CN111681811B - Flexible fireproof cable and preparation method of heat insulation layer thereof - Google Patents
Flexible fireproof cable and preparation method of heat insulation layer thereof Download PDFInfo
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- 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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- C04B35/64—Burning or sintering processes
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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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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Abstract
本发明公开了一种柔性防火电缆，包括绞合铜丝、包覆在绞合铜丝外的云母带、挤包在云母带外的绝缘层，绝缘层外还挤包有隔热层，隔热层为矿物质复合材料；矿物质复合材料包含质量比为3:1的复合矿粉和有机硅树脂。复合矿粉包含85‑90质量份硅酸盐、2‑3质量份烧结剂和7质量份的由氧化铝、氧化钾、氧化钠、氧化钙和氧化铁组成的氧化物混合物；烧结剂按质量份由70份氧化硅、20份氧化钙和10份氧化镁组成；氧化物混合物中氧化铝、氧化钾、氧化钠、氧化钙和氧化铁质量百分含量均不小于1%。本发明还公开了该柔性防火电缆隔热层的制备方法。本发明的柔性防火电缆方便敷设，制备不受长度限制，遇火时矿物质复合材料的隔热层陶瓷化保护电缆内部。
The invention discloses a flexible fireproof cable, comprising twisted copper wires, mica tapes wrapped around the twisted copper wires, and insulating layers extruded and wrapped around the mica tapes. The thermal layer is a mineral composite material; the mineral composite material includes a composite mineral powder and a silicone resin in a mass ratio of 3:1. The composite mineral powder contains 85-90 parts by mass of silicate, 2-3 parts by mass of a sintering agent and 7 parts by mass of an oxide mixture consisting of alumina, potassium oxide, sodium oxide, calcium oxide and iron oxide; the sintering agent is by mass It consists of 70 parts of silicon oxide, 20 parts of calcium oxide and 10 parts of magnesium oxide; the mass percentage content of aluminum oxide, potassium oxide, sodium oxide, calcium oxide and iron oxide in the oxide mixture is not less than 1%. The invention also discloses a preparation method of the thermal insulation layer of the flexible fireproof cable. The flexible fireproof cable of the invention is convenient for laying, the preparation is not limited by the length, and the thermal insulation layer of the mineral composite material is ceramicized to protect the inside of the cable in case of fire.
Description
Technical Field
The invention belongs to the field of cables, and particularly relates to a flexible fireproof cable and a preparation method of a heat insulation layer of the flexible fireproof cable.
Background
The normal operation of the fire-fighting emergency equipment is very important for safely evacuating people, controlling the fire spread and reducing the fire loss when a fire occurs. Therefore, the electric distribution line of the fire-fighting emergency equipment ensures that the power supply of the fire-fighting equipment is not interrupted when a fire disaster happens, and the power supply duration is guaranteed to be very critical. The traditional fireproof cable is a cable with an outer layer made of a seamless copper pipe sheath, a middle filled magnesium oxide crystal powder serving as an insulating material and a conductor made of a single-stranded copper rod, the cable is high in investment cost of production equipment, a product cannot be produced in a large length, the product is high in price, joints are prone to being affected with damp, and the product is poor in flexibility, so that the construction difficulty is large and the construction workload is large. If the cable adopts the non-metal sheath, the sheath is damaged in fire, the fireproof performance of the cable cannot be ensured, and a large amount of smoke is generated after combustion, so that people cannot be evacuated safely.
In order to overcome the inherent defects of the traditional fireproof cable, the flexible fireproof cable is more and more accepted by customers, and is applied to basic industry and civil construction. The so-called flexible fireproof cable in the prior art is actually a derivative of the above-mentioned fireproof cable, namely, a layer of weldable and embossed copper tape is longitudinally wrapped outside the twisted conductor to serve as a cable sheath. This "fireproof cable", the structure has two fatal weak points: firstly, the insulating layer adopts the ribbon, and when the conflagration breaing out, the ribbon will become powdered in the fire in the cable, thereby this powder easily drops and leads to cable core and core, core and copper sheathing to take place to bump mutually. And secondly, the sheath is longitudinally wrapped by a copper strip for welding embossing, and the copper strip becomes hard after embossing. The first weakness results in the cable not being able to recover the copper tape softness by annealing and the post-embossing stiffening not being recoverable, which is contrary to "flexibility". Based on the current situation of fireproof cables, a flexible fireproof cable in the true sense is urgently needed.
