CN102509573A - Ultra-smooth semi-conductive shielding material for high-voltage direct-current cable - Google Patents
Ultra-smooth semi-conductive shielding material for high-voltage direct-current cable Download PDFInfo
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- CN102509573A CN102509573A CN2011103784816A CN201110378481A CN102509573A CN 102509573 A CN102509573 A CN 102509573A CN 2011103784816 A CN2011103784816 A CN 2011103784816A CN 201110378481 A CN201110378481 A CN 201110378481A CN 102509573 A CN102509573 A CN 102509573A
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Abstract
The invention discloses an ultra-smooth semi-conductive shielding material for a high-voltage direct-current cable, wherein the ultra-smooth semi-conductive shielding material comprises 80-100 parts of polyethylene, 0-20 parts of an ethylene-vinyl acetate copolymer, 5-15 parts of superconductive carbon black, 1-2.5 parts of a cross-linking agent, and 0.1-0.5 part of an antioxygen. A semi-conductive shielding layer prepared from the ultra-smooth semi-conductive shielding material is capable of effectively outputting current and also has an ultra-smooth surface characteristic. The ultra-smooth semi-conductive shielding material has steady performance and can play roles of well uniformizing an electric field, preventing the partial discharge or insulation breakdown problem of the semi-conductive shielding layer resulted from serious electric-field concentration possibly caused by surface defects, inhibiting space charge accumulation in a cable insulation material, and reducing the conductivity of the cable insulation material.
Description
Technical field
The present invention relates to a kind of cable material, specifically is that a kind of high voltage direct current cable is used the ultra-smooth semi-conductive shielding material.
Background technology
Along with the continuous expansion of electric power system, the continuous increase of transmitted power, transmission distance increases gradually, and ac transmission runs into some technical difficulties, and direct current transportation is to solve one of direction of technology of transmission of electricity difficulty.Direct current transportation than ac transmission have transfer efficiency height, line loss little, regulate electric current and change that the power direction of transfer is convenient, investment cost is few, length do not receive capacitance current restriction, can be used as two kinds of electrical networks tie, can reduce advantages such as short circuit current, corona radio interference between backbone and electrical network is little.There is multinomial research to confirm that the space charge in the crosslinked polyethylene is the main cause that causes the early stage failure of insulation of cable.Space charge injects in the dielectric, causes the material internal electric field distortion, and finally causes the puncture of material, and insulating material lost efficacy.Problems with space charge in the dielectric has become the restriction power cable to one of principal element of high electric field development.
It is the structure that the high-voltage alternating of generally acknowledging or direct current cables must have that semiconductive shielding layer must be arranged between conductor and insulation, insulation and external shield; Semiconductive shielding layer can uniform electric field; Reduce the electric stress in the insulating barrier; Prevent stranded conductor and insulating surface generation corona discharge, prevent when short circuit to cause because of conductor is overheated the damage of insulation, the long-time running experience shows that semiconductive shielding layer also has significant impact useful life to cable.
The polyolefinic electric conductivity of semiconductive normally obtains with the method that adds conductive black.Consider from the chain electrical conduction mechanism of carbon black; The addition of carbon black is the biggest factor of domination volume insulation resistance rate (ρ υ) value, only be added to some after, just demonstrate electric conductivity; And the reduction rapidly with the increase of carbon black, till characteristic value near each carbon black oneself.
The prior art semi-conductive shielding material has electric conductivity in order to make material, need a large amount of interpolation carbon blacks, but carbon black belongs to inorganic filler; And compatibility is poor between organic base-material, and a large amount of carbon blacks that add can not be fully compatible with base-material, and when semi-conductive shielding material is extruded; In order to make material have compactness preferably, need bigger pressure, under the effect of extrusion pressure; A large amount of carbon blacks that add also are easier to separate out, and these all cause the semiconductive shielding layer surface smoothness relatively poor.Prior art generally adopts polyethylene and/or ethene-vinyl acetate copolymer (EVA) to be the base-material of material, behind a large amount of interpolation carbon blacks, causes the physical and mechanical properties variation of material; The EVA addition is generally more than 40%; To increase the mechanical and physical performance of base-material,, reduce base-material viscosity as improving tensile strength, the elongation of base-material; Compatibility is also relatively poor between a large amount of EVA that add and the polyethylene, can cause the semiconductive shielding layer surface smoothness relatively poor equally.
