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A method for improving the impact strength of epoxy resin carbon fiber composites

A technology of epoxy resin and composite materials, which is applied in the field of carbon fiber composite materials, can solve the problems of poor compatibility between modified materials and epoxy resin, and achieve compatibility and impact resistance, simple preparation method, and high impact resistance. Improved effect

Active Publication Date: 2017-01-11
WUHU LION AUTOMOTIVE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can undoubtedly improve the impact strength of composite materials to a certain extent, but they all have the defect of poor compatibility between modified materials and epoxy resins.

Method used

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  • A method for improving the impact strength of epoxy resin carbon fiber composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: (1) Soak the carbon fiber arrangement in acetone for 2 hours to remove small organic molecules, then take it out and place it in a vacuum drying oven for drying, and store it at a temperature of 50°C for 30 minutes; (2) The viscosity is 2300mPa. S bisphenol F epoxy resin with N,N,N',N'-tetraglycidyl-1,3-diaminopropyl-1,1,3,3-tetramethyldisiloxane according to 100 : Mix and stir evenly at a mass ratio of 5, then add 30mt% m-xylylenediamine and stir evenly, and finally add 20mt% acetone as a diluent to reduce the viscosity of the mixed system to 750mPa.S; (3) Vacuum bag pressure method The carbon fiber is infiltrated with the above resin mixture, and then cured according to the curing process of 80 / 1h+120 / 2h+150 / 2h to obtain an epoxy resin / carbon fiber composite material with a fiber content of 55%. At the same time, a blank comparison sample was prepared, and the results showed that the impact strength of the modified composite material increased by 18%.

Embodiment 2

[0020] Example 2: (1) Soak the carbon fiber arrangement in the organic solvent acetone for 2 hours to remove small organic molecules, then take it out and place it in a vacuum drying oven for drying, and store it at a temperature of 75°C for 60 minutes; (2) The viscosity is 3500mPa.S bisphenol A epoxy resin and N,N,N',N'-tetraglycidyl-1,3-diaminopropyl-1,1,3,3-tetramethyldisiloxane Mix and stir evenly according to the mass ratio of 100:15, then add 25mt% diethylenetriamine and stir evenly, and finally add 15mt% acetone as a diluent to reduce the viscosity of the mixed system to 500mPa.S; (3) Use vacuum bag pressure The carbon fiber is infiltrated with the above resin mixture, and then cured according to the curing process of 80 / 1h+120 / 2h+150 / 2h to obtain an epoxy resin / carbon fiber composite material with a fiber content of 61%. At the same time, a blank comparison sample was prepared, and the results showed that the impact strength of the modified composite material increased...

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Abstract

The invention relates to a method for improving impact strength of an epoxy resin / carbon fiber composite material. An epoxy resin matrix is modified with four-functionality organosilicon epoxy resin N,N,N',N'-tetraglycidyl-1,3-diaminopropyl-1,1,3,3-tetramethyldisiloxane, the impact resistance of the epoxy resin / carbon fiber composite material is effectively improved, both the compatibility and the impact strength of the material are considered, the preparation method is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the field of carbon fiber composite materials, relates to the improvement technology of resin base / carbon fiber composite materials, and particularly relates to a method for improving the impact strength of composite materials by reintroducing multifunctional silicone epoxy resin into epoxy resin. Background technique [0002] Epoxy resin / carbon fiber composite materials are widely used in aerospace, automobiles, electronics, sporting goods and medical equipment due to their high specific strength, high specific modulus, high temperature resistance, corrosion resistance and many other excellent properties. The performance of epoxy resin / carbon fiber composites is determined by the fiber body, the resin matrix and the bonding strength between the two. As we all know, after curing epoxy resin, a three-dimensional insoluble and infusible network structure is obtained. This structure is characterized by brittleness. When microcrack...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08K7/06C08J5/06C08G59/38C08G59/50
Inventor 徐蕤熊建民洪丽陈大华秦玉林
Owner WUHU LION AUTOMOTIVE TECH CO LTD