CN112280231A - Shielding material for polypropylene-based thermoplastic cable and preparation method thereof - Google Patents
Shielding material for polypropylene-based thermoplastic cable and preparation method thereof Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/017—Additives being an antistatic agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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Abstract
The invention provides a shielding material for a polypropylene-based thermoplastic cable and a preparation method thereof, wherein the shielding material for the polypropylene-based thermoplastic cable comprises the following components in parts by weight: 100 parts of ethylene-propylene block copolymer polypropylene, 3-20 parts of conductive carbon black, 0.5-1.5 parts of high-conductivity graphene, 0.5-1.5 parts of coupling agent and 1.4-4.5 parts of auxiliary agent, wherein the auxiliary agent comprises an antioxidant, a lubricant and an anti-caking agent; the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 5-30%. The shielding material for the polypropylene-based thermoplastic cable has excellent conductivity and mechanical properties, and the shielding material for the polypropylene-based thermoplastic cable still has excellent conductivity and mechanical properties under high temperature conditions by matching with ethylene-propylene block copolymer polypropylene, conductive carbon black and high-conductivity graphene.
Description
Technical Field
The invention relates to the field of cable protection materials, in particular to a shielding material for a polypropylene-based thermoplastic cable and a preparation method thereof.
Background
The medium-high voltage cable widely used at present is a cross-linked polyethylene (XLPE) cable, which is manufactured by a cross-linking process, more harmful cross-linked byproducts are generated in the manufacturing process, meanwhile, the cross-linked material becomes thermosetting, the cable is difficult to recycle after the service life is exhausted, the cable can only be treated by methods such as burying incineration and the like, the environmental hazard is greater, the development requirement of the thermoplastic non-cross-linked cable for compounding green is developed, the polypropylene (PP) material has excellent electrical performance and heat resistance, the thermoplastic cable taking the polypropylene (PP) as matrix resin has the potential of replacing the XLPE cable at present, the thermoplastic polypropylene cable insulation material is researched more at present, the polypropylene insulation material is developed by domestic existing companies, the semiconductive shielding material matched with the polypropylene (PP) material is researched less at present, the shielding material is generally used for achieving the semiconductive effect, more than 30 wt% of conductive carbon black needs to be filled, but the polypropylene material is nonpolar, has higher processing viscosity and high crystallinity, and has poor compatibility with conductive filler carbon black, and the high carbon black filling can reduce the processing performance, the mechanical property and the surface smoothness more, so how to consider the conductivity, the mechanical property and the processing performance of the shielding material for the non-crosslinked cable becomes the main problem in the shielding material for the non-crosslinked cable at present. When the temperature of the semiconductive shielding material rises, molecular chain movement is accelerated, the thermal expansion rate of resin is higher than that of carbon black, and a conductive path is broken, so that the volume resistivity rises along with the rise of the temperature, and the Positive Temperature Coefficient (PTC) of the volume resistivity is reflected.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a shielding material for a polypropylene-based thermoplastic cable and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: a shielding material for polypropylene-based thermoplastic cables comprises the following components in parts by weight: 100 parts of ethylene-propylene block copolymer polypropylene, 3-20 parts of conductive carbon black, 0.5-1.5 parts of high-conductivity graphene, 0.5-1.5 parts of coupling agent and 1.4-4.5 parts of auxiliary agent, wherein the auxiliary agent comprises antioxidant, lubricant and anti-caking agent; the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 5-30%.
The shielding material for the polypropylene-based thermoplastic cable is matched with ethylene-propylene block copolymer polypropylene, conductive carbon black, high-conductivity graphene, a coupling agent and an auxiliary agent, and the content of the components is limited, so that the conductivity and the mechanical property of the shielding material for the polypropylene-based thermoplastic cable are remarkably improved, and the mechanical property reduction of the shielding material for the polypropylene-based thermoplastic cable caused by the high-content conductive carbon black is avoided. The ethylene-propylene block copolymer polypropylene has small and uniform crystal size, higher crystallinity and high crystal density, a plurality of small amorphous regions are formed by the structure, and the conductive carbon black is matched with the ethylene-propylene block copolymer polypropylene, so that the conductive performance of the shielding material for the polypropylene-based thermoplastic cable under the content of the conductive carbon black is improved; in the shielding material for the polypropylene-based thermoplastic cable, the high-conductivity graphite and the conductive carbon black generate synergistic action, the granular carbon black is contacted with each other by a granular chain or an aggregate to form a conductive path, when the carbon black is added to a certain concentration, a three-dimensional conductive network can be formed in the material, the graphene sheet layers with two-dimensional structures play a bridging role in a conductive path, carbon black particles which are originally far away are connected, the addition amount of the carbon black for forming the conductive network is reduced, the conductive performance of the shielding material for the polypropylene-based thermoplastic cable under the condition of the same amount of conductive materials is improved, the volume resistivity can still be kept low under the condition of low carbon black content, and the ethylene-propylene block copolymer polypropylene has good compatibility with conductive carbon black and high conductive graphene, has higher low-temperature toughness compared with isotactic polypropylene, and is beneficial to improving the mechanical property of the shielding material for polypropylene-based thermoplastic cables. The thermal stability of the conductive path can be guaranteed only by the high carbon black filling amount; the shielding material for the polypropylene-based thermoplastic cable, which is matched with ethylene-propylene block copolymer polypropylene, conductive carbon black and high-conductivity graphene, still has excellent conductivity and mechanical properties under high-temperature conditions.
