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Preparation method for improving conductivity of composite epoxy resin matrix

An epoxy resin matrix and composite material technology, applied in the field of composite materials, can solve the problems of increasing aircraft mass, expensive carbon nanotubes, increased cost, etc., and achieves high performance and is conducive to wide application.

Pending Publication Date: 2020-09-08
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of composite materials can be protected by flame spraying conductive paint or adding metal mesh. The advantage of this protection method is that it improves the electrical conductivity of the material surface, but it will greatly increase the quality of the aircraft itself and increase the cost.
Coating carbon nanotubes on the surface of the material can also effectively enhance the overall electrical conductivity of the material, but the carbon nanotubes themselves are expensive and not suitable for large-scale coating on the surface of the aircraft

Method used

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  • Preparation method for improving conductivity of composite epoxy resin matrix
  • Preparation method for improving conductivity of composite epoxy resin matrix
  • Preparation method for improving conductivity of composite epoxy resin matrix

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the preparation method of improving the electrical conductivity of the composite material epoxy resin matrix specifically comprises the following steps:

[0024] S1 preliminary preparation: Weigh carbon fiber powder, epoxy resin, methyltetrahydrophthalic anhydride curing agent, DMP-30 accelerator and nitric acid in proportion; the carbon fiber powder, epoxy resin, methyltetrahydrophthalic anhydride The mass parts of diformic anhydride curing agent, DMP-30 accelerator and nitric acid are: 17.6 parts of carbon fiber powder, 44.1 parts of epoxy resin, 37.4 parts of methyltetrahydrophthalic anhydride curing agent, 0.9 parts of DMP-30 accelerator parts, 50 parts of nitric acid; wherein the carbon content in the carbon fiber powder is greater than 95%, and the particle diameter is less than 8 μm; the concentration of the nitric acid is 60%; wherein the model of the carbon fiber powder is T700, the density is 1.76, and the epoxy resin The model is Yueyang Petroch...

Embodiment 2

[0029] Embodiment 2: the preparation method of improving the conductivity of the epoxy resin matrix of the composite material specifically comprises the following steps:

[0030] S1 preliminary preparation: Weigh carbon fiber powder, epoxy resin, methyltetrahydrophthalic anhydride curing agent, DMP-30 accelerator and nitric acid in proportion; the carbon fiber powder, epoxy resin, methyltetrahydrophthalic anhydride The mass parts of dimethyl tetrahydrophthalic anhydride curing agent, DMP-30 accelerator and nitric acid are: 15 parts of carbon fiber powder, 40 parts of epoxy resin, 30 parts of methyl tetrahydrophthalic anhydride curing agent, 0.5 parts of DMP-30 accelerator parts, 42.6 parts of nitric acid; wherein the carbon content in the carbon fiber powder is greater than 95%, and the particle diameter is less than 8 μm; the concentration of the nitric acid is 60%; wherein the model of the carbon fiber powder is T700, the density is 1.76, and the epoxy resin The model is Yue...

Embodiment 3

[0035] Embodiment 3: the preparation method for improving the electrical conductivity of the composite epoxy resin matrix specifically comprises the following steps:

[0036] S1 preliminary preparation: Weigh carbon fiber powder, epoxy resin, methyltetrahydrophthalic anhydride curing agent, DMP-30 accelerator and nitric acid in proportion; the carbon fiber powder, epoxy resin, methyltetrahydrophthalic anhydride The mass parts of dimethyl tetrahydrophthalic anhydride curing agent, DMP-30 accelerator and nitric acid are: 20 parts of carbon fiber powder, 50 parts of epoxy resin, 40 parts of methyl tetrahydrophthalic anhydride curing agent, 1.5 parts of DMP-30 accelerator parts, 56.8 parts of nitric acid; wherein the carbon content in the carbon fiber powder is greater than 95%, and the particle diameter is less than 8 μm; the concentration of the nitric acid is 60%; wherein the model of the carbon fiber powder is T700, the density is 1.76, and the epoxy resin The model is Yueyang...

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Abstract

The invention relates to a preparation method for improving the conductivity of a composite epoxy resin matrix. The preparation method specifically comprises the following steps: S1, weighing raw materials in proportion, S2, putting carbon fiber powder into nitric acid, washing the carbon fiber powder with pure water to remove nitric acid, and putting the carbon fiber powder into a vacuum drying oven for drying treatment, S3, putting epoxy resin and a methyl tetrahydrophthalic anhydride curing agent into a flask, stirring and then adding DMP-30 into the flask, S4, treating the surface of a metal mold with ethyl alcohol, then putting the metal mold into a vacuum drying box to be dried, spraying a release agent to the surface of the metal mold, and then putting the metal mold into the vacuumdrying box again to be subjected to vulcanization treatment, and S5, adding the mixed solution of the carbon fiber powder and the epoxy resin matrix into a ball mill to be fully mixed, then introducing the fully mixed solution into the vulcanized metal mold to wait for molding, and carrying out demolding treatment after molding to obtain the modified epoxy resin matrix.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a preparation method for improving the conductivity of an epoxy resin matrix of a composite material. Background technique [0002] Carbon fiber composite materials are widely used in the production of aircraft parts. The amount of composite materials in the fuselage, wings, and empennage of the aircraft has accounted for more than 50% of the aircraft's weight. The use of composite materials can reduce the weight of the aircraft by more than 25%. . Lightning is a violent gas discharge phenomenon. During the discharge process, a lightning current of more than 200kA can be generated. According to statistics, an aircraft will encounter a lightning strike every 3,000 hours of flight. The conductivity of carbon fiber composites is lower than that of metals, and lightning strikes the composites will cause serious damage to the material. Therefore, it is very important to i...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K9/02C08K7/06B29C39/02B29C39/22B29C39/24B29C33/58B29B7/00B29B13/10
CPCC08K9/02C08K7/06B29C39/02B29C39/22B29C39/24B29C33/58B29B7/002B29B13/10C08K2201/001C08L63/00
Inventor 杜斌赵玉顺时宇杨克荣张松陶加贵刘屿
Owner HEFEI UNIV OF TECH
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