CN103739929B - The polyolefine height semi-conductive screen material of cable graphene-containing and its preparation method - Google Patents
The polyolefine height semi-conductive screen material of cable graphene-containing and its preparation method Download PDFInfo
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Abstract
The present invention discloses polyolefine height semi-conductive screen material and its preparation method of a kind of cable graphene-containing, and the technical problem that solve reduces the volume specific resistance of semi-conductive screen material. The shielding material of the present invention, is made up of following mass percentage: ethylene-vinyl acetate copolymer 83%��90%, Graphene powder 3%��10%, white oil 3%��6%, oxidation inhibitor 0.5%��1%, Zinic stearas 0.3%��0.6%. The preparation method of the present invention, comprises mixing, plasticizing, granulation, and dehydration is dry. The present invention is compared with prior art, Graphene is evenly spread in ethylene-vinyl acetate copolymer, volume specific resistance drops to 30 below �� cm, greatly improve homogenizing electric field, realize the smooth intimate contact of conductor, insulation layer and metal screen layer, improve cable shield homogenizing electric field effect, improve the electric property of cable and the reliability of long-time running, be applicable to the nonmetal screen layer of more than 6kV cable.
Description
Technical field
The present invention relates to the semi-conductive screen material of a kind of mesohigh power transmission and distribution cable material and its preparation method, particularly a kind of cable and its preparation method.
Background technology
Mesohigh cross-linked polyethylene insulated cable (crosslinked cable) is a kind of power cable that in power transmission and distribution field, usage quantity is very big. The semi-conductive screen material of current crosslinked cable mainly adopts and evenly disperses the mode adding graphitized carbon black to make in ethylene-vinyl acetate copolymer EVA, but owing to undesirable by carbon black conductive and that grain graininess is thin not factor affects, the volume specific resistance of semi-conductive screen material is between 40-100 �� cm, the slickness of material surface is good not, thus cable shield homogenizing electric field effect is not ideal enough, the impact of high pressure and extra-high-tension cable is particularly evident.
Summary of the invention
It is an object of the invention to provide the polyolefine height semi-conductive screen material of a kind of cable graphene-containing and its preparation method, the technical problem that solve reduces the volume specific resistance of semi-conductive screen material, it is to increase cable shield homogenizing electric field effect.
The present invention is by the following technical solutions: the polyolefine height semi-conductive screen material of a kind of cable graphene-containing, it is made up of following mass percentage: ethylene-vinyl acetate copolymer 83%��90%, Graphene powder 3%��10%, white oil 3%��6%, oxidation inhibitor 0.5%��1%, Zinic stearas 0.3%��0.6%.
The particle diameter of the Graphene powder of the present invention is not more than 10 ��m.
The oxidation inhibitor of the present invention is 4,4'-thiobis (the 6-tertiary butyl-3-methylphenol).
The polyolefine height semi-conductive screen material of the cable graphene-containing of the present invention is made up of following mass percentage: ethylene-vinyl acetate copolymer 85%��88%, Graphene powder 7%��8.5%, white oil 5%��5.4%, oxidation inhibitor 0.6%��0.7%, Zinic stearas 0.4%��0.5%.
The ethylene-vinyl acetate copolymer (EVA) 86% of the present invention, Graphene powder 8%.
A preparation method for the polyolefine height semi-conductive screen material of cable graphene-containing, comprises the following steps:
One, mix, by mass percentage, by ethylene-vinyl acetate copolymer (EVA) 83%��90%, Graphene powder 3%��10%, white oil 3%��6%, oxidation inhibitor 0.5%��1%, Zinic stearas 0.3%��0.6%, it is uniformly mixed 1-2 minute with the rotating speed of 150-200rpm, obtains the compound mixed;
Two, plastifying, compound carries out first time plasticizing, screw speed is 180-220rpm, and the temperature in each region, plasticizing zone is: 1 85-90 DEG C, district, 2 105-110 DEG C, districts, 3 115-125 DEG C, districts, 4 100-105 DEG C, districts, 5 90-95 DEG C, districts; Carrying out second time plasticizing again, screw speed is 120-150rpm, and the temperature in each region, extrusion molding district is: 1 85-90 DEG C, district, 2 85-90 DEG C, districts, head 105-110 DEG C, obtains plasticizing material;
Three, granulation, is 105-115 DEG C by plasticizing material in temperature, when pressure is 5.0-7.0MPa, makes the cylindrical particle of diameter 3.5mm �� height 3mm, purify waste water and be cooled to room temperature;
Four, dewater, cylindrical particle is 1080-1200rpm at rotating speed, when the time is 15-25min, dewaters;
Five, the material after dewatering is dry through ebullated bed, and temperature is 45-50 DEG C, obtains the polyolefine height semi-conductive screen material of cable graphene-containing.
