CN117487267A - Preparation method of XLPE-PS alloyed composite material for direct current cable - Google Patents
Preparation method of XLPE-PS alloyed composite material for direct current cable Download PDFInfo
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- CN117487267A CN117487267A CN202311680443.5A CN202311680443A CN117487267A CN 117487267 A CN117487267 A CN 117487267A CN 202311680443 A CN202311680443 A CN 202311680443A CN 117487267 A CN117487267 A CN 117487267A
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- 239000002131 composite material Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims description 20
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 60
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 60
- 239000004793 Polystyrene Substances 0.000 claims abstract description 56
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 52
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 36
- 238000009413 insulation Methods 0.000 claims abstract description 33
- 229920005990 polystyrene resin Polymers 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 26
- 239000011347 resin Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 4
- 239000008187 granular material Substances 0.000 claims description 31
- 238000002156 mixing Methods 0.000 claims description 27
- 238000004132 cross linking Methods 0.000 claims description 21
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 13
- 230000008018 melting Effects 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 11
- 239000008188 pellet Substances 0.000 claims description 9
- 238000007872 degassing Methods 0.000 claims description 8
- 239000006227 byproduct Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims description 6
- 238000007605 air drying Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 4
- HCILJBJJZALOAL-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)-n'-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyl]propanehydrazide Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 HCILJBJJZALOAL-UHFFFAOYSA-N 0.000 claims description 3
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 14
- 239000004703 cross-linked polyethylene Substances 0.000 description 14
- 238000007792 addition Methods 0.000 description 9
- 229920002223 polystyrene Polymers 0.000 description 9
- 230000008901 benefit Effects 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000011810 insulating material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000012774 insulation material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- -1 after melt blending Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000012772 electrical insulation material Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Insulating Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-voltage direct current cable insulation composite material and a method, wherein the high-voltage direct current cable insulation composite material consists of a main material and auxiliary materials, the main material is low-density polyethylene resin, the auxiliary materials comprise micron-sized polystyrene resin, a cross-linking agent and an antioxidant, and the micron-sized polystyrene resin and the low-density polyethylene resin are cross-linked with each other to form a composite material XLPE-PS.
Description
Technical Field
The invention relates to the technical field of electrical insulation materials, in particular to a high-voltage direct-current cable insulation composite material and a method.
Background
High Voltage Direct Current (HVDC) transmission technology is of great interest due to its higher requirements for power consumption, transmission and capacity. The increase in power demand presents new challenges for insulation materials, particularly in recent decades, crosslinked polyethylene (XLPE) based on Low Density Polyethylene (LDPE) has played an important role worldwide. Researchers have proposed different techniques to improve dielectric strength and structural characteristics of insulating materials, including nanocomposite technology, voltage stabilizer technology, ultra-clean technology, and chemical modification technology. The most effective technique is the nano dielectric composite technique proposed by T.J.1ewis in 1994. There are researchers theories to improve XLPE electrical insulation properties by adding inorganic composites. Researchers have found that inorganic composite technology is not suitable for cable insulation because of thermal matching, filler aggregation, and poor electrical stability at the interface. These doubts are readily resolved when researchers focus on organic composites.
In the prior art, researchers are enthusiastic to develop an organic nano-dielectric material with good compatibility, higher reliability and better insulation. Polystyrene is a thermoplastic with wide prospects, and has excellent dielectric properties, good heat resistance, good dimensional stability, bacterial growth resistance and good chemical corrosion resistance. However, polystyrene has a high modulus and rigidity, and therefore, can be used only as a filler, and cannot be directly used as a cable insulation material.
The information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the defects or defects existing in the prior art, the invention provides the high-voltage direct-current cable insulation composite material and the method, and the crosslinking is carried out on PE at high temperature through micron-sized PS addition, so that the common doping is not adopted, the mode of crosslinking after melt blending is utilized, the PS and the LDPE participate in the crosslinking reaction together, the insulation stability of XLPE at high temperature is improved, and the breakdown strength is improved. The electrical stability of XLPE at high temperature is improved, PS which cannot be used as an insulating material due to overhigh rigidity is doped in a micron level, the PS is mixed in a molten form at high temperature, and the PS is put into the production of cable insulation in a crosslinked part form, so that the XLPE modification method is feasible in engineering and has low cost.
