CN114937524B - High-flame-retardance cable and preparation method thereof - Google Patents
High-flame-retardance cable and preparation method thereof Download PDFInfo
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- CN114937524B CN114937524B CN202210736703.5A CN202210736703A CN114937524B CN 114937524 B CN114937524 B CN 114937524B CN 202210736703 A CN202210736703 A CN 202210736703A CN 114937524 B CN114937524 B CN 114937524B
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- starch
- polyvinyl chloride
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- water
- flame
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- 238000002360 preparation method Methods 0.000 title claims abstract description 34
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 60
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 60
- 229920002472 Starch Polymers 0.000 claims abstract description 50
- 235000019698 starch Nutrition 0.000 claims abstract description 50
- 239000008107 starch Substances 0.000 claims abstract description 50
- 239000004114 Ammonium polyphosphate Substances 0.000 claims abstract description 36
- 235000019826 ammonium polyphosphate Nutrition 0.000 claims abstract description 36
- 229920001276 ammonium polyphosphate Polymers 0.000 claims abstract description 36
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 claims abstract description 32
- 229910000020 calcium bicarbonate Inorganic materials 0.000 claims abstract description 31
- 239000000654 additive Substances 0.000 claims abstract description 30
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims abstract description 10
- 235000019837 monoammonium phosphate Nutrition 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000006012 monoammonium phosphate Substances 0.000 claims abstract description 7
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 61
- 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 claims description 59
- 239000003063 flame retardant Substances 0.000 claims description 59
- 238000011049 filling Methods 0.000 claims description 58
- 239000011347 resin Substances 0.000 claims description 44
- 229920005989 resin Polymers 0.000 claims description 44
- 239000002250 absorbent Substances 0.000 claims description 36
- 238000007599 discharging Methods 0.000 claims description 33
- 235000019270 ammonium chloride Nutrition 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 229910001868 water Inorganic materials 0.000 claims description 28
- 230000000996 additive effect Effects 0.000 claims description 22
- 238000007664 blowing Methods 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 239000011805 ball Substances 0.000 claims 6
- 238000004519 manufacturing process Methods 0.000 claims 3
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 description 24
- 239000001301 oxygen Substances 0.000 description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 23
- 239000007789 gas Substances 0.000 description 22
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 20
- 230000000694 effects Effects 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 13
- 230000002829 reductive effect Effects 0.000 description 13
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- 239000001569 carbon dioxide Substances 0.000 description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 description 10
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 9
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 9
- 230000002745 absorbent Effects 0.000 description 8
- 229910019142 PO4 Inorganic materials 0.000 description 6
- 239000010452 phosphate Substances 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 6
- 239000000779 smoke Substances 0.000 description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010517 secondary reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- JXBAVRIYDKLCOE-UHFFFAOYSA-N [C].[P] Chemical compound [C].[P] JXBAVRIYDKLCOE-UHFFFAOYSA-N 0.000 description 1
- BWTHZGPZSRARLU-UHFFFAOYSA-M [NH4+].[Cl-].[Ca+].OC([O-])=O Chemical compound [NH4+].[Cl-].[Ca+].OC([O-])=O BWTHZGPZSRARLU-UHFFFAOYSA-M 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000012508 resin bead Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/221—Sheathing; Armouring; Screening; Applying other protective layers filling-up interstices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
-
- 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
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/025—Other inorganic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/16—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances gases
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
-
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- 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
- C08L2201/14—Gas barrier composition
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Insulated Conductors (AREA)
Abstract
The application relates to the technical field of circuit conveying equipment, in particular to a high-flame-retardance cable and a preparation method thereof. The high-flame-retardance cable comprises a plurality of cable cores, a polyvinyl chloride sheath sleeved on the cable cores and flame-retardance additives filled in the polyvinyl chloride sheath, wherein the flame-retardance additives comprise ammonium polyphosphate starch and calcium bicarbonate, and the ammonium polyphosphate starch is prepared from 10-20 parts of starch, 1-2 parts of monoammonium phosphate and 50-70 parts of ammonium polyphosphate through a dry-thermal reaction. The cable with high flame retardance has the advantages of high flame retardance and less generation of harmful gas during combustion.
Description
Technical Field
The application relates to the technical field of circuit conveying equipment, in particular to a high-flame-retardance cable and a preparation method thereof.
