EP4261852A1 - Material zur lokalen verstärkung oder wiederherstellung der feuerbeständigkeit von elektrischen kabeln - Google Patents

Material zur lokalen verstärkung oder wiederherstellung der feuerbeständigkeit von elektrischen kabeln Download PDF

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Publication number
EP4261852A1
EP4261852A1 EP23167207.2A EP23167207A EP4261852A1 EP 4261852 A1 EP4261852 A1 EP 4261852A1 EP 23167207 A EP23167207 A EP 23167207A EP 4261852 A1 EP4261852 A1 EP 4261852A1
Authority
EP
European Patent Office
Prior art keywords
cable
approximately
geopolymer
fibrous material
geopolymer composition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23167207.2A
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English (en)
French (fr)
Inventor
Franck Gyppaz
Thierry Auvray
Vincent BLANC
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nexans SA
Original Assignee
Nexans SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nexans SA filed Critical Nexans SA
Publication of EP4261852A1 publication Critical patent/EP4261852A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame

Definitions

  • the present invention relates to the field of wires and cables having fire resistance capabilities.
  • Cables with this capacity called “fire resistant” are intended to be used in electrical devices whose electrical integrity is maintained under the conditions of a fire: they continue to perform their role even when they are subjected to at high temperature.
  • This type of fire-resistant cable generally has good performance in reaction to fire, with interesting properties of non-propagation of fire and non-production of smoke.
  • the fire resistance capabilities of a cable can be quantified in particular according to the standardized tests of the NF C 32070 category CR1, EN 50200, IEC 60331-1, or IEC60331-2 standards.
  • the invention more precisely makes it possible to protect, reinforce or restore the fire resistance capabilities of an electrical cable provided with a protective layer intended to provide it with such capabilities.
  • the invention aims to restore the performance of fire-resistant cables when their protective layer intended to ensure fire resistance is damaged.
  • the invention can be used preventively to prevent such damage to a cable area or more generally to increase at least locally the fire resistance capabilities of an electric cable.
  • the invention typically applies, but not exclusively, to cables intended for the transport of energy such as fire-resistant electrical safety cables, in particular halogen-free, capable of operating for a given period of time under conditions of fire.
  • the invention is also well suited for cables intended to prevent the spread of fire or the generation of smoke.
  • the cables used in the context of the invention can in particular be low or medium voltage energy transmission cables and in particular for voltages below 30 kV.
  • the invention is also suitable for information transport cables and cables comprising optical fibers.
  • the protective layers that are used to prevent ignition of this type of flammable material can vary quite widely. These protective layers have the common effect that they make it possible to inhibit, or at least to reduce in a more or less pronounced manner, the ignition of the flammable material when the protective layer is interposed between the material to be protected and the source of the flammable material. 'fire.
  • Effective protective layers are notably used in so-called “LFHC” wires and cables (for English: “Low Fire Hazard Cables”) which include, for example, polymer materials including flame-retardant fillers. More specifically, it has been described, in particular in the application EP 3 670 471 , the use of particularly effective layers based on geopolymers.
  • the protective materials which ensure the fire-resistant effect may be damaged locally, for example under the effect of shocks. , mechanical stress or friction, which leads to the appearance of weaknesses in the protective layer (crack, fragility, reduced thickness for example) and therefore reduces the overall fire resistance effect of the cable.
  • An aim of the present invention is to make it possible to restore the fire resistance properties of such a damaged cable.
  • the invention aims to provide products and methods making it possible to locally improve the fire protection effect of a cable to ensure said cable has increased fire resistance capabilities.
  • the present invention proposes to apply locally to the cable a fibrous material impregnated with a polymer composition, whereby a protective geopolymer coating is obtained locally on said cable, the inventors of which have now demonstrated that It improves the fire resistance properties of the cable.
  • the protective geopolymer coating restores at least identically (or even improving) the initial fire resistance properties of the cable.
