CN111681824A - Novel low-smoke halogen-free flame-retardant B1-grade cable - Google Patents
Novel low-smoke halogen-free flame-retardant B1-grade cable Download PDFInfo
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- CN111681824A CN111681824A CN202010580676.8A CN202010580676A CN111681824A CN 111681824 A CN111681824 A CN 111681824A CN 202010580676 A CN202010580676 A CN 202010580676A CN 111681824 A CN111681824 A CN 111681824A
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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
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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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
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
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Abstract
The invention belongs to the technical field of cable materials, and particularly relates to a novel low-smoke halogen-free flame-retardant B1-grade cable which comprises a cable core and an outer cladding layer wrapped outside the cable core, wherein the cable core comprises a conductor core and an alkali-free glass fiber tape layer wrapped outside the conductor core, the conductor core comprises a conductor and a crosslinked polyethylene insulating layer wrapped outside the conductor, and the space between the conductor core and the alkali-free glass fiber tape layer is filled with an alkali-free glass fiber rope; the outer cladding layer sequentially comprises a high-flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer, an ammonium phosphate ABC dry powder layer, an alkali-free glass fiber belt layer and a low-smoke halogen-free B1-grade polyolefin outer sheath layer from inside to outside. The cable structure can permanently keep flexibility, the cable is not easy to burn under flame under the action of the ammonium phosphate ABC dry powder, a large amount of combustion heat can not be generated, and the cable is cooled under the action of dilution oxygen and cooling of the ammonium phosphate ABC dry powder, so that the heat release amount is greatly reduced when the cable burns.
Description
Technical Field
The invention belongs to the technical field of cable materials, and particularly relates to a novel low-smoke halogen-free flame-retardant B1-grade cable.
Background
With the improvement of flame-retardant requirements of people, the flame-retardant cable is widely applied and has obvious effect. In recent years, the construction and fire department requires that the places with dense personnel, such as subways, airports, high-rise buildings, and the like, adopt flame-retardant B1-grade cables with higher flame-retardant grades.
Currently, the flame-retardant B1-grade cable in the prior art mainly has the following two structures:
(1) the oxygen-isolating layer is produced by adopting fireproof mud. The material is non-combustible and relatively cheap, but after processing, the material can be crusted and hardened in about 1 month, so that the cable is very hard and cannot be bent, and the construction and use of the cable are seriously influenced.
(2) The oxygen barrier layer adopts high flame-retardant low-smoke halogen-free polyolefin. The cable can keep flexibility, but the flame retardant effect is general, and cable fire behaviour is unstable, and cable combustion heat release is unsatisfactory.
Therefore, the flame-retardant B1-grade cable with the structure capable of permanently keeping flexibility and the good flame-retardant effect is researched, and the flame-retardant B1-grade cable has very important application significance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a novel low-smoke halogen-free flame-retardant B1-grade cable. The cable structure can permanently keep flexibility, the cable is not easy to burn under flame under the action of the ammonium phosphate ABC dry powder, a large amount of combustion heat can not be generated, and the cable is cooled under the action of dilution oxygen and cooling of the ammonium phosphate ABC dry powder, so that the heat release amount is greatly reduced when the cable burns.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel low-smoke halogen-free flame-retardant B1-grade cable comprises a cable core and an outer cladding layer wrapped on the outer side of the cable core, wherein the cable core comprises a conductor core and an alkali-free glass fiber tape layer wrapped outside the conductor core, the conductor core comprises a conductor and a crosslinked polyethylene insulating layer wrapped outside the conductor, and the space between the conductor core and the alkali-free glass fiber tape layer is filled with an alkali-free glass fiber rope; the outer cladding layer sequentially comprises a high-flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer, an ammonium phosphate ABC dry powder layer, an alkali-free glass fiber belt layer and a low-smoke halogen-free B1-grade polyolefin outer sheath layer from inside to outside.
Preferably, the thickness of the high-flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer is 1.0-2.0mm, and the oxygen index is 38-42.
Preferably, two alkali-free glass fiber tape layers are wrapped outside the ammonium phosphate ABC dry powder layer.
Preferably, the thickness of the low-smoke halogen-free B1-grade polyolefin outer sheath layer is not less than 1.8 mm.
The ammonium phosphate ABC dry powder comprises the following main components: the dry powder particles form a hydrophobic protective layer by adopting a full silicification moisture-proof process by adding additives such as ammonium sulfate, silicone oil and the like into the triammonium phosphate, the iron phosphate dibasic and the ammonium dihydrogen phosphate, so as to achieve the purposes of moisture resistance and caking prevention. The ammonium phosphate ABC dry powder is halogen-free. The ammonium phosphate ABC dry powder can be used for fire extinguishment of combustible solids, combustible liquids, gases and live equipment.
The principle of ammonium phosphate ABC dry powder extinguishment is as follows:
the powder of the dry powder falls outside the surface of the combustible substance to generate chemical reaction and form a layer of glassy covering layer under the action of high temperature, thereby isolating oxygen and further extinguishing fire by suffocation. In addition, it has very good oxygen-diluting and cooling effects.