Background
With the rapid development of global economy and the enhancement of human environmental awareness, the requirements of various fields on the quality and performance of wires and cables are also higher and higher, particularly, the situation that wires are short-circuited to cause fire is particularly interesting, so how to improve the flame retardant performance of the cables is also a development direction of the wire and cable industry.
At present, in order to improve the flame retardant property of the cable, polyvinyl chloride or halogen-free low-smoke polyethylene is generally selected as a main raw material of the protective sleeve. However, although polyvinyl chloride can achieve a certain flame-retardant effect, polyvinyl chloride emits a large amount of harmful gas hydrogen chloride in the flame-retardant process, and halogen-free low-smoke polyethylene does not generate harmful gas, but has relatively poor flame-retardant performance.
Thus, there is a need for a highly flame retardant polyvinyl chloride cable that is less prone to harmful gases.
Disclosure of Invention
In order to improve the flame retardant effect of polyvinyl chloride and reduce the generation of harmful gases, the application provides a cable with high flame retardance and a preparation method thereof.
In a first aspect, the present application provides a cable with high flame retardancy, which adopts the following technical scheme:
the high-flame-retardance cable comprises a plurality of cable cores, a polyvinyl chloride sheath sleeved on the cable cores and flame-retardance additives filled in the polyvinyl chloride sheath, wherein the flame-retardance additives comprise ammonium polyphosphate starch and calcium bicarbonate, and the ammonium polyphosphate starch is prepared from 10-20 parts of starch, 1-2 parts of monoammonium phosphate and 50-70 parts of ammonium polyphosphate through a dry-thermal reaction.
When the cable heats up due to short circuit, the high temperature will drive the calcium bicarbonate to decompose to obtain water and carbon dioxide at first, and the carbon dioxide is used as non-combustible gas to separate oxygen, thereby playing a role in flame retardance.
And part of water can absorb hydrogen chloride gas decomposed by polyvinyl chloride at high temperature, so that the generation of smoke dust is effectively reduced. The hydrochloric acid liquid obtained by absorption can be subjected to secondary reaction with calcium bicarbonate or calcium carbonate, so that the generation of carbon dioxide is further promoted.
And the other part of water can be mixed with the ammonium polyphosphate starch, and excessive carbon dioxide can be used as a gas source to force the ammonium polyphosphate starch to expand, and finally a porous foam coke layer is obtained, so that the permeation of oxygen is further inhibited, and the flame retardant effect of the flame retardant additive is effectively improved.
Preferably, the preparation method of the ammonium polyphosphate starch comprises the following steps:
(1) Mixing starch, ammonium dihydrogen phosphate and water, and gelatinizing at 70-90deg.C to obtain gelatinized starch solution; (2) Mixing the gelatinized starch solution with ammonium polyphosphate, drying and grinding, and performing dry-heat reaction at 150-170 ℃ for 3-5h to obtain the ammonium polyphosphate starch.
Starch has a large amount of carbon and hydroxyl, namely, the starch has excellent char formation, and ammonium dihydrogen phosphate can be used as an acid source to cooperatively catalyze the starch to char, so that the flame retardant effect of the flame retardant additive is indirectly improved.
In addition, through the preparation method, the starch and the monoammonium phosphate can modify the surface of the ammonium polyphosphate, so that a large number of carbon-phosphorus crosslinked layers are formed on the surface of the ammonium polyphosphate, and the char formation and flame retardant effect of the flame retardant additive are further improved.
Preferably, the polyvinyl chloride sheath is provided with a plurality of first filling holes and a plurality of second filling holes from inside to outside at intervals, the flame retardant additive further comprises ammonium chloride, the ammonium polyphosphate starch and the calcium bicarbonate are filled in the first filling holes, and the ammonium chloride is filled in the second filling holes.
When the cable heats because of short circuit, water generated by decomposition of calcium bicarbonate can also dissolve ammonium chloride, and the dissolution of ammonium chloride belongs to an endothermic reaction, so that the temperature around the cable is effectively reduced, the polyvinyl chloride sheath is caused to be difficult to reach the burning temperature, and the flame retardant effect of the flame retardant additive is indirectly improved. The hydrogen chloride gas decomposed by the ammonium chloride at high temperature can be absorbed by water and then reacts with calcium bicarbonate or calcium carbonate, so that the generation of smoke dust is effectively reduced.
