctor blade, and controls the drying temperature to 65°C. The drying time is 3 hours to obtain a vermiculite-based sealing material blank. The moisture content of the blank is 8%. The preformed blank is placed on a flat vulcanizer for ...
Example Embodiment
[0036] Example 2
[0037] This embodiment provides a preparation method for preparing vermiculite-based high temperature resistant sealing material:
[0038] 1) Ingredients formula
[0039] High temperature expanded vermiculite powder 250g, chemically expanded vermiculite powder 750g, modifier γ-mercaptopropyltrimethoxysilane (A189) 10g, styrene butadiene rubber 50g, vulcanizing agent sulfur 3g.
[0040] 2) Preparation process
[0041] Add water to adjust the mixture material concentration to 40%, send it to a vacuum kneader, add modifier A189 to modify at room temperature for 1.5h, add styrene butadiene rubber and sulfur vulcanizing agent, and knead in vacuum for 1.5h to obtain a mixed vermiculite slurry. The modulating coater preforms the slurry with a doctor blade, and controls the drying temperature to 70°C and the drying time for 2.5 hours to obtain a vermiculite-based sealing material blank. The moisture content of the blank is 8%. The preform is vulcanized on a flat plate. Vulc...
Example Embodiment
[0042] Example 3
[0043] This embodiment provides a preparation method for preparing vermiculite-based high temperature resistant sealing material:
[0044] 1) Ingredients formula
[0045] High temperature expanded vermiculite powder 750g, chemically expanded vermiculite powder 250g, modifier γ-aminopropyltriethoxysilane (A1100) 20g, organic silica gel 50g.
[0046] 2) Preparation process
[0047] Add water to adjust the concentration of the mixture to 45%, send it to the vacuum kneader, add modifier A1100 to modify at room temperature for 1 hour, add silicone rubber, and vacuum knead for 2 hours to obtain mixed vermiculite slurry, and then use an adjustable film coater to adjust the slurry The material is preformed with a scraper, and the drying temperature is controlled to 75°C, and the drying time is 2h to obtain a vermiculite-based sealing material blank. The moisture content of the blank is 8%. The preform is vulcanized on a flat vulcanizer at 180°C for 10 minutes to obtain the p...
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