CN111370157A - Heat-resistant waterproof insulated cable and preparation method thereof - Google Patents
Heat-resistant waterproof insulated cable and preparation method thereof Download PDFInfo
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- CN111370157A CN111370157A CN202010207561.4A CN202010207561A CN111370157A CN 111370157 A CN111370157 A CN 111370157A CN 202010207561 A CN202010207561 A CN 202010207561A CN 111370157 A CN111370157 A CN 111370157A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000004020 conductor Substances 0.000 claims abstract description 53
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 48
- -1 ethylene-tetra fluoro ethylene Chemical group 0.000 claims abstract description 32
- 229920001973 fluoroelastomer Polymers 0.000 claims abstract description 29
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- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910000077 silane Inorganic materials 0.000 claims abstract description 20
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- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 16
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- 238000010521 absorption reaction Methods 0.000 claims description 9
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- 230000002441 reversible effect Effects 0.000 claims description 4
- BLDFSDCBQJUWFG-UHFFFAOYSA-N 2-(methylamino)-1,2-diphenylethanol Chemical compound C=1C=CC=CC=1C(NC)C(O)C1=CC=CC=C1 BLDFSDCBQJUWFG-UHFFFAOYSA-N 0.000 claims description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 238000003848 UV Light-Curing Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
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- 229920001179 medium density polyethylene Polymers 0.000 claims description 3
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- 238000007711 solidification Methods 0.000 claims description 2
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- 230000009286 beneficial effect Effects 0.000 description 2
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Images
Classifications
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- 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
- H01B3/42—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 polyesters; polyethers; polyacetals
- H01B3/421—Polyesters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
-
- 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
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/141—Insulating conductors or cables by extrusion of two or more insulating layers
-
- 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
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/148—Selection of the insulating material therefor
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- 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
- H01B13/06—Insulating conductors or cables
- H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
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- 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
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- 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
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
-
- 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
- H01B7/0009—Details relating to the conductive cores
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- 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
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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- 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
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- 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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1875—Multi-layer sheaths
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- 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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
- H01B7/228—Metal braid
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- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
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- 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
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- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
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Abstract
The invention discloses a heat-resistant waterproof insulated cable and a preparation method thereof.A zinc-plated steel wire conductor is symmetrically provided with five fan-shaped tin-plated copper wire conductors to form an inner conductor, and the outer part of the inner conductor is sequentially coated with a UV-cured unsaturated polyester resin layer, a fluororubber inner moisture-proof layer, a silane grafted crosslinked low-density polyethylene inner insulating layer, an ETFE (ethylene-tetra fluoro ethylene) outer insulating layer, a fluororubber outer moisture-proof layer, a polypropylene moisture-absorbing layer, a shielding mesh conductor layer, a PTFE (polytetrafluoroethylene) wrapped tape layer, a double-layer polyethylene water-proof layer, an inner sheath, a heat-resistant layer. The insulated cable has excellent heat resistance, moisture-proof and waterproof performance and electrical shielding property, has better laying environment adaptability and improves the safety and reliability of the cable.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a heat-resistant waterproof insulated cable and a preparation method thereof.
Background
A large number of cables are applied in power construction, the cable has good insulating property, the power supply reliability can be improved, the appearance of the city is beautified, and the popularization and application values are higher. In the cable construction process, the phenomenon that the cable is affected with damp and enters water sometimes happens, and the potential hidden danger influencing the safe operation of the cable is formed. When the cable is laid, the cable often passes through roads, bridges and the like, and due to reasons such as weather and the like, moisture can not permeate into the cable, the water tree aging phenomenon can occur under the action of an electric field, the cable insulation is damaged, and finally the cable breakdown accident is caused. If the thickness of the cable insulating layer is only increased, the aging phenomenon of the water tree is delayed, and the temporary solution and the permanent solution are not treated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a heat-resistant waterproof type insulated cable which has excellent heat resistance, moisture-proof and waterproof performance and electrical shielding property, has better laying environment adaptability and improves the safety and reliability of the cable. Meanwhile, a preparation method of the heat-resistant waterproof insulated cable is also provided.
The invention solves the technical problems through the following technical scheme.
