KR20170063930A - Anti-uv protection of a coloured cable sheath - Google Patents

Abstract

The invention relates to UV-resistant electrical and / or optical cables comprising at least one electrically insulating colored coating and at least one transparent layer surrounding the electrically insulating coating.

Description

ANTI-UV PROTECTION OF A COLORED CABLE SHEATH < RTI ID = 0.0 >

The present invention relates to electrical and / or optical cables resistant to UV rays comprising at least one colored electrically insulating coating and at least one transparent layer surrounding the electrically insulating coating.

The present invention is generally applicable, but not exclusively, to electrical and / or optical cables intended for power transmission and / or data transmission, and is particularly suitable for use in outdoor applications, for example, where the ultraviolet (UV) For example, in coastal areas, deserts, oceans, high mountains, and near equator). Electrical and / or optical cables generally comprise one or more elongated conductive element (s) of electrical and / or light type and an outer electrical insulation (s) surrounding the elongated conductive element Lt; / RTI > The outer electrically insulating coating may be colored to indicate to the user and / or the repairman what type of cable the cable is. When these cables are outdoors, they are subjected to high levels of UV radiation, which combine with atmospheric oxygen and other stresses (eg, water, high temperature, ozone, etc.) to prevent premature aging of the external electrically insulating coating . This is because polymeric materials (e.g., polyolefin, polyvinyl chloride) commonly used in external electrically insulating coatings are sensitive to oxidation and UV radiation. In addition, UV radiation photodecomposes colored additives (e.g., organic dyes) commonly used to color external electrically insulating coatings of cables. In particular, the pigmented material absorbs UV radiation to cause specific photochemical reactions, such as cleavage of the chain; The formation of double or triple ionic bonds of released electrons or often most of the free radicals; Removal of small molecules; Or crosslinking. This reaction is undesirable and irreversible in properties such as fading (i.e., no persistence of the initial colored appearance of the outer electrically insulating coating), surface cracking and deformation, changes in tensile strength and resistance to stretch, (Physical, mechanical, aesthetic, etc.) of the external electrically insulating coating and a reduction in service life.

Various solutions are currently available for protecting colored external electrically insulating coatings of cables from UV radiation.

The first solution is to include in the composition of the external electrically insulating coating of the cable one or more stabilizers, for example UV absorbers, the role of which is to capture UV radiation in place of the polymeric material and / or the colored material Is to convert the UV radiation into heat, which is then distributed over the surface of the electrically insulating coating. Currently the most widely used UV absorber is carbon black. The external electrically insulating coating thus obtained is black, and the carbon particles in the coating completely absorb the UV rays and convert the UV rays into heat energy. Sometimes locating strips of color are added to the exterior electrically insulating coating colored in black.

However, this solution is not possible to produce an external electrically insulative coating with a color other than black or to represent a position finding strip with a color over a color other than black.

US 5 355 427 provides the use of polyethylene based external electrically insulating coatings which exhibit an orange color resistant to UV radiation. However, the composition of this coating is not described.

Light stabilizers (i. E., UV stabilizers) can also be used for external electrically insulating coatings of cables. This light stabilizer does not absorb UV radiation like UV absorbers; On the one hand, this light stabilizer neutralizes the free radicals generated by the photochemical reaction, slowing the chemical degradation, thereby protecting the material present in the electrically insulating coating from the harmful effects of this free radical.

In general, however, by using stabilizers (UV absorbers, UV stabilizers) in the colored electrically insulating coatings, it is particularly advantageous when the free radicals are generated on the surface of the relatively ineffective coating, It is not possible to prevent the initial color in the color tone gradually disappearing or changing its color.

Another solution is to use a polymeric material, such as polycarbonate, acrylonitrile butadiene styrene, in the form of a gutter or pipe (e.g., duct for cable installation) surrounding at least a portion of the cable that is susceptible to exposure to UV radiation To produce a rigid protection system. This protection system is not an integral part of the cable. Also, with this type of protection system, additional manufacturing and installation costs are required because the protection system must be added around the cable. It is also necessary to be able to remove the protection system in order to see the color of the cable.

