CN115910456A - High-temperature-resistant fireproof cable and preparation method thereof - Google Patents
High-temperature-resistant fireproof cable and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- -1 polyethylene Polymers 0.000 claims abstract description 114
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 102
- 239000011707 mineral Substances 0.000 claims abstract description 100
- 239000004698 Polyethylene Substances 0.000 claims abstract description 97
- 229920000573 polyethylene Polymers 0.000 claims abstract description 97
- 239000000779 smoke Substances 0.000 claims abstract description 73
- 238000002955 isolation Methods 0.000 claims abstract description 40
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 38
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 37
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 37
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 37
- 238000011049 filling Methods 0.000 claims abstract description 34
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 33
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 28
- 239000000853 adhesive Substances 0.000 claims abstract description 26
- 230000001070 adhesive effect Effects 0.000 claims abstract description 26
- 239000004020 conductor Substances 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000010949 copper Substances 0.000 claims abstract description 16
- 229910052802 copper Inorganic materials 0.000 claims abstract description 16
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims description 44
- 239000010445 mica Substances 0.000 claims description 28
- 229910052618 mica group Inorganic materials 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 16
- 239000011521 glass Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- 239000004115 Sodium Silicate Substances 0.000 claims description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 14
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 11
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- LOAUVZALPPNFOQ-UHFFFAOYSA-N quinaldic acid Chemical compound C1=CC=CC2=NC(C(=O)O)=CC=C21 LOAUVZALPPNFOQ-UHFFFAOYSA-N 0.000 claims description 8
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 7
- WYYQVWLEPYFFLP-UHFFFAOYSA-K chromium(3+);triacetate Chemical compound [Cr+3].CC([O-])=O.CC([O-])=O.CC([O-])=O WYYQVWLEPYFFLP-UHFFFAOYSA-K 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
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- 238000005303 weighing Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- RJDOZRNNYVAULJ-UHFFFAOYSA-L [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] RJDOZRNNYVAULJ-UHFFFAOYSA-L 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 abstract description 16
- 238000007254 oxidation reaction Methods 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 description 37
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- 238000012360 testing method Methods 0.000 description 10
- 229910052736 halogen Inorganic materials 0.000 description 9
- 150000002367 halogens Chemical class 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 229910052628 phlogopite Inorganic materials 0.000 description 7
- 150000003254 radicals Chemical group 0.000 description 7
- 239000004743 Polypropylene Substances 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 125000002943 quinolinyl group Chemical group N1=C(C=CC2=CC=CC=C12)* 0.000 description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- 239000003063 flame retardant Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 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 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 2
- 229920006158 high molecular weight polymer Polymers 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- WPMYUUITDBHVQZ-UHFFFAOYSA-M 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=CC(CCC([O-])=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-M 0.000 description 1
- 206010000369 Accident Diseases 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
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- 239000012434 nucleophilic reagent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Insulated Conductors (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention discloses a high-temperature-resistant fireproof cable which comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; each cable core comprises an annealed stranded copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside; the mineral fireproof layer is made of magnesium hydroxide, calcium carbonate, talcum powder, argil and adhesive; the low-smoke halogen-free outer sheath is made of polyolefin resin, argil, talcum powder, silica sol, magnesium hydroxide and polyethylene wax; the invention also discloses a preparation method of the cable, which comprises the following steps: the outer surface of the conductor is sequentially coated with a mineral insulating layer and an insulating isolation layer to prepare a cable core, the outer surfaces of the plurality of cable cores are filled to form a filling layer, and finally, the outer surface of the filling layer is sequentially coated with a mineral fireproof layer and a low-smoke halogen-free outer sheath. The cable provided by the invention has the performances of high flame retardance, high flexibility, corrosion resistance, heat resistance, oxidation resistance, low smoke, fire resistance, impact resistance and the like.
Description
Technical Field
The invention belongs to the technical field of cables, and particularly relates to a high-temperature-resistant fireproof cable and a preparation method thereof.
Background
In recent years, fire accidents occur frequently at home and abroad, and the guarantee of smoothness of equipment circuits such as elevators, lighting systems, communication systems, signal control systems and the like within a certain time of fire occurrence has important significance for reducing casualties of people and property loss. When a fire disaster occurs, the line can bear the high temperature of 250-1000 ℃ for a long time, and the smoothness of the line is difficult to ensure by a common flame-retardant cable under the condition, so that the fire-retardant cable which is fire-resistant, flame-retardant, low-smoke and nontoxic is irreplaceable in reducing the loss caused by the fire disaster.
