CN101445628A - Chemical crosslink polyethylene insulating plastic used for water tree resistant power cable and application thereof - Google Patents
Chemical crosslink polyethylene insulating plastic used for water tree resistant power cable and application thereof Download PDFInfo
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- CN101445628A CN101445628A CNA2008102079332A CN200810207933A CN101445628A CN 101445628 A CN101445628 A CN 101445628A CN A2008102079332 A CNA2008102079332 A CN A2008102079332A CN 200810207933 A CN200810207933 A CN 200810207933A CN 101445628 A CN101445628 A CN 101445628A
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Abstract
The invention discloses a chemical crosslink polyethylene insulating plastic used for a water tree resistant power cable and application thereof. The insulating plastic comprises the components based on the parts by weight: 100 parts of polyethylene resin, 0.5-4 parts of ethylene-acrylic ester multipolymer, 1.0-3.0 parts of peroxide, 0.02-2 parts of compound antioxidizer, 0.1-0.5 parts of nucleating agent and 0.1-1 part of siloxane. The chemical crosslink polyethylene insulating plastic used for the medium-low pressure water tree resistant power cable has good extrudability and cable forming property, less impurity content, excellent water tree resistant performance, improved internal lubricity and good surface performance; under the same current, the extruded velocity of the cable is high, the processing temperature is reduced, less low molecular gas is generated, the impurities and defects inside the material get less, the degree of crystallinity and the water tree resistant performance are improved, the production energy consumption is reduced, and the production efficiency is improved. Therefore, the invention can be used for an insulating layer or a restrictive coating of medium-low pressure power cable.
Description
Technical field
The present invention relates to chemical crosslink polyethylene insulating plastic used for water tree resistant power cable and purposes under a kind of mesolow.
Background technology
The water tree is a mesohigh crosslinking polyethylene-insulated cable insulation destructive major cause.Therefore, the cross-linked poly-ethylene cable material of studying water-fast branch has important economic value to the quality that improves China's crosslinking polyethylene-insulated cable insulation.
The place that the water tree produces is accompanied by the existence of space charge.Crosslinked polyetylene insulated space-charge effect is the principal element of restriction power cable insulation dielectric strength.Many investigators have been found that in polyolefin compound adding a spot of polar group can significantly reduce space charge accumulation in the insulation, also can obviously reduce the formation probability of electric branch.The multipolymer of ethene and acrylate, as polar group two kinds of effects are arranged in non-polar polymer: the one, the trap of increase electric charge, C=O group and OH group are equivalent to dipole, under electric field action, they can prevent the orderly migration of ionization electric charge, suppress the formation of space charge; The 2nd, the existence of polar material will promote the ionization of impurity in the non-polar polymer to increase, and increase the current carrier in the crosslinked polyethylene like this.Two kinds act on to vie each other in the polymkeric substance and work.When ethylene-acrylate copolymer content by reducing for a long time, can show the effect of best inhibition space charge.In addition, when the content of ethylene-acrylate copolymer was big, it was end to end perhaps to be that more dipole takes place easily, has reduced calculation in the effective charge, can't attract more removable electric charge, thereby space charge increases along with the increase of ethylene-acrylate copolymer content again.
Minashi sugar alcohol adds to as a kind of nucleator makes its spherocrystal regularity that variation has taken place among the PE.Compare with pure PE crystalline state, the quantity of its spherocrystal of PE that contains minashi sugar alcohol is many but size is little, be that minashi sugar alcohol joins the packing structure that has changed the PE molecule among the PE, make that mixed and disorderly crystalline structure is rich in orientation and regularity originally, thereby reduced the formation of grain boundary defects, reduced the generation of the space charge of PE under DC electric field.Water tree also is to form at PE grain boundary defects place, and water is constantly polarized and depolarize down about electric field and water common, and the grain boundary defects place that makes water be penetrated into PE forms the water tree, reduces the insulation life of cable the most at last.
