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Preparation method of carbon fiber/graphene/epoxy resin prepreg and carbon fiber composite material

A technology of epoxy resin and composite material, applied in the field of preparation of unidirectional carbon fiber/graphene/epoxy resin prepreg and carbon fiber composite material, can solve the problem of poor adhesion between wettability, few surface active functional groups, and interface bonding effect Poor and other problems, to achieve the effect of improving dispersibility, improving dispersibility, and good interfacial interaction

Inactive Publication Date: 2016-09-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In traditional composite materials, graphene, as a reinforcement of composite materials, has the disadvantages of poor dispersion in the polymer matrix and poor interfacial bonding with the polymer matrix, while carbon fiber, as a reinforcement, has the disadvantages of surface active functional groups. Less, poor bonding with matrix resin wettability and different degrees of defects, resulting in low interface bonding strength and poor mechanical properties of graphene or carbon fiber reinforced resin matrix composites. In addition, the traditional single-dimensional reinforced epoxy Resin composites sometimes lead to the decline of other properties while improving some properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh NaNO 3 The solid was dissolved in 98% concentrated sulfuric acid, and the mixture was placed in an ice-water bath while stirring to make the NaNO 3 The solid is fully dissolved; weigh a small amount of graphite and add it to the above mixed solution, and stir evenly; then, slowly add excess potassium permanganate for oxidation, and control the reaction temperature during the addition process to not exceed 20°C, stir evenly, and adjust the temperature to Continue to stir the reaction at 30°C; then add deionized water to the mixture to dilute and add H 2 o 2 , to make the solution turn bright yellow; filter and wash with 5% hydrochloric acid solution while filtering; dilute the filter cake obtained after filtration with deionized water, and then perform ultrasonic and centrifugation; the upper layer obtained after centrifugation Add hydrochloric acid solution to the clear liquid, stir well and centrifuge again; dry the viscous solid in the lower layer obtained aft...

Embodiment 2

[0035] Weigh NaNO 3 The solid was dissolved in 98% concentrated sulfuric acid, and the mixture was placed in an ice-water bath while stirring to make the NaNO 3 The solid is fully dissolved; weigh a small amount of graphite and add it to the above mixed solution, and stir evenly; then, slowly add excess potassium permanganate for oxidation, and control the reaction temperature during the addition process to not exceed 20°C, stir evenly, and adjust the temperature to Continue to stir the reaction at 40°C; then add deionized water to the mixture to dilute and add H 2 o 2 , to make the solution turn bright yellow; filter and wash with 5% hydrochloric acid solution while filtering; dilute the filter cake obtained after filtration with deionized water, and then perform ultrasonic and centrifugation; the upper layer obtained after centrifugation Add hydrochloric acid solution to the clear liquid, stir well and centrifuge again; dry the viscous solid in the lower layer obtained aft...

Embodiment 3

[0039] Weigh NaNO 3 The solid was dissolved in 98% concentrated sulfuric acid, and the mixture was placed in an ice-water bath while stirring to make the NaNO 3 The solid is fully dissolved; weigh a small amount of graphite and add it to the above mixed solution, and stir evenly; then, slowly add excess potassium permanganate for oxidation, and control the reaction temperature during the addition process to not exceed 20°C, stir evenly, and adjust the temperature to Continue to stir the reaction at 35°C; then add deionized water to the mixture to dilute and add H 2 o 2 , to make the solution turn bright yellow; filter and wash with 5% hydrochloric acid solution while filtering; dilute the filter cake obtained after filtration with deionized water, and then perform ultrasonic and centrifugation; the upper layer obtained after centrifugation Add hydrochloric acid solution to the clear liquid, stir well and centrifuge again; dry the viscous solid in the lower layer obtained aft...

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Abstract

A method for preparing carbon fiber / graphene / epoxy resin prepreg and carbon fiber composite materials, belonging to the field of carbon fiber composite material preparation. In this invention, graphene prepared by the modified Hummers method is surface modified, and -NH is grafted on the surface or edge of the graphene. 2 , improve its dispersion in the resin matrix, and at the same time, it can effectively increase the interfacial adhesion between micron-sized carbon fiber and epoxy resin matrix, reduce the existence of void defects, and thereby improve the mechanical properties of epoxy resin-based composite materials. The carbon fiber / graphene / epoxy resin composite material provided by the invention has optimal mechanical properties when the addition amount of graphene is 0.5wt%, with a bending strength of 1525.4MPa and an interlayer shear strength of 91.14MPa. Compared with carbon fiber reinforced rings, Oxygen resin composites improved by 15.41% and 14.14% respectively. The invention has the characteristics of simple process, low solvent toxicity, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a unidirectional carbon fiber / graphene / epoxy resin prepreg and a carbon fiber composite material. Background technique [0002] Carbon fiber reinforced resin composites (CFRP) have excellent specific strength, specific stiffness, corrosion resistance, fatigue resistance and high service temperature, and are widely used in aerospace, sports equipment and national defense industries. Epoxy resin is the most widely used matrix in carbon fiber reinforced resin composite materials. Epoxy resin has a series of advantages such as good adhesion, heat resistance, chemical corrosion resistance, high strength and convenient processing, but the elongation at break of the material It is relatively low and brittle, and the combination of its cured product and fibers is also poor, which seriously affects its application in aerospace. [0003] Prepreg is used...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L21/00C08K9/02C08K9/06C08K3/04C08K7/06C08J5/24
CPCC08L63/00C08J5/24
Inventor 赵东林张万欣林欢董惠王霞君
Owner BEIJING UNIV OF CHEM TECH
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