  • the present invention relates to a method making it possible to improve the fire resistance properties of a cable which comprises at least one step (e1) in which one deposits, on only a portion of the outer surface of said cable, a fibrous material impregnated with geopolymer composition, whereby a fire-resistant composite coating is obtained on said portion of the outer surface of the treated cable.
  • the impregnated material is applied to a cable comprising a layer intended to ensure fire resistance but damaged locally with local fragilities (such as cracks or reduction in thickness in particular).
  • the fibrous material is deposited on only part of the cable but in such a way as to cover the fragilities of said damaged layer (for example on a crack in the cable or an area of lesser thickness).
  • the impregnated material is advantageously applied to a larger surface than just the surface in terms of fragility, typically by extending beyond this surface to ensure complete coverage without edge effect.
  • the method of the invention can be used more generally to locally reinforce the fire resistance properties of the cable, whether it is damaged or No.
  • the fibrous material can for example be deposited on a part of the cable intended to be subjected to higher temperature conditions than the rest of the cable (at an electrical cabinet or a connection for example). Again preferably overflowing a little to ensure complete coverage of the targeted area without edge effect.
  • the cable treated according to the invention generally comprises a layer of flammable material under a layer intended to ensure fire resistance.
  • flammable material means a material present in the cable, and which is, as such (i.e. when it is isolated outside the cable), likely to ignite when it comes into contact with a fire source.
  • the flammable material present cable treated according to the method of the invention may for example comprise at least one non-flame-retardant insulating or semi-conducting layer, preferably containing at least one thermoplastic polymer chosen from polyethylene (PE), polypropylene (PP) or polyvinyl chloride (PVC),
  • PE polyethylene
  • PP polypropylene
  • PVC polyvinyl chloride
  • step (e1) is advantageously, but not necessarily, followed by a step (e2) of hardening the polymer composition.
  • this step (e2) is carried out or not, we systematically obtain, simply because of the implementation of step (e1), a fire-resistant composite coating on a portion of the exterior surface of the cable.
  • the consolidation step (e2) has the advantage of ensuring better performance of the composite covering around the cable modified according to the process but it has no impact on the fire resistance properties themselves.
  • step (e1) is carried out by applying, around only a portion of the exterior surface of the cable, a ribbon comprising a fibrous material impregnated with geopolymer composition and forming at the same time Using this tape at least one closed ring around the cable.
  • the ribbon used in step (e1) comprises a continuous ribbon of fibrous material impregnated with geopolymer composition.
  • step (e2) is advantageously implemented at the end of step (e1) to ensure good retention of the ribbon around the cable.
  • the ribbon may be based on a continuous non-fibrous support and comprise several discontinuous zones of fibrous material impregnated with a geopolymer composition. In this case, the implementation of step (e2) remains advantageous but it is not strictly necessary
  • step (e1) is carried out by depositing a fire-resistant composite coating on the cable to be treated in an area which does not form a continuous ring around the cable.
  • the covering is advantageously secured to the cable using a layer of adhesive further outside the cable (i.e. further away from the axis of the cable than the covering carried out according to step (e1) and , if applicable, of step (e2) optional).
  • the adhesive layer then traps all or part of the covering between the cable and the adhesive.
  • the fibrous material used is previously deposited on a layer of adhesive of greater dimension than that of the fibrous material, thus schematically forming a sort of adhesive dressing which allows direct application to the cable, schematically in the same way that an impregnated dressing is applied to the skin in the medical field.
  • step (e2) is not generally implemented, the imprisonment of the geopolymer composition between the cable and the adhesive making this step difficult to carry out.
  • the geopolymer composition can be applied in the form of at least one small “patch” of dimensions smaller than the diameter of the cable, then an adhesive is applied to at least part of the patch overflowing on the cable, a bit like a compress fixed with adhesive tape to draw the same parallel with the medical field.
  • This embodiment is particularly well suited to ensuring localized and precise treatment of weak areas of the cable in terms of fire resistance and it makes it possible to limit the quantities of geopolymers and fibrous material used.