Patent with application number CN201710224987.9 provides a flexible mineral insulation fireproof cable, which comprises a cable core and a sheath layer coated on the outer side of the cable core, wherein the sheath layer is composed of polyethylene, ethylene vinyl acetate, polypropylene, a vulcanization system, vinyl-terminated polydimethylsiloxane, a composite filler, phenyl petroleum sulfonate, an antioxidant 1076, 2-thiobis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], thiodipropionate diester and other raw materials. However, polyethylene and polypropylene in the sheath layer mixture system have poor heat resistance, are easy to deform when the temperature exceeds 200 ℃, and cannot play a good protection role in the internal structure of the cable; the polyethylene has poor oxidation resistance, although the antioxidant 1076 is added into the sheath layer mixture system, the antioxidant 1076 has weak oxidation resistance, and is easy to decompose during melt extrusion at 230 ℃, so that the oxidation resistance of the polyethylene is further weakened; the compatibility between high molecular polymers in a sheath layer mixture system is poor, the physical performance of a blending system is relatively poor, sulfur dioxide is generated by high-temperature combustion of a sulfur-containing compound in the blending system, the environment is polluted, and the environment-friendly development requirement in a newly developed concept is not met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-temperature-resistant fireproof cable and a preparation method thereof, and the high-temperature-resistant fireproof cable has the performances of high flame retardance, high flexibility, corrosion resistance, heat resistance, oxidation resistance, low smoke, fire resistance, impact resistance and the like by improving materials of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath, can work for a long time at the ambient temperature of 250 ℃ and can work for a short time at the ambient temperature of 1340 ℃ in an emergency.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a high-temperature-resistant fireproof cable comprises a plurality of cable cores from inside to outside, a mineral fireproof layer and a low-smoke halogen-free outer sheath, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight:
100-130 parts of polyolefin resin, 20-25 parts of pottery clay, 25-30 parts of talcum powder, 8-10 parts of silica sol, 17-19 parts of magnesium hydroxide and 3-8 parts of polyethylene wax, wherein the preferable parts are 110 parts of polyolefin resin, 25 parts of pottery clay, 25 parts of talcum powder, 8 parts of silica sol, 18 parts of magnesium hydroxide and 5 parts of polyethylene wax;
the polyolefin resin is modified polyethylene, and the preparation method of the modified polyethylene comprises the following steps:
s1, polyethylene, glycidyl methacrylate, styrene and dicumyl peroxide (DCP) are uniformly mixed in advance, and are subjected to melt mixing grafting in a rheometer to obtain a grafted product, the grafted product is placed in xylene, heated to 95-110 ℃, stirred and refluxed for 1-2h, acetone is added, the mixture is continuously stirred for 40-50min, cooled to room temperature, filtered, filter residue is taken, and washing and drying are carried out to obtain an intermediate 1, wherein the mass ratio of the glycidyl methacrylate to the styrene to the polyethylene is 1.0-1.2;
s2, sequentially adding the intermediate 1 obtained in the step S1, xylene, chromium acetate and quinoline-2-carboxylic acid into a reactor, heating to 100-105 ℃, stirring for 4-5h, cooling to room temperature, filtering, taking filter residue, and drying to obtain modified polyethylene, wherein the mass ratio of the quinoline-2-carboxylic acid to the intermediate 1 is 1;
the synthetic route of the modified polyethylene is as follows:
in the above-mentioned embodiments, the heat resistance of the high molecular weight polymer is generally defined as a measure of how much properties can be maintained at room temperature under a high temperature environment. The general high molecular material changes some physical properties of the material at high temperature because of the increased molecular motion, and the most obvious is elasticity. The most common method for improving the heat resistance of polymer materials is to inhibit molecular motion. The following methods are generally available: 1. the macromolecule molecular model is erected into a three-dimensional structure to form a mesh, so that the molecular motion is inhibited; 2. adding aromatic rings and alicyclic structures which are difficult to move into a molecular structure; 3. polar groups are added to the polymer to inhibit molecular motion by virtue of binding forces such as hydroxyl chains.
