| Abstract Electromagnetic shielding waterborne coatings was developed, with acrylic emulsion and silver plated copper powder as main raw material, wetting agent, dispersing agent, defoamer, leveling agent and water as additives. The process of coating preparation is as following: first,wetting agent, dispersing agent, first part of defoamer and silver plated copper were mixed, then emulsion was added and stired for some time, lastly leveling agent and the rest of defoamer were put into to obtain electromagnetic shielding coatings.The effects of the content of silver plated copper powder, water, and different emulsion on the conductivity and electromagnetic shielding property were discussed by conductive mechanism，electromagnetic shielding theory and the microcosmic structure of coatings. The shielding efficiency of the electromagnetic shielding waterborne coatings is 55—65 dB at range of frequency 100 kHz—15 GHz. |
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2011, Vol. 28 
