CN111154171A - Aging-resistant and cracking-resistant sheath material for mineral insulated cable and preparation method thereof - Google Patents
Aging-resistant and cracking-resistant sheath material for mineral insulated cable and preparation method thereof Download PDFInfo
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- CN111154171A CN111154171A CN201911415321.7A CN201911415321A CN111154171A CN 111154171 A CN111154171 A CN 111154171A CN 201911415321 A CN201911415321 A CN 201911415321A CN 111154171 A CN111154171 A CN 111154171A
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- coupling agent
- magnesium hydroxide
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- 239000000463 material Substances 0.000 title claims abstract description 42
- 230000032683 aging Effects 0.000 title claims abstract description 27
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 26
- 239000011707 mineral Substances 0.000 title claims abstract description 26
- 238000005336 cracking Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title abstract description 23
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical class [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 57
- 239000010445 mica Substances 0.000 claims abstract description 43
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 43
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical class [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000000843 powder Substances 0.000 claims abstract description 39
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 20
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 20
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 18
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 15
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 15
- 229920001577 copolymer Polymers 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000314 lubricant Substances 0.000 claims abstract description 7
- 239000000347 magnesium hydroxide Substances 0.000 claims description 28
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 28
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 26
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 18
- 239000007822 coupling agent Substances 0.000 claims description 18
- -1 alkyl quaternary ammonium salt Chemical class 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 12
- 230000004048 modification Effects 0.000 claims description 11
- 238000012986 modification Methods 0.000 claims description 11
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 8
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims description 8
- 229920000573 polyethylene Polymers 0.000 claims description 8
- TXQVDVNAKHFQPP-UHFFFAOYSA-N [3-hydroxy-2,2-bis(hydroxymethyl)propyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CO)(CO)CO TXQVDVNAKHFQPP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 6
- 230000003179 granulation Effects 0.000 claims description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 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 5
- 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 5
- 235000019359 magnesium stearate Nutrition 0.000 claims description 4
- 238000009830 intercalation Methods 0.000 claims description 3
- 230000002687 intercalation Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- CXRFDZFCGOPDTD-UHFFFAOYSA-M Cetrimide Chemical compound [Br-].CCCCCCCCCCCCCC[N+](C)(C)C CXRFDZFCGOPDTD-UHFFFAOYSA-M 0.000 claims description 2
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims description 2
- WYRGOSDNPFGZFG-UHFFFAOYSA-K [bis(2-ethylhexoxy)-oxidophosphaniumyl] dihydrogen phosphate [bis(2-ethylhexoxy)-oxidophosphaniumyl] hydrogen phosphate [bis(2-ethylhexoxy)-oxidophosphaniumyl] phosphate propan-2-olate titanium(4+) Chemical compound [Ti+4].CC(C)[O-].CCCCC(CC)CO[P+]([O-])(OCC(CC)CCCC)OP(O)(O)=O.CCCCC(CC)CO[P+]([O-])(OCC(CC)CCCC)OP(O)([O-])=O.CCCCC(CC)CO[P+]([O-])(OCC(CC)CCCC)OP([O-])([O-])=O WYRGOSDNPFGZFG-UHFFFAOYSA-K 0.000 claims description 2
- XJWSAJYUBXQQDR-UHFFFAOYSA-M dodecyltrimethylammonium bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)C XJWSAJYUBXQQDR-UHFFFAOYSA-M 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000003712 anti-aging effect Effects 0.000 abstract description 3
- 230000004224 protection Effects 0.000 abstract description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003063 flame retardant Substances 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- 238000001035 drying Methods 0.000 description 17
- 238000001914 filtration Methods 0.000 description 13
- 239000002002 slurry Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 239000000725 suspension Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000006750 UV protection Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000003014 reinforcing 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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
-
- 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
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- 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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- 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
Abstract
The invention discloses an anti-aging and anti-cracking sheath material for a mineral insulated cable and a preparation method thereof, wherein the sheath material comprises the following raw materials in parts by weight: 40-60 parts of EVA resin, 10-20 parts of high-density polyethylene, 2-4 parts of maleic anhydride grafted high-density polyethylene, 1-2 parts of maleic anhydride grafted ethylene-1-octene copolymer, 40-60 parts of modified magnesium hydroxide, 10-20 parts of modified mica powder, 5-10 parts of modified potassium titanate whisker, 1-2 parts of weather-resistant agent, 1-1.5 parts of antioxidant and 1-2 parts of lubricant. The sheath material for the mineral insulated cable, which is prepared by the invention, has excellent insulating property, aging resistance, cracking resistance and mechanical strength, has good flame-retardant and smoke-inhibiting effects, has high use safety and can play a very good protection role on the mineral insulated cable.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to an anti-aging and anti-cracking sheath material for a mineral insulated cable and a preparation method thereof.
