Graphene dispersant and its application

A graphene and dispersion technology, applied in the direction of inorganic chemistry, non-metallic elements, carbon compounds, etc., can solve the problems of graphene material chemical composition and physical morphology changes, ineffective effects, non-universal, etc., to achieve beneficial Large-scale implementation, low cost, and the effect of improving dispersion

Active Publication Date: 2018-08-28
NINGBO ZKJH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One of the commonly used methods is to add auxiliary dispersants such as surfactants to the dispersion medium. Although it can improve the dispersion of graphene to a certain extent, the effect is not obvious, and generally speaking, specific surfactants Only applicable to specific dispersion media, not universal
Another way is to chemically modify graphene to improve its dispersion performance, but this method will lead to changes in the chemical composition and physical morphology of graphene materials.

Method used

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  • Graphene dispersant and its application
  • Graphene dispersant and its application
  • Graphene dispersant and its application

Examples

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Effect test

preparation example Construction

[0055] Another aspect of the present invention also provides a method for preparing a graphene dispersion, which includes: uniformly mixing graphene and the graphene dispersant in a dispersion medium to form a stable dispersion.

[0056] In some embodiments, a graphene dispersion method may include: only dissolving the graphene dispersant and graphene in an organic solvent, thereby forming a stable dispersion. It should be noted that the "dissolved" mentioned here is not understood by those of ordinary skill as dissolved, but should be understood as "incorporated", "dispersed into" or "mixed in", etc. For example, the graphene dispersant and graphene can be added into an organic solvent, and stirred or ultrasonically dispersed, for example, ultrasonically dispersed for more than 1 hour, so as to form a stable dispersion liquid.

[0057] More preferably, the dispersion contains graphene at a concentration of 1 mg / ml-10 mg / ml.

[0058] In the graphene dispersion method, the mol...

Embodiment 1

[0075] The synthesis of embodiment 1 aniline trimer and its use in the dispersion of graphene in oily solvent

[0076] Add 2.96g of p-phenylenediamine sulfate, 1.85g of aniline and 50mL of 1M HCl solution into a round-bottomed flask, and place it in an ice-salt bath at -5°C to form a reaction solution A. In addition, 4.5 g of ammonium persulfate was dissolved in 50 mL of HCl solution with a concentration of 1 M to form a reaction solution B, and the solution B was slowly added dropwise to the above reaction solution A at a rate of about 1 drop / second. After the addition was completed, Stirring was continued for 1 h. After the reaction, the product was poured into a Buchner funnel for suction filtration, washed with a 1M HCl solution pre-cooled to 0°C, and then washed with a large amount of deionized water to obtain a dark green solid product. The product was first washed with 10% (mass fraction) ammonia water, and then washed with a large amount of deionized water to finally ...

Embodiment 2

[0083] Embodiment 2. the synthesis of aniline tetramer and its use in graphene oily dispersion

[0084] Weigh 18.5g of aniline dimer in a round bottom flask, add 200ml of acetone and 300ml of HCl with a concentration of 1M, stir and dropwise add 45.65g of ammonium persulfate in an HCl solution with a concentration of 1M in an ice bath, and react for 3 hours Afterwards, filter, wash with 1M ammonia water and distilled water successively to obtain aniline tetramer. The obtained aniline tetramer and graphene slurry were dissolved in tetrahydrofuran in a certain proportion, ultrasonically dispersed for 1 hour, and its dispersion effect in the solution was checked. As shown in Table 3, the aniline tetramer and graphene composite were When the concentration is below 2.5mg / ml, a stable dispersion can be formed in tetrahydrofuran.

[0085] After the dispersion liquid is dried by spray drying, a graphene-dispersant compound can be obtained, and the graphene-dispersant compound is dire...

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Abstract

The invention discloses a graphene dispersant, which comprises aniline oligomer with electro-activity. The aniline oligomer can form [pi]-[pi] complex with graphene. The invention also discloses applications of the graphene dispersant, such as dispersing method and dispersion based on the graphene dispersant, and the like. Conductive aniline oligomer and / or derivatives thereof, which can be easily synthesized and have a low cost, are taken as the graphene dispersant; the dispersant and graphene or other nano carbon materials are simply mixed in a dispersion medium, the dispersion degree, dispersion stability and re-dispersion performance of nano carbon material in the dispersion medium are largely improved; moreover, the physical and chemical properties of the carbon materials are not damaged, the operation is simple, and the graphene dispersant is suitable for large scale implementation.

Description

technical field [0001] The invention relates to a graphene dispersing method, in particular to a graphene dispersant and application thereof. Background technique [0002] Graphene is a carbon material with sp2 hybridized carbon atoms interconnected to form a two-dimensional honeycomb lattice structure with a single atomic layer thickness, and has excellent electrical, mechanical, thermal and mechanical properties. The preparation methods of graphene usually include mechanical exfoliation, chemical vapor deposition, oxidation-reduction, solution ultrasonic glass and other methods. Due to the strong π-π interaction of the exfoliated graphene, the graphene sheets are easy to agglomerate together, resulting in limited solubility in organic solvents or water, which greatly limits its application. [0003] In view of this, researchers have proposed various schemes in order to solve these problems. One of the commonly used methods is to add auxiliary dispersants such as surfacta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194
Inventor 余海斌赵海超顾林刘栓马骏丁纪恒
Owner NINGBO ZKJH NEW MATERIAL
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