CN1281483A - Water tree retarding additive - Google Patents

Water tree retarding additive Download PDF

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Publication number
CN1281483A
CN1281483A CN 98812126 CN98812126A CN1281483A CN 1281483 A CN1281483 A CN 1281483A CN 98812126 CN98812126 CN 98812126 CN 98812126 A CN98812126 A CN 98812126A CN 1281483 A CN1281483 A CN 1281483A
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composition
formula
linear
additive
cable
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Chinese (zh)
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P·尼兰德
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Borealis AS
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Borealis AS
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    • 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
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/2813—Protection against damage caused by electrical, chemical or water tree deterioration
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C08K5/175—Amines; Quaternary ammonium compounds containing COOH-groups; Esters or salts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/447—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from acrylic compounds

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Organic Insulating Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A water tree retarding additive and a composition for an electric cable comprising it are disclosed. The additive has general formula (I) where n = 1-3, m = 0-3, R1 = -H, -CH3, -(CH2)nCOOH, R2 = (a) a linear or branched, saturated C4-C20 alkyl, (b) a linear or branched, unsaturated C4-C20 alkyl, (c) a linear or branched, saturated C4-C20 acyl, if m=0, (d) a linear or branched, unsatured C4-C20 acyl, if m=0, (e) an aromatic group, (e) in formula (II) where R3 = (a)-(d), and m = 1-3. The additive preferably is N-lauroyl ethylenediamine-N,N',N'-triacetic acid.