Background
The mineral insulated cable is composed of a copper core, a mineral insulated material, a copper metal sheath and the like, has good conductivity, mechanical and physical properties, fire resistance and incombustibility, can ensure fire protection and power supply during the duration of a fire under the condition of the fire, and is mainly used in high-rise buildings, special places and equipment. In order to protect the cable against corrosion and prolong the service life of the mineral insulated cable, it is usually necessary to use a material having an outer sheath on the outside thereof. At present, the outer sheath material for the mineral insulated cable is usually polyolefin, has certain limitations in insulation performance and mechanical performance, and is easy to age and crack, so that the protection effect on the mineral insulated cable is weakened.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an aging-resistant and cracking-resistant sheath material for a mineral insulated cable and a preparation method thereof.
The invention provides an aging-resistant and cracking-resistant sheath material for a mineral insulated cable, which comprises the following raw materials in parts by weight:
40-60 parts of EVA resin, 10-20 parts of high-density polyethylene, 2-4 parts of maleic anhydride grafted high-density polyethylene, 1-2 parts of maleic anhydride grafted ethylene-1-octene copolymer, 40-60 parts of modified magnesium hydroxide, 10-20 parts of modified mica powder, 5-10 parts of modified potassium titanate whisker, 1-2 parts of weather-resistant agent, 1-1.5 parts of antioxidant and 1-2 parts of lubricant.
Preferably, the modified magnesium hydroxide is prepared by surface modification of magnesium hydroxide by a silane coupling agent; the weight ratio of the silane coupling agent to the magnesium hydroxide is (0.5-1): 100, respectively; the silane coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH 570; the mesh number of the magnesium hydroxide is more than or equal to 5000 meshes.
Preferably, the preparation method of the modified magnesium hydroxide comprises the following steps: adding magnesium hydroxide into water, dispersing uniformly to prepare magnesium hydroxide slurry with the mass concentration of 5-10%, then adding a silane coupling agent, stirring for 1-2h at 40-60 ℃, filtering, and drying at 110 ℃ to obtain the magnesium hydroxide.
Preferably, the modified mica powder is prepared by intercalation modification of mica powder by alkyl quaternary ammonium salt; the weight ratio of the alkyl quaternary ammonium salt to the mica powder is (1-1.5): 100, respectively; the alkyl quaternary ammonium salt is at least one of dodecyl trimethyl ammonium bromide, tetradecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide and hexadecyl trimethyl ammonium bromide; the mesh number of the mica powder is more than or equal to 2000 meshes.
Preferably, the preparation method of the modified mica powder comprises the following steps: adding mica powder into water, dispersing uniformly to prepare mica slurry with the mass concentration of 1-3%, then adding alkyl quaternary ammonium salt, reacting for 3-5h at 80-90 ℃, filtering, washing, drying, dispersing uniformly in absolute ethyl alcohol, carrying out ultrasonic treatment for 30-60min under the condition of 800-1000W, and drying to obtain the mica powder.
Preferably, the modified potassium titanate whisker is prepared by carrying out surface modification on potassium titanate whisker by a titanate coupling agent; the weight ratio of the titanate coupling agent to the potassium titanate whisker is (1-2): 100, respectively; the titanate coupling agent is at least one of titanate coupling agent NDZ-101 and titanate coupling agent NDZ-201; the potassium titanate whisker has a diameter of 0.8-1.2 μm and a length of 30-50 μm.
Preferably, the preparation method of the modified potassium titanate whisker comprises the following steps: uniformly dispersing potassium titanate whiskers in absolute ethyl alcohol to prepare a potassium titanate whisker suspension with the mass concentration of 20-30%, then adding a titanate coupling agent, heating and stirring at 60-80 ℃ for 1-2h, filtering, and drying at 100-110 ℃ to obtain the potassium titanate whisker suspension.
Preferably, the weather resistant agent is at least one of UV944, UV531 and UV 770.
Preferably, the antioxidant is at least one of antioxidant 1010, antioxidant DLTP and antioxidant 168.
Preferably, the lubricant is at least one of polyethylene wax, pentaerythritol stearate and magnesium stearate.