It is therefore an object of the present invention to provide a method and apparatus for power transmission and / or data transmission that can be used outdoors, especially at high UV radiation levels, while ensuring good color and good mechanical and electrical properties. To overcome the technical shortcomings of the prior art by providing colored electrical and / or optical cables.

The subject matter of the present invention is an electrical and / or optical cable comprising at least one elongated conductive element and a colored electrically insulating coating surrounding the elongated conductive element, Further comprising a transparent layer, wherein the transparent layer is in direct physical contact with the colored electrically insulating coating and comprises at least one polymer and at least one UV absorbing agent.

By surrounding this transparent layer with a colored electrically insulating coating of the electrical and / or optical cable of the present invention, the cable exhibits improved resistance to UV radiation and is used outside the building, And / or deterioration of softening and mechanical and electrical properties.

In the present invention, the expression "colored coating" means that the coating represents a color that can be visually identified by the user, installer or repairman of the cable comprising said coating. The color of the sheath of the cable depends generally on the type of cable used (e.g., safety cable, mid-voltage cable, etc.) and / or the supplier of the cable.

In the present invention, the expression "transparent layer" means that this layer can pass an electromagnetic wave having a wavelength corresponding to the visible light spectrum, i.e., a wavelength of about 380 to 780 nm.

This is because the user, installer or repairman of the cable must be able to visually identify the color of the sheath of the cable through the transparent layer.

Due to the presence of the UV absorber, the transparent layer is able to withstand UV radiation and protects the colored electrically insulating coating of the cable from UV radiation. The absorbent can avoid direct deterioration by avoiding direct use of the UV absorber on the colored electrically insulating coating of the cable which does not protect the outer surface of the cable.

The UV absorber is preferably selected from compounds comprising benzophenone (BP), benzotriazole (BTZ), hydroxyphenyl-s-triazine (HPT) and cyanoacrylate (CA) backbone.

81) 또는 2-히드록시-4-메톡시벤조페논 (Chimassorb

90)을 들 수 있다. Examples of compounds that include benzophenone (BP) backbones include, but are not limited to, methanone, [2-hydroxy-4- (octyloxy) phenyl]

81) or 2-hydroxy-4-methoxybenzophenone (Chimassorb

90).

234), 2-(2H-벤조트리아졸-2-일)-p-크레졸 (Tinuvin

P), 2'(2'-히드록시-3'-(tert-부틸)-5'-메틸페닐)-5-클로로벤조트리아졸 (Tinuvin

326), 2-(2'-히드록시-3',5'-디(tert-부틸)페닐)-5-클로로벤조트리아졸 (Tinuvin

327), 2-(2H-벤조트리아졸-2-일)-4,6-디(tert-펜틸)페놀 (Tinuvin

328), 2-(2H-벤조트리아졸-2-일)-4-(1,1,3,3-테트라메틸부틸)페놀 (Tinuvin

329) 또는 2,2'-메틸렌비스(6-(2H-벤조트리아졸-2-일)-4-(1,1,3,3-테트라메틸부틸)페놀) (Tinuvin

360)을 들 수 있다. Examples of compounds that include benzotriazole (BTZ) backbones include 2- (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-

234), 2- (2H-benzotriazol-2-yl) -p-cresol (Tinuvin

P), 2 '(2'-hydroxy-3'- (tert-butyl) -5'-methylphenyl) -5- chlorobenzotriazole (Tinuvin

326), 2- (2'-hydroxy-3 ', 5'-di (tert- butyl) phenyl) -5- chlorobenzotriazole

327), 2- (2H-benzotriazol-2-yl) -4,6-di (tert-pentyl) phenol (Tinuvin

328), 2- (2H-benzotriazol-2-yl) -4- (1,1,3,3-tetramethylbutyl) phenol (Tinuvin

329) or 2,2'-methylenebis (6- (2H-benzotriazol-2-yl) -4- (1,1,3,3-tetramethylbutyl) phenol) (Tinuvin

360).

