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Title:
AN ELECTRICALLY CONDUCTIVE MULTI-LAYER MATERIAL FOR LEAK DETECTION APPLICATION
Document Type and Number:
WIPO Patent Application WO/2018/096389
Kind Code:
A1
Abstract:
The invention relates to electrically conductive multi-layer materials for leak detection applications. The conductive multilayer materials are especially suitable for water tightness inspections on roofs and other leak proof structures. Electrically conductive multi-layer material (1) for applying it under a non-conductive water insulation layer comprises a nonwoven PET (Polyethylene terephthalate) or PP (Polypropylene) polymer layer (2) and a conductive particle coating (3) which comprises electrically conductive carbon and/or metal particles (4) and a binding agent (5). The invention further relates to the method of manufacture of said electrically conductive multi-layer materials as well as the use thereof.

Inventors:
DRAUDINS, Kristaps (Ainavas iela 10, Priedkalne, Garkalnes novads, LV-1024, LV)
SENHOFS, Karlis (Uzvaras iela 2, Ikskile, Ikskiles novads, LV-5052, LV)
LIEDE, Armands (Strautu iela 44, Riga, LV-1073, LV)
STANKEVICS, Eriks (Jupitera iela 7-1, Ramava, Kekavas novads, LV-2111, LV)
Application Number:
IB2016/057121
Publication Date:
May 31, 2018
Filing Date:
November 25, 2016
Export Citation:
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Assignee:
DRAUDINS, Kristaps (Ainavas iela 10, Priedkalne, Garkalnes novads, LV-1024, LV)
SENHOFS, Karlis (Uzvaras iela 2, Ikskile, Ikskiles novads, LV-5052, LV)
LIEDE, Armands (Strautu iela 44, Riga, LV-1073, LV)
STANKEVICS, Eriks (Jupitera iela 7-1, Ramava, Kekavas novads, LV-2111, LV)
International Classes:
E04D1/28; B32B5/00; D04H13/00; D06N7/00; G01M3/16
Domestic Patent References:
WO2013062836A12013-05-02
Foreign References:
EP2309046A12011-04-13
US5850144A1998-12-15
EP2488361B12014-07-09
Attorney, Agent or Firm:
KROMANIS, Artis (PETERSONA PATENTS, Ausekla 2-2, Riga, LV-1010, LV)
Download PDF:
Claims:
CLAIMS

Electrically conductive multi-layer material (1) for applying it under a non-conductive water insulation layer, comprising a nonwoven PET (Polyethylene terephthalate) or PP (Polypropylene) polymer layer (2) and a conductive particle coating (3) which comprises electrically conductive carbon and/or metal particles (4) and a binding agent (5).

Electrically conductive multi-layer material (1) according to claim 1, wherein fibres of the nonwoven PET or PP polymer layer are in the range of 0.9 dtex to 16.0 dtex, preferably 1.7 dtex to 6.0 dtex.

Electrically conductive multi-layer material (1) according to claim 1 or 2, wherein the metal particles (4) are metal particles 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.

Electrically conductive multi-layer material (1) according to claim 1 or 2, wherein the electrically conductive carbon particles (4) are selected from the group of electrically conductive carbons comprising a carbon black, a graphite and carbon nanotubes.

Electrically conductive multi-layer material (1) according to claim 1 or 2, wherein the binding agent (5) is a polymer or a co-polymer matrix.

Electrically conductive multi-layer material (1) according to claim 3 or 4, wherein the particle size of carbon and metal particles is in range of 2 to 200 μπι, preferably from 10 to 30 μπι.

Electrically conductive multi-layer material (1) according to any of claims, wherein a nonwoven PET or PP polymer layer (2) is coated with the conductive particle coating (3) in such a way that said coating (3) can be on one or both sides of the layer (2) or penetrated within the layer (2).

8. Electrically conductive multi-layer material (1) according to any of claims, wherein said material (1) is attached to a hydro-isolation PVC (polyvinyl chloride) material sheet (10).

9. Electrically conductive multi-layer material (1) according to any of claims, wherein an amount of conductive particle coating (3) in weight % on polymer nonwoven layer is in range from 1% to 50%, preferably from 10% to 20%.

