CN103030865B - Cross-linking semiconductive inner shielding cable material for 35KV crosslinked polyethylene cable and preparation method thereof - Google Patents
Cross-linking semiconductive inner shielding cable material for 35KV crosslinked polyethylene cable and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a cross-linking semiconductive inner shielding cable material for a 35KV crosslinked polyethylene cable. A preparation method of the cross-linking semiconductive inner shielding cable material comprises the following steps of: uniformly mixing additives such as EVA (Ethylene-vinyl Acetate) resin, conductive carbon black, an antioxidant, a dispersant, a plasticizer, fuel oil, a copper resistance agent and the like firstly, then extruding the mixture by an extruder to carry out granulation, and finally, adding a peroxide crosslinking agent through an imbibition method. According to the cross-linking semiconductive inner shielding cable material disclosed by the invention, the copper resistance agent is added, thus avoiding the scorching phenomenon caused by pre-crosslinking due to copper ions produced by a conductor core layer in the cable extruding process; and in addition, the fuel oil is also added in the cross-linking semiconductive inner shielding cable material as a lubricant, so that the carbon black and the various additives can be uniformly dispersed in the EVA, thus reducing the dosage of the plasticizer and lowering the cost.
Description
Technical field
The present invention relates to polymer insulation and conducing composite material technical field, relating in particular to is a kind of crosslinkable type semiconduction inner shield material of the crosslinked polyethylene of using for 35KV power cable.
Background technology
At present; crosslinked polyethylene is as the preferred material of mesohigh power cable insulation; semiconductive shielding layer is an especially indispensable part in high-pressure cross-linking cable of twisted polyethylene cable; semiconductive shielding layer is the semiconduction matrix material not being destroyed for the protection of main insulating layer in cable; it is divided into internal shield and external shielding layer, and the semiconductive material between handle and conduction sandwich layer and insulation layer calls internal shield conventionally.In using in cable, out semiconductor layer Main Function is to make electric field distribution even, reduces strength of electric field, protection insulation layer.Particularly internal shield, directly contacts with conductive copper, and its requirement is higher.Because under high temperature high-voltage, conduction sandwich layer can produce cupric ion, thereby has promoted peroxide breakdown, causes the precrosslink of semiconductive shieldin material, finally in extruding cable, produces incipient scorch, easily causes voltage breakdown.
China Patent Publication No. CN101891916A has introduced a kind of peroxide crosslinked type semi-conductive screen material for crosslinked cable conductor, first the auxiliary agents such as EVA resin, graphitized carbon black, oxidation inhibitor, softening agent are mixed in Banbury mixer, then through forcing machine extruding pelletization, finally by imbibition method, add peroxide cross-linking agent.But still easily exist and burn phenomenon and high cost in extruding cable process in the later stage.
Summary of the invention
The object of the present invention is to provide a kind of crosslinkable type semiconduction inner shield material of using for 35KV twisted polyethylene cable and preparation method thereof, this crosslinkable type semiconduction inner shield CABLE MATERIALS electric property and physical and mechanical properties are all up to standard, in extruding cable process in the later stage, there is no incipient scorch phenomenon, and reduced plasticizer consumption, reduced costs.
The present invention is achieved through the following technical solutions:
The invention provides the crosslinkable type semiconduction inner shield CABLE MATERIALS that a kind of 35KV twisted polyethylene cable is used, it comprises the component of following parts by weight:
45 ~ 60 parts of ethylene-vinyl acetate copolymers (EVA);
25 ~ 45 parts of graphitized carbon blacks;
0.2 ~ 2 part, oxidation inhibitor;
0.5 ~ 3 part of linking agent;
0.5 ~ 4 part of dispersion agent;
0.5 ~ 10 part, softening agent;
0.05 ~ 0.5 part of anti copper agent;
2 ~ 8 parts of oil fuel;
Except said components, also can select to add as required other components.
