Preparation method of high-quality graphene dispersion liquid
A graphene dispersion liquid, high-quality technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of easy agglomeration and floating, low saturated concentration of graphene dispersion, unfavorable industrial production, etc., and achieve simple preparation process , high storage stability, good monodispersity
Pending Publication Date: 2022-06-28
深圳材启新材料有限公司
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Problems solved by technology
At present, the commonly used method in industry is the way of adding surfactant. Although graphene can have a certain dispersion effect in a short period of time, the graphene dispersion cannot be stable for a long time, and the saturated concentration of graphene is not high. high
For example, China Invention Patent Application No. 202010156720.2 discloses a graphene dispersion and its preparation method and an anti-corrosion coating using the graphene dispersion. The preparation method uses graphene as a raw material and a nonionic surfactant as a dispersant , an organic solvent is used as a solvent, but the graphene dispersion prepared by this method cannot be stable for a long time, and the saturated concentration of graphene is not high, which is very unfavorable for the implementation of industrial production
[0005] The inventor further found in the research that, especially with few-layer or single-layer high-quality graphene as raw material, the graphene dispersion liquid prepared by the prior art is more unstable, easy to agglomerate and float, and the graphene in the dispersion liquid The saturated dispersion concentration is also lower
Method used
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Embodiment 1
[0029] Add 20mg high-quality graphene powder and 5mg carboxymethyl chitosan to the reactor, then add 32mL N-methylpyrrolidone and 8mL water, and then ultrasonically treat the mixture at 25°C for 2 hours to obtain high-quality graphene dispersion liquid.
Embodiment 2
[0031] First, add 5mg carboxymethyl chitosan in the reactor, then add 32mL N-methylpyrrolidone and 8mL water, slowly add high-quality graphene powder under the action of 25 ° C of ultrasonic waves, add when high-quality graphene is saturated The amount of high-quality graphene powder is 404 mg, and the saturated dispersion concentration of high-quality graphene is 10.1 mg / mL.
Embodiment 3
[0033] 25mg of high-quality graphene powder, 6.1mg of quaternary ammonium salt chitosan were added to the reactor, then 35mL of N-methylformamide and 12mL of water were added, and then the mixture was sonicated and stirred at 40 ° C for 1.5 hours to obtain high-quality Graphene dispersion.
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The invention relates to the technical field of preparation of graphene dispersion liquid, and particularly discloses a preparation method of high-quality graphene dispersion liquid. The preparation method of the high-quality graphene dispersion liquid comprises the following steps: adding high-quality graphene powder into a system consisting of a dispersing agent and a mixed solvent, and uniformly dispersing to obtain the high-quality graphene dispersion liquid. The method is simple in preparation process, safe, environmentally friendly and low in preparation cost, the high-quality graphene dispersion liquid good in monodispersity, good in conductivity and high in storage stability can be prepared, and the industrial production requirement can be met.
Description
technical field [0001] The invention relates to the technical field of graphene dispersion liquid preparation, in particular to a high-quality graphene dispersion liquid [0002] preparation method. Background technique [0003] Graphene is a new type of two-dimensional material with a honeycomb lattice structure, which is composed of carbon atoms in the form of SP. 2 Hybridized to form chemical bonds. Each carbon atom in the inner carbon atom of graphene and the surrounding three carbon atoms are separated by SP 2 The hybridization method forms chemical bonds, and there is also an unbonded electron located on the Pz orbital. The Pz orbital adjacent to the carbon atom can form a large delocalized π bond in the vertical direction, so it has excellent electrical and optical properties. Graphene has a large theoretical specific surface area (2630m 2 g -1 ), high carrier mobility (2 × 10 5 cm 2 v -1 s -1 ), high Young's modulus (~1.0TPa), high thermal conductivity (~500...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C01B32/194
CPCC01B32/194C01B2204/04C01B2204/28
Inventor 黎剑辉
Owner 深圳材启新材料有限公司