Disclosure of Invention
The purpose of the invention is: the utility model provides a flexible fireproof cable, this cable has the flexibility, and both had been convenient for continuous large length production, can effectively block the harm of flame burning to the sinle silk again.
The technical scheme of the invention is as follows:
a flexible fireproof cable comprises a stranded copper wire, a mica tape coated outside the stranded copper wire, and an insulating layer extruded outside the mica tape, wherein a heat insulating layer is further extruded outside the insulating layer and is made of a mineral composite material; the mineral composite material comprises composite mineral powder and organic silicon resin in a mass ratio of 3: 1;
the composite mineral powder comprises 85-90 parts by mass of silicate, 2-3 parts by mass of sintering agent and 7 parts by mass of oxide mixture consisting of aluminum oxide, potassium oxide, sodium oxide, calcium oxide and ferric oxide; wherein: the sintering agent consists of 70 parts of silicon oxide, 20 parts of calcium oxide and 10 parts of magnesium oxide in parts by mass; the mass percentage content of alumina, potassium oxide, sodium oxide, calcium oxide and ferric oxide in the oxide mixture is not less than 1%.
The heat insulation layer of the flexible fireproof cable is made of a mineral composite material; the mineral composite material comprises composite mineral powder and organic silicon resin in a mass ratio of 3:1, and the composite mineral powder also contains 85-90 parts by mass of silicate and 2-3 parts by mass of sintering agent. In the cable manufacturing process, the mineral composite material is heated and crosslinked into a net structure to be fixed outside the insulating layer during extrusion, and plays a role of a framework to protect the inside of the cable during normal use of the cable; when the cable meets fire, the mineral composite material reacts rapidly at high temperature, and substances such as silicate, sintering agent, oxide mixture and the like in the composite mineral powder react rapidly at high temperature to form a hard ceramic shell which is fixed on the cable, so that the flame is prevented from continuously damaging the inside of the cable, and the cable is ensured to continuously work. Especially, the added sintering agent and the oxide mixture consisting of aluminum oxide, potassium oxide, sodium oxide, calcium oxide and iron oxide have synergistic effect, so that the ceramization temperature of the silicate is reduced, and therefore, the ceramization of the thermal insulation layer of the mineral composite material can be accelerated when encountering fire, and the interior of the cable can be protected in time. The mineral composite material and the ceramic thereof have low thermal conductivity, so that external heat can be prevented from being transmitted into the conductive wire core when a fire disaster occurs, and the current-carrying capacity of the conductive wire core is ensured not to be greatly reduced.
The flexible fireproof cable can be continuously extruded with the heat insulation layer as a normal cable during manufacturing, and the length of the prepared cable is not limited; and the thermal insulation layer of the prepared mineral composite material is flexible, can be laid conveniently, and meets the requirements of convenient construction of different use occasions.
Preferably, the thermal-insulated layer is still lapped with the glass fiber tape outward, the outside crowded package of glass fiber tape has low smoke and zero halogen sheath. The thermal insulation layer can be mechanically protected by adding the glass fiber tape. The low-smoke halogen-free sheath is used, so that the environment is more environment-friendly, and smoke is not generated when a fire disaster happens.
Preferably, the core of the stranded copper wire is not more than 0.5mm, and the fireproof cable made of the core is better in flexibility.
Preferably, the mica tape is a multilayer double-sided synthetic fire-resistant mica tape.
Preferably, the silicate is sodium silicate or calcium silicate.
