Dealcoholized silicone rubber sealant
A sealant, dimethyl silicone oil technology, used in adhesives, adhesive additives, polymer adhesive additives, etc., can solve the problems of unresearched initial curing speed and initial shear strength, and achieve excellent adhesion and The effect of curing speed, improving curing speed, good mechanical properties
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[0033] The present invention has no special restrictions on the preparation method of the sealant, and it can be prepared by the preparation method of the sealant well known to those skilled in the art. In the present invention, the preparation method of the sealant is preferably:
[0034] After mixing α,ω-dihydroxy polydimethylsiloxane, dimethyl silicone oil, calcium carbonate with the color paste, heating, vacuum dehydration, and cooling to obtain a mixture;
[0035] Mixing the mixture with the organosilicon crosslinking agent and the titanium-containing catalyst, and stirring under vacuum conditions to obtain a mixture;
[0036] Add silane coupling agent and polar group-modified polybutadiene to the mixture, stir and cool down under vacuum conditions to obtain a sealant.
[0037] In the present invention, the heating temperature is preferably 100 to 150°C, more preferably 120 to 130°C. In the present invention, the pressure of the vacuum dehydration is preferably -0.09MPa to 0.1MP...
Example Embodiment
[0039] Example 1
[0040] Set the kinematic viscosity to 20000mm 2 / s α,ω-dihydroxy polydimethylsiloxane, 350mm 2 / s dimethyl silicone oil, nano calcium carbonate, and white slurry are put into the high-speed dispersing planetary machine and stirred, while heating to 120℃, vacuum dehydration at -0.09~-0.1MPa for 3h, after the moisture is removed, the temperature will be lowered to 50℃ , Add methyltrimethoxysilane and ethyl acetoacetate titanium compound, stir evenly under vacuum conditions, then add epoxy oligomeric silane and maleic anhydride modified polybutadiene, stir evenly under vacuum The amount and source of the above-mentioned raw materials are shown in Table 1. Table 1 shows the amount and source of the raw materials used in Example 1 of the present invention.
[0041] Table 1 The amount and source of raw materials used in Example 1 of the present invention
[0042]
Example Embodiment
[0043] Example 2
[0044] Set the kinematic viscosity to 20000mm 2 / s α,ω-dihydroxy polydimethylsiloxane, 350mm 2 / s dimethyl silicone oil, nano-calcium carbonate, and black slurry are put into the high-speed dispersing planetary machine and stirred, while heating to 120℃, vacuum dehydration at -0.09~-0.1MPa for 3h, after the water is removed, the temperature is lowered to 50℃ , Add methyl trimethoxy silane, vinyl trimethoxy silane and ethyl acetoacetate titanium compound, stir well under vacuum conditions, then add epoxy oligomeric silane and maleic anhydride modified polybutadiene, Stir uniformly under vacuum conditions and then discharge to obtain a silicone rubber sealant. The content and source of the above-mentioned raw materials are shown in Table 2, which is the amount and source of raw materials used in Example 2 of the present invention.
[0045] Table 2 The amount and source of raw materials used in Example 2 of the present invention
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[0047]
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