Preferably, the mass fraction of the ethylene segments in the ethylene-propylene block copolymer polypropylene is 8-25%.
The inventor finds that in the shielding material for the polypropylene-based thermoplastic cable, the mass fraction of the ethylene segment in the ethylene-propylene block copolymer polypropylene is 8-25%, so that the conductivity and the mechanical property of the shielding material for the polypropylene-based thermoplastic cable can be remarkably improved.
Preferably, the mass fraction of the ethylene segment in the ethylene-propylene block copolymer polypropylene is 15-20%.
The inventor finds that in the shielding material for the polypropylene-based thermoplastic cable, the mass fraction of the ethylene segment in the ethylene-propylene block copolymer polypropylene is 15-20%, so that the conductivity and mechanical property of the shielding material for the polypropylene-based thermoplastic cable can be remarkably improved.
Preferably, the weight ratio of the ethylene-propylene block copolymer polypropylene, the conductive carbon black and the highly conductive graphene in the shielding material for the polypropylene-based thermoplastic cable is that the ethylene-propylene block copolymer polypropylene: conductive carbon black: high-conductivity graphene 100: (5-15): (0.5 to 1.5).
The inventors found through research that, in the above-mentioned shielding material for polypropylene-based thermoplastic cables, the weight ratio of the ethylene-propylene block copolymer polypropylene, the conductive carbon black and the highly conductive graphene in the shielding material for polypropylene-based thermoplastic cables is 100: (5-15): (0.5-1.5), the shielding material for the polypropylene-based thermoplastic cable has better conductivity and mechanical properties.
Preferably, the average particle size of the conductive carbon black is 20-80 nm, and the BET specific surface area of the conductive carbon black is 150-500 m2/g。
In the shielding material for the polypropylene-based thermoplastic cable, the specific surface area of the conductive carbon black is large, the structure is strong, under the same quality, a conductive network can be formed in the shielding material for the polypropylene-based thermoplastic cable by using a lower filling amount, the expected conductive effect is achieved, but the surface binding energy is increased due to the excessively high specific surface area of the conductive carbon black, the agglomeration condition is aggravated, the carbon black is difficult to be uniformly dispersed in a matrix in a mechanical mixing mode, and the mechanical property is reduced, and the inventor finds that the BET specific surface area of the conductive carbon black is 150-500 m2In g, polypropylene based thermoplasticThe shielding material for the cable has better conductivity and mechanical property.
Preferably, the number of layers of the high-conductivity graphene is 1-6, the average thickness of the layers of the high-conductivity graphene is 1-5 nm, and the BET specific surface area of the high-conductivity graphene is 20-100 m2/g。
Preferably, the coupling agent is a silane coupling agent or a titanate coupling agent.
Preferably, the silane coupling agent is KH550 (gamma-aminopropyltriethoxysilane) or vinyltris (beta-methoxyethoxy) silane.
Preferably, the antioxidant is one or more of antioxidant 300, antioxidant 1010 and antioxidant 1076; the lubricant is one of silicone oil, liquid paraffin and polypropylene wax; the anti-caking agent is ethylene bis stearamide, erucamide or barium stearate.
The lubricant in the shielding material for the polypropylene-based thermoplastic cable enables the surface of the shielding material for the polypropylene-based thermoplastic cable to be smooth in the extrusion process, avoids the influence on the conductivity of the shielding material for the polypropylene-based thermoplastic cable, ensures that ethylene-propylene block copolymer polypropylene is not oxidized in the processing process by an antioxidant in the shielding material for the polypropylene-based thermoplastic cable, and improves the heat resistance and the ageing resistance of the shielding material for the polypropylene-based thermoplastic cable; the anti-adhesive agent in the shielding material for the polypropylene-based thermoplastic cable can ensure that the shielding material for the polypropylene-based thermoplastic cable can be stripped from an insulating layer under the condition of ensuring tight interface combination after co-extrusion, and the insulating layer is not damaged after stripping.
