CN114334254B - Low-smoke halogen-free flame-retardant class A class B1 isolated mineral insulation fireproof cable - Google Patents
Low-smoke halogen-free flame-retardant class A class B1 isolated mineral insulation fireproof cable Download PDFInfo
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- CN114334254B CN114334254B CN202111682247.2A CN202111682247A CN114334254B CN 114334254 B CN114334254 B CN 114334254B CN 202111682247 A CN202111682247 A CN 202111682247A CN 114334254 B CN114334254 B CN 114334254B
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Abstract
The invention relates to the field of cable equipment, and discloses a low-smoke halogen-free flame-retardant class A B1 isolated mineral insulation fireproof cable, which comprises a cable core, an inner sheath, a mineral insulation layer, an isolation layer and an outer sheath from inside to outside, wherein an inorganic flame-retardant material is filled between the cable core and the inner sheath, the isolation layer comprises a first electrospun fiber layer, a ceramic polyolefin layer and a second electrospun fiber layer, metal salt is loaded on the first electrospun fiber layer, the second electrospun fiber layer is formed by electrospinning water-absorbing resin, and the inner sheath and the outer sheath are both low-smoke halogen-free polyolefin layers.
Description
Technical Field
The invention relates to the field of cable equipment, in particular to a low-smoke zero-halogen flame-retardant class A class B1 isolated mineral insulation fireproof cable.
Background
With the acceleration of urban and modern aspects of China, the domestic power system is rapidly developed, the demand and the requirement standard of cables are continuously improved, and the national industry standard specifies: the cable exceeding 5KV must use a shielding layer, and the main function of the shielding layer is to limit an electric field in the cable to isolate the cable from an external electric field and obtain uniform electric field distribution in an insulating layer, and meanwhile, the shielding layer also provides a smooth, continuous, conductive and equipotential interface for the insulating layer and a conductor. The cable shielding layer is a semiconductive layer with low resistivity and thinness, and can improve the distribution of power lines in the cable insulation layer and improve the insulation level of the cable. The semi-conductive shielding layer can not only alleviate the magnetic field generated by the cable because of larger current in the medium-high voltage cable, but also play a role in grounding protection.
In some existing flame-retardant mineral insulated cables, the shielding layer is simpler to set, the shielding effect is poorer, and when a metal net with higher strength is used as the shielding net, the mechanical property of the cable is greatly affected.
Disclosure of Invention
Therefore, the low-smoke halogen-free flame-retardant class A class B1 isolated mineral insulation fireproof cable needs to be provided, and the problem that the electrostatic shielding effect of a shielding net of the existing flame-retardant cable is limited is solved.
In order to achieve the aim, the invention provides a low-smoke halogen-free flame-retardant class A class B1 isolated mineral insulation fireproof cable which comprises a cable core, an inner sheath, a mineral insulation layer, an isolation layer and an outer sheath from inside to outside, wherein an inorganic flame-retardant material is filled between the cable core and the inner sheath, the isolation layer comprises a first electrospun fiber layer, a ceramic polyolefin layer and a second electrospun fiber layer, metal salt is loaded on the first electrospun fiber layer, the second electrospun fiber layer is formed by electrostatic spinning of water-absorbing resin, and the inner sheath and the outer sheath are both low-smoke halogen-free polyolefin layers.
Further, a plurality of conductive convex strips are circumferentially fixed on the inner side surface of the ceramic polyolefin layer, and the first electrospun fiber layer is tightly attached to the ceramic polyolefin layer. The electric charge that the electric convex strip was used for going away on the first electric spinning fibrous layer, simultaneously owing to the protruding setting of electric convex strip, the electric charge that the first electric spinning fibrous layer produced can concentrate more in the position corresponding with electric convex strip position to guarantee the shielding effect of first electric spinning fibrous layer.
Further, the conductive convex strips are arc-shaped. The shape with sharp corners such as a conventional triangle, rectangle and the like is avoided, and the first electrospun fiber is prevented from being completely attached and fixed with the ceramic polyolefin layer due to the existence of the sharp corners.
Further, the preparation method of the first electrospun fiber layer comprises the following steps:
(1) Preparing spinning solution by using a high polymer material, and preparing the spinning solution into an electrospun fiber membrane by electrostatic spinning equipment;
(2) Preparing a metal salt solution, wherein the metal salt solution is loaded on the electrospun fiber membrane prepared in the step (1) through an electrostatic spraying technology or a hydrothermal reaction, so as to prepare a first electrospun fiber layer.