The preparation method of the aging-resistant and cracking-resistant sheath material for the mineral insulated cable comprises the following steps:
s1, weighing the raw materials according to the weight, and uniformly mixing EVA resin, high-density polyethylene, maleic anhydride grafted ethylene-1-octene copolymer, modified magnesium hydroxide, modified mica powder, modified potassium titanate whisker, a weather-resistant agent, an antioxidant and a lubricant at a high speed to obtain a mixture;
and S2, carrying out melt extrusion granulation on the mixture by using a double-screw extruder to obtain the material.
Preferably, in the step S1, the rotation speed of the high-speed mixing is 2000-2500r/min, and the mixing time is 15-20 min.
Preferably, in the step S2, the barrel temperature of the twin-screw extruder is 180-220 ℃, and the screw rotation speed is 90-110 r/min.
The invention has the following beneficial effects:
according to the invention, a filling system is formed by compounding modified magnesium hydroxide, modified mica powder and modified potassium titanate whiskers, wherein the magnesium hydroxide is modified by adopting a silane coupling agent, so that the compatibility of the magnesium hydroxide and resin is improved; the mica powder adopts a method of alkyl quaternary ammonium salt intercalation modification and ultrasonic treatment, so that the mica powder layers are stripped to form organic modified flaky micro-nano level mica powder, the compatibility with resin can be improved, the insulating property, the heat aging resistance and the ultraviolet aging resistance of the resin can be greatly improved, and the weather resistance of the material can be improved; the potassium titanate whisker is modified by titanate coupling agent, so that the compatibility with resin and the dispersion uniformity of the whisker in the resin are improved, and the mechanical property of the material is greatly improved. By compounding the granular magnesium hydroxide, the flaky mica powder and the fibrous potassium titanate whisker, the composite material has good reinforcing effect and barrier effect, can improve the mechanical property of the material, and can greatly improve the ultraviolet resistance stability and the heat resistance stability of the material, thereby greatly improving the aging resistance of the material, so that the prepared sheath material for the mineral insulated cable has excellent insulating property, aging resistance, cracking resistance and mechanical strength, has good flame-retardant and smoke-suppression effects, has high use safety, and can play a very good role in protecting the mineral insulated cable.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
An aging-resistant and cracking-resistant sheath material for a mineral insulated cable comprises the following raw materials in parts by weight:
40 parts of EVA resin, 10 parts of high-density polyethylene, 2 parts of maleic anhydride grafted high-density polyethylene, 1 part of maleic anhydride grafted ethylene-1-octene copolymer, 40 parts of modified magnesium hydroxide, 10 parts of modified mica powder, 5 parts of modified potassium titanate whiskers, UV 9441 parts of weather-resistant agent, 10101 parts of antioxidant and 1 part of polyethylene wax.
The preparation method of the modified magnesium hydroxide comprises the following steps: adding 5000-mesh magnesium hydroxide into water, uniformly dispersing to prepare magnesium hydroxide slurry with the mass concentration of 5%, then adding a silane coupling agent KH550, stirring for 1h at 40 ℃, filtering, and drying at 100 ℃ to obtain modified magnesium hydroxide, wherein the modified magnesium hydroxide is prepared by performing surface modification on magnesium hydroxide by using the silane coupling agent, and the weight ratio of the silane coupling agent KH550 to the magnesium hydroxide is 0.5: 100.
the preparation method of the modified mica powder comprises the following steps: adding 2000-mesh mica powder into water, uniformly dispersing to prepare mica slurry with the mass concentration of 1%, then adding cetyl trimethyl ammonium bromide, reacting for 3 hours at 80 ℃, filtering, washing, drying, uniformly dispersing in absolute ethyl alcohol, carrying out ultrasonic treatment for 30 minutes under the condition of 800W, and drying to obtain the mica powder, wherein the weight ratio of the cetyl trimethyl ammonium bromide to the mica powder is 1: 100.
the preparation method of the modified potassium titanate whisker comprises the following steps: uniformly dispersing potassium titanate whiskers with the diameter of 0.8-1.2 microns and the length of 30-50 microns in absolute ethyl alcohol to prepare a potassium titanate whisker suspension with the mass concentration of 20%, then adding a titanate coupling agent NDZ-101, heating and stirring for 1h at 60 ℃, filtering, and drying at 100 ℃ to obtain the potassium titanate whisker-based composite material, wherein the weight ratio of the titanate coupling agent NDZ-101 to the potassium titanate whiskers is 1: 100.
the preparation method of the aging-resistant and cracking-resistant sheath material for the mineral insulated cable comprises the following steps:
s1, weighing raw materials according to weight, and mixing EVA resin, high-density polyethylene, maleic anhydride grafted ethylene-1-octene copolymer, modified magnesium hydroxide, modified mica powder, modified potassium titanate whisker, weather resistant agent UV944, antioxidant 1010 and polyethylene wax at a high speed for 15min under the condition of 2000r/min to obtain a mixture;
s2, carrying out melt extrusion granulation on the mixture by using a double-screw extruder, and obtaining the material, wherein the barrel temperature of the double-screw extruder is 180-220 ℃, and the screw rotating speed is 90 r/min.
