CN114334254A - Low-smoke halogen-free flame-retardant A-class B1-grade isolated mineral insulated fireproof cable - Google Patents
Low-smoke halogen-free flame-retardant A-class B1-grade isolated mineral insulated fireproof cable Download PDFInfo
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- CN114334254A CN114334254A CN202111682247.2A CN202111682247A CN114334254A CN 114334254 A CN114334254 A CN 114334254A CN 202111682247 A CN202111682247 A CN 202111682247A CN 114334254 A CN114334254 A CN 114334254A
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Abstract
The invention relates to the field of cable equipment, and discloses a low-smoke halogen-free flame-retardant A-class B1-grade isolated mineral insulated fireproof cable which comprises a cable core, an inner sheath, a mineral insulating layer, an isolating 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 isolating 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-absorbent 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 halogen-free flame-retardant A-class B1-grade isolated mineral insulated fireproof cable.
Background
With the acceleration of urbanization and modernization in China, the domestic power system is also developed rapidly, the demand and the requirement standard of cables are also improved continuously, and the national industry standard is stipulated: the shielding layer is used for the cable exceeding 5KV, the main function of the shielding layer is to limit an electric field in the cable to be isolated from an external electric field, uniform electric field distribution is obtained in the insulating layer, and the shielding layer also provides a smooth, continuous, conductive and equipotential interface for the insulating layer and the conductor. The cable shielding layer is a semi-conductive layer with low resistivity and is thin, so that the distribution of power lines in the cable insulating layer can be improved, and the insulation level of the cable can be improved. The semi-conductive shielding layer can not only alleviate the magnetic field generated by the cable due to larger current in the medium-high voltage cable, but also play a role in grounding protection.
In some current fire-retardant mineral insulated cable, the setting of shielding layer is comparatively simple, and shields the effect relatively poor, and when the higher metal mesh of shielding net working strength, will influence the mechanical properties of cable greatly.
Disclosure of Invention
Therefore, the low-smoke halogen-free flame-retardant A-class B1-grade isolated mineral insulated fireproof cable needs to be provided, and the problem that the electrostatic shielding effect of a shielding net of the conventional flame-retardant cable is limited is solved.
In order to achieve the purpose, the invention provides a low-smoke halogen-free flame-retardant A-class B1-grade isolated mineral-insulated fireproof cable which comprises a cable core, an inner sheath, a mineral insulating layer, an isolating 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 isolating 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-absorbent resin, and both the inner sheath and the outer sheath are low-smoke halogen-free polyolefin layers.
Furthermore, a plurality of conductive raised lines are fixed on the inner side surface of the ceramic polyolefin layer in the circumferential direction, and the first electrospun fiber layer is tightly attached to the ceramic polyolefin layer. The conductive raised lines are used for conducting away static charges on the first electrospinning fiber layer, and meanwhile due to the protruding arrangement of the conductive raised lines, charges generated by the first electrospinning fiber layer can be more concentrated in the position corresponding to the position of the conductive raised lines, so that the shielding effect of the first electrospinning fiber layer is guaranteed.
Further, the conductive convex strips are arc-shaped. The conventional shapes such as triangle, rectangle and the like with sharp corners are avoided, and the first electrospun fiber is prevented from being completely attached and fixed with the ceramic polyolefin layer due to the sharp corners.
Further, the preparation method of the first electrospun fiber layer comprises the following steps:
(1) preparing a spinning solution by using a high polymer material, and preparing the spinning solution into an electrospun fiber membrane by using electrostatic spinning equipment;
(2) and (2) preparing a metal salt solution, and loading the metal salt solution 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 fiber is a hollow fiber. When the metal salt is supported by hydrothermal reaction, the hollow fiber membrane can be supported with more metal ions than the solid electrospun fiber membrane.
Further, the metal salt is soluble salt of copper, silver, zinc, iron, cobalt or nickel, and the water-absorbing resin is polyacrylic resin.
Further, an armor layer is further 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 anti-corrosion capability of the cable.