The invention also provides a preparation method of the heat insulation layer of the flexible fireproof cable, which comprises the following steps:
the method comprises the following steps: preparing composite mineral powder
Weighing 85-90 parts by mass of silicate, 2-3 parts by mass of sintering agent and 7 parts by mass of oxide mixture consisting of aluminum oxide, potassium oxide, sodium oxide, calcium oxide and ferric oxide, and uniformly mixing to obtain composite mineral powder; wherein: the sintering agent consists of 70 parts of silicon oxide, 20 parts of calcium oxide and 10 parts of magnesium oxide in parts by mass; the mass percentage content of alumina, potassium oxide, sodium oxide, calcium oxide and ferric oxide in the oxide mixture is not less than 1%;
step two: kneading and extruding
Mixing organic silicon resin and organic silicon resin containing 1-2% of cross-linking agent DCP according to the mass ratio of 1: 0.7-1.5, stirring and mixing uniformly, wherein the mixing temperature is not more than 25 ℃; adding 3 times of the composite mineral powder by mass, kneading into a mineral composite material, and extruding on a silicone rubber extrusion line.
The invention has the beneficial effects that:
the heat insulation layer made of the mineral composite material for the flexible fireproof cable protects the cable, so that the defects caused by using a metal sheath are avoided, and the flexible heat insulation layer is flexible in daily use of the cable, is convenient to lay and construct and has a protection effect on the cable; when a fire disaster occurs, the heat insulation layer made of the mineral composite material can be ceramic instantly, so that the interior of the cable is protected in time. In addition, the flexible fireproof cable is not limited by length in preparation and is convenient to manufacture.
Drawings
Fig. 1 is a schematic structural diagram of a flexible fireproof cable according to the present invention.
In the figure: 1. stranding copper wires; 2. mica tapes; 3. an insulating layer; 4. a thermal insulation layer; 5. a glass fiber tape; 6. a low smoke zero halogen sheath.
Detailed Description
The present invention will be described in detail below with reference to examples and the accompanying drawings.
Fig. 1 shows a flexible fireproof cable of the present invention, which includes a stranded copper wire 1, a mica tape 2 wrapped outside the stranded copper wire 1, and an insulating layer 3 extruded outside the mica tape, wherein the insulating layer 3 is further extruded with a heat insulating layer 4, and the heat insulating layer 4 is made of a mineral composite material; the mineral composite material comprises composite mineral powder and organic silicon resin in a mass ratio of 3: 1;
the composite mineral powder comprises 85-90 parts by mass of silicate, 2-3 parts by mass of sintering agent and 7 parts by mass of oxide mixture consisting of aluminum oxide, potassium oxide, sodium oxide, calcium oxide and ferric oxide; wherein: the sintering agent consists of 70 parts of silicon oxide, 20 parts of calcium oxide and 10 parts of magnesium oxide in parts by mass; the mass percentage content of alumina, potassium oxide, sodium oxide, calcium oxide and ferric oxide in the oxide mixture is not less than 1%.
The preparation method of the heat insulation layer of the flexible fireproof cable comprises the following steps:
the method comprises the following steps: preparing composite mineral powder
Weighing 85-90 parts by mass of silicate, 2-3 parts by mass of sintering agent and 7 parts by mass of oxide mixture consisting of aluminum oxide, potassium oxide, sodium oxide, calcium oxide and ferric oxide, and uniformly mixing to obtain composite mineral powder; wherein: the sintering agent consists of 70 parts of silicon oxide, 20 parts of calcium oxide and 10 parts of magnesium oxide in parts by mass; the mass percentage content of alumina, potassium oxide, sodium oxide, calcium oxide and ferric oxide in the oxide mixture is not less than 1%.
Step two: kneading and extruding
Mixing organic silicon resin and organic silicon resin containing 1-2% of cross-linking agent DCP according to the mass ratio of 1: 0.7-1.5, and fully dissipating heat during mixing in a planetary mixer to ensure that the mixing temperature is not more than 25 ℃. Then, adding 3 times of the composite mineral powder by mass into the mixed organic silicon resin on a kneader with a vacuumizing function, kneading, extruding the mixture on a silicon rubber extrusion line to form a mineral composite material, and extruding the mineral composite material to wrap the outer part of a cable insulating layer to form a heat insulation layer when the flexible fireproof cable is prepared.