The aim of the invention is achieved by the following technical scheme.
The insulating composite material for the high-voltage direct-current cable consists of a main material and auxiliary materials, wherein the main material is low-density polyethylene resin, and the auxiliary materials comprise micron-sized polystyrene resin, a cross-linking agent and an antioxidant, wherein the micron-sized polystyrene resin and the low-density polyethylene resin are cross-linked with each other to form the composite material XLPE-PS.
In the high-voltage direct-current cable insulation composite material, the high-voltage direct-current cable insulation composite material comprises the following components in parts by mass:
1) 100 parts of low-density polyethylene resin;
2) 0.1-0.5 part of antioxidant;
3) 2 parts of dicumyl peroxide;
4) 0.1-5 parts of micron-sized polystyrene resin.
In the high-voltage direct-current cable insulation composite material, the micron-sized polystyrene resin is a powder material with the particle size of 5-500 mu m.
In the high-voltage direct-current cable insulation composite material, the antioxidant is one or more selected from antioxidant 168, antioxidant 264, antioxidant 300, antioxidant 1010, antioxidant 1024, antioxidant 1035, antioxidant BHT and DNP.
The preparation method of the high-voltage direct-current cable insulation composite material comprises the following steps,
step 1, proportioning according to a formula of 100 parts of low-density polyethylene resin, 0.1-0.5 part of antioxidant, 2 parts of dicumyl peroxide and 0.1-5 parts of micron-sized polystyrene resin;
step 2, mixing the low-density polyethylene resin, the antioxidant and the micron-sized polystyrene resin according to the proportion to form a mixture;
step 3, melting the mixture at high temperature by using a double-screw extruder, and preparing into granules;
step 4, baking or air-drying to remove the mixed moisture of the granules during the preparation of the materials;
step 5, blending the granules and dicumyl peroxide according to a proportion;
step 6, crosslinking is completed at high temperature and high pressure to obtain a high-voltage direct current cable insulation composite material, wherein the micron-sized polystyrene resin and the low-density polyethylene resin are crosslinked with each other to form a composite material XLPE-PS;
and 7, degassing and removing byproducts.
In the preparation method, the low-density polyethylene resin is particles, and the density of the particles is 0.92g/cm 3 Having a weight average molecular weight of 14X 10 4 。
In the preparation method, in the step 3, the rotating speed of the double-screw extruder is 50-80r/min, the double-screw extruder is evenly mixed and granulated at 140-220 ℃, and the temperature of each section of the screw is set as follows: the feeding section 130-140 ℃, the conveying section 140-160 ℃, the melting section 160-180 ℃, the machine head 220 ℃, the extrusion line, after water cooling, air-drying and granulating to obtain the granules.
In the preparation method, the granules are mixed with dicumyl peroxide and then baked for 24 hours at 70 ℃ to accelerate blending.
In the preparation method, the micron-sized polystyrene resin and the low-density polyethylene resin are subjected to crosslinking reaction, wherein the condition of the crosslinking reaction is that the crosslinking temperature is 180 ℃, the time is 10min, and the pressure is 15MPa.
In the preparation method, in the step 7, degassing is carried out at 70-90 ℃.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, micron-sized PS is added, LDPE and PS are mixed and crosslinked, so that the breakdown field strength of XLPE at different temperatures is effectively improved by 15% -30%, the carrier mobility is reduced, and the high-temperature conductivity stability of XLPE is improved. According to the invention, through a crosslinking mode between composite materials, the insulation performance and the temperature stability of the material are effectively improved by adding the micron-sized PS. The enhancement of the crosslinking mechanism of the present invention improves dielectric strength and structural characteristics. The effect of polystyrene on structural properties is demonstrated in terms of structural properties such as crystallinity, grain size, degree of crosslinking, flake thickness, and enthalpy of fusion. The synergistic effect with PS in the preparation method is beneficial to improving dielectric strength and structural characteristics. The XLPE-PS composite material provides a method which is low in cost and better in improvement of XLPE breakdown performance and high-temperature insulation stability, and has obvious engineering significance.
