Low Pine Than The Silver Flake Conductive Phase Polymer Slurry Preparation Technology And Performance

Silver has excellent conductivity, thermal conductivity and chemical stability, resulting in the other metals are difficult to replace it. Therefore, based on the silver paste, it is of great significance to improve the silver in the resin dispersion of silver paste in order to reduce the amount of silver. In this topic, a bulk density smaller flake silver powder is used as conductive phase, and the preparation of a performance is similar to conventional silver paste, but the relative amount of conductive silver paste is significantly reduced.This article first describes the system development of domestic and international electronic paste, and then there were carry out systematic research in four areas, including the basic process conditions determination of paste, the choice of adhesives, the determination of the best ratio of the paste, the micro-analysis of the lower loose density flake silver powder, the market conditions of the silver powder and silver paste. the following conclusions was drawn:Through a large number of experiments, the best preparation of silver paste formula is get as follows:resin, polyurethane resin, BY1010, its quality content,24%; thickener for Associative Thickener 2026, accounting for 16%; mixed solvent (NBA+CYC+783 slowly dry-water), accounting for 16%; silane coupling agent, accounting for 4%; conductive filler, lower loose density flake silver powder (bulk density of 0.43g/cm3), accounting for 40%, curing process conditions of 130℃for 40min and the grinding time for curing 40min-50min.Microstructure analysis of the lower loose density flake silver powder was found:(1) the size of spherical silver powder is the smallest and its corresponding surface area ratio is the largest. the bulk density of flake silver power was related to the corresponding ratio of surface area, the larger is the bulk density, and the larger of the surface area of its powder; but not much relationship with powder particle size.It was found by SEM and EDS in conductive silver paste, with the bulk density of silver power was decreased, the microstructure of the conductive silver paste becomes more dense, black holes will be less; the distribution of silver of the lower loose density flake silver powder in conductive silver paste was much more, indicating the surface density of the lower loose density flake silver powder in conductive silver paste is good.Market analysis shows that there is no businesses to invest in the establishment of an international first-class development, production platforms, which will restrict the silver powder, silver paste projects in national development, it can not be achieved industrialization. We study the lower loose density flake silver powder and silver paste, if applied to the market, it will get net profit 80.1 million yuan / year, with significant economic benefits.