1577), 프로판 산, 2-[4-[4,6-비스([1,1'-비페닐]-4-일)-1,3,5-트리아진-2-일]-3-히드록시페녹시]-, 이소옥틸 에스테르 (Tinuvin

479), 2-[4-[2-히드록시-3-트리데실옥시프로필]옥시]-2-히드록시페닐]-4,6-비스(2,4-디메틸페닐)-1,3,5-트리아진 (Tinuvin

400), 2-[2-히드록시-4-[3-(2-에틸헥실-1-옥시)-2-히드록시프로필옥시]페닐-4,6-비스(2,4-디메틸페닐)-1,3,5-트리아진 (Tinuvin

405) 또는 2,2'-[6-(2,4-디부톡시페닐) -1,3,5-트리아진-2,4-디일]비스[5-부톡시페놀] (Tinuvin

460)을 들 수 있다. As an example of a compound containing a hydroxyphenyl-s-triazine (HPT) backbone, 2- (4,6-diphenyl-1,3,5-triazin- Oxy) -phenol (Tinuvin

1577), propanoic acid, 2- [4- [4,6-bis ([1,1'-biphenyl] -4- -, < / RTI > iso-octyl ester (Tinuvin

479), 2- [4- [2-hydroxy-3-tridecyloxypropyl] oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) - Tinuvin

400), 2- [2-hydroxy-4- [3- (2-ethylhexyl-1-oxy) -2- hydroxypropyloxy] 1,3,5-triazine (Tinuvin

405) or 2,2 '- [6- (2,4-dibutoxyphenyl) -1,3,5-triazine-2,4-diyl] bis [5-butoxyphenol]

460).

3030), 에틸 2-시아노-3,3-디페닐 아크릴레이트 (Uvinul

3035) 또는 2-에틸헥실 2-시아노-3,3-디페닐 아크릴레이트 (Uvinul

3039)를 들 수 있다. Examples of compounds comprising cyanoacrylate (CA) backbone include 2-propenoic acid, 2-cyano-3,3-diphenyl-, 2,2-bis (2-cyano- , 3'-diphenyl-2-propenyl) oxymethyl-1,3-propanediyl ester (Uvinul

3030), ethyl 2-cyano-3,3-diphenylacrylate (Uvinul

3035) or 2-ethylhexyl 2-cyano-3,3-diphenylacrylate (Uvinul

3039).

The transparent layer may comprise a combination of two or more absorbers of UV absorbers as described above.

The transparent layer comprises up to about 10% by weight of UV absorber, preferably about 0.01 to about 10% by weight of UV absorber, more preferably about 0.05 to 2% by weight of UV absorber, based on the total weight of the transparent layer can do.

The polymer of the transparent layer of the cable of the present invention may be selected from crosslinked and uncrosslinked polymers and polymers of inorganic and organic type.

The polymer of the transparent layer may be a homopolymer or copolymer having thermoplastic and / or elastomeric or thermosetting properties.

The polymer (s) of the inorganic type may be a polyorganosiloxane.

The organic type polymer (s) may be a polyolefin, polyamide, polyurethane, polyester, polyvinyl or halogenated polymer, such as a fluorinated polymer.

The polyolefin may be selected from ethylene and propylene polymers. Examples of ethylene polymers include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), copolymers of ethylene and vinyl acetate (EVA), ethylene and butyl acrylate Copolymers of ethylene and alpha -olefins such as polyethylene / octene copolymers (PEO), copolymers of ethylene and propylene (EPRs), such as polyethylene terephthalate ), An ethylene / ethyl acrylate copolymer (EEA) or a terpolymer of ethylene and propylene (EPT) such as an ethylene / propylene / diene monomer terpolymer (EPDM).

Preferred polymers of the transparent layer are selected from fluorinated polymers and crosslinked ethylene copolymers, more preferably crosslinked ethylene copolymers.

(S), preferably at least about 90% by weight polymer (s), more preferably at least about 95% by weight polymer (s) relative to the total weight of the transparent layer ).