The oxidation process of high molecular weight polymers is a chain reaction in the free radical form. The high molecular polymer antioxidant can capture active free radicals to generate inactive free radicals or decompose polymer hydroperoxide generated in the oxidation process to terminate chain reaction and delay the oxidation process of the polymer, so that the polymer can be processed smoothly and the service life is prolonged.
Polyolefin materials are an important general-purpose plastic, and are widely applied to industries such as daily necessities, packaging, automobiles and the like due to large yield, wide application range and low price. However, due to the non-polarity and crystallinity of the material, when the material is compounded with other materials, a compatilizer or a grafted polar group is required to be added to improve the blending effect of the material and other materials, so that the application range of the material is expanded. The polyethylene is chemically modified, and the application field of the polyethylene can be expanded by introducing the required polar group while keeping the original characteristics. Dicumyl peroxide is used as a free radical initiator, peroxide bonds of the dicumyl peroxide are broken by heating to generate primary free radicals, so that the free radical grafting reaction of polyethylene and glycidyl methacrylate is initiated, and meanwhile, a styrene monomer is added to promote grafting; the free radical grafting product structure contains epoxy group, and carboxyl group in quinoline-2-carboxylic acid may be used as nucleophilic reagent to produce ring opening reaction with epoxy group under the catalysis of chromium acetate to obtain modified polyethylene.
As a further improvement of the invention, the number of the cable cores is 4-6, and each cable core comprises an annealed stranded copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside; the mineral insulating layer is at least three layers of mica tapes, and the mica tapes are golden mica tapes or synthetic mica tapes; the insulation isolation layer is prepared from the following raw materials in parts by weight: 90-100 parts of polyethylene, 20-30 parts of glass powder, 20-30 parts of argil, 4-7 parts of sodium silicate and 3-5 parts of polyethylene wax, wherein the polyethylene is preferably 100 parts, the glass powder is 20 parts, the argil is 25 parts, the sodium silicate is 6 parts, and the polyethylene wax is preferably 4 parts.
As a further improvement of the invention, the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30-40 parts of magnesium hydroxide, 10-20 parts of calcium carbonate, 30-40 parts of talcum powder, 15-20 parts of pottery clay and 8-10 parts of adhesive; the adhesive is organic silicon resin or silica sol, and preferably comprises 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive.
Magnesium hydroxide, argil, talcum powder and silica sol are added into raw materials of the mineral fireproof layer and the low-smoke halogen-free outer sheath, so that the fireproof, impact-resistant and flame-retardant performances of the cable are remarkably improved, the binding force between the mineral fireproof layer and the low-smoke halogen-free outer sheath can be improved, the mineral fireproof layer and the low-smoke halogen-free outer sheath are combined more tightly, and the purpose of effectively protecting the internal structure of the cable is achieved.
The invention also provides a preparation method of the high-temperature-resistant fireproof cable, which comprises the following steps:
a1, mixing and granulating by using a low-smoke halogen-free outer sheath: weighing polyolefin resin, argil, talcum powder, silica sol, magnesium hydroxide and polyethylene wax according to the weight ratio, uniformly mixing, adding into a double-screw extruder, and extruding and granulating, wherein the rotating speed of a screw in the double-screw extruder is 120-150r/min, and the temperature of the whole area is 250-300 ℃;
a2, cabling: sequentially coating a mineral insulating layer and an insulating isolation layer on the outer surface of the annealed stranded copper conductor to obtain a cable core; filling the outer surfaces of the plurality of cable cores to form a filling layer; and finally, sequentially coating a mineral fireproof layer and a low-smoke halogen-free outer sheath on the outer surface of the filling layer to obtain the high-temperature-resistant fireproof cable.