In addition, calcium bicarbonate is relatively unstable, so that it is easy to decompose in advance in high-temperature weather. If the ammonium chloride and the calcium bicarbonate are directly mixed, the mutual loss between the ammonium chloride and the calcium bicarbonate can easily occur, the phenomenon can be effectively reduced by a way of separating the calcium bicarbonate from the ammonium chloride, and the water can be contacted with the ammonium chloride due to the softening of the polyvinyl chloride under the condition of heating the cable, so that the flame retardant effect of the flame retardant additive is indirectly improved.
Preferably, the flame retardant additive further comprises water-absorbent resin balls, and the water-absorbent resin balls are arranged on the outer circumferential surface of the polyvinyl chloride sleeve.
Although the decomposition of the calcium bicarbonate can form part of water, under the condition that the cable heats, huge part of water escapes through a water vapor mode, and the arrangement of the water-absorbing resin balls can collect rainwater when the cable is normally used, so that when the cable heats, water in the water-absorbing resin balls can be extracted through high temperature, and the water mainly contacts with ammonium chloride and ammonium polyphosphate starch when the cable heats, and the flame retardant effect of the flame retardant additive is indirectly improved.
Preferably, the flame retardant additive consists of a composition comprising: 2-6 parts of calcium bicarbonate, 1-3 parts of ammonium polyphosphate starch, 0.5-1.5 parts of ammonium chloride and 1-3 parts of water-absorbent resin balls.
Preferably, the flame retardant additive consists of a composition comprising: 4 parts of calcium bicarbonate, 2 parts of ammonium polyphosphate starch, 1 part of ammonium chloride and 2 parts of water-absorbent resin balls.
As can be seen from the following experimental data, when the components of the flame retardant additive are in the proportion, the flame retardant additive has better flame retardant property, and the main reason is that the components can fully interact with each other in the given proportion, so that the flame retardant effect of the flame retardant additive is effectively improved.
In a second aspect, the present application provides a method for preparing a cable with high flame retardancy, which adopts the following technical scheme: the preparation method of the high-flame-retardance cable comprises the following steps:
s1, extrusion molding of a polyvinyl chloride sheath;
s2, fixing the water-absorbing resin balls on the outer peripheral surface of the polyvinyl chloride sheath;
s3, cooling and shaping the polyvinyl chloride sheath by cooling water, and then naturally airing;
s4, filling calcium bicarbonate and ammonium polyphosphate starch into the first filling holes, and filling ammonium chloride into the second filling holes;
s5, sealing two ends of the first filling hole and two ends of the second filling hole;
and S6, penetrating the wire cores into the polyvinyl chloride sheath to obtain the cable with high flame retardance.
In the S2 of the preparation method, the water-absorbent resin balls can be more simply and conveniently fixed on the outer peripheral surface of the polyvinyl chloride sheath because the polyvinyl chloride sheath is still in a soft state after extrusion molding. In the S3, the cooling and shaping mode through cooling water not only promotes the quick shaping of the polyvinyl chloride sheath, but also promotes the water-absorbing resin ball to absorb a certain amount of water in advance, thereby indirectly improving the flame retardant effect and the low smoke effect of the cable.
Preferably, in S2, the water-absorbent resin ball is fixed to the outer circumferential surface of the polyvinyl chloride sheath by an automatic mounting device;
the automatic installation device comprises a base, a filling pipeline symmetrically arranged on the base, a control feeding component arranged at one end of the filling pipeline and a control discharging component arranged at the other end of the filling pipeline;
the control discharging component comprises a control block and a timing air tap, a discharging pipeline is arranged in the control block, one end of the discharging pipeline faces the polyvinyl chloride sheath, the other end of the discharging pipeline is connected with the timing air tap, and the middle of the discharging pipeline is mutually perpendicular to and communicated with the filling pipeline.
When the water-absorbent resin balls need to be fixed on the outer peripheral surface of the polyvinyl chloride sheath, workers can transfer the water-absorbent resin balls into the filling pipeline through the control feeding component, then the water-absorbent resin balls are gradually transferred into the discharging pipeline, and then the water-absorbent resin balls can be blown out at the same time interval by only timing air supply to the timing air nozzles, so that the water-absorbent resin balls are automatically and uniformly transferred to the outer peripheral surface of the polyvinyl chloride sheath, and the operation difficulty of fixing the water-absorbent resin balls is effectively reduced.
