AU2020102278A4 - Preparation method of recyclable thermoplastic high-voltage direct-current cable nano composite insulating material - Google Patents
Preparation method of recyclable thermoplastic high-voltage direct-current cable nano composite insulating material Download PDFInfo
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- AU2020102278A4 AU2020102278A4 AU2020102278A AU2020102278A AU2020102278A4 AU 2020102278 A4 AU2020102278 A4 AU 2020102278A4 AU 2020102278 A AU2020102278 A AU 2020102278A AU 2020102278 A AU2020102278 A AU 2020102278A AU 2020102278 A4 AU2020102278 A4 AU 2020102278A4
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- 239000011810 insulating material Substances 0.000 title claims abstract description 36
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 31
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 31
- 239000002114 nanocomposite Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 31
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 31
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 31
- -1 polypropylene Polymers 0.000 claims abstract description 26
- 239000004743 Polypropylene Substances 0.000 claims abstract description 24
- 229920001155 polypropylene Polymers 0.000 claims abstract description 24
- 239000002105 nanoparticle Substances 0.000 claims abstract description 23
- 238000004381 surface treatment Methods 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 229920006124 polyolefin elastomer Polymers 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 14
- 239000003063 flame retardant Substances 0.000 claims abstract description 14
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 12
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 21
- 239000002244 precipitate Substances 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 11
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 claims description 8
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 229940075529 glyceryl stearate Drugs 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000001291 vacuum drying Methods 0.000 claims description 7
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 claims description 4
- 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 group 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 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical group [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 4
- 239000000347 magnesium hydroxide Substances 0.000 claims description 4
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 4
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical group CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims description 3
- 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 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 11
- 238000009825 accumulation Methods 0.000 abstract description 9
- 238000009826 distribution Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 102000020897 Formins Human genes 0.000 description 3
- 108091022623 Formins Proteins 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
- B29B7/005—Methods for mixing in batches
-
- 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
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
-
- 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
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
-
- 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
- H01B3/008—Other insulating material
-
- 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
- H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
- H01B3/22—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils hydrocarbons
-
- 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
-
- 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
Abstract
The disclosure relates to a preparation method of a recyclable thermoplastic
high-voltage direct-current cable nano composite insulating material, belonging to
the technical field of transmission equipment. The method comprises: mixing
isotactic polypropylene, a polyolefin elastomer, magnesium oxide nano particles
subjected to surface treatment, an antioxidant, a fire retardant and a processing aid
for 10~15 min at 180 °C ~200 °C at a rotation speed of 40~60 r/min to obtain the
recyclable thermoplastic high-voltage direct-current cable nano composite insulating
material. The recyclable thermoplastic high-voltage direct-current cable nano
composite insulating material provided by the disclosure uses a blend of isotactic
polypropylene and the polyolefin elastomer as a basic, the mechanical property of the
material is effectively improved by adding the polyolefin elastomer, and
accumulation of space charges can be well inhibited through addition of magnesium
oxide nano particles subjected to surface treatment. The insulating material prepared
by the method can tolerate high work intensity and work temperature, effectively
inhibit accumulation of space charges inside the material, and can be recycled after
the designed service life is reached without damaging environments.
1
1/1
Negative Negative
electrode electrode
30
- ---600s
20
-- 1800s
10
0 50 100 150 200 250
Thickness (pm)
Negative Negative
electrode electrode
30
10s•
20 -- - - -600 s
--- 1800s
.10
0
S .20
-30
0 50 100 150 200 250
Thickness (pm)
FIG.1
1
Description
1/1 Negative Negative electrode electrode 30 - - - -600s 20 -- 1800s
10
0 50 100 150 200 250 Thickness (pm)
0 Negative electrode Negative electrode 30 10s• 20 -- - - -600 s --- 1800s .10
S .20
-30 0 50 100 150 200 250 Thickness (pm)
FIG.1
[0001] The disclosure relates to a preparation method of a recyclable thermoplastic
high-voltage direct-current cable nano composite insulating material, belonging to
the technical field of transmission equipment.
[0002] Compared with the altemating-current transmission technology, a
direct-current transmission technology has many advantages, can save a lot of land
resources and has no system security problems and no large-scale cascading failure
risk. Therefore, the direct-current transmission technology will be widely used in the
aspect of long-distance, large-capacity and distributed energy transmission. The
direct-current transmission technology is also an effective way to reduce the
environmental impact of a power grid and improve the reliability of the power grid in
the future. At present, there are mainly two ways of power energy transmission: an
overhead transmission line and a cable line, wherein the cable line has the
advantages of line corridor economization and small electromagnetic environment
impact and is not easily disturbed by external environment. However, the extruded
plastic power cable is widely applied to power transmission and distribution
engineering due to its low price, convenient processing, good dielectric and
mechanical properties.