The description is merely an overview of the technical solutions of the present invention, in order to make the technical means of the present invention more clearly apparent to those skilled in the art, and in order to make the description of the present invention and other objects, features and advantages of the present invention more obvious, the following description of the specific embodiments of the present invention will be exemplified.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is evident that the figures described below are only some embodiments of the invention, from which other figures can be obtained without inventive effort for a person skilled in the art. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
FIG. 1 is a schematic diagram of blending LDPE with an antioxidant;
FIG. 2 is a schematic diagram of blending LDPE with PS;
FIG. 3 is a schematic illustration of melt blending using a twin screw extruder;
FIG. 4 is a schematic view of the degassing of pellets in an oven;
FIG. 5 is a schematic diagram of blending LDPE with DCP;
FIG. 6 is a comparative schematic diagram of pellets of different proportions prior to compression;
FIG. 7 is the effect of different PS additions at different temperatures on XLPE breakdown performance;
FIG. 8 is a graph showing the effect of PS additions at different levels of PS on XLPE conductivity at 70deg.C;
FIG. 9 is a graph showing the effect of PS additions at 90℃on XLPE conductivity at different field strengths.
The invention is further explained below with reference to the drawings and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will understand that a person may refer to the same component by different names. The description and claims do not identify differences in terms of components, but rather differences in terms of the functionality of the components. As used throughout the specification and claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description hereinafter sets forth a preferred embodiment for practicing the invention, but is not intended to limit the scope of the invention, as the description proceeds with reference to the general principles of the description. The scope of the invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the invention, reference will now be made to the drawings of several embodiments illustrated in the drawings, and the accompanying drawings are not to be taken as limiting the embodiments of the invention.
For better understanding, as shown in fig. 1 to 9, a high voltage dc cable insulation composite includes,
the high-voltage direct-current cable insulation composite material consists of a main material and auxiliary materials, wherein the main material is low-density polyethylene resin, and the auxiliary materials comprise micron-sized polystyrene resin, a cross-linking agent and an antioxidant, wherein the micron-sized polystyrene resin and the low-density polyethylene resin are cross-linked with each other to form the composite material XLPE-PS.
In a preferred embodiment of the high-voltage direct-current cable insulation composite, the high-voltage direct-current cable insulation composite comprises the following components in parts by weight:
1) 100 parts of low-density polyethylene resin;
2) 0.1-0.5 part of antioxidant;
3) 2 parts of dicumyl peroxide;
4) 0.1-5 parts of micron-sized polystyrene resin.
In the preferred embodiment of the high voltage direct current cable insulation composite material, the micron-sized polystyrene resin is a powder material with the particle size of 5-500 mu m.
In the preferred embodiment of the high-voltage direct-current cable insulation composite material, the antioxidant is one or more selected from the group consisting of antioxidant 168, antioxidant 264, antioxidant 300, antioxidant 1010, antioxidant 1024, antioxidant 1035, antioxidant BHT and DNP.
The preparation method of the high-voltage direct-current cable insulation composite material comprises the following steps,
step 1, proportioning according to a formula of 100 parts of low-density polyethylene resin, 0.1-0.5 part of antioxidant, 2 parts of dicumyl peroxide and 0.1-5 parts of micron-sized polystyrene resin;
step 2, mixing the low-density polyethylene resin, the antioxidant and the micron-sized polystyrene resin according to the proportion to form a mixture;
step 3, melting the mixture at high temperature by using a double-screw extruder, and preparing into granules;
step 4, baking or air-drying to remove the mixed moisture of the granules during the preparation of the materials;
step 5, blending the granules and dicumyl peroxide according to a proportion;
step 6, crosslinking is completed at high temperature and high pressure to obtain a high-voltage direct current cable insulation composite material, wherein the micron-sized polystyrene resin and the low-density polyethylene resin are crosslinked with each other to form a composite material XLPE-PS;
and 7, degassing and removing byproducts.
In a preferred embodiment of the production method, the low-density polyethylene resin is in the form of particles having a density of 0.92g/cm 3 Having a weight average molecular weight of 14X 10 4 。
In the preferred embodiment of the preparation method, in the step 3, the rotating speed of the double-screw extruder is 50-80r/min, the double-screw extruder is uniformly mixed and granulated at 140-220 ℃, and the temperature of each section of the screw is set as follows: the feeding section 130-140 ℃, the conveying section 140-160 ℃, the melting section 160-180 ℃, the machine head 220 ℃, the extrusion line, after water cooling, air-drying and granulating to obtain the granules.
