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High-temperature curing high-strength solid epoxy adhesive toughened by butyronitrile and preparation method thereof

A high-temperature curing, solid epoxy resin technology, used in epoxy resin adhesives, adhesives, carboxyl rubber adhesives, etc. The problems of poor compatibility of nitrile rubber blending and modification can improve the bonding strength and service life, increase the cross-linking point, and improve the insulation effect.

Inactive Publication Date: 2012-07-04
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention mainly solves the problem of poor bonding strength and poor service stability of existing rubber and epoxy resin blending modification and epoxy glue modified by ordinary epoxy resin and reactive rubber reaction and multifunctional epoxy resin and nitrile Problems such as poor compatibility of rubber blending modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1, accurately weigh 20 g of carboxyl-terminated liquid nitrile rubber with acrylonitrile content of 25% and a functionality of 1.8, 100 g of solid epoxy resin E-20, 3 g of liquid epoxy resin E-51, and 4 functional epoxy resins Add 7g of resin and 0.3g of catalyst triethylamine into the reaction kettle and heat up to 140°C. When the material in the kettle is completely in a liquid state, start stirring at a speed of 133rpm. After 1 hour of reaction, fill with nitrogen protection, and then react for 3 hours to control the acidity. When the value is below 1.0, lower the temperature to 90°C, add 1.5 g of silane coupling agent γ-aminopropyltriethoxysilane and 5 g of curing agent dicyandiamide, stir for 30 minutes, and discharge to obtain a solid glue.

[0018] Crush the solid glue into 80-mesh powder, heat-press it with glass fiber mesh cloth at 80-120°C and a pressure of 8-15MPa to form a rubber sheet for bonding between metal-metal structural parts.

Embodiment 2

[0019] Example 2, accurately weigh 15g of carboxyl-terminated liquid nitrile rubber with acrylonitrile content of 20%, functionality of 1.9, solid epoxy resin E-12 100g, liquid epoxy resin E-44 5g, 5-functionality epoxy resin Add 5g of resin and 0.5g of catalyst triethylamine into the reaction kettle, and heat up to 140°C. When the material in the kettle is completely in liquid state, start stirring at a speed of 140rpm. After 1 hour of reaction, fill with nitrogen protection, then react for 5 hours, and control the acidity. When the value is below 1.0, lower the temperature to 80°C, add 1.5 g of silane coupling agent γ-aminopropyltriethoxysilane and 5 g of curing agent dicyandiamide, stir for 30 minutes, and discharge to obtain a solid glue.

[0020] Crush the solid glue into 80-mesh powder, hot-press it with glass fiber mesh cloth at 80-120°C and a pressure of 8-15MPa to form a rubber sheet for bonding between metal-metal structural parts.

Embodiment 3

[0021] Example 3, accurately weigh 30g of carboxyl-terminated liquid nitrile rubber with acrylonitrile content of 30% and a functionality of 2.0, 100g of solid epoxy resin E-12, 8g of liquid epoxy resin shell828, and 3g of 4-functionality epoxy resin Add catalyst triethylamine 0.7g into the reaction kettle, heat up to 140°C, when the material in the kettle is completely in a liquid state, start stirring at a speed of 140rpm, fill the reaction with nitrogen protection after 1h, then react for 6h, and control the acid value at Below 1.0, lower the temperature to 100°C, add 1.5g of silane coupling agent γ-aminopropyltriethoxysilane and 5g of curing agent dicyandiamide, stir for 30min and discharge to obtain solid glue.

[0022] Mix the above solid glue and butanone to prepare a 20% solution, brush it to form a film, bake at 60°C for 30 minutes, and then cure at 180°C for 30 minutes to obtain a solid glue film, which can be used as a primer.

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Abstract

The invention discloses a high-temperature curing high-strength solid epoxy adhesive toughened by butyronitrile, which is characterized by comprising the following raw materials in parts by weight: 5-40 parts of carboxy-terminated butadiene nitrile liquid rubber, 100 parts of solid epoxy resins, 3-10 parts of liquid epoxy resins, 3-10 parts of multifunctional epoxy resins, 0-3 parts of catalysts,1-5 parts of silane coupling agents and 5-10 parts of curing agents. The preparation method comprises the following steps: adding the carboxy-terminated butadiene nitrile liquid rubber, the solid epoxy resins, the liquid epoxy resins, the multifunctional epoxy resins and the catalysts in the above raw materials into a reaction kettle to react, controlling the acid value below 1.0, finally adding the silane coupling agents to be mixed with the curing agents and obtaining the solid adhesive after cooling. The adhesive has high bond strength and insulating property in the temperature range from minus 50 DEG C to 200 DEG C, has excellent water-proof and oil-proof properties and is mainly used for adhesive bonding among metals when high-temperature curing is required, in particular being used for consolidating the high-speed railway track structures.

Description

Technical field: [0001] The invention relates to the technical field of adhesives, in particular to a high-temperature curing high-strength nitrile toughened solid epoxy adhesive and a preparation method thereof. Background technique: [0002] As a structural adhesive, epoxy resin has the disadvantages of high brittleness, shrinkage during curing, and large internal stress. People have long used elastomers to toughen epoxy adhesives to improve bonding performance and impact resistance, such as using nitrile rubber to toughen epoxy resins. Nitrile rubber is distributed in the epoxy continuous phase with particles to form a "sea island" structure, which can improve the toughness of the epoxy adhesive to a certain extent; there are also acrylic rubber and polyurethane modified epoxy resin, the above methods are mostly rubber and ring. Oxygen resin blending, the poor compatibility of this kind of toughening method may lead to phase separation. Another approach is to react reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/00C09J113/00
Inventor 王红玉王建斌解海华
Owner YANTAI DARBOND TECH
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