Graphene paste and conductive ink and preparation methods of graphene paste and conductive ink

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

Active Publication Date: 2020-01-17
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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  • Graphene paste and conductive ink and preparation methods of graphene paste and conductive ink
  • Graphene paste and conductive ink and preparation methods of graphene paste and conductive ink
  • Graphene paste and conductive ink and preparation methods of graphene paste and conductive ink

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preparation example Construction

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

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

[0059] (2) In the electrolyte, graphite is used as a positive electrode, and an operating voltage is applied 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 it at -56°C ~ - 35h~55h at 44°C to obtain graphene;

[0061] (4) Mix the graphene, dibasic acid ester, and ethanol, and remove the ethanol after homogeneous treatment to obtain graphene slurry.

[0062] In one embodiment, the homogenization treatment conditions 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 includes but not limit...

Embodiment 1

[0075] (1) Preparation of graphene slurry

[0076] 1) Configure 100mL 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 0.1mol / L, and put it into a 120mL 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 suspended liquid after stripping into a suction filter, and wash three times successively with 300 mL deionized water and 300 mL ethanol.

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

[0080] The scanning electron micrograph of the graphene powder that this step prepares sees figure 1 , XRD, Raman, ...

Embodiment 2

[0090] (1) Preparation of graphene slurry

[0091] 1) Configure 100mL of mixed electrolyte of sulfuric acid and sodium sulfate with a molar ratio of 0.5 (the solvent is deionized water), the total concentration is 0.3mol / L, and put it into a 120mL 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 suspended liquid after stripping into a suction filter, and wash three times successively with 300 mL deionized water and 300 mL ethanol.

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

[0095] 5) Mix 1.5g of the obtained graphene powder, 25mL of dibasic acid ester, and 80mL of ethanol, and disperse homogeneously at 8000rpm for 60mi...

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Abstract

The invention relates to a graphene paste and a conductive ink and preparation methods of the graphene paste and the conductive ink. The graphene paste is prepared from the raw materials: graphene, dibasic esters and ethanol, wherein corresponding to 1.5 g of graphene, the use amount of dibasic esters is 20-100 mL and the use amount of ethanol is 50-250 mL; graphene is obtained by the following preparation method which comprises the steps that an electrolytic solution containing sulfuric acid and sulfate is obtained; in the electrolytic solution, graphite is used as a positive electrode, working voltage is applied to strip the graphite to obtain a suspension; and a liquid portion of the suspension is removed, an obtained solid portion is washed and subjected to ultrasonic processing, and the obtained solid portion is first placed under the conditions of -100 DEG C to-60 DEG C for 2h-8h and then placed at -56 DEG C to -44 DEG C for 35h-55h. The graphene paste is prepared by using graphene prepared by a specific process as a raw material and matching dibasic esters as a main solvent, and the stability, printability and printed circuit conductivity of the ink prepared by the graphenepaste meet application requirements.

Description

technical field [0001] The invention relates to the technical field of graphene materials, in particular to a graphene slurry, 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 nano-material 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 the conductive filler of conductive ink, graphene not only has excellent conductivity but also has excellent corrosion resistance and oxidation resistance. It is one of the printed electronic materials with the most potential for popularization and application, and has broad application prospects. [0003] At present, the prepara...

Claims

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Application Information

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Patent Type & Authority Applications(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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