In a preferred embodiment of the preparation process, the pellets are mixed with dicumyl peroxide and then baked at 70℃for 24 hours to accelerate blending.
In a preferred embodiment of the preparation method, the micron-sized polystyrene resin and the low-density polyethylene resin are subjected to a crosslinking reaction, wherein the condition of the crosslinking reaction is that the crosslinking temperature is 180 ℃, the time is 10min, and the pressure is 15MPa.
In a preferred embodiment of the preparation process, in step 7, the degassing is carried out at a temperature of from 70 to 90 ℃.
In one embodiment, 100 parts of low-density polyethylene, 0.1-0.5 part of antioxidant, 2 parts of dicumyl peroxide and 0.1-5 parts of micron-sized polystyrene powder are selected. In the step 2, LDPE needs to be mixed with antioxidant and PS before extrusion, in the step 3, mixing and granulating are carried out uniformly at 140-220 ℃, and further, the temperature of each section of the screw is set as follows: the feeding section is 130-140 ℃, the conveying section is 140-160 ℃, the melting section is 160-180 ℃, the machine head is 220 ℃, and the rotating speed of the double-screw extruder is 50-80r/min. Preferably, step 4 is kept at a constant temperature in an oven at 70 ℃ for 3 hours to remove the moisture mixed in the material during the preparation. Of these, it is preferable that, after adding DCP, step 5, the pellets should be baked in an oven at 70℃for 24 hours to uniformly mix with DCP. In the step 6, the preheating temperature is 120 ℃, the time is 5min, the pressure is 10MPa, and the crosslinking temperature is 180 ℃ for 10min and the pressure is 15MPa.
Preferably, in step 7, the oven is set at 70℃and deaerated for 36 hours.
In the temperature range from room temperature to the working temperature of the cable, the breakdown field strength of the insulating material is not high enough, and the temperature stability is poor. The invention utilizes the addition of micron-sized PS material and LDPE to form a novel XLPE-PS material by composite crosslinking, the cable insulation composite material is prepared from low-density polyethylene resin as a main material and polystyrene, dicumyl peroxide and an antioxidant as auxiliary materials.
In this embodiment of the present invention, the high-voltage dc cable insulation material may include the following components in parts by weight, and particularly the following components may be selected:
100 parts of low-density polyethylene;
0.1-0.5 part of antioxidant;
2 parts of dicumyl peroxide;
0.1-5 parts of polystyrene.
And provides a detailed manufacturing flow:
proportioning according to the formula;
mixing LDPE, an antioxidant and micron-sized PS according to a proportion;
melting the mixture at high temperature by using a double-screw extruder to prepare standard granules;
baking or air drying to remove the mixed moisture during the material preparation;
blending the prepared pellets with DCP;
crosslinking is completed under high temperature and high pressure;
degassing and removing by-products.
The following details the proportions, flow, and invention benefits etc. with reference to examples.
Example 1
The high-voltage direct-current cable insulating material comprises the following raw materials in parts by mass:
1) 100 parts of low-density polyethylene;
2) Antioxidant 300 (C) 22 H 30 O 2 S) 0.2 part;
3) 2 parts of dicumyl peroxide;
4) Polystyrene 0.5 parts.
According to the proportion, LDPE, PS, DCP and antioxidant 300 with corresponding weights are weighedFirstly, preprocessing LDPE by using a baking oven, removing moisture by using the baking oven, uniformly mixing the LDPE and the antioxidant 300, preparing granules by using an extruder, putting the blended granules of the LDPE and the antioxidant into the baking oven, and baking for 3 hours at the temperature of 70 ℃. The mixed antioxidant can prevent the material from accelerating oxidation at high temperature. Mixing micron-sized PS, pretreated LDPE and antioxidant granules, preparing the mixture into granules by using an extruder, putting the granules into a baking oven, baking the materials for 3 hours at the temperature of 70 ℃, and removing water in the PS by heat treatment. When the LDPE and the antioxidant are mixed by a double-screw extruder, wherein the temperature of a feeding section is 140 ℃, the temperature of a conveying section is 160 ℃, the temperature of a melting section is 180 ℃ and the temperature of a machine head is 180 ℃; when PS is mixed by a double-screw extruder, the torque and the rotating speed of the extruder are set to be 30 N.m at 140 ℃ in a feeding section, 160 ℃ in a conveying section, 180 ℃ in a melting section and 220 ℃ in a machine head, so as to ensure the uniformity of extruded granules. After the pellets were prepared, DCP was added and baked in an oven at 70℃for 24 hours to allow uniform mixing. Thereafter, a sheet-like specimen of XLPE-PS composite material was prepared by a hot press method, and 100X 1mm was selected 3 And 100X 0.2mm 3 The mould is preheated to 120 ℃ for 5min at 10MPa, crosslinked at 180 ℃ for 10min at 15MPa, cooled by water and demoulded. The sample was prepared and placed in an oven at 70℃for 36 hours to degas and remove by-products.
