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Method for improving interface toughness of carbon fiber reinforced epoxy resin matrix composite

A technology of epoxy resin and composite materials, applied in the direction of coating, etc., can solve the problems of poor interface toughness, etc., and achieve the effect of improved interface toughness, environmental friendliness, and simple method

Inactive Publication Date: 2015-02-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem of poor interface toughness of carbon fiber reinforced epoxy resin-based composite materials, thereby providing a method for improving the interface toughness of carbon fiber reinforced epoxy resin-based composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0012] Specific embodiment one: A kind of method of improving the interfacial toughness of carbon fiber reinforced epoxy resin matrix composite material of this embodiment is to carry out according to the following steps:

[0013] 1. Dissolve the thermoplastic resin in an organic solvent, stir and heat the thermoplastic resin at a temperature of 60-130°C until the thermoplastic resin is dissolved, then add additives to obtain a polymer solution; wherein, the mass ratio of the thermoplastic resin to the organic solvent is (0.001 ~0.05): 1, the mass ratio of additives and organic solvents is (0.001 ~ 0.03): 1;

[0014] 2. Put the polymer solution prepared in step 1 in the solution tank. The carbon fiber reinforced epoxy resin-based composite material first passes through the solution tank containing the polymer solution at a rate of 0.1-10m / s, and then passes through the solution tank with the polymer solution at a rate of 0.1-10m / s. The speed of s passes through a cleaning tank...

specific Embodiment approach 2

[0019] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, the thermoplastic resin is a soluble polyaryletherketone resin. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, the organic solvent is dimethylformamide (DMF), dimethylacetamide (DMAc), nitrogen methylpyrrolidone (NMP) or dimethylsulfoxide (DMSO). Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for improving interface toughness of a carbon fiber reinforced epoxy resin matrix composite and relates to a method for improving the interface toughness of a material. The method provided by the invention is used for solving the technical problem that the interface toughness of the carbon fiber reinforced epoxy resin matrix composite is poor. The method for improving the interface toughness of the carbon fiber reinforced epoxy resin matrix composite comprises the following steps of: firstly dissolving thermoplastic resin into an organic solvent, and then adding an auxiliary to prepare a polymer solution; secondly, adopting an impregnation method to cause the carbon fiber reinforced epoxy resin matrix composite to firstly pass through a solution trough filled with the polymer solution and then pass through a cleaning trough filled with a cleaning solution, and then drying, so that surface modification on carbon fibers used by the carbon fiber reinforced epoxy resin matrix composite is completed. By adopting the method for improving the interface toughness, the interface toughness of the carbon fiber reinforced epoxy resin matrix composite subjected to surface treatment is improved by more than 35%. The method for improving the interface toughness is applied to the field of surface and interface modification of materials.

Description

technical field [0001] The invention relates to a method for improving the interface toughness of materials. Background technique [0002] Carbon fiber reinforced epoxy resin-based composites are widely used in aerospace, sports and leisure products, civil engineering, electronic products, medical equipment and other fields due to their light weight, high strength, corrosion resistance and excellent weather resistance. However, since the cured epoxy resin molecules form a three-dimensional network structure, when microcracks are generated by external loads, the cracks are easy to expand and the toughness is poor; at the same time, the interface between the carbon fiber and the epoxy resin is connected by chemical bonding. Although the bonding strength is good, the fracture strain capacity of the interface is low, the ability to prevent crack propagation is poor, and the toughness of the interface is very poor. The low toughness interface will lead to brittle failure of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C08J7/00C08L63/00C08K9/10C08K7/06
Inventor 刘文博李晓琴王荣国郝立峰张舒杨帆矫维成
Owner HARBIN INST OF TECH
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