Example 2
An aging-resistant and cracking-resistant sheath material for a mineral insulated cable comprises the following raw materials in parts by weight:
EVA resin 60, high-density polyethylene 20, maleic anhydride grafted high-density polyethylene 4, maleic anhydride grafted ethylene-1-octene copolymer 2, modified magnesium hydroxide 60, modified mica powder 20, modified potassium titanate whisker 10, weather resistant agent UV 7702, antioxidant 1681.5 and magnesium stearate 2.
The preparation method of the modified magnesium hydroxide comprises the following steps: adding 5000-mesh magnesium hydroxide into water, uniformly dispersing to prepare magnesium hydroxide slurry with the mass concentration of 10%, then adding a silane coupling agent KH550, stirring for 2 hours at 60 ℃, filtering, and drying at 110 ℃ to obtain modified magnesium hydroxide, wherein the modified magnesium hydroxide is prepared by performing surface modification on magnesium hydroxide by using the silane coupling agent, and the weight ratio of the silane coupling agent KH550 to the magnesium hydroxide is 1: 100.
the preparation method of the modified mica powder comprises the following steps: adding 2000-mesh mica powder into water, uniformly dispersing to prepare mica slurry with the mass concentration of 3%, then adding cetyl trimethyl ammonium bromide, reacting for 5 hours at 90 ℃, filtering, washing, drying, uniformly dispersing in absolute ethyl alcohol, carrying out ultrasonic treatment for 60 minutes under the condition of 1000W, and drying to obtain the mica powder, wherein the weight ratio of the cetyl trimethyl ammonium bromide to the mica powder is 1.5: 100.
the preparation method of the modified potassium titanate whisker comprises the following steps: uniformly dispersing potassium titanate whiskers with the diameter of 0.8-1.2 microns and the length of 30-50 microns in absolute ethyl alcohol to prepare a potassium titanate whisker suspension with the mass concentration of 30%, then adding a titanate coupling agent NDZ-101, heating and stirring at 60-80 ℃ for 2 hours, filtering, and drying at 110 ℃ to obtain the potassium titanate whisker-based composite material, wherein the weight ratio of the titanate coupling agent NDZ-101 to the potassium titanate whiskers is 2: 100.
the preparation method of the aging-resistant and cracking-resistant sheath material for the mineral insulated cable comprises the following steps:
s1, weighing the raw materials according to the weight, and mixing the EVA resin, the high-density polyethylene, the maleic anhydride grafted ethylene-1-octene copolymer, the modified magnesium hydroxide, the modified mica powder, the modified potassium titanate whisker, the weather resisting agent UV770, the antioxidant 168 and the magnesium stearate at a high speed for 20min under the condition of 2500r/min to obtain a mixture;
s2, carrying out melt extrusion granulation on the mixture by using a double-screw extruder, and obtaining the material, wherein the barrel temperature of the double-screw extruder is 180-220 ℃, and the screw rotating speed is 110 r/min.
Example 3
An aging-resistant and cracking-resistant sheath material for a mineral insulated cable comprises the following raw materials in parts by weight:
50 parts of EVA resin, 15 parts of high-density polyethylene, 3 parts of maleic anhydride grafted high-density polyethylene, 1.5 parts of maleic anhydride grafted ethylene-1-octene copolymer, 50 parts of modified magnesium hydroxide, 15 parts of modified mica powder, 8 parts of modified potassium titanate whisker, UV 5311 parts of weather-resistant agent, UV7700.5 parts of weather-resistant agent, 10100.6 parts of antioxidant, 1680.6 parts of antioxidant, 1 part of polyethylene wax and 0.5 part of pentaerythritol stearate.