Other additives well known to those skilled in the art, such as plasticizers, lubricants, waxes, antistatic agents or crosslinking agents (e.g., peroxides, silanes) may also be added to the transparent layer of the cable of the present invention have.

Thus, the transparent layer preferably comprises up to about 10% by weight of crosslinking agent (s), preferably from about 0.01 to 10% by weight, based on the total weight of the transparent layer, more preferably from about 0.05 to 5% Of the cross-linking agent (s).

In the present invention, the expression "low density polyethylene" means polyethylene having a density of about 0.91 to 0.925.

In the present invention, the expression "high density polyethylene" means polyethylene having a density of about 0.94 to 0.965.

The polymer preferably exhibits a refractive index of about 1.3 to 1.7.

It is clear that the polymers or polymers of the transparent layer of the cable of the present invention are transparent and transparent, especially through the thicknesses considered for that layer.

The transparent layer is an electrically insulating layer.

The transparent layer is preferably applied to the colored electrically insulating coating of the cable of the present invention by extrusion.

It is noted that the technique of applying the transparent layer to a colored electrically insulating coating of the cable of the present invention should not adversely affect the transparency characteristics.

The transparent layer may additionally comprise UV stabilizers of the hindered amine type (hindered amine light stabilizers or Hindered Amine Light Stabilizer (HALS)).

UV stabilizers of the HALS type may be selected from amine and amino ether derivatives of 2,2,6,6-tetramethyl-piperidine.

144), 비스(1-옥틸옥시-2,2,6,6-테트라메틸-4-피페리딘일)세바케이트 (Tinuvin

5100), 2,4-비스[N-부틸-N-(1-시클로헥실옥시-2,2,6,6-테트라메틸피페리딘-4-일)아미노]-6-(2-히드록시에틸아미노)-1,3,5-트리아진 (Tinuvin

152), 폴리(4-히드록시-2,2,6,6-테트라메틸-1-피페리딘에탄올-알트-1,4-부탄디산)(Tinuvin

622), 폴리[[6-[(1,1,3,3-테트라메틸부틸)아미노]-s-트리아진-2,4-디일]-[(2,2,6,6-테트라메틸-4-피페리딜)이미노]-헥사메틸렌-[2,2,6,6-테트라메틸-4-피페리딜)이미노]] (Chimassorb

944), 2,4,6-트리클로로-1,3,5-트리아진과 [N,N'-비스(2,2,6,6-테트라메틸-4-피페리딘일]-1,6-헥산디아민 중합체, N-부틸-1-부탄아민 및 N-부틸-2,2,6,6-테트라메틸-4-피페리딘아민] (Chimassorb

2020)과의 반응 생성물 또는 말레산 무수물 및 C₂₀-C₂₄ α-알켄과의 2,2,6,6-테트라메틸-4-피페리딘아민의 중합체/올리고머 (Uvinul

5050)를 들 수 있다.Examples of preferred UV stabilizers of the HALS type are bis (1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4- Hydroxyphenyl] methyl] butyl malonate (Tinuvin

144), bis (1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate (Tinuvin

5100), 2,4-bis [N-butyl-N- (1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin- Hydroxyethylamino) -1,3,5-triazine (Tinuvin

152), poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol-alt-1,4-butanedic acid) (Tinuvin

622), poly [[6- [(1,1,3,3-tetramethylbutyl) amino] -s-triazine-2,4-diyl] - [(2,2,6,6- Piperidyl) imino] -hexamethylene- [2,2,6,6-tetramethyl-4-piperidyl) imino]] (Chimassorb

944), 2,4,6-trichloro-1,3,5-triazine and [N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl] Hexanediamine polymer, N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine] (Chimassorb

2020) or maleic anhydride and C ₂₀ -C ₂₄ Polymers / Oligomers of 2,2,6,6-tetramethyl-4-piperidinamine with? -alkenes

5050).

