CN117362802A - Universal insulating material for AC/DC cables and preparation method thereof - Google Patents
Universal insulating material for AC/DC cables and preparation method thereof Download PDFInfo
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- CN117362802A CN117362802A CN202311399566.1A CN202311399566A CN117362802A CN 117362802 A CN117362802 A CN 117362802A CN 202311399566 A CN202311399566 A CN 202311399566A CN 117362802 A CN117362802 A CN 117362802A
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- 239000011810 insulating material Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000004927 clay Substances 0.000 claims abstract description 37
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 15
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 14
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 14
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 13
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 13
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 9
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000009826 distribution Methods 0.000 claims abstract description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 235000019441 ethanol Nutrition 0.000 claims description 7
- 239000002105 nanoparticle Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 125000002081 peroxide group Chemical group 0.000 claims 1
- 239000011164 primary particle Substances 0.000 claims 1
- 238000009825 accumulation Methods 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 238000004381 surface treatment Methods 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 16
- 239000012774 insulation material Substances 0.000 description 10
- 229920003020 cross-linked polyethylene Polymers 0.000 description 7
- 239000004703 cross-linked polyethylene Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000001132 ultrasonic dispersion Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910021642 ultra pure water Inorganic materials 0.000 description 2
- 239000012498 ultrapure water Substances 0.000 description 2
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- KRDXTHSSNCTAGY-UHFFFAOYSA-N 2-cyclohexylpyrrolidine Chemical compound C1CCNC1C1CCCCC1 KRDXTHSSNCTAGY-UHFFFAOYSA-N 0.000 description 1
- TVWGHFVGFWIHFN-UHFFFAOYSA-N 2-hexadecan-2-yl-4,6-dimethylphenol Chemical compound CCCCCCCCCCCCCCC(C)C1=CC(C)=CC(C)=C1O TVWGHFVGFWIHFN-UHFFFAOYSA-N 0.000 description 1
- QKMWRVRRLVXWOP-UHFFFAOYSA-N 3-butan-2-yl-2,6-ditert-butylphenol Chemical compound CCC(C)c1ccc(c(O)c1C(C)(C)C)C(C)(C)C QKMWRVRRLVXWOP-UHFFFAOYSA-N 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000002978 peroxides Chemical group 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2206—Oxides; Hydroxides of metals of calcium, strontium or barium
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- 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
- C08K2201/011—Nanostructured additives
-
- 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
-
- 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
- C08L2207/062—HDPE
-
- 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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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Organic Insulating Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a universal insulating material for AC and DC cables and a preparation method thereof, wherein the insulating material comprises the following components in parts by mass: 100 parts of base resin, 0.4-0.8 part of nano-scale clay, 0.12-0.24 part of liquid antioxidant and 1.2-1.6 parts of cross-linking agent. The general insulating material for the AC/DC cable has the thermal extension performance meeting the standard requirement of the high-voltage AC cable, has excellent AC/DC electrical performance, has lower dielectric constant and dielectric loss tangent angle, and can effectively inhibit the injection and accumulation of space charges in the insulating material. The nano-grade clay is subjected to surface treatment of amphiphilic molecule octadecanol polyethylene glycol ether, and has good dispersion and distribution in low-density polyethylene.
Description
Technical Field
The invention relates to an insulating material and a preparation method thereof, in particular to a universal insulating material for AC and DC cables and a preparation method thereof.
Background
The alternating current cable insulation material is formed by polymerizing monomer raw materials through synthesis or condensation reaction, and the alternating current cable insulation material with the most wide application range is crosslinked polyethylene (XLPE) insulation, and is generally composed of basic resin, antioxidant, crosslinking agent and other components. Under the action of high-voltage direct current, space charges are easy to accumulate in XLPE insulation, and local electric fields are distorted along with continuous accumulation of the space charges, so that the maximum electric field in the XLPE is 5-11 times higher than the average electric field, and even insulation electric breakdown is caused in severe cases, therefore, the alternating current cable insulation material cannot be used on direct current cables.
The direct-current cable insulating material adopts modified XLPE insulation, has a good space charge inhibition effect, and has the technical route mainly comprising two modes of ultra-pure ultra-clean and nano doping. The direct current cable insulation material of the ultra-pure ultra-clean technical route realizes space charge inhibition by a method of reducing the contents of a cross-linking agent and an antioxidant, but has lower cross-linking degree, the working temperature is only 70 ℃, and the working temperature of an alternating current cable is 90 ℃, so that the ultra-pure ultra-clean direct current cable insulation material cannot be used on the alternating current cable. The space of the direct current cable insulating material of the conventional nano doping route is restrained by a method of adding nano particles, but after the nano particles are added, the dielectric constant and the dielectric loss tangent angle of the insulating material can be increased, and the loss is larger under an alternating current electric field, so that the direct current cable insulating material cannot be used on an alternating current cable.
