CN103665525A - High voltage direct current cable insulation material - Google Patents

High voltage direct current cable insulation material Download PDF

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Publication number
CN103665525A
CN103665525A CN201310691064.6A CN201310691064A CN103665525A CN 103665525 A CN103665525 A CN 103665525A CN 201310691064 A CN201310691064 A CN 201310691064A CN 103665525 A CN103665525 A CN 103665525A
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CN
China
Prior art keywords
parts
potassium titanate
insulation material
cable insulation
insulating material
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
CN201310691064.6A
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Chinese (zh)
Inventor
陈晓军
马壮
刘军
夏亚芳
李昆昌
韩俊杰
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.)
Wuxi Jiangnan Cable Co Ltd
Original Assignee
Wuxi Jiangnan Cable Co Ltd
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 Wuxi Jiangnan Cable Co Ltd filed Critical Wuxi Jiangnan Cable Co Ltd
Priority to CN201310691064.6A priority Critical patent/CN103665525A/en
Publication of CN103665525A publication Critical patent/CN103665525A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/001—Conductive additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)

Abstract

The invention provides a high voltage direct current cable insulation material, which comprises the following components in parts by weight: 100 parts of LDPE (Low-density Polyethylene), 1-2 parts of CPE (Chlorinated Polyethylene), 0.5-1.5 parts of BaTiO3, 0.6-1.5 parts of conductive potassium titanate whisker, 1-2.5 parts of a cross-linking agent, and 0.1-0.5 part of an antioxygen. A semiconductive polyolefin shielding material prepared from the high voltage direct current cable insulation material has the advantages of ultra-smooth surface feature, good physical property and excellent overall performance; electric current is effectively output to form a favorable uniform electric field, and partial discharge or insulation breakdown caused by severe electric field concentration due to surface defects of a semiconductive shielding layer is prevented; ionized charge and injected charge are absorbed in a deep trap, so that charge accumulating in a local area is avoided, space charge accumulation in a cable insulation material is restrained, and electrical conductivity of the cable insulation material is reduced.