Preferably, the discharging pipeline comprises a blowing part, an inclined part and a discharging part which are communicated with each other, the inclined part is communicated with the filling pipeline, the inclined part gradually inclines upwards from the blowing part to the discharging part, one end of the blowing part, which is far away from the inclined part, is mutually connected with the timing air tap, and one end of the discharging part, which is far away from the inclined part, is directed towards the polyvinyl chloride sheath.
When the water-absorbent resin balls are transferred from the filling pipeline to the discharging pipeline, the water-absorbent resin balls are firstly transferred to the inclined part, and the inclined part gradually inclines upwards from the blowing part to the discharging part, so that the water-absorbent resin balls are always positioned at the inclined part under the action of gravity, the possibility that the water-absorbent resin balls drop in advance is effectively reduced, and the stability of fixing the water-absorbent resin balls is indirectly improved.
Preferably, the control feeding component comprises a feeding hopper, a blowing cover plate and a lifter, the blowing cover plate is fixedly connected to the output end of the lifter, a feeding air tap is arranged on the blowing cover plate, the blowing cover plate covers the feeding hopper, and one end, far away from the control discharging component, of the filling pipeline is communicated with the feeding hopper.
When it is desired to transfer the water-absorbent resin pellets into the filling duct, the worker may first separate the air-blow cover plate from the hopper by means of the elevator, then place the water-absorbent resin pellets into the hopper, and then again cover the air-blow cover plate with the hopper by means of the elevator. And then, only the feeding air tap is continuously supplied with air, and the feeding air tap can always force the water-absorbent resin balls to transfer to the discharging pipeline, so that the stability of fixing the water-absorbent resin balls is further improved.
In summary, the present application has the following beneficial effects:
1. when the cable heats due to short circuit, the calcium bicarbonate is decomposed to obtain water and carbon dioxide, and the carbon dioxide is used as nonflammable gas to block oxygen, so that a flame retardant effect is achieved;
2. the water can absorb the hydrogen chloride gas decomposed by polyvinyl chloride at high temperature, thereby effectively reducing the generation of smoke dust. The hydrochloric acid liquid obtained through absorption can be subjected to secondary reaction with calcium bicarbonate or calcium carbonate, so that the generation of carbon dioxide is further promoted;
3. the water can be mixed with the ammonium polyphosphate starch, and the excessive carbon dioxide can be used as a gas source to force the ammonium polyphosphate starch to expand, and finally a porous foam coke layer is obtained, so that the penetration of oxygen is further inhibited, and the flame retardant effect of the flame retardant additive is effectively improved;
4. the water can also dissolve the ammonium chloride, and the dissolution of the ammonium chloride belongs to an endothermic reaction, so that the temperature around the cable is effectively reduced, and the flame retardant effect of the flame retardant additive is indirectly improved.
Drawings
FIG. 1 is a cross-sectional view of a polyvinyl chloride sheath;
FIG. 2 is a schematic view of the structure of the automatic mounting device;
fig. 3 is a cross-sectional view taken along line A-A of fig. 2.
Reference numerals illustrate: 1. a polyvinyl chloride sheath; 2. a wire core; 3. an automatic installation device; 11. a first filling hole; 12. a second filling hole; 31. a base; 32. filling a pipeline; 33. controlling a feed assembly; 34. controlling a discharging component; 331. a lifter; 332. a blowing cover; 333. a feed hopper; 334. a feeding air tap; 341. a control block; 342. timing air tap; 343. a discharge pipe; 3431. an air blowing part; 3432. an inclined portion; 3433. and a discharging part.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-3, examples and comparative examples.
Raw materials
Sources of the components in this application:
polyvinyl chloride CAS:9002-86-2; calcium bicarbonate CAS:3983-19-5; starch CAS:9005-52-8; monoammonium phosphate CAS:7722-76-1; ammonium polyphosphate CAS:68333-79-9; ammonium chloride CAS:12125-02-9.