Present chemical crosslink polyethylene insulating plastic used for water tree resistant power cable, as HFDB-4202 NT EC material of Tao Shi etc., all there is following defective: the interior poor lubricity of material, need higher processing temperature, increased precrosslink hidden danger, made material internal have more defective and cavity.
Summary of the invention
The purpose of this invention is to provide a kind of chemical crosslink polyethylene insulating plastic used for water tree resistant power cable and application, to overcome the above-mentioned defective that prior art exists.
Chemical crosslink polyethylene insulating plastic used for water tree resistant power cable of the present invention, component and parts by weight comprise:
100 parts of polyvinyl resins
0.5～4 part of ethylene-acrylate copolymer
1.0～3.0 parts of superoxide
0.02～2 part of compound antioxidant
0.1～0.5 part of nucleator
0.1～1 part of siloxanes
The density of described polyvinyl resin is 0.900～0.950g/cm
3, melting index is 1～10g/10min;
Described ethylene-acrylate copolymer is the multipolymer of ethene and vinylformic acid X ester, and wherein, the X ester is the ester of 1～8 carbon, a kind of in preferred methyl esters, ethyl ester, propyl ester or the butyl ester, and wherein the weight content of acrylate is between 10% to 50%;
Described foreign matter content: on the resin print of the banded thickness 1mm of 1kg, detect and do not allow the impurity particle of particle diameter greater than 250um.
Described superoxide is selected from 2,5-dimethyl-2, two (tert-butyl peroxy base) hexanes of 5-, two tert-butyl peroxy base diisopropylbenzene(DIPB), benzoyl peroxide, 4, one or more in two (tert-butyl peroxide) n-butyl pentanoates of 4-.
Described oxidation inhibitor is pure kind antioxidant and the composite oxidation inhibitor of thio-based oxidation inhibitor, described pure kind antioxidant is that four [3-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester (code name 1101), described thio-based oxidation inhibitor is 4,4 '-thiobis-(the 6-tertiary butyl-3-methylphenol) or 4,4 '-thiobis (6-tertiary butyl meta-cresol, the part by weight of pure kind antioxidant and thio-based oxidation inhibitor is 1:0.9～1.1;
Described nucleator is a minashi sugar alcohol;
Described siloxanes is the polydimethylsiloxane that has end group, and wherein, end group comprises carboxyl, hydroxyl, phenyl, polyethers or vinyl;
The preparation method of chemical crosslink polyethylene insulating plastic used for water tree resistant power cable of the present invention comprises the steps:
With polyvinyl resin, ethylene-acrylate copolymer, superoxide, compound antioxidant, nucleator and siloxanes blend extruding pelletization in screw extrusion press, dry then, can obtain product, blending temperature is 110～120 ℃.
Chemical crosslink polyethylene insulating plastic used for water tree resistant power cable of the present invention, introduced siloxanes, a large amount of experimental results show that, the introducing of siloxanes can work in-process increases the interior oilness of material, thereby can suitably reduce processing temperature, lowered precrosslink hidden danger, this is significant for producing peroxide product; The adding of siloxanes can also reduce the material internal intermolecular stress, increase crystallization degree, reduce the formation in material internal defect and cavity, they and precrosslink are that superoxide decomposes the low molecular impurity that causes generation in advance, all be the initial reason that the water tree produces, the adding of minashi sugar alcohol and nucleator also can reduce these impurity and defect influence.
Novel mesolow chemical crosslink polyethylene insulating plastic used for water tree resistant power cable of the present invention, extrudability and stranding is good, and foreign matter content is little, and the water tree resistant property excellence can be used for the insulation layer or the restrictive coating of mesolow power cable.
Prepared product is compared with the anti-water tree of domestic and international tradition material, and have following advantage: processing characteristics improves, interior oilness improves, and surface property is good, under the same current, the cable extruded velocity is big, processing temperature reduces, and low molecular weight gas produces less, and material internal impurity and defective tail off, degree of crystallinity improves, water tree resistant property improves, and reduces production energy consumption, enhances productivity.