Example 1
A flexible fireproof cable is manufactured by the following method:
the method comprises the following steps: preparing composite mineral powder
1. Preparing a sintering agent: and uniformly mixing 70 parts by mass of silicon oxide powder, 20 parts by mass of calcium oxide powder and 10 parts by mass of magnesium oxide powder to obtain the sintering agent.
2. Preparing an oxide mixture: weighing 1 part of aluminum oxide, 30 parts of potassium oxide, 30 parts of sodium oxide, 30 parts of calcium oxide and 9 parts of iron oxide according to the mass parts, and uniformly mixing.
3. Preparing composite mineral powder: weighing 85 parts by mass of calcium silicate, 3 parts by mass of the prepared sintering agent and 7 parts by mass of the prepared oxide mixture, and uniformly mixing to obtain the composite mineral powder.
Step two: kneading and extruding
Mixing organic silicon resin and organic silicon resin containing 1% of crosslinking agent DCP according to the mass ratio of 1:1, mixing in a planetary mixer, fully radiating during mixing and ensuring that the mixing temperature is not more than 25 ℃. And then, adding 3 times of the composite mineral powder into the mixed organic silicon resin on a kneader with a vacuumizing function, and kneading to prepare the mineral composite material.
Step three: making cables
When the cable is manufactured, a twisted copper wire with a wire core of 0.5mm is coated with a double-sided synthetic fire-resistant mica tape; then an insulating layer is extruded, the prepared mineral composite material is extruded on the periphery of the insulating layer on a silicon rubber extrusion line to form a heat insulating layer, and the heat insulating layer is vulcanized in hot air at the temperature of 200-300 ℃. Then, still can be around having lapped the glass fiber tape outside the thermal-insulated layer, the low smoke and zero halogen sheath is crowded package to the glass fiber tape outside.
Example 2
A flexible fireproof cable is manufactured by the following method:
the method comprises the following steps: preparing composite mineral powder
1. A sintering agent was prepared in the same manner as in example 1.
2. Preparing an oxide mixture: weighing 30 parts of aluminum oxide, 1 part of potassium oxide, 9 parts of sodium oxide, 30 parts of calcium oxide and 30 parts of iron oxide according to the mass parts, and uniformly mixing.
3. Preparing composite mineral powder: weighing 90 parts by mass of sodium silicate, 2 parts by mass of the prepared sintering agent and 7 parts by mass of the prepared oxide mixture, and uniformly mixing to obtain the composite mineral powder.
Step two: kneading and extruding
Mixing the organic silicon resin and the organic silicon resin containing 2% of crosslinking agent DCP in a planetary stirrer according to the mass ratio of 1:0.7, and fully radiating heat during mixing to ensure that the mixing temperature is not more than 25 ℃. And then, adding 3 times of the composite mineral powder into the mixed organic silicon resin on a kneader with a vacuumizing function, and kneading to prepare the mineral composite material.
Step three: making cables
A flexible fire-resistant cable was fabricated by extruding the mineral composite material prepared in this example into a thermal insulation layer in the same manner as in example 1.
Example 3
A flexible fireproof cable is manufactured by the following method:
the method comprises the following steps: preparing composite mineral powder
1. A sintering agent was prepared in the same manner as in example 1.
2. Preparing an oxide mixture: weighing 30 parts of aluminum oxide, 30 parts of potassium oxide, 1 part of sodium oxide, 9 parts of calcium oxide and 30 parts of iron oxide according to the mass parts, and uniformly mixing.
3. Preparing composite mineral powder: weighing 90 parts by mass of calcium silicate, 2 parts by mass of the prepared sintering agent and 7 parts by mass of the prepared oxide mixture, and uniformly mixing to obtain the composite mineral powder.