Preferably, the auxiliary agent comprises 0.1-0.5 part by weight of antioxidant, 1-3 parts by weight of lubricant and 0.3-1 part by weight of anti-caking agent.
The invention also provides a preparation method of the shielding material for any polypropylene-based thermoplastic cable, which comprises the following steps:
(1) uniformly mixing conductive carbon black, high-conductivity graphene and a coupling agent according to a weight ratio to obtain a conductive mixture;
(2) melting and blending ethylene-propylene block copolymer polypropylene, a conductive mixture, an antioxidant, a lubricant and an anti-caking agent at 180-210 ℃, water-cooling, granulating, drying and dehydrating to obtain a polypropylene-based thermoplastic material;
(3) and (3) carrying out heat treatment on the polypropylene-based thermoplastic material obtained in the step (2) at the temperature of 120-140 ℃ for 2-6 h to obtain the shielding material for the polypropylene-based thermoplastic cable.
The preparation method comprises the steps of carrying out heat treatment on the polypropylene-based thermoplastic material obtained in the step (2) at 120-140 ℃ for 2-6 h, naturally cooling to room temperature, carrying out normalization treatment, removing heat history, rearranging molecular chain segments of the material, and avoiding the influence of the preparation method on the material performance.
The invention has the beneficial effects that: the invention provides a shielding material for a polypropylene-based thermoplastic cable and a preparation method thereof, which overcome the problem of mechanical property reduction caused by the fact that high-content conductive carbon black needs to be added in order to improve the conductivity of the shielding material for the polypropylene-based thermoplastic cable.
Drawings
FIG. 1 is a graph showing the volume resistivity at different temperatures of a shield material for polypropylene-based thermoplastic cables according to an embodiment of the present invention.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The shielding material for the polypropylene-based thermoplastic cable, which is an embodiment of the invention, comprises the following components in parts by weight: 100 parts of ethylene-propylene block copolymer polypropylene, 5The conductive carbon black comprises, by weight, conductive carbon black, 1 part of high-conductivity graphene, 1 part of a coupling agent A172 (vinyl tris (beta-methoxyethoxy) silane), 0.5 part of an antioxidant 300, 1 part of lubricant silicone oil and 1 part of an anti-bonding agent Ethylene Bis Stearamide (EBS), wherein the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 20%, the average particle size of the conductive carbon black is 20-80 nm, and the BET specific surface area of the conductive carbon black is 150-500 m2The number of layers of the high-conductivity graphene is 1-6, the average thickness of the layers of the high-conductivity graphene is 1-5 nm, and the BET specific surface area of the high-conductivity graphene is 20-100 m2/g。
The method for preparing the shielding material for polypropylene-based thermoplastic cable of the present embodiment comprises the steps of:
(1) uniformly mixing conductive carbon black, high-conductivity graphene and a coupling agent according to a weight ratio to obtain a conductive mixture;
(2) adding ethylene-propylene block copolymer polypropylene, a conductive mixture, an antioxidant, a lubricant and an anti-caking agent into a BUSS extruder, melting and blending at 190 ℃, water-cooling, granulating, drying and dehydrating to obtain a polypropylene-based thermoplastic material;
(3) and (3) carrying out heat treatment on the polypropylene-based thermoplastic material obtained in the step (2) at the temperature of 120-140 ℃ for 2-6 h to obtain the shielding material for the polypropylene-based thermoplastic cable.
