CN116023727A - Water tree resistant overhead material and preparation method and application thereof - Google Patents
Water tree resistant overhead material and preparation method and application thereof Download PDFInfo
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- 235000006650 Syzygium cordatum Nutrition 0.000 title claims abstract description 69
- 239000000463 material Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- QYMGIIIPAFAFRX-UHFFFAOYSA-N butyl prop-2-enoate;ethene Chemical compound C=C.CCCCOC(=O)C=C QYMGIIIPAFAFRX-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229920006245 ethylene-butyl acrylate Polymers 0.000 claims abstract description 40
- 229920001912 maleic anhydride grafted polyethylene Polymers 0.000 claims abstract description 31
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 29
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 26
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 26
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 23
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 23
- 239000012745 toughening agent Substances 0.000 claims abstract description 22
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 16
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- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical group CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 claims description 3
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The invention provides a water tree resistant overhead material and a preparation method and application thereof. The water tree resistant overhead material comprises the following components: low density polyethylene, maleic anhydride grafted polyethylene, a toughening agent, an ethylene-butyl acrylate copolymer, polyethylene glycol, conductive carbon black master batch, an antioxidant and a crosslinking agent; wherein the mass ratio of the maleic anhydride grafted polyethylene to the toughening agent to the ethylene-butyl acrylate copolymer is 0.5-5:1-3, preferably 1:1-3:1-1.5. The water tree resistant overhead material takes the low-density polyethylene as a matrix, and the maleic anhydride grafted polyethylene, the toughening agent and the ethylene-butyl acrylate copolymer and the polyethylene glycol are added, so that the material has the water tree resistant performance.
Description
Technical Field
The invention belongs to the technical field of cable material production, relates to an overhead material, and particularly relates to a water tree resistant overhead material, and a preparation method and application thereof.
Background
Since the fifty years, the crosslinked polyethylene has been widely used in power transmission and distribution systems because of its excellent properties, simple manufacturing process, easy maintenance, and the like.
In the late 70 s of the last century, crosslinked polyethylene, like other polymers, was found to undergo degradation during cable operation, which is caused by "water treeing" of the cable insulation. As the study of the water tree phenomenon of the crosslinked polyethylene is further advanced, it is found that the water tree is an important cause of the aging breakdown of the crosslinked polyethylene cable to reduce the service life.
The water tree branches are caused by damage to the solid insulation exposed to water. Water trees form in areas of high stress, such as rough interfaces, protrusions at the tip of the conductor, micro-holes or impurities in the insulation. The generation of the water branches has the following characteristics: (a) the presence of water is a prerequisite for the production of water branches; (b) During the growth of the water tree branches, the local current cannot be normally detected. (c) The water branches grow for several years before reaching a certain size and eventually leading to breakdown of the cable; (d) a certain electric field is required to be applied.
There are two methods for designing a medium-high voltage power cable (medium-voltage power cable means a cable with a working voltage in the range of 1kV to 35kV, high-voltage power cable means a cable with a working voltage above 66 kV), one is a "dry design" method, and the other is a "wet design" method, and the dry design is to add a layer of metal sheath outside the insulating layer, so that the cable operates in a dry environment. Wet designs, which add a polymeric jacket to the exterior of the insulation layer, do not completely prevent moisture from diffusing from the outside environment into the insulation layer of the cable.
Researches show that after the medium-high voltage power cable runs for 8-12 years, a large amount of water trees generally grow on the insulating layer, so that breakdown accidents occur on a large amount of crosslinked cables, the service life of the cables is reduced, and the running safety of a power grid is affected. Successful research and development of the water tree resistant crosslinked cable has important significance for reducing the occurrence of the water tree phenomenon of the cable and prolonging the service life of the cable.
Disclosure of Invention
In order to solve the defects of poor water tree aging resistance and poor universality of the existing material, the invention firstly provides the water tree aging resistance overhead material, which has the advantages of reducing the water tree aging, prolonging the service life of the cable and meeting the conventional performance on the premise of not changing the existing processing technology of the common overhead cable when in use.