The transparent layer comprises at least about 10 weight percent of a UV stabilizer of the hindered amine type, preferably from about 0.01 to 10 weight percent of a hindered amine type, more preferably at least about 0.05 weight percent, based on the total weight of the transparent layer, To 3% by weight of a UV stabilizer of the hindered amine type.

The transparent layer may further comprise at least one antioxidant.

There is no restriction on the selection of the antioxidant, and the antioxidant is well known to those skilled in the art.

The antioxidant may be, for example, a compound of the thioester type, the phosphite type or the hindered phenol type.

1010), 옥타데실 3-(3,5-디(tert-부틸)-4-히드록시페닐)프로피오네이트 (Irganox

1076), 1,3,5-트리메틸-2,4,6-트리스(3,5-디(tert-부틸)-4-히드록시벤질)벤젠 (Irganox

1330), 4,6-비스(옥틸티오메틸)-o-크레졸 (Irgastab

KV10) 또는 2-[2-[3-(3,5-디(tert-부틸)-4-히드록시페닐)프로판오일옥시]에틸술파닐]에틸 3-(3,5-디(tert-부틸)-4-히드록시페닐)프로파노에이트 (Irganox

1035)를 들 수 있다.As an example of a compound of the phenolic type of hindered pentaerythritol tetrakis (3- (3,5-di (tert-butyl) -4-hydroxyphenyl) propionate) (Irganox

1010), octadecyl 3- (3,5-di (tert-butyl) -4-hydroxyphenyl) propionate (Irganox

1076), 1,3,5-trimethyl-2,4,6-tris (3,5-di (tert-butyl) -4-hydroxybenzyl) benzene

1330), 4,6-bis (octylthiomethyl) -o-cresol (Irgastab

Ethyl-3- (3,5-di (tert-butyl) -4-hydroxyphenyl) propanoyloxy] ) -4-hydroxyphenyl) propanoate (Irganox

1035).

168) 및 비스(2,4-디(tert-부틸)페닐)펜타에리스리톨 디스포스파이트 (Ultranox

626)를 들 수 있다.Examples of phosphite-type compounds include tris (2,4-di (tert-butyl) phenyl) phosphite (Irgafos

168) and bis (2,4-di (tert-butyl) phenyl) pentaerythritol diphosphite (Ultranox

626).

PS800) 및 디스테아릴 티오디프로피오네이트 (Irganox

PS802)를 들 수 있다.Examples of compounds of the thioester type include, but are not limited to, didodecyl 3,3'-thiodipropionate (Irganox

PS800) and distearyl thiodipropionate (Irganox

PS802).

The transparent layer comprises less than or equal to about 10 weight percent antioxidant based on the total weight of the transparent layer, preferably about 0.01 to 10 weight percent antioxidant, more preferably about 0.05 to 3 weight percent antioxidant .

The transparent layer may have a thickness of about 0.01 to 1 mm, preferably in the range of about 50 to 250 microns, more preferably about 150 to 250 microns. If the thickness of the transparent layer is less than 0.01 mm, the transparent layer does not sufficiently protect the colored coating of the cable of the present invention from UV radiation. If the thickness of the transparent layer exceeds 1 mm, the manufacturing cost is high and transparency is not optimal depending on the type of polymer (s) (e.g., crystalline polymer) present in the layer, There is a limitation in selecting the polymers or polymers to be used.

In general, a colored electrically insulating coating of a conventional cable constitutes an external protective covering which is an integral part of the cable, which represents the outermost layer of the cable. In the cable of the present invention, the transparent layer is applied directly around the colored electrically insulating coating and consequently constitutes the outermost layer of the cable.

Since the electrically insulating coating of the cable of the present invention is colored, the coating comprises at least one pigment or one dye, which makes it possible to impart a desired color to the coating.

The dyes or pigments may be selected from dyes or pigments which impart blue, green, yellow, red, white, orange or brown to the dyes.

The colored electrically insulating coating is applied to the coating in an amount of up to about 10% by weight of the pigment or dye, preferably about 1 to 10% by weight of the pigment or dye, more preferably about 1 to 2% Or dyes.

