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Dispersion grinding aid for graphene and preparation method thereof

A grinding aid and graphene technology, applied in chemical instruments and methods, other chemical processes, inorganic chemistry, etc., can solve the problems that affect the popularization and application of graphene slurry, high production costs, and high strength of expanded graphite sheets. Achieve the effects of improving sanding efficiency, reducing difficulty and improving rheology

Pending Publication Date: 2019-04-19
江苏杉元科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical difficulty is that the expanded graphite sheet has high strength and is not easy to be broken and peeled off. In order to achieve the required particle size and sheet thickness, it takes a long time to peel and grind and requires high equipment, which will lead to high production costs. Popularization and Application of Graphene Slurry

Method used

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  • Dispersion grinding aid for graphene and preparation method thereof
  • Dispersion grinding aid for graphene and preparation method thereof
  • Dispersion grinding aid for graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 50g of carbon black Super P Li to 950g of NMP, pre-disperse with a dispersing disc at 1500rpm for 15min, and pass through an 80-mesh stainless steel sieve to obtain a carbon black dispersion. Then carbon black dispersion is added in high-pressure homogenizer, homogenization pressure 120MPa, homogenization 1 time, obtains dispersion grinding aid 1; Carbon black dispersion is put into high-pressure homogenizer, homogenization pressure is 100MPa, homogenization 1 time to obtain dispersing grinding aid 2; put the carbon black dispersion into a high-pressure homogenizer with a homogenizing pressure of 80 MPa, and homogenize 1 time to obtain dispersing grinding aid 3. The carbon black dispersion and the obtained 3 dispersing grinding aids were used to test the particle size with a laser particle size analyzer, and the results are shown in figure 1 and Table 1.

Embodiment 2

[0043] The 16g dispersing grinding aid 1 (according to solid content calculation) that obtains among the embodiment 1, 384g expansion rate are 400 times expanded graphite, 7280g solvent NMP carry out dispersion mixing 1 hour with high-speed disperser 2500RPM, obtain premix; Then put the premix into the sand mill and carry out the sand mill liquid phase peeling, the sand mill line speed is 12m / s, the diameter of the zirconium beads of the sand mill is 1 mm, and the sand mill time is 5 hours to obtain a compound containing dispersion grinding aid. agent graphene slurry. Detect the particle size and viscosity of the intermediate state material after sanding for 2 hours. Carry out viscosity test, particle size test and plate resistivity test to the obtained graphene slurry, the results are shown in Table 2; washing and freeze-drying test SEM, the results are shown in figure 2 .

Embodiment 3

[0045] The used dispersing grinding aid in embodiment 2 is changed into dispersing grinding aid 2, and other conditions are unchanged.

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Abstract

The invention provides a dispersion grinding aid for graphene and a preparation method thereof. The prepared dispersion grinding aid includes carbon black particles; the carbon black particles are fragnents of a carbon black primary structure; and the particle sizes D50 of the carbon black particles are less than 300 nm. The carbon black particles can be taken as the dispersion grinding aid for graphene, so that sand milling efficiency can be enhanced; and the carbon black particles can be used as a physical barrier dispersant of expandable graphite and graphene, so that graphene sheets can beprevented from stacking back.

Description

technical field [0001] The invention belongs to the field of graphene dispersion aids, in particular to a dispersion grinding aid for graphene and a preparation method thereof. Background technique [0002] Graphene is a thin-layer two-dimensional nanomaterial with high specific surface area, high surface energy, strong van der Waals force and large π bond conjugation between sheets, and it is easy to agglomerate and fold back. When preparing graphene by the liquid phase exfoliation method, in order to prevent the irreversible folding back of the exfoliated graphene, it is generally necessary to add a dispersant to prevent agglomeration and folding back. [0003] The dispersants usually added in the industry are organic surfactants or organic polymers. In a sense, this type of organic dispersant is an impurity that will affect the performance of graphene, especially the electrical conductivity. For example: (1) Surfactants, such as: conventional dispersants polyvinyl alcoho...

Claims

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Application Information

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IPC IPC(8): C09K3/14C01B32/194
CPCC09K3/1409C01B32/194C01B32/19Y02E60/10
Inventor 刘刚桥黄书宇孙培育
Owner 江苏杉元科技有限公司
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