Clay is often used for improving the heat resistance and mechanical property of the material, and researches show that the clay can also improve the dielectric breakdown property of the epoxy composite material, but reports of improving the electrical property of the XLPE cable insulating material by adopting nano-scale clay are not yet seen.
Disclosure of Invention
The invention aims to: the invention aims to provide an universal insulating material for AC/DC cables, which has excellent AC/DC electrical properties, and has thermal elongation performance meeting the standard requirements of high-voltage AC cables;
the second purpose of the invention is to provide a preparation method of the general insulating material for the AC/DC cable.
The technical scheme is as follows: the invention relates to a general insulating material for an AC/DC cable, which comprises the following components in parts by mass: 100 parts of base resin, 0.4-0.8 part of nano-scale clay, 0.12-0.24 part of liquid antioxidant and 1.2-1.6 parts of cross-linking agent.
Wherein the nano-scale clay is prepared by surface modification of amphiphilic molecule octadecanol polyethylene glycol ether.
Wherein the mass ratio of the amphiphilic molecule octadecanol polyethylene glycol ether to the nanoscale clay is 1.5:100-2:100.
Wherein the nano-scale clay comprises the following components in percentage by mass: 45wt% CaO,40wt% SiO 2 5wt% of Al 2 O 3 5wt% Na 2 O,5wt% others.
Wherein the original particle size of the nano-scale clay is 20+/-2 nm.
Wherein the surface modification process is as follows: dissolving amphiphilic molecule octadecanol polyethylene glycol ether in an organic solvent, stirring under heating, adding nano-scale clay, continuously stirring, dispersing by ultrasonic wave, standing, heating to volatilize ethanol, and finally drying to obtain the surface modified nano-scale clay.
Wherein, the surface modification process is specifically as follows: dissolving amphiphilic molecular octadecanol polyethylene glycol ether in absolute ethyl alcohol, fully and uniformly stirring at 60-64 ℃, adding nano-grade clay, continuously stirring at 60-64 ℃ for 40-50 min, then dispersing by ultrasonic waves for 40-50 min, standing for 1.5-2 h, stirring at 76-80 ℃ to remove the ethanol, and finally drying at 91-95 ℃ for 36-48 h.
Wherein the base resin is low-density polyethylene, the number average molecular weight is 12000-18000, preferably 16000, the molecular weight distribution width is 4.2-5.8, preferably 5.2, and the melting temperature is 105-108 ℃, preferably 106 ℃.
Wherein the melting point of the liquid antioxidant is 0-25 ℃; the cross-linking agent is peroxide cross-linking agent, and the decomposition temperature is more than 115 ℃.
The preparation method of the universal insulating material for the AC/DC cable comprises the following steps:
respectively adding the base resin, the liquid antioxidant and the cross-linking agent into a double-screw extruder through a main feeding port, conveying the nano-grade clay to the double-screw extruder through a side feeding machine, and completing mixing and dispersing of raw materials in the double-screw extruder at one time, wherein the mixing temperature is 120-125 ℃, preferably 122 ℃; pressurizing by a melt pump, precisely filtering by a multi-layer filter screen, granulating, and drying to obtain the universal insulating material for the AC/DC cable.
Wherein the metering precision of each raw material is not lower than +/-0.08%; precisely filtering by a multi-layer filter screen with 300 meshes or more of a continuous screen changer; granulating in deionized ultrapure water environment by an underwater granulator, and drying by a dryer until the water content is less than or equal to 200ppm, preferably until the water content is 150ppm.
Further, before raw materials are proportioned and mixed, cleaning the whole preparation environment and starting a hundred-grade clean system to continuously run for not less than 48 hours; the material conveying process is airtight, and the cleanliness of conveying gas meets hundred grades.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable effects: (1) The general insulating material for the AC/DC cable has the thermal extension performance meeting the standard requirement of the high-voltage AC cable, has excellent AC/DC electrical performance, has lower dielectric constant and dielectric loss tangent angle, and can effectively inhibit the injection and accumulation of space charges in the insulating material. (2) The nano-grade clay is subjected to surface treatment of amphiphilic molecule octadecanol polyethylene glycol ether, and has good dispersion and distribution in low-density polyethylene. (3) The preparation process is simple, and the preparation process is clean and has no impurity influence.