The pigment or dye may be organic or inorganic.

Examples of organic dyes (or pigments) include molecules having a chemical structure of perylene, quinacridone, phthalocyanine, anthraquinone, indolinone or azo type.

Examples of the inorganic dyes or pigments include metal oxides (for example, titanium, zinc or iron oxides), metal sulfides or carbon blacks.

The colored electrically insulating coating comprises at least one polymer selected from crosslinked and uncrosslinked polymers and polymers of inorganic type and organic type.

The colored electrically insulating coating polymer may be a homopolymer or copolymer having thermoplastic and / or elastomeric properties.

The polymer (s) of the inorganic type may be a polyorganosiloxane.

The organic type polymer (s) may be polyolefins, polyurethanes, polyvinyls (e.g., polyvinyl chloride (PVC)) or halogenated polymers.

The polyolefin may be selected from ethylene and propylene polymers. Examples of ethylene polymers include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), copolymers of ethylene and vinyl acetate (EVA), ethylene and butyl acrylate (EMA) or 2-ethylhexyl acrylate (2EHA), copolymers of ethylene and an? -Olefin such as polyethylene / octene (PEO), copolymers of ethylene and propylene ), An ethylene / ethyl acrylate copolymer (EEA) or a terpolymer of ethylene and propylene (EPT) such as an ethylene / propylene / diene monomer terpolymer (EPDM).

Preferred polymers of electrically insulating coatings are selected from ethylene copolymers and polyvinyl chloride (PVC).

The colored electrically insulating coating may comprise at least about 10 weight percent, preferably at least about 30 weight percent polymer (s), based on the total weight of the coating.

The colored electrically insulating coating may further comprise a hydrated flame-retardant inorganic filler. These hydrated flame retardant inorganic fillers act primarily on the physical path by endothermic decomposition (e.g., moisture release), which results in lowering the temperature of the coating and limiting the flame propagation along the cable. The term "flame retardancy" is used in particular.

The coating may comprise from about 20% to 70% by weight of hydrated flame retardant inorganic filler based on the total weight of the coating.

The hydrated flame-retardant inorganic filler may be a metal hydroxide such as magnesium hydroxide or aluminum trihydroxide.

To ensure a "HFFR" (Halogen-Free Flame Retardant) cable, the electrically insulating coating preferably does not contain a halogenated compound. The halogenated compound may have any properties and may be, for example, a fluoropolymer such as polyvinyl chloride (PVC), a halogenated plasticizer, a halogenated inorganic filler, or a chloropolymer.

The colored electrically insulating coating may additionally comprise at least one inert filler.

The inert filler may be chalk, talc or clay (e.g., kaolin).

The coating may comprise from about 5% to 50% by weight of the inert filler based on the total weight of the coating.

The colored electrically insulating coating of the cable of the present invention preferably does not contain stabilizers such as UV absorbers and / or UV stabilizers to prevent premature aging.

The colored electrically insulating coating of the cable of the present invention may include other additives well known to those skilled in the art, such as plasticizers, reinforcing agents and the like.

The colored electrically insulating coating may have a thickness of about 3 mm or less, preferably about 2 mm or less.

In the present invention, the colored electrically insulating coating may surround one or more elongated conductive element (s) that are insulated or uninsulated along the cable.

Preferably, the elongated conductive element is in a central position (in cross section of the cable) in the cable.

In a particularly preferred embodiment, the cable of the present invention is an electrical cable comprising one or more elongated electrically conductive elements.

According to a first alternative form, the electrical cable is arranged between the elongated electrically conductive element and the colored electrically insulating coating, the electrical cable surrounding the elongated electrically conductive element, Further comprising an insulating layer. In this case, the colored electrically insulating coating surrounds the electrically insulating layer and may physically contact the electrically insulating layer.

In this first alternative form a low voltage cable is applied.