Preparation example 1
An ammonium polyphosphate starch, the preparation method of which comprises the following steps:
(1) Mixing 1.5kg of starch, 0.15kg of monoammonium phosphate and 2kg of water, and gelatinizing at 80 ℃ to obtain gelatinized starch solution;
(2) The gelatinized starch solution was mixed with 6kg of ammonium polyphosphate, followed by dry grinding, and then dry-heat reaction was performed at 160 ℃ for 4 hours to obtain an ammonium polyphosphate starch.
PREPARATION EXAMPLES 2 to 5
The difference from preparation example 1 is that the proportions of starch, monoammonium phosphate and ammonium polyphosphate are different, as shown in Table 1.
TABLE 1 proportion Table (kg) of the components in preparation examples 1 to 5
| Starch | Monoammonium phosphate | Ammonium polyphosphate | |
| Preparation example 1 | 1.5 | 0.15 | 6.0 |
| Preparation example 2 | 1.0 | 0.2 | 7.0 |
| Preparation example 3 | 2.0 | 0.1 | 5.0 |
| Preparation example 4 | 0.8 | 0.22 | 4.5 |
| Preparation example 5 | 2.2 | 0.08 | 7.5 |
Preparation example 6
The difference from preparation example 1 is that the gelatinization temperature in (1) is 70℃and the dry heat temperature is 150℃and the dry heat time is 3 hours.
Preparation example 7
The difference from preparation example 1 is that the gelatinization temperature in (1) is 90℃and the dry heat temperature is 170℃and the dry heat time is 5 hours.
Examples
Example 1
The preparation method of the high-flame-retardance cable comprises the following steps:
s1, adding 40kg of polyvinyl chloride into a screw extruder, and then extruding and molding a polyvinyl chloride sheath 1, wherein the temperature of a feeding section of the screw extruder is 130 ℃, the temperature of a melting section is 160 ℃, the temperature of a solution conveying section is 150 ℃, and the rotating speed of a screw is 20r/min;
s2, uniformly fixing 2kg of water-absorbent resin balls on the outer peripheral surface of the polyvinyl chloride sheath 1 at intervals through an automatic mounting device 3;
s3, soaking the polyvinyl chloride sheath 1 in cooling water for cooling and shaping, and then naturally airing; wherein, the polyvinyl chloride sheath 1 after cooling molding is formed with a plurality of first filling holes 11 and a plurality of second filling holes 12 from inside to outside at intervals, and the number of the first filling holes 11 and the second filling holes 12 can be set according to practice at will, as shown in fig. 1;
s4, filling 4kg of calcium bicarbonate and 2kg of preparation example 1 into the first filling hole 11, and filling 1kg of ammonium chloride into the second filling hole 12;
s5, sealing the two ends of the first filling hole 11 and the two ends of the second filling hole 12 through epoxy pouring sealant LD-104;
s6, penetrating the four wire cores 2 into the polyvinyl chloride sheath 1 to obtain a cable with high flame retardance;
for convenience of description, preparation example 1, calcium bicarbonate, ammonium chloride and water-absorbent resin balls are collectively referred to as flame retardant additives, and the specific structure of the automatic mounting device 3 in S2 is as follows:
referring to fig. 2, the automatic installation device 3 includes a base 31, a filling pipe 32 symmetrically fixed to an upper end surface of the base 31, a control discharging assembly 34 provided at one end of the filling pipe 32, and a control feeding assembly 33 provided at the other end of the filling pipe 32. Note that the number of the filling pipes 32 may be arbitrarily set according to the actual situation, and in the present embodiment, the filling pipes 32 are provided with only two examples.
When it is necessary to fix the water absorbent resin balls to the outer circumferential surface of the polyvinyl chloride sheath 1, a worker may directly place the water absorbent resin balls at the control feeding assembly 33, and the control feeding assembly 33 automatically transfers the water absorbent resin balls to the control discharging assembly 34 through the filling pipe 32, and the control discharging assembly 34 automatically fixes the water absorbent resin to the outer circumferential surface of the polyvinyl chloride sheath 1 uniformly and at intervals.
With continued reference to fig. 2, the control feed assembly 33 includes a lift 331, a blowing cap 332 fixedly connected to the output end of the lift 331, and a feed hopper 333 fixedly connected to the end of the fill tube 32. The cavity of the feed hopper 333 is in communication with the fill tube 32, and the lifter drives the air cap 332 to cover or separate from the feed hopper 333, and the upper end surface of the air cap 332 is fixedly connected with two feed air nozzles 334.
