| 摘要 |
<p>1516874 Electric resistance heating WACKER CHEMIE GmbH 29 July 1975 [30 July 1974] 31672/75 Heading H5H [Also in Division C3] A conductive terminal strip is attached to a flexible sheetlike electrical resistance heating element by an electrically conductive, heat vulcanizable adhesive and after vulcanizing, the conductor strip is stretched at room temperature to the length it had at the vulcanizing temperature. By this means, wrinkles are removed that would otherwise, in use, cause rapid deterioration of the element. The conductor strip is of woven or non-woven aluminium, copper or silver, and the resistance heating element a non-conductive plastics film or fleece or a woven or non-woven glass fabric with a resistance coating on both sides preferably of carbon dispersed in a silicone polymer. The adhesive may be a silicone base with dispersed carbon powder. "Prior art" is described using cold-setting adhesives (e.g. acrylate or silicone) containing copper turnings or silver or carbon powder. An exemplary conductive adhesive involves mixing of a divinylsiloxy-terminated diorganopolysiloxane with vinylmethylsiloxane, dimethylpolysiloxane silicon dioxide perchloroethylene and acetylene black. After standing the dispersion is diluted with more perchloroethylene and small amounts of platinum IV chloric acid and a mixed polymer of methylhydrogenosiloxane and dimethyl siloxane is added. This adhesive is curable at 300‹C.</p> |