[0003] At present, the work temperature of the widely used extruded cross-linked
polyethylene insulated cable is generally 70 °C , which is difficult to meet the
requirements of high work temperature and high electric field intensity. Meanwhile, cross-linked polyethylene is a thermosetting material, which can not be recycled and difficultly degraded after its service life is expired so as to cause a lot of environmental pollution. The cross-linked polyethylene cable generates toxic byproducts during the processing, and the necessary cross-linking and degassing processes consume a large amount of energy.
[0004] Therefore, in order to further improve the work temperature and electric
field intensity tolerance of the direct-current cable insulating material and improve
the environmental friendliness of the cable insulating material, it is necessary to
develop a non cross-linked thermoplastic insulating material. It is well known that
space charge accumulation has a great impact on the long-term operation
performance of the direct-current cable insulating materials. The accumulation of
space charges can cause serious electric field distortion so that the maximum electric
field intensity in the insulating material is far higher than the actual applied electric
field intensity, thus causing the breakdown and destruction of a medium. Therefore,
the development of the direct-current cable insulating material must consider the
problem of space charge accumulation, inhibit the generation of space charge
accumulation to improve its long-term operation performance. As a thermoplastic
material, polypropylene is extremely easily recycled and reused after use, and has
good electrical property, and is a good insulating material base. However, the
mechanical property of polypropylene is slightly deficient, is brittle at low
temperature, and easily generates space charge accumulation under the action of
direct-current voltage. The disclosure hopes to develop a recyclable thermoplastic
high-voltage direct-current cable insulating material based on polypropylene as the
insulating material base by improving its mechanical property and space charge
accumulation characteristics.
[0005] The objective of the disclosure is to provide a preparation method of a
recyclable thermoplastic high-voltage direct-current cable nano composite insulating material in order to overcome the defects of the existing cross-linked polyethylene direct-current cables. The mechanical property and thermal property of polyethylene are improved by using polyolefin elastomers, and the magnesium oxide particles subjected to surface treatment are used to inhibit space charge accumulation, so as to prepare a thermoplastic nano composite material having good thermal property, mechanical property and electrical property to adapt to application requirements of large-volume high-voltage direct-current cables.
[0006] Provided is a preparation method of a recyclable thermoplastic high-voltage
direct-current cable nano composite insulating material, the preparation method
comprising the following steps:
[0007] (1) adding 2.5 parts of magnesium oxide nano particles and 5 parts of y-aminopropyltriethoxy silane into 100 parts of toluene solution, then heating to 120 °C under oil bath, reacting for 12 h under the condition of stirring, and
condensing and refluxing to obtain a suspension;
[0008] (2) putting the above suspension into a centrifugal machine to be centrifuged for 6 min at a rotation speed of 6000 r/min to obtain a precipitate, and drying the precipitate for 24 h in a vacuum drying oven at 80 °C to obtain
magnesium oxide particles subjected to surface treatment;
[0009] (3) mutually mixing isotactic polypropylene, a polyolefin elastomer, magnesium oxide nano particles subjected to surface treatment obtained in step (2), an antioxidant, a fire retardant and a processing aid to obtain a mixture, wherein the mixture respectively comprises the following various components in parts by mass:
[0010] isotactic polypropylene ~80 parts
[0011] polyolefin elastomer ~40 parts
[0012] magnesium oxide nano particles subjected to surface treatment 1~3 parts
[0013] antioxidant 0.5~1 part
[0014] fire retardant 2~5 parts
[0015] processing aid 0.5~1 part
[0016] (4) carrying out melt blending on the above mixture in an internal mixer for ~15 min at 180 °C ~200 °C at a rotation speed of 40~60 r/min to obtain the recyclable thermoplastic high-voltage direct-current cable nano composite insulating material.
[0017] Wherein, the density of isotactic polypropylene is 0.90~0.94 g/cm3 , the melt flow rate of isotactic polypropylene is 1.7-3.1 g/lOmin, and the isotacticity is more than 97%.
[0018] The particle size of the magnesium oxide nano particles subjected to surface treatment is 30-50 nm.
[0019] The polyolefin elastomer is an ethylene-octylene copolymer in which octylene is 20~30% in content and 0.85~0.88 g/cm3 in density.
[0020] The antioxidant is an antioxidant 1010, an antioxidant 2246 or an antioxidant 264.