When it is desired to feed the water absorbent resin pellets, a worker may directly place the water absorbent resin pellets into the hopper 333 and then open the elevator 331, and the elevator 331 covers the air-blowing cover 332 on the hopper 333. Thereafter, as long as gas is continuously supplied into the inlet nipple 334, the air flow may drive the absorbent resin beads to continuously transfer into the fill tube 32 and ultimately to the controlled discharge assembly 34.
Referring to fig. 2 and 3, the control discharge assembly 34 includes a control block 341 and a timing nozzle 342, the control block 341 is fixedly connected to an end of the filling pipe 32 remote from the feeding end, and the timing nozzle 342 is fixedly connected to the control block 341.
The inside fixedly connected with ejection of compact pipeline 343 of control pipe, and ejection of compact pipeline 343 and filling pipeline 32 one-to-one, the quantity of ejection of compact pipeline 343 and the quantity of filling pipeline can be according to actual arbitrary setting.
The discharge pipe 343 includes a blowing portion 3431, an inclined portion 3432, and a discharge portion 3433 which are sequentially communicated with each other. The air blowing portion 3431 communicates with the timing air nozzle 342, the inclined portion 3432 communicates with the filling pipe 32, and one end of the discharging portion 3433 remote from the inclined portion 3432 faces the polyvinyl chloride jacket 1.
In this embodiment, in order to reduce the possibility that the water-absorbent resin ball drops in advance, the inclined portion 3432 is gradually inclined upward from the air blowing portion 3431 toward the discharging portion 3433, so that the water-absorbent resin ball can be always located in the inclined portion 3432 under the action of gravity when the air is not supplied to the timing air nozzle 342, and can be ejected through the discharging portion 3433 when the air is supplied to the timing air nozzle 342.
In addition, in this embodiment, the above-mentioned fixed connection may be a conventional fixed connection manner such as welding, bolting, etc. according to actual use.
Examples 2 to 5
The difference from example 1 is that the content of each component in the flame retardant additive is different, as shown in Table 2.
TABLE 2 content Table (kg) of flame retardant additives in examples 1-5
| Preparation example 1 | Calcium bicarbonate | Ammonium chloride | Water-absorbing resin ball | |
| Example 1 | 2 | 4 | 1 | 2 |
| Example 2 | 1 | 6 | 1.5 | 1 |
| Example 3 | 3 | 2 | 0.5 | 3 |
| Example 4 | 0.5 | 6.5 | 1.7 | 0.5 |
| Example 5 | 3.5 | 1.5 | 0.3 | 3.5 |
Example 6
The difference from example 1 is that the water-absorbent resin balls were not added.
Example 7
The difference from example 6 is that no ammonium chloride was added.
Example 8
The difference from example 6 is that ammonium chloride, calcium bicarbonate and preparation example 1 are filled into the first filling hole.
Examples 9 to 14
The difference from example 1 is that preparation 1 is replaced with preparations 2 to 7 of the same content.
Comparative example
Comparative example 1
The difference from example 1 is that no flame retardant additive is filled.
Comparative example 2
The difference from example 7 is that preparation example 1 was not added.
Performance test
Detection method
1. Flame retardant Performance test
Three samples were taken from examples 1-14 and comparative examples 1-2, respectively, and then the core in the pvc jacket was taken out, and then an igniter was inserted into the pvc jacket, referring to GBT-2406-93 "plastic combustion performance test method-oxygen index method", and then the oxygen content was ignited and adjusted, and if the combustion time was greater than 180s, the oxygen content was decreased, and if the combustion time was less than 160s, the oxygen content was increased, and finally the average value of the oxygen content was taken as the oxygen index.
2. Harmful gas testing
Three samples were taken from examples 1-14 and comparative examples 1-2, respectively, the core in the polyvinyl chloride sheath was taken out, the oxygen content was adjusted to 50%, the igniter was then extended into the polyvinyl chloride sheath to ignite for 300s, the generated gas was then introduced into deionized water to mix, and finally the pH of the gas solution was measured and averaged.
Detection result: the results of the tests of examples 1 to 14 and comparative examples 1 to 2 are shown in Table 3.
