导电玻璃微珠填充电磁屏蔽硅橡胶的研究

摘要

The high performance electromagnetic shielding rubber was prepared with silicone rubber filled with silver plated glass microsphere,nickel plated glass microsphere and Ag/Ni/glass composite microsphere.The effect of different conductive glass microsphere on the electrical conductivity,electromagnetic shielding performance of 10kHz~6GHz and mechanical properties in the silicon rubber was studied.The result shows that the electromagnetic shielding silicone rubber is of best conductivity filled with 65% weight percent Ag/Ni/glass microsphere.The shielding effectiveness of silicone rubber with Ag/Ni/glass microsphere increases in low frequency due to the presence of nickel and the shielding effectiveness is 74.6dB in 10kHz~300MHz band,rising up to a maximum of 98.8dB when the frequency is higher than 300MHz.The Shaw(A)hardness of electromagnetic shielding rubber is 78,and the tensile strength is 2.7MPa,and the elongation is 176%,respectively.Silicone rubber filled with Ag/Ni/glass microsphere is of wide electromagnetic shielding band,good overall shielding effect and good mechanical properties.%以自制镀银玻璃微珠、镀镍玻璃微珠、银镍复合镀玻璃微珠作为导电填料,硅橡胶作为基胶,制备出了高效电磁屏蔽橡胶.研究了导电玻璃微珠对硅橡胶的导电性能,10kHz~6GHz频段内的电磁屏蔽性能及力学性能的影响.结果发现:电磁屏蔽硅橡胶最佳的导电填料为65%银镍复合镀玻璃微珠,在10kHz~300MHz范围内,屏蔽效能稳定在74.6dB左右,从300MHz开始有所上升,最高达到98.8dB,电磁屏蔽橡胶的邵氏(A)硬度为78,拉伸强度2.7MPa,扯断伸长率176%;银镍复合镀玻璃微珠填充硅橡胶的电磁屏蔽频带最宽,整体屏蔽效果最好,机械性能较好.