Graphene composite conductive ink for ink-jet printing and preparation method thereof

Abstract

The invention discloses graphene composite conductive ink for ink-jet printing and a preparation method thereof. The graphene composite conductive ink comprises the following ingredients (by weight): 1-30 parts of graphene, 0.1-15 parts of multi-walled carbon nanotube, 0-7.5 parts of conductive carbon black, 290-320 parts of a mixed solvent, 0.2-10 parts of a surfactant, and 0.2-15 parts of a binder. The preparation technology is simple and feasible. According to the preparation technology, a series of steps that are hard to operate, such as tedious covalent modification, dipolar addition reaction, diazonium salt coupling, solvent exchange, etc. in the prior art are omitted; but by direct one-step grinding and mixing, the surface of a conductive filler is coated with the surfactant to prepare graphene ink with good dispersion. No poisonous reagents are used during the preparation process. The preparation method is suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of conductive ink, and in particular relates to a graphene composite conductive ink which can be used for inkjet printing and a preparation method thereof. Background technique [0002] The future development direction of electronic devices is flexibility, intelligence and functionality. With the development of electronic products and equipment in the direction of portability, thinness, and multi-function, flexible electronic devices have become a rapidly developing research field with a wide range of applications, such as touch screens, electronic paper, sensors, radio frequency identification tags, Photovoltaic cells, solar cells, conductive lines, etc. At present, the methods commonly used in the preparation of flexible electronic devices are: combining the substrate loaded with a large number of field effect transistors with the product through the transfer method, or directly growing on the target subs...

AI Technical Summary

Problems solved by technology

[0005] Graphene's special two-dimensional structure and large specific surface area, as well as the strong van der Waals attraction between graphene microsheets, make it difficult for graphene to disperse well in solvents and polymer matrices.

Although graphene oxide can be dispersed in most solvents, its conductivity is very low. Even after reduction, it can only restore part of its conductivity, which cannot meet the conductivity requirements of printed electronics.

At present, research on the preparation of graphene conductive inks generally focuses on the synthesis and dispersion of conductive fillers. Most of the preparation methods are cumbersome, resulting in a large waste of raw materials and high costs, and a large amount of toxic solvents such as DMF, NMP, Acetone, tetrahydrofuran, isophorone, etc.

Due to the addition of more resins and additives in the prepared graphene conductive ink, and the high boiling point of the organic solvent, it is difficult to volatilize, so the ink cannot be cured at a lower temperature and in a shorter time during the printing process, which limits Its application in the field of printed electronics

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