Embodiment
Embodiment 1
Prescription:
100 parts of polyvinyl resins
4 parts of ethylene-acrylate copolymers
1.0 parts of superoxide
2 parts of compound antioxidants
0.1 part of nucleator
0.1 part of siloxanes
The density of polyvinyl resin is 0.900g/cm
3, melting index is 1g/10min;
Ethylene-acrylate copolymer is the multipolymer of ethene and vinylformic acid X ester, wherein the X ester be methyl esters wherein the weight content of acrylate be 10%;
Described foreign matter content: on the resin print of the banded thickness 1mm of 1kg, detect and do not allow the impurity particle of particle diameter greater than 250um.
Superoxide is 2,5-dimethyl-2, two (tert-butyl peroxy base) hexanes of 5-;
Oxidation inhibitor is that four [3-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol esters (code name 1101) and oxidation inhibitor are 4,4 '-thiobis-(the 6-tertiary butyl-3-methylphenol), and part by weight is 1:0.9;
Nucleator is a minashi sugar alcohol;
Siloxanes is the polydimethylsiloxane that has end group, and wherein, end group is a carboxyl;
The preparation method comprises the steps:
With polyvinyl resin, ethylene-acrylate copolymer, superoxide, compound antioxidant, nucleator and siloxanes blend extruding pelletization in screw extrusion press, dry then, can obtain product, blending temperature is 110 ℃.Adopt International Electrotechnical Commission's relevant criterion standard detection, result such as table 1.
| Interventions Requested title and unit | Technical indicator | Assay |
| 1.20 ℃ the time volume specific resistance Ω .m 〉= | 1.0×10 14 | 4.5×10 14 |
| Dielectric strength MV/m 〉= | 30 | 35 |
| Tensile strength Mpa 〉= | 14.5 | 20.6 |
| Elongation at break % 〉= | 400 | 516 |
| 5. heat ageing test test temperature: 135 ℃ ± 2 ℃ maximum velocity of variation % of the maximum velocity of variation % of the aging back draft intensity of test period: 168h aging back elongation at break | ±20 ±20 | 6.1 -1.9 |
| 6. hot elongation test test temperature: 200 ℃ ± 3 ℃ load times: maximum elongation rate % under 15min mechanical pressure: the 0.2Mpa load≤maximum permanent elongation % in cooling back≤ | 80 5 | 50 0 |
| Degree of crosslinking % 〉= | 80 | 85 |
| 8. impact embrittlement temperature (76 ℃) | By | By |
| 20 ℃ of dielectric dissipation factor 50Hz≤ | 5.0×10 -4 | 4.0×10 -4 |
| 20 ℃ of specific inductivity 50Hz≤ | 2.35 | 2.3 |
| 11. water tree growth size %≤ | 50 | 40 |
Embodiment 2
Prescription:
100 parts of polyvinyl resins
0.5 part of ethylene-acrylate copolymer
3.0 parts of superoxide
0.02 part of compound antioxidant
0.5 part of nucleator
1 part of siloxanes
The density of polyvinyl resin is 0.950g/cm
3, melting index is 10g/10min;
Ethylene-acrylate copolymer is the multipolymer of ethene and vinylformic acid X ester, and wherein the X ester is a butyl ester, and wherein the weight content of acrylate is 50%;
Described foreign matter content: on the resin print of the banded thickness 1mm of 1kg, detect and do not allow the impurity particle of particle diameter greater than 250um.