Example 2
The high-voltage direct-current cable insulating material comprises the following raw materials in parts by mass:
1) 100 parts of low-density polyethylene;
2) Antioxidant 300 (C) 22 H 30 O 2 S) 0.2 part;
3) 2 parts of dicumyl peroxide;
4) 1 part of polystyrene.
According to the proportion, LDPE, PS, DCP and antioxidant 300 with corresponding weights are weighed, firstly, the LDPE is pretreated by a baking oven, after moisture is removed by the baking oven, the LDPE and the antioxidant 300 are uniformly mixed, and are made into granules by an extruder, and the granules obtained by blending the LDPE and the antioxidant are put into the baking oven, and baked for 3 ℃ at the temperature of 70 DEG CHours. The mixed antioxidant can prevent the material from accelerating oxidation at high temperature. Mixing micron-sized PS, pretreated LDPE and antioxidant granules, preparing the mixture into granules by using an extruder, putting the granules into a baking oven, baking the materials for 3 hours at the temperature of 70 ℃, and removing water in the PS by heat treatment. When the LDPE and the antioxidant are mixed by a double-screw extruder, wherein the temperature of a feeding section is 140 ℃, the temperature of a conveying section is 160 ℃, the temperature of a melting section is 180 ℃ and the temperature of a machine head is 180 ℃; when PS is mixed by a double-screw extruder, the torque and the rotating speed of the extruder are set to be 30 N.m at 140 ℃ in a feeding section, 160 ℃ in a conveying section, 180 ℃ in a melting section and 220 ℃ in a machine head, so as to ensure the uniformity of extruded granules. After the pellets were prepared, DCP was added and baked in an oven at 70℃for 24 hours to allow uniform mixing. Thereafter, a sheet-like specimen of XLPE-PS composite material was prepared by a hot press method, and 100X 1mm was selected 3 And 100X 0.2mm 3 The mould is preheated to 120 ℃ for 5min at 10MPa, crosslinked at 180 ℃ for 10min at 15MPa, cooled by water and demoulded. The sample was prepared and placed in an oven at 70℃for 36 hours to degas and remove by-products.
Example 3
The high-voltage direct-current cable insulating material comprises the following raw materials in parts by mass:
1) 100 parts of low-density polyethylene;
2) Antioxidant 300 (C) 22 H 30 O 2 S) 0.2 part;
3) 2 parts of dicumyl peroxide;
4) 2 parts of polystyrene.
According to the proportion, LDPE, PS, DCP and antioxidant 300 with corresponding weights are weighed, firstly, the LDPE is pretreated by a baking oven, after moisture is removed by the baking oven, the LDPE and the antioxidant 300 are uniformly mixed, and are made into granules by an extruder, and the granules obtained by mixing the LDPE and the antioxidant are put into the baking oven, and are baked for 3 hours at the temperature of 70 ℃. The mixed antioxidant can prevent the material from accelerating oxidation at high temperature. Mixing micron PS, pretreated LDPE and antioxidant granules, preparing the mixture into granules by using an extruder, and placing the granules into a baking oven, wherein the baking oven is baked for 3 hours at the temperature of 70 DEG CWhen heat treatment is performed, moisture in PS can be removed. When the LDPE and the antioxidant are mixed by a double-screw extruder, wherein the temperature of a feeding section is 140 ℃, the temperature of a conveying section is 160 ℃, the temperature of a melting section is 180 ℃ and the temperature of a machine head is 180 ℃; when PS is mixed by a double-screw extruder, the torque and the rotating speed of the extruder are set to be 30 N.m at 140 ℃ in a feeding section, 160 ℃ in a conveying section, 180 ℃ in a melting section and 220 ℃ in a machine head, so as to ensure the uniformity of extruded granules. After the pellets were prepared, DCP was added and baked in an oven at 70℃for 24 hours to allow uniform mixing. Thereafter, a sheet-like specimen of XLPE-PS composite material was prepared by a hot press method, and 100X 1mm was selected 3 And 100X 0.2mm 3 The mould is preheated to 120 ℃ for 5min at 10MPa, crosslinked at 180 ℃ for 10min at 15MPa, cooled by water and demoulded. The sample was prepared and placed in an oven at 70℃for 36 hours to degas and remove by-products.