  • the method of the invention thus makes it possible, according to all its variants, to deposit an additional protective coating on the treated cable, for example in areas which are weakened or likely to become so, whereby the treated cable has increased resistance performance. to the fire in relation to the cable before the implementation of step (e1).
  • the present invention also relates to modified surface cables of the type obtained according to the method of the invention, which are modified at only part of their surface by a protective coating as obtained according to step (e1) and the optional subsequent step (e2).
  • the kit can for example include a bottle of geopolymer composition on the one hand and compresses to be impregnated on the other hand.
  • the kit may comprise a device containing (1) a sealed tank filled with geopolymer composition and (2) a reserve of ribbon of fibrous material, said tank being provided with an outlet connected to a nozzle or another means for delivering the geopolymer composition and the ribbon reserve unwinding the ribbon at this delivery means, whereby a ribbon impregnated with geopolymer composition, of desired length, is obtained, if necessary, by simple unwinding from the reserve on the desired length.
  • kits may optionally include, in addition to the impregnated material, an adhesive film to be applied on the one hand to all or part of said covering and on the other hand to part of the external surface of the cable, to
  • a geopolymer composition is used in impregnated form on a fibrous material.
  • Step (e1) also makes it possible to control the quantity of composition applied, by ensuring a sufficient deposit of material to obtain the expected protective effect and by limiting this application to the minimum necessary, particularly with a view to limiting costs.
  • the geopolymer composition of step (e1) is capable of forming, by progressive solidification ("setting") a geopolymer material (designated more concisely by “geopolymer” in the present description) from the impregnated geopolymer composition used in step (e1).
  • this solidification step which induces the transformation of the geopolymer composition into geopolymer material is sometimes referred to as the "drying" step, although the formation of the geopolymer from the geopolymer composition involves processes that are more complex than simple drying and which lead more to the formation of a material as such (geopolymer) rather than to a simple elimination of water.
  • step (e1) The compositions and materials that can be used in step (e1) are described in more detail below.
  • the fibrous material which is impregnated with the geopolymer composition in step (e1) is preferably a non-woven fiber material. Whether non-woven or not, it advantageously has a soft and flexible structure.
  • This fibrous material typically non-woven, may in particular be chosen from cellulosic materials, materials based on synthetic organic polymers, glass fibers, and one of their mixtures, and preferably from materials based on synthetic organic polymers.
  • Cellulosic materials can be chosen from paper, in particular blotting paper; non-woven materials made from functionalized or non-functionalized cellulose; structure matrices alveolar and/or fibrous made from natural cellulose acetate fibers.
  • the materials based on synthetic organic polymers can be chosen from polymer materials with a porous and/or fibrous polyolefin(s) matrix, in particular those chosen from propylene homo- and copolymers, ethylene homo- and copolymers, high density polyethylenes (HDPE), aromatic polyamides (aramids), polyesters, and one of their mixtures.
  • polymer materials with a porous and/or fibrous polyolefin(s) matrix in particular those chosen from propylene homo- and copolymers, ethylene homo- and copolymers, high density polyethylenes (HDPE), aromatic polyamides (aramids), polyesters, and one of their mixtures.
  • the non-woven fibrous material is a polyethylene terephthalate (PET).
  • the non-woven fibrous material preferably has a weight ranging from approximately 50 to 120 g/cm 2 . This makes it possible to obtain a composite layer that is sufficiently flexible to be able to be handled easily, and sufficiently robust to obtain good fire protection.
  • This composite layer obtained by impregnation of the fibrous material with the geopolymer composition in the device of the invention then hardening of the composition inducing the formation of a geopolymer material entangled in the fibers of the fibrous material, generally constitutes a continuous layer , typically non-porous, on the surface of the cable core, suitable for being subsequently coated with other coating layers or with an adhesive.
  • this composite layer has a substantially constant thickness, this thickness generally has a value typically ranging from approximately 0.2 to 3 mm, for example from 0.5 to 1 mm. approximately.
