Preparation method for ink-jet graphene and carbon nano tube conductive ink

A technology of carbon nanotubes and conductive inks, applied in inks, applications, household appliances, etc., can solve the problems of lengthy and complicated preparation processes, not meeting the requirements of inkjet applications, reduce the preparation process, and solve the problem of inkjet printing machines that are easy to clog Nozzle problem, the effect of simple method

Inactive Publication Date: 2014-12-17
李娟 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current preparation process: the combination of graphene and carbon nanotubes to prepare conductive ink usually requires the preparation of graphene nanosheets in advance, and then separately prepares graphene and carbon nanotube dispersions, and then blends and disperses th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of ink-jet graphene and carbon nanotube conductive ink of the present invention comprises the following steps:

[0027] Step a: Preparation of a mixed dispersion of graphene and carbon nanotube conductive units

[0028] Ball milling process: Add the mixture of graphite-based raw materials and carbon nanotubes accounting for 10~20g and 30~100g of additives into the ball milling tank, and perform ball milling at room temperature to obtain the mixture. The ball milling speed is 50rpm~500rpm. The time ranges from 10 minutes to 24 hours, and the mass ratio of graphite-based raw materials to carbon nanotubes is 1:100~100:1;

[0029] Primary selection process: add the mixture obtained in the above steps to 500~1500mL of the first solvent, stir mechanically or ultrasonically for 0.5~6h, and then stand still to obtain the upper dispersion;

[0030] Washing process: pour out the upper layer dispersion liquid obtained in the primary selection process, carry...

Embodiment 1

[0045] 5g of natural graphene powder and 5g of carbon nanotubes were mixed with 50g of D-type tartaric acid, added to a ball mill jar with a capacity of 1000mL, and ball milled at 500rpm for 12h. After cooling to room temperature, the mixture was taken out. The mixture was dispersed in 1500mL distilled water, mechanically stirred for 30min, ultrasonicated for 10min, and left to stand. The upper dispersion was collected. Suction filter and wash the dispersion until barium hydroxide solution with pH=9 is added dropwise to the filtrate, and no white precipitate occurs. The filtrate obtained by suction filtration was redispersed with distilled water, mechanically stirred for 30 minutes, ultrasonicated for 10 minutes, and the dispersion was centrifuged at 2000 rpm for 20 minutes, and the upper layer of the dispersion was taken, and repeated twice.

[0046] Add polyvinylpyrrolidone (PVP) to the above dispersion to make the concentration 0.5 mg / mL, distill and concentrate to a soli...

Embodiment 2

[0048] Mix 2g of expanded graphite, 6g of carbon nanotubes, and 40g of isophthalic acid, add it to a ball mill jar with a diameter of 800mL, and mill it at 500rpm for 12h. After cooling to room temperature, the mixture is taken out. Then the mixture was dispersed in 1000mL water / ethanol mixed solution, the volume ratio of water and ethanol was 1:1, mechanically stirred for 30min, ultrasonicated for 10min, and left to stand. Collect the upper dispersion. Suction filter and wash the dispersion until the filtrate is neutral. Then re-disperse the filtrate obtained by suction filtration with distilled water, mechanically stir for 30 minutes, and sonicate for 10 minutes; centrifuge the dispersion at 1000 rpm for 20 minutes, take the upper dispersion, and repeat twice.

[0049] Then add polyvinylpyrrolidone (PVP) to the above dispersion to make the concentration 0.3 mg / mL and Tween-20 to make the concentration 0.1 mg / mL, distill and concentrate to a solid content of 80%, pour into ...

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Abstract

The invention discloses a preparation method for ink-jet graphene and carbon nano tube conductive ink. The preparation method comprises the following steps: preparation of a graphite and carbon nano tube mixed dispersion liquid and mixing of ink, wherein the preparation of the graphite and carbon nano tube mixed dispersion liquid comprises the processes of ball-milling, initial separating, washing, separating and collecting. According to the preparation method, particle mixing, dispersing and particle dimension separating in the preparation of graphene and ink are organically combined, so that the preparation processes of the conductive ink are effectively reduced; and the process for preparing the graphene by selecting effective auxiliaries by use of a ball-milling method can be used for large-scale preparation, is simpler in comparison with the oxidization-reduction which is in common use at present as well as a CVD (chemical vapor deposition) method, efficient, and low in cost. After the ball-milling and separating processes, the particle dimension is controlled, so that fine filtration is not needed, and thus, the preparation process for the ink-jet conductive ink is continuously simplified.

Description

technical field [0001] The invention relates to a preparation method of graphene and carbon nanotube conductive ink for inkjet, in particular to a graphene and carbon nanotube for inkjet inkjet with small particle size, not easy to block the nozzle, and good particle dispersibility Preparation method of conductive ink. Background technique [0002] Traditional conductive inks are compounded by adding conductive unit powder to polymers. The conductive functional unit is the most critical component, mainly including carbon, metal or metal oxides, and conductive polymers. Gold, silver and copper paste inks have excellent conductivity, and the resistance value can reach 10 -2 ~l0 -3 Wcm; gold and silver inks have good performance, but are expensive, and silver itself has defects such as easy migration, vulcanization, poor resistance to solder erosion, and easy cracking during sintering. Under the action of air and water, copper paste ink will produce an oxide layer to make ...

Claims

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Application Information

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IPC IPC(8): C09D11/52C09D11/38
Inventor 陆建辉王玉丰李金焕肖军
Owner 李娟
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