The preparation method of the modified magnesium hydroxide comprises the following steps: adding 5000-mesh magnesium hydroxide into water, uniformly dispersing to prepare magnesium hydroxide slurry with the mass concentration of 8%, then adding a silane coupling agent KH550, stirring for 1.5h at 50 ℃, filtering, and drying at 105 ℃ to obtain modified magnesium hydroxide, wherein the modified magnesium hydroxide is prepared by performing surface modification on magnesium hydroxide by using the silane coupling agent, and the weight ratio of the silane coupling agent KH550 to the magnesium hydroxide is 0.8: 100.
the preparation method of the modified mica powder comprises the following steps: adding 2000-mesh mica powder into water, uniformly dispersing to prepare mica slurry with the mass concentration of 2%, then adding cetyl trimethyl ammonium bromide, reacting for 4 hours at 85 ℃, filtering, washing, drying, uniformly dispersing in absolute ethyl alcohol, carrying out ultrasonic treatment for 50 minutes under the condition of 900W, and drying to obtain the mica powder, wherein the weight ratio of the cetyl trimethyl ammonium bromide to the mica powder is 1.2: 100.
the preparation method of the modified potassium titanate whisker comprises the following steps: uniformly dispersing potassium titanate whiskers with the diameter of 0.8-1.2 microns and the length of 30-50 microns in absolute ethyl alcohol to prepare a potassium titanate whisker suspension with the mass concentration of 25%, then adding a titanate coupling agent NDZ-101, heating and stirring at 75 ℃ for 1.5 hours, filtering, and drying at 105 ℃ to obtain the potassium titanate whisker-based composite material, wherein the weight ratio of the titanate coupling agent NDZ-101 to the potassium titanate whiskers is 1.5: 100.
the preparation method of the aging-resistant and cracking-resistant sheath material for the mineral insulated cable comprises the following steps:
s1, weighing raw materials according to the weight, and mixing EVA resin, high-density polyethylene, maleic anhydride grafted ethylene-1-octene copolymer, modified magnesium hydroxide, modified mica powder, modified potassium titanate whisker, weather resistant agent UV531, weather resistant agent UV770, antioxidant 1010, antioxidant 168, polyethylene wax and pentaerythritol stearate at a high speed for 18min under the condition of 2200r/min to obtain a mixture;
s2, carrying out melt extrusion granulation on the mixture by using a double-screw extruder, and obtaining the material, wherein the barrel temperature of the double-screw extruder is 180-220 ℃, and the screw rotating speed is 100 r/min.
Comparative example 1
An aging-resistant and cracking-resistant sheath material for a mineral insulated cable comprises the following raw materials in parts by weight:
50 parts of EVA resin, 15 parts of high-density polyethylene, 3 parts of maleic anhydride grafted high-density polyethylene, 1.5 parts of maleic anhydride grafted ethylene-1-octene copolymer, 73 parts of modified magnesium hydroxide, 5311 parts of weather resistant agent, 7700.5 parts of weather resistant agent, 10100.6 parts of antioxidant, 1680.6 parts of antioxidant, 1 part of polyethylene wax and 0.5 part of pentaerythritol stearate.
The preparation method of the modified magnesium hydroxide comprises the following steps: adding 5000-mesh magnesium hydroxide into water, uniformly dispersing to prepare magnesium hydroxide slurry with the mass concentration of 8%, then adding a silane coupling agent KH550, stirring for 1.5h at 50 ℃, filtering, and drying at 105 ℃ to obtain modified magnesium hydroxide, wherein the modified magnesium hydroxide is prepared by performing surface modification on magnesium hydroxide by using the silane coupling agent, and the weight ratio of the silane coupling agent KH550 to the magnesium hydroxide is 0.8: 100.
the preparation method of the aging-resistant and cracking-resistant sheath material for the mineral insulated cable comprises the following steps:
s1, weighing the raw materials according to the weight, and mixing the EVA resin, the high-density polyethylene, the maleic anhydride grafted ethylene-1-octene copolymer, the modified magnesium hydroxide, the weather resisting agent UV531, the weather resisting agent UV770, the antioxidant 1010, the antioxidant 168, the polyethylene wax and the pentaerythritol stearate at a high speed for 18min under the condition of 2200r/min to obtain a mixture;
s2, carrying out melt extrusion granulation on the mixture by using a double-screw extruder, and obtaining the material, wherein the barrel temperature of the double-screw extruder is 180-220 ℃, and the screw rotating speed is 100 r/min.