Description

A kind of high-voltage DC cable insulating material
Technical field
The present invention relates to cable material field, specifically a kind of high-voltage DC cable insulating material.
Background technology
Along with the continuous expansion of power system, the continuous increase of transmitted power, transmission distance increases gradually, and alternating current transmission runs into some technical difficulties, and direct-current transmission is to solve one of direction of technology of transmission of electricity difficulty.Direct-current transmission has that transport efficiency is high, line loss is little, regulates electric current and changes that power direction of transfer is convenient, investment cost is few than alternating current transmission, length be not subject to capacitive current restriction, can be used as two kinds of electrical networks tie, can reduce the advantages such as short-circuit current, corona wireless interference between trunk main and electrical network is little.Have and multinomially studies confirm that the space charge in crosslinked polyethylene is the major cause that causes the early stage failure of insulation of cable.Space charge injects in dielectric medium, causes material internal electric field distortion, and finally causes puncturing of material, and insulating material lost efficacy.Problems with space charge in dielectric has become restriction power cable to one of principal element of high electric field development.
Summary of the invention
The present invention is in order to solve the problem of prior art, provide a kind of space charge that can suppress in cable insulation material to gather and reduced its specific conductivity, effective derived current, mechanical and physical performance is good, also has the semiconductor strippable polyolefine shielding material of super-smooth surface characteristic.
The present invention includes following component and mass fraction:
100 parts of LDPE;
CPE 1-2 part;
BaTiO 30.5-1.5 part;
Conduction potassium titanate crystal whisker 0.6-1.5 part;
Linking agent 1-2.5 part;
Oxidation inhibitor 0.1-0.5 part.
Described LDPE melting index is 0.8-12g/10min, and density is 0.91-0.925g/cm 3, use metallocene catalyst catalysis.
Described conduction potassium titanate crystal whisker is a kind of surface Sb/SnO 2carry out the conduction crystal whisker of hexa potassium titanate of electroconductibility processing.
Described conduction crystal whisker of hexa potassium titanate is processed with the stearic acid of its quality 2.5%-3.5%.
Described linking agent is dicumyl peroxide, peroxidation two formyls, ditertiary butyl peroxide or two benzene.
Described oxidation inhibitor is oxygen agent 300, oxidation inhibitor BBM, antioxidant 1076, antioxidant CA, oxidation inhibitor TPL or antioxidant 1010.
Beneficial effect of the present invention is:
1, the insulating material of preparing with this material, the space charge that can suppress in cable insulation material gathers, good physical performance, excellent combination property.
2, Low Density Polyethylene (LDPE) snappiness is good, can hinder inner accumulation of dissociating the electric charge that forms due to foreign ion.
3, Low Density Polyethylene (LDPE) has nucleator effect, has reduced spherulite size, has improved crystallization integrity degree, thereby has reduced the generation of space charge.
4, add a small amount of CPE and be equivalent to increase the trap density in insulating material, attract movably free carrier, prevent the orderly movement of electric charge under electric field action, thereby stop the formation of space charge, can effectively reduce space-charge effect and volume specific resistance, improve direct current precompressed short circuit branch starting voltage.BaTiO 3for extremely strong property material, can effectively improve polyethylene Space-charge effect, improve direct current precompressed short circuit disruptive strength and DC breakdown intensity.
5, potassium titanate crystal whisker surface Sb/SnO 2carry out after electroconductibility processing, as electro-conductive material, after electroconductibility is processed, at K+ ion, form powerful electric field around, attract the negative pole center of polar molecule, thereby can neutralize the space charge of generation, stop space charge to shift to isolator, reach the object of effective elimination space charge.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
100 parts of polyethylene;
2 parts of CPE;
BaTiO 31.5 part;
1.5 parts of conduction potassium titanate crystal whiskers;
2.5 parts of dicumyl peroxides;
0.5 part of antioxidant 300.
Embodiment 2
100 parts of polyethylene;
1 part of CPE;
BaTiO 30.5 part;
0.6 part of conduction potassium titanate crystal whisker;
Peroxidation two formyl chloride-1 parts;
0.1 part of oxidation inhibitor BBM.
Embodiment 3
100 parts of polyethylene;
1.5 parts of CPE;
BaTiO 31.2 part;
0.8 part of conduction potassium titanate crystal whisker;
1.5 parts of ditertiary butyl peroxides;
0.2 part of antioxidant 1076.
Embodiment 4
100 parts of polyethylene;
1.2 parts of CPE;
BaTiO 31 part;
1.2 parts of conduction potassium titanate crystal whiskers;
1.2 parts of two (t-butyl peroxy sec.-propyl) benzene;
0.3 part of antioxidant CA.
Embodiment 5
100 parts of polyethylene;
1.8 parts of CPE;
BaTiO 30.7 part;
10 parts of conduction potassium titanate crystal whiskers;
2.2 parts of dicumyl peroxides;
0.4 part of oxidation inhibitor TPL.
Embodiment 6
100 parts of polyethylene;
1.6 parts of CPE;
BaTiO 30.6 part;
14 parts of conduction potassium titanate crystal whiskers;
2.5 parts of ditertiary butyl peroxides;
0.5 part of antioxidant 1010.
The preparation method of high-voltage DC cable insulating material involved in the present invention is all by insulating material material method mutually with high-tension cable: by LDPE, CPE, BaTiO 3, conduction potassium titanate crystal whisker, linking agent, oxidation inhibitor carries out feeding by weightless electronic scales, weight-loss metering pump; Enter mixing in twin screw main frame after, enter single screw host, then pass through eccentric water smoke dicing machine, centrifuge dehydration, enters after ebullated bed, finished product bin packing automatically.
Or enter single screw host, air-cooled die-surface hot cutting head earnestly after, enter cyclonic separator refrigerated separation, enter after air-cooled lengthening vibratory screening apparatus, feed bin packing automatically.
LDPE(Low Density Polyethylene) be that cable insulation or shielding material are conventional.High density polyethylene(HDPE) (HDPE) degree of crystallinity is higher, although can hinder inner accumulation of dissociating the electric charge that forms due to foreign ion, its snappiness is relatively poor, is not less than the bending of cable.Linear low density polyethylene (LLDPE) degree of crystallinity is lower, although snappiness is better, the distribution of inner easily formation space charge and space charge is comparatively complicated.And select Low Density Polyethylene (LDPE), snappiness is good, can hinder inner accumulation of dissociating the electric charge that forms due to foreign ion.In order to carry out better technology controlling and process and to obtain better properties, its melting index is 0.8-12g/10min, and density is 0.91-0.925g/cm 3.
