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Graphene-toughened epoxy resin composite material and preparation method thereof

A technology of epoxy resin and composite materials, which is applied in the treatment of fibrous fillers and dyed polymer organic compounds, etc. It can solve the problems of difficult resin dispersion, easy agglomeration, poor resin compatibility, etc., and achieve the effect of avoiding harm

Inactive Publication Date: 2015-09-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong van der Waals force and π-π interaction between graphene nanosheets, it is easy to agglomerate, which makes it difficult to disperse in the resin and has poor compatibility with the resin.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Step 1: Preparation of graphene toughening agent: Dissolve 50 mg of graphene oxide in 100 mL of deionized water, ultrasonically disperse for 30 minutes, add 50 mg of dopamine, adjust the pH of the solution to 8.0, and react at 30°C for 12 hours;

[0012] The second step, the preparation of graphene toughened epoxy resin composite material: add 50mg polydopamine-modified graphene toughener to 10g bisphenol A epoxy resin, stir at 20°C for 45 minutes, add 2gDETDA and stir After 5 minutes, vacuumize and remove air bubbles, pour it into a mold for curing at 60°C for 7 hours, then raise the temperature to 120°C and cure for 10 hours to obtain an epoxy resin composite material toughened by polydopamine-modified graphene toughener.

Embodiment 2

[0014] Step 1: Preparation of graphene toughening agent: Dissolve 100mg graphene oxide in 100mL deionized water, disperse ultrasonically for 30 minutes, add 50mg dopamine, adjust the pH value of the solution to 8.5, and react at 60°C for 5 hours;

[0015] The second step, the preparation of graphene toughened epoxy resin composite material: add 100mg polydopamine-modified graphene toughener to 10g epoxy resin, stir at 30°C for 30 minutes, add 4g methyltetrahydrophthalic anhydride Stir for 2 minutes, vacuumize and remove air bubbles, pour into a mold for curing at 70°C for 5 hours, heat up to 140°C for 6 hours, and obtain an epoxy resin composite material toughened by polydopamine-modified graphene toughener.

Embodiment 3

[0017] Step 1: Preparation of graphene toughening agent: Dissolve 250mg graphene oxide in 100mL deionized water, disperse ultrasonically for 100 minutes, add 350mg dopamine, adjust the pH of the solution to 9.0, and react at 50°C for 8 hours;

[0018] The second step, the preparation of graphene toughened epoxy resin composite material: add 250mg polydopamine-modified graphene toughener to 10g epoxy resin, stir at 30°C for 30 minutes, add 3g methylhexahydrophthalic anhydride Stir for 3 minutes, vacuumize and remove air bubbles, pour into a mold for 4.5 hours at 75°C and cure for 4.5 hours, then raise the temperature to 150°C and cure for 5 hours to obtain an epoxy resin composite material toughened by polydopamine-modified graphene toughener.

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Abstract

The invention provides a graphene-toughened epoxy resin composite material and a preparation method thereof. The provided material is prepared by the following steps: taking epoxy resin as the base material, then adding a graphene toughening agent and a curing agent, and finally heating and curing to obtain the graphene-toughened epoxy resin composite material. The graphene toughening agent is polydopamine modified graphene, polydopamine can well adhere on the graphene surface, the molecular chain of polydopamine comprises a great amount of hydroxy groups and amino groups, thus the interface binding performance between graphene and epoxy resin is enhanced, and the dispersion of the graphene toughening agent in epoxy resin is promoted. The weight ratio of epoxy resin, curing agent, and graphene toughening agent is 100:(15-50):(0.1-8). The preparation method has the advantages that no toxic solvent is used during the preparation process, thus the harm to human and environment is avoided; the raw materials are cheap and easily available; the operation is convenient, and massive production can be easily achieved. Compared with the epoxy resin, the toughness of the prepared epoxy resin composite material is greatly improved, and moreover, due to the excellent thermal conductivity of graphene, the conductivity of epoxy resin is improved.

Description

technical field [0001] The invention relates to the field of preparation of resin-based nanocomposite materials, in particular to a method for preparing graphene / epoxy resin composite materials. Background technique [0002] Epoxy resin is a thermosetting resin with excellent comprehensive properties. It has the advantages of excellent adhesion, corrosion resistance, and high stability. It is widely used in coatings, electronic components, machinery, and adhesives. However, epoxy resin is very brittle, and its fracture flexibility and impact resistance are poor, which limits its application to a large extent. Therefore, toughening epoxy resin has always been one of the important research topics at home and abroad. [0003] Graphene has been a research hotspot all over the world since it was successfully prepared in 2004. The strength of graphene is currently known as the highest strength material in the world, reaching 130Gpa, more than 100 times that of steel. Combining ...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L63/02C08K9/04C08K3/04C09C1/46C09C3/10
Inventor 罗静陈宇泽朱瑞刘晓亚
Owner JIANGNAN UNIV
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