Drawings
FIG. 1 is a transmission electron microscope image of a surface treated nanoscale clay dispersed in a low density polyethylene;
FIG. 2 is a space charge diagram of insulating material 1# of example 1 at-20 kV/mm, 20 ℃;
FIG. 3 is a space charge diagram of insulating material 2# of example 2 at-20 kV/mm, 20 ℃;
FIG. 4 is a space charge diagram of insulating material 3# of example 3 at-20 kV/mm, 20 ℃;
FIG. 5 is a space charge diagram of insulating material 1' # of comparative example 1 at-20 kV/mm, 20 ℃;
FIG. 6 is a space charge diagram of insulating material 2' # of comparative example 2 at-20 kV/mm, 20 ℃;
FIG. 7 is a space charge diagram of insulating material 3' # of comparative example 3 at-20 kV/mm, 20 ℃;
FIG. 8 is a space charge diagram of the insulating material 4' # of comparative example 4 at-20 kV/mm and 20 ℃.
Detailed Description
The present invention is described in further detail below.
Example 1
The universal insulating material for the AC/DC cable comprises the following components in parts by mass: 100 parts of base resin low-density polyethylene, 0.4 part of modified nanoscale clay, 0.12 part of antioxidant 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane and 1.2 parts of cross-linking agent dibenzoyl peroxide.
The preparation process of the modified nano-scale clay comprises the following steps:
dissolving 1.5 parts by mass of amphiphilic molecule octadecanol polyethylene glycol ether into absolute ethyl alcohol, fully and uniformly stirring at 60 ℃, adding 100 parts by mass of nano-grade clay, continuously stirring at 60 ℃ for 40min, performing ultrasonic dispersion for 40min, standing for 1.5h, stirring at 76 ℃ to remove the ethanol, and finally drying at 91 ℃ for 36h.
As shown in fig. 1, the nano-sized clay subjected to surface treatment of amphiphilic molecule octadecanol polyethylene glycol ether is uniformly dispersed and distributed in low-density polyethylene.
The preparation method of the DC cable insulating material comprises the following steps:
thoroughly cleaning the whole preparation environment, starting a hundred-grade clean system to continuously run for not less than 48 hours, respectively adding base resin, an antioxidant and a cross-linking agent into a double-screw extruder through a main feeding port according to the dosage of the formula, conveying nano-grade clay to the double-screw extruder through a side feeding machine, accurately metering the nano-grade clay through a weightless scale, completing mixing and dispersing of raw materials in the double-screw extruder at one time, wherein the mixing temperature is 122 ℃; pressurizing by a melt pump, precisely filtering by a multi-layer filter screen with 300 meshes or more of a continuous screen changer, granulating in deionized ultrapure water environment by an underwater granulator, drying by a dryer until the water content is 150ppm, and conveying to a storage tank. The whole conveying process is airtight, and the cleanliness of conveying gas is required to meet hundred grades.
Example 2
On the basis of the embodiment 1, the general insulating material for the AC/DC cable is different from the embodiment 1, and comprises the following components in parts by mass: 100 parts of base resin low-density polyethylene, 0.6 part of modified nanoscale clay, 0.18 part of antioxidant 2, 4-dimethyl-6- (1-methylpentadecyl) -phenol and 1.4 parts of cross-linking agent tert-butyl cumyl peroxide.
The preparation process of the modified nano-scale clay comprises the following steps:
2 parts by mass of amphiphilic molecule octadecanol polyethylene glycol ether are taken to be dissolved in absolute ethyl alcohol, fully and uniformly stirred at 64 ℃, 100 parts by mass of nano-grade clay is added, stirring is continued for 50min at 64 ℃, then ultrasonic dispersion is carried out for 50min, standing is carried out for 2h, stirring is carried out at 80 ℃ to remove the ethanol, and finally drying is carried out at 91 ℃ for 48h.
Example 3
On the basis of the embodiment 1, the general insulating material for the AC/DC cable is different from the embodiment 1, and comprises the following components in parts by mass: 100 parts of base resin low-density polyethylene, 0.8 part of nano-scale clay, 0.24 part of antioxidant sec-butyl-2, 6-di-tert-butylphenol and 1.6 parts of crosslinking agent dicumyl peroxide.
Dissolving 1.8 parts by mass of amphiphilic molecule octadecanol polyethylene glycol ether into absolute ethyl alcohol, fully and uniformly stirring at 62 ℃, adding 100 parts by mass of nano-grade clay, continuously stirring at 62 ℃ for 45min, performing ultrasonic dispersion for 45min, standing for 1.8h, stirring at 78 ℃ to remove the ethanol, and finally drying at 93 ℃ for 42h.
Comparative example 1
Using high-voltage ac cable insulation.
Comparative example 2
A direct current cable insulation material adopting an ultra-pure ultra-clean technical route is adopted.
Comparative example 3
The DC cable insulation material adopting the conventional nano-doping route is adopted.
Comparative example 4
Cable insulation material doped with non-surface treated nano-sized clay is used.
The mechanical properties and electrical properties of the insulating materials prepared in examples 1 to 3 and comparative examples 1, 2, 3 and 4 were measured, and the results are shown in tables 1, 2 and fig. 2 to 7. It can be seen from fig. 2-7 that the other samples all had good space charge properties except for the obvious space injection of comparative example 1.
