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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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 betwee...

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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.

Technology Topic

Graphite oxideFirming agent +5

Examples

Experimental program(3)

Example Embodiment

[0017] Example 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 the system;

[0022] (5) After adding 0.24g of low-molecular-weight polyamide into the system, a mixture was obtained;

[0023] (6) Cast the mixture into a mold with a preheating temperature of 60°C, put it into an oven for curing, cure at 60°C for 8 hours, then raise the temperature to 130°C, and cure for 10 hours; water-based graphene/epoxy resin nanocomposites are obtained.

Example Embodiment

[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 system;

[0027] (5) After adding 1.7g of low-molecular-weight polyamide into the system, a mixture was obtained;

[0028] (6) Cast the mixture into a mold with a preheating temperature of 60°C, put it into an oven for curing, cure at 60°C for 10 hours, then raise the temperature to 110°C, and cure for 12 hours; water-based graphene/epoxy resin nanocomposites are obtained.

Example Embodiment

[0029] Example 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 system;

[0034] (5) After adding 3g of low-molecular-weight polyamide into the system, a mixture is obtained;

[0035] (6) Cast the mixture into a mold with a preheating temperature of 80°C, put it into an oven for curing, and cure at 80°C for 10 hours, then raise the temperature to 130°C, and cure for 15 hours; water-based graphene/epoxy resin nanocomposites are obtained.

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Method for preparing aqueous graphene/epoxy resin nanocomposite material

AI-Extracted Technical Summary

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Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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