Description

Water tree retarding additive
Invention field
The present invention relates to be used for water tree (water tree) suppressant additive of cable.The invention particularly relates to the water tree retarding additive and the composition that are used for cable, for example comprise the composition that is used for insulation layer or semi-conductive layer of this additive.
Background of invention
Cable, particularly the medium and high pressure power cable may comprise around the multilayer polymeric of electrical conductor extrusion molding.For power cable, electrical conductor usually earlier coats one deck semiconductor internal layer, a layer insulating, coats one deck semiconductor skin, one deck waterproof layer and as required again, coats one deck restrictive coating outside waterproof layer again.These coating layers of cable are to be main component with dissimilar general crosslinked vinyl plastics.
The insulation layer of cable is made of vinyl plastics.Noun " vinyl plastics " reaches usually and is meant all that for purposes of the invention with polyethylene or ethylene copolymer be the plastics of main component, and wherein the major part of plastic body is made of vinyl monomer.Therefore, vinyon can comprise the homopolymer or the multipolymer of ethene, wherein multipolymer can be ethene and one or more can with the monomeric multipolymer or the graft copolymer of ethylene copolymer.For extruding cable, be current main cable insulation material through adding the crosslinked LDPE of superoxide (as dicumyl peroxide) (new LDPE (film grade), the i.e. polyethylene for preparing through the high-pressure free radical polymerization).The limitation of conventional LDPE is to have the tendency that forms this defective of dendroid bifurcated (being so-called water tree) under moisture existence and highfield effect, this water tree can cause polymer materials to break and the possibility that electric fault takes place is arranged.The ununiformity that exists in the material, micro-pore and impurity can produce serious influence to the tendency that forms the dendroid bifurcated.Particularly since nineteen seventies, become when polymer materials especially crosslinked polyethylene since the insulating material of medium and high pressure cable, water tree phenomenon has been carried out careful research.In the past few years, this research has impelled is having improvement aspect the quality of the construction of cable, manufacturing processed and material therefor and the cleanliness factor, these improved results have improved the work-ing life of obtained cable, but still need further to improve the water treeing resistance performance of polymer materials.Not only the cable insulation material require improves water-fast tree property, and cable semi-conductive body layer material also needs to improve water-fast tree property.
Water in Whitfield's ointment that 1-2 low alkyl group in the Schiff alkali that European patent application EP-A-0027300 discloses a kind of metal complex by diketone, can be formed by amine replaces and the high-tension cable that can be formed by the salicylic aldehyde that 1-2 low alkyl group replaces is set inhibitor.
EP-A-0057604 is known from European patent specification, and the molecular weight that adds 0.1-20 (weight) % to the semiconductive compositions of mainly being made up of polyolefine and 5-50 (weight) % (in composition total weight) carbon black serve as the polyoxyethylene glycol of about 1000-20000 forming of can suppressing that water sets.This semiconductive compositions is by adding the semi-conductive layer that polyoxyethylene glycol is used as cable, it is said that this semi-conductive layer can avoid forming in the insulation layer on the interface water tree between insulation layer and semi-conductive layer.
In addition, US Patent specification US-A-4812505 discloses and a kind ofly can be used as cable insulation and composition that be water-fast tree.Said composition comprises the alpha-olefin of an ethene and at least a 4-8 of a having carbon atom such as the multipolymer of 1-butylene, 1-hexene or 1-octene, comprises 0.1-20 (weight) %, the molecular weight ranges polyoxyethylene glycol at about 1000-20000 in addition.
Summary of the invention
It has surprisingly been found that, can reach with a kind of water tree retarding additive of specific type and to reduce the excellent effect that the water tree forms, this water tree retarding additive can be used as additive independently and be added in the polymer composition or with composition in polymer phase copolymerization or grafted branches.
Water tree retarding additive of the present invention is a kind of compound with following logical formula I: In the formula: n=1-3;
m=0-3；
R 1=-H、-CH 3、-(CH 2) nCOOH；
R 2=(a) the saturated C of linear or side chain 4-C 20Alkyl,
(b) the unsaturated C of linear or side chain 4-C 20Alkyl,
(c) the saturated C of linear or side chain 4-C 20Acyl group, when m=0,
(d) the unsaturated C of linear or side chain 4-C 20Acyl group is when m=0;
(e) aromatic group;
R in the formula 3=(a)-(d), and m=1-3.
Therefore, the invention provides the water tree retarding additive that is used for cable, it is characterized in that this additive is a kind of compound by above-mentioned logical formula I regulation.
The present invention also provides a kind of composition that is used for cable, it is characterized in that said composition comprises the compound of vinyl plastics and above-mentioned logical formula I regulation.
Other remarkable characteristic of the present invention and advantage can be embodied in following explanation and the appended claims.