The method steps five of the present invention obtains the polyolefine height semi-conductive screen material of cable graphene-containing, naturally cools to room temperature.
The method steps one ethylene-vinyl acetate copolymer (EVA) 85%��88% of the present invention, Graphene powder 7%��8.5%, white oil 5%��5.4%, oxidation inhibitor 0.6%��0.7%, Zinic stearas 0.4%��0.5%.
The method steps one ethylene-vinyl acetate copolymer (EVA) 86% of the present invention, Graphene powder 8%.
The preparation method of the present invention adopts the reciprocating mixing extrusion granulating unit of WF140-180 type.
The present invention is compared with prior art, Graphene is evenly spread in ethylene-vinyl acetate copolymer EVA resin, reduce the volume specific resistance of semi-conductive screen material, its volume specific resistance drops to 30 below �� cm, greatly improve homogenizing electric field, it is achieved the smooth intimate contact of conductor, insulation layer and metal screen layer, it is to increase cable shield homogenizing electric field effect, improve the electric property of cable and the reliability of long-time running, it is applicable to the nonmetal screen layer of more than 6kV cable.
Accompanying drawing explanation
Fig. 1 is preparation method's schema of the polyolefine height semi-conductive screen material of cable graphene-containing of the present invention.
Embodiment
Polyolefine height semiconduction (semiconduction) the shielding material of the cable graphene-containing of the present invention, it is made up of following mass percentage: ethylene-vinyl acetate copolymer EVA83%��90%, Graphene powder 3%��10%, white oil 3%��6%, oxidation inhibitor 0.5%��1%, Zinic stearas 0.3%��0.6%.
The particle diameter of described Graphene powder is not more than 10 ��m.
Described oxidation inhibitor is 4,4'-thiobis (the 6-tertiary butyl-3-methylphenol).
Polyolefine height semiconduction (semiconduction) the shielding material of the cable graphene-containing of the present invention, at the volume specific resistance��30 �� cm of 20 DEG C.
The preparation method of the polyolefine height semi-conductive screen material (shielding material) of the cable graphene-containing of the present invention, as shown in Figure 1, comprises the following steps:
One, mixing, by ethylene-vinyl acetate copolymer EVA, particle diameter is not more than the Graphene powder of 10 ��m, white oil, oxidation inhibitor 4, 4'-thiobis (the 6-tertiary butyl-3-methylphenol) and Zinic stearas, it is respectively charged into raw material storehouse through elevating hopper, with weight-loss metering scale consecutive weighings, under room temperature (20 DEG C), by mass percentage, by ethylene-vinyl acetate copolymer EVA83%��90%, Graphene powder 3%��10%, white oil 3%��6%, oxidation inhibitor 0.5%��1%, Zinic stearas 0.3%��0.6%, join in the mixing district of the reciprocating mixing extrusion granulating unit of WF140-180 type of sub-chemical industry outfit company limited of Nanjing section, it is uniformly mixed 1-2 minute with the rotating speed of 150-200rpm, mix, obtain the compound mixed.
The reciprocating mixing extrusion granulating unit of WF140-180 type that the present embodiment adopts is a set of multi-functional continuous device; it is provided with host groups and auxiliary unit two portions; host groups comprises reciprocating mixing district; plasticizing zone, extrusion molding district and granulation zone; auxiliary unit comprises centrifuge and ebullated bed, therefore whole mixing, plastify with extrude, granulation, dehydration all complete on this unit.
Ethylene-vinyl acetate copolymer EVA is as the base-material of (shielding material).
Graphene powder is as conductive filler material. Graphene has extremely good conductivity, as the function ingredients material of high semiconduction (semiconduction) shielding material, makes shielding material become semiconductive material, by the selection to Graphene amount, meets shielding and expects the volume specific resistance��30 �� cm at 20 DEG C.