The invention further provides a preparation method of the water tree resistant overhead material, raw materials are easy to obtain, and the preparation steps are simple and feasible and are suitable for mass production.
The invention finally provides application of the water tree resistant overhead material.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the invention provides a water tree resistant overhead material, which comprises the following raw materials in parts by weight: 90 to 95 parts of low-density polyethylene, 0.5 to 5 parts of maleic anhydride grafted polyethylene, 1 to 5 parts of toughening agent, 1 to 3 parts of ethylene-butyl acrylate copolymer, 0.5 to 4 parts of polyethylene glycol, 1 to 5 parts of conductive carbon black master batch, 0.1 to 0.5 part of antioxidant and 1.5 to 3 parts of crosslinking agent.
As a preferable scheme of the invention, the water tree resistant overhead material comprises the following raw materials in parts by weight: 92-95 parts of low-density polyethylene, 0.5-3 parts of maleic anhydride grafted polyethylene, 1-3 parts of toughening agent, 1-2.5 parts of ethylene-butyl acrylate copolymer, 0.5-3 parts of polyethylene glycol, 1-4 parts of conductive carbon black master batch, 0.1-0.3 part of antioxidant and 1.5-2.3 parts of crosslinking agent.
In the present invention, the molecular weight of polyethylene glycol is required to be 5000-10000.
The mass ratio of the maleic anhydride grafted polyethylene to the toughening agent to the ethylene-butyl acrylate copolymer is 0.5-5:1-3.
Preferably, the mass ratio of the maleic anhydride grafted polyethylene to the toughening agent to the ethylene-butyl acrylate copolymer is 1:1-3:1-1.5.
As a preferred embodiment of the present invention, the melt index of the low density polyethylene is 2.0g/10 min.+ -. 0.1.
As a preferred embodiment of the present invention, the melt index of the maleic anhydride-grafted polyethylene is 1.70g/10 min.+ -. 0.1.
As a preferable mode of the invention, the melt index of the ethylene-butyl acrylate copolymer is 6-8g/10min, and the content of butyl acrylate is 15-20%.
As a preferable scheme of the invention, the content of carbon black in the conductive carbon black master batch is 35% -45%.
As a preferable scheme of the invention, the antioxidant is 4,4' -thiobis (6-tertiary butyl-3-methylphenol), and the melting point is 161-164 ℃.
As a preferred embodiment of the present invention, the crosslinking agent is dicumyl peroxide, and the melting point is required to be higher than 38.5 ℃ relative to the molecular weight 270.38.
In a second aspect, the invention provides a preparation method of the water tree resistant overhead material, which comprises the following steps:
1) Proportioning low-density polyethylene, maleic anhydride grafted polyethylene, a toughening agent, an ethylene-butyl acrylate copolymer, polyethylene glycol, conductive carbon black master batch and an antioxidant according to the formula proportion to obtain a premix;
2) Sealing and mixing the premix obtained in the step 1) to obtain cooked rubber; extruding, bracing and granulating the cooked glue, screening the obtained particles, and then air-drying and cooling to obtain master batch;
3) Taking low-density polyethylene as a base material, adding the master batch obtained in the step 2), and preparing a semi-finished product by mixing, filtering and granulating; the addition amount of the master batch is 10% of the base material;
4) And (3) adding a cross-linking agent into the semi-finished product obtained in the step (3) according to the formula proportion, preheating, absorbing, cooling and packaging to obtain the water tree resistant overhead material.
In a third aspect, the invention provides an application of the water tree resistant overhead material in preparing an overhead cable.
Compared with the prior art, the invention has the following beneficial effects:
1) The water tree resistant overhead material takes the low density polyethylene as a matrix, and the maleic anhydride grafted polyethylene, the toughening agent POE, the ethylene-butyl acrylate copolymer and the polyethylene glycol are added, so that the overhead material has the water tree resistant performance, the water tree aging is reduced, and the service life of the cable is prolonged.
