Preparation of dope for shielding electromagnetic interference (EMI) with temperature and humidity resistance properties

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作者：
School of Electronics and Information Eng., Tianjin Univ., Tianjin 300072, China [1 ]
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来源：
Shanghai Jiaotong Daxue Xuebao | 2007年 / SUPPL.卷 / 79-82期
关键词：
Atmospheric humidity - Coatings - Electric properties - Electromagnetic wave interference - Epoxy resins - Nanostructured materials - Resistors - Silver;
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摘要：
A kind of dope for shielding electromagnetic interference (EMI), with temperature and humidity resistance, was obtained by epoxy resin, acid anhydride, glycol, alcohol and nano-sliver powder. The experiment shows that the membrane obtained at 190°C has good electrical performance with square resister value about 0.035 mΩ/D). The continuous temperature resistance experiment, at -45°C and 70°C for 24 h respectively, shows the membrane obtained keeps its original appearance without any frothiness and breaking off. In the alternating temperature and humidity resistance experiment in 5 periods, with each period including RH95% at (60 ± 5)°C for 18 h and RH95% at (30 ± 5)°C for 6h, the membrane also keeps its integrity. The shielding electromagnetic interference (EMI) test shows the shielding effectiveness (SE) ranges 40-60 dB.
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