White oil, as lubricant and assisted demoulding agent, makes the processing characteristics of shielding material be protected.
Oxidation inhibitor suppresses or delays to shield the oxidative degradation of material, extends the work-ing life of cable.
Zinic stearas, as lubricant, reduces the frictional force that the mechanical interior contact with Preparation equipment in the course of processing is expected in shielding, it is to increase the mobility of shielding material.
Two, plastify, carry out twice plasticizing continuously, each material in the mixing component that step one obtains is uniformly dispersed after being melted by physical force, forms stable equal phase component. Compound being sent into the plasticizing zone of reciprocating mixing extrusion granulating unit, carries out first time plasticizing, screw speed is 180-220rpm, and the temperature in each region, plasticizing zone is such as table 1. Heat up 1 hour in advance in plasticizing zone, the temperature (temperature of extrusion molding district, granulation zone also so heats up) heated up and reach in table 1 in Shi Ge district.
Table 1 first time plasticizing plasticizing zone temperature (DEG C)
| 1st district | 2nd district | 3rd district | 4th district | 5th district |
| 85-90 | 105-110 | 115-125 | 100-105 | 90-95 |
Material after first time plasticizing is admitted to the extrusion molding district of reciprocating mixing extrusion granulating unit, carries out second time plasticizing, obtains plasticizing material, and screw speed is 120-150rpm, and the temperature in each region, extrusion molding district is such as table 2.
Table 2 second time plasticizing extrusion molding district temperature (DEG C)
| 1st district | 2nd district | Head |
| 85-90 | 85-90 | 105-110 |
Three, granulation, sends into plasticizing material the granulation zone of reciprocating mixing extrusion granulating unit, is 105-115 DEG C in temperature, when pressure is 5.0-7.0MPa, makes the cylindrical particle of diameter 3.5mm �� height 3mm, purify waste water and be cooled to room temperature. Purify waste water as general softening water.
Four, dewater, cylindrical particle is sent into the centrifuge of reciprocating mixing extrusion granulating unit, is 1080-1200rpm at rotating speed, when the time is 15-25min, dewaters.
Five, screen, weigh, pack; the ebullated bed that material after dehydration sends into reciprocating mixing extrusion granulating unit through storage hopper is dry; temperature is 45-50 DEG C; the screening of particle is carried out by vibratory screening apparatus; removing powder, the particle that granularity does not meet diameter 3.5mm �� height 3mm filters out, and obtains the polyolefine height semi-conductive screen material of cable graphene-containing; naturally cool to room temperature, packaging warehouse-in after weighing.
Embodiment 1-5 adopts the polyolefine height semi-conductive screen material of the cable graphene-containing that the inventive method prepares, and by GB/T1033-2008 test density, by GB/T1040-2006 test tensile strength, tests 20 DEG C of volume specific resistances by GB/T3048.3-2007. Carry out air heat ageing test, by GB/T1040-2006 test tensile strength velocity of variation, by GB/T2951.12-2008 elongation at break velocity of variation. As a comparison case, carrying out test comparison by above-mentioned identical method with shielding material YPJ-10 in the 10KV semiconduction of prior art, test result is in table 3. YPJ-10 adds graphitized carbon black as conductive filler material in ethylene-vinyl acetate copolymer EVA.
Embodiment 1,
One, mass percentage is: EVA83%, Graphene powder 10%, white oil 6%, oxidation inhibitor 0.5%, Zinic stearas 0.5%. It is uniformly mixed 2 minutes with the rotating speed of 150rpm.
Two, first time plasticizing, screw speed controls at 180rpm/min, and plasticization temperature is for the first time:
| 1st district | 2nd district | 3rd district | 4th district | 5th district |
| 85 | 105 | 115 | 100 | 90 |
Second time plasticizing, screw speed is 120rpm, and second time plasticization temperature is:
| 1st district | 2nd district | Head |
| 85 | 85 | 105 |
Three, temperature is 105 DEG C, and pressure is 5.0MPa, makes the cylindrical particle of diameter 3.5mm �� height 3mm.
Four, rotating speed is 1080rmp, and the time is 23min, dehydration.
