What Is The Effect Of The Silver-plated Hollow Glass Beads For Shielding Materials?

Compared with traditional shielding materials such as metal plates and wire meshes, silicon rubber made of silver-plated hollow glass beads, a special raw material for electromagnetic shielding, not only provides good electromagnetic shielding capabilities, but also inherent rubber elasticity provides protection against water vapor. The function of sealing is therefore widely used in aerospace, aviation, ships, ships, tanks, workstations, computers, data communications, medical care, household appliances, etc. In the sealing system of electronic and electrical equipment, the silicone rubber made of hollow glass beads plays the dual purpose of environmental sealing and electromagnetic shielding, so as to achieve an electromagnetic compatibility environment in which electronic and electrical equipment and the system are reconciled and coexist, suppress electromagnetic interference, and avoid Leakage of important information to ensure the country’s political, economic, and military security.

Silver-plated hollow glass beads have the characteristics of light weight, stable chemical properties, and heat radiation resistance. Depositing a conductive metal film such as Ag on its surface can achieve reflection loss of electromagnetic waves. At present, the research on silver-plated glass beads focuses on the preparation process of silver-plated glass, and the reports of electromagnetic shielding silicone rubber prepared by filling them are relatively rare. The technical staff of Senhui Company made relevant tests on this. We prepared conductive silicone rubber with silver-plated glass beads as fillers, and studied the influence of silver-plated glass beads on the mechanical properties and electromagnetic shielding effectiveness of silicone rubber.

The rubber compound is mixed on the XK-230 open mill. The feeding sequence is 110-2 methyl ethyl silicone rubber, structure control agent, gas phase nano-silica, coloring agent, and the mixed compound- -Divide into two parts, continue to add glass silver-plated powder, and add vulcanizing agent to the last two parts of the compound on the open mill and mix them evenly. One-stage vulcanization is carried out on a flat vulcanizer, with constant vulcanization temperature, vulcanization time and vulcanization pressure parameters; second-stage vulcanization is carried out in an oven.

The performance test of silver-plated hollow glass microspheres was carried out in accordance with the sample preparation method specified in the relevant standards. The samples of silica gel and conductive rubber were respectively prepared for mechanical performance tests. The test results are shown in Table 1. According to the sample preparation method specified in the relevant standards, the conductive rubber samples were tested for electromagnetic shielding effectiveness. The test results are shown in Table 2.