2) When the water tree resistant overhead material is used, the conventional performance is met on the premise of not changing the existing processing technology of the common overhead cable.
3) The preparation method of the water tree resistant overhead material has the advantages of easily obtained raw materials, simple and feasible preparation steps and suitability for mass production.
4) In the water tree resistant overhead material, the maleic anhydride grafted polyethylene can hold the ethylene-butyl acrylate copolymer and the polyethylene glycol, so that the dispersion is uniform, and the uneven dispersion caused by poor compatibility after extrusion can be avoided.
5) According to the invention, the mechanical property of the material is good, and the tensile strength can reach more than 20MPa through the maleic anhydride grafted polyethylene, the toughening agent and the ethylene-butyl acrylate copolymer.
6) The conductive carbon black is added into the water tree resistant overhead material so as to obtain ultraviolet aging resistance.
Detailed Description
The following describes the present invention in detail. The following description of the technical features is based on the representative embodiments and specific examples of the present invention, but the present invention is not limited to these embodiments and specific examples. It should be noted that:
in the present specification, the numerical range indicated by the term "numerical value a to numerical value B" means a range including the end point numerical value A, B.
In the present specification, the meaning of "can" includes both the meaning of performing a certain process and the meaning of not performing a certain process.
In this specification, "optional" or "optionally" means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
Reference throughout this specification to "some specific/preferred embodiments," "other specific/preferred embodiments," "an embodiment," and so forth, means that a particular element (e.g., feature, structure, property, and/or characteristic) described in connection with the embodiment is included in at least one embodiment described herein, and may or may not be present in other embodiments. In addition, it is to be understood that the elements may be combined in any suitable manner in the various embodiments.
The invention firstly provides a water tree resistant overhead material, which comprises the following components: the composite material comprises low-density polyethylene, maleic anhydride grafted polyethylene, a toughening agent POE, an ethylene-butyl acrylate copolymer, polyethylene glycol, conductive carbon black master batch, an antioxidant 300# and a crosslinking agent DCP; wherein the mass ratio of the maleic anhydride grafted polyethylene to the toughening agent POE to the ethylene-butyl acrylate copolymer is 0.5-5:1-3, preferably 1:1-3:1-1.5.
The low-density polyethylene has the advantages of stable melt index, stable extrusion performance during cable extrusion, high strength, good toughness, high rigidity, heat resistance, cold resistance and the like, and is used as a base material, so that the water tree resistant overhead material for insulation with excellent performance is prepared.
Specifically, in the present invention, it is preferable to use an optimum melt index for polyethylene for cables, for example, having a melt index of 2.0g/10 min.+ -. 0.1: J182B, etc.
According to the invention, the low-density polyethylene is used as a matrix, and the maleic anhydride grafted polyethylene, the toughening agent POE and the ethylene-butyl acrylate copolymer are added, so that the maleic anhydride grafted polyethylene can hold the ethylene-butyl acrylate copolymer and the polyethylene glycol, and the ethylene-butyl acrylate copolymer and the polyethylene glycol are uniformly dispersed in the formula, and the uneven dispersion caused by poor compatibility after extrusion can be avoided.
Specifically, in the ethylene-butyl acrylate copolymer, the melt index of the ethylene-butyl acrylate copolymer is 6-8g/10min, the content of butyl acrylate is 15-20%, and the ethylene-butyl acrylate copolymer with the melt index has better fluidity and compatibility in a system.
The mass ratio of the maleic anhydride grafted polyethylene to the toughening agent POE to the ethylene-butyl acrylate copolymer is 0.5-5:1-3, and most preferably 1:1-3:1.5.
When the mass ratio of the maleic anhydride grafted polyethylene to the toughening agent POE to the ethylene-butyl acrylate copolymer is 1:1-3:1.5, the mechanical properties of the material are good, and the tensile strength can reach more than 20 MPa.
The ethylene-butyl acrylate copolymer and the polyethylene glycol have the characteristic of inhibiting the growth of the water tree, and can be added with a proper proportion for adjustment on the premise of not affecting other performances so as to meet the index of the water tree.