TABLE 3 Table of the results of the tests of examples 1-14 and comparative examples 1-2
It can be seen from the combination of examples 1 to 5 and comparative example 1 and table 3 that the oxygen index and pH value of examples 1 to 5 are significantly improved as compared with comparative example 1, and thus it can be seen that the use of the flame retardant additive can effectively improve the flame retardant property of polyvinyl chloride and effectively reduce the amount of acid harmful gas generated by combustion of polyvinyl chloride.
Compared with the embodiment 1, the oxygen index and the pH value of the embodiment 2-3 are slightly reduced, and the oxygen index and the pH value of the embodiment 4-5 are further reduced, so that the flame retardant additive can promote the polyvinyl chloride to have better flame retardant property and harmful gas inhibition property in the proportion range of the embodiment 1-3, and particularly the effect of the embodiment 1 is outstanding.
As can be seen from the combination of example 1 and example 6 and the combination of table 3, the oxygen index and pH value of example 6 are significantly reduced compared with example 1, which is because, if the water absorbent resin is not added, the polyvinyl chloride sheath 1 burns, the water content in the flame retardant additive will be insufficient, which not only causes the dissolution of ammonium chloride to be hindered, but also affects the expansion of the polyammonium phosphate starch, and also affects the absorption of hydrogen chloride gas, thereby significantly reducing the flame retardant performance and the harmful gas suppression performance of the polyvinyl chloride sheath 1.
It can be seen from the combination of example 6 and examples 7-8 and Table 3 that example 7 has a further reduction in oxygen index and an increase in pH relative to example 6, due to the fact that dissolution of ammonium chloride reduces the ambient temperature and thus limits the combustion to some extent. However, ammonium chloride also tends to produce acidic hydrogen chloride gas at high temperatures, which results in a decrease in the pH.
The reason for this is that the oxygen index of example 8 is also reduced relative to example 6, because when ammonium chloride is mixed with calcium bicarbonate, the pre-decomposition of calcium bicarbonate will result in partial ammonium chloride failure, thereby reducing the flame retardant properties of the green ethylene jacket.
As can be seen from the combination of example 7 and comparative examples 1-2 and table 3, the oxygen index of comparative example 2 is significantly reduced relative to example 7, thus demonstrating that the polyammonium phosphate starch contributes to the relatively good flame retardant properties of the polyvinyl chloride jacket 1, in that the polyammonium phosphate starch can form a foamed coke layer at high temperature, thereby blocking oxygen and inhibiting combustion.
In contrast, comparative example 2 has a higher oxygen index and a higher pH value than comparative example 1, and thus shows that calcium bicarbonate itself has a certain flame retardant property improving effect and a harmful gas suppressing effect on the polyvinyl chloride jacket 1. The reason is that the decomposition of calcium bicarbonate can produce carbon dioxide, water and calcium carbonate, the carbon dioxide can block oxygen to inhibit combustion, the water can dissolve hydrogen chloride, and the hydrogen chloride solution produced by dissolution can react with the calcium bicarbonate or the calcium carbonate, so that the hydrogen chloride gas is eliminated.
It can be seen from the combination of examples 1 and examples 9 to 12 and Table 3 that the oxygen index of examples 9 to 10 is slightly lowered and the oxygen index of examples 11 to 12 is further lowered with respect to example 1, thereby indicating that the components in the polyammonium phosphate starch can promote the polyvinyl chloride sheath 1 to have more excellent flame retardant properties in the range of the mixture ratio of examples 1 and examples 9 to 10, wherein the flame retardant property improving effect of example 1 is the best.
