Nano-silver conductive ink and conductive film prepared by employing same

Abstract

The invention discloses nano-silver conductive ink and a conductive film prepared by employing the same. The technical scheme is characterized in that the nano-silver conductive ink is prepared, satisfies the requirements on light transmittance, film electrical resistance and adhesive force, is applicable to production of the conductive film; and the prepared conductive film is effectively controlled in flatness and easy to etch, is capable of effectively satisfying the requirements on patterning of touch-control screens and display panels, and has extremely good utility value.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a nano silver conductive ink and a conductive film prepared by using the ink. Background technique [0002] As a functional film with high light transmittance and low sheet resistance, transparent conductive film is widely used in touch screens, display panels, electromagnetic shielding, LED displays, electroluminescent devices, and thin-film solar cells. Based on the shortcomings of traditional ITO transparent conductive films such as resource shortage, high price, and prone to defects, those skilled in the art are currently devoting themselves to developing new alternative materials for transparent conductive films. Among them, metal nanomaterials, especially nanosilver materials, have become the most promising alternative materials for commercial use. [0003] At present, there have been many patent applications for transparent conductive films based on silver nanowires, bu...

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Problems solved by technology

[0003] At present, there have been many patent applications for transparent conductive films based on silver nanowires, but the usual processing technology is relatively complicated, and it takes several steps of transfer printing or repeated coating processes to finally achieve the required results.

Chinese patent applications 200910112924.X and 200910112925.4 disclose a method for preparing a transparent conductive film based on silver nanowires. The core idea is to increase the adhesion of silver nanowires on the substrate by adding an adhesion layer between the substrate and the nanowire conductive layer. Efforts have been made to basically solve the problem that the nanowires are easy to detach from the substrate, but the method used is relatively complicated, and the pre-prepared nanowire network needs to be transferred to the adhesion layer by transfer printing, which not only increases the difficulty of the process and Complexity, while the thickness of the silver nanowire network is difficult to control, which affects the light transmission of the final conductive film

The layering preparation process is complicated, and each layer needs to be dried after coating, which takes a long time and processing a new layer will inevitably cause damage to the existing layer, and the product yield will be greatly affected

Chinese patent application 201110444509.1 discloses another preparation method of transparent conductive film based on silver nanowires, which realizes a wide range of haze adjustment, but the polymer binders used in this patent are all insoluble resins, and the film formation is dry. Sometimes it will cause uneven crystallization and affect the light transmittance of the final film. This method can only obtain an overall conductive initial film, which cannot meet the requirements of the touch terminal for electrode pattern design.

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