Graphene paste material and preparation method thereof

A graphene and slurry technology, applied in the field of obtained graphene slurry materials, can solve the problems of reduced graphene performance, low graphene yield, usage restrictions, etc., and achieves uniform and stable quality, high yield, and damage prevention. Effect

Inactive Publication Date: 2016-11-23
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing wet grinding and stirring is to grind the next batch of materials after one batch of materials is ground, that is, intermittent grinding, which cannot carry out continuous production, the number of product layers varies greatly, and the energy consumption of the process is high.
Moreover, the yield of graphene is low and the quality is unstable
[0006] Since graphene is in a state of coexistence of various sizes of particles during the exfoliation process, graphene is at the nanometer level, a

Method used

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  • Graphene paste material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Mix the dense crystalline graphite powder passed through a 100-mesh sieve with the dispersant sodium pyrophosphate and the chelating agent ethylenediaminetetraacetic acid at a mass ratio of 100:1:2, and then process the material into micron-sized particles through a jet mill , and disperse the graphite powder during the crushing process;

[0035] (2) Take the material obtained in step (1), add solvent water and reducing agent sodium sulfite and mix evenly. The amount of solvent added is to ensure that the viscosity of the mixed slurry is between 100-200 mPa·s, and the amount of reducing agent added is graphite 0.5% of the mass, and then the slurry is sent to a first-stage grinder disc mill, and the grinding time is controlled at 30min;

[0036] (3) Send the slurry ground in step (2) into the second-stage grinder. The second-stage grinder is a uniform-speed stirring grinder and a high-speed shear emulsifier. During the uniform-speed stirring process, a stable liquid ...

Embodiment 2

[0039] (1) Mix flake graphite powder passed through a 100-mesh sieve with dispersant sodium lauryl sulfate and chelating agent triethylenetetramine hexamethylenephosphonic acid at a mass ratio of 100:3:2, and then pass the material through a jet mill Processed into micron-sized particles, and disperse graphite powder during the crushing process;

[0040](2) Take the material obtained in step (1), add solvent ethanol and reducing agent thiourea dioxide and mix evenly. The amount of solvent added is to ensure that the viscosity of the mixed slurry is between 100-200 mPa·s. The amount of reducing agent added is 1% of the mass of graphite, and then the slurry is sent to a grinding machine star-type ball mill, and the grinding time is controlled at 45min;

[0041] (3) Send the slurry ground in step (2) into the second-stage grinder. The second-stage grinder is a constant-speed stirring grinder, that is, a vertical stirring mill. During the uniform-speed stirring process, a stable l...

Embodiment 3

[0044] (1) Mix the expanded graphite powder passed through a 100 mesh sieve with the dispersant polyvinylpyrrolidone and the chelating agent citric acid at a mass ratio of 100:3:5, and then process the material into micron-sized particles through a jet mill, and in the pulverization process disperse the graphite powder;

[0045] (2) Take the material obtained in step (1), add the solvent N-methylpyrrolidone, and the reducing agent hydrazine hydrate and mix evenly. The amount of solvent added is to ensure that the viscosity of the mixed slurry is between 100-200 mPa·s. The addition amount of graphite is 2% of graphite mass, then the slurry is sent into a colloid mill of a grinder, and the grinding time is controlled at 60min;

[0046] (3) Send the slurry ground in step (2) into the second-stage grinder. The second-stage grinder is a constant-speed stirring grinder. During the uniform-speed stirring process, a stable liquid surface is formed, and the flow line of the stirring is...

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Abstract

The invention provides a graphene paste material, and belongs to the field of graphene preparation. Through the collection and enrichment effect of a chelating agent, through two-stage grinding under a liquid grinding condition, particles reaching the graphene level float on the liquid surface through the chelating agent and are continuously guided out and collected through a diversion groove, so the graphene level can not be reached; the chelating agent can not be chelated and collected, so the chelating agent continues to circulate for grinding in a grinding device. By means of a method, particles reaching the graphene level are collected in time, yield is high, graphene is effectively prevented from being excessively ground and damaged, and collected graphene is uniform and stable in quality. Graphene is in a chelating state, is stable in dispersion and free of sedimentation and coagulation in paste and is graphene paste which can be directly added. The material is applied to a battery conductive agent, conductive coating, anticorrosion coating and thermal conductive coating. The green, clean and large-scale production, application and development of the graphene industry are further promoted.

Description

technical field [0001] The invention relates to the field of graphene material preparation, in particular to the preparation of graphene material through liquid continuous grinding and exfoliation, and further relates to the obtained graphene slurry material. Background technique [0002] In 2004, two scientists from the University of Manchester in the United Kingdom discovered graphene using the method of micromechanical exfoliation, and won the Nobel Prize in Physics in 2010. As a new material, graphene is currently widely studied. Graphene in an ideal state is a flat plate structure with a single atom thickness and sp2 bonded carbon atoms. However, due to its nano-microscopic characteristics, the preparation, storage, and use of graphene need to be solved in depth. [0003] At present, the most mature method is to prepare graphene by redox method. Using strong oxidants such as concentrated sulfuric acid, concentrated nitric acid, and potassium permanganate to oxidize g...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B2204/28
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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