The preparation method of the cable comprises the following steps: the cable is formed by twisting a conductor, extruding and wrapping a crosslinked polyethylene insulating layer, filling a finished cable by using an alkali-free glass fiber rope, wrapping the alkali-free glass fiber belt (the glass fiber rope and the glass fiber belt do not burn under flame), extruding and wrapping a high-flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer outside the cable core, wherein the thickness is about 1.5mm, the oxygen index is 38-42, the high-flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer enters an ammonium phosphate ABC dry powder box under the condition that the oxygen-insulating layer is extruded at high temperature and is not cooled (the oxygen-insulating layer is soft at high temperature and has certain viscosity on the surface), the ammonium phosphate ABC dry powder is adhered to the surface of the oxygen-insulating layer through pressure mould pressing, the diameter of the pressure mould is 0.2-0.3 mm larger than the outer diameter of the oxygen-insulating layer, wrapping the glass fiber layer by wrapping 2 layers of the alkali-free glass fiber belt after the pressure mould, so as to avoid the dry powder from.
Advantageous effects
The invention discloses a novel low-smoke halogen-free flame-retardant B1-grade cable, which has a permanently kept flexible structure, is not easy to burn under flame under the action of ammonium phosphate ABC dry powder, does not generate a large amount of combustion heat, and is cooled through the dilution oxygen and cooling action of the ammonium phosphate ABC dry powder, so that the heat release amount of the cable during combustion is greatly reduced.
The cable of the invention is characterized in that under a 20.5kW fire source:
the flame spread FS is less than or equal to 1.5 mm;
the peak value of heat release rate HRR is less than or equal to 30 kW;
the total heat release THR1200 in the total heat release THR1200s in the fire 1200s is less than or equal to 15 MJ;
the burning growth rate index FIGRA is less than or equal to 150W/s;
the peak value SPR peak value of the smoke production rate is less than or equal to 0.25m 2/s;
the total smoke production TSP1200 in the fire 1200S is less than or equal to 50m2。
Drawings
FIG. 1: the cross-sectional structure of the novel low-smoke halogen-free flame-retardant B1-grade cable in embodiment 1 of the invention is shown schematically;
in the figure, 1: a conductor; 2: a crosslinked polyethylene insulating layer; 3: alkali-free glass fiber ropes; 4: an alkali-free fiberglass tape layer; 5: a high flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer; 6: an ammonium phosphate ABC dry powder layer; 7: an alkali-free fiberglass tape layer; 8: the low-smoke halogen-free B1-grade polyolefin outer sheath layer.
Detailed Description
Hereinafter, the present invention will be described in detail. Before the description is made, it should be understood that the terms used in the present specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Accordingly, the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of the invention, so it should be understood that other equivalents and modifications could be made thereto without departing from the spirit and scope of the invention.
The following examples are given by way of illustration of embodiments of the invention and are not to be construed as limiting the invention, and it will be understood by those skilled in the art that modifications may be made without departing from the spirit and scope of the invention. Unless otherwise specified, reagents and equipment used in the following examples are commercially available products.
Example 1
As shown in fig. 1, the novel low-smoke halogen-free flame-retardant B1-grade cable comprises a cable core and an outer cladding layer wrapped outside the cable core, wherein the cable core comprises a conductor core and an alkali-free glass fiber tape layer 4 wrapped outside the conductor core, the conductor core comprises a conductor 1 and a crosslinked polyethylene insulating layer 2 wrapped outside the conductor, and the space between the conductor core and the alkali-free glass fiber tape layer is filled with an alkali-free glass fiber rope 3;
the outer cladding layer sequentially comprises a high-flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer 5, an ammonium phosphate ABC dry powder layer 6, an alkali-free glass fiber belt layer 7 and a low-smoke halogen-free B1-grade polyolefin outer sheath layer 8 from inside to outside.
The thickness of the high-flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer is 1.5mm, and the oxygen index is 38-42.
And two alkali-free glass fiber tape layers are wrapped outside the ammonium phosphate ABC dry powder layer.
The thickness of the low-smoke halogen-free B1-grade polyolefin outer sheath layer is not less than 1.8 mm.
The ammonium phosphate ABC dry powder comprises the following main components: the dry powder particles form a hydrophobic protective layer by adopting a full silicification moisture-proof process by adding additives such as ammonium sulfate, silicone oil and the like into the triammonium phosphate, the iron phosphate dibasic and the ammonium dihydrogen phosphate, so as to achieve the purposes of moisture resistance and caking prevention. The ammonium phosphate ABC dry powder is halogen-free. The ammonium phosphate ABC dry powder can be used for fire extinguishment of combustible solids, combustible liquids, gases and live equipment.
This embodiment cable structure can keep flexibility forever, and the cable is difficult to the burning under flame under the dry powder effect of phosphorus ammonium ABC to can not produce a large amount of combustion heat, and through the dilution oxygen and the cooling action of phosphorus ammonium ABC dry powder, cool off the cable, heat release volume reduces by a wide margin when making the cable burning.