If semiconductive shielding layer self can not guarantee electrically smooth (rough surface; Even have sharp-pointed outstanding), there is uneven pit or crack, fracture are arranged, with defective such as insulation loose contact; Just be difficult to play the effect of uniform electric field; Even might cause that serious electric field is concentrated, and cause partial discharge or insulation breakdown, be the main cause that space charge produces.
Add acetylene conductive black or other common conductive black in the prior art semi-conductive shielding material, prepare mixing bigger to quality influence, to the power of shearing force and mixing time length sensitivity relatively; If mixing time is not enough; The bulky grain that carbon black is assembled (at ordinary times between the carbon black pellet) because the effect of cohesive force often is combined into bulky grain; Fully do not disperse, influence is the surfacing and the mechanics physical property of extrudate in the future; If mixing time is oversize, because strong mechanical shear stress can destroy the high structure of carbon black, reducing chain state influences electric conductivity; So semi-conductive shielding material unstable properties.
Summary of the invention
Technical problem to be solved by this invention provides a kind of effectively derived current, also has the super-smooth surface characteristic, and the space charge in the inhibition cable insulation material gathers and reduce the semi-conductive shielding material of its conductivity.
High voltage direct current cable of the present invention is used the ultra-smooth semi-conductive shielding material, and it comprises following component and mass fraction:
Polyethylene 80-100 part;
Vinyl-vinyl acetate copolymer 0-20 part;
Superconduct carbon black 5-15 part;
Crosslinking agent 1-2.5 part;
Antioxidant 0.1-0.5 part.
Said polyethylene is a low density polyethylene (LDPE), and its melt index is 0.8-12g/10min, and density is 0.91-0.925g/cm
3
Vinyl acetate content is between 5%～40% in the said vinyl-vinyl acetate copolymer, and preferably content is at 15%-28%.
Said superconduct black grain diameter is less than 30nm, and the BET specific area is greater than 600m
2/ g, the DBP oil absorption is greater than 200ml/g.
Said crosslinking agent is cumyl peroxide, peroxidating two formyls, di-tert-butyl peroxide or two (t-butyl peroxy isopropyl) benzene.
Said antioxidant is oxygen agent 300, antioxidant BBM, antioxidant 1076, antioxidant CA, antioxidant TPL or antioxidant 1010.
Beneficial effect of the present invention:
With the semiconductive shielding layer of this material preparation, effectively derived current also has the super-smooth surface characteristic.Its stable performance; Can play the good homogeneous effect of electric field; Prevent semiconductive shielding layer because blemish possibly cause serious electric field concentrates, cause the problem of partial discharge or insulation breakdown, suppress space charge in the cable insulation material and gather and reduce its conductivity.
Embodiment
Below in conjunction with specific embodiment the present invention is described further.
Embodiment 1
100 parts of polyethylene;
15 parts of superconduct carbon blacks;
2.5 parts of cumyl peroxides;
0.5 part of antioxidant 300.
Embodiment 2
80 parts of polyethylene;
20 parts of vinyl-vinyl acetate copolymers;
5 parts of superconduct carbon blacks;
1 part of peroxidating two formyl;
0.1 part of antioxidant BBM.
Embodiment 3
90 parts of polyethylene;
10 parts of vinyl-vinyl acetate copolymers;
10 parts of superconduct carbon blacks;
1.5 parts of di-tert-butyl peroxides;
0.2 part of antioxidant 1076.
Embodiment 4
85 parts of polyethylene;
15 parts of vinyl-vinyl acetate copolymers;
8 parts of superconduct carbon blacks;
1.2 parts of two (t-butyl peroxy isopropyl) benzene;
0.3 part of antioxidant CA.
Embodiment 5
95 parts of polyethylene;
5 parts of vinyl-vinyl acetate copolymers;
12 parts of superconduct carbon blacks;
2.2 parts of cumyl peroxides;
0.4 part of antioxidant TPL.
Embodiment 6
100 parts of polyethylene;
5 parts of superconduct carbon blacks;
2.5 parts of di-tert-butyl peroxides;
0.5 part of antioxidant 1010.
High voltage direct current cable involved in the present invention is identical with the semi-conductive shielding material method with high-tension cable with the preparation method of ultra-smooth semi-conductive shielding material; Be specially: polyethylene, superconduct carbon black, antioxidant, crosslinking agent are carried out feeding through weightless electronic scale, weight-loss metering pump; Get in the twin-screw main frame mixing after, get into single screw host, pass through eccentric water smoke pelleter again; The centrifugal dehydrator dehydration is packed behind entering ebullated bed, the finished product bin automatically.Or get into single screw host, the fervent head of air-cooled die face earnestly after, get into the cyclone separator refrigerated separation, get into behind air-cooled lengthening vibrating screen, the feed bin packing automatically.