Superoxide is benzoyl peroxide and 4, two (tert-butyl peroxide) n-butyl pentanoates of 4-, and weight ratio is 1:1;
Oxidation inhibitor is four [3-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester (code name 1101) and 4,4 '-thiobis (6-tertiary butyl meta-cresol), and part by weight is 1:1.1;
Nucleator is a minashi sugar alcohol;
Siloxanes is the polydimethylsiloxane that has end group, and wherein, end group is a polyethers;
The preparation method comprises the steps:
With polyvinyl resin, ethylene-acrylate copolymer, superoxide, compound antioxidant, nucleator and siloxanes blend extruding pelletization in screw extrusion press, dry then, can obtain product, blending temperature is 120 ℃.Adopt International Electrotechnical Commission's relevant criterion standard detection, result such as table 2.
| Interventions Requested title and unit | Technical indicator | Assay |
| 1.20 ℃ the time volume specific resistance Ω .m 〉= | 1.0×10 14 | 4.5×10 14 |
| Dielectric strength MV/m 〉= | 30 | 33 |
| Tensile strength Mpa 〉= | 14.5 | 21.2 |
| Elongation at break % 〉= | 400 | 500 |
| 5. heat ageing test test temperature: 135 ℃ ± 2 ℃ maximum velocity of variation % of the maximum velocity of variation % of the aging back draft intensity of test period: 168h aging back elongation at break | ±20 ±20 | 8 -5 |
| 6. hot elongation test test temperature: 200 ℃ ± 3 ℃ load times: maximum elongation rate % under 15min mechanical pressure: the 0.2Mpa load≤maximum permanent elongation % in cooling back≤ | 80 5 | 42 -2 |
| Degree of crosslinking % 〉= | 80 | 87 |
| 8. impact embrittlement temperature (76 ℃) | By | By |
| 20 ℃ of dielectric dissipation factor 50Hz≤ | 5.0×10 -4 | 4.2×10 -4 |
| 20 ℃ of specific inductivity 50Hz≤ | 2.35 | 2.3 |
| 11. water tree growth size %≤ | 50 | 38 |
Claims (8)
1. chemical crosslink polyethylene insulating plastic used for water tree resistant power cable is characterized in that, component and parts by weight comprise:
100 parts of polyvinyl resins
0.5～4 part of ethylene-acrylate copolymer
1.0～3.0 parts of superoxide
0.02～2 part of compound antioxidant
0.1～0.5 part of nucleator
0.1～1 part of siloxanes.
2. chemical crosslink polyethylene insulating plastic used for water tree resistant power cable according to claim 1 is characterized in that, the density of described polyvinyl resin is 0.900～0.950g/cm
3, melting index is 1～10g/10min.
3. chemical crosslink polyethylene insulating plastic used for water tree resistant power cable according to claim 1, it is characterized in that, described ethylene-acrylate copolymer is the multipolymer of ethene and vinylformic acid X ester, wherein the X ester is the ester of 1～8 carbon, and wherein the acrylate weight content is between 10% to 50%.
4. chemical crosslink polyethylene insulating plastic used for water tree resistant power cable according to claim 1; it is characterized in that; described superoxide is selected from 2; 5-dimethyl-2; two (tert-butyl peroxy base) hexanes of 5-, two tert-butyl peroxy base diisopropylbenzene(DIPB), benzoyl peroxide or 4, one or more in two (tert-butyl peroxide) n-butyl pentanoates of 4-.
5. chemical crosslink polyethylene insulating plastic used for water tree resistant power cable according to claim 1, it is characterized in that, described compound antioxidant is pure kind antioxidant and the composite oxidation inhibitor of thio-based oxidation inhibitor, described pure kind antioxidant is that four [3-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester, described thio-based oxidation inhibitor is 4,4 '-thiobis-(the 6-tertiary butyl-3-methylphenol) or 4, (6-tertiary butyl meta-cresol, the part by weight of pure kind antioxidant and thio-based oxidation inhibitor is 1:0.9～1.1 to 4 '-thiobis.
6. chemical crosslink polyethylene insulating plastic used for water tree resistant power cable according to claim 1 is characterized in that, described nucleator is a minashi sugar alcohol.
7. chemical crosslink polyethylene insulating plastic used for water tree resistant power cable according to claim 1 is characterized in that, described siloxanes is the polydimethylsiloxane that has end group, and wherein, end group comprises carboxyl, hydroxyl, phenyl, polyethers or vinyl.
