Conductive adhesive for wet electrostatic precipitator panel
View Patent ↗A conductive adhesive is provided useful for providing electrically conductive joints in joins between panels, particularly conductive carbon composite panels in a WESP, is prepared from a corrosion resistant resin and particulate carbon black which is uniformly dispersed in the resin.
1. A method of assembly of a wet electrostatic precipitator (WESP) conductive carbon composite panel comprising corrugated strips of conductive carbon composite panels adhesively bonded together using an electrically-conductive adhesive composition, the composition comprising a polyunsaturated resin which, following polymerization, exhibits resistance to corrosion and heat distortion, and a carbon black filler uniformly dispersed in the resin, the method comprises:
molding conductive carbon composite material into corrugated form;
abrading mating surfaces of adjacent panels to expose carbon fibres; and
adhering adjacent corrugated strips at their abutting corrugations to form a hexagonal tube bundle.
2. The method of claim 1 wherein the polyunsaturated resin is a polyunsaturated vinyl ester resin.
3. The method of claim 2 wherein said polyunsaturated vinyl ester resin is an epoxy novolac vinyl ester resin.
4. The method of claim 1 wherein said carbon black filler is present in an amount of about 10 to about 30 wt %.
5. The method of claim 1 wherein the composition further comprises at least one cross-linking agent for said polyunsaturated resin.
6. The method of claim 5 wherein the cross-linking agent is cumyl hydroperoxide.
7. The method of claim 1 wherein the composition further comprises at least one curing accelerator.
8. The method of claim 7 wherein said curing accelerator is cobalt naphthalate.
9. The method of claim 1 wherein the composition further comprises a solution of paraffin wax and styrene.
10. The method of claim 1 wherein the electrically conductive adhesive composition is formed by a method comprising:
mixing a paste of finely divided carbon black filler with a polyunsaturated resin which, following polymerization, exhibits resistance to corrosion and heat distortion, along with other optional additives other than a cross-linking agent for said resin under high shear to fully disperse the carbon black filler and optional additives in the resin to form a homogenous mixture.