Furthermore, the cable core comprises a copper conductor formed by twisting a plurality of copper wires and a cross-linked polyethylene layer covering 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, the first electrospun fiber layer can play an electrostatic shielding effect when the cable is subjected to the action of an external electric field or magnetic field, so that the normal use of the cable is effectively ensured, the water-absorbing resin of the second electrospun fiber layer can effectively adsorb and isolate water molecules entering from the outside, the aging condition of materials in the ceramic polyolefin layer due to moisture is avoided, and the long-term use of the cable is facilitated.
Drawings
Fig. 1 shows the structure of the cable described in example 1.
Fig. 2 is a structure of an isolation layer described in embodiment 1.
Fig. 3 shows the structure of the cable described in example 3.
Description of reference numerals:
1. a cable core; 11. a copper conductor; 12. a crosslinked polyethylene layer; 2. an inner sheath; 3. a mineral insulation layer; 4. an isolation layer; 41. a ceramized polyolefin layer; 42. a first electrospun fiber layer; 43. a second electrospun fiber layer; 5. an outer sheath; 6. an inorganic flame retardant material; 7. an armor layer; 8. a conductive rib; .
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Example 1
Referring to fig. 1-2, the embodiment provides a low-smoke halogen-free flame-retardant class a B1 isolated mineral-insulated fireproof cable, which includes, from inside to outside, a cable core 1, an inner sheath 2, a mineral insulating layer 3, an isolation layer 4, and an outer sheath 5, an inorganic flame-retardant material 6 is filled between the cable core 1 and the inner sheath 2, the isolation layer 4 includes a first electrospun fiber layer 42, a ceramized polyolefin layer 41, and a second electrospun fiber layer 43, the first electrospun fiber layer 42 is loaded with a metal salt, the second electrospun fiber layer 43 is formed by electrostatic spinning of a water-absorbent resin, and both the inner sheath 2 and the outer sheath 5 are 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 cross-linked 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.
A plurality of conductive ribs 8 are circumferentially fixed on the inner side surface of the ceramic polyolefin layer 41, and the first electrospun fiber layer 42 is tightly attached to the ceramic polyolefin layer 41. The conductive raised lines 8 are used for conducting away static charges on the first electrospun fiber layer 42, and meanwhile, due to the protruding arrangement of the conductive raised lines 8, charges generated by the first electrospun fiber layer 42 can be more concentrated on the position corresponding to the position of the conductive raised lines 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 used, the tail end of the conducting wire convex strip is grounded.
Further, the conductive protruding strip 8 is arc-shaped. The conventional shapes such as triangle and rectangle with sharp corners are avoided, and the first electrospun fiber is prevented from being completely adhered and fixed with the ceramic polyolefin layer 41 due to the sharp corners.
The method of making the first electrospun fiber layer 42 comprises the steps of:
(1) preparing a spinning solution by using a high polymer material, and preparing the spinning solution into an electrospun fiber membrane by using electrostatic spinning equipment; the high polymer material is a polyurethane material.
(2) And (3) preparing a metal salt solution, and spraying the metal salt solution on the electrospun fiber membrane prepared in the step (1) through an electrostatic spraying technology, so as to prepare a first electrospun fiber layer 42. The concentration of the metal salt solution is controlled between 1 and 5 percent.
The metal salt in this example 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 efficiency depending on the choice of metal salt.
Second electrospun fiber layer 43 was prepared by formulating the polyacrylic resin into a spinning solution, which was then electrospun into second electrospun fiber layer 43.
In preparation, the first electrospun fiber layer 42 and the second electrospun fiber layer 43 can be respectively wrapped with the mineral insulating layer 3 and the ceramified polyolefin layer 41 in a wrapping manner.
Example 2
The embodiment provides a low-smoke halogen-free flame-retardant A-class B1-grade isolated mineral insulated fireproof cable, which is different from the embodiment 1 in that:
the method comprises the following steps of (1) loading a metal salt solution on a first electrospun fiber layer by a hydrothermal method, wherein the first electrospun fiber layer is a hollow electrospun fiber, and the specific method comprises the following steps:
(1) preparing a 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, and introducing the spinning solution into the outer shaft, wherein the interior of the prepared electrospun fiber is of a hollow structure.
(2) And (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 a 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 favorable for loading the metal salt.