10. Method of manufacture an electrically conductive multi-layer material (1) according to any one of claims 1 to 7, wherein the method comprises the following steps:

a) providing of a nonwoven PET or PP polymer layer (2);

b) providing of a conductive particle coating (3) which comprises electrically conductive carbon or metal particles (4) and a binding agent (5).

c) coating of the nonwoven PET or PP polymer layer (2) with the conductive particle coating (3).

11. Method according to claim 10, wherein the coating of the nonwoven PET (Polyethylene terephthalate) or PP (Polypropylene) polymer layer (2) is performed by the technological process which is selected from the following group of the technological processes: direct coating; foam coating; rolling; transferring; spraying; rotary screening; curtain or slot die coating or dipping, preferably using direct or foam coating.

Description:
AN ELECTRICALLY CONDUCTIVE MULTI-LAYER MATERIAL FOR LEAK

DETECTION APPLICATION

Technical Field

The invention relates to electrically conductive multi-layer materials for leak detection applications. The conductive multilayer materials are especially suitable for water tightness inspections on roofs and other leak proof structures. The invention further relates to the method of manufacture of said electrically conductive multi-layer materials as well as the use thereof.

Background Art

Because the purpose of a roof or other leak proof structures is to protect people and their possessions from climatic elements, the insulating properties of the roof or other leak proof structures are a consideration. It is necessary to provide a means to control its water tightness. Several number of methods and devices have been developed, unfortunately none of them is significantly accurate, effective or resistant up to date. For example, a late detection and location of the roof seal damage can cause considerable damage to the overall roof staicture and even to the building itself. Therefore, it is necessary to develop such a sealing, which implements precise and effective leak detection applications and in the mean time is resistant to environment and mechanical damages.

European patent No. EP2488361 discloses a method for producing a multilayer sealing structure comprising an electrically conductive inner layer made of asphalt sheets, and asphalt sheets for such a sealing structure.

German patent No. DE19638733 discloses plastic seal damage detection method.

United States patent No. US5362182 discloses a waste disposal landfill having subsurface impermeable sheets, which can be monitored with respect to their permeability.

United states patent No. US5850144 discloses a leak testable, fluid impervious membrane formed as a laminate of a conductive mesh scrim between upper and lower insulated polymeric resin layers. United States patent No. US8604799 discloses a structural seal with electrically conductive layer which is arranged inside or outside structural seal and extends over substantially the entire surface of the structural seal.

German patent application No. DE10036362 discloses a system for location of leaks from sealed building structures, e.g. flat roofs, has an electrically conductive layer beneath the sealant layer and an outer electrode within which the voltage distribution is measured. The drawback of the above-mentioned multilayer materials comprising electrically conductive layers are their complicated installation in structures to be sealed. They are subject to delamination, which decrease its measurement accuracy and effectiveness. More complicated installation leads to increased costs. Additionally, state of art conductive layers do not provide effective conductivity properties overall and on separate points in the sealed structure. Therefore, the aim of the invention is to create a conductive layer with increased conductivity properties and easier installation in structures to be sealed as well as with increased mechanical properties.

Summary of the Invention

The aim of the invention is reached by design of electrically conductive multi-layer material for applying it under a non-conductive water insulation layer, for example PVC (polyvinyl chloride) material sheet. The multi-layer material is characterized in that it comprises a nonwoven PET (Polyethylene terephthalate) or PP (Polypropylene) polymer layer and a conductive particle coating and a binding agent. The conductive particle coating comprises electrically conductive carbon and/or metal particles. The conductive particle coating can be in the form of a paste or a foam. In another embodiment the nonwoven polymer layer can be soaked or doped with conductive particles compound which comprises electrically conductive carbon and/or metal particles as well as a binding agent.

The paste or foam conductive particle coating can be a water based solution of particles homogenously distributed. Aperture solution can physically have a paste or a foam physical properties with any viscosity appropriate for the application device. Applying temperature can be from 10°C-30°C, preferably at room temperature. The binding agent can be a polymer or a co-polymer matrix. The nonwoven PET or PP polymer layer preferably is coated with paste or foam conductive particle coating by the means of direct or foam coating.

