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Method for enhancing interfacial adhesion property of aramid fiber and epoxy resin

A technology of aramid fiber and epoxy resin, which is applied in fiber type, fiber treatment, textiles and papermaking, etc. It can solve the problems of poor bonding between aramid fiber and epoxy resin, achieve excellent performance, increase strength, and improve the interface cohesive effect

Pending Publication Date: 2020-11-24
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of poor bonding between aramid fiber and epoxy resin, the present invention provides a method for improving the interface bonding between aramid fiber and epoxy resin

Method used

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  • Method for enhancing interfacial adhesion property of aramid fiber and epoxy resin
  • Method for enhancing interfacial adhesion property of aramid fiber and epoxy resin
  • Method for enhancing interfacial adhesion property of aramid fiber and epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Fiber modification treatment

[0021] Soak the aramid fiber in acetone solution for 2 hours, wash it repeatedly with deionized water, dry it in a drying oven at 60°C for 2 hours, and seal it for later use. Prepare a 2g / L dopamine hydrochloride solution, adjust the pH of the solution to 8.5 with TRIS buffer, add hydroxyl carbon nanotubes with a mass fraction of 0.03%, and after mixing fully, put the aramid fiber into the dopamine mixed solution and soak for 4h. Then add silane coupling agent KH560 with a mass fraction of 1%, soak and react for 20 hours, finally wash with deionized water for 3-5 times, and dry in an oven at 60°C for 2 hours.

[0022] (2) Fiber surface contact angle test

[0023] Sigma 700 / 701 surface tensiometer was used to test the contact angle and free energy of fiber surface. Five samples were taken in each group, and the average value was taken.

[0024] (3) Pull-out experiment of fibers in resin

[0025] Prepare the resin according to the ra...

Embodiment 2

[0029] (1) Fiber modification treatment

[0030] Soak the aramid fiber in acetone solution for 2 hours, wash it repeatedly with deionized water, dry it in a drying oven at 60°C for 2 hours, and seal it for later use. Prepare a 2g / L dopamine hydrochloride solution, adjust the pH of the solution to 8.5 with TRIS buffer, add hydroxyl carbon nanotubes with a mass fraction of 0.03%, and after mixing fully, put the aramid fiber into the dopamine mixed solution and soak for 4h. Then add silane coupling agent KH560 with a mass fraction of 1.5%, soak and react for 20 hours, and finally wash with deionized water for 3-5 times, and dry in an oven at 60°C for 2 hours.

[0031] (3) Fiber surface contact angle test

[0032] Sigma 700 / 701 surface tensiometer was used to test the contact angle and free energy of fiber surface. Five samples were taken in each group, and the average value was taken.

[0033] (3) Pull-out experiment of fibers in resin

[0034] Prepare the resin according to ...

Embodiment 3

[0038] (1) Fiber modification treatment

[0039] Soak the aramid fiber in acetone solution for 2 hours, wash it repeatedly with deionized water, dry it in a drying oven at 60°C for 2 hours, and seal it for later use. Prepare a 2g / L dopamine hydrochloride solution, adjust the pH of the solution to 8.5 with TRIS buffer, add hydroxyl carbon nanotubes with a mass fraction of 0.03%, and after mixing fully, put the aramid fiber into the dopamine mixed solution and soak for 4h. Then add silane coupling agent KH560 with a mass fraction of 2%, soak for 20 hours, wash with deionized water for 3-5 times, and dry in an oven at 60°C for 2 hours.

[0040] (4) Fiber surface contact angle test

[0041] Sigma 700 / 701 surface tensiometer was used to test the contact angle and free energy of fiber surface. Five samples were taken in each group, and the average value was taken.

[0042] (3) Pull-out experiment of fibers in resin

[0043] Prepare the resin according to the ratio of epoxy resin...

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Abstract

The invention provides a method for enhancing the interfacial adhesion property of aramid fiber and epoxy resin, aiming at the problems that the surface of the aramid fiber is inert and the interfacial adhesion property between the aramid fiber and the epoxy resin is poor. The method is characterized in that the aramid fiber is modified by doping a carbon nano tube with dopamine and grafting a silane coupling agent for the second time. The concentration of the silane coupling agent is 2% and the concentration of a dopamine solution is 2g / L. The method comprises the following steps of: removingimpurities on the surface of the aramid fiber by utilizing an acetone solution and drying; and immersing the treated aramid fiber into a dopamine and hydroxyl carbon nano tube mixed solution to forma polydopamine coating on the surface; grafting the silane coupling agent KH560 for the second time. According to the modified aramid fiber prepared by the method, the strength is enhanced by 35.5%; in a drawing experiment of an epoxy resin composite material, the shearing strength of a fiber interface is improved by 41.2%. The fiber treated by the modification method effectively improves the mechanical properties of an aramid resin-based composite material and has a wide application prospect in various fields including military, building industry and the like.

Description

technical field [0001] The invention relates to a method for modifying aramid fiber to improve the interface adhesion with epoxy resin, provides a theoretical basis for subsequent research on the mechanical properties of aramid fiber composite materials, and belongs to the scientific and technical field of aramid fiber composite materials. Background technique [0002] Among the varieties of aramid fibers, para-aramid (aramid 1414) has the best comprehensive performance. The rigid macromolecular structure endows aramid with high strength, high modulus, high temperature resistance, and chemical corrosion resistance. It is often used as a composite material reinforcement. Widely used in aerospace, military, transportation, protective equipment and other fields. [0003] Due to the conjugation effect between the molecular segments of aramid fiber and the steric hindrance effect of the benzene ring, the activity of the surface groups is low, and the molecular chain is in a rigid...

Claims

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Application Information

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IPC IPC(8): D06M13/513D06M11/74D06M15/37C08J5/06C08L63/00C08L77/10D06M101/36
CPCC08J5/06C08J2363/00C08J2477/10D06M11/74D06M13/513D06M15/37D06M2101/36
Inventor 李翠玉李晓雨苏瑞
Owner TIANJIN POLYTECHNIC UNIV
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