Research and Application of Conductive Silver Adhesive in Electromagnetic Shielding Materials

A film with good mechanical properties for electromagnetic shielding was prepared by using flake silver powder as a conductive medium and a mixture of epoxy resin, curing agent, and accelerator as a film-forming agentConductive silver adhesiveThe electromagnetic shielding performance of silver paste in the 100kHz~18GHz frequency range after curing was discussed when the mass fraction of silver powder in silver paste was 75% and 81%. The higher the silver content, the better the electromagnetic shielding performance in the 15M~18GHz high-frequency band, which can reach 17~51dB Analyzed the relationship between the conductivity of silver paste and its electromagnetic shielding effectiveness; Further verify its electromagnetic shielding effect at the microscopic level through scanning electron microscopy observation; When the silver content is 81%, its tensile strength is 1.20MPa

ThisConductive silver adhesiveThe components include 100 parts by weight of resin composition, 0.1-3 parts by weight of thixotropic agent, 1-15 parts by weight of diluent, 0.1-5 parts by weight of coupling agent, and 300-400 parts by weight of silver powder After mixing the resin composition and diluent evenly, add a thixotropic agent and a coupling agent, and place it in a planetary vacuum defoaming mixer to stir at 750 rpm for 2 minutes. Then add silver powder and continue to stir in the planetary vacuum defoaming mixer at 750 rpm for 2 minutes. Finally, vacuum defoam at 1300 rpm for 1.5 minutes to obtain the conductive silver adhesive product Compared with existing technologies, the present invention has advantages such as good conductivity, electromagnetic shielding, aging resistance, and reworkability.

Conductive silver pasteIt is an industrial coating material and a type of conductive paste. Conductive paste is a type of electronic paste, so conductive silver paste also belongs to electronic paste. There are various conductive substances in conductive paste, such as precious metal silver powder, silver coated copper powder, base metal copper powder, nickel (N) powder, aluminum powder, tungsten, molybdenum, manganese, and conductive inorganic powders such as carbon powder, graphene, etc. Conductive silver paste is a conductive paste with different silver contents, and its conductivity is mainly achieved by silver powder. Pulp is a "slurry", usually referring to a blend of carrier bonding phase, additives, and additives, which plays a role in carrying and enhancing conductive substances.

The function of conductive silver paste is twofold: firstly, it is conductive, and secondly, it is adhesive.