The invention has the following beneficial effects: the invention discloses a high-temperature-resistant fireproof cable, wherein a low-smoke halogen-free outer sheath is made of polyolefin resin, argil, talcum powder, silica sol, magnesium hydroxide and polyethylene wax, wherein the polyolefin resin is modified polyethylene. The polyethylene structure is chemically modified, the original characteristics are maintained, meanwhile, polar groups are introduced, the modified polyethylene and other raw materials are synergistic, and the performances of high flame retardance, high flexibility, corrosion resistance, heat resistance, oxidation resistance, low smoke, fire resistance, impact resistance and the like of the fireproof cable are obviously improved. The hydroxyl and quinoline ring structures are introduced into the polyethylene structure, so that the intermolecular hydrogen bond action and the stability of the quinoline ring structure can be utilized to inhibit molecular motion and improve the heat resistance of the polyethylene polymer, and the polyethylene polymer and other raw materials have synergistic effect, so that the low-smoke halogen-free outer sheath can keep high flexibility, high elasticity, excellent mechanical property and insulativity at the environment temperature of 250 ℃; in addition, the quinoline ring structure can also improve the oxidation resistance of the polyethylene polymer, so that the low-smoke halogen-free outer sheath has excellent oxidation resistance. Under the condition of high temperature of more than 550 ℃, the modified polyethylene and inorganic mineral substances such as argil, talcum powder and the like can quickly form a compact and hard ceramic armor body, so that the internal structure of the cable can be effectively protected, and the conditions that a mineral fireproof layer cracks, falls off and the like are avoided, and further the flame retardance, the fire resistance and the impact resistance of the cable are influenced. The high-temperature-resistant fireproof cable provided by the invention has the performances of high flame retardance, high flexibility, corrosion resistance, heat resistance, oxidation resistance, low smoke, fire prevention, impact resistance and the like, and can work for a long time at the ambient temperature of 250 ℃ and can also work for a short time at the ambient temperature of 1340 ℃ in an emergency.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Polyethylene 6201XR was obtained from Jiajia plastics raw materials, inc., of Dongguan; polyethylene wax SX-110B is available from Henan Bai Yi Da trade Co., ltd; polypropylene FB51 is purchased from Shenzhen Si Ke New Material science and technology Co., ltd; ethylene vinyl acetate UE4055 was purchased from shanghai tiantai trading ltd; silica sol with the particle size of 5nm and the content of 30 percent is purchased from Youhou fire-resistant material Co., ltd, yuanyang county; argil with 325 meshes purchased from Yongshui mineral processing factories in Ling shou county; talcum powder with 200 meshes, glass powder with 325 meshes, all of which are available from Hubei Asahi building materials science and technology development Limited; glycidyl methacrylate CAS number 106-91-2; dicumyl peroxide (DCP) CAS number 80-43-3; quinoline-2-carboxylic acid CAS number 93-10-7; chromium acetate CAS No. 1066-30-4; all the raw materials in the following examples and comparative examples are common commercial products.
Example 1
A preparation method of modified polyethylene comprises the following steps:
s1, pre-mixing 33kg of polyethylene, 1kg of glycidyl methacrylate, 1kg of styrene and 0.05kg of dicumyl peroxide uniformly, carrying out melt mixing grafting in a rheometer to obtain a grafted product, wherein the grafting temperature is 180 ℃, the grafting time is 15min, the rotational speed of the rheometer is 32rpm, putting the grafted product into 350kg of xylene, heating to 105 ℃, stirring and refluxing for 2h, adding 200kg of acetone, continuously stirring for 40min, cooling to room temperature, filtering, taking filter residue, washing with acetone, and drying to obtain an intermediate 1;
s2, sequentially adding 28kg of the intermediate 1 obtained in the step S1, 220kg of dimethylbenzene, 0.07kg of chromium acetate and 0.8kg of quinoline-2-carboxylic acid into a reactor, heating to 102 ℃, stirring for 4 hours, cooling to room temperature, filtering, taking filter residues, and drying to obtain modified polyethylene;
the synthetic route of the modified polyethylene is as follows:
example 2
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the number of the cable cores is 4, each cable core comprises an annealing stranded copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside, wherein the mineral insulating layer is a mica tape material with no less than three layers, the mica tape material is a phlogopite tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is prepared from the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm thick insulating isolation layer; the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight: 110 parts of polyolefin resin, 25 parts of argil, 25 parts of talcum powder, 8 parts of silica sol, 18 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is the modified polyethylene prepared in the example 1, and the thickness of the low-smoke halogen-free outer sheath is 3mm; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
A preparation method of a high-temperature-resistant fireproof cable comprises the following steps:
a1, mixing and granulating an insulating isolation layer: weighing polyethylene, glass powder, argil, sodium silicate and polyethylene wax according to the weight ratio, uniformly mixing, adding into a double-screw extruder, and extruding and granulating, wherein the rotating speed of a screw in the double-screw extruder is 130r/min, and the temperature of the whole area is 140 ℃;
a2, mixing and granulating by using a low-smoke halogen-free outer sheath: weighing polyolefin resin, argil, talcum powder, silica sol, magnesium hydroxide and polyethylene wax according to the weight ratio, uniformly mixing, adding into a double-screw extruder, and extruding and granulating, wherein the rotating speed of a screw in the double-screw extruder is 130r/min, and the temperature of the whole area is 300 ℃;
a3, cabling: sequentially coating a mineral insulating layer and an insulating isolation layer on the outer surface of the annealed stranded copper conductor to obtain a cable core; filling the outer surfaces of the plurality of cable cores to form a filling layer; and finally, sequentially coating a mineral fireproof layer and a low-smoke halogen-free outer sheath on the outer surface of the filling layer to obtain the high-temperature-resistant fireproof cable.