Polyethylene is cable insulation or shielding material polyethylene commonly used, can be high density polyethylene (HDPE) (HDPE), low density polyethylene (LDPE) (LDPE) or LLDPE (LLDPE).High density polyethylene (HDPE) (HDPE) degree of crystallinity is higher, though can hinder the accumulation that inner because foreign ion dissociates the electric charge that forms, its pliability is relatively poor relatively, is not less than the bending of cable.LLDPE (LLDPE) degree of crystallinity is lower, though pliability is better, and the inner comparatively complicacy of space charge and distribution of space charges that forms easily.So a kind of low density polyethylene (LDPE) (LDPE) of better selecting for use, in order to carry out technology controlling and process and acquisition more performance better, its melt index is 0.8-12g/10min, density is 0.91-0.925g/cm
3
Ethane-acetic acid ethyenyl ester (EVA) copolymer; Be cable insulation or shielding material EVA commonly used, its vinyl acetate (VA) content is 5%～40%, and EVA has introduced VAM in strand; VA content increases; Can reduce degree of crystallinity, improve pliability, impact resistance, filler intermiscibility and heat seal performance, but intensity reduces, is prone to processing.During the VA too high levels, degree of crystallinity is low, the same inner comparatively complicacy of space charge and distribution of space charges that forms easily.In order to carry out technology controlling and process and acquisition more performance better, therefore a kind of VA content of better selecting for use is at 15%-28%.
Polyethylene and/or ethene-vinyl acetate copolymer are the base-material of material, and EVA has good toughness, flexibility and stress cracking resistance and caking property as the moulding base-material, and good relatively anti-flammability; Polyethylene carries out modification to EVA, can increase the mechanical and physical performance of base-material, as improving tensile strength, the elongation of base-material, reduces base-material viscosity, improves extrusion molding property, and making it has toughness preferably at normal temperatures.Because the content of carbon black that the present invention adds than prior art is less, less to the mechanical and physical performance influence of material, the EVA content that therefore need add is also less, only needs 0-20 part, has improved the surface smoothness of semiconductive shielding layer.
Said superconduct carbon black, particle diameter are less than 30nm, and the BET specific area is greater than 600m
2/ g, the DBP oil absorption is greater than 200ml/g.The superconduct carbon black is compared with general conductive black, has electric conductivity and processing characteristics preferably, has reduced critical concentration; The conductive black that same amount ratio is general, the high 3-4 of electric conductivity doubly, conductance likewise; Its consumption only needs about 1/4th; Improved the processability of extruding of shielding material widely, made the minimization of loss of mechanical performance and rheological property aspect, the EVA content that therefore needs to add also significantly reduces.
Superconduct carbon black, particle diameter are less than 30nm, and the particle diameter of carbon black is little, and the population in the unit volume is many, help improving conductivity.
Superconduct black B ET specific area is greater than 600m
2/ g, the DBP oil absorption has bigger specific area greater than 200ml/g than acetylene carbon black and common conductive black; Particle itself demonstrates the hollow shell structure; The volume of per unit weight is very big, helps forming conductive network, good dispersion; Power and mixing time length to shearing force do not have the common conductive black of acetylene conductive black and other responsive, the semi-conductive shielding material stable performance.
Described crosslinking agent is identical with prior art; Processing features according to high-tension cable; And the vulcanization characteristics of polyethylene and ethene-vinyl acetate copolymer material; Select peroxide cross-linking agent for use, like cumyl peroxide, peroxidating two formyls, di-tert-butyl peroxide, two (t-butyl peroxy isopropyl) benzene etc.
Described antioxidant is identical with prior art, for polyethylene and ethene-vinyl acetate copolymer material antioxidant commonly used, like antioxidant 300, antioxidant BBM, antioxidant 1076, antioxidant CA, antioxidant TPL antioxidant 1010 etc.
Above-mentioned these execution modes only are used to explain the present invention, but do not limit the scope of the invention, and after having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
Claims (7)
1. a high voltage direct current cable is used the ultra-smooth semi-conductive shielding material, it is characterized in that comprising following component and mass fraction:
Polyethylene 80-100 part;
Vinyl-vinyl acetate copolymer 0-20 part;
Superconduct carbon black 5-15 part;
Crosslinking agent 1-2.5 part;
Antioxidant 0.1-0.5 part.