[0021] The fire retardant is magnesium hydroxide, low-water zinc borate, aluminum hydroxide or antimonous oxide.
[0022] The processing aid is lubricating agent glyceryl stearate.
[0023] The preparation method of the recyclable thermoplastic high-voltage
direct-current cable nano composite insulating material provided by the disclosure has the advantages:
[0024] By utilizing the recyclable thermoplastic high-voltage direct-current cable
nano composite insulating material prepared by the disclosure, the polyolefin elastomer is added in the preparation process, thus improving the mechanical and thermal properties of polypropylene. The recyclable thermoplastic high-voltage direct-current cable nano composite insulating material has good flexibility at room temperature and good mechanical integrity at high temperature. Addition of magnesium oxide nano particles subjected to surface treatment improves the space charge inhibition capability of the material, thus improving electric field intensity tolerance. The blend of isotactic polypropylene and polyolefin elastomer used in the method of the disclosure does not undergo cross-linking treatment, so it continues to be recycled after use, which is conducive to environmental protection. The recyclable thermoplastic high-voltage direct-current cable nano composite insulating material prepared by the method can normally work at up to 100 °C, and meanwhile has good electrical performance, can significantly improve the work temperature and transmission capacity of the direct-current cable.
[0025] The recyclable thermoplastic high-voltage direct-current cable nano
composite insulation material prepared by the method of the disclosure is mainly
applied to electric energy transmission and distribution, but is not limited thereto.
Such the cable can also be used in the signal transmission cable, and can also be
recycled when the cable reaches the design service life to reduce the influence on the
environment.
[0026] Fig. 1 is a space charge distribution diagram of a material under the
-40kV/mm wherein (a) is a space charge distribution diagram of pure polypropylene,
and (b) is a space charge distribution diagram of a recyclable thermoplastic
high-voltage direct-current cable nano composite insulating material prepared by the
method of the disclosure.
[0027] The disclosure provides a preparation method of a recyclable thermoplastic
high-voltage direct-current cable nano composite insulating material, the method comprising the following steps:
[0028] (1) adding 2.5 parts of magnesium oxide nano particles and 5 parts of y-aminopropyltriethoxy silane into 100 parts of toluene solution, then heating to 120 °C under oil bath, reacting for 12 h under the condition of stirring, and condensing and refluxing to obtain a suspension;
[0029] (2) putting the above suspension into a centrifugal machine to be centrifuged for 6 min at a rotation speed of 6000 r/min to obtain a precipitate, and drying the precipitate for 24 h in a vacuum drying oven at 80 °C to obtain magnesium oxide particles subjected to surface treatment;
[0030] (3) mutually mixing isotactic polypropylene, a polyolefin elastomer, magnesium oxide nano particles subjected to surface treatment obtained in step (2), an antioxidant, a fire retardant and a processing aid to obtain a mixture, wherein the mixture respectively comprises the following various components in parts by mass:
[0031] isotactic polypropylene ~80 parts
[0032] polyolefin elastomer ~40 parts
[0033] magnesium oxide nano particles subjected to surface treatment 1~3 parts
[0034] antioxidant 0.5~1 part
[0035] fire retardant 2~5 parts
[0036] processing aid 0.5~1 part
[0037] (4) carrying out melt blending on the above mixture in an internal mixer for
~15 min at 180 °C ~200 °C at a rotation speed of 40~60 r/min to obtain the
recyclable thermoplastic high-voltage direct-current cable nano composite insulating material.
[0038] wherein, the density of isotactic polypropylene is 0.90~0.94 g/cm3 , the melt flow rate is 1.7-3.1 g/10min, and the isotacticity is more than 97%. The particle size of the magnesium oxide nano particles is 30~50 nm. The polyolefin elastomer is an ethylene-octylene copolymer in which octylene is 2 0 ~30% in content and 0.85~0.88 g/cm 3 in density. The antioxidant is the antioxidant 1010, the antioxidant 2246 or the antioxidant 264. The fire retardant is magnesium hydroxide, low-water zinc borate, aluminum hydroxide or antimonous oxide. The processing aid is lubricating agent glyceryl stearate.
[0039] The technical solution will be described in detail through the following examples, but is not limited to the following examples.
[0040] The examples of the method of the disclosure will be described below.