Further, the electrospun fibers are hollow fibers. When the metal salt is loaded by hydrothermal reaction, the hollow fiber membrane is able to load more metal ions than a solid electrospun fiber membrane.
Further, the metal salt is a soluble salt of copper, silver, zinc, iron, cobalt or nickel, and the water-absorbent resin is a polyacrylic resin.
Further, an armor layer is arranged between the isolation layer and the outer sheath. The armor layer is used for improving the mechanical strength of the cable and improving the corrosion resistance of the cable.
Further, the cable core comprises a copper conductor formed by twisting a plurality of copper wires and a crosslinked polyethylene layer coating the copper conductor.
Further, the inorganic flame retardant material is magnesium hydroxide and/or aluminum hydroxide. The magnesium hydroxide and the aluminum hydroxide have the characteristics of flame retardance, no toxicity and good thermal stability, and are environment-friendly inorganic flame retardants.
The technical scheme has the following beneficial effects:
according to the invention, a shielding network is formed on the first electrospun fiber layer due to the loaded metal salt, when the cable is subjected to an external electric field or magnetic field, the first electrospun fiber layer can play a role in electrostatic shielding, so that the normal use of the cable is effectively ensured, the water-absorbent resin of the second electrospun fiber layer can effectively absorb and isolate externally entered water molecules, the condition that materials in the ceramic polyolefin layer are aged due to damp is avoided, and the long-term use of the cable is facilitated.
Drawings
Fig. 1 is a structure of the cable according to example 1.
Fig. 2 shows the structure of the isolation layer of example 1.
Fig. 3 is a structure of the cable according to example 3.
Reference numerals illustrate:
1. a cable core; 11. a copper conductor; 12. a crosslinked polyethylene layer; 2. an inner sheath; 3. a mineral insulating layer; 4. an isolation layer; 41. a ceramic polyolefin layer; 42. a first electrospun fibrous layer; 43. a second electrospun fibrous layer; 5. an outer sheath; 6. an inorganic flame retardant material; 7. an armor layer; 8. conductive protruding strips; .
Detailed Description
In order to describe the technical content, constructional features, achieved objects and effects of the technical solution in detail, the following description is made in connection with the specific embodiments in conjunction with the accompanying drawings.
Example 1
Referring to fig. 1-2, the embodiment provides a low smoke halogen-free flame retardant class a class B1 isolated mineral insulation fireproof cable, which comprises a cable core 1, an inner sheath 2, a mineral insulation layer 3, an isolation layer 4 and an outer sheath 5 from inside to outside, wherein an inorganic flame retardant material 6 is filled between the cable core 1 and the inner sheath 2, the isolation layer 4 comprises a first electrospun fiber layer 42, a ceramic polyolefin layer 41 and a second electrospun fiber layer 43, a metal salt is loaded on the first electrospun fiber layer 42, the second electrospun fiber layer 43 is formed by electrospinning of water-absorbent resin, and the inner sheath 2 and the outer sheath 5 are both low smoke halogen-free polyolefin layers.
Further, the cable core 1 includes a copper conductor 11 formed by twisting a plurality of copper wires and a crosslinked polyethylene layer 12 covering the copper conductor 11. In this embodiment, the number of the cable cores 1 is six, and the inorganic flame retardant material 6 is a mixture of magnesium hydroxide and aluminum hydroxide.
The inner side surface of the ceramic polyolefin layer 41 is circumferentially fixed with a plurality of conductive raised strips 8, and the first electrospun fiber layer 42 is closely attached to the ceramic polyolefin layer 41. The conductive protruding strips 8 are used for guiding away static charges on the first electrospun fiber layer 42, and meanwhile, due to the protruding arrangement of the conductive protruding strips 8, charges generated by the first electrospun fiber layer 42 can be more concentrated at positions corresponding to the positions of the conductive protruding strips 8, so that the shielding effect of the first electrospun fiber layer 42 is ensured.
In this embodiment, the conductive protruding strips 8 are conductive copper wires, and six conductive protruding strips 8 are disposed on the inner side surface of the ceramic polyolefin layer 41. When the cable is in use, the tail ends of the wire raised strips are grounded.
