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High-dispersion graphene solution prepared by virtue of one-step method and preparation method of high-dispersion graphene solution

A graphene solution, high dispersion technology, applied in the direction of coating, etc., can solve the problems of poor dispersion of graphene and polymer, discount of excellent performance of graphene, application restrictions, etc., and achieve convenient method, low cost and good applicability Effect

Inactive Publication Date: 2019-03-19
NANJING FORESTRY UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Generally, graphene is stripped from graphite, the cost is high, and the dispersion of graphene and polymer is poor. Due to the interaction of Van der Waals force between the sheets, it is easy to aggregate during the application process, and usually needs to be dispersed. In solvents, but because graphene is insoluble in water and non-lipophilic, its application is limited, so the development of graphene dispersions with good dispersion and high stability will help expand the application range of graphene
Most of the existing technology is to change graphene into graphene oxide for dispersion, which greatly reduces the excellent performance of graphene; in addition, the oxidizing agent and reducing agent used in the dispersion process will also pollute the environment

Method used

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  • High-dispersion graphene solution prepared by virtue of one-step method and preparation method of high-dispersion graphene solution

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Effect test

Embodiment 1

[0039] One-step preparation of highly dispersed graphene solution is characterized in that it includes cellulose nanocrystal / graphene flake suspension; wherein, graphene flake and cellulose nanocrystal suspension in cellulose nanocrystal / graphene flake suspension The mass ratio is 1-3:100.

[0040] The modifier nanocellulose is cellulose nanocrystal / graphene flake suspension, the amount of dry matter after the two are blended ranges from 20.2-20.6g, and its preparation method is: treat with sulfuric acid with a concentration of 64% Microcrystalline cellulose Microcrystalline cellulose, proportioning microcrystalline cellulose: H 2 SO 4 =1g: 9.8ml, add a certain amount of flake graphene material and microcrystalline cellulose in proportion to mix with concentrated sulfuric acid, the acid hydrolysis temperature is 45 ℃, the time is 60min-120min; add deionized water to stop the acid hydrolysis reaction, then Centrifugal washing is carried out at a centrifugal speed of 4000 rpm ...

Embodiment 2

[0047] One-step preparation of highly dispersed graphene solution is characterized in that it includes cellulose nanocrystal / graphene flake suspension; wherein, graphene flake and cellulose nanocrystal suspension in cellulose nanocrystal / graphene flake suspension The mass ratio is 1-3:100.

[0048] The modifier nanocellulose is cellulose nanocrystal / graphene flake suspension, the amount of dry matter after the two are blended ranges from 20.2-20.6g, and its preparation method is: treat with sulfuric acid with a concentration of 64% Microcrystalline cellulose Microcrystalline cellulose, proportioning microcrystalline cellulose: H 2 SO 4 =1g: 9.8ml, add a certain amount of flake graphene material and microcrystalline cellulose in proportion to mix with concentrated sulfuric acid, the acid hydrolysis temperature is 45 ℃, the time is 60min-120min; add deionized water to stop the acid hydrolysis reaction, then Centrifugal washing is carried out at a centrifugal speed of 4000 rpm fo...

Embodiment 3

[0055] One-step preparation of highly dispersed graphene solution is characterized in that it includes cellulose nanocrystal / graphene flake suspension; wherein, graphene flake and cellulose nanocrystal suspension in cellulose nanocrystal / graphene flake suspension The mass ratio is 1-3:100.

[0056] The modifier nanocellulose is cellulose nanocrystal / graphene flake suspension, the amount of dry matter after the two are blended ranges from 20.2-20.6g, and its preparation method is: treat with sulfuric acid with a concentration of 64% Microcrystalline cellulose Microcrystalline cellulose, proportioning microcrystalline cellulose: H 2 SO 4 =1g: 9.8ml, add a certain amount of flake graphene material and microcrystalline cellulose in proportion to mix with concentrated sulfuric acid, the acid hydrolysis temperature is 45 ℃, the time is 60min-120min; add deionized water to stop the acid hydrolysis reaction, then Centrifugal washing is carried out at a centrifugal speed of 4000 rpm ...

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Abstract

The invention relates to a high-dispersion graphene solution prepared by virtue of a one-step method and a preparation method of the high-dispersion graphene solution. The high-dispersion graphene solution contains suspension liquid consisting of flake graphite and cellulose nanocrystals, wherein the mass ratio of flake graphite to cellulose nanocrystal in cellulose nanocrystal / flake graphite suspension liquid is (1-3) to 100. The preparation method compriss the following steps: (1) preparing the cellulose nanocrystal / flake graphite suspension liquid; (2) centrifuging the suspension liquid; (3) carrying out dialysis on the suspension liquid; and (4) carrying out ultrasonic treatment formation on the suspension liquid. The high-dispersion graphene solution has the advantages that (1) by preparing through the one-step method, the principle is simple, the operation is convenient, and the method is convenient, fast and suitable for industrial production; (2) hydroxide radicals on the surfaces of the cellulose nanocrystals can adequately react with surface active groups on the surface of a graphene slice layer, so that the graphene can be highly and uniformly dispersed; and (3) the high-dispersion graphene solution is low in cost, wide in source, controllable in process and good in applicability.

Description

technical field [0001] The invention relates to a one-step method for preparing a highly dispersed graphene solution and a preparation method thereof, belonging to the technical field of polymer composite materials. Background technique [0002] At present, green and environmentally friendly coatings are being promoted in various fields in the world. Therefore, low-pollution water-based coatings have become a new direction for the development of coating technology. Among them, water-based coatings are conducive to rational use of resources, prevention of environmental pollution, and protection of human health. VOC and harmful air pollutants have become a research hotspot. Water-based coatings have become the preferred variety due to their many technical approaches, wide application, safety, and relatively simple construction. However, water-based coatings are not only widely used in the field of architectural coatings, but also in other fields, especially in the field of ind...

Claims

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Application Information

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IPC IPC(8): C09D7/62C09D7/65
CPCC09D7/62C09D7/65C09D7/67
Inventor 吴燕孙英纯唐沁雯胥莉陶鑫张海桥黄子轩蔺秀媛
Owner NANJING FORESTRY UNIV
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