[0041] Example 1:
[0042] (1) adding 5 g of magnesium oxide nano particles and 10 g of y-aminopropyltriethoxy silane into 200 g of toluene solution, then heating to 120°C
under oil bath, reacting for 12 h under the condition of stirring, and condensing and refluxing to obtain a suspension;
[0043] (2) putting the above suspension into a centrifugal machine to be centrifuged for 6 min at a rotation speed of 6000 r/min to obtain a precipitate, and drying the precipitate for 24 h in a vacuum drying oven at 80 °C to obtain
magnesium oxide particles subjected to surface treatment;
[0044] (3) mutually mixing 40 g of isotactic polypropylene, 10 g of polyolefin elastomer POE, 1.5 g of magnesium oxide nano particles subjected to surface treatment and having a diameter of 40 nanometers, 0.25 g of antioxidant 1010, 1 g of fire retardant magnesium hydroxide and 0.25 g of processing aid glyceryl stearate to obtain a mixture; and
[0045] (4) carrying out melt blending on the above mixture in an internal mixer for min at 200°C at a rotation speed of 60r/min to obtain a recyclable thermoplastic high-voltage direct-current cable nano composite insulating material. The space charge performance of the recyclable thermoplastic high-voltage direct-current cable nano composite insulating material is seen in Fig. 1 (b).
[0046] The recyclable thermoplastic high-voltage direct-current cable nano composite insulating material obtained in the above example can normally work at 100°C, which indicates that the thermal property and the mechanical property of the
material can be greatly improved. Meanwhile, it can be seen from Fig. 1 (b) that this material has good space charge inhibition capability. From comprehensive property, this material meets various requirements on recyclable high-voltage direct-current cable insulation, does not need to be cross-linked in the process of preparation and is a recyclable thermoplastic material.
[0047] Example 2:
[0048] (1) adding 5 g of magnesium oxide nano particles and 10 g of y-aminopropyltriethoxy silane into 200 g of toluene solution, then heating to 120°C
under oil bath, reacting for 12 h under the condition of stirring, and condensing and refluxing to obtain a suspension;
[0049] (2) putting the above suspension into a centrifugal machine to be centrifuged for 6 min at a rotation speed of 6000 r/min to obtain a precipitate, and drying the precipitate for 24 h in a vacuum drying oven at 80 °C to obtain
magnesium oxide particles subjected to surface treatment;
[0050] (3) mutually mixing 30 g of isotactic polypropylene, 20 g of polyolefin elastomer POE, 0.5 g of magnesium oxide nano particles subjected to surface treatment and having a diameter of 30 nanometers, 0.25 g of antioxidant 2246, 2 g of fire retardant low-water zinc borate and 0.25 g of processing aid glyceryl stearate to obtain a mixture; and
[0051] (4) carrying out melt blending on the above mixture in an internal mixer for min at 190°C at a rotation speed of 40 r/min to obtain a recyclable thermoplastic
high-voltage direct-current cable nano composite insulating material.
[0052] Example 3:
[0053] (1) adding 5 g of magnesium oxide nano particles and 10 g of y-aminopropyltriethoxy silane into 200 g of toluene solution, then heating to 120°C under oil bath, reacting for 12 h under the condition of stirring, and condensing and refluxing to obtain a suspension;
[0054] (2) putting the above suspension into a centrifugal machine to be centrifuged for 6 min at a rotation speed of 6000 r/min to obtain a precipitate, and drying the precipitate for 24 h in a vacuum drying oven at 80 °C to obtain magnesium oxide particles subjected to surface treatment;
[0055] (3) mutually mixing 30 g of isotactic polypropylene, 10 g of polyolefin elastomer POE, 1 g of magnesium oxide nano particles subjected to surface treatment and having a diameter of 50 nanometers, 0.5 g of antioxidant 110, 2.5 g of fire retardant aluminum hydroxide and 0.5 g of processing aid glyceryl stearate to obtain a mixture; and
[0056] (4) carrying out melt blending on the above mixture in an internal mixer for 12 min at 200°C at a rotation speed of 50 r/min to obtain a recyclable thermoplastic high-voltage direct-current cable nano composite insulating material.
[0057] Example 4:
[0058] (1) adding 5 g of magnesium oxide nano particles and 10 g of y-aminopropyltriethoxy silane into 200 g of toluene solution, then heating to 120°C under oil bath, reacting for 12 h under the condition of stirring, and condensing and refluxing to obtain a suspension;
[0059] (2) putting the above suspension into a centrifugal machine to be centrifuged for 6 min at a rotation speed of 6000 r/min to obtain a precipitate, and drying the precipitate for 24 h in a vacuum drying oven at 80 °C to obtain magnesium oxide particles subjected to surface treatment;
[0060] (3) mutually mixing 40 g of isotactic polypropylene, 20 g of polyolefin elastomer POE, 1 g of magnesium oxide nano particles subjected to surface treatment and having a diameter of 45 nanometers, 0.25 g of antioxidant 110, 1.5 g of fire retardant antimonous oxide and 0.25 g of processing aid glyceryl stearate to obtain a mixture; and
[0061] (4) carrying out melt blending on the above mixture in an internal mixer for min at 200°C at a rotation speed of 60 r/min to obtain a recyclable thermoplastic high-voltage direct-current cable nano composite insulating material.