According to a second alternative, the electrical cable further comprises, between the elongated electrically conductive element and the colored electrically insulating coating, the following elements:

- a first semi-conducting layer surrounding said elongated electrically conductive element,

An electrically insulating layer surrounding the first semi-conductive layer, and

A second semi-conductive layer surrounding said electrically insulating layer.

In this case, the colored electrically insulating layer surrounds the second semi-conductive layer and can physically contact the second semi-conductive layer.

In this second alternative form an intermediate voltage or high voltage cable is applied.

The elongated electrically conductive element may be a single component conductor, for example a metal wire, or may be a multiple conductor, such as a plurality of metal wires that are not twisted or twisted.

The elongated electrically conductive element may be manufactured from a metal material, in particular selected from aluminum, an aluminum alloy, copper, a copper alloy and combinations thereof.

More specifically, the "semi-conductive layer" may be at least 1.10 ^-9 S / m (siemens per meter), preferably at least 1.10 ^-3 S / m, and preferably less than 1.10 ³ S / m Quot; layer " refers to a layer having an electrical conductivity of at least < / RTI >

In a specific embodiment, the first semi-conductive layer, the electrically insulating layer and the second semi-conductive layer constitute a three-layered insulator. That is, the electrically insulating layer is in direct physical contact with the first semi-conductive layer and the second semi-conductive layer is in physical contact with the electrically insulating layer.

The electrical cable may further include a metal shield surrounding the second semi-conducting layer. In this case, the colored electrically insulating coating encloses the metal shield.

This metal shield is a "wire" shield consisting of a conductor assembly made of copper or aluminum disposed around it along the second semi-conducting layer, copper or aluminum spirally selectively positioned around the second semi- A " strip "shield of one or more conductor metal strips fabricated, or a" leaktight "shield of a metal tube type surrounding the second semi-conducting layer and optionally made of lead or lead alloy. The latter type of leakage protection shields make it possible to form a barrier against moisture which tends to penetrate the electrical cable in the radial direction.

The metal shield of the electrical cable of the present invention may include a "wire" shield and a "leak proof" shield or a "wire" shield and a "strip" shield.

 All types of metal shields can serve to ground the electrical cable, for example, to transmit a fault current if the associated network is short-circuited.

Other layers such as a layer that expands in the presence of moisture can be added between the second semi-conductive layer and the metal shield, and when these layers are present between the metal shield and the colored electrically insulating coating, It is possible to ensure the longitudinal leakage of the cable against water.

1 shows an electric cable 1 according to the invention comprising at least one elongated electrically conductive element 2 and a colored electrically insulating covering 3 surrounding the elongated electrically conductive element 2, Characterized in that the cable further comprises a transparent layer (4) surrounding the colored electrically insulating coating (3), the transparent layer (4) being in direct physical contact with the colored electrically insulating coating (3) Of the polymer and at least one UV absorber. ≪ RTI ID = 0.0 > 1 < / RTI >

Example

The starting materials used in this example are:

- Copolymer of ethylene and vinyl acetate (EVA): Escorene UL00328;

- Silane crosslinking agent: Silpin 59;

- linear low density polyethylene (LLDPE): LL1004;

- Copolymer of ethylene and methyl acrylate (EMA): Lotryl 24MA005;

- polyvinylidene fluoride (PVdF): Kynar 710;

- polyurethane (PU): Elastolan 1185 A10M;

UV absorber containing benzophenone backbone: Chimassorb 81;

UV stabilizers of the HALS type: Chimassorb 944; And

- Antioxidants of impaired phenolic type: Irganox 1010.

Unless otherwise noted, all these starting materials were used as received from the manufacturer.

Particularly, a crosslinked copolymer of ethylene and vinyl acetate (XL EVA) is obtained by blending a copolymer of ethylene and vinyl acetate (EVA, Escorene UL00328) and a silane crosslinking agent (silpin 59); Crosslinked polyethylene (XLPE) is obtained by blending linear low density polyethylene (LLDPE, LL1004) and silane crosslinking agent (silpin 59).