The ethylene-butyl acrylate copolymer and polyethylene glycol are added in an amount of 1 to 3 parts and 0.5 to 4 parts, preferably 1.5 parts and 1 to 2 parts by weight, for example: 1 part, 1.5 parts, 2 parts, etc. When the addition amount of the ethylene-butyl acrylate copolymer and the polyethylene glycol is 1.5 parts and 1-2 parts, other conventional performances are qualified, and the water tree performance is more excellent.
In some specific embodiments, the polyethylene glycol of the invention has a molecular weight of 5000-10000, and has a higher molecular weight and a stronger viscosity, and is basically selected from about 10000, thereby being convenient for production and processing and meeting the requirements of water tree performance.
Furthermore, the water tree resistant overhead material also comprises conductive carbon black master batch, the ultraviolet aging resistant performance can be obtained by adding the conductive carbon black, the carbon black master batch contains 35-45% of carbon black, the carrier is mainly low-density polyethylene, specifically, the addition amount of the conductive carbon black master batch is 1-4 parts, preferably 2-3 parts, for example: 2 parts, 2.5 parts, 3 parts, etc. When the addition amount of the conductive carbon black master batch is 2-3 parts, the ultraviolet aging resistance is better and superior.
Specifically, in the invention, the conductive carbon black master batch can be purchased or processed by oneself, and carbon black is commonly used in Yongdong YD-250C, yongdong 260, cabot carbon black VXC200, cabot carbon black VXC68 and the like.
Furthermore, the water tree resistant overhead material also comprises an antioxidant 300# which is fully named as 4,4' -thiobis (6-tertiary butyl-3-methylphenol), and pure white powder without impurities is selected, and the melting point is 161-164 ℃. Specifically, the antioxidant is added in an amount of 0.1 to 0.5 part, preferably 0.2 to 0.4 part, by weight, for example: 0.2 parts, 0.3 parts, 0.4 parts, etc.
Furthermore, the water tree resistant overhead material also comprises a cross-linking agent DCP, which is named as dicumyl peroxide, has a relative molecular weight 270.38, a melting point of more than 38.5 ℃, can improve the cross-linking performance by adding the water tree resistant overhead material, and needs to be controlled within 80 percent, specifically, the adding amount of the DCP is 1.5 to 3 parts by weight, preferably 1.8 to 2.1 parts by weight, for example: 1.8 parts, 1.85 parts, 1.90 parts, 1.95 parts, 2.0 parts, 2.1 parts, etc.
The invention also provides a preparation method of the water tree resistant overhead material, which comprises the step of mixing the components of the water tree resistant overhead material.
Specifically, the method comprises the steps of:
adding maleic anhydride grafted polyethylene, a toughening agent POE, an ethylene-butyl acrylate copolymer, polyethylene glycol, conductive carbon black master batch and an antioxidant 300# into a low-density polyethylene serving as a carrier, and granulating the mixture by a mixing internal mixer to prepare master batch;
adding master batches into a low-density polyethylene serving as a carrier according to the formula proportion, and preparing a semi-finished product by high-temperature mixing, filtering and granulating;
and adding the cross-linking agent DCP into the semi-finished product according to the formula proportion, heating and stirring uniformly, fully absorbing in an absorption bin, and cooling to obtain the water tree resistant overhead material.
Further, the method may comprise the steps of:
(1) The low-density polyethylene, maleic anhydride grafted polyethylene, a toughening agent POE, an ethylene-butyl acrylate copolymer, polyethylene glycol, conductive carbon black master batch and antioxidant 300# are proportioned according to the addition amount of 10 times of the original formula proportion.
(2) Adding the pretreated premix in the step (1) into an internal mixer, sealing and mixing for 1200-1500 seconds, and mixing the mature rubber (namely jelly), wherein cooling water is started in the process to ensure that the temperature of the material is lower than 135 ℃.