Detailed description of the present invention
In above-mentioned formula I, n=1-3, i.e. group-(CH 2) nCOOH representative-CH 2COOH ,-(CH 2) 2COOH or-(CH 2) 3COOH is group-(CH at n=1 2) nCOOH representative-CH 2Be preferred during COOH.
Radicals R 1Can be-H ,-CH 3Or-(CH 2) nCOOH, preferred R 1Be-(CH 2) nCOOH, more preferably R 1Be-CH 2COOH, i.e. n=1.
Radicals R 2Can Direct Bonding on the nitrogen-atoms of last formula I, promptly m can be 0, if R 2Be (c) type or (d) type, then m must be 0.If R 2Be (a) and (b) or (e) type, then m is 0,1,2 or 3 not to be important, and if R 2Be (e) class, then m should be at least 1, is preferably 2.
As formula I finding, R 2Can be selected from C 4-C 20Alkyl group, C 4-C 20Carboxyl groups, aromatic group or-N (R 3)-(CH 2) nCOOH group, wherein R 3Be C 4-C 20Alkyl group or C 4-C 20Carboxyl groups.Alkyl group and carboxyl groups can be linear or side chains, also can be saturated or unsaturated.Aromatic group can comprise one or more aromatic rings such as phenyl and naphthyl, and this aromatic ring can be that nuclear is gone up by one or more aromatic rings that are preferably aliphatic substituting group replacement.Substituting group can be saturated or unsaturated.
Preferred formula I compound is compatible with polymer composition with cable.When the stock polymer in the polymer composition normally during vinyl plastics, this just means R 2Should be lipophilic.
Work as R 2When being unsaturated group, it can comprise one or more pairs of keys, and the group that preferably contains at least one terminal double bond if can make the formula I compound as the vinyl groups that is combined in the comonomer in the polymer composition by copolymerization or graft polymerization effect.The vinyl phenylene be can be used as unsaturated group R 2An example.Work as R 2Be unsaturated group and when making the formula I compound be combined in the polymer composition by copolymerization or grafting, this water tree retarding additive is connected with composition securely by chemical bonding and the migration of additive in can composite inhibiting.
At present, R 1For-CH 2COOH, m=2 and R 2For-N (R 3)-CH 2COOH is that the formula I compound is that the derivative of ethylenediamine triacetic acid is preferred.From the consideration of commercially available property, preferred R 3Be C 4-C 20Carboxyl groups, more preferably linear, saturated C 4-C 20Carboxyl groups such as C 10-C 14Carboxyl groups, and most preferred R 3Be lauroyl (C 12).Therefore, present most preferred formula I compound is N-lauroyl quadrol-N, N ', N ＇-nitrilotriacetic.
The consumption of water tree retarding additive of the present invention in the polymer composition that cable is used should can suppress or avoid the generation of water tree phenomenon effectively under current cable operational conditions.More particularly, the consumption of formula I compound in said composition generally should be about 0.01-10 (weight) %, preferably about 0.01-5 (weight) %, most preferably from about 0.05-3 (weight) % (with composition weight meter).
The formula I compound can be used as water tree retarding additive and is added in the semi-conductive layer of cable and/or in the insulation layer of cable, and preferably is added in the insulation layer at least.
As noted, the insulation layer in the cable is normally made by vinyl plastics, more specifically says so by low density ethylene polymer (LDPE), is preferably that crosslinked low density ethylene polymer makes.Except that The compounds of this invention, insulation layer also can comprise the antioxidant that other conventional additives if can stop the decomposition that causes owing to oxidation, radiation etc., lubricant such as stearic acid, linking agent the time can decompose as heating also can cause crosslinked superoxide etc. and other water except that formula I compound according to the present invention is set inhibitor.
When polymer composition constituted the cable semi-conductive layer, vinyl plastics are ethylene copolymer such as ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-butyl acrylate copolymer (EBA) or ethylene-vinyl acetate copolymer (EVA) normally.This polymer composition also comprises carbon black, and the sooty consumption should be enough to make composition have semi-conductivity, and preferable amount is about 15-45 (weight) % (with composition weight meter).
For the ease of understanding the present invention, will provide several illustrative non-limiting examples below.Except as otherwise noted, all umbers and per-cent all are meant weight.
Embodiment 1
At present embodiment, be that polymer A, B and C test with the semi-conductivity polymer composition to three kinds of cables.
First kind of composition (polymer A) is ethylene-butyl acrylate copolymer (EBA), 0.65 weight part 1 that is contained 17 weight % butyl acrylates by 60.35 weight parts, 2-dihydro-2,2,4-trimethylquinoline polymkeric substance (trade(brand)name Vulcanox HPG) and 39 weight parts are that the carbon black (furnace treated black, Cabot CSX 254) that makes composition be semi-conductivity is formed.Said composition is as reference.
Second kind of composition (polymer B) is made up of EBA polymkeric substance identical in 60.15 weight parts and the first kind of composition, the poly-trimethylquinoline of 0.65 weight part and 39 weight part carbon blacks.Polymer B also contains 0.2 weight part N-lauroyl quadrol-N, N ', N ＇-nitrilotriacetic.Said composition is according to a kind of composition of the present invention.