A heat-resistant waterproof insulated cable is characterized in that five fan-shaped tinned copper wire conductors are symmetrically arranged on the periphery of a galvanized steel wire conductor to jointly form an inner conductor, and the outer portion of the inner conductor is sequentially coated with a UV-cured unsaturated polyester resin layer, a fluororubber inner moisture-proof layer, a silane grafted cross-linked low-density polyethylene inner insulating layer, an ETFE (ethylene-tetra fluoro ethylene) outer insulating layer, a fluororubber outer moisture-proof layer, a polypropylene moisture absorption layer, a shielding mesh conductor layer, a PTFE (polytetrafluoroethylene) winding tape layer, a double-layer polyethylene water-resistant layer, an inner sheath.
Preferably, the galvanized steel wire conductor is a galvanized steel monofilament or a galvanized steel stranded wire.
Preferably, the fan-shaped tinned copper wire conductor is formed by twisting a plurality of tinned copper stranded wires in a compound mode and tightly pressing the tinned copper stranded wires into a fan-shaped structure, and each tinned copper stranded wire is formed by twisting a plurality of tinned copper monofilament bundles.
Preferably, the thickness of the silane grafted cross-linked low-density polyethylene inner insulating layer is greater than that of the ETFE outer insulating layer.
Preferably, the thickness of the ETFE external insulation layer is one fourth to one half of the thickness of the silane grafted cross-linked low-density polyethylene internal insulation layer.
Preferably, the polypropylene moisture absorption layer is formed by lapping and wrapping a polypropylene winding belt on the fluororubber outer moisture-proof layer in a unidirectional spiral manner.
Preferably, the shielding mesh conductor layer is formed by weaving copper stranded wires with different wire diameters in a reverse spiral winding mode, each copper stranded wire is formed by concentrically twisting a stainless steel monofilament center reinforcing wire and a plurality of tinned copper monofilaments, the wire diameter of each stainless steel monofilament is 0.05mm to 0.5mm, and the wire diameter of each tinned copper monofilament is 0.05mm to 0.6 mm.
Preferably, the double-layer polyethylene water-blocking layer is formed by co-extruding an MDPE water-blocking inner layer at the inner side and an LDPE water-blocking outer layer at the outer side.
Preferably, the inner sheath and the outer sheath are both chloroprene rubber sheaths, and the heat-resistant layer is made of chlorinated polyethylene.
The preparation method of the heat-resistant waterproof insulated cable comprises the following specific steps:
the method comprises the following steps: obtaining an inner conductor through a stranding process;
step two: coating an unsaturated polyester resin layer on the inner conductor by using a dipping process and carrying out UV curing treatment to form a UV-cured unsaturated polyester resin layer;
step three: forming a fluororubber inner moisture-proof layer on the UV-cured unsaturated polyester resin layer by an extrusion coating process;
step four: forming a silane grafted and crosslinked low-density polyethylene inner insulating layer on the fluororubber inner moisture-proof layer by an extruding and crosslinking process; step five: forming an ETFE outer insulating layer on the silane grafted cross-linked low-density polyethylene inner insulating layer by an extrusion coating process, and keeping a gap between the ETFE outer insulating layer and the silane grafted cross-linked low-density polyethylene inner insulating layer;
step six: forming a fluororubber outer moisture-proof layer on the ETFE outer insulating layer by an extrusion coating process;
step seven: sequentially wrapping a polypropylene moisture absorption layer, a shielding mesh conductor layer and a PTFE wrapping tape layer on the ETFE outer insulating layer by a winding process;
step eight: and sequentially forming an inner sheath, a heat-resistant layer and an outer sheath on the PTFE tape layer by an extrusion coating process to prepare the insulated cable.
The invention has the beneficial effects that:
the UV-cured unsaturated polyester resin layer has high hardness and good heat resistance, and the UV-cured unsaturated polyester resin is not easy to expand and contract along with the temperature change of the cable and cannot be easily peeled from the inner conductor and the moisture-proof layer in the fluororubber. Moisture barrier and fluororubber outer moisture barrier have excellent dampproofing water blocking performance in the fluororubber, the moisture of UV solidification unsaturated polyester resin and polypropylene hygroscopic layer can be effectively obstructed by the moisture barrier in the fluororubber and the fluororubber outer moisture barrier, has inhibited that moisture further diffuses to the insulating layer to the effectual insulating layer that has delayed takes place the water tree ageing phenomenon, has excellent electrical insulation characteristic, and voltage resistance is better, prolongs cable life, durable use.
