Butadiene-acrylonitrile toughened epoxy adhesive

A technology of tough epoxy and nitrile, which is applied in the field of preparation of nitrile toughened epoxy adhesive, can solve the problem of poor compatibility of epoxy resin and nitrile rubber modification, and the blending and modification phase of epoxy resin and nitrile rubber. Poor compatibility and other problems, to achieve the effect of solving poor compatibility

Inactive Publication Date: 2017-05-03
王绚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a kind of preparation method of nitrile toughened epoxy glue, solve the problems such as poor compatibility of epoxy resin and nitrile rubber blending modification
[0005] The beneficial effect of the present invention is: solving the problems such as poor compatibility of epoxy resin and nitrile rubber blending modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Accurately weigh 25 g of carboxyl-terminated liquid nitrile rubber with an 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 7 g of 4-functional epoxy resin g and catalyst triethylamine 0.3g, put 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 133rpm, fill with nitrogen protection after reacting for 1h, then react for 3h, and control the acid value Below 1.0, lower the temperature to 90°C, add 1.5g of silane coupling agent γ-aminopropyltriethoxysilane and 5g of curing agent dicyandiamide, stir for 40min and discharge to obtain solid glue.

Embodiment 2

[0010] Accurately weigh 20 g of carboxyl-terminated liquid nitrile rubber with an 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 7 g of 4-functional epoxy resin g and catalyst triethylamine 0.3g, put 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 133rpm, fill with nitrogen protection after reacting for 1h, then react for 3h, and control the acid value Below 1.0, lower the temperature to 80°C, add 1.5g of silane coupling agent γ-aminopropyltriethoxysilane and 5g of curing agent dicyandiamide, stir for 30min, and discharge to obtain a solid glue.

Embodiment 3

[0012] Accurately weigh 30 g of carboxyl-terminated liquid nitrile rubber with an 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 7 g of 4-functional epoxy resin g and catalyst triethylamine 0.3g, put into the reaction kettle, heat up to 150°C, when the material in the kettle is completely in a liquid state, start stirring at a speed of 133rpm, fill with nitrogen protection after reacting for 1h, then react for 3h, and control the acid value Below 1.0, lower the temperature to 90°C, add 1.5g of silane coupling agent γ-aminopropyltriethoxysilane and 5g of curing agent dicyandiamide, stir for 50min and discharge to obtain solid glue.

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PUM

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Abstract

The invention relates to a preparing method of a butadiene-acrylonitrile toughened epoxy adhesive. According to the technical scheme, the preparing method comprises the following steps: accurately weighing 20-30g of 1.8-functionality terminal carboxyl-based liquid butadiene-acrylonitrile rubber with 25% of acrylonitrile, 100g of solid epoxy resin E-20, 3g of liquid epoxy resin E-51, 7g of 4-functionality epoxy resin and 0.3g of a triethylamine catalyst; adding the raw materials into a reactor, and raising a temperature to 140-150DEG C; when the materials in the reactor are fully in a liquid state, beginning stirring, and enabling a rotating speed to be 133rpm; after reaction is carried out for 1h, filling nitrogen for protection; after reaction is carried out for 3h, controlling an acid value below 1.0, and lowering the temperature to 80-90DEG C; adding 1.5g of a silane coupling agent, namely gamma-aminopropyl trisethoxy silane, and 5g of a dicyandiamide curing agent; and after stirring for 30-50min, carrying out discharging so as to obtain a solid adhesive.

Description

technical field [0001] The invention relates to the preparation of a nitrile toughened epoxy adhesive, which belongs to the field of adhesives. 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 reactive rubber with epoxy resin to introduce the rubber into the epoxy re...

Claims

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Application Information

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IPC IPC(8): C09J163/00C09J11/08C09J11/06
Inventor 王绚
Owner 王绚
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