Example  1: Manufacture of cable according to the invention

1 shows an electric cable 1 according to the invention comprising at least one elongated electrically conductive element 2 and a colored electrically insulating coating 3 surrounding the elongated electrically conductive element 2, Characterized in that the cable further comprises a transparent layer (4) surrounding the colored electrically insulating coating (3), the transparent layer (4) being in direct physical contact with the colored electrically insulating coating (3) Of the polymer and at least one UV absorber. ≪ RTI ID = 0.0 > 1 < / RTI >

First, the compositions (A to I) were prepared. The weight content of each component (polymer (s), UV absorber, UV stabilizer, antioxidant) present in the compositions (A-I) is shown in Table 1 below:

[Table 1]

Each of the compositions (A through I) was then extruded and deposited around a colored electrically insulating coating, marketed by Nexans under the name HS2408T Ly to form a transparent layer. It is noted that the colored electrically insulating coating contained 2% by weight of a green organic dye marketed by Polyone under the name 2001-GN-50 B25.

Thus, nine electrical cables according to the invention were obtained comprising a colored electrically insulating coating and a transparent layer surrounding the electrically insulating coating.

The thickness of the transparent layer was approximately 150 to 250 mu m. With this transparent layer, the cable of the present invention showed improved resistance to aging by UV radiation.

Claims (17)

An electrical and / or optical cable comprising at least one elongated conductive element and a colored electrically insulating coating surrounding the elongated conductive element, the cable further comprising a transparent layer surrounding the colored electrically insulating coating Wherein the transparent layer is in direct physical contact with the colored electrically insulating coating and comprises at least one polymer and at least one UV absorbing agent. The method according to claim 1,
Wherein said UV absorber is selected from compounds comprising benzophenone, benzotriazole, hydroxyphenyl-s-triazine and cyanoacrylate backbone. 3. The method according to claim 1 or 2,
Characterized in that said transparent layer comprises up to 10% by weight of UV absorbing agent based on the total weight of said transparent layer. 4. The method according to any one of claims 1 to 3,
Wherein said polymer is selected from crosslinked and non-crosslinked polymers and polymers of inorganic type and organic type. 5. The method according to any one of claims 1 to 4,
Wherein said polymer exhibits a refractive index of 1.3 to 1.7. 6. The method according to any one of claims 1 to 5,
Characterized in that the transparent layer comprises at least 70% by weight of the polymer (s) based on the total weight of the transparent layer. 7. The method according to any one of claims 1 to 6,
Characterized in that said transparent layer additionally comprises UV stabilizers of the hindered amine type. 8. The method of claim 7,
Characterized in that said transparent layer comprises up to 10% by weight, based on the total weight of said transparent layer, UV stabilizers of the hindered amine type. 9. The method according to any one of claims 1 to 8,
Wherein the transparent layer further comprises at least one antioxidant. 10. The method of claim 9,
Characterized in that said transparent layer comprises up to 10% by weight of antioxidant based on the total weight of said transparent layer. 11. The method according to any one of claims 1 to 10,
Wherein the transparent layer has a thickness of 0.01 to 1 mm. 12. The method according to any one of claims 1 to 11,
Characterized in that said colored electrically insulating coating comprises at least one pigment or a dye and said pigment or dye makes it possible to impart a desired color to said coating. cable. 13. The method of claim 12,
Characterized in that said colored electrically insulating coating comprises up to 10% by weight of a pigment or dye based on the total weight of said coating. 14. The method according to any one of claims 1 to 13,
Characterized in that said colored electrically insulating coating comprises at least one polymer selected from crosslinked and uncrosslinked polymers and polymers of inorganic type and organic type. 15. The method of claim 14,
Characterized in that said colored electrically insulating coating comprises at least 10% by weight of polymer (s) based on the total weight of said coating. 16. The method according to any one of claims 1 to 15,
Characterized in that the colored electrically insulating coating further comprises a hydrated flame-retardant inorganic filler. 17. The method according to any one of claims 1 to 16,
Wherein the cable is an electrical cable and comprises at least one elongated electrically conductive element.

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