Test examples
The cable sheath materials obtained in example 3 and comparative example 1 were subjected to a performance test in which the tensile strength and elongation at break were in accordance with GBT 1040.1-2006; the anti-aging test is to test the change rate of the tensile strength and the elongation at break by adopting air heat aging conditions (135 ℃, 10d) after the heat aging is finished; the test conditions of high temperature cracking resistance are 130 ℃, 5kg and 1 h; the oxygen index is according to GBT 2046.2-2009 standard; the test results are shown in table 1:
table 1 cable sheath material performance test results
| Test items | Example 3 | Comparative example 1 |
| Tensile strength (MPa) | 14.5 | 10.7 |
| Elongation at Break (%) | 310 | 270 |
| Tensile Strength Change Rate (%) | 9.0 | 12.1 |
| Elongation at Break Change (%) | -13 | -26 |
| High temperature cracking resistance | Cracking of | Is not cracked |
| Oxygen Index (OI) | 35 | 32 |
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The aging-resistant and cracking-resistant sheath material for the mineral insulated cable is characterized by comprising the following raw materials in parts by weight:
40-60 parts of EVA resin, 10-20 parts of high-density polyethylene, 2-4 parts of maleic anhydride grafted high-density polyethylene, 1-2 parts of maleic anhydride grafted ethylene-1-octene copolymer, 40-60 parts of modified magnesium hydroxide, 10-20 parts of modified mica powder, 5-10 parts of modified potassium titanate whisker, 1-2 parts of weather-resistant agent, 1-1.5 parts of antioxidant and 1-2 parts of lubricant.
2. The aging-resistant and cracking-resistant sheath material for mineral-insulated cables as claimed in claim 1, wherein the modified magnesium hydroxide is prepared by surface modification of magnesium hydroxide with a silane coupling agent; the weight ratio of the silane coupling agent to the magnesium hydroxide is (0.5-1): 100, respectively; the silane coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH 570; the mesh number of the magnesium hydroxide is more than or equal to 5000 meshes.
3. The aging-resistant and cracking-resistant sheath material for the mineral insulated cable according to claim 1 or 2, wherein the modified mica powder is prepared by performing intercalation modification on mica powder by alkyl quaternary ammonium salt and performing ultrasonic treatment; the weight ratio of the alkyl quaternary ammonium salt to the mica powder is (1-1.5): 100, respectively; the alkyl quaternary ammonium salt is at least one of dodecyl trimethyl ammonium bromide, tetradecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide and hexadecyl trimethyl ammonium bromide; the mesh number of the mica powder is more than or equal to 2000 meshes.
4. The aging-resistant and crack-resistant sheath material for mineral-insulated cables according to any one of claims 1 to 3, wherein the modified potassium titanate whiskers are prepared by surface modification of potassium titanate whiskers by a titanate coupling agent; the weight ratio of the titanate coupling agent to the potassium titanate whisker is (1-2): 100, respectively; the titanate coupling agent is at least one of titanate coupling agent NDZ-101 and titanate coupling agent NDZ-201; the potassium titanate whisker has a diameter of 0.8-1.2 μm and a length of 30-50 μm.
5. The weather-resistant, crack-resistant sheathing compound for mineral-insulated cables according to any one of claims 1 to 4, wherein the weather-resistant agent is at least one of UV944, UV531, UV 770.
6. The aging-resistant and crack-resistant sheath material for mineral-insulated cables as claimed in any one of claims 1 to 5, wherein the antioxidant is at least one of antioxidant 1010, antioxidant DLTP, antioxidant 168.
7. The weather-resistant, crack-resistant sheath material for mineral-insulated cables as claimed in any one of claims 1 to 6, wherein the lubricant is at least one of polyethylene wax, pentaerythritol stearate, magnesium stearate.
8. A process for preparing an ageing-resistant and crack-resistant sheath material for mineral-insulated cables according to any one of claims 1 to 7, characterized in that it comprises the following steps:
s1, weighing the raw materials according to the weight, and uniformly mixing EVA resin, high-density polyethylene, maleic anhydride grafted ethylene-1-octene copolymer, modified magnesium hydroxide, modified mica powder, modified potassium titanate whisker, a weather-resistant agent, an antioxidant and a lubricant at a high speed to obtain a mixture;
and S2, carrying out melt extrusion granulation on the mixture by using a double-screw extruder to obtain the material.
9. The method as claimed in claim 8, wherein the step S1, the high speed mixing is performed at a speed of 2000-2500r/min for a time of 15-20 min.
10. The method for preparing an aging-resistant and crack-resistant sheath material for mineral-insulated cables as claimed in claim 8 or 9, wherein in step S2, the barrel temperature of the twin-screw extruder is 180-220 ℃, and the screw rotation speed is 90-110 r/min.
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Application publication date: 20200515 |