2. The linear expansion coefficient of zinc-plated steel wire conductor is less than fan-shaped tin-plated copper wire conductor, and the extension of fan-shaped tin-plated copper wire conductor is greater than zinc-plated steel wire conductor's extension to come the balanced extension that absorbs the cable, restrain the extension power of cable end, improve the adaptability of laying the environment.
3. The three-layer bonding body of the chloroprene rubber inner sheath, the chlorinated polyethylene heat-resistant layer and the chloroprene rubber outer sheath with high toughness, high strength and high wear resistance is adopted outside the cable, the mechanical strength is high, the sheath cracking phenomenon is effectively reduced, and the chlorinated polyethylene heat-resistant layer added between the chloroprene rubber inner sheath and the chloroprene rubber outer sheath is beneficial to improving the bonding performance and increasing the heat resistance.
4. The polypropylene hygroscopic layer is that the one-way spiral of polypropylene winding area overlaps around the package on the outer dampproof course of fluororubber, the polypropylene winding area can adopt iron material resin composite's winding area, has electric conductivity, can reduce the outer dampproof course of fluororubber and shield the potential difference between the netted conductor layer, reduces that electric field intensity is uneven and partial discharge takes place.
5. The shielding mesh conductor layer is formed by weaving copper stranded wires with different wire diameters in a reverse spiral winding mode, so that gaps can be effectively reduced, the friction phenomenon generated between tin-plated copper monofilaments is greatly reduced, the noise shielding characteristic is improved, and the cable has better flexibility. The copper stranded wire is formed by concentrically twisting a stainless steel monofilament center reinforcing wire and a plurality of tinned copper monofilaments, the stainless steel monofilament center reinforcing wire improves the mechanical strength of the copper stranded wire, the tinned copper monofilaments have excellent bending resistance and conductivity, the shielding layer formed by weaving the copper stranded wires formed by twisting the stainless steel monofilament center reinforcing wire and the tinned copper monofilaments is not easy to break, and the durability of the cable is greatly improved.
6. The shielding mesh conductor layer can effectively inhibit internal signals or noise from leaking to the outside and inhibiting interference from external signals, the PTFE wraps the belting layer, the friction coefficient is small, stress concentration of the shielding mesh conductor layer is reduced, the stability of the shielding characteristic is improved, effective shielding performance is ensured, and the shielding mesh conductor layer is durable in use.
7. The fan-shaped tinned copper wire conductor is formed by twisting a plurality of tinned copper stranded wires repeatedly and is compressed into a fan-shaped structure, and the tinned copper stranded wires are formed by twisting a plurality of tinned copper monofilament bundles, so that the reduction of the torsional stress of the tinned copper monofilaments is facilitated, the monofilament deformation is inhibited, and the tensile strength and the stability of the fan-shaped tinned copper wire conductor are improved.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of an embodiment of the present application.
In the figure: the composite material comprises 1-a galvanized steel wire conductor, 2-a fan-shaped tinned copper wire conductor, 3-a UV (ultraviolet) cured unsaturated polyester resin layer, 4-a fluororubber inner moisture-proof layer, 5-a silane grafted crosslinked low-density polyethylene inner insulating layer, 6-ETFE (ethylene-tetra-ethyl-fe) outer insulating layer, 7-a fluororubber outer moisture-proof layer, 8-a polypropylene moisture absorption layer, 9-a shielding mesh conductor layer, 10-a PTFE (polytetrafluoroethylene) wrapping tape layer, 11-a double-layer polyethylene water-resistant layer, 12-an inner sheath, 13-a heat-resistant layer and 14-an outer.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, in the heat-resistant waterproof insulated cable according to the embodiment of the present invention, five fan-shaped tinned copper wire conductors 2 are symmetrically arranged around one galvanized steel wire conductor 1 to form an inner conductor, wherein the galvanized steel wire conductor 1 may be a galvanized steel monofilament or a galvanized steel stranded wire. The fan-shaped tinned copper wire conductor 2 is formed by twisting a plurality of tinned copper stranded wires in a compound mode and tightly pressing the tinned copper stranded wires into a fan-shaped structure, and each tinned copper stranded wire is formed by twisting a plurality of tinned copper monofilament bundles.