  • the geopolymer material represents approximately 5 to 98% by weight, preferably approximately 55 to 95% by weight, and more preferably approximately 65 to 90% by weight, relative to the total weight of the composite layer. carried out using the device of the invention.
  • the non-woven fibrous material generally represents approximately 2 to 95% by weight, particularly preferably approximately 5 to 45% by weight, and even more preferably approximately 10 to 35% by weight, relative to the weight. total of the composite layer produced using the device of the invention.
  • step (e) uses a geopolymer composition
  • it is preferably a liquid geopolymer composition.
  • a composition of relatively low viscosity preferably less than 5 Pa.s.
  • a geopolymer composition employed in step (e) is preferably an aluminosilicate geopolymer composition.
  • a geopolymer composition used in step (e) comprises water, silicon (Si), aluminum (AI), oxygen (O), and at least one element chosen from potassium (K), sodium (Na), lithium (Li), cesium (Cs), and calcium (Ca), and preferably chosen from potassium (K) and sodium (Na).
  • This geopolymer composition may in particular comprise at least one first aluminosilicate, at least one first alkaline silicate, water, and optionally an alkaline base.
  • the first aluminosilicate can be chosen from metakaolins (ie calcined kaolins), fly ash (well known as “ fly ash ”), blast furnace slag (well known as “ blast fumace slag ”), swelling clays such as bentonite, calcined clays, any type of compound comprising aluminum and silica fume, zeolites, and one of their mixtures.
  • metakaolins ie calcined kaolins
  • fly ash well known as “ fly ash ”
  • blast furnace slag well known as “ blast fumace slag ”
  • swelling clays such as bentonite, calcined clays, any type of compound comprising aluminum and silica fume, zeolites, and one of their mixtures.
  • metakaolins are preferred, in particular those marketed by the company Imérys.
  • metalakaolin means a calcined kaolin or a dehydroxylated aluminosilicate. It is preferably obtained by dehydration of a kaolin or a kaolinite.
  • the geopolymer composition may comprise from approximately 5 to 50% by weight of aluminosilicate, and preferably from approximately 10 to 35% by weight of aluminosilicate, relative to the total weight of the geopolymer composition.
  • the geopolymer composition may further comprise a second aluminosilicate different from the first aluminosilicate.
  • the geopolymer composition comprises two calcined kaolins having different calcination temperatures.
  • the geopolymer composition comprises a first metakaolin chosen from kaolins calcined at a temperature T c1 of at least approximately 650°C, and a second metakaolin chosen from kaolins calcined at a temperature T c2 such that T c2 - T c1 ⁇ approximately 100°C, at least a first alkaline silicate, water, and optionally an alkaline base.
  • the geopolymer composition can then have improved mechanical properties, particularly in terms of flexibility and durability, while guaranteeing good reaction and fire resistance properties.
  • the first metakaolin is a kaolin calcined at a temperature T c1 of at least approximately 700°C, and preferably at least approximately 725°C.
  • the first metakaolin is a kaolin calcined at a temperature T c1 of at most approximately 875°C, and preferably at most approximately 825°C.
  • the first metakaolin may comprise at most approximately 60 mol%, and preferably at most approximately 50 mol%, of aluminum oxide (Al 2 O 3 ), relative to the total number of moles of the first metakaolin.
  • the first metakaolin may comprise at least approximately 35 mol%, and preferably at least approximately 45 mol%, of silicon oxide (SiO 2 ), relative to the total number of moles of the first metakaolin.
  • the first metakaolin may comprise at most approximately 75 mole%, and preferably at most approximately 65 mole%, of silicon oxide (SiO 2 ), relative to the total number of moles of the first metakaolin.
  • the metakaolins sold by the company Imérys, in particular that marketed under the reference PoleStar ® 450.
  • the first metakaolin can be chosen from kaolins calcined at T c1 as defined in the invention, for at least approximately 1 min, preferably for at least approximately 10 min, particularly preferably for a duration ranging from approximately 30 min to 8 a.m., and more particularly preferably for a period ranging from approximately 2 hours to 6 hours.
