Silicone sealant and preparation method thereof and photovoltaic module
A silicone sealant and photovoltaic module technology, which is applied in photovoltaic power generation, adhesives, electrical components, etc., can solve the problems of difficult extrusion and curing, and achieve the effects of improved dispersion, excellent mechanical properties, and improved extrusion difficulties
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[0050] The present invention also provides a preparation method of the silicone sealant, comprising the following steps:
[0051] S10, mix the α,ω-dihydroxy polydimethylsiloxane, calcium carbonate filler and polycarboxylate superplasticizer, react at 60°C~80°C for 90min~120min, and heat up to 120°C~130°C ℃, react in a vacuum environment for 120min~180min, and cool to normal temperature to obtain a base material; and
[0052] S20, in a vacuum environment, the crosslinking agent, the coupling agent and the catalyst are sequentially added to the base material.
[0053] Preferably, step S20 further includes the following steps:
[0054] S21, in a vacuum environment, add a crosslinking agent to the base material for stirring, the rotating speed is 15HZ~20HZ, and the stirring time is 10min~20min;
[0055] S22, adding the coupling agent and the catalyst to the base material after adding the crosslinking agent, and stirring, the rotating speed is 15HZ~20HZ, and the stirring time is ...
Embodiment 1
[0060] (1) 100 parts by weight of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 50000mpa.s at 25°C, 126 parts by weight of nano-active calcium carbonate, and 14 parts by weight of ordinary heavy calcium carbonate, 0.7 parts by weight of -Ⅰ was added to the vacuum kneader, kept the temperature at 70°C, stirred at a high speed for 100min, heated to 130°C, opened the vacuum at the same time, the degree of vacuum was -0.095MPa, stirred at a high speed for 120min, cooled to room temperature to obtain the base material .
[0061] (2) put the above-mentioned base material, and 4 parts by weight of tetrabutyl ketoximo silane, 3 parts by weight of methyltributanone oximo silane, 3 parts by weight of vinyl tributyl ketoximo silane, put it into the planetary mixer, and control the water cooling At room temperature, keep the vacuum degree -0.095MPa, rotate speed 17HZ, after stirring for 10min, continue to add the composition of γ-(2,3 glycidoxy)propyltrimethoxysilane and γ-amino...
Embodiment 2
[0063] (1) 100 parts by weight of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 50000mpa.s at 25°C, 98 parts by weight of nano-active calcium carbonate, and 42 parts by weight of ordinary heavy calcium carbonate, 0.8 parts by weight of -Ⅰ was added into the vacuum kneader, kept the temperature at 70°C, stirred at a high speed for 100min, heated to 130°C, opened the vacuum at the same time, the degree of vacuum was -0.095MPa, stirred at a high speed for 120min, cooled to room temperature to obtain the base material .
[0064] (2) put the above-mentioned base material, and 4 parts by weight of tetrabutyl ketoximo silane, 3 parts by weight of methyltributanone oximo silane, 3 parts by weight of vinyl tributyl ketoximo silane, put it into the planetary mixer, and control the water cooling At room temperature, keep the vacuum degree -0.095MPa, rotate speed 17HZ, after stirring for 10min, continue to add the composition of γ-(2,3 glycidoxy)propyltrimethoxysilane and γ-amin...
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