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Modified graphene/epoxy resin composite material and preparation method thereof

A technology of epoxy resin and composite materials, which is applied in the field of modified graphene/epoxy resin composite materials and its preparation, can solve problems such as poor dispersion, easy agglomeration, and poor resin compatibility, and achieve improved interfacial bonding performance and improved Reaction temperature, the effect of increasing the reaction rate

Active Publication Date: 2011-08-17
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, research in this area mainly focuses on improving the electromagnetic properties of composite materials, and there are few studies on mechanical properties.
In addition, like most nanomaterials, graphene has the problems of poor dispersion in resin, easy agglomeration, and poor compatibility with resin, while graphene oxide prepared by graphite oxide method has strong hydrophilicity. , the combination with the resin is not ideal
Therefore, the purpose of improving mechanical properties cannot be achieved only by adding graphene or graphene oxide to the resin.

Method used

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  • Modified graphene/epoxy resin composite material and preparation method thereof
  • Modified graphene/epoxy resin composite material and preparation method thereof
  • Modified graphene/epoxy resin composite material and preparation method thereof

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preparation example Construction

[0026] The present invention proposes a kind of preparation method of modified graphene / epoxy resin composite material, specifically comprises the following steps:

[0027] Step 1: Preparation of graphite oxide:

[0028] (1) Get graphite powder (particle size is micron order), KNO 3 The powder is mixed with concentrated sulfuric acid (concentration is 75wt% ~ 98.3wt%), and the mixing ratio is to add 1.5 ~ 2g KNO to every 1.5g graphite powder 3 , 65-69ml concentrated sulfuric acid, heat the obtained mixture to 35-40°C in a water bath, and then continue to add KMnO 4 Powder, the addition ratio is 8.0-9.5g of KMnO per 1.5g of graphite 4 , stir magnetically at 100-300r / min, and react for more than 6 hours; then slowly add deionized water to the mixture, and adjust the temperature of the water bath to 60°C-70°C, react for 25-40min, and then add deionized water to it Water, the amount of deionized water added is still added in the ratio of 100-200ml and 200-400ml of deionized wat...

Embodiment 1

[0043] Step 1: Preparation of graphite oxide

[0044] (1) Get graphite powder (micron grade), KNO 3 Powder, concentrated sulfuric acid (concentration is 98.3wt%) mix, add 1.5g KNO in the mixing ratio 1.5g graphite powder 3 , 69ml of concentrated sulfuric acid, when the resulting mixture was heated to 40°C in a water bath, 9g of KMnO was added 4 powder, magnetic stirring reaction for more than 6 hours; then slowly add 120ml of deionized water to the mixture, and adjust the temperature of the water bath to 60°C, after 30 minutes of reaction, add 300ml of deionized water to it, continue the reaction for 5 minutes, and add to the mixed liquid Dropping concentration is 30% H 2 o 2 , until the mixed liquid turns bright yellow;

[0045] (2). The mixed liquid was washed with deionized water until it was neutral, and dried under a vacuum condition of 0.1 MPa and 80° C. to obtain graphite oxide solid.

[0046] Step 2: Preparation of Graphene Oxide

[0047] Put 0.08g of graphite ox...

Embodiment 2

[0052] Change the amount of 2,4-toluene diisocyanate (TDI) added in step 3 in embodiment 1 to 0.0016mol, and other steps are exactly the same as in embodiment 1, and the prepared modified graphene / epoxy resin composite material Refer to the standard GBT1843-2008 casting body notch impact test, the impact strength is 3.75KJ / m 2 . The scanning electron microscope photos of the fracture of the impact sample are as follows: Figure 5 , its surface morphology is river-like, and the branches of the river are dense and will merge, so the dense, complex and irregular river morphology in the figure is finally formed.

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Abstract

The invention provides a modified graphene / epoxy resin composite material and a preparation method thereof. The modified graphene / epoxy resin composite material has a two-phase structure, wherein an epoxy resin substrate serves as a main body, and black modified graphene serves as a wild phase. A preparation process comprises the following steps of: preparing graphite oxide; preparing graphene oxide; and preparing a modified graphene / epoxy resin composite material. The modified graphene / epoxy resin composite material has higher toughness compared with epoxy resin and a graphene / epoxy resin composite material, the interface bonding performance between graphene and epoxy resin is greatly enhanced, and the utilization of the performance of graphene is facilitated. By adopting the preparationmethod of the modified graphene / epoxy resin composite material, provided by the invention, the reaction temperature for the preparation of graphite oxide serving as an intermediate product is raised,thus the reaction speed is increased.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocomposite materials, in particular to a modified graphene / epoxy resin composite material and a preparation method thereof. Background technique [0002] Graphene is made of carbon atoms with sp 2 It is composed of monoatomic layers connected by hybridization, and its basic structural unit is the most stable benzene six-membered ring in organic materials. Its theoretical thickness is only 0.35nm, which is the thinnest two-dimensional material discovered so far. The discovered two-dimensional allotrope of carbon. This special structure contains rich and peculiar physical phenomena, which make graphene exhibit many excellent physical and chemical properties. For example, the strength of graphene is the highest among the tested materials, reaching 130GPa, which is more than 100 times that of steel; Flow rate up to 1.5×10 4 cm 2 ·V -1 ·s -1 , which is twice that of the currently known ...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K9/04C08K3/04C08G59/50
Inventor 肇研鲍天骄郑浩段跃新王琰
Owner BEIHANG UNIV
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