  • the second metakaolin is preferably chosen from kaolins calcined at a temperature T c2 such that T c2 - T c1 ⁇ approximately 150°C, in a particularly preferred manner such that T c2 - T c1 ⁇ approximately 200°C, and more preferably particularly preferred such that T c2 - T c1 ⁇ approximately 250°C.
  • the second metakaolin is a kaolin calcined at a temperature T c2 of at least approximately 800°C, preferably at least approximately 850°C, and particularly preferably at least approximately 850°C. minus approximately 900°C.
  • the second metakaolin is a kaolin calcined at a temperature T c2 of at most approximately 1200°C, and preferably at most approximately 1150°C.
  • the second metakaolin may comprise at least approximately 20 mol%, and preferably at least approximately 30 mol% of oxide. of aluminum (Al 2 O 3 ), relative to the total number of moles of the second metakaolin.
  • the second metakaolin may comprise at most approximately 60 mol%, and preferably at most approximately 50 mol%, of aluminum oxide (Al 2 O 3 ), relative to the total number of moles of the second metakaolin.
  • the second metakaolin may comprise at least approximately 35 mol%, and preferably at least approximately 45 mol%, of silicon oxide (SiO 2 ), relative to the total number of moles of the second metakaolin.
  • the second metakaolin may comprise at most approximately 75 mol%, and preferably at most approximately 65 mol%, of silicon oxide (SiO 2 ), relative to the total number of moles of the second metakaolin.
  • second metakaolin we can cite the metakaolins sold by the company Imérys, in particular that marketed under the reference PoleStar ® 200R.
  • the second metakaolin can be chosen from kaolins calcined at T c2 as defined in the invention, for at least approximately 1 min, preferably for at least approximately 5 min, particularly preferably for a duration ranging from approximately 10 min to 2 hours, and more particularly preferably for a period ranging from approximately 15 minutes to 1 hour.
  • the mass ratio [first metakaolin/second metakaolin] in the geopolymer composition preferably ranges from approximately 0.1 to 2, particularly preferably from approximately 0.5 to 1.0, and more particularly preferably is approximately 1 .
  • the first alkaline silicate can be chosen from sodium silicates, potassium silicates, and one of their mixtures.
  • Alkaline silicates marketed by the company Silmaco or by the company PQ corporation are preferred.
  • the first alkaline silicate is preferably a sodium silicate.
  • the first alkali silicate may have a SiO 2 /M 2 O molar ratio ranging from approximately 1.1 to 35, preferably from approximately 1.3 to 10, and particularly preferably from approximately 1.4 to 5, with M being a sodium or potassium atom, and preferably a sodium atom.
  • the geopolymer composition may further comprise a second alkali silicate different from the first alkali silicate.
  • the second alkaline silicate can be chosen from sodium silicates, potassium silicates, and one of their mixtures. Alkaline silicates marketed by the company Silmaco or by the company PQ Corporation are preferred. The second alkali silicate is preferably a sodium silicate.
  • the first and second alkali silicates can respectively have molar ratios SiO 2 /M 2 O and SiO 2 /M' 2 O such that M and M', identical, are chosen from a sodium atom and a potassium atom, and from preferably a sodium atom, and said ratios have different values, preferably values such that their difference is at least 0.3, particularly preferably such that their difference is at least 0.5, and more particularly preferred way such that their difference is at least 1.0.
  • the geopolymer composition may comprise approximately 10 to 60% by weight, and preferably approximately 20 to 50% by weight, of first and second alkali silicates, relative to the total weight of the geopolymer composition.
  • the mass ratio [first alkali silicate/second alkali silicate] in the geopolymer composition preferably ranges from 0.5 to 2.5, and particularly preferably from 0.8 to 2.0.
  • the alkaline base (optional)
  • the alkaline base may be sodium hydroxide, or potassium hydroxide, and preferably sodium hydroxide.
  • the geopolymer composition may be free of alkaline base. This thus makes it possible to improve the handling of the geopolymer composition, in particular during the preparation of a cable.
