CN103030865A - 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 the 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 the high-pressure cross-linking cable of twisted polyethylene cable; semiconductive shielding layer is the semiconduction matrix material that is not destroyed for the protection of main insulating layer in the cable; it is divided into internal shield and external shielding layer, and the semiconductive material between handle and conduction sandwich layer and the insulation layer calls internal shield usually.The out semiconductor layer Main Function is to make electric field distribution even in using in cable, reduces strength of electric field, the protection insulation layer.Particularly internal shield directly contacts with conductive copper, and its requirement is higher.Because under the high temperature high-voltage, the conduction sandwich layer can produce cupric ion, thereby has promoted peroxide breakdown, causes the precrosslink of semiconductive shieldin material, finally produces incipient scorch in extruding cable, 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 the forcing machine extruding pelletization, add peroxide cross-linking agent by the imbibition method at last.But extrude in the cable process still to exist easily in the later stage and burn phenomenon and high cost.
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 the 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, extruding in the later stage does not have the incipient scorch phenomenon in the cable process, and reduced plasticizer consumption, reduced cost.
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 in oxidation inhibitor;
0.5 ~ 3 part of linking agent;
0.5 ~ 4 part of dispersion agent;
0.5 ~ 10 part in 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, vinyl acetate between to for plastic (VA) content is 15% ~ 22%(massfraction in described ethylene-vinyl acetate copolymer (EVA) resin), melting index is 2 ~ 4g/10min;
Described graphitized carbon black is the conduction furnace treated black, and oil-absorption(number) (dibutyl phthalate absorption is called again the 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, such as two (the tert-butyl peroxy base sec.-propyl) benzene (BIPB) of 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 '-two [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.
To be oil extract heavy oil residual behind light constituent gasoline, the kerosene or heavy oil through underpressure distillation to described oil fuel extracts remaining residual oil behind the alkene through 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 may further comprise the steps:
The first step: the order of pressing EVA, graphitized carbon black, auxiliary agent adds raw material in the Banbury mixer by proportioning mixing, and 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 the single screw extrusion machine extruding pelletization, particle after the granulation enters high-speed mixer, spray liquid linking agent and mix 5 ~ 10min, then make linking agent infiltrate for some time to material under mixing temperature, cooling, discharging obtain 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 the conductor sandwich layer in squeezing the cable process causes and the incipient scorch phenomenon that causes; In addition, the present invention has also added oil fuel as lubricant, and carbon black and various auxiliary agent are 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 with crosslinkable type semiconduction inner shield its electric property of CABLE MATERIALS and physical and mechanical properties, extruding in the later stage does not have the incipient scorch phenomenon in the cable process, by adding oil fuel, reduce plasticizer consumption, reduced cost.
Embodiment
Embodiment and Comparative Examples prescription
Table 1: embodiment and Comparative Examples prescription
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative Examples 1 | Comparative Examples 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 |
Used EVA is northern organic 18-3 among the embodiment, and the 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 the 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: used dispersion agent and softening agent in each embodiment and the Comparative Examples
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative Examples 1 | Comparative Examples 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 Examples:
EVA, graphitized carbon black, dispersion agent, oxidation inhibitor and softening agent are added in the Banbury mixer successively mixing, melting temperature is controlled at 120 ~ 160 ℃, and mixing time is controlled at 10 ~ 20min; Material after mixing is through the single screw extrusion machine granulation, the extruder screw length-to-diameter ratio is 1:25, each is distinguished temperature and is set as respectively 120 ℃, 135 ℃, 140 ℃, 135 ℃, particle after the granulation enters absorption kettle, spray liquid linking agent and mix 5 ~ 10min with certain speed, temperature is controlled at 70 ℃, then infiltrates 2 ~ 3h under this temperature, 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 Examples 1, Comparative Examples 2 preparations are all measured according to national standard JB/T10738-2007, have reached standard-required.
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative Examples 1 | Comparative Examples 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, the product that has added anti copper agent does not have the incipient scorch phenomenon in the cable extrusion, 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 the carbon black accumulation, thereby reduced the appearance of incipient scorch phenomenon.
The above, it only is exemplary embodiments of the present invention, be not that 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 in the technical scheme scope of the present invention.
Claims (10)
1. crosslinkable type semiconduction inner shield CABLE MATERIALS that the 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.
2. vinyl acetate between to for plastic (VA) content is 15% ~ 22%(massfraction in the crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1, therein ethylene-acetate ethylene copolymer (EVA)), melting index is 2 ~ 4g/10min.
3. to be oil extract heavy oil residual behind light constituent gasoline, the kerosene or heavy oil through underpressure distillation extracts remaining residual oil behind the alkene through catalytic cracking for crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1, wherein said oil fuel.
4. crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1, wherein said anti copper agent is N, N '-two [β-(3,5-di-tert-butyl-hydroxy phenyl) propionyl] hydrazine (MD1024), N, N '-double salicylaldehyde contracting quadrol (C
16H
16N
2O
2) or 3-amino-1,2,4-triazole (C
2H
4N
4).
5. each described crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1-4, wherein graphitized carbon black is the conduction furnace treated black, oil-absorption(number) is 100 ~ 180ml/100g.
6. each described crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1-5, wherein said oxidation inhibitor is Hinered phenols antioxidant, is preferably 4,4 '-thiobis (3 methy 6 tert butyl phenol).
7. each described crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1-6, wherein said linking agent is superoxide, be preferably two (the tert-butyl peroxy base sec.-propyl) benzene (BIPB) of dicumyl peroxide (DCP), benzoyl peroxide (BPO) or 1,3-.
8. each described crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1-7, wherein said dispersion agent is amine hydroxybenzene or erucicamide.
9. each described crosslinkable type semiconduction inner shield CABLE MATERIALS according to claim 1-8, wherein said softening agent are one or more mixture of white oil, paraffin, Zinic stearas, polyethylene wax.
10. the preparation method of described crosslinkable type semiconduction inner shield CABLE MATERIALS comprises the following steps: according to claim 1-9
The first step: the order of pressing EVA, graphitized carbon black, auxiliary agent adds raw material in the Banbury mixer by proportioning mixing, and 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 the single screw extrusion machine extruding pelletization, particle after the granulation enters high-speed mixer, spray liquid linking agent and mix 5 ~ 10min, then make linking agent that material is infiltrated 2 ~ 3h under mixing temperature, cooling, discharging obtain crosslinkable type semiconduction inner shield CABLE MATERIALS.
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| CN103739929A (en) * | 2014-01-10 | 2014-04-23 | 江苏中超电缆股份有限公司 | Graphene-containing polyolefin high semi-conductive shielding material for cable and preparation method thereof |
| CN103980599A (en) * | 2014-05-30 | 2014-08-13 | 江苏德威新材料股份有限公司 | Semiconductive shielding material for high-voltage direct-current cables 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 |
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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 |
| CN103980599A (en) * | 2014-05-30 | 2014-08-13 | 江苏德威新材料股份有限公司 | Semiconductive shielding material for high-voltage direct-current cables 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 |
| CN109251398A (en) * | 2018-07-06 | 2019-01-22 | 浙江万马高分子材料有限公司 | Semi-conductive shielding material for insulation and preparation method thereof |
| 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 |
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