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Liquid crystal modified epoxy resin adhesive with conductive switching performance and preparation method thereof

A technology of epoxy resin glue and switch performance, applied in the direction of epoxy resin glue, conductive adhesive, adhesive, etc., can solve the problems of poor crack resistance, toughness and impact resistance, etc., to improve electrical conductivity and heat resistance Performance, the effect of improving the conductivity sensitivity

Active Publication Date: 2017-10-24
榕珍新材料科技发展(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the cured product is a three-dimensional network structure with high cross-linking density, the material has poor crack resistance, toughness and impact resistance, which limits its scope of use in some special fields, so it is necessary to toughen the epoxy resin modified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) In parts by weight, add 1 part of rod-shaped liquid crystals containing ester bonds with a bending angle of 100-150° and 1 part of toluene diisocyanate oligomer into 10 parts of methanol, fully stir and heat at 60°C Under the reaction for 2h, a curved liquid crystal oligomer is generated.

[0027] (2) Add the curved liquid crystal oligomer into isopropanol with a mass fraction of 40% epichlorohydrin, heat up to 50°C, stir and reflux for 30 minutes, and then add polyurethane with a ratio of -NCO / -OH of 2:1 For prepolymer, slowly add sodium hydroxide solution dropwise to adjust the pH to weak alkaline, then add 2-ethyl-4-methylimidazole and methyltetrahydrophthalic anhydride dropwise, stir evenly at high speed, and react at 110°C for 4h , the white precipitate filtered after the reaction, washed with a large amount of water and isopropanol, and dried in a vacuum oven to obtain a curved liquid crystal polyurethane modified epoxy resin, wherein the curved liquid crystal...

Embodiment 2

[0030] (1) In parts by weight, add 1 part of rod-shaped liquid crystals containing ester bonds with a bending angle of 100-150° and 2 parts of toluene diisocyanate oligomer into 15 parts of methanol, fully stir and heat at 60°C Under the reaction for 2h, a curved liquid crystal oligomer is generated.

[0031] (2) Add the curved liquid crystal oligomer into isopropanol with a mass fraction of 45% epichlorohydrin, heat up to 50°C, stir and reflux for 30 minutes, and then add polyurethane with a ratio of -NCO / -OH of 3:1 For prepolymer, slowly add sodium hydroxide solution dropwise to adjust the pH to weak alkalinity, then add 2-ethyl-4-methylimidazole and methyltetrahydrophthalic anhydride dropwise, stir evenly at high speed, and react at 150°C for 4h , the white precipitate filtered after the reaction, washed with a large amount of water and isopropanol, and dried in a vacuum oven to obtain a curved liquid crystal polyurethane modified epoxy resin, wherein the curved liquid crys...

Embodiment 3

[0034] (1) In parts by weight, add 1 part of rod-shaped liquid crystals containing ester bonds with a bending angle of 100-150° and 1.5 parts of toluene diisocyanate oligomer into 12 parts of methanol, fully stir and heat at 60°C Under the reaction for 2h, a curved liquid crystal oligomer is generated.

[0035] (2) Add the curved liquid crystal oligomer into isopropanol with a mass fraction of 43% epichlorohydrin, heat up to 50°C, stir and reflux for 30 minutes, and then add polyurethane with a ratio of -NCO / -OH of 2.5:1 For prepolymer, slowly add sodium hydroxide solution dropwise to adjust the pH to weak alkaline, then add 2-ethyl-4-methylimidazole and methyltetrahydrophthalic anhydride dropwise, stir evenly at high speed, and react at 120°C for 4h , the white precipitate filtered after the reaction, washed with a large amount of water and isopropanol, and dried in a vacuum oven to obtain a curved liquid crystal polyurethane modified epoxy resin, wherein the curved liquid cr...

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Abstract

The invention provides a liquid crystal modified epoxy resin adhesive with a conductive switching performance and a preparation method thereof. The liquid crystal modified epoxy resin adhesive is prepared from rod-like liquid crystal molecules having a bending angle of 100-150 degrees, toluene diisocynate oligomer liquid crystal modifier and polyurethane modified epoxy resin. The preparation method comprises the following steps: adding bend-shaped liquid crystal oligomer into isopropyl alcohol of epichlorohydrin, heating and stirring; adding polyurethane prepolymer, dropwise adding 2-ethyl-4-methylimidazole and methyl tetrahydrophthalic anhydride, shearing and stirring at high speed; heating to react, filtering, washing, precipitating and drying to obtain bend-shaped liquid crystal polyurethane modified epoxy resin; adding the bend-shaped polyurethane modified liquid crystal liquid epoxy resin, an activated carbon material and a curing agent DDS into a solvent, dissolving, and performing rotary evaporation to remove the solvent to obtain the liquid crystal modified epoxy resin adhesive with conductive switching performance. The adhesive has excellent conductivity and mechanical performance.

Description

technical field [0001] The invention belongs to the technical field of epoxy resin adhesive materials, and in particular relates to a liquid crystal modified epoxy resin adhesive with conductive switch performance and a preparation method thereof. Background technique [0002] Epoxy resin is a kind of thermosetting resin, which has the advantages of good bonding performance, high mechanical strength, good electrical insulation, and small curing shrinkage. It is widely used in machinery, electronics, aviation, aerospace, chemical industry, transportation, construction and other fields. . However, since the cured product is a three-dimensional network structure with high cross-linking density, the material has poor crack resistance, toughness and impact resistance, which limits its scope of use in some special fields, so it is necessary to toughen the epoxy resin modified. [0003] Compared with other toughened polymers, polymer liquid crystals have higher physical and mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J9/02C09J163/00C09J175/04C09J11/04C08G18/58C08G18/10C08G59/42
CPCC08G18/10C08G59/4215C08G59/4284C08K3/04C08K7/00C08K7/24C08K9/00C08K2201/011C09J9/02C09J11/04C09J163/00C09J175/04C08G18/58
Inventor 陈东进
Owner 榕珍新材料科技发展(上海)有限公司
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