Better LDPE selects a LDPE for metallocene catalyst catalysis, is called for short MLDPE.Can suppress the growth of water tree in polyethylene, improve the breakdown characteristics of polymkeric substance.In MLDPE, in LDPE, there is nucleator effect, reduced spherulite size, improved crystallization integrity degree, thereby reduced the generation of space charge.Metallocene catalyst is generally comprised of three components: organometallic complex, promotor, carrier; In solution polymerization, do not need carrier, organometallic complex is combined and forms with various organism substituting groups by transition metal, and its weight accounts for the 1-2% of catalyst weight.Promotor has the effect of strengthening transition metal system.The LDPE of metallocene catalyst catalysis, molecular weight and composition distributed pole are narrow, and polymkeric substance chain length and side chain interval that metallocene catalyst is produced are all consistent, thereby each chain has its essentially identical copolymerization unit content.The polymerization activity life-span is long, stable performance.
CPE(chlorinatedpolyethylene) be polar polymer, for cable industry is commonly used, the saturated macromolecular material being made through chlorination substitution reaction by polyethylene, has good weather resisteant, resistance to ozone, chemical-resistant resistance and ageing-resistant performance, has good oil-proofness, flame retardant resistance and tinctorial property.In polyethylene, effect is equivalent to increase the trap density in insulating material, attracts movably free carrier, prevents the orderly movement of electric charge under electric field action, thereby stops the formation of space charge.Can effectively reduce space-charge effect and volume specific resistance, improve direct current precompressed short circuit branch starting voltage.A kind of CPE that selects preferably cl content 25%-40%.
BaTiO 3for extremely strong property material, barium titanate is a kind of strong dielectric material, and specific inductivity is up to more than 104.BaTiO 3effect in polyethylene is conflicting: it increases on the one hand the electricity of polythene material and leads; Increase again on the other hand the trap of polythene material.When BaTiO3 adds suitable massfraction, 2 kinds of effects are vied each other and are reached equilibrium state, can effectively improve polyethylene Space-charge effect, improve direct current precompressed short circuit disruptive strength and DC breakdown intensity.A kind ofly better select ultra-fine BaTiO 3, can there is good processing performance, be easy to mix.Further improve and select nanometer BaTiO 3, the microcosmic atom that the character of nano material itself changes and the effect between the performance of macroscopic material, the small-size effect that nanoparticle has can make original deep trap in polymkeric substance become shallow trap, thereby further reduces space-charge effect.
Conduction crystal whisker of hexa potassium titanate is potassium titanate crystal whisker surface Sb/SnO 2carry out after electroconductibility processing, as electro-conductive material, its addition is less than the consumption of graphitized carbon black, the good physicochemical property that can not only keep original potassium titanate crystal whisker: high strength, high-modulus, high temperature resistant, anticorrosive, there is processing performance good, micro-fillibility is good, many significant advantages such as reinforced plastics goods isotropy, good stability of the dimension, surface smoothness is high, Frictional Slipping performance is good, but also possessed electroconductibility uniform and stable under hot-cool environment, can by Demand Design arbitrarily suitable resistance value, and can be painted arbitrarily.In six potassium titanate crystalline structure, the ligancy of Ti is 6, with TiO 6octahedra by common rib and the coplanar chain tunnel structure that links, K +in the middle of ion local tunnel, separate with environment, after electroconductibility is processed, at K +ion forms powerful electric field around, attracts the negative pole center of polar molecule, thereby can neutralize the space charge of generation, stops space charge to shift to isolator, reaches the object of effective elimination space charge.
A kind of better conduction six potassium titanates are brilliant processes rear use with the stearic acid of 2.5%-3.5%.Conduction potassium titanate crystal whisker and material have good homogeny, easily disperse, but because of itself tiny (diameter 0.2-1.5 μ m, length 10-50 μ m), surface has very strong wetting ability, causes its easily reunion, poor with the wettability of organic matrix, after moisture absorption, is difficult to and polymer-compatible.And stearic acid belongs to anion surfactant, molecule one end is chain alkyl, and its structure and polymer molecular structure are approximate, thereby have certain consistency with organic high polymers base-material; The molecule the other end is hydroxyl, can physics, chemical action occur with inorganic conductive potassium titanate crystal whisker surface, can improve the affinity of conduction potassium titanate crystal whisker and superpolymer base-material, improves its degree of scatter in superpolymer base-material.In addition, itself has lubrication stearic acid, also can make compound system internal friction reduce, and improves the flowing property of compound system, reduces the melt viscosity of polymkeric substance.Compare and have better modified effect with prior art silane coupling agent, titanate coupling agent, aluminum-zirconium coupling agent, a kind of better consumption is the 2.5%-4% of conduction potassium titanate crystal whisker, and its activation index can reach more than 90%.Can, in advance to adding and use after conduction potassium titanate crystal whisker modification, also can directly add use.
Described linking agent is same as the prior art, according to the processing features of high-tension cable, and the vulcanization characteristics of polyethylene and ethene-vinyl acetate copolymer material, select peroxide cross-linking agent, as dicumyl peroxide, peroxidation two formyls, ditertiary butyl peroxide, two (t-butyl peroxy sec.-propyl) benzene etc.
Described oxidation inhibitor is same as the prior art, for polyethylene and the conventional oxidation inhibitor of ethene-vinyl acetate copolymer material, as antioxidant 300, oxidation inhibitor BBM, antioxidant 1076, antioxidant CA, oxidation inhibitor TPL antioxidant 1010 etc.
The concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvement, these improvement also should be considered as protection scope of the present invention.