2. high voltage direct current cable according to claim 1 is used the ultra-smooth semi-conductive shielding material, it is characterized in that said polyethylene is a low density polyethylene (LDPE), and its melt index is 0.8-12g/10min, and density is 0.91-0.925g/cm
3
3. high voltage direct current cable according to claim 1 and 2 is used the ultra-smooth semi-conductive shielding material, it is characterized in that vinyl acetate content is 5%～40% in the vinyl-vinyl acetate copolymer.
4. high voltage direct current cable according to claim 3 is used the ultra-smooth semi-conductive shielding material, it is characterized in that vinyl acetate content is at 15%-28% in the vinyl-vinyl acetate copolymer.
5. high voltage direct current cable according to claim 1 and 2 is used the ultra-smooth semi-conductive shielding material, it is characterized in that said superconduct black grain diameter less than 30nm, and the BET specific area is greater than 600m
2/ g, the DBP oil absorption is greater than 200ml/g.
6. high voltage direct current cable according to claim 1 and 2 is used the ultra-smooth semi-conductive shielding material, it is characterized in that said crosslinking agent is cumyl peroxide, peroxidating two formyls, di-tert-butyl peroxide or two (t-butyl peroxy isopropyl) benzene.
7. high voltage direct current cable according to claim 1 and 2 is used the ultra-smooth semi-conductive shielding material, it is characterized in that said antioxidant is oxygen agent 300, antioxidant BBM, antioxidant 1076, antioxidant CA, antioxidant TPL or antioxidant 1010.
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| CN2011103784816A CN102509573A (en) | 2011-11-24 | 2011-11-24 | Ultra-smooth semi-conductive shielding material for high-voltage direct-current cable |
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Cited By (9)
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| CN102982858A (en) * | 2012-12-24 | 2013-03-20 | 揭阳市广福电子实业有限公司 | Conductive shielding composite for audio and video signal transmission conductor wire |
| CN104616765A (en) * | 2015-01-22 | 2015-05-13 | 安徽凌宇电缆科技有限公司 | Oil-resistant solvent-resistant motor lead wire |
| CN106146995A (en) * | 2015-03-27 | 2016-11-23 | 国家电网公司 | A kind of preparation method of semiconductive polyolefin slurry |
| CN107325389A (en) * | 2017-07-31 | 2017-11-07 | 江苏德威新材料股份有限公司 | A kind of high-tension cable anti-incipient scorch semi-conductive shielding material and preparation method thereof |
| CN107488295A (en) * | 2017-08-10 | 2017-12-19 | 全球能源互联网研究院 | A kind of 500kV and following direct current cables shielding material 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 |
| CN110698752A (en) * | 2019-10-08 | 2020-01-17 | 深圳市晖耀电线电缆有限公司 | Conductive shielding film material, preparation method thereof and shielding data line |
| CN111635568A (en) * | 2019-03-01 | 2020-09-08 | 全球能源互联网研究院有限公司 | Semiconductive shielding material for high-voltage cable |
| WO2020207312A1 (en) * | 2019-04-12 | 2020-10-15 | 青岛科技大学 | Magnetic composite semiconductive shielding layer for high-voltage direct current cable and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102982858A (en) * | 2012-12-24 | 2013-03-20 | 揭阳市广福电子实业有限公司 | Conductive shielding composite for audio and video signal transmission conductor wire |
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| CN107325389B (en) * | 2017-07-31 | 2020-09-25 | 江苏德威新材料股份有限公司 | Scorch-resistant semi-conductive shielding material for high-voltage cable and preparation method thereof |
| CN107488295A (en) * | 2017-08-10 | 2017-12-19 | 全球能源互联网研究院 | A kind of 500kV and following direct current cables shielding material 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 |
| CN111635568A (en) * | 2019-03-01 | 2020-09-08 | 全球能源互联网研究院有限公司 | Semiconductive shielding material for high-voltage cable |
| WO2020207312A1 (en) * | 2019-04-12 | 2020-10-15 | 青岛科技大学 | Magnetic composite semiconductive shielding layer for high-voltage direct current cable and preparation method thereof |
| CN110698752A (en) * | 2019-10-08 | 2020-01-17 | 深圳市晖耀电线电缆有限公司 | Conductive shielding film material, preparation method thereof and shielding data line |
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Application publication date: 20120620 |