Wherein, in described ethylene-vinyl acetate copolymer (EVA) resin, vinyl acetate between to for plastic (VA) content is 15% ~ 22%(massfraction), melting index is 2 ~ 4g/10min;
Described graphitized carbon black is conduction furnace treated black, and oil-absorption(number) (dibutyl phthalate absorption is called again DBP value) is 100 ~ 180ml/100g;
Described oxidation inhibitor is Hinered phenols antioxidant, for example 4, and 4 '-thiobis (3 methy 6 tert butyl phenol) (claiming again antioxidant 300);
Described linking agent is superoxide, (tert-butyl peroxy base sec.-propyl) benzene (BIPB) as two in dicumyl peroxide (DCP), benzoyl peroxide (BPO) or 1,3-;
Described dispersion agent is amine hydroxybenzene or erucicamide;
Described softening agent is one or more mixture of white oil, paraffin, Zinic stearas, polyethylene wax.
Described anti copper agent is MD1024 ﹛ N, N '-bis-[β-(3,5-di-tert-butyl-hydroxy phenyl) propionyl] Jing ﹜, N, N '-double salicylaldehyde contracting quadrol (C
16h
16n
2o
2) or 3-amino-1,2,4-triazole (C
2h
4n
4) etc.
The described oil fuel heavy oil that to be oil after light constituent gasoline, kerosene are extracted in underpressure distillation residual or heavy oil remaining residual oil after alkene is extracted in catalytic cracking, be characterized in that viscosity is larger, complicated components, generally contains non-hydrocarbon compound, colloid etc., commonly uses and makees industrial oil fuel.The present invention adopts cheap oil fuel as lubricant, has reduced the consumption of softening agent, has reduced cost.
The present invention also provides the preparation method of the crosslinkable type semiconduction inner shield CABLE MATERIALS that a kind of 35KV twisted polyethylene cable uses, and comprises the following steps:
The first step: by the order of EVA, graphitized carbon black, auxiliary agent, raw material is added in Banbury mixer mixingly by proportioning, wherein auxiliary agent comprises oil fuel, anti copper agent, dispersion agent, oxidation inhibitor and softening agent; Melting temperature is controlled at 120 ~ 160 ℃, and mixing time is controlled at 10 ~ 20min;
Second step: the material after mixing is through single screw extrusion machine extruding pelletization, particle after granulation enters high-speed mixer, spray liquid linking agent and mix 5 ~ 10min, then under mixing temperature, make linking agent infiltrate for some time to material, cooling, discharging obtains cross-linking type EVA semiconduction inner shield CABLE MATERIALS.
The effect of invention:
The present invention has added anti copper agent, the precrosslink that the cupric ion of having avoided being produced by conductor sandwich layer in squeezing cable process causes and the incipient scorch phenomenon that causes; In addition, the present invention has also added oil fuel as lubricant, can make carbon black and various auxiliary agent be uniformly dispersed in EVA, has reduced the consumption of softening agent, has reduced cost.
35KV twisted polyethylene cable of the present invention all reaches the technical requirements of JB/T10738-2007 by crosslinkable type semiconduction inner shield its electric property of CABLE MATERIALS and physical and mechanical properties, in extruding cable process in the later stage, there is no incipient scorch phenomenon, by adding oil fuel, reduce plasticizer consumption, reduced cost.
Embodiment
Embodiment and comparative example formula
Table 1: embodiment and comparative example formula
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 |
| EVA | 50 | 52 | 54 | 52 | 52 |
| Graphitized carbon black | 38 | 36 | 32 | 36 | 36 |
| Dispersion agent | 2 | 1.8 | 1.6 | 1.8 | 1.8 |
| Oxidation inhibitor | 1 | 1.3 | 1.6 | 1.3 | 1.3 |
| Softening agent | 4.32 | 3 | 3.68 | 3.1 | 7 |
| Linking agent | 1.6 | 1.8 | 2.0 | 1.8 | 1.8 |
| Anti copper agent | 0.08 | 0.10 | 0.12 | 0 | 0.1 |
| Oil fuel | 3 | 4 | 5 | 4 | 0 |
In embodiment, EVA used is northern organic 18-3, and MFR value is 2 ~ 3g/10min, and VA content is between 17% ~ 19%;
Graphitized carbon black is graphitized carbon black JE6900, and producer is rubber in Taiwan, and its DBP value is 100 ~ 145 ml/100g;
Oxidation inhibitor is antioxidant 300;
Linking agent is DCP;
Anti copper agent is MD1024, and manufacturer is vapour Bagong department.