Claims (6)

1. a high-voltage DC cable insulating material, is characterized in that: comprise following component and mass fraction:
100 parts of LDPE;
CPE 1-2 part;
BaTiO 30.5-1.5 part;
Conduction potassium titanate crystal whisker 0.6-1.5 part;
Linking agent 1-2.5 part;
Oxidation inhibitor 0.1-0.5 part.
2. high-voltage DC cable insulating material according to claim 1, is characterized in that: described LDPE melting index is 0.8-12g/10min, and density is 0.91-0.925g/cm 3, use metallocene catalyst catalysis.
3. high-voltage DC cable insulating material according to claim 1, is characterized in that: described conduction potassium titanate crystal whisker is a kind of surface Sb/SnO 2carry out the conduction crystal whisker of hexa potassium titanate of electroconductibility processing.
4. high-voltage DC cable insulating material according to claim 3, is characterized in that: described conduction crystal whisker of hexa potassium titanate is processed with the stearic acid of its quality 2.5%-3.5%.
5. high-voltage DC cable insulating material according to claim 1, is characterized in that: described linking agent is dicumyl peroxide, peroxidation two formyls, ditertiary butyl peroxide or two benzene.
6. high-voltage DC cable insulating material according to claim 1, is characterized in that: described oxidation inhibitor is oxygen agent 300, oxidation inhibitor BBM, antioxidant 1076, antioxidant CA, oxidation inhibitor TPL or antioxidant 1010.
CN201310691064.6A 2013-12-17 2013-12-17 High voltage direct current cable insulation material Pending CN103665525A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105070393A (en) * 2015-07-26 2015-11-18 尹红 High voltage cable applied to power system
CN106700195A (en) * 2016-11-04 2017-05-24 上海交通大学 High-voltage and direct-current cable insulating material and preparation method of high-voltage and direct-current cable insulating material
CN108129725A (en) * 2017-12-05 2018-06-08 东南大学 A kind of insulating materials of resistance to superhigh voltage DC and preparation method thereof
CN109438807A (en) * 2018-10-29 2019-03-08 北京科技大学 A kind of insulating materials and its preparation method and application
US10899092B1 (en) 2020-03-24 2021-01-26 Prince Mohammad Bin Fahd University Method for making polyolefin-perovskite nanomaterial composite

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CN101701081A (en) * 2009-09-18 2010-05-05 江苏达胜热缩材料有限公司 Thermal-shrinkage stress control pipe material

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105070393A (en) * 2015-07-26 2015-11-18 尹红 High voltage cable applied to power system
CN106298036A (en) * 2015-07-26 2017-01-04 常熟市谷雷特机械产品设计有限公司 A kind of power system high tension cable
CN106298037A (en) * 2015-07-26 2017-01-04 常熟市谷雷特机械产品设计有限公司 A kind of high pressure resistant layer material of high tension cable
CN105070393B (en) * 2015-07-26 2017-03-22 陕西永光电力电缆制造有限公司 High voltage cable applied to power system
CN106700195A (en) * 2016-11-04 2017-05-24 上海交通大学 High-voltage and direct-current cable insulating material and preparation method of high-voltage and direct-current cable insulating material
CN106700195B (en) * 2016-11-04 2021-03-09 上海交通大学 High-voltage direct-current cable insulating material and preparation method thereof
CN108129725A (en) * 2017-12-05 2018-06-08 东南大学 A kind of insulating materials of resistance to superhigh voltage DC and preparation method thereof
CN109438807A (en) * 2018-10-29 2019-03-08 北京科技大学 A kind of insulating materials and its preparation method and application
CN109438807B (en) * 2018-10-29 2020-12-01 北京科技大学 Insulating material and preparation method and application thereof
US10899092B1 (en) 2020-03-24 2021-01-26 Prince Mohammad Bin Fahd University Method for making polyolefin-perovskite nanomaterial composite
US11130296B1 (en) 2020-03-24 2021-09-28 Prince Mohammad Bin Fahd University Method of forming electrically and thermally conductive polyolefin-perovskite nanomaterial composites having increased dielectric permittivity and breakdown-induced electrical and thermal conduction pathways
US11345101B2 (en) 2020-03-24 2022-05-31 Prince Mohammad Bin Fahd University Polymer composite material having oriented electrically and thermally conductive pathways

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Application publication date: 20140326