Example 2
The shielding material for the polypropylene-based thermoplastic cable, which is an embodiment of the invention, comprises the following components in parts by weight: the conductive carbon black comprises, by mass, 100 parts of ethylene-propylene block copolymer polypropylene, 7.5 parts of conductive carbon black, 0.5 part of highly conductive graphene, 1 part of a coupling agent KH550 (gamma-aminopropyltriethoxysilane), 0.5 part of an antioxidant 1010, 1 part of lubricant liquid paraffin and 1 part of an anti-caking agent barium stearate, wherein the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 20%, the average particle size of the conductive carbon black is 20-80 nm, and the BET specific surface area of the conductive carbon black is 150-500 m2The number of layers of the high-conductivity graphene is 1-6, the average thickness of the layers of the high-conductivity graphene is 1-5 nm, and the thickness of the layers is larger than the thickness of the layerBET specific surface area of high-conductivity graphene is 20-100 m2/g。
Example 3
The shielding material for the polypropylene-based thermoplastic cable, which is an embodiment of the invention, comprises the following components in parts by weight: the conductive carbon black comprises, by mass, 100 parts of ethylene-propylene block copolymer polypropylene, 10 parts of conductive carbon black, 0.5 part of high-conductivity graphene, 1 part of a coupling agent KH550 (gamma-aminopropyltriethoxysilane), 0.5 part of an antioxidant 1010, 1 part of lubricant liquid paraffin and 1 part of an anti-caking agent barium stearate, wherein the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 20%, the average particle size of the conductive carbon black is 20-80 nm, and the BET specific surface area of the conductive carbon black is 150-500 m2The number of layers of the high-conductivity graphene is 1-6, the average thickness of the layers of the high-conductivity graphene is 1-5 nm, and the BET specific surface area of the high-conductivity graphene is 20-100 m2/g。
Comparative example 1
A shielding material for a polypropylene-based thermoplastic cable as a comparative example of the present invention, which comprises the following components in parts by weight: the conductive carbon black comprises 100 parts of ethylene-propylene block copolymer polypropylene, 8 parts of conductive carbon black, 1 part of coupling agent KH550 (gamma-aminopropyltriethoxysilane), 0.5 part of antioxidant 1010, 1 part of lubricant liquid paraffin and 1 part of anti-caking agent barium stearate, wherein the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 20%, the average particle size of the conductive carbon black is 20-80 nm, and the BET specific surface area of the conductive carbon black is 150-500 m2/g。
Comparative example 2
A shielding material for a polypropylene-based thermoplastic cable as a comparative example of the present invention, which comprises the following components in parts by weight: 85 parts of ethylene-propylene block copolymer polypropylene, 15 parts of conductive carbon black, 1 part of coupling agent KH550 (gamma-aminopropyltriethoxysilane), 0.5 part of antioxidant 1010, 1 part of lubricant liquid paraffin and 1 part of anti-caking agent barium stearate, wherein ethylene fragments in the ethylene-propylene block copolymer polypropylene are ethylene fragmentsThe weight percentage is 20%, the average particle diameter of the conductive carbon black is 20-80 nm, and the BET specific surface area of the conductive carbon black is 150-500 m2/g。
Comparative example 3
A shielding material for a polypropylene-based thermoplastic cable as a comparative example of the present invention, which comprises the following components in parts by weight: 100 parts of ethylene-propylene block copolymer polypropylene, 7.5 parts of Ketjen black EC600JD, 0.5 part of high-conductivity graphene, 1 part of coupling agent KH550 (gamma-aminopropyltriethoxysilane), 0.5 part of antioxidant 1010, 1 part of lubricant liquid paraffin and 1 part of anti-caking agent barium stearate, wherein the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 20%; the Ketjen black EC600JD has an average particle size of 21nm, and the Ketjen black EC600JD has an average particle size of 1400m2The number of layers of the high-conductivity graphene is 1-6, the average thickness of the layers of the high-conductivity graphene is 1-5 nm, and the BET specific surface area of the high-conductivity graphene is 20-100 m2/g。
Comparative example 4
A shielding material for a polypropylene-based thermoplastic cable as a comparative example of the present invention, which comprises the following components in parts by weight: 100 parts of isotactic polypropylene T30S, 7.5 parts of conductive carbon black, 0.5 part of high-conductivity graphene, 1 part of coupling agent KH550 (gamma-aminopropyltriethoxysilane), 0.5 part of antioxidant 1010, 1 part of lubricant liquid paraffin and 1 part of anti-caking agent barium stearate, wherein the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 20%, the average particle size of the conductive carbon black is 20-80 nm, and the BET specific surface area of the conductive carbon black is 150-500 m2The number of layers of the high-conductivity graphene is 1-6, the average thickness of the layers of the high-conductivity graphene is 1-5 nm, and the BET specific surface area of the high-conductivity graphene is 20-100 m2/g。
Effect example 1
Preheating the shielding material for the polypropylene-based thermoplastic cable obtained in the step (3) at 190 ℃ for 10min under a vulcanizing tablet press, tabletting at 15MPa for 8min, keeping the pressure at 135 ℃ for 30min, and naturally cooling to obtain a sheet-shaped test sample. The shielding material samples for polypropylene-based thermoplastic cables of examples 1 to 3 and comparative examples 1 to 4 were examined to measure elongation at break, tensile strength, and volume resistivity at various temperatures. The results are shown in table 1 and fig. 1.