Example 3
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the number of the cable cores is 4, each cable core comprises an annealing twisted copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside, wherein the mineral insulating layer is a mica tape material with at least three layers, the mica tape material is a aureola tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is made of the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm thick insulating isolation layer; the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight: 100 parts of polyolefin resin, 25 parts of argil, 25 parts of talcum powder, 8 parts of silica sol, 18 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is the modified polyethylene prepared in the example 1, and the thickness of the low-smoke halogen-free outer sheath is 3mm; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
Example 3 differs from example 2 in that the parts by weight of the polyolefin resin in the low smoke zero halogen outer jacket are changed.
Example 4
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the number of the cable cores is 4, and each cable core comprises an annealing twisted copper conductor from inside to outsideThe mica tape comprises a body, a mineral insulating layer and an insulating isolation layer, wherein the mineral insulating layer is a mica tape with no less than three layers, the mica tape is a phlogopite tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is prepared from the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm of insulating isolation layer thickness; the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight: 120 parts of polyolefin resin, 25 parts of argil, 25 parts of talcum powder, 8 parts of silica sol, 18 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is the modified polyethylene prepared in the example 1, and the thickness of the low-smoke halogen-free outer sheath is 3mm; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
Example 4 differs from example 2 in that the parts by weight of the polyolefin resin in the low smoke zero halogen outer jacket are changed.
Example 5
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the number of the cable cores is 4, each cable core comprises an annealing twisted copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside, wherein the mineral insulating layer is a mica tape material with at least three layers, the mica tape material is a aureola tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is made of the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm thick insulating isolation layer; the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight: 130 parts of polyolefin resin and argil25 parts of talcum powder, 25 parts of silica sol, 8 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is the modified polyethylene prepared in the example 1, and the thickness of the low-smoke halogen-free outer sheath is 3mm; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
Example 5 differs from example 2 in that the parts by weight of the polyolefin resin in the low smoke zero halogen outer jacket are changed.
Example 6
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the number of the cable cores is 4, each cable core comprises an annealing stranded copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside, wherein the mineral insulating layer is a mica tape material with no less than three layers, the mica tape material is a phlogopite tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is prepared from the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm thick insulating isolation layer; the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight: 110 parts of polyolefin resin, 20 parts of argil, 25 parts of talcum powder, 8 parts of silica sol, 18 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is the modified polyethylene prepared in the example 1, and the thickness of the low-smoke halogen-free outer sheath is 3mm; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
Example 6 differs from example 2 in that the parts by weight of the kaolin in the low smoke zero halogen outer jacket are changed.
Example 7
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the describedThe number of the cable cores is 4, each cable core comprises an annealing twisted copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside, wherein the mineral insulating layer is a mica tape material with at least three layers, the mica tape material is a golden mica tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is made of the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm thick insulating isolation layer; the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight: 110 parts of polyolefin resin, 25 parts of argil, 30 parts of talcum powder, 8 parts of silica sol, 18 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is the modified polyethylene prepared in the example 1, and the thickness of the low-smoke halogen-free outer sheath is 3mm; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
Example 7 differs from example 2 in that the parts by weight of talc in the low smoke zero halogen outer sheath are changed.
