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

Active Publication Date: 2020-04-24
ZHEJIANG FORST NEW MATERIAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the two-component silicone structural sealant is mixed and sizing in an environment exceeding 40°C, the reaction speed is fast, and problems such as cells, poor elastic recovery rate, weak strength, and low elongation are prone to occur

Method used

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  • High-temperature curable silicone structural sealant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a high-temperature curable silicone structural sealant and an application thereof. Through the matching design of the formula of a component A and a component B, an assistant with high activity and high stability is prepared from a silane coupling agent, a silane crosslinking agent and macromolecular modified resin, and the two-component silicone structural sealant is prepared through glue mixing and sizing under a wide temperature condition. The sealant disclosed by the invention can be used for mixing and sizing in a conventional temperature range environment; the sealant can be mixed and applied in a high-temperature environment, bubbles, particles and gel phenomena are avoided before the sealant is cured, foam holes, flooding and particles are avoided after thesealant is cured, and meanwhile the sealant has excellent long-term stability in the aspects of heat aging resistance, high and low temperature resistance, ultraviolet resistance, weather aging resistance, elastic recovery rate, displacement capacity and the like. The sealant provided by the invention can be used for mutual structural bonding of materials such as glass, aluminum profiles, steel, stone and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer sealants, in particular to a high-temperature curable silicone structural sealant and its application. Background technique [0002] With the continuous development and progress of science and technology, the application of adhesives in various fields has also expanded rapidly. Among them, silicone structural sealants are not only used in construction, Traditional application fields such as electronics and transportation are becoming more and more extensive, and applications in new industries such as photovoltaic installation and photovoltaic construction have also been rapidly expanded. [0003] Silicone structural sealants can be divided into one-component and two-component according to different components. The two-component type is more widely used in high-quality projects because of its more stable performance and controllable reaction kinetics. However, the application environment temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/04C09J183/12C09J183/06C09J11/04C09J11/08C09J11/06
CPCC08K2003/265C08K2201/011C08L2201/08C08L2205/025C08L2205/035C09J11/04C09J11/06C09J11/08C09J183/04C08L83/04C08L83/10C08K13/06C08K9/06C08K3/26C08K3/36C08K5/5419C08K3/04C08L83/12C08K9/04C08K5/544C08L83/06
Inventor 林维红江昊周光大林天翼
Owner ZHEJIANG FORST NEW MATERIAL RES INST CO LTD
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