Example 2
The preparation method of the novel low-smoke halogen-free flame-retardant B1-grade cable in the embodiment 1 specifically comprises the following steps:
(1) preparing a cable core: twisting the conductors, extruding and wrapping the crosslinked polyethylene insulating layers outside the conductors to prepare conductor cores, filling a plurality of conductor cores with alkali-free glass fiber ropes, and wrapping the outer sides of the conductor cores with alkali-free glass fiber tapes (the glass fiber ropes and the glass fiber tapes are not burnt under flame), namely preparing cable cores for later use;
(2) coating an outer cladding layer: the cable core is externally extruded with a high flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer, the thickness is about 1.5mm, the oxygen index is 38-42, under the condition that the oxygen-insulating layer is extruded at high temperature and is not cooled (the oxygen-insulating layer is soft at high temperature and has certain viscosity on the surface), the phosphorus ammonium ABC dry powder enters a phosphorus ammonium ABC dry powder box, the phosphorus ammonium ABC dry powder is adhered on the surface of the oxygen-insulating layer through pressure mould pressing, the inner diameter of the pressure mould is 0.2-0.3 mm larger than the outer diameter of the oxygen-insulating layer, the dry powder layer is wrapped around a 2-layer alkali-free glass fiber tape after the pressure mould, the dry powder is prevented from falling off, a 1-layer low-smoke halogen-free B1-grade (low heat release) polyolefin outer sheath with the thickness not less than 1.8mm is.
Examples of the experiments
The novel low-smoke halogen-free flame-retardant B1-grade cable obtained in the embodiment 1 of the invention is subjected to a flame-retardant test under a 20.5kW fire source, and the test result is as follows:
the flame spread FS is less than or equal to 1.5 mm;
the peak value of heat release rate HRR is less than or equal to 30 kW;
the total heat release THR1200 in the total heat release THR1200s in the fire 1200s is less than or equal to 15 MJ;
the burning growth rate index FIGRA is less than or equal to 150W/s;
the peak value SPR peak value of the smoke production rate is less than or equal to 0.25m 2/s;
the total smoke production TSP1200 in the fire 1200S is less than or equal to 50m2。
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (5)
1. The novel low-smoke halogen-free flame-retardant B1-grade cable is characterized by comprising a cable core and an outer cladding layer wrapped outside the cable core, wherein the cable core comprises a conductor core and an alkali-free glass fiber tape layer wrapped outside the conductor core, the conductor core comprises a conductor and a crosslinked polyethylene insulating layer wrapped outside the conductor, and an alkali-free glass fiber rope is filled between the conductor core and the alkali-free glass fiber tape layer; the outer cladding layer sequentially comprises a high-flame-retardant low-smoke halogen-free polyolefin oxygen-insulating layer, an ammonium phosphate ABC dry powder layer, an alkali-free glass fiber belt layer and a low-smoke halogen-free B1-grade polyolefin outer sheath layer from inside to outside.
2. The novel low-smoke halogen-free flame-retardant B1 grade cable according to claim 1, wherein the thickness of the high-flame-retardant low-smoke halogen-free polyolefin oxygen barrier layer is 1.0-2.0mm, and the oxygen index is 38-42.
3. The novel low-smoke zero-halogen flame-retardant B1 grade cable according to claim 1, wherein the ammonium phosphate ABC dry powder layer is wrapped with two alkali-free glass fiber tape layers.
4. The novel low smoke zero halogen flame retardant grade B1 cable according to claim 1, wherein the thickness of the outer sheath of the low smoke zero halogen grade B1 polyolefin is not less than 1.8 mm.
5. The novel low-smoke zero-halogen flame-retardant B1 grade cable according to claim 1, wherein the ammonium phosphate ABC dry powder comprises the following main components: triammonium phosphate, iron dihydrogen phosphate, ammonium sulfate and silicone oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010580676.8A CN111681824A (en) | 2020-06-23 | 2020-06-23 | Novel low-smoke halogen-free flame-retardant B1-grade cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010580676.8A CN111681824A (en) | 2020-06-23 | 2020-06-23 | Novel low-smoke halogen-free flame-retardant B1-grade cable |
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| CN111681824A true CN111681824A (en) | 2020-09-18 |
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| CN202010580676.8A Pending CN111681824A (en) | 2020-06-23 | 2020-06-23 | Novel low-smoke halogen-free flame-retardant B1-grade cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112735636A (en) * | 2020-12-28 | 2021-04-30 | 安徽宏源特种电缆集团有限公司 | High-temperature-resistant fireproof flexible cable and manufacturing method thereof |
| CN114388190A (en) * | 2022-01-19 | 2022-04-22 | 迈特诺（马鞍山）特种电缆有限公司 | Fire-resistant communication cable for Ethernet for rolling stock |
-
2020
- 2020-06-23 CN CN202010580676.8A patent/CN111681824A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112735636A (en) * | 2020-12-28 | 2021-04-30 | 安徽宏源特种电缆集团有限公司 | High-temperature-resistant fireproof flexible cable and manufacturing method thereof |
| CN114388190A (en) * | 2022-01-19 | 2022-04-22 | 迈特诺（马鞍山）特种电缆有限公司 | Fire-resistant communication cable for Ethernet for rolling stock |
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