The outer portion of the inner conductor is sequentially coated with a UV-cured unsaturated polyester resin layer 3, a fluororubber inner moisture-proof layer 4, a silane grafted cross-linked low-density polyethylene inner insulating layer 5, an ETFE outer insulating layer 6, a fluororubber outer moisture-proof layer 7, a polypropylene moisture absorption layer 8, a shielding mesh conductor layer 9, a PTFE (polytetrafluoroethylene) winding belting layer 10, a double-layer polyethylene water-blocking layer 11, an inner sheath 12, a heat-resistant layer 13 and an outer sheath 14. The thickness of the silane grafted crosslinked low-density polyethylene inner insulating layer 5 is greater than that of the ETFE outer insulating layer 6, and preferably, the thickness of the ETFE outer insulating layer 6 is one quarter to one half of that of the silane grafted crosslinked low-density polyethylene inner insulating layer 5. In one embodiment, the polypropylene moisture absorption layer 8 is formed by wrapping a polypropylene winding tape on the fluororubber outer moisture-proof layer 7 in a unidirectional spiral overlapping manner. In one embodiment, the shielding mesh conductor layer 9 is formed by weaving copper strands with different wire diameters in a reverse spiral winding manner, each copper strand is formed by concentrically twisting a stainless steel monofilament center reinforcing wire and a plurality of tinned copper monofilaments, the wire diameter of each stainless steel monofilament is 0.05mm to 0.5mm, and the wire diameter of each tinned copper monofilament is 0.05mm to 0.6 mm. In one embodiment, the double polyethylene water-blocking layer 11 is co-extruded from an inner MDPE water-blocking layer on the inside and an outer LDPE water-blocking layer on the outside. The inner sheath 12 and the outer sheath 14 are made of neoprene sheaths, for example, and the heat-resistant layer 13 is made of chlorinated polyethylene.
The preparation method of the heat-resistant waterproof insulated cable comprises the following specific steps:
the method comprises the following steps: obtaining an inner conductor through a stranding process;
step two: coating an unsaturated polyester resin layer on the inner conductor by using a dipping process and carrying out UV curing treatment to form a UV-cured unsaturated polyester resin layer;
step three: forming a fluororubber inner moisture-proof layer on the UV-cured unsaturated polyester resin layer by an extrusion coating process;
step four: forming a silane grafted and crosslinked low-density polyethylene inner insulating layer on the fluororubber inner moisture-proof layer by an extruding and crosslinking process; step five: forming an ETFE outer insulating layer on the silane grafted cross-linked low-density polyethylene inner insulating layer by an extrusion coating process, and keeping a gap between the ETFE outer insulating layer and the silane grafted cross-linked low-density polyethylene inner insulating layer;
step six: forming a fluororubber outer moisture-proof layer on the ETFE outer insulating layer by an extrusion coating process;
step seven: sequentially wrapping a polypropylene moisture absorption layer, a shielding mesh conductor layer and a PTFE wrapping tape layer on the ETFE outer insulating layer by a winding process;
step eight: and sequentially forming an inner sheath, a heat-resistant layer and an outer sheath on the PTFE tape layer by an extrusion coating process to prepare the insulated cable.
While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. Heat-resisting waterproof type insulated cable, characterized by: five fan-shaped tinned copper wire conductors (2) of peripheral symmetrical arrangement at a galvanized steel wire conductor (1) form the inner conductor jointly, the outer cladding of inner conductor has UV solidification unsaturated polyester resin layer (3), moisture barrier (4) in the fluororubber, silane graft crosslinking low density polyethylene inner insulating layer (5), ETFE outer insulating layer (6), moisture barrier (7) outside the fluororubber in proper order, polypropylene hygroscopic layer (8), shielding mesh conductor layer (9), PTFE around band layer (10), double polyethylene water-blocking layer (11), inner sheath (12), heat-resistant layer (13) and oversheath (14).