[0062] The samples in the above examples are prepared by adopting a mould pressing method. Firstly, the samples are preheated for 7 min, and then subjected to hot pressing for 10 min at 200 °C and 20MPa, so as to press a film with a thickness of 300 um for space charge measurement.
[0063] The recyclable thermoplastic high-voltage direct-current cable nano composite insulating material is obtained in example 1. Wherein, Fig.1 (a) is the space charge distribution diagram of pure polypropylene, and Fig.1 (b) is the space charge distribution diagram of the recyclable thermoplastic high-voltage direct-current cable nano composite insulating material. In Fig.1, the abscissa is the thickness of the film pressed by the cable material, and the ordinate is the space charge density at this position in the film.
Claims (7)
1. A preparation method of a recyclable thermoplastic high-voltage direct-current cable nano composite insulating material, the method comprising the following steps:
(1) adding 2.5 parts of magnesium oxide nano particles and 5 parts of y-aminopropyltriethoxy silane into 100 parts of toluene solution, then heating to 120 °C under oil bath, reacting for 12 h under the condition of stirring, and
condensing and refluxing to obtain a suspension;
(2) putting the suspension into a centrifugal machine to be centrifuged for 6 min at a rotation speed of 6000 r/min to obtain a precipitate, and drying the precipitate for 24 h in a vacuum drying oven at 80°C to obtain magnesium oxide
particles subjected to surface treatment;
(3) mutually mixing isotactic polypropylene, a polyolefin elastomer, magnesium oxide nano particles subjected to surface treatment obtained in step (2), an antioxidant, a fire retardant and a processing aid to obtain a mixture, wherein the mixture comprises the following various components in parts by mass:
isotactic polypropylene 60~80 parts
polyolefin elastomer 20~40 parts
magnesium oxide nano particles subjected to surface treatment 1~3 parts
antioxidant 0.5~1 part
fire retardant 2~5 parts
processing aid 0.5~1 part
(4) carrying out melt blending on the above mixture in an internal mixer for ~15 min at 180 °C ~200 °C at a rotation speed of 40~60 r/min to obtain the
recyclable thermoplastic high-voltage direct-current cable nano composite insulating material.
2. The preparation method according to claim 1, wherein the density of isotactic polypropylene is 0.90~0.94 g/cm 3, the melt flow rate of isotactic polypropylene is 1.7-3.1 g/10min, and the isotacticity is larger than 97%.
3. The preparation method according to claim 1, wherein the particle size of the magnesium oxide nano particles subjected to surface treatment is 30~50 nm.
4. The preparation method according to claim 1, wherein the polyolefin elastomer is an ethylene-octylene copolymer in which octylene is 20 ~30% in content and 0.85~0.88 g/cm3 in density.
5. The preparation method according to claim 1, wherein the antioxidant is an antioxidant 1010, an antioxidant 2246 or an antioxidant 264.
6. The preparation method according to claim 1, wherein the fire retardant is magnesium hydroxide, low-water zinc borate, aluminum hydroxide or antimonous oxide.
7. The preparation method according to claim 1, wherein the processing aid is lubricating agent glyceryl stearate.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876786A (en) * | 2021-01-21 | 2021-06-01 | 广西嘉意发科技有限公司 | PVC material for cable shell and preparation method thereof |
| CN113004613A (en) * | 2021-03-08 | 2021-06-22 | 天津大学 | Preparation method of high partial discharge tolerance polypropylene insulating material based on elastomer |
| CN113999454A (en) * | 2021-11-09 | 2022-02-01 | 清华大学 | High-toughness polypropylene composite material capable of inhibiting space charge and preparation method thereof |
-
2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876786A (en) * | 2021-01-21 | 2021-06-01 | 广西嘉意发科技有限公司 | PVC material for cable shell and preparation method thereof |
| CN113004613A (en) * | 2021-03-08 | 2021-06-22 | 天津大学 | Preparation method of high partial discharge tolerance polypropylene insulating material based on elastomer |
| CN113999454A (en) * | 2021-11-09 | 2022-02-01 | 清华大学 | High-toughness polypropylene composite material capable of inhibiting space charge and preparation method thereof |
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