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Interface bonding-enhanced aramid fiber composite material preparation method

An aramid fiber composite material and interfacial bonding technology, applied in the field of composite material preparation, can solve problems such as poor interfacial bonding performance, and achieve the advantages of reducing crosslinking density, improving interlayer shear performance, and improving interfacial bonding performance. Effect

Inactive Publication Date: 2018-02-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect of poor interfacial bonding performance of aramid fiber composite materials, and obtain a modified epoxy resin with synchronously improved bonding performance and toughness through the modification of epoxy resin by isocyanate, which can be used in pre- In the impregnation resin system, the processing window of the prepreg is widened, the toughness matching and interfacial compatibility between the resin matrix of the composite material and the fiber are improved, and the interlayer shear strength of the aramid fiber composite material is significantly improved.

Method used

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  • Interface bonding-enhanced aramid fiber composite material preparation method
  • Interface bonding-enhanced aramid fiber composite material preparation method
  • Interface bonding-enhanced aramid fiber composite material preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The diphenylmethane diisocyanate and bisphenol A epoxy resin are according to the NCO:epoxy molar ratio of 1:2, add the catalyst 2-methylimidazole, and react at 200 ° C for 2 hours to obtain a modified epoxy resin, relative to 100 1 part modified epoxy resin, the massfraction of catalyst is 0.02 part; In above-mentioned modified epoxy resin, add trifunctionality glycidyl amine epoxy resin and dicyandiamide and 3-phenyl-1,1-dimethyl The urea curing system is kneaded to obtain a prepreg epoxy resin system, wherein the total amount of trifunctional glycidylamine epoxy resin and modified epoxy resin is 100 parts, and the trifunctional glycidylamine epoxy resin is 30 parts. Dicyandiamide is 8 parts, 3-phenyl-1,1-dimethylurea is 1 part; the obtained resin system is coated with a film machine, and compounded with aramid fiber prepreg through a compound machine to obtain aramid fiber For fiber prepreg, place the cut prepreg in a mold, and obtain a composite sheet at 130°C for 2...

Embodiment 2

[0026] Toluene diisocyanate and bisphenol F epoxy resin are NCO:epoxy molar ratio of 1:5, add catalyst N,N-dimethylbenylamine, and react at 150°C for 6 hours to obtain modified epoxy resin. 100 parts of modified epoxy resin, the mass fraction of the catalyst is 0.5 part; add bisphenol A glycidyl ether to the above modified epoxy resin and knead with dicyandiamide and diaminodiphenylmethane curing system to obtain a prepreg ring Oxygen resin system, wherein the total amount of bisphenol A glycidyl ether and modified epoxy resin is 100 parts, bisphenol A glycidyl ether is 60 parts, dicyandiamide is 10 parts, and diaminodiphenylmethane is 10 parts Parts; the obtained resin system is coated with a film machine, and compounded with aramid fiber prepreg through a compound machine to obtain aramid fiber prepreg, and the cut prepreg is placed in a mold, and the composite Material sheet.

[0027] The monitoring of the reaction end point of modified epoxy in the present invention is as...

Embodiment 3

[0029] Hexamethylene diisocyanate and novolak type epoxy resin according to NCO:epoxy molar ratio of 1:2.5, add catalyst 2-ethyl-4-methylimidazole, react at 170°C for 3h, and obtain modified epoxy resin , relative to 100 parts of modified epoxy resin, the mass fraction of the catalyst is 0.3 parts; add liquid novolac epoxy resin, dicyandiamide and imidazole curing agent to the above modified epoxy resin and knead to obtain a prepreg epoxy resin system , where the total amount of liquid novolak epoxy resin and modified epoxy resin is 100 parts, liquid novolac epoxy resin is 50 parts, dicyandiamide is 10 parts, and imidazole is 2 parts; The machine-coated film is compounded with aramid fiber prepreg through a compound machine to obtain aramid fiber prepreg, and the cut prepreg is placed in a mold, and the composite material sheet is obtained at 130°C for 2h.

[0030] The monitoring of the reaction end point of modified epoxy in the present invention is as follows: adopt the char...

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Abstract

The invention discloses an interface bonding-enhanced aramid fiber composite material preparation method. The method is characterized in that isocyanate and epoxy resin are used for preparing modifiedepoxy resin having a molecule main chain containing a five-membered ring structure according to controllable proportion and technical reaction; liquid epoxy resin and a curing agent are added for kneading to obtain a pre-dip material resin system with synchronously increased bonding property and toughness; a resin glue membrane is prepared, then is composited with aramid fiber or fabric to obtaina pre-dip material, and finally moulding preparation is carried out to obtain the interface bonding-enhanced aramid fiber composite material. The toughness of the modified epoxy resin system is increased, the bonding property of a resin matrix and aramid fiber are enhanced, the technical performance of the pre-dip material is good, a processing moulding window is wide, the interlayer shearing intensity of the composite material is obviously increased, and the modified epoxy resin system can be used for the composite material having the aramid fiber structure.

Description

Technical field: [0001] The invention belongs to the field of preparation of composite materials, and in particular relates to a preparation method of an aramid fiber composite material with enhanced interfacial bonding. Background technique: [0002] Aramid fiber composite materials have the advantages of high specific strength, specific modulus, chemical stability and designability, and are known as one of the three high-performance materials. However, aramid fibers have a smooth surface, high chemical inertness, poor wettability with the resin matrix, and low interfacial shear strength, which have a great impact on the failure mode and macroscopic mechanical properties of composite materials. Ways to improve the interfacial properties of aramid fiber composites: first, the toughening modification of epoxy resin to match the toughness of aramid fibers, improve the load transfer between the matrix and fibers, and improve the interfacial properties of composite materials. P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24C08J5/04C08L63/00C08L63/02C08L77/10C08G59/14
CPCC08G59/1477C08J5/046C08J5/24C08J2363/00C08J2363/02C08J2463/00C08L77/10
Inventor 李刚刘利民许鹏杨小平
Owner BEIJING UNIV OF CHEM TECH
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