Preparation process of low modulus waterproof silicone sealing material
A sealing material and preparation process technology, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of extrusion damage, neglect of multi-functional requirements, insufficient displacement ability, etc., and achieve excellent high and low temperature resistance, excellent The effect of stretch recovery and high elongation at break
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Embodiment 1
[0012] The preparation process of the low modulus waterproof silicone sealing material is completed through the following steps:
[0013] (1) Disperse 5 parts of polymethyltriethoxysiloxane into 25 parts of organosilane coupling agents containing cyano groups, and stir evenly to obtain a mixed solution;
[0014] (2) Add 30 parts of superfine activated calcium carbonate, 3 parts of diketoxime silane and 3 parts of ketoxime silane into the mixed solution, and mix uniformly for 10 minutes under vacuum condition;
[0015] (3) Add 1 part of organic tin carboxylate and chelate compound thereof in the mixed solution obtained in step 2, and mix evenly for 10 minutes again;
[0016] (4) Vacuum the mixed liquid to remove air bubbles, and remove part of the low-molecular substances generated in the reaction at the same time to obtain a low-modulus waterproof silicone sealing material.
Embodiment 2
[0018] The preparation process of the low modulus waterproof silicone sealing material is completed through the following steps:
[0019] (1) Disperse 10 parts of methyl-terminated polydimethylsiloxane into 35 parts of organosilane coupling agent containing secondary amino groups, and stir evenly to obtain a mixed solution;
[0020] (2) Add 40 parts of superfine activated calcium carbonate, 5 parts of diketoxime polysiloxane and 5 parts of ketoxime polysiloxane into the mixed solution, and mix uniformly for 20 minutes under vacuum condition;
[0021] (3) Add 3 parts of organic titanate and chelate compound thereof to the mixed solution obtained in step 2, and mix uniformly again for 20 minutes;
[0022] (4) Vacuum the mixed liquid to remove air bubbles, and remove part of the low-molecular substances generated in the reaction at the same time to obtain a low-modulus waterproof silicone sealing material.
[0023] After testing, the low-modulus waterproof silicone sealing mater...
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