Printing conductive silver paste

Abstract

The invention relates to the technical field of printing, in particular to printing conductive silver paste. The printing conductive silver paste comprises the following components in parts by mass: 20-35 parts of spherical silver powder, 15-25 parts of epoxy modified polyester resin, 20-25 parts of flake silver powder, 8-12 parts of thermoplastic polyimide resin, 10-13 parts of epoxy resin and 3-6 parts of polymer resin. After the formula is adopted, the printing conductive silver paste is unique in design, reasonable in composition, convenient to prepare, excellent in conductivity and good in adhesive force with a base material, the adhesiveness, processability, hardness and diffusivity of the coating are guaranteed while the conductivity and mechanical properties of the coating are improved, and the environmental pollution is small.

Description

technical field [0001] The invention relates to the technical field of printing, in particular to a printing 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,...

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 cover the silver powder, resulting in poor adsorption of the silver powder on the surface and falling off.