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

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.