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A kind of graphene slurry and conductive ink and preparation method thereof

A technology of conductive ink and graphene, which is applied in the direction of ink, household utensils, applications, etc., can solve the problems that the structural defects of graphene oxide cannot be completely repaired, and the electrical performance needs to be improved, so as to achieve adjustable performance, simple and gentle process, and method The effect of green environmental protection

Active Publication Date: 2022-08-09
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common problem of pre-reduction and post-printing reduction is that the reduction process cannot completely repair the structural defects of graphene oxide, and the electrical properties need to be improved.
[0008] Generally speaking, the performance of ink prepared from graphene obtained by the above-mentioned traditional method needs to be improved to meet the requirements of ink stability, printability and conductivity of printed circuit in application.

Method used

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  • A kind of graphene slurry and conductive ink and preparation method thereof
  • A kind of graphene slurry and conductive ink and preparation method thereof
  • A kind of graphene slurry and conductive ink and preparation method thereof

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preparation example Construction

[0057] The present embodiment also provides the above-mentioned preparation method of the graphene slurry, and the preparation method comprises the following steps:

[0058] (1) obtain the electrolyte that contains sulfuric acid and sulfate;

[0059] (2) in the electrolyte, using graphite as the positive electrode, applying a working voltage to peel off the graphite to obtain a suspension;

[0060] (3) Remove the liquid part in the suspension, wash and sonicate the obtained solid part, and then place it at -100°C~-60°C for 2h~8h, and then place at -56°C~- Under the condition of 44°C for 35h~55h, graphene is obtained;

[0061] (4) mixing the graphene, divalent acid ester and ethanol, and removing the ethanol after homogenization to obtain a graphene slurry.

[0062] In one embodiment, the conditions for the homogenization treatment include: a speed of 3000 rpm to 10000 rpm, and a time of 30 min to 80 min.

[0063] In one embodiment, the method of removing the ethanol include...

Embodiment 1

[0075] (1) Preparation of graphene slurry

[0076] 1) Prepare 100 mL of a mixed electrolyte of sulfuric acid and ammonium sulfate with a molar ratio of 1:1 (the solvent is deionized water), with a total concentration of 0.1 mol / L, and put it into a 120 mL electrolytic cell.

[0077] 2) 2cm×5cm graphite foil and 2cm×2cm platinum sheet were used as positive and negative electrodes respectively, and a working voltage of 10V was applied to gradually peel off the graphite foil.

[0078] 3) Pour the peeled suspension liquid into a suction filter, and wash three times in turn with 300 mL of deionized water and 300 mL of ethanol.

[0079] 4) Then put it into a beaker, add 200 mL of deionized water, ultrasonically break it for 10 minutes, place it in a -80°C refrigerator for pre-freezing for 6 hours, and then put it into a freeze dryer and freeze-dry it at -50°C for 48 hours to obtain 8% oxygen content. Graphene powder.

[0080] The scanning electron microscope photo of the graphene ...

Embodiment 2

[0090] (1) Preparation of graphene slurry

[0091] 1) Prepare 100 mL of a mixed electrolyte of sulfuric acid and sodium sulfate with a molar ratio of 0.5 (the solvent is deionized water), with a total concentration of 0.3 mol / L, and put it into a 120 mL electrolytic cell.

[0092] 2) 2cm×5cm graphite foil and 2cm×2cm platinum sheet were used as positive and negative electrodes respectively, and a working voltage of 10V was applied to gradually peel off the graphite foil.

[0093] 3) Pour the peeled suspension liquid into a suction filter, and wash three times in turn with 300 mL of deionized water and 300 mL of ethanol.

[0094] 4) Then put it into a beaker, add 200 mL of deionized water, ultrasonically break it for 10 minutes, place it in a -100°C refrigerator for 2 hours, and then put it in a freeze dryer at -56°C for 35 hours.

[0095] 5) 1.5g of the obtained graphene powder, 25mL of divalent ester, and 80mL of ethanol were mixed, and homogeneously dispersed for 60min at 8...

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Abstract

The invention relates to a graphene slurry and conductive ink and a preparation method thereof. The raw materials of graphene slurry include graphene, divalent ester and ethanol; the amount of divalent ester corresponding to every 1.5g of graphene is 20-100mL and the amount of ethanol is 50-250mL; graphene is obtained by the following preparation method : obtaining an electrolyte solution containing sulfuric acid and sulfate; in the electrolyte solution, using graphite as the positive electrode, applying a working voltage to exfoliate the graphite to obtain a suspension; removing the liquid part in the suspension, and carrying out the solid part of the obtained Washing, ultrasonic treatment, and then placed at -100℃~-60℃ for 2h~8h, and then placed at -56℃~-44℃ for 35h~55h. The graphene slurry is prepared by using graphene prepared by a specific process as a raw material and a divalent ester as a main solvent, and the ink stability, printability and conductivity of the printed circuit prepared by the graphene slurry meet the application requirements.

Description

technical field [0001] The invention relates to the technical field of graphene materials, in particular to a graphene slurry and conductive ink and a preparation method thereof. Background technique [0002] With the rapid development of the electronics industry, conductive inks are more and more widely used in flexible printed circuits, membrane switches, radio frequency identification and other fields. Compared with traditional metal-based conductive ink and silver nanomaterial conductive ink, graphene conductive ink has higher stability and lower cost; compared with carbon-based conductive ink, it has lower resistivity and better conductivity. As a conductive filler for conductive inks, graphene not only has excellent electrical conductivity but also has excellent corrosion resistance and oxidation resistance. It is one of the most popular printed electronic materials and has broad application prospects. [0003] At present, the preparation of graphene conductive ink ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/52
CPCC09D11/52
Inventor 李静李文博王佳伟刘静刘丹阳李炯利王旭东
Owner 北京石墨烯技术研究院有限公司
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