High-temperature curable silicone structural sealant and application thereof
A high-temperature curing and sealant technology, applied in the direction of adhesives, polymer adhesive additives, non-polymer adhesive additives, etc., can solve the problems of poor elastic recovery rate, fast response speed, low elongation, etc., to achieve Improved stability, elimination of cells, and high thermal stability
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Embodiment 1
[0077] Preparation of modified additives:
[0078] (1) In a reaction kettle equipped with a thermometer, a reflux condenser, and a stirrer, first add 25 wt % of propyltrimethoxysilane, 10 wt % of propyltriethoxysilane, and 25 wt % of 3-(2 , 3-glycidyloxypropoxy)propyltriethoxysilane, 25wt% of 3-aminopropyltrimethoxysilane, 12wt% of 3-aminopropyltriethoxysilane, slowly warming up to 55°C, react for 2 hours;
[0079] (2) Slowly raise the temperature to 150°C, and add 3wt% hydroxyl-terminated liquid polybutadiene resin with a viscosity of 10000cs into the reaction kettle while stirring;
[0080] (3) In the reflux state, continue to react for 10 hours while stirring, and cool naturally to 25~30°C with nitrogen gas, then discharge the material to prepare the additive.
[0081] Prepare component A:
[0082] 30 wt % of hydroxy-terminated polydimethylsiloxane with a viscosity of 20000 cs, 10 wt % of hydroxyl-modified silicone oil with a viscosity of 8000 cs, 1 wt % of methyltrimeth...
Embodiment 2
[0087] Preparation of modified additives:
[0088] (1) In a reaction kettle equipped with a thermometer, a reflux condenser, and a stirrer, first add 30 wt % of propyltrimethoxysilane, 20 wt % of 3-(2,3-glycidyloxy) propyltri Ethoxysilane, 17wt% of 3-aminopropyltrimethoxysilane, 23wt% of 3-aminopropyltriethoxysilane, slowly heated to 60°C while stirring, and reacted for 1.5 hours;
[0089] (2) Slowly raise the temperature to 130°C, and add 10wt% silane-modified polyether resin with a viscosity of 3500cs into the reaction kettle while stirring;
[0090] (3) In the reflux state, continue to react for 18 hours while stirring, and cool naturally to 25~30°C with nitrogen gas, and discharge the material to prepare the auxiliary agent.
[0091] Prepare component A:
[0092] 50 wt % of hydroxyl-terminated polydimethylsiloxane with a viscosity of 1000 cs, 5 wt % of polyether modified silicone oil with a viscosity of 10000 cs, 5 wt % of propyltrimethoxysilane coupling agent and 30 wt ...
Embodiment 3
[0097] Preparation of modified additives:
[0098] (1) In a reaction kettle equipped with a thermometer, a reflux condenser, and a stirrer, first add 36 wt% of propyltrimethoxysilane, 6wt% of propyltriethoxysilane, and 5wt% of 3-(2 , 3-glycidoxy) propyltriethoxysilane, 23wt% of 3-aminopropyltrimethoxysilane, 24wt% of 3-aminopropyltriethoxysilane, then slowly heat up to 75°C, react for 2 hours;
[0099] (2) Slowly raise the temperature to 100°C, and add 6wt% silane-modified polyurethane resin with a viscosity of 2000cs into the reaction kettle while stirring;
[0100] (3) In the reflux state, continue to react for 24 hours while stirring, and cool naturally to 25~30°C with nitrogen gas, then discharge the material to prepare the additive.
[0101] Prepare component A:
[0102]24 wt% of the viscosity of 100000cs hydroxyl-terminated polydimethylsiloxane, 6wt% of the viscosity of 500cs alkoxy-modified silicone oil, 5wt% of methyltriethoxysilane, 5wt% of 3-aminopropyl Active si...
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