The third composition (polymkeric substance C) removes N-lauroyl quadrol-N, and outside N ', N '-nitrilotriacetic replaced with 0.2 weight part ethylenediamine tetraacetic acid (EDTA) (EDTA), all the other were identical with polymer B.Logical formula I does not comprise the chemical formula of EDTA, so polymkeric substance C is not according to composition of the present invention.
Every kind of composition is used as the semi-conductivity internal layer respectively in above-mentioned three kinds in cable, this cable from inner core to appearance, comprise that 1.4 millimeters copper conductors, external diameter are the semi-conductivity skin that 2.8 millimeters semi-conductivity internal layer, insulation layer that external diameter is 5.8 millimeters and external diameter are 6.1 millimeters, insulation layer is that density is 0.923 gram per centimeter 3With MFR be/10 minutes new LDPE (film grade)s of 2 grams, and the semi-conductivity skin is to have added about 40 (weight) % sooty ethylene-butyl acrylate copolymer.
The dielectric strength of above-mentioned test cable is according to Alcatel AG ﹠amp; CO, Hannover, the method and the Land H.G. of Germany exploitation, Sch  dlich Hans " under midium voltage cable sizing material water action condition, estimate aging resistance the cable model test (Model Cable Testfor Evaluating the Ageing Behaviour under Water Influence ofCompounds for Medium Voltage Cables ", (Conference Proceedingsof J1 Cable 91,24-28 June 1991, Versaille, France) explanation of being done in the paper is measured.63% of the Emax that represents with kvolts/millimeter among the Weibull figure is defined as the dielectric strength value.Cable under 90 ℃ after 16 hours environment is regulated, in strength of electric field 9 kvolts/millimeter and in aging 1000 hours, then cable is remained on 85 ℃ and measure its dielectric strength (T=1000 hour) by 70 ℃ of water of internal layer electrical conductor heating.Except that dielectric strength, also measure uncovered water tree (vented tree) number/square millimeter of polymer A and B and the length that the longest bow tie water is set (bow-tie tree), test-results is illustrated in the table 1.
Table 1
Polymer A Polymer B Polymkeric substance C
Dielectric strength (kV/mm) T=1000h ?34．3 ?78．1 ?47．4
Uncovered water tree number/mm 2 ?0．34 ?0．00
The maximum length L of uncovered water tree 90％(μm) 1190 ?0
The maximum length (μ m) of bow tie water tree 511 ?120
By table 1 data presentation, comprise according to each institute's performance of trying of the composition of water tree retarding additive of the present invention all very excellent.
Table 1 data show that also the polymkeric substance C that comprises the additive that is similar to additive of the present invention but does not belong to the formula I scope does not reach according to the such high dielectric strength of polymer B of the present invention.
Embodiment 2
By so-called Ashcraft test four kinds of cables being carried out water-fast tree property (WTR) with the insulating polymer composition measures.
The Ashcraft test is a kind of test method of measuring polymkeric substance WTR performance, this method is by Ashcraft, A.C. at " the water tree (Water Treeing inPolymeric Dielectrics) in the dielectric polymer " (World Electrotechnical Congress inMoscow, USSR, 22 June 1977) be described in.The Ashcraft test method provides good sign effect, this method adopts the compression moulding cup-and-cone shape sample of depression, water-filling in cup-shaped sample, between the water surface and cup end outside surface (this surface earthing), apply 5 kilovolts/6 kilo hertzs voltages, specimen temperature is constant in 65 ℃, will through the mean lengths of 72 hours formed water trees in aging back as this insulating material in water set measuring of growth velocity.
For test, by different polymkeric substance is that polymkeric substance 1, polymkeric substance 2, polymkeric substance 3 and polymkeric substance 4 prepare compression molding sample respectively, wherein polymkeric substance 1 is that 0.923 gram/cubic centimetre, melt flow rate (MFR) (MFR) are formed by 2 grams/10 minutes new LDPE (film grade) (LDPE) and 0.2 weight part thiobisphenol by 99.8 weight part density, and this polymkeric substance 1 is as reference; Polymkeric substance 2 is according to a kind of composition of the present invention, by new LDPE (film grade), the 0.2 weight part Irganox of 99.3 weight parts and polymkeric substance 1 same type 1035 and 0.5 weight part N-lauroyl quadrol-N, N ', N ＇-nitrilotriacetic is formed; Polymkeric substance 3 is according to a kind of composition of the present invention, and institute forms by the above-mentioned LDPE of 99.45 weight parts, 0.2 weight part thiobisphenol (Rhodianox TBM6P) and 0.35 weight part oleoylsarcosine (the single acetate of N-oleoyl-N-methyl-N-); Polymkeric substance 4 also is according to a kind of composition of the present invention, by the above-mentioned LDPE of 99.5 weight parts, 0.35 weight part Vulcanox HPG and 0.15 weight part N-lauroyl-quadrol-N, and N ', N ＇-nitrilotriacetic is formed.Each polymer composition also contains about 2 parts by weight of dicumyl peroxide as crosslinked usefulness.The result of Ashcraft test is compiled in table 2.
Table 2
Composition Water tree mean length (%)
Polymkeric substance 1 (reference) ????100
Polymkeric substance 2 (the present invention) ????60
Polymkeric substance 3 (the present invention) ????61
Polymkeric substance 4 (the present invention) ????70
These test-results show that significantly composition according to the present invention has high WTR performance.