Table 2: dispersion agent used and softening agent in each embodiment and comparative example
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 |
| Dispersion agent | Amine hydroxybenzene | Amine hydroxybenzene | Erucicamide | Amine hydroxybenzene | Amine hydroxybenzene |
| Softening agent | Polyethylene wax, white oil | Zinic stearas; Polyethylene wax, white oil, paraffin | Zinic stearas; Polyethylene wax | Zinic stearas; Polyethylene wax, white oil, paraffin | Zinic stearas; Polyethylene wax, white oil, paraffin |
The production technique of embodiment and comparative example:
EVA, graphitized carbon black, dispersion agent, oxidation inhibitor and softening agent are added in Banbury mixer successively mixing, melting temperature is controlled at 120 ~ 160 ℃, and mixing time is controlled at 10 ~ 20min; Material after mixing is through single screw extrusion machine granulation, extruder screw length-to-diameter ratio is 1:25, each district's temperature is set as respectively 120 ℃, 135 ℃, 140 ℃, 135 ℃, particle after granulation enters absorption kettle, spray liquid linking agent and mix 5 ~ 10min with certain speed, temperature is controlled at 70 ℃, then at this temperature, infiltrates 2 ~ 3h, and last cooling discharging obtains cross-linking type EVA semi-conductive screen CABLE MATERIALS.
Electric property and the physical and mechanical properties of the shielding material of embodiment 1～3 and comparative example 1, comparative example 2 preparations are all measured according to national standard JB/T10738-2007, have reached standard-required.
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 |
| Volume specific resistance Ω .cm in the time of 20 ℃ | 57 | 68 | 89 | 66 | 68 |
| Tensile strength (MPa) | 19.5 | 25.2 | 28.3 | 24.8 | 25.9 |
| Elongation at break (%) | 182 | 188 | 194 | 192 | 190 |
| Heat is extended elongation (%) | 47 | 57 | 72 | 54 | 55 |
| Heat is extended tension set (%) | 5 | 9 | 11 | 9 | 8 |
| Squeeze cable incipient scorch situation | Nothing | Nothing | Nothing | Have | Nothing |
| Cost | Low | Low | Low | Low | High |
Above embodiment can learn that special-effect of the present invention is: contrast and the product that does not add anti copper agent, added the product of anti copper agent in cable extrusion, there is no incipient scorch phenomenon, and its properties has also reached the requirement of industry standard, added in addition oil fuel, not only reduced cost, and increased the lubricated of storeroom, made carbon black and each auxiliary agent in EVA, disperse more even, prevent carbon black accumulation, thereby reduced the appearance of incipient scorch phenomenon.
The above, it is only exemplary embodiments of the present invention, not technical scope of the present invention is imposed any restrictions, any trickle modification, equivalent variations and modification that every foundation technical spirit of the present invention is made above enforcement, all still belong within the scope of technical scheme of the present invention.
Claims (9)
1. the crosslinkable type semiconduction inner shield CABLE MATERIALS that 35KV twisted polyethylene cable is used, is characterized in that: comprise by weight following component:
A. ethylene-vinyl acetate copolymer: 45 ~ 60 parts;
B. graphitized carbon black: 25 ~ 45 parts;
C. oxidation inhibitor: 0.2 ~ 2 part;
D. linking agent: 0.5 ~ 3 part;
E. dispersion agent: 0.5-4 part;
F. softening agent: 0.5-10 part;
G. anti copper agent: 0.05 ~ 0.5 part; With
H. oil fuel: 2 ~ 8 parts;
Wherein said anti copper agent is N, N '-double salicylaldehyde contracting quadrol or 3-amino-1,2,4-triazole;
The wherein said oil fuel heavy oil that to be oil after light constituent gasoline, kerosene are extracted in underpressure distillation residual or heavy oil remaining residual oil after alkene is extracted in catalytic cracking;
Wherein said dispersion agent is amine hydroxybenzene or erucicamide.
2. crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1, in therein ethylene-acetate ethylene copolymer (EVA), vinyl acetate between to for plastic (VA) content is 15% ~ 22%(massfraction), melting index is 2 ~ 4g/10min.
3. crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1, wherein graphitized carbon black is conduction furnace treated black, oil-absorption(number) is 100 ~ 180ml/100g.
4. crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1, wherein said oxidation inhibitor is Hinered phenols antioxidant.
5. crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 4, wherein said oxidation inhibitor is 4,4 '-thiobis (3 methy 6 tert butyl phenol).
6. crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1, wherein said linking agent is superoxide.
7. crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 6, wherein said linking agent is two (the tert-butyl peroxy base sec.-propyl) benzene (BIPB) of dicumyl peroxide (DCP), benzoyl peroxide (BPO) or 1,3-.
8. crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1, wherein said softening agent is one or more mixture of white oil, paraffin, Zinic stearas, polyethylene wax.
9. according to the preparation method of the crosslinkable type semiconduction inner shield CABLE MATERIALS described in claim 1-8, comprise the following steps:
The first step: by the order of EVA, graphitized carbon black, auxiliary agent, raw material is added in Banbury mixer mixingly by proportioning, wherein auxiliary agent comprises oil fuel, anti copper agent, dispersion agent, oxidation inhibitor and softening agent; Melting temperature is controlled at 120 ~ 160 ℃, and mixing time is controlled at 10 ~ 20min;
Second step: the material after mixing is through single screw extrusion machine extruding pelletization, particle after granulation enters high-speed mixer, spray liquid linking agent and mix 5 ~ 10min, then under mixing temperature, making linking agent infiltrate 2 ~ 3h to material, cooling, discharging obtains crosslinkable type semiconduction inner shield CABLE MATERIALS.
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| CN103739929B (en) * | 2014-01-10 | 2016-06-01 | 江苏中超电缆股份有限公司 | The polyolefine height semi-conductive screen material of cable graphene-containing and its preparation method |
| CN103980599B (en) * | 2014-05-30 | 2016-03-02 | 江苏德威新材料股份有限公司 | A kind of high voltage direct current cable semi-conductive shielding material and preparation method thereof |
| CN105322304A (en) * | 2015-11-30 | 2016-02-10 | 国网河南偃师市供电公司 | Crosslinked cable butt-joint device |
| CN105542276A (en) * | 2016-01-05 | 2016-05-04 | 四川金开特种电线电缆有限公司 | Technology for preparing cable material through energy-saving post-absorption method |
| CN106147001A (en) * | 2016-07-22 | 2016-11-23 | 江阴市海江高分子材料有限公司 | A kind of high fluidity Quick cross-linking semiconductive shieldin material and preparation method thereof |
| CN108435132A (en) * | 2018-04-02 | 2018-08-24 | 广东石油化工学院 | A kind of auxiliary agent improving fluid catalytic cracking product yield |
| CN109251398B (en) * | 2018-07-06 | 2021-04-30 | 浙江万马高分子材料有限公司 | Semi-conductive shielding material for insulation and preparation method thereof |
| CN112500631B (en) * | 2020-11-08 | 2022-12-16 | 江苏北化新橡新材料科技有限公司 | Halogen-free flame-retardant cable material with electromagnetic shielding function and preparation method thereof |
| CN114316421A (en) * | 2021-12-28 | 2022-04-12 | 高邮市金国电缆材料厂有限公司 | Strippable semiconductive shielding material for crosslinked polyethylene insulated cable and preparation method thereof |
| CN114940784A (en) * | 2022-03-16 | 2022-08-26 | 重庆大学 | Water-blocking cable semiconductive shielding layer material and preparation method thereof |
| CN114989524B (en) * | 2022-08-01 | 2022-11-08 | 南京中超新材料股份有限公司 | Cross-linked bonding type conductor shielding material and preparation method thereof |
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| CN101817950A (en) * | 2010-04-29 | 2010-09-01 | 上海科悦高分子材料有限公司 | Screen material for 35kV grade high/medium voltage crosslinked cable conductor layer and preparation method thereof |
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| CN102070816A (en) * | 2010-12-29 | 2011-05-25 | 王莉 | Polyethylene anti-copper functional masterbatch |
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| CN1170734A (en) * | 1997-06-24 | 1998-01-21 | 中山大学 | Components and producing method of positive-temperature-coefficient conductive polymer composite material |
| CN101817950A (en) * | 2010-04-29 | 2010-09-01 | 上海科悦高分子材料有限公司 | Screen material for 35kV grade high/medium voltage crosslinked cable conductor layer and preparation method thereof |
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