Example 8
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the number of the cable cores is 4, each cable core comprises an annealing stranded copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside, wherein the mineral insulating layer is a mica tape material with no less than three layers, the mica tape material is a phlogopite tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is prepared from the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm thick insulating isolation layer; the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath consists ofThe traditional Chinese medicine is prepared from the following raw materials in parts by weight: 110 parts of polyolefin resin, 25 parts of argil, 25 parts of talcum powder, 8 parts of silica sol, 17 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is the modified polyethylene prepared in the example 1, and the thickness of the low-smoke halogen-free outer sheath is 3mm; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
Example 8 differs from example 2 in that the parts by weight of magnesium hydroxide in the low smoke zero halogen outer jacket are changed.
Example 9
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the number of the cable cores is 4, each cable core comprises an annealing stranded copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside, wherein the mineral insulating layer is a mica tape material with no less than three layers, the mica tape material is a phlogopite tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is prepared from the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm of insulating isolation layer thickness; the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight: 110 parts of polyolefin resin, 25 parts of argil, 25 parts of talcum powder, 8 parts of silica sol, 19 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is the modified polyethylene prepared in the example 1, and the thickness of the low-smoke halogen-free outer sheath is 3mm; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
Example 9 differs from example 2 in that the parts by weight of magnesium hydroxide in the low smoke zero halogen outer jacket are changed.
Comparative example 1
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outsideA filling layer is arranged among the plurality of cable cores in the mineral fireproof layer; the number of the cable cores is 4, each cable core comprises an annealing stranded copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside, wherein the mineral insulating layer is a mica tape material with no less than three layers, the mica tape material is a phlogopite tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is prepared from the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm thick insulating isolation layer; the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight: 110 parts of polyolefin resin, 25 parts of argil, 25 parts of talcum powder, 8 parts of silica sol, 18 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is a mixture of polyethylene, ethylene vinyl acetate and polypropylene, the mass ratio of the polyethylene to the ethylene vinyl acetate to the polypropylene is 3; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
The difference between comparative example 1 and example 2 is that the polyolefin resin in the low smoke zero halogen outer sheath is a blend of polyethylene, ethylene vinyl acetate and polypropylene.
Comparative example 2
A high-temperature-resistant fireproof cable comprises a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the number of the cable cores is 4, each cable core comprises an annealing stranded copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside, wherein the mineral insulating layer is a mica tape material with no less than three layers, the mica tape material is a phlogopite tape, the thickness of the mineral insulating layer is 0.5mm, the overlapping rate is 50%, and the insulating isolation layer is prepared from the following raw materials in parts by weight: 100 parts of polyethylene, 20 parts of glass powder, 25 parts of argil, 6 parts of sodium silicate, 4 parts of polyethylene wax and 2mm of insulating isolation layer thickness; the mineral fireproof layer consists of the following components in parts by weightThe raw materials are extruded to form: 30 parts of magnesium hydroxide, 15 parts of calcium carbonate, 35 parts of talcum powder, 17 parts of argil and 10 parts of adhesive, wherein the adhesive is silica sol, and the thickness of a mineral fireproof layer is 2mm; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight: 110 parts of polyolefin resin, 25 parts of argil, 25 parts of talcum powder, 8 parts of silica sol, 18 parts of magnesium hydroxide and 5 parts of polyethylene wax, wherein the polyolefin resin is polyethylene, and the thickness of the low-smoke halogen-free outer sheath is 3mm; the filling layer is made of glass fiber and has a specific gravity of 1.8g/cm 3 。
The difference between comparative example 2 and example 2 is that the polyolefin resin in the low smoke zero halogen outer jacket is polyethylene.
The high temperature resistant fireproof cables described in examples 3 to 9 and comparative examples 1 to 2 were prepared according to the process described in example 2.
Comparative example 3
A high-temperature-resistant fireproof cable sold in China is purchased from Shenpeng cable company Limited in Henan province.