Example 3
As shown in fig. 3, the present embodiment provides a low-smoke halogen-free flame-retardant class a B1 isolated mineral-insulated fireproof cable, which is different from embodiment 1 in that:
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 application of the low-smoke halogen-free polyolefin, the mineral insulating layer 3 and the inorganic flame-retardant material 6 enables the flame-retardant grade of the cable to reach the flame-retardant grade of B1 grade, the metal salt loaded on the first electrospun fiber layer 42 can form a shielding network, when the cable is subjected to the action of an external electric field or magnetic field, the first electrospun fiber layer 42 can play an electrostatic shielding effect, so that the normal use of the cable is effectively ensured, the water-absorbent resin of the second electrospun fiber layer 43 can effectively adsorb and isolate water molecules entering from the outside, the condition that the material in the ceramic polyolefin layer 41 is aged due to moisture is avoided, and the long-term use of the cable is facilitated.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
Although the embodiments have been described, once the basic inventive concept is obtained, other variations and modifications of these embodiments can be made by those skilled in the art, so that the above embodiments are only examples of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes using the contents of the present specification and drawings, or any other related technical fields, which are directly or indirectly applied thereto, are included in the scope of the present invention.
Claims (9)
1. The low-smoke halogen-free flame-retardant A-class B1-grade isolated mineral insulated fireproof cable is characterized by comprising a cable core, an inner sheath, a mineral insulating layer, an isolating 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 isolating 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-absorbent resin, and the inner sheath and the outer sheath are both low-smoke halogen-free polyolefin layers.
2. The low-smoke halogen-free flame-retardant class-A B1 isolated mineral-insulated fireproof cable according to claim 1, wherein a plurality of conductive ribs 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.
3. The low-smoke halogen-free flame-retardant class-A B1 isolated mineral-insulated fireproof cable according to claim 2, wherein the conductive convex strip is arc-shaped.
4. The low smoke zero halogen flame retardant class a B1 isolated mineral insulated fireproof cable of claim 1, wherein the first electrospun fiber layer is prepared by a process comprising the steps of:
(1) preparing a spinning solution by using a high polymer material, and preparing the spinning solution into an electrospun fiber membrane by using electrostatic spinning equipment;
(2) and (2) preparing a metal salt solution, and loading the metal salt solution 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.
5. The low smoke zero halogen flame retardant class A B1 isolated form mineral insulated fireproof cable of claim 4, wherein the electrospun fiber is a hollow fiber.
6. The low-smoke halogen-free flame-retardant class-A B1 isolated mineral-insulated fireproof cable according to claim 1, wherein the metal salt is a soluble salt of copper, silver, zinc, iron, cobalt or nickel, and the water-absorbent resin is polyacrylic resin.
7. The low smoke zero halogen flame retardant class a B1 insulated mineral insulated fireproof cable of claim 1, wherein an armor layer is further included between the insulation layer and the outer sheath.
8. The low-smoke halogen-free flame-retardant class-A B1 isolated mineral-insulated fireproof cable of claim 1, wherein the cable core comprises a copper conductor formed by twisting a plurality of copper wires and a cross-linked polyethylene layer covering the copper conductor.
9. The low smoke zero halogen flame retardant class a B1 isolated form mineral insulated fireproof cable of claim 1, wherein the inorganic flame retardant material is magnesium hydroxide and/or aluminum hydroxide.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN114334254A true CN114334254A (en) | 2022-04-12 |
| CN114334254B CN114334254B (en) | 2023-07-21 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07262837A (en) * | 1994-03-17 | 1995-10-13 | Hitachi Cable Ltd | External damage detecting metal sheath power cable |
| CN102535016A (en) * | 2005-08-05 | 2012-07-04 | 希尔和塞拉彻有限公司 | Superabsorbents and nanofibre webs finished therewith |
| 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 |
| 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 |
-
2021
- 2021-12-31 CN CN202111682247.2A patent/CN114334254B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07262837A (en) * | 1994-03-17 | 1995-10-13 | Hitachi Cable Ltd | External damage detecting metal sheath power cable |
| CN102535016A (en) * | 2005-08-05 | 2012-07-04 | 希尔和塞拉彻有限公司 | Superabsorbents and nanofibre webs finished therewith |
| 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 |
| 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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