AN ELECTRICALLY CONDUCTIVE MULTI-LAYER MATERIAL

Abstract

The invention relates to conductive multi-layer materials for leak detection applications. The electrically conductive multi-layer material comprises a woven glass fibre web (2) having a binding agent (4) and a fire retardant compound (5), which is impregnated with electrically conductive carbon particles (6), wherein one side of the glass fibre web (2) is coated with metallic electrically conductive layer (10) by the means of vacuum deposition.

Claims

1. Electrically conductive multi-layer material (1) for applying it under a non-conductive water insolation layer, comprising a woven glass fibre web (2) which comprises a binding agent (4) and a fire retardant compound (5), and is impregnated with electrically conductive carbon particles (6), wherein one side of the glass fibre web is coated with metallic electrically conductive layer (10) by the means of vacuum deposition.

2. The Electrically conductive multi-layer material (1) according to claim 1, wherein the metallic conductive layer (10) is a metal layer selected from the group of metals containing aluminium, copper, aluminium-copper alloy, silver, gold, tin, chromium, iron, molybdenum, niobium, nickel, nickel-chromium alloy, palladium, platinum, silicon, tantalum, titanium and stainless steel.

3. The Electrically conductive multi-layer material (1) according to claim 1, wherein the electrically conductive carbon particles (6) are selected from the group of electrically conductive carbons containing carbon black, graphite and carbon nanotubes.

4. The Electrically conductive multi-layer material (1) according to claim 1, wherein the binding agent (4) is a vinyl polymer, preferably polyvinyl acetate (PVA).

5. The Electrically conductive multi-layer material (1) according to claim 1, wherein the fire retardant compound (5) is organozinc compound.

6. The Electrically conductive multi-layer material (1) according to claim 1, wherein the metallic electrically conductive layer (10) is coated from both sides with a corrosive resistant layer (11), such as nickel or zinc layer (11).

7. The Electrically conductive multi-layer material (1) according to claim 1, wherein said multi-layer material (1) comprises the woven glass fibre web (2) which comprises the polyvinyl acetate (PVA) (4) and the organozinc compound (5), and is impregnated with the electrically conductive carbon black particles (6), wherein said one side of the glass fibre web (2) is coated with the aluminium layer (10) by the means of thermal evaporation, and wherein said aluminium layer (10) is coated from both sides with the nickel layer (11).

8. The Electrically conductive multi-layer material (1) according to claim 1, wherein the glass fibre web (2) is coated with the metallic electrically conductive layer (10) by the means of thermal evaporation or sputtering.

9. Method for manufacture of an electrically conductive multi-layer material (1) according to claim 1, wherein the method comprises the following steps: a) providing a woven glass fibre web (2) which comprises a binding agent (4) and a fire retardant agent (5); b) impregnating the woven glass fibre web (2) with electrically conductive carbon particles (6); c) coating of impregnated woven glass fibre web (2) with metallic electrically conductive layer (10) by means of vacuum deposition.

10. The Method according to claim 9, wherein before the step c) the impregnated woven glass fibre web (2) is coated with a nickel layer (11) by means of vacuum deposition and after the step c) the coated woven glass fibre web (2) is again coated with a nickel layer (11) by means of vacuum deposition.

11. The Method according to claim 10, wherein as the vacuum deposition is thermal evaporation or sputtering.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following disclosure will be better understood by a person skilled in the art when read in conjunction with the figures.

[0020] FIG. 1 illustrates a cross-section of electrically conductive layer.

[0021] FIG. 2 illustrates a cross-section of electrically conductive layer further comprising nickel layers.

[0022] FIG. 3 shows a perspective view of insulated roof structure, where it has a cut-out to illustrate all the elements of the example roof structure.

[0023] Preferred embodiment of the invention is an electrically conductive multi-layer material 1 (see FIG. 1) comprises the woven glass fibre web 2, which comprises a polyvinyl acetate (PVA) 4 (shown under the symboltrianglein the FIGS. 1 and 2) as a binding agent 4 and an organozinc compound 5 (shown under the symbol rectangular in the FIGS. 1 and 2) as a fire retardant compound 5, and is impregnated with electrically conductive carbon black particles 6 (shown under the symbolsmall linesin the FIGS. 1 and 2) as an electrically conductive carbon particles 6. Said glass fibre web 2 is made of many glass fibres 3 woven on a warp and a weft. One side of the glass fibre web 2 is coated with an aluminium layer 10 by the means of thermal evaporation, creating aluminium coating.

[0024] Another embodiment further comprises a corrosive resistant layer 11 (see FIG. 2). The aluminium layer 10 is coated from both sides with a nickel layer 11.

[0025] In use, the electrically conductive multi-layer material 1 is laid on a roof structure. Said example of the roof structure comprises a bearing structure 40, covered by vapour barrier 41, which is subsequently covered by insulation layers 42, 43, 44. The insulation layers are an insulation base layer 42, an insulation slope forming layer 43 and an insulation surface layer 44. The electrically conductive multi-layer material 1 is laid above said insulation surface layer 44. The roof structure is sealed by a water insulation layer 20. Additionally the roof structure is provided with contact devices 30. These contact devices 30 are configured to provide an electric contact between the electrically conductive multi-layer material 1 and sealing inspection device (not shown in figure) to used for leak detection applications.

[0026] Another embodiment is possible where the electrically conductive multi-layer material 1 is used in wall structures of the building for implementing the leak detection applications.

[0027] In another embodiment of electrically conductive multi-layer material it comprises the woven glass fibre web 2, which comprises the polyvinyl acetate (PVA) 4 and the organozinc compound 5, and is impregnated with the electrically conductive carbon black particles 6, wherein said one side of the glass fibre web 2 is coated with the stainless steel layer 10 by the means of vacuum deposition. Additionally, said stainless steel or steel layer 10 is coated from one or both sides with the nickel layer 11.

[0028] While the inventions have been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. Therefore, it is intended that the inventions not be limited to the particular embodiments disclosed herein.