Test example 1
The high-temperature-resistant fireproof cables prepared in the embodiments 2 to 9 and the comparative examples 1 to 3 are subjected to related performance tests, wherein the line integrity test is carried out according to BS6387 fire test method for maintaining the line integrity of the cable under the flame condition, wherein the fire resistance C only requires that the cable is electrified for 180min under the flame of 950-1350 ℃ without breakdown, the fire resistance and water resistance W requires that the cable is sprayed with water for 15min after being electrified for 15min under the flame of 650-800 ℃ without breakdown, and the fire resistance and impact resistance Z requires that the cable is knocked and vibrated for 15min under the flame of 950-1350 ℃ without breakdown; smoke density (minimum light transmittance) test according to GB/T17651.1-2021 "smoke density determination of cable or optical cable burning under specific conditions"; the corrosion resistance test is carried out according to GB/T17650.2-2021 test method for gas released when materials from cables or optical cables are burnt; the temperature of the heat resistance test box is (250 +/-2) DEG C, a sample is placed in the test box for 72h, and the sheath does not need to shrink and deform; the temperature of the ozone-resistant test chamber is (40 +/-2) ° C, the relative humidity is (55 +/-5)%, and the ozone concentration (volume fraction) (200 +/-50) × 10 -6 Percent, air flow is 0.3 times of the volume of the test box/min, a sample is placed in the test box for 96 hours, and the surface of the sheath is subjected to bending testNo visible cracks should be observed; the test results are shown in table 1.
TABLE 1 high temperature resistant fireproof cable Performance test results
As can be seen from the results in Table 1, the circuit integrity, smoke density, corrosion resistance, heat resistance and ozone resistance of the high temperature resistant fireproof cables prepared in examples 2-9 are obviously better than those of comparative examples 1-3, wherein the high temperature resistant fireproof cable prepared in example 2 has the best combination property; as can be seen from the data of examples 2 to 9, in the low-smoke halogen-free outer sheath mixture system, the parts by weight of the modified polyethylene, the argil, the talcum powder and the magnesium hydroxide can influence the comprehensive performance of the high-temperature-resistant fireproof cable; example 2 compared with comparative examples 2-3, the modified polyethylene added in example 2 can significantly enhance the line integrity, smoke density, corrosion resistance, heat resistance and ozone resistance of the high-temperature resistant fireproof cable.
Polyolefin materials are an important general-purpose plastic, and are widely applied to industries such as daily necessities, packaging, automobiles and the like due to large yield, wide application range and low price. However, due to the non-polarity and crystallinity of the material, when the material is compounded with other materials, a compatilizer or a grafted polar group is required to be added to improve the blending effect of the material and other materials, so that the application range of the material is expanded. The invention discloses a high-temperature-resistant fireproof cable, wherein a low-smoke halogen-free outer sheath is made of polyolefin resin, argil, talcum powder, silica sol, magnesium hydroxide and polyethylene wax, wherein the polyolefin resin is modified polyethylene. The polyethylene structure is chemically modified, the original characteristics are maintained, meanwhile, polar groups are introduced, the modified polyethylene and other raw materials are synergistic, and the performances of high flame retardance, high flexibility, corrosion resistance, heat resistance, oxidation resistance, low smoke, fire resistance, impact resistance and the like of the fireproof cable are obviously improved. The hydroxyl and quinoline ring structures are introduced into the polyethylene structure, so that the intermolecular hydrogen bond effect and the stability of the quinoline ring structure can be utilized to inhibit molecular motion and improve the heat resistance of the polyethylene polymer, and the polyethylene polymer and other raw materials have synergistic effect, so that the low-smoke halogen-free outer sheath can keep high flexibility, high elasticity, excellent mechanical property and insulating property at the environmental temperature of 250 ℃; in addition, the quinoline ring structure can also improve the oxidation resistance of the polyethylene polymer, so that the low-smoke halogen-free outer sheath has excellent oxidation resistance. Under the condition of high temperature of more than 550 ℃, the modified polyethylene and inorganic mineral substances such as argil, talcum powder and the like can quickly form a compact and hard ceramic armor body, so that the internal structure of the cable can be effectively protected, and the conditions that a mineral fireproof layer cracks, falls off and the like are avoided, and further the flame retardance, the fire resistance, the water resistance and the impact resistance of the cable are influenced. The high-temperature-resistant fireproof cable provided by the invention has the performances of high flame retardance, high flexibility, corrosion resistance, heat resistance, oxidation resistance, low smoke, fire prevention, impact resistance and the like, and can work for a long time at the ambient temperature of 250 ℃ and also work for a short time at the ambient temperature of 1340 ℃ in an emergency.
Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A high-temperature-resistant fireproof cable is characterized by comprising a plurality of cable cores, a mineral fireproof layer and a low-smoke halogen-free outer sheath from inside to outside, wherein a filling layer is arranged between the plurality of cable cores in the mineral fireproof layer; the low-smoke halogen-free outer sheath is prepared from the following raw materials in parts by weight:
100-130 parts of polyolefin resin, 20-25 parts of argil, 25-30 parts of talcum powder, 8-10 parts of silica sol, 17-19 parts of magnesium hydroxide and 3-8 parts of polyethylene wax;
the polyolefin resin is modified polyethylene, and the preparation method of the modified polyethylene comprises the following steps:
s1, polyethylene, glycidyl methacrylate, styrene and dicumyl peroxide are uniformly mixed in advance, and are subjected to melt mixing grafting in a rheometer to obtain a grafted product, the grafted product is placed in xylene, is heated to 95-110 ℃, is stirred and refluxed for 1-2 hours, is added with acetone, is continuously stirred for 40-50min, is cooled to room temperature, is filtered, is taken out filter residue, and is washed and dried to obtain an intermediate 1, wherein the intermediate 1 has a structural formula:
s2, sequentially adding the intermediate 1 obtained in the step S1, xylene, chromium acetate and quinoline-2-carboxylic acid into a reactor, heating to 100-105 ℃, stirring for 4-5h, cooling to room temperature, filtering, taking filter residue, and drying to obtain the modified polyethylene, wherein the structural formula of the modified polyethylene is as follows:
2. the high-temperature-resistant fireproof cable according to claim 1, wherein the mass ratio of the glycidyl methacrylate to the styrene to the polyethylene in step S1 is 1.0-1.2.
3. The high-temperature-resistant fireproof cable according to claim 1, wherein in step S1, the grafting temperature is 170-190 ℃, the time is 15-20min, and the rotational speed of the rheometer is 32-35rpm.
4. The high-temperature-resistant fireproof cable according to claim 1, wherein the mass ratio of the quinoline-2-carboxylic acid to the intermediate 1 in step S2 is 1.
5. The high-temperature-resistant fireproof cable according to claim 1, wherein the number of the cable cores is 4-6, and each cable core comprises an annealed stranded copper conductor, a mineral insulating layer and an insulating isolation layer from inside to outside; the mineral insulating layer is at least three layers of mica tapes, and the mica tapes are golden mica tapes or synthetic mica tapes; the insulation isolation layer is prepared from the following raw materials in parts by weight: 90-100 parts of polyethylene, 20-30 parts of glass powder, 20-30 parts of pottery clay, 4-7 parts of sodium silicate and 3-5 parts of polyethylene wax.
6. The high-temperature-resistant fireproof cable according to claim 1, wherein the mineral fireproof layer is formed by extruding the following raw materials in parts by weight: 30-40 parts of magnesium hydroxide, 10-20 parts of calcium carbonate, 30-40 parts of talcum powder, 15-20 parts of pottery clay and 8-10 parts of adhesive; the adhesive is organic silicon resin or silica sol.
7. A method for preparing a high temperature resistant fireproof cable according to any one of claims 1 to 6, comprising the steps of:
a1, mixing and granulating by using a low-smoke halogen-free outer sheath: weighing polyolefin resin, argil, talcum powder, silica sol, magnesium hydroxide and polyethylene wax according to the weight ratio, uniformly mixing, adding into a double-screw extruder, and extruding and granulating;
a2, cabling: sequentially coating a mineral insulating layer and an insulating isolation layer on the outer surface of the annealed stranded copper conductor to obtain a cable core; filling the outer surfaces of the plurality of cable cores to form a filling layer; and finally, sequentially coating a mineral fireproof layer and a low-smoke halogen-free outer sheath on the outer surface of the filling layer to obtain the high-temperature-resistant fireproof cable.
8. The method for preparing a high temperature resistant fireproof cable according to claim 7, wherein the rotation speed of the screws in the twin-screw extruder in step A1 is 120-150r/min, and the temperature of the whole zone is 250-300 ℃.
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| CN117524570A (en) * | 2023-11-29 | 2024-02-06 | 温州网牌电线电缆有限公司 | High-temperature-resistant double-layer ceramic mica fireproof wire |
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| CN117524570A (en) * | 2023-11-29 | 2024-02-06 | 温州网牌电线电缆有限公司 | High-temperature-resistant double-layer ceramic mica fireproof wire |
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