A kind of conductive silver paste and its preparation method and application

Abstract

The invention discloses a conductive silver paste and its preparation method and application. The conductive silver paste is prepared from the following raw materials in parts by weight: conductive silver powder 50-70; betaine 2-3; dehydroabietic acid 2-3 ; Polyurethane 3-10; Polyester resin 5-8; Solvent 8-10; Additive 2-4; Auxiliary 0.7-1; Organic metal salt 0.2-0.4. Polyurethane is added to the raw material for the preparation of the conductive silver paste of the present invention, which has low thermal conductivity and good moisture-proof and waterproof properties, and also has various excellent properties such as fire prevention, flame retardancy, and high temperature resistance, which improves the conductive silver paste of the present invention. The safety performance after being prepared into electronic products; the synergistic effect between betaine and dehydroabietic acid makes the compatibility between materials better, improves the compatibility between conductive silver powder and resin matrix, and improves the conductivity of conductive silver paste performance, reducing the amount of conductive silver powder used, improving the conductivity of the material, and reducing production costs.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a conductive silver paste and its preparation method and application. Background technique [0002] Silver is one of the transition metals. Its physical and chemical properties are relatively stable, and it also has good thermal and electrical conductivity. Therefore, silver is widely used in modern industry. With the rapid development of the electronic product manufacturing industry, the amount of silver used in industry continues to increase. The main reason is that the use of electronic and electrical fields has increased significantly. Silver powder and silver paste have gradually become one of the main ways of using silver. Conductive silver paste is a special functional material, generally composed of conductive functional phase, matrix resin binder phase, solvent and other auxiliary additives. The conductive functional phase is usually conductive metal powder, and the...

AI Technical Summary

Problems solved by technology

The conductive silver paste in the prior art usually uses nano-silver powder as a conductive filler, which is prepared by mechanically mixing and rolling it with polymer resin, organic solvent and additives in a certain proportion. The compatibility of the product is poor, resulting in a large resistivity of the finished product, which affects its electrical conductivity

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