| 摘要 |
#CMT# #/CMT# The panel form electrically conductive film useful as floor heater under tiles or wooden floorings, comprises a thermoplastic matrix with reinforcing fibers (3-45 wt.%) and electrical contacts, and additives (7 wt.%). The reinforcing fibers consist of electrically conductive reinforcing fibers with a fiber length of 3-6 mm and a thickness of 5-8 mu m. The electrically conductive reinforcing fibers are present in the foil isotropically in x-y direction in the thermoplastic matrix. The ratio of the electrical conductivity from the x to the y-direction is 1-3 to 1.2-2.2. #CMT# : #/CMT# The panel form electrically conductive film useful as floor heater under tiles or wooden floorings, comprises a thermoplastic matrix with reinforcing fibers (3-45 wt.%) and electrical contacts, and additives (7 wt.%). The reinforcing fibers consist of electrically conductive reinforcing fibers with a fiber length of 3-6 mm and a thickness of 5-8 mu m. The electrically conductive reinforcing fibers are present in the foil isotropically in x-y direction in the thermoplastic matrix. The ratio of the electrical conductivity from the x to the y-direction is 1-3 to 1.2-2.2. The conductive reinforcing fibers are carbon fibers, metal fibers and/or conductive endowed thermoplastic fibers. The portion of the electrically conductive reinforcing fibers is 0.5-20 wt.%. Additional reinforcing fibers are present beside the electrically conductive fibers and have a fiber length of 6-12 mm. The additives are binders, tribologically effective additives, and additives for the stability, impact strength, temperature stability, heat conductivity, abrasion stability and/or electrical conductivity, and are used in the form of fibers, fibrils, fibrids, pulp, powders, nano-particles, nano-fibers and/or mixtures. The electrical conductivity of the foil is adjusted by the variation of the density of the foil with a predetermined part by weight of the conductive reinforcing fiber or by the variation of the part by weight of the foil with a predetermined density of the conductive reinforcing fiber. The foil has holes with same or different geometry, or perforations, which form a pattern. The electrical conductivity of the foil is adjusted by the perforations and/or holes with the predetermined thickness and/or part by weight of the conductive reinforcing fiber. The conductive film has a density of 0.25-6 g/cm 3>, and a thickness of 30-350 mu m. The electrical contact is an integral component of the conductive foil, and is formed by a copper contact path in a form of a strip in two boundary regions of the foil. The conductive film is present in panel form and two plates are connected with one another by contact points in an electrically-conducting manner. The connection takes place by crimping, serrated lock washers, soldering, welding, rivets, plug connectors, pushbuttons and/or adhesive tapes. The film is three-dimensionally deformed. A layer made of electrically isolating material is applied on the both surface of the film. An independent claim is included for a method for the production of a conductive foil. #CMT#USE : #/CMT# Panel form electrically conductive film useful as floor heater under tiles or wooden floorings (all claimed). #CMT#ADVANTAGE : #/CMT# The panel form electrically conductive film: does not need foil lamination and laminating adhesive, thus avoiding adhesive aging with possibilities of the change of the electrical transition resistance; has high internal stability, no danger of the internal separation of the foil with the danger from openly lying conductive fiber ends and the danger of the sparking and the fire development, no corrosion of the conductive fibers by break or milling loading and no danger of spark formation by conductive, fiber-free fragments; can incorporate at the same height metallic conductive strips; can produce homogeneous, full surface heating without local damages of the heating foil; has no surface-pressure-dependent change of the electrical resistance; and is independent of humidity and electrical resistance. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The diagram shows a graphical representation of the steam permeability of the material of the conductive film as a function of the surface resistance (Drawing includes non-English language text). #CMT#POLYMERS : #/CMT# Preferred Components: The additional reinforcing fibers are glass fibers, aramide fibers, ceramic fibers, polyether imide fibers, polybenzoxazole fibers and/or natural fibers. The thermoplastic matrix is formed from polyetherketone, poly-p-phenylene sulfide, polyether imide, polyethersulfone, polyethylene, polyethylene terephthalate, perfluoro alkoxy polymer, polyamide and/or polysulfone. The binder is polyacrylate, polyvinyl acetate, polyvinyl alcohol, polyurethane, resins, polyolefins, aromatic polyamide and/or copolymers. |