Five, ebullated bed is dry, 50 DEG C of dryings, cooling, and screening, obtains the polyolefine height semi-conductive screen material of cable graphene-containing, packaging warehouse-in after weighing.
Embodiment 2,
One, mass percentage is: EVA resin 86%, Graphene powder 7%, white oil 5.4%, oxidation inhibitor 1%, Zinic stearas 0.6%. It is uniformly mixed 1 minute with the rotating speed of 200rpm.
Two, first time plasticizing, screw speed controls at 200rpm/min, and plasticization temperature is for the first time:
| 1st district | 2nd district | 3rd district | 4th district | 5th district |
| 87 | 108 | 120 | 103 | 92 |
Second time plasticizing, screw speed is 150rpm, and second time plasticization temperature is:
| 1st district | 2nd district | Head |
| 87 | 89 | 107 |
Three, temperature is 107 DEG C, and pressure is 6.5MPa, makes the cylindrical particle of diameter 3.5mm �� height 3mm.
Four, rotating speed is 1140rpm, and the time is 25min, dehydration.
Five, ebullated bed is dry, 48 DEG C of dryings, cooling, and screening, obtains the polyolefine height semi-conductive screen material of cable graphene-containing, packaging warehouse-in after weighing.
Embodiment 3,
One, mass percentage is: EVA resin 88%, Graphene powder 8%, white oil 3%, oxidation inhibitor 0.7%, Zinic stearas 0.3%. It is uniformly mixed 1 minute with the rotating speed of 200rpm.
Two, first time plasticizing, screw speed controls at 200rpm/min, and plasticization temperature is for the first time:
| 1st district | 2nd district | 3rd district | 4th district | 5th district |
| 90 | 110 | 125 | 105 | 90 |
Second time plasticizing, screw speed is 150rpm, and second time plasticization temperature is:
| 1st district | 2nd district | Head |
| 90 | 90 | 110 |
Three, temperature is 110 DEG C, and pressure is 7.0MPa, makes the cylindrical particle of diameter 3.5mm �� height 3mm.
Four, rotating speed is 1140rmp, and the time is 22min, dehydration.
Five, ebullated bed is dry, 47 DEG C of dryings, cooling, and screening, obtains the polyolefine height semi-conductive screen material of cable graphene-containing, packaging warehouse-in after weighing.
Embodiment 4,
One, mass percentage is: EVA resin 90%, Graphene powder 3%, white oil 6%, oxidation inhibitor 0.6%, Zinic stearas 0.4%. It is uniformly mixed 2 minutes with the rotating speed of 180rpm.
Two, first time plasticizing, screw speed controls at 220rpm/min, and plasticization temperature is for the first time:
| 1st district | 2nd district | 3rd district | 4th district | 5th district |
| 88 | 107 | 120 | 105 | 95 |
Second time plasticizing, screw speed is 140rpm, and second time plasticization temperature is:
| 1st district | 2nd district | Head |
| 88 | 89 | 110 |
Three, temperature is 110 DEG C, and pressure is 6.7MPa, makes the cylindrical particle of diameter 3.5mm �� height 3mm.
Four, rotating speed is 1170rmp, and the time is 15min, dehydration.
Five, ebullated bed is dry, 50 DEG C of dryings, cooling, and screening, obtains the polyolefine height semi-conductive screen material of cable graphene-containing, packaging warehouse-in after weighing.
Embodiment 5,
One, mass percentage is: EVA resin 85%, Graphene powder 8.5%, white oil 5%, oxidation inhibitor 1%, Zinic stearas 0.5%. It is uniformly mixed 1.5 minutes with the rotating speed of 180rpm.
Two, first time plasticizing, screw speed controls at 180rpm/min, and plasticization temperature is for the first time:
| 1st district | 2nd district | 3rd district | 4th district | 5th district |
| 90 | 110 | 125 | 105 | 95 |
Second time plasticizing, screw speed is 150rpm, and second time plasticization temperature is:
| 1st district | 2nd district | Head |
| 90 | 90 | 110 |
Three, temperature is 115 DEG C, and pressure is 5.5MPa, makes the cylindrical particle of diameter 3.5mm �� height 3mm.
Four, rotating speed is 1200rmp, and the time is 17min, dehydration.