It can be seen from the combination of examples 1 and examples 13 to 14 and Table 3 that the oxygen index of examples 13 to 14 is reduced relative to example 1, thereby demonstrating that the selection of a gelatinization temperature of 80℃and a dry heat temperature of 160℃and a dry heat time of 4 hours can promote the more excellent flame retardant property enhancing effect of the polyammonium phosphate starch in the preparation of the polyammonium phosphate starch.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (7)
1. The high-flame-retardance cable is characterized by comprising a plurality of wire cores (2), a polyvinyl chloride sheath (1) sleeved on the wire cores (2) and flame-retardance additives filled in the polyvinyl chloride sheath (1), wherein the flame-retardance additives comprise water-absorbing resin balls, ammonium chloride, ammonium polyphosphate starch and calcium bicarbonate, the water-absorbing resin balls are arranged on the outer peripheral surface of the polyvinyl chloride sheath (1), and the ammonium polyphosphate starch is prepared from 10-20 parts of starch, 1-2 parts of monoammonium phosphate and 50-70 parts of ammonium polyphosphate through a dry heat reaction; a plurality of first filling holes (11) and a plurality of second filling holes (12) are formed in the polyvinyl chloride sheath (1) at intervals from inside to outside, the first filling holes (11) are filled with the ammonium polyphosphate starch and the calcium bicarbonate, and the second filling holes (12) are filled with the ammonium chloride;
the preparation method of the high-flame-retardance cable comprises the following steps of:
s1, extruding and molding a polyvinyl chloride sheath (1);
s2, fixing the water-absorbing resin balls on the outer peripheral surface of the polyvinyl chloride sheath (1);
s3, cooling and shaping the polyvinyl chloride sheath (1) through cooling water, and then naturally airing;
s4, filling calcium bicarbonate and ammonium polyphosphate starch into the first filling holes (11), and filling ammonium chloride into the second filling holes (12);
s5, sealing two ends of the first filling hole (11) and two ends of the second filling hole (12);
and S6, penetrating the plurality of wire cores (2) into the polyvinyl chloride sheath (1) to obtain the cable with high flame retardance.
2. The high flame retardant cable of claim 1, wherein: the preparation method of the ammonium polyphosphate starch comprises the following steps:
(1) Mixing starch, ammonium dihydrogen phosphate and water, and gelatinizing at 70-90deg.C to obtain gelatinized starch solution;
(2) Mixing the gelatinized starch solution with ammonium polyphosphate, drying and grinding, and performing dry-heat reaction at 150-170 ℃ for 3-5h to obtain the ammonium polyphosphate starch.
3. The high flame retardant cable of claim 1, wherein: the flame-retardant additive consists of the following components: 2-6 parts of calcium bicarbonate, 1-3 parts of ammonium polyphosphate starch, 0.5-1.5 parts of ammonium chloride and 1-3 parts of water-absorbent resin balls.
4. A high flame retardant cable according to claim 3, wherein: the flame-retardant additive consists of the following components: 4 parts of calcium bicarbonate, 2 parts of ammonium polyphosphate starch, 1 part of ammonium chloride and 2 parts of water-absorbent resin balls.
5. The method of manufacturing a high flame retardant cable according to claim 1, wherein: s2, fixing the water-absorbing resin balls on the outer peripheral surface of the polyvinyl chloride sheath (1) through an automatic mounting device (3);
the automatic installation device (3) comprises a base (31), a filling pipeline (32) symmetrically arranged on the base (31), a control feeding component (33) arranged at one end of the filling pipeline (32) and a control discharging component (34) arranged at the other end of the filling pipeline (32);
the control discharging component (34) comprises a control block (341) and a timing air nozzle (342), a discharging pipeline (343) is arranged in the control block (341), one end of the discharging pipeline (343) faces the polyvinyl chloride sheath (1), the other end of the discharging pipeline (343) is connected with the timing air nozzle (342) mutually, and the middle part of the discharging pipeline (343) is mutually perpendicular to and communicated with the filling pipeline (32).
6. The method of manufacturing a high flame retardant cable according to claim 5, wherein: the discharging pipeline (343) comprises a blowing part (3431), an inclined part (3432) and a discharging part (3433) which are communicated with each other, the inclined part (3432) is communicated with the filling pipeline (32), the inclined part (3432) gradually inclines upwards from the blowing part (3431) to the discharging part (3433), one end, away from the inclined part (3432), of the blowing part (3431) is connected with the timing air nozzle (342), and one end, away from the inclined part (3432), of the discharging part (3433) faces the polyvinyl chloride sheath (1).
7. The method of manufacturing a high flame retardant cable according to claim 5, wherein: control feeding subassembly (33) include feeder hopper (333), blow cover (332) board and lift (331), blow cover (332) board fixed connection in the output of lift (331), be provided with feeding air cock (334) on blow cover (332) board, blow cover (332) board cover in on feeder hopper (333), fill pipeline (32) keep away from one end of control ejection of compact subassembly (34) with feeder hopper (333) intercommunication each other.
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