Comparative examples 1, 2, 3 and commercial XLPE, after melt blending, PS and LDPE were finished to compare breakdown performance with thermal stability, and fig. 7 shows that the composite cross-linking after addition of the micron-sized PS significantly improved the breakdown field strength of the material at each temperature, with a 27.5% improvement at 30 ℃ and a 16.4% improvement at 90 ℃ compared to XLPE without PS addition. In terms of temperature stability, it can be seen from fig. 8 that the conductivity of the material changes smoothly with the field strength at 70 ℃ after PS is added, while fig. 9 shows that the conductivity is reduced at 90 ℃ at different field strengths by PS addition, and the insulation performance is improved.
The basic principles of the present application have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not limiting, and these advantages, benefits, effects, etc. are not to be considered as necessarily possessed by the various embodiments of the present application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not intended to be limited to the details disclosed herein as such.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (8)
1. The high-voltage direct-current cable insulation composite material is characterized by comprising a main material and auxiliary materials, wherein the main material is low-density polyethylene resin, and the auxiliary materials comprise micron-sized polystyrene resin, a cross-linking agent and an antioxidant, wherein the micron-sized polystyrene resin and the low-density polyethylene resin are cross-linked with each other to form the composite material XLPE-PS.
2. The high voltage direct current cable insulation composite of claim 1, wherein preferably the high voltage direct current cable insulation composite comprises the following components in parts by weight:
1) 100 parts of low-density polyethylene resin;
2) 0.1-0.5 part of antioxidant;
3) 2 parts of dicumyl peroxide;
4) 0.1-5 parts of micron-sized polystyrene resin.
3. The high voltage direct current cable insulation composite of claim 1 wherein the micron-sized polystyrene resin is a powder material having a particle size of 5-500 μm.
4. The high voltage direct current cable insulation composite material according to claim 1, wherein the antioxidant is selected from one or more of antioxidant 168, antioxidant 264, antioxidant 300, antioxidant 1010, antioxidant 1024, antioxidant 1035, antioxidant BHT and DNP.
5. A process for the preparation of a high voltage DC cable insulation composite according to any of the claims 1-4, comprising the steps of,
step 1, proportioning according to a formula of 100 parts of low-density polyethylene resin, 0.1-0.5 part of antioxidant, 2 parts of dicumyl peroxide and 0.1-5 parts of micron-sized polystyrene resin;
step 2, mixing the low-density polyethylene resin, the antioxidant and the micron-sized polystyrene resin according to the proportion to form a mixture;
step 3, melting the mixture at high temperature by using a double-screw extruder, and preparing into granules;
step 4, baking or air-drying to remove the mixed moisture of the granules during the preparation of the materials;
step 5, blending the granules and dicumyl peroxide according to a proportion;
step 6, crosslinking is completed at high temperature and high pressure to obtain a high-voltage direct current cable insulation composite material, wherein the micron-sized polystyrene resin and the low-density polyethylene resin are crosslinked with each other to form a composite material XLPE-PS;
and 7, degassing and removing byproducts.
6. The process of claim 5, wherein the pellets are mixed with dicumyl peroxide and then baked at 70 ℃ for 24 hours to accelerate blending.
7. The method of claim 5, wherein the crosslinking reaction is carried out between the micron-sized polystyrene resin and the low-density polyethylene resin, wherein the crosslinking reaction is carried out at 180 ℃ for 10min at 15MPa.
8. The process according to claim 5, wherein in step 7, the degassing is carried out at 70 to 90 ℃.
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