Five, ebullated bed is dry, 45 DEG C of dryings, cooling, and screening, obtains the polyolefine height semi-conductive screen material of cable graphene-containing, packaging warehouse-in after weighing.
The performance test results of table 3 embodiment 1-5, comparative example
By contrast it may be seen that the polyolefine height semi-conductive screen material of the cable graphene-containing of the present invention, volume specific resistance and mechanical property are better than in the semiconduction of prior art to shield material YPJ-10.
Graphene has excellent conductivity, good mechanical property and heat conductivility, adopt the Graphene of granularity below 10 microns, evenly spread in EVA resin, the polyolefine height semi-conductive screen material of the cable graphene-containing prepared, its volume specific resistance can drop to 30 below �� cm, after adopting the carbon black compound semi-conductive screen material that the polyolefine height semi-conductive screen material of the cable graphene-containing of the present invention replaces prior art, can greatly improve homogenizing electric field and realize conductor, the technique effect of the smooth intimate contact of insulation and metal screen layer, may be used for the nonmetal screen layer of 6kV and above cable, improve the electric property of cable and the reliability of long-time running.
Instant invention overcomes prior art carbon black compound semi-conductive screen material because carbon black conductive is not ideal enough and cable quality is affected problem by the factor of particle fineness, especially there is the excellent technique effect of volume specific resistance��30 �� cm at the polyolefine height semi-conductive screen material of 20 DEG C of cable graphene-containings, except significantly improving the conductivity of semi-conductive screen material product, its slipperiness, mechanical property, stability is all improved compared with the carbon black compound semi-conductive screen material of prior art with homogeneity, and expressing technique performance improves, extrusion efficiency is prior art material raising 7%-15% relatively. the shielding material of prior art is when 65 forcing machines are extruded, temperature is arranged on 90-100 DEG C, screw speed is at 26rpm/min, melt and it is pressed in 15MPa, gel quantity per hour is at 20kg, and adopts the inventive method to prepare the polyolefine height semi-conductive screen material of cable graphene-containing, when the setting of same temperature, same screw speed and molten pressure, its gel quantity per hour is 21.4-23kg, and extrusion efficiency significantly improves.
Claims (2)
1. a preparation method for the polyolefine height semi-conductive screen material of cable graphene-containing, comprises the following steps:
One, mix, by mass percentage, ethylene-vinyl acetate copolymer EVA85%��88%, Graphene powder 7%��8.5%, white oil 5%��5.4%, oxidation inhibitor 0.6%��0.7%, Zinic stearas 0.4%��0.5%, it is uniformly mixed 1-2 minute with the rotating speed of 150-200rpm, obtains the compound mixed;
Two, plastifying, compound carries out first time plasticizing, screw speed is 180-220rpm, and the temperature in each region, plasticizing zone is: 1 85-90 DEG C, district, 2 105-110 DEG C, districts, 3 115-125 DEG C, districts, 4 100-105 DEG C, districts, 5 90-95 DEG C, districts; Carrying out second time plasticizing again, screw speed is 120-150rpm, and the temperature in each region, extrusion molding district is: 1 85-90 DEG C, district, 2 85-90 DEG C, districts, head 105-110 DEG C, obtains plasticizing material;
Three, granulation, is 105-115 DEG C by plasticizing material in temperature, when pressure is 5.0-7.0MPa, makes the cylindrical particle of diameter 3.5mm �� height 3mm, purify waste water and be cooled to room temperature;
Four, dewater, cylindrical particle is 1080-1200rpm at rotating speed, when the time is 15-25min, dewaters;
Five, the material after dewatering is dry through ebullated bed, and temperature is 45-50 DEG C, obtains the polyolefine height semi-conductive screen material of cable graphene-containing, naturally cools to room temperature;
Described preparation method adopts the reciprocating mixing extrusion granulating unit of WF140-180 type;
The particle diameter of described Graphene powder is not more than 10 ��m; Described oxidation inhibitor is 4,4'-thiobis (the 6-tertiary butyl-3-methylphenol).
2. the preparation method of the polyolefine height semi-conductive screen material of cable graphene-containing according to claim 1, it is characterised in that: described step one ethylene-vinyl acetate copolymer EVA86%, Graphene powder 8%.
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| 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 |
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