Graphene composite conductive silver paste

Abstract

The invention relates to the technical field of silver paste, in particular to a graphene composite conductive silver paste. The graphene composite conductive silver paste comprises, 5 to 15 part of bisphenol A epoxy resin, 2 to 5 parts of polyester-type hyperbranched epoxy resin, 30-50 part of grapheme-nanometer Ag composite powder, 10-20 part of silver-coated lead-free glass powder, 22-34 partsof organic solvent and 0. 1-10 part of pH buffer. The invention has the advantages of unique design, reasonable composition, convenient preparation, excellent electric conductivity, good adhesion to the substrate, high electric conductivity and mechanical performance of the coating, and at the same time, the adhesion, processability, hardness and diffusion of the coating are ensured, and the environmental pollution is small.

Description

technical field [0001] The invention relates to a silver paste, in particular to a graphene composite conductive silver paste. Background technique [0002] As a functional printing material, conductive paste has been widely used in electronic information products due to its good physical properties. With the development of electronic products to be lighter, thinner, more functional and more environmentally friendly, its Performance also puts forward higher requirements. Among them, the low-temperature halogen-free conductive silver paste is widely used in membrane switches, capacitive electrodes, touch screens, etc. because of its excellent electrical conductivity, thermal conductivity, and practicability. Low-temperature conductive silver paste is a uniform paste made by stirring and dispersing conductive silver powder as a conductive filler with high polymer resin, solvent, curing agent, and additives. After the conductive silver paste is coated on the substrate, it is ...

AI Technical Summary

Problems solved by technology

Conductive silver powder is a metal powder with relatively high hardness, but the hardness of high polymers such as resin is generally poor

However, when the demand for high hardness is met by increasing the filling amount of silver powder, a relatively small amount of resin cannot fully and effectively coat the silver powder, resulting in poor adsorption of the silver powder on the surface and falling off.