Further, the conductive protruding strips 8 are arc-shaped. The use of the shape having sharp corners such as a conventional triangle, rectangle, etc. is avoided, and the first electrospun fibers are prevented from being completely adhered and fixed to the ceramic polyolefin layer 41 due to the presence of the sharp corners.
The preparation method of the first electrospun fiber layer 42 comprises the following steps:
(1) Preparing spinning solution by using a high polymer material, and preparing the spinning solution into an electrospun fiber membrane by electrostatic spinning equipment; the polymer material is polyurethane material.
(2) Preparing a metal salt solution, and spraying the metal salt solution onto the electrospun fiber membrane prepared in the step (1) by an electrostatic spraying technology, thereby preparing the first electrospun fiber layer 42. The concentration of the metal salt solution is controlled to be 1% -5%.
In this embodiment, the metal salt is copper nitrate
The metal salt is selected from copper sulfate, silver nitrate, zinc sulfate, ferric nitrate, cobalt sulfate, cobalt nitrate and nickel nitrate.
The first electrospun fiber layer 42 has different shielding efficiencies depending on the choice of metal salt.
The second electrospun fiber layer 43 is prepared by preparing a polyacrylic resin into a spinning solution, and then the spinning solution is prepared into the second electrospun fiber layer 43 by electrospinning.
When prepared, the first electrospun fiber layer 42 and the second electrospun fiber layer 43 may be wrapped around the mineral insulation layer 3 and the ceramic polyolefin layer 41, respectively, in the form of a wrap.
Example 2
The embodiment provides a low smoke zero halogen flame retardant class A class B1 isolated mineral insulation fireproof cable, which is different from embodiment 1 in that:
the metal salt solution is loaded on a first electrospun fiber layer through a hydrothermal method, the first electrospun fiber layer is hollow electrospun fiber, and the specific method comprises the following steps:
(1) Preparing spinning solution by using a high polymer material, preparing the spinning solution into an electrospun fiber membrane by using coaxial electrostatic spinning equipment, introducing air into the coaxial electrostatic spinning equipment, introducing the spinning solution into the coaxial electrostatic spinning equipment, and forming a hollow structure inside the prepared electrospun fiber.
(2) Preparing a metal salt solution, adding the electrospun fiber membrane prepared in the step (1) into the metal salt solution, heating to 60-80 ℃, cooling to room temperature after a certain time, washing with deionized water, and drying in an oven to obtain a first electrospun fiber layer.
When the hydrothermal method is used, the metal salt and the electrospun fiber layer are combined more tightly, and the hollow arrangement of the electrospun fiber is more beneficial to the loading of the metal salt.
Example 3
As shown in fig. 3, this embodiment provides a low smoke zero halogen flame retardant class a class B1 isolated mineral insulated fireproof cable, which is different from embodiment 1 in the following points:
an armor layer 7 is further arranged between the isolation layer 4 and the outer sheath 5. The armor layer 7 is used for improving the mechanical strength of the cable and improving the corrosion resistance of the cable.
According to the invention, the flame retardant level of the cable can reach the flame retardant level of the B1 level by using the low-smoke halogen-free polyolefin, the mineral insulating layer 3 and the inorganic flame retardant material 6, and the metal salt loaded on the first electrospun fiber layer 42 can form a shielding network, so that when the cable is subjected to the action of an external electric field or a magnetic field, the first electrospun fiber layer 42 can play a role of electrostatic shielding, the normal use of the cable is effectively ensured, the water-absorbent resin of the second electrospun fiber layer 43 can effectively absorb and isolate externally entered water molecules, and the situation that the material in the ceramic polyolefin layer 41 is aged due to being wetted is avoided, so that the long-term use of the cable is facilitated.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the statement "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article or terminal device comprising the element. Further, herein, "greater than," "less than," "exceeding," and the like are understood to not include the present number; "above", "below", "within" and the like are understood to include this number.
While the embodiments have been described above, other variations and modifications will occur to those skilled in the art once the basic inventive concepts are known, and it is therefore intended that the foregoing description and drawings illustrate only embodiments of the invention and not limit the scope of the invention, and it is therefore intended that the invention not be limited to the specific embodiments described, but that the invention may be practiced with their equivalent structures or with their equivalent processes or with their use directly or indirectly in other related fields.