Claims (10)

1. water tree retarding additive that is used for cable is characterized in that this additive is a kind of compound with logical formula I: In the formula: n=1-3;
m=0-3；
R 1=-H、-CH 3、-(CH 2) nCOOH；
R 2=(a) the saturated C of linear or side chain 4-C 20Alkyl,
(b) the unsaturated C of linear or side chain 4-C 20Alkyl,
(c) the saturated C of linear or side chain 4-C 20If acyl group is m=0;
(d) the unsaturated C of linear or side chain 4-C 20If acyl group is m=0;
(e) aromatic group;
R in the formula 3=(a)-(d), and m=1-3.
2. according to the additive of claim 1, n=1 wherein.
3. according to the additive of claim 1 or 2, R wherein 1=-(CH 2) nCOOH.
4. according to any one additive among the claim 1-3, wherein m=2 and R 2=(f).
5. according to any one additive among the claim 1-4, the compound of its formula of (I) is N-lauroyl quadrol-N, N ', N '-nitrilotriacetic.
6. composition for electric is characterized in that said composition comprises the compound of vinyl plastics and logical formula I: In the formula: n=1-3;
m=0-3；
R 1=-H、-CH 3、-(CH 2) nCOOH；
R 2=(a) the saturated C of linear or side chain 4-C 20Alkyl,
(b) the unsaturated C of linear or side chain 4-C 20Alkyl,
(c) the saturated C of linear or side chain 4-C 20If acyl group is m=0;
(d) the unsaturated C of linear or side chain 4-C 20If acyl group is m=0;
(e) aromatic group;
Figure 9881212600032
R in the formula 3=(a)-(d), and m=1-3.
7. according to the composition of claim 6, wherein the content of composition formula of (I) compound is 0.01-10 (weight) %.
8. according to the composition of claim 6, the compound of its formula of (I) is N-lauroyl quadrol-N, N ', N ＇-nitrilotriacetic.
9. according to the composition of claim 6 or 7, wherein composition forms the cable insulation layer.
10. according to the composition of claim 6 or 7, wherein composition comprises carbon black, and the sooty consumption should be enough to make composition to have semi-conductivity and can be configured as the cable semi-conductive layer.
CN 98812126 1997-11-12 1998-11-02 Water tree retarding additive Pending CN1281483A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9704137A SE9704137L (en) 1997-11-12 1997-11-12 Composition for electric cables
SE97041370 1997-11-12

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JP (1) JP2001522919A (en)
KR (1) KR20010052099A (en)
CN (1) CN1281483A (en)
AU (1) AU9773698A (en)
SE (1) SE9704137L (en)
WO (1) WO1999024504A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103824642A (en) * 2014-02-10 2014-05-28 国家电网公司 Flexible power cable with moisture-resistant and aging-resistant performances
US11952503B2 (en) 2018-03-20 2024-04-09 Dow Global Technologies Llc Polyolefin and polyvinylpyrrolidone formulation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6656986B2 (en) 2001-03-01 2003-12-02 Union Carbide Chemicals & Plastics Technology Corporation Polyethylene crosslinkable composition

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2275859A1 (en) * 1974-06-21 1976-01-16 Anvar INSULATING MATERIALS PROMOTING THE EXTINCTION OF PARTIAL DISCHARGES
ATE172320T1 (en) * 1991-05-15 1998-10-15 Basf Ag MEDIUM AND HIGH VOLTAGE ELECTRICAL CABLE WITH A CABLE SHEATH OF HIGH RESISTANCE TO THE FORMATION AND GROWTH OF WATER TREES
WO1995009426A1 (en) * 1993-09-29 1995-04-06 University Of Connecticut An improved insulated electric cable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103824642A (en) * 2014-02-10 2014-05-28 国家电网公司 Flexible power cable with moisture-resistant and aging-resistant performances
CN103824642B (en) * 2014-02-10 2016-04-06 国家电网公司 There is the flexible power cable of resistance to humid-ageing exposure
US11952503B2 (en) 2018-03-20 2024-04-09 Dow Global Technologies Llc Polyolefin and polyvinylpyrrolidone formulation

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WO1999024504A1 (en) 1999-05-20
SE9704137L (en) 1999-05-13
EP1030879A1 (en) 2000-08-30
KR20010052099A (en) 2001-06-25
SE9704137D0 (en) 1997-11-12
AU9773698A (en) 1999-05-31
JP2001522919A (en) 2001-11-20

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