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Method for preparing aqueous graphene/epoxy resin nanocomposite material

A nano-composite material and epoxy resin technology, which is applied in the field of preparation of water-based graphene/epoxy resin nano-composite materials, can solve the problem that it is difficult to form chemical bonds and affect the stress transfer and dispersion of epoxy resin nano-composite materials and matrix. , the poor wettability of graphene and epoxy resin, etc., to achieve the effects of excellent interfacial compatibility and binding force, easy mass preparation and synthesis, and simple and controllable operation process.

Active Publication Date: 2014-12-24
QINGDAO REALEADER ADVANCED MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Graphene is currently the thinnest and hardest nanomaterial in the world, and its electron mobility exceeds 15,000 cm at room temperature. 2 / s, which is higher than that of carbon nanotubes or silicon crystals, and the resistivity is only about 10 -6 Ω.cm, which is lower than copper, and is one of the materials with the lowest resistivity in the world; however, the surface of graphene is inert, the surface energy is low, and the functional groups with chemical activity are few, resulting in poor wettability between graphene and epoxy resin , and it is also difficult to form a chemical bond between the two, which directly affects the stress transfer and dispersion between the epoxy resin nanocomposite and the matrix, and the high performance of graphene cannot be fully utilized; how to effectively realize graphene and water-based environment The compounding of epoxy resin, to improve the binding force, corrosion resistance and impact resistance of epoxy resin and matrix, has become a big problem to be solved by the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Dissolve graphite in a mixed solution of concentrated sulfuric acid and concentrated phosphoric acid, add potassium permanganate and react at 40 °C for 10 hours, then add ice water twice the volume of the mixed acid; stir evenly and cool to room temperature, then add graphite mass 3 times hydrogen peroxide solution reduction, after the reaction is completed, after washing and drying, graphene oxide is obtained;

[0019] (2) Take 2.4g of graphene oxide and polyvinylpyrrolidone according to the mass ratio of 5:1, then add 4.5g of aseptic acid, mix well, and obtain functionalized graphene after the reaction is completed;

[0020] (3) Disperse functionalized graphene in water to obtain 10ml of graphene aqueous dispersion with a concentration of 0.008g / ml;

[0021] (4) Add 0.59 g of epoxy resin to the above-mentioned graphene aqueous dispersion, stir at room temperature for 40 minutes, and then distill under reduced pressure under a vacuum of 0.1 MPa to remove water in t...

Embodiment 2

[0024] Example 2 (1) Dissolve graphite in a mixed solution of concentrated sulfuric acid and concentrated phosphoric acid, add potassium permanganate and heat at 40 °C

[0025] React for 10 hours, then add ice water twice the volume of mixed acid. Stir evenly and cool to room temperature, then add hydrogen peroxide solution 3 times the mass of graphite for reduction, after the reaction is completed, wash and dry to obtain graphene oxide; (2) Take graphene oxide and polyvinylpyrrolidone according to the mass ratio of 1:3 1g in total, add 1.5g of aseptic acid, mix well, and obtain functionalized graphene after the reaction is completed; (3) Disperse the functionalized graphene in water to obtain 50ml of graphene aqueous dispersion with a concentration of 0.006g / ml;

[0026] (4) Add 3.4g of epoxy resin to the above-mentioned graphene aqueous dispersion, stir at room temperature for 50min, and then distill under reduced pressure under a vacuum of 0.1MPa to remove the water in the ...

Embodiment 3

[0030] (1) Dissolve graphite in a mixed solution of concentrated sulfuric acid and concentrated phosphoric acid, add potassium permanganate and react at 40°C for 10 hours, then add ice water twice the volume of the mixed acid. Stir evenly and cool to room temperature, then add a hydrogen peroxide solution 3 times the mass of graphite for reduction, after the reaction is completed, wash and dry to obtain graphene oxide;

[0031] (2) Take 1.2g of graphene oxide and polyvinylpyrrolidone according to the mass ratio of 1:5, add 1.5g of aseptic acid, mix well, and obtain functionalized graphene after the reaction is completed;

[0032] (3) Disperse the functionalized graphene in water to obtain 100ml of graphene aqueous dispersion with a concentration of 0.005g / ml;

[0033] (4) Add 7.4g of epoxy resin to the above-mentioned graphene aqueous dispersion, stir at room temperature for 70min, and then distill under reduced pressure under a vacuum of 0.3MPa to remove the water in the syst...

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Abstract

The invention discloses a method for preparing an aqueous graphene / epoxy resin nanocomposite material. The method comprises the following specific steps: carrying out functional modification and dispersion on graphene oxide obtained through a Hummers method, so as to obtain a high-concentration aqueous graphene dispersion solution; adding epoxy resin into the aqueous graphene dispersion solution, uniformly stirring, then, dewatering under the vacuum condition, adding a curing agent and mixing; carrying out high-temperature curing, thereby obtaining the graphene / epoxy resin nanocomposite material. According to the method, the operating process is simple, convenient and controllable, so that large-batch preparation and synthesis are facilitated; through obtaining the highly-stable aqueous graphene dispersion solution, graphene and epoxy resin can have excellent interface compatibility and adhesion; the matrix adhesion, corrosion resistance and impact resistance of epoxy resin are effectively improved; compared with the conventional aqueous epoxy resin materials, the aqueous graphene / epoxy resin nanocomposite material prepared by the method has the advantages that the hardness is improved by 1.5 times, and the impact resistance is improved by 12 times.

Description

technical field [0001] The invention belongs to the field of preparation of resin-based nanocomposites, in particular to a method for preparing water-based graphene / epoxy resin nanocomposites. Background technique [0002] Epoxy resin is an oligomer polymerized by molecules containing more than two epoxy groups. Due to the characteristics of high strength and low density, epoxy resin composite materials have gradually become one of the indispensable basic materials in the industrial field. However, with the strengthening of national environmental protection and labor protection of workers, the coating process of replacing organic solvents with water has become an important direction of coating development; water-based epoxy resin has the performance of solvent-based epoxy resin, and overcomes the pollution of solvent volatilization to the environment , has great application prospects in architectural coatings, anti-corrosion coatings, etc. However, the thermal stability, s...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K9/04C08K3/04
Inventor 宋肖肖孙明娟王圆圆孟良
Owner QINGDAO REALEADER ADVANCED MATERIALS TECH
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