Claims (8)
1. The low-smoke halogen-free flame-retardant A class B1 class isolated mineral insulation fireproof cable is characterized by comprising a cable core, an inner sheath, a mineral insulation layer, an isolation layer and an outer sheath from inside to outside, wherein an inorganic flame-retardant material is filled between the cable core and the inner sheath, the isolation layer comprises a first electrospun fiber layer, a ceramic polyolefin layer and a second electrospun fiber layer from inside to outside, metal salt is loaded on the first electrospun fiber layer, the second electrospun fiber layer is formed by electrostatic spinning of water-absorbing resin, and the inner sheath and the outer sheath are both low-smoke halogen-free polyolefin layers;
the ceramic polyolefin layer is characterized in that a plurality of conductive convex strips are circumferentially fixed on the inner side surface of the ceramic polyolefin layer, and the first electrospun fiber layer is tightly attached to the ceramic polyolefin layer.
2. The low smoke zero halogen flame retardant class a class B1 insulated fire rated cable of claim 1 wherein the conductive ribs are rounded.
3. The low smoke zero halogen flame retardant class a class B1 insulated fire rated cable according to claim 1, wherein the method of making the first electrospun fiber layer comprises the steps of:
(1) Preparing spinning solution by using a high polymer material, and preparing the spinning solution into an electrospun fiber membrane by electrostatic spinning equipment;
(2) Preparing a metal salt solution, wherein the metal salt solution is loaded on the electrospun fiber membrane prepared in the step (1) through an electrostatic spraying technology or a hydrothermal reaction, so as to prepare a first electrospun fiber layer.
4. A low smoke zero halogen flame retardant class a class B1 barrier mineral insulated fire rated cable according to claim 3 wherein the electrospun fibers are hollow fibers.
5. The low smoke zero halogen flame retardant class a class B1 barrier mineral insulated fire resistant cable of claim 1 wherein said metal salt is a soluble salt of copper, silver, zinc, iron, cobalt or nickel and said water absorbent resin is a polyacrylic resin.
6. The low smoke zero halogen flame retardant class a class B1 insulated fire resistant cable of claim 1, further comprising an armor layer between the insulation layer and the outer jacket.
7. The low smoke zero halogen flame retardant class a class B1 insulated fire rated cable of claim 1 wherein the cable core comprises a copper conductor formed by twisting a plurality of copper wires and a crosslinked polyethylene layer coating the copper conductor.
8. The low smoke zero halogen flame retardant class a class B1 barrier mineral insulated fire resistant cable of claim 1, wherein the inorganic flame retardant material is magnesium hydroxide and/or aluminum hydroxide.
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| CN202111682247.2A CN114334254B (en) | 2021-12-31 | 2021-12-31 | Low-smoke halogen-free flame-retardant class A class B1 isolated mineral insulation fireproof cable |
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| CN202111682247.2A CN114334254B (en) | 2021-12-31 | 2021-12-31 | Low-smoke halogen-free flame-retardant class A class B1 isolated mineral insulation fireproof cable |
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| CN114334254B true CN114334254B (en) | 2023-07-21 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104299692A (en) * | 2014-10-30 | 2015-01-21 | 江苏亨通线缆科技有限公司 | High-reliability data flexible cable used for building |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07262837A (en) * | 1994-03-17 | 1995-10-13 | Hitachi Cable Ltd | External damage detecting metal sheath power cable |
| US8541643B2 (en) * | 2005-08-05 | 2013-09-24 | Schill + Seilacher Aktiengesellschaft | Superabsorbents, nanofiber nonwovens finished therewith and use thereof |
| CN105331139A (en) * | 2015-11-18 | 2016-02-17 | 夏烬楚 | Ultrahigh-voltage transmission line with weak electromagnetic influence on buried pipeline |
| CN109215853A (en) * | 2018-08-28 | 2019-01-15 | 华东师范大学 | A kind of structure and preparation method of Shielded Twisted Pair cable |
| CN111540525A (en) * | 2020-05-26 | 2020-08-14 | 安徽太平洋电缆股份有限公司 | Heat-insulating bottle type B1-grade light fireproof cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104299692A (en) * | 2014-10-30 | 2015-01-21 | 江苏亨通线缆科技有限公司 | High-reliability data flexible cable used for building |
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