The fibres of the nonwoven PET or PP polymer layer can be in the range of 0.9 dtex to 16 dtex, preferably 1.7 dtex to 6 dtex. Said fibres can be in the form of yarns and thread.

The metal particles in conductive particle coating can be metal particles 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/or stainless steel. The conductive particle coating can be a combination of variety of metal with a combination of carbon particles in graphene as single layered particles or graphite in multi-layered form. In some embodiments the conductive particle coating can be a combination of carbon and metal particles in any combination.

Metal or carbon particle sizes can vary from 2 to 200 μπι, preferably from 10 to30 μπι. An amount of a paste has to fulfil the material specialized characteristics, namely surface resistance has to be lower than 10 3 Ω. A dry cover paste itself has usually a resistance lower than 10 Ω. The conductive layer can be form one or on both sides of the nonwoven layer, or penetrated or impregnated through the nonwoven layer. The amount of conductive material or particles in weight percentage (weight%) on polymer nonwoven layer is normally from l%-50%, preferably from 10%-20%. The electrically conductive carbon particles are selected from the group of electrically conductive carbons comprising a carbon black, a graphite and/or carbon nanotubes.

The invention also includes a method for manufacture of said electrically conductive multilayer material, wherein the method comprises the following steps:

a) providing of a nonwoven PET or PP polymer layer;

b) providing of paste or foam conductive particle coating which comprises electrically conductive carbon or metal particles and a binding agent.

c) coating of the nonwoven PET or PP polymer layer with the paste or foam conductive particle coating. The method further includes a step of laying said multi -layer material onto the PVC (polyvinyl chloride) material sheet. The multi-layer material is laid onto the PVC material sheet by means of lamination.

The coating of the nonwoven PET or PP polymer layer is performed by the technological process which is selected from the following group of the technological processes: direct coating; foam coating; rolling; transferring; spraying; rotary screening; curtain or slot die coating or dipping, preferably using direct or foam coating.

The electrically conductive multi-layer material can be used in the leak detection applications for roof, wall or even tunnel structures or any other structure where precise and effective leak detection is necessary. Brief description of the drawings

The following disclosure will be better understood by a person skilled in the art when read in conjunction with the figures. Fig. 1 illustrates a cross-section of an electrically conductive multi -layer material 1.

Fig. 2 illustrates a fragment of electrically conductive multi-layer material 1 coated or laid on a PVC hydro-isolation material.

Fig. 3 illustrates a perspective view of insulated roof structure, where it has a cut-out to illustrate all elements of the exemplary roof structure.

Preferred embodiment of the invention is an electrically conductive multi-layer material 1 for applying it under a non-conductive water insulation layer 20. The electrically conductive multilayer material 1 comprises a nonwoven PET (Polyethylene terephthalate) polymer layer 2 and a conductive particle coating 3 which comprises electrically conductive carbon and metal particles 4 as well as a binding agent 5.

In another embodiment the nonwoven polymer layer 2 is soaked or doped with conductive particles compound 3 which comprises electrically conductive carbon and metal particles 4 as well as a binding agent 5. Another embodiment further comprises the electrically conductive multi-layer material 1 attached to a PVC layer 10 (see Fig. 2). Following combination provides ready to use electrically conductive multi-layer material which is ready to be laid on the roof structure or any other structure to be sealed and controlled for leaks.

In the roof structure the electrically conductive multi-layer material 1 is laid above insulation layers 42, 43 and 44, especially above an insulation surface layer 44 (Fig. 3). The roof structure comprises a bearing structure 40, covered by a vapour barrier 41, which is subsequently covered by insulation layers 42, 43, and 44. The insulation layers consist of an insulation base layer 42, an insulation slope forming layer 43 and an insulation surface layer 44. The roof structure is sealed by a water insulation layer 20, which is laid above said electrically conductive multilayer material 1. Said insulation layers 20 are connected to each other via connection points 21. 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 be used for leak detection applications.

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.