  • the solids/water mass ratio in said geopolymer composition determines the solidification kinetics during steps i) to iii).
  • the geopolymer composition can comprise from approximately 35% to 80% by weight, and particularly preferably from approximately 40% to 70% by weight, of solid materials (alkaline silicate(s), aluminosilicate(s) and alkaline base), for example relative to the total weight of said geopolymer composition.
  • the geopolymer composition may comprise from approximately 0.01 to 15% by weight of additive(s), and preferably from approximately 0.5 to 8% by weight of additive(s), relative to the total weight of the composition. geopolymer.
  • a geopolymer material is obtained around the flexible elongated conductive element when the composition used in step (e) is a geopolymer composition.
  • the geopolymer is preferably obtained by hardening, geopolymerization and/or polycondensation of said geopolymer composition.
  • the geopolymer composition as defined in the invention is capable of forming said geopolymer material.
  • the ingredients of the geopolymer composition can therefore undergo polycondensation to form said geopolymer material. Hardening takes place by internal reaction of the polycondensation type.
  • Geopolymer materials result from a mineral polycondensation reaction by alkaline activation, called geosynthesis, as opposed to traditional hydraulic binders in which hardening is the result of hydration of calcium aluminates and calcium silicates.
  • the expression “geopolymer material” designates a solid material comprising silicon (Si), aluminum (AI), oxygen (O) and at least one element chosen from potassium (K) , sodium (Na), lithium (Li), cesium (Cs) and calcium (Ca), and preferably chosen from potassium (K), and sodium (Na).
  • the geopolymer material may be an aluminosilicate geopolymer material.
  • the aluminosilicate geopolymer material can be chosen from poly(sialates) corresponding to the formula (I) M n (-Si-O-Al-O-) n [(M)-PS] and having an equal Si/AI molar ratio to 1, poly(sialate-siloxos) corresponding to formula (II) M n (-Si-O-Al-O-Si-O-) n [(M)-PPS] and having a Si/AI molar ratio equal to 2, poly(sialate-disiloxos) corresponding to formula (III) M n (-Si-O-Al-O-Si-O-Si-O) n [(M)-PSDS] and having a ratio molar Si/AI equal to 3, and others poly(sialates) with a Si/Al ratio > 3, the aforementioned poly(sialates) comprising an alkaline cation M chosen from K, Na, Li,
  • the geopolymer material represents approximately 5 to 98% by weight, preferably approximately 55 to 95% by weight, and more preferably approximately 65 to 90% by weight, relative to the total weight of the composite layer.
  • the method may further comprise, before step (e), a step (e 0 ) of preparing the geopolymer composition comprising mixing said first aluminosilicate with said first alkaline silicate, water, and optionally the alkaline base.
  • Step (e 0 ) is generally carried out at a high pH, in particular varying from 10 to 13.
  • the aqueous solution of the first alkali silicate can be prepared by mixing silicon dioxide SiO 2 or an alkali silicate with an MOH base in which M is K or Na.
  • the silicon dioxide SiO 2 can be chosen from silica fume (ie fumed silica), quartz, and mixtures thereof.
  • the substep (e 0-1 ) can be carried out by dissolving the base in water, resulting in the release of heat (exothermic reaction), then adding the silica (or alkali silicate). The heat released then accelerates the dissolution of the silica (or alkali silicate) during sub-step i 01 ), and of the first aluminosilicate during sub-step (e 0-2 ).
  • the step (e 0 ) of preparing the geopolymer composition may comprise the mixture of said first aluminosilicate and optionally of said second aluminosilicate, with said first alkali silicate, optionally said second alkali silicate, water, and optionally the alkaline base.
  • Step (e 0 ) preferably comprises mixing the first and second metakaolins, with the first alkaline silicate and optionally the second alkaline silicate, water, and optionally an alkaline base.
  • the first and second metakaolins and the first and second alkali silicates are as defined in the invention.
  • a fluid and homogeneous solution is preferably obtained.