TABLE 1 mechanical and electrical Property test results of the insulation materials prepared in examples 1 to 3
Table 2 test results of mechanical properties and electrical properties of the insulation materials prepared in comparative examples 1, 2, 3, and 4
According to the data in tables 1 and 2, the performances of the insulating materials obtained in examples 1-3, such as volume resistivity, tensile strength, elongation at break and the like, are similar to those of the comparative examples, and all meet the performance requirements of the insulating materials for 500kV crosslinked polyethylene insulated cables in the GB/T22078.2 standard. Compared with the sample of comparative example 1, each example not only has equivalent dielectric constant, dielectric loss tangent and thermal elongation properties, but also can effectively inhibit the injection and accumulation of space charges in the insulating material, while the sample of comparative example 2 has insufficient crosslinking degree, the thermal elongation properties do not meet the standard requirements of the alternating current cable, the sample of comparative example 3 has poorer dielectric properties, in particular the dielectric loss tangent is significantly higher than the values specified by the standard of the alternating current cable, and the sample of comparative example 4 has relatively poorer mechanical properties.
Claims (10)
1. The universal insulating material for the AC/DC cable is characterized by comprising the following components in parts by mass: 100 parts of base resin, 0.4-0.8 part of nano-scale clay, 0.12-0.24 part of liquid antioxidant and 1.2-1.6 parts of cross-linking agent.
2. The universal insulating material for ac/dc cables according to claim 1, wherein the nano-sized clay is prepared by surface modification of amphiphilic molecule octadecanol polyethylene glycol ether.
3. The universal insulating material for ac/dc cables according to claim 2, wherein the mass ratio of the amphiphilic molecule octadecanol polyethylene glycol ether to the nano-scale clay is 1.5:100-2:100.
4. The universal insulating material for ac/dc cables according to claim 1, wherein the nano-sized clay comprises the following components in percentage by mass: 45wt% CaO,40wt% SiO 2 5wt% of Al 2 O 3 5wt% Na 2 O,5wt% others.
5. The universal insulating material for ac/dc cables according to claim 1, wherein the nano-sized clay has a primary particle size of 20±2nm.
6. The universal insulating material for ac/dc cables according to claim 2, wherein the surface modification process is as follows: dissolving amphiphilic molecule octadecanol polyethylene glycol ether in absolute ethyl alcohol, stirring under heating, adding nano-scale clay, continuously stirring, dispersing by ultrasonic wave, standing, heating to volatilize the ethyl alcohol, and finally drying to obtain the surface modified nano-scale clay.
7. The universal insulating material for ac/dc cables according to claim 6, wherein the surface modification process is specifically as follows: dissolving amphiphilic molecular octadecanol polyethylene glycol ether in absolute ethyl alcohol, fully and uniformly stirring at 60-64 ℃, adding nano-grade clay, continuously stirring at 60-64 ℃ for 40-50 min, then dispersing by ultrasonic waves for 40-50 min, standing for 1.5-2 h, stirring at 76-80 ℃ to remove the ethanol, and finally drying at 91-95 ℃ for 36-48 h.
8. The universal insulating material for ac and dc cables according to claim 1, wherein the base resin is low density polyethylene, has a number average molecular weight of 12000-18000, a molecular weight distribution width of 4.2-5.8, and a melting temperature of 105-108 ℃.
9. The universal insulating material for ac/dc cables according to claim 1, wherein the liquid antioxidant has a melting point of 0 to 25 ℃; the cross-linking agent is peroxide cross-linking agent, and the decomposition temperature is more than 115 ℃.
10. A method for preparing the universal insulating material for the ac/dc cable according to claim 1, comprising the following steps:
respectively adding the base resin, the liquid antioxidant and the cross-linking agent into a double-screw extruder through a main feeding port, conveying the nano-grade clay to the double-screw extruder through a side feeding machine, and completing mixing and dispersing of raw materials in the double-screw extruder at a time, wherein the mixing temperature is 120-125 ℃; pressurizing by a melt pump, precisely filtering by a multi-layer filter screen, granulating, and drying to obtain the universal insulating material for the AC/DC cable.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311399566.1A CN117362802A (en) | 2023-10-26 | 2023-10-26 | Universal insulating material for AC/DC cables and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311399566.1A CN117362802A (en) | 2023-10-26 | 2023-10-26 | Universal insulating material for AC/DC cables and preparation method thereof |
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| Publication Number | Publication Date |
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| CN117362802A true CN117362802A (en) | 2024-01-09 |
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| CN202311399566.1A Pending CN117362802A (en) | 2023-10-26 | 2023-10-26 | Universal insulating material for AC/DC cables and preparation method thereof |
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| Country | Link |
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| CN (1) | CN117362802A (en) |
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