Anti-settling high-hardness single-component room-temperature vulcanized silicone rubber for encapsulation and preparation method thereof
A technology of room temperature vulcanization and anti-sedimentation, which is applied in the direction of adhesives, non-polymer adhesive additives, adhesive additives, etc. It can solve the problems that affect the consistency of product performance, the inability to add a large amount of fillers, and low colloidal strength and hardness. Good environmental aging performance, good weather resistance, good fluidity effect
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Embodiment 1
[0017] 1. An anti-sedimentation high-hardness one-component room-temperature-vulcanized silicone rubber for potting in this embodiment, its raw material composition is as follows in parts by weight:
[0018]
[0019] in:
[0020] The modified nano-spherical barium sulfate is prepared by heating spherical barium sulfate with a particle size of 60-80 nanometers to 90°C and spraying it with isocyanatopropyl triethoxysilane;
[0021] In the silane coupling agent, the composition by weight is 1.4 parts of γ-mercaptopropyl trimethoxysilane, 0.7 parts of 2-(3,4-epoxycyclohexyl) base trimethoxysilane;
[0022] In the crosslinking agent, the composition in parts by weight is 6 parts of methyl tributylketoxime silane and 1 part of vinyl tributylketoxime silane.
[0023] 2. The preparation method of anti-sedimentation high-hardness one-component room temperature vulcanized silicone rubber for potting in this example is as follows:
[0024] According to the above raw material ratio, ...
Embodiment 2
[0026] 1. An anti-sedimentation high-hardness one-component room-temperature-vulcanized silicone rubber for potting in this embodiment, its raw material composition is as follows in parts by weight:
[0027]
[0028] in:
[0029] The modified nano-spherical barium sulfate is prepared by heating spherical barium sulfate with a particle size of 60-80 nanometers to 100°C and spraying with hexamethyldisilazane;
[0030] In the crosslinking agent, the composition in parts by weight is 8 parts of methyl tributylketoxime silane and 1 part of phenyl tributylketoxime silane.
[0031] 2. The preparation method of anti-sedimentation high-hardness one-component room temperature vulcanized silicone rubber for potting in this example is as follows:
[0032] According to the above raw material ratio, first add α, ω-terminated hydroxyl polydimethylsiloxane and modified nano-spherical barium sulfate into the planetary mixer, and stir for 40min at a vacuum degree of -0.09Mpa and a stirring ...
Embodiment 3
[0034] 1. An anti-sedimentation high-hardness one-component room-temperature-vulcanized silicone rubber for potting in this embodiment, its raw material composition is as follows in parts by weight:
[0035]
[0036] in:
[0037] The modified nano-spherical barium sulfate is prepared by heating spherical barium sulfate with a particle size of 60-80 nanometers to 80°C and spraying it with isocyanatopropyl triethoxysilane;
[0038] In the silane coupling agent, the composition by weight is 2 parts of γ-mercaptopropyl trimethoxysilane, 1 part of 2-(3,4-epoxycyclohexyl) ethyl trimethoxysilane;
[0039] In the crosslinking agent, the composition in parts by weight is 8 parts of methyl tributylketoxime silane and 1 part of phenyl tributylketoxime silane.
[0040] 2. The preparation method of anti-sedimentation high-hardness one-component room temperature vulcanized silicone rubber for potting in this example is as follows:
[0041] According to the above raw material ratio, fir...
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Abstract
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