TABLE 1 conductivity and mechanical Properties of Shielding Material for Polypropylene-based thermoplastic Cable
As can be seen from the results in table 1 and fig. 1, the comparative examples, comparative examples 1 to 2, and comparative example 4 illustrate that the shielding material for polypropylene-based thermoplastic cables of the examples is compounded with ethylene-propylene block copolymer polypropylene, conductive carbon black, highly conductive graphene, a coupling agent, and an auxiliary agent, and the content of the components is limited, so that the conductive performance and mechanical properties of the shielding material for polypropylene-based thermoplastic cables are remarkably improved, and the mechanical property degradation of the shielding material for polypropylene-based thermoplastic cables caused by the high content of conductive carbon black is avoided. In addition, the shielding material for the polypropylene-based thermoplastic cable of the embodiment is matched with ethylene-propylene block copolymer polypropylene, conductive carbon black and high-conductivity graphene, and still has excellent conductivity and mechanical properties under a high-temperature condition. In comparative example 4, the polypropylene is used to mix with the conductive carbon black and the highly conductive graphene, although the requirement of the conductive performance can be met, the mechanical performance is sharply reduced. In comparative example 3, after the carbon black is replaced with the carbon black with a high specific surface area, the volume resistivity is further reduced, which shows that the conductive carbon black with a high specific surface area can improve the conductive performance, but the elongation at break is reduced obviously, which shows that the carbon black with a high specific surface area is agglomerated, and a larger aggregate becomes a stress concentration point, so that the tensile property is reduced.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The shielding material for the polypropylene-based thermoplastic cable is characterized by comprising the following components in parts by weight: 100 parts of ethylene-propylene block copolymer polypropylene, 3-20 parts of conductive carbon black, 0.5-1.5 parts of high-conductivity graphene, 0.5-1.5 parts of coupling agent and 1.4-4.5 parts of auxiliary agent, wherein the auxiliary agent comprises antioxidant, lubricant and anti-caking agent; the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 5-30%.
2. The shielding material for polypropylene-based thermoplastic cables as claimed in claim 1, wherein the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 8 to 25%.
3. The shielding material for polypropylene-based thermoplastic cables as claimed in claim 2, wherein the mass fraction of ethylene segments in the ethylene-propylene block copolymer polypropylene is 15 to 20%.
4. The shielding material for polypropylene-based thermoplastic cables as claimed in claim 2 or 3, wherein the weight ratio of the ethylene propylene block copolymer polypropylene, the conductive carbon black and the highly conductive graphene in the shielding material for polypropylene-based thermoplastic cables is the weight ratio of the ethylene propylene block copolymer polypropylene: conductive carbon black: high-conductivity graphene 100: (5-15): (0.5 to 1.5).
5. The shielding material for polypropylene-based thermoplastic cables as claimed in claim 1, wherein the conductive carbon black has an average particle diameter of 20 to 80nm and a BET specific surface area of 150 to 500m2/g。
6. The shielding material for polypropylene-based thermoplastic cables as claimed in claim 1, wherein the number of layers of the highly conductive graphene is 1 to 6, and the high conductivity graphene is highThe average thickness of the layer of the conductive graphene is 1-5 nm, and the BET specific surface area of the high-conductivity graphene is 20-100 m2/g。
7. The shielding material for polypropylene-based thermoplastic cables as claimed in claim 1, wherein the coupling agent is a silane coupling agent or a titanate coupling agent.
8. The shielding material for polypropylene-based thermoplastic cables as claimed in claim 1, wherein the antioxidant is one or more of antioxidant 300, antioxidant 1010 and antioxidant 1076; the lubricant is one of silicone oil, liquid paraffin and polypropylene wax; the anti-caking agent is ethylene bis stearamide, erucamide or barium stearate.
9. The shielding material for polypropylene-based thermoplastic cables as claimed in claim 1, wherein the auxiliary comprises 0.1 to 0.5 parts by weight of an antioxidant, 1 to 3 parts by weight of a lubricant and 0.3 to 1 part by weight of an anti-adhesive.
10. A method for preparing a shielding material for polypropylene-based thermoplastic cables, characterized in that the method comprises the following steps:
(1) uniformly mixing conductive carbon black, high-conductivity graphene and a coupling agent according to a weight ratio to obtain a conductive mixture;
(2) melting and blending ethylene-propylene block copolymer polypropylene, a conductive mixture, an antioxidant, a lubricant and an anti-caking agent at 180-210 ℃, water-cooling, granulating, drying and dehydrating to obtain a polypropylene-based thermoplastic material;
(3) and (3) carrying out heat treatment on the polypropylene-based thermoplastic material obtained in the step (2) at the temperature of 120-140 ℃ for 2-6 h to obtain the shielding material for the polypropylene-based thermoplastic cable.
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