Step two: kneading and extruding
Mixing the organic silicon resin and the organic silicon resin containing 1.5 percent of DCP (DCP) as a crosslinking agent in a mass ratio of 1:1.5 in a planetary stirrer, and fully radiating heat during mixing to ensure that the mixing temperature is not more than 25 ℃. And then, adding 3 times of the composite mineral powder into the mixed organic silicon resin on a kneader with a vacuumizing function, and kneading to prepare the mineral composite material.
Step three: making cables
A flexible fire-resistant cable was fabricated by extruding the mineral composite material prepared in this example into a thermal insulation layer in the same manner as in example 1.
Example 4
A flexible fireproof cable is manufactured by the following method:
the method comprises the following steps: preparing composite mineral powder
1. A sintering agent was prepared in the same manner as in example 1.
2. Preparing an oxide mixture: weighing 30 parts of aluminum oxide, 9 parts of potassium oxide, 30 parts of sodium oxide, 1 part of calcium oxide and 30 parts of iron oxide according to the mass parts, and uniformly mixing.
3. Preparing composite mineral powder: weighing 85 parts by mass of sodium silicate, 3 parts by mass of the prepared sintering agent and 7 parts by mass of the prepared oxide mixture, and uniformly mixing to obtain the composite mineral powder.
Step two: kneading and extruding
Mixing the organic silicon resin and the organic silicon resin containing 1.5 percent of DCP (DCP) as a crosslinking agent in a mass ratio of 1:1.2 in a planetary stirrer, and fully radiating heat during mixing to ensure that the mixing temperature is not more than 25 ℃. And then, adding 3 times of the composite mineral powder into the mixed organic silicon resin on a kneader with a vacuumizing function, and kneading to prepare the mineral composite material.
Step three: making cables
A flexible fire-resistant cable was fabricated by extruding the mineral composite material prepared in this example into a thermal insulation layer in the same manner as in example 1.
Example 5
A flexible fireproof cable is manufactured by the following method:
the method comprises the following steps: preparing composite mineral powder
1. A sintering agent was prepared in the same manner as in example 1.
2. Preparing an oxide mixture: weighing 9 parts of aluminum oxide 30 parts of potassium oxide, 30 parts of sodium oxide, 30 parts of calcium oxide and 1 part of iron oxide according to the mass parts, and uniformly mixing.
3. Preparing composite mineral powder: weighing 85 parts by mass of calcium silicate, 3 parts by mass of the prepared sintering agent and 7 parts by mass of the prepared oxide mixture, and uniformly mixing to obtain composite mineral powder.
Step two: kneading and extruding
Mixing the organic silicon resin and the organic silicon resin containing 2% of crosslinking agent DCP in a planetary stirrer according to the mass ratio of 1:0.9, and fully radiating heat during mixing to ensure that the mixing temperature is not more than 25 ℃. And then, adding 3 times of the composite mineral powder by mass into the mixed organic silicon resin on a kneader with a vacuumizing function, and kneading to prepare the mineral composite material.
Step three: making cables
A flexible fire-resistant cable was fabricated by extruding the mineral composite material prepared in this example into a thermal insulation layer in the same manner as in example 1.
And (3) testing the fireproof performance:
the flexible fireproof cables manufactured in the embodiments 1 to 5 pass the test of 90min at 950 ℃ of national standard GB/T12666-2008A after being subjected to the fireproof performance test; passes class IA 950-1000 ℃ test specified in the ministry of public Security GA 306-2007; the flexible fire-resistant cable prepared in the above examples of the invention also passed tests specified in british BS6387-1994 for class a 650 ℃ for 3h, class B750 ℃ for 3h, class C950 ℃ for 3h, while being resistant to water spray and mechanical impact during burning. Therefore, the flexible fireproof cable prepared by the invention has excellent fireproof performance. In addition, the flexible fireproof cable prepared by the method has flexible heat insulation layer and is formed by extruding on a production line, so that the flexible fireproof cable can be produced continuously, and the length of