2. The heat and water resistant insulated cable according to claim 1, wherein: the galvanized steel wire conductor (1) is a galvanized steel monofilament or a galvanized steel stranded wire.
3. The heat and water resistant insulated cable according to claim 1, wherein: the fan-shaped tinned copper wire conductor (2) is formed by twisting a plurality of tinned copper stranded wires repeatedly and tightly pressing the tinned copper stranded wires into a fan-shaped structure, and each tinned copper stranded wire is formed by twisting a plurality of tinned copper monofilament bundles.
4. The heat and water resistant insulated cable according to claim 1, wherein: the thickness of the silane grafted cross-linked low-density polyethylene inner insulating layer (5) is larger than that of the ETFE outer insulating layer (6).
5. The heat and water resistant insulated cable according to claim 4, wherein: the thickness of the ETFE outer insulating layer (6) is one fourth to one half of the thickness of the silane grafted cross-linked low-density polyethylene inner insulating layer (5).
6. The heat and water resistant insulated cable according to claim 1, wherein: the polypropylene moisture absorption layer (8) is formed by lapping and wrapping the outer fluororubber moisture-proof layer (7) with a polypropylene winding belt in a unidirectional spiral manner.
7. The heat and water resistant insulated cable according to claim 1, wherein: the shielding mesh conductor layer (9) is that the copper strands of different line footpaths are each other for reverse spiral winding to weave and constitute, the copper strands comprises a stainless steel monofilament center reinforcement line and the concentric transposition of a plurality of tinned copper monofilaments, stainless steel monofilament line footpath is 0.05mm to 0.5mm, tinned copper monofilament line footpath is 0.05mm to 0.6 mm.
8. The heat and water resistant insulated cable according to claim 1, wherein: the double-layer polyethylene water-resistant layer (11) is formed by co-extruding an MDPE water-resistant inner layer at the inner side and an LDPE water-resistant outer layer at the outer side.
9. The heat and water resistant insulated cable according to claim 1, wherein: the inner sheath (12) and the outer sheath (14) are both chloroprene rubber sheaths, and the heat-resistant layer (13) is made of chlorinated polyethylene.
10. The preparation method of the heat-resistant waterproof insulated cable is characterized by comprising the following steps: the method comprises the following specific steps:
the method comprises the following steps: obtaining an inner conductor through a stranding process;
step two: coating an unsaturated polyester resin layer on the inner conductor by using a dipping process and carrying out UV curing treatment to form a UV-cured unsaturated polyester resin layer;
step three: forming a fluororubber inner moisture-proof layer on the UV-cured unsaturated polyester resin layer by an extrusion coating process;
step four: forming a silane grafted and crosslinked low-density polyethylene inner insulating layer on the fluororubber inner moisture-proof layer by an extruding and crosslinking process; step five: forming an ETFE outer insulating layer on the silane grafted cross-linked low-density polyethylene inner insulating layer by an extrusion coating process, and keeping a gap between the ETFE outer insulating layer and the silane grafted cross-linked low-density polyethylene inner insulating layer;
step six: forming a fluororubber outer moisture-proof layer on the ETFE outer insulating layer by an extrusion coating process;
step seven: sequentially wrapping a polypropylene moisture absorption layer, a shielding mesh conductor layer and a PTFE wrapping tape layer on the ETFE outer insulating layer by a winding process;
step eight: and sequentially forming an inner sheath, a heat-resistant layer and an outer sheath on the PTFE tape layer by an extrusion coating process to prepare the insulated cable.
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| CN202010207561.4A CN111370157A (en) | 2020-03-23 | 2020-03-23 | Heat-resistant waterproof insulated cable and preparation method thereof |
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| CN202010207561.4A CN111370157A (en) | 2020-03-23 | 2020-03-23 | Heat-resistant waterproof insulated cable and preparation method thereof |
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| AU2009356974A1 (en) * | 2009-12-23 | 2012-07-05 | Prysmian S.P.A. | Flexible electrical cable with resistance to external chemical agents |
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