  • the geopolymer composition can comprise from approximately 35% to 80% by weight, and particularly preferably from approximately 40% to 70% by weight, of solid materials (alkaline silicate ( s), aluminosilicate(s) and alkaline base), relative to the total weight of said geopolymer composition.
  • Such a mass ratio makes it possible to have a geopolymer composition that is fluid enough to allow its handling, and whose solidification kinetics are slow enough to allow the formation of a layer during step (e1).
  • the solid material/water mass ratio in said geopolymer composition can make it possible to determine the solidification kinetics of said geopolymer composition.
  • step (e 0 ) of preparing the geopolymer composition and before step (e1), the geopolymer composition can be heated, in particular to a temperature ranging from approximately 55°C to 95°C, and in a particularly preferred from approximately 70°C to 90°C. This makes it possible to facilitate step (e1).
  • the flammable material protected by the coating carried out in step (e1) which can advantageously be the constituent material of at least one electrically insulating or semi-conducting layer of the cable, is, according to an interesting embodiment, a polymer material flammable.
  • the flammable material generally does not contain a flame retardant compound.
  • it generally does not contain a flame-retardant filler, and in particular no hydrated flame-retardant mineral filler such as a magnesium hydroxide or an aluminum trihydroxide.
  • the flammable material may, however, contain other types of filler, in particular an inert filler, in particular chosen from talc, micas, dehydrated clays and one of their mixtures.
  • an inert filler in particular chosen from talc, micas, dehydrated clays and one of their mixtures.

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  • Compositions Of Macromolecular Compounds (AREA)
EP23167207.2A 2022-04-13 2023-04-07 Material zur lokalen verstärkung oder wiederherstellung der feuerbeständigkeit von elektrischen kabeln Pending EP4261852A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2203427A FR3134647A1 (fr) 2022-04-13 2022-04-13 matériau pour le renforcement local ou la restauration de la résistance au feu de câbles électriques

Publications (1)

Publication Number Publication Date
EP4261852A1 true EP4261852A1 (de) 2023-10-18

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EP23167207.2A Pending EP4261852A1 (de) 2022-04-13 2023-04-07 Material zur lokalen verstärkung oder wiederherstellung der feuerbeständigkeit von elektrischen kabeln

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FR (1) FR3134647A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3640956A1 (de) * 2018-10-18 2020-04-22 Nexans Füllschicht für niederspannungskabel mit verbessertem brandschutz
EP3670471A1 (de) 2018-12-21 2020-06-24 Nexans Feuerbeständige geopolymer-zusammensetzung, insbesondere für eine vorrichtung, die ein kabel oder ein zubehörteil für kabel umfasst
EP3754671A1 (de) * 2019-06-20 2020-12-23 Nexans Verfahren zur herstellung eines feuerbeständigen und/oder feuerhemmenden kabels
FR3109014A1 (fr) * 2020-04-06 2021-10-08 Nexans Procédé de fabrication d’un câble résistant et/ou retardant au feu
FR3111648A1 (fr) * 2020-06-19 2021-12-24 Nexans Procédé de fabrication d’un câble résistant et/ou retardant au feu

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3640956A1 (de) * 2018-10-18 2020-04-22 Nexans Füllschicht für niederspannungskabel mit verbessertem brandschutz
EP3670471A1 (de) 2018-12-21 2020-06-24 Nexans Feuerbeständige geopolymer-zusammensetzung, insbesondere für eine vorrichtung, die ein kabel oder ein zubehörteil für kabel umfasst
EP3754671A1 (de) * 2019-06-20 2020-12-23 Nexans Verfahren zur herstellung eines feuerbeständigen und/oder feuerhemmenden kabels
FR3109014A1 (fr) * 2020-04-06 2021-10-08 Nexans Procédé de fabrication d’un câble résistant et/ou retardant au feu
FR3111648A1 (fr) * 2020-06-19 2021-12-24 Nexans Procédé de fabrication d’un câble résistant et/ou retardant au feu

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