Graphene dispersant and its application

A technology of graphene and dispersion, which is applied in the treatment of dyed polymer organic compounds, fibrous fillers, transportation and packaging, etc. It can solve the problem of inconspicuous, non-universal, chemical composition and physical morphology changes of graphene materials and other issues, to achieve the effects of low cost, large-scale implementation, and simple operation

Active Publication Date: 2018-05-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Experimental program
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preparation example Construction

[0058] 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.

[0059] 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.

[0060] More preferably, the dispersion contains graphene at a concentration of 1 mg / ml-10 mg / ml.

[0061] In the graphene dispersion method, the mol...

Embodiment 1

[0078] Example 1 polyethylene glycol grafted aniline tetramer and its use in the dispersion of graphene

[0079] Polyethylene glycol monomethyl ether (molecular weight 2000, 6g) was dissolved in 50ml of DMF, then added toluene isocyanate of the same molar mass, reacted for 1 hour at 60 degrees, added 1.01g of aniline tetramer, and continued to react for 2 hours, using 500ml ether precipitation obtains 3.1g aniline tetramer graft polyethylene glycol (structural formula such as figure 1 shown). Weigh polyethylene glycol grafted aniline tetramer and graphene slurry (graphene content 4.5%) of equal weight to configure aqueous solutions of different concentrations, and ultrasonically disperse for 1 hour. The graphene dispersion effect is as shown in table 1. A stable dispersion can be formed when the olefin concentration is below 3 mg / ml.

[0080] Table 1. Effect of aniline tetramer grafted with polyethylene glycol to disperse graphene in water

[0081] 5mg / 10ml

Embodiment 2

[0082] Embodiment 2 aniline trimer polycaprolactone copolymer and its dispersion for graphene

[0083] Add 1.16g of aniline trimer and 50ml of dry toluene to a 100ml single-necked flask, then add 9.2g of caprolactone, and 200mg of stannous octoate, react at 120 degrees for 3 hours under a nitrogen atmosphere, and precipitate with 200ml of ethanol to obtain 8.2g Aniline trimer grafted polycaprolactone (structural formula such as figure 2 shown). Take the aniline trimer polycaprolactone copolymer of equal weight and graphene slurry (graphene content 4.5%) to configure the aqueous solution of different concentration, ultrasonic dispersion 1 hour, graphene dispersion effect is as shown in table 2, in graphite A stable dispersion can be formed when the olefin concentration is below 3 mg / ml.

[0084] Table 2. Aniline trimer polycaprolactone copolymer and its dispersion effect for graphene

[0085] 5mg / 10ml

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Abstract

The invention discloses a graphene dispersant, which comprises an electroactive polymer containing aniline oligomer units, and the electroactive polymer can form a π-π complex with graphene. The invention also discloses the application of the graphene dispersant, for example, provides a dispersion method, dispersion and the like based on the graphene dispersant. The present invention utilizes the conductive aniline oligomer derivatives which are easy to synthesize and low in cost as the graphene dispersant, and by simply mixing the dispersant with graphene or other nano-carbon materials in the dispersion medium, the nanometer carbon can be greatly improved. The dispersion degree, dispersion stability and redispersion performance of carbon materials in the dispersion medium will not damage the physical and chemical properties of these carbon materials, and the operation is simple, which is conducive to 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): B01F17/16B01F17/52C09C1/46C09C3/10C09K23/16C09K23/52
CPCC09C1/46C09C3/10C09K23/16
Inventor 余海斌赵海超顾林刘栓马骏丁纪恒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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