8. according to the application of each described chemical crosslink polyethylene insulating plastic used for water tree resistant power cable of claim 1～8, it is characterized in that, be used for the insulation layer or the restrictive coating of mesolow power cable.
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| CN2008102079332A CN101445628B (en) | 2008-12-26 | 2008-12-26 | Chemical crosslink polyethylene insulating plastic used for water tree resistant power cable and application thereof |
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|---|---|---|---|
| CN2008102079332A CN101445628B (en) | 2008-12-26 | 2008-12-26 | Chemical crosslink polyethylene insulating plastic used for water tree resistant power cable and application thereof |
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| CN101445628A true CN101445628A (en) | 2009-06-03 |
| CN101445628B CN101445628B (en) | 2011-09-07 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101866706A (en) * | 2010-06-08 | 2010-10-20 | 四川大学 | Cross-linked polyethylene power cable nano repairing liquid and repairing method thereof |
| CN105086065A (en) * | 2015-08-14 | 2015-11-25 | 烟台顺隆化工科技有限公司 | Environmentally-friendly cross-linked polyethylene cable insulation material |
| CN107674291A (en) * | 2017-11-15 | 2018-02-09 | 湖州铭腾电力工程科技有限公司 | A kind of preparation method of deep sea cable protective cover material |
| CN107722434A (en) * | 2017-11-15 | 2018-02-23 | 湖州铭腾电力工程科技有限公司 | A kind of deep sea cable protective cover material |
| 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 |
| CN109942933A (en) * | 2019-02-22 | 2019-06-28 | 全球能源互联网研究院有限公司 | A kind of direct current cables Insulation Material and preparation method thereof inhibiting space charge |
| WO2020000341A1 (en) * | 2018-06-29 | 2020-01-02 | Dow Global Technologies Llc | Polyolefin formulation with poly (2-alkyl-2-oxazoline) |
| WO2022087959A1 (en) * | 2020-10-29 | 2022-05-05 | Dow Global Technologies Llc | Polyaminosiloxane water tree repellant for electrical insulation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1223004A (en) * | 1996-06-24 | 1999-07-14 | 联合碳化化学品及塑料技术公司 | Tree resistant cable |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101866706A (en) * | 2010-06-08 | 2010-10-20 | 四川大学 | Cross-linked polyethylene power cable nano repairing liquid and repairing method thereof |
| CN101866706B (en) * | 2010-06-08 | 2011-08-31 | 四川大学 | Cross-linked polyethylene power cable nano repairing liquid and repairing method thereof |
| CN105086065A (en) * | 2015-08-14 | 2015-11-25 | 烟台顺隆化工科技有限公司 | Environmentally-friendly cross-linked polyethylene cable insulation material |
| CN107674291A (en) * | 2017-11-15 | 2018-02-09 | 湖州铭腾电力工程科技有限公司 | A kind of preparation method of deep sea cable protective cover material |
| CN107722434A (en) * | 2017-11-15 | 2018-02-23 | 湖州铭腾电力工程科技有限公司 | A kind of deep sea cable protective cover material |
| WO2020000341A1 (en) * | 2018-06-29 | 2020-01-02 | Dow Global Technologies Llc | Polyolefin formulation with poly (2-alkyl-2-oxazoline) |
| US11939455B2 (en) | 2018-06-29 | 2024-03-26 | Dow Global Technologies Llc | Polyolefin formulation with poly(2-alkyl-2-oxazoline) |
| 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 |
| CN109942933A (en) * | 2019-02-22 | 2019-06-28 | 全球能源互联网研究院有限公司 | A kind of direct current cables Insulation Material and preparation method thereof inhibiting space charge |
| WO2022087959A1 (en) * | 2020-10-29 | 2022-05-05 | Dow Global Technologies Llc | Polyaminosiloxane water tree repellant for electrical insulation |
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| CN101445628B (en) | 2011-09-07 |
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