(3) And (3) feeding the mixed cooked rubber (namely jelly) into a single screw for extrusion, bracing and granulating, sieving the obtained particles by a vibrating screen to obtain irregular particles, and then air-drying, cooling and packaging to obtain the master batch.
(4) Adding 10% of master batch into low-density polyethylene serving as a base material, adding the base material into a single-screw reciprocating machine, and carrying out high-temperature mixing, filtering, granulating, drying and the like to obtain a semi-finished product.
(5) And (3) absorbing the cross-linking agent DCP by the semi-finished product according to the formula proportion, preheating, absorbing, cooling and packaging to finally obtain the water tree resistant overhead material finished product.
Examples
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the examples: ethylene-butyl acrylate copolymer: the melt index of the ethylene-butyl acrylate copolymer was 7g/10min, and the butyl acrylate content was 17% by mass, all from the company Acerama, france.
Polyethylene: the melt index of the ethylene-octene copolymer is 2.0g/10min.
Maleic anhydride grafted polyethylene: akema, france.
Toughening agent POE: DOW company.
Ethylene-butyl acrylate copolymer: yangzi Basv Inc.
300# antioxidant: shandong Wanke chemical Co., ltd.
Crosslinking agent: jiangsu dao chemical Co., ltd.
In the examples: the content of each component is calculated in parts by weight.
Example 1
(1) 93.5 parts of low-density polyethylene, 0.5 part of maleic anhydride grafted polyethylene, 2 parts of toughener POE, 1 part of ethylene-butyl acrylate copolymer, 0.5 part of polyethylene glycol, 2 parts of conductive carbon black master batch and 0.3 part of antioxidant 300# are proportioned according to the addition amount which is 10 times of the proportion of the original formulation.
(2) Adding the pretreated premix in the step (1) into an internal mixer, sealing and mixing for 1200-1500 seconds, and mixing the mature rubber (namely jelly), wherein cooling water is started in the process to ensure that the temperature of the material is lower than 135 ℃.
(3) And (3) feeding the mixed cooked rubber (namely jelly) into a single screw for extrusion, bracing and granulating, sieving the obtained particles by a vibrating screen to obtain irregular particles, and then air-drying, cooling and packaging to obtain the master batch.
(4) Adding 10% of master batch into low-density polyethylene serving as a base material, adding the base material into a single-screw reciprocating machine, and carrying out high-temperature mixing, filtering, granulating, drying and the like to obtain a semi-finished product.
(5) And (3) absorbing 2 parts of the cross-linking agent DCP by the semi-finished product according to the formula proportion, preheating, absorbing, cooling and packaging to finally obtain the water tree resistant overhead material finished product.
Example 2
This example differs from example 1 in that the maleic anhydride-grafted polyethylene 1 part, the ethylene-butyl acrylate copolymer 1.5 parts, the polyethylene glycol 1 part, and the remaining composition were the same as in example 1. And the preparation process of the embodiment 2 is the same as that of the embodiment 1, so that the water tree resistant overhead material is prepared.
Example 3
This example differs from example 1 in that the maleic anhydride-grafted polyethylene 1.5 parts, the ethylene-butyl acrylate copolymer 2 parts, the polyethylene glycol 1.5 parts, and the remainder of the composition were the same as in example 1. And the preparation process of the embodiment 3 is the same as that of the embodiment 1, so that the water tree resistant overhead material is prepared.
Example 4
This example differs from example 1 in that 2 parts of maleic anhydride-grafted polyethylene, 3 parts of ethylene-butyl acrylate copolymer, 2 parts of polyethylene glycol and the remainder of the composition is the same as in example 1. And the preparation process of the embodiment 4 is the same as that of the embodiment 1, so that the water tree resistant overhead material is prepared.
Example 5
This example differs from example 1 in that 3 parts of maleic anhydride-grafted polyethylene, 5 parts of ethylene-butyl acrylate copolymer, 3 parts of polyethylene glycol and the remainder of the composition is the same as in example 1. And the preparation process of the embodiment 5 is the same as that of the embodiment 1, so that the water tree resistant overhead material is prepared.
Performance testing
The water tree resistant overhead materials of examples 1-5 were subjected to the relevant performance tests according to the test criteria and requirements of table 1 below, and the results are shown in table 2:
TABLE 1 test Standard
TABLE 2 test results
After the water tree resistant overhead material of the embodiments 1-5 is prepared, the performance meets the index requirement, and as can be seen from the embodiments 1 and 5, when the addition amount of the maleic anhydride grafted polyethylene, the ethylene-butyl acrylate copolymer and the polyethylene glycol is increased, the electrical performance is obviously reduced, the water tree performance is improved to a certain extent, the water tree performance is required to meet the requirements of the two, the embodiment 2 is the optimal proportion, and the water tree resistant overhead material has good electrical performance and mechanical performance and can also meet the water tree performance.
It should be noted that, although the technical solution of the present invention is described in specific examples, those skilled in the art can understand that the present invention should not be limited thereto.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. The water-tree-resistant overhead material is characterized by comprising the following raw materials in parts by weight: 90 to 95 parts of low-density polyethylene, 0.5 to 5 parts of maleic anhydride grafted polyethylene, 1 to 5 parts of toughening agent, 1 to 3 parts of ethylene-butyl acrylate copolymer, 0.5 to 4 parts of polyethylene glycol, 1 to 5 parts of conductive carbon black master batch, 0.1 to 0.5 part of antioxidant and 1.5 to 3 parts of crosslinking agent.
2. The water tree resistant overhead material according to claim 1, wherein the water tree resistant overhead material comprises the following raw materials in parts by weight: 92-95 parts of low-density polyethylene, 0.5-3 parts of maleic anhydride grafted polyethylene, 1-3 parts of toughening agent, 1-2.5 parts of ethylene-butyl acrylate copolymer, 0.5-3 parts of polyethylene glycol, 1-4 parts of conductive carbon black master batch, 0.1-0.3 part of antioxidant and 1.5-2.3 parts of crosslinking agent.
3. The water tree resistant overhead material according to claim 1 or 2, wherein the low density polyethylene has a melt index of 2.0g/10min ± 0.1.
4. The water tree resistant overhead material according to claim 1 or 2, wherein the melt index of the maleic anhydride grafted polyethylene is 1.70g/10min ± 0.1.
5. The water tree resistant overhead material according to claim 1 or 2, wherein the ethylene-butyl acrylate copolymer has a melt index of 6-8g/10min and a butyl acrylate content of 15-20%.
6. The water tree resistant overhead material according to claim 1 or 2, wherein the content of carbon black in the conductive carbon black master batch is 35% -45%.
7. The water tree resistant overhead material according to claim 1 or 2, wherein the antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol) and has a melting point of 161-164 ℃.
8. The water tree resistant overhead material according to claim 1 or 2, wherein the cross-linking agent is dicumyl peroxide, the relative molecular weight is 270.38, and the melting point is required to be higher than 38.5 ℃.
9. A method for preparing the water tree resistant overhead material according to any one of claims 1 to 8, comprising the steps of:
1) Proportioning low-density polyethylene, maleic anhydride grafted polyethylene, a toughening agent, an ethylene-butyl acrylate copolymer, polyethylene glycol, conductive carbon black master batch and an antioxidant according to the formula proportion to obtain a premix;
2) Sealing and mixing the premix obtained in the step 1) to obtain cooked rubber; extruding, bracing and granulating the cooked glue, screening the obtained particles, and then air-drying and cooling to obtain master batch;
3) Taking low-density polyethylene as a base material, adding the master batch obtained in the step 2), and preparing a semi-finished product by mixing, filtering and granulating; the addition amount of the master batch is 10% of the base material;
4) And (3) adding a cross-linking agent into the semi-finished product obtained in the step (3) according to the formula proportion, preheating, absorbing, cooling and packaging to obtain the water tree resistant overhead material.
10. Use of the water tree resistant overhead material according to any one of claims 1 to 8 for the preparation of overhead cables.
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