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Dispersing agent capable of properly reducing viscosity of graphene oxide slurry and application thereof

A slurry viscosity and dispersant technology, applied in the field of material preparation, can solve problems such as toxicity and environmental unfriendliness, and achieve the effects of improving performance, facilitating dispersion, and increasing solid content

Inactive Publication Date: 2019-11-22
WUXI JONES TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the solid content of the graphene oxide slurry increases, its viscosity will increase rapidly, and the increase in viscosity is not conducive to the coating of the slurry. The solid content of the graphene oxide prepared in the prior art is about 1wt%, and the dispersed The dispersants are DMF, DMSO, THF, NMP, acetone, benzoic acid, etc. These dispersants not only have certain toxicity, but also are not friendly to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A dispersant capable of moderately reducing the viscosity of graphene oxide slurry is sodium dodecylbenzenesulfonate.

[0018] The application of described dispersant in the preparation of high-solid low-viscosity graphene oxide slurry comprises the following steps:

[0019] (1) Add the weighed graphene oxide and dispersant into deionized water according to the proportion and stir until a uniform slurry is obtained. The viscosity of the slurry is controlled at 7000MPa·s. The mass fraction of each substance in the slurry is: graphene oxide 3%, dispersant 0.2%, the rest is water;

[0020] (2) Defoaming the slurry in step (1), and coating it into a slurry with a thickness of 4 mm by using a doctor blade coating method, and drying the slurry to obtain a dry graphene oxide film with a thickness of 110 μm;

[0021] (3) Put the graphene oxide film obtained in step (2) into a carbonization furnace at 1500°C for 180 minutes for pre-reduction treatment, then put it into a high-t...

Embodiment 2

[0025] A dispersant that can moderately reduce the viscosity of graphene oxide slurry, said dispersant includes sodium dodecylbenzenesulfonate, sodium p-toluenesulfonate, sodium benzenesulfonate, the mass ratio of each component is dodecane Sodium benzenesulfonate: sodium p-toluenesulfonate: sodium benzenesulfonate=2:2:1.

[0026] The application of described dispersant in the preparation of high-solid low-viscosity graphene oxide slurry comprises the following steps:

[0027] (1) Add the weighed graphene oxide and dispersant into deionized water according to the proportion and stir until a uniform slurry is obtained. The viscosity of the slurry is controlled at 8500MPa·s. The mass fraction of each substance in the slurry is: graphene oxide 3wt%, dispersant 0.2wt%, the rest is water;

[0028] (2) Defoaming the slurry in step (1), and coating it into a slurry with a thickness of 8 mm by using a doctor blade coating method, and drying the slurry to obtain a dry graphene oxide f...

Embodiment 3

[0033] A dispersant that can moderately reduce the viscosity of graphene oxide slurry, said dispersant includes sodium p-toluenesulfonate, sodium benzenesulfonate and p-hydroxybenzoic acid, the mass ratio of each component is sodium p-toluenesulfonate: benzene Sodium sulfonate: p-hydroxybenzoic acid = 1:2:2.

[0034] The application of described dispersant in the preparation of high-solid low-viscosity graphene oxide slurry comprises the following steps:

[0035] (1) Add the weighed graphene oxide and dispersant into deionized water according to the proportion and stir until a homogeneous slurry, the viscosity of the slurry is controlled at 7500MPa s, and the mass fraction of each substance in the slurry is: graphene oxide 4wt%, dispersant 0.3wt%, the rest is water;

[0036] (2) Defoaming the slurry in step (1), and coating it into a slurry with a thickness of 8 mm by using a doctor blade coating method, and drying the slurry to obtain a dry graphene oxide film with a thickne...

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Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a dispersing agent capable of properly reducing viscosity of graphene oxide slurry and application ofthe dispersing agent. Molecules of the dispersing agent contain benzene rings, anions can be formed after hydrolysis, and the dispersing agent comprises but is not limited to one or more of sodium dodecylbenzene sulfonate, sodium p-toluenesulfonate, sodium benzenesulfonate and p-hydroxybenzoic acid. The pi bond of the benzene ring in the dispersing agent can promote self-assembling of the grapheneoxide micron sheets during film formation to form a high-orientation graphene oxide film, and the performance of the heat conduction film is improved; meanwhile, anions in the dispersing agent have the effect of a surfactant, the agglomeration phenomenon of the graphene oxide micron sheets can be hindered, the solid content of graphene oxide can be increased, and the dispersing agent used in themethod is environmentally friendly, non-toxic and harmless.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a dispersant capable of moderately reducing the viscosity of graphene oxide slurry and an application thereof. Background technique [0002] Nowadays, graphite film is widely used in mobile phones and various high-power device heat dissipation applications, its thermal conductivity can be as high as 1950W / m K, and the preparation method of this high thermal conductivity and heat dissipation graphite film is mainly polyimide film sintering A large amount of tar will be produced during the sintering process of polyimide film, which is not friendly to the environment, and the cost of polyimide film is high. Although it has super high thermal conductivity, its cost performance is low, and polyimide film The thickness of the thin-film sintered graphite film does not exceed 70 μm, and its thermal conductivity decreases significantly with the increase of film th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194B01F17/00B01F17/02C09K23/00C09K23/02
CPCC01B32/194C09K23/00C09K23/018
Inventor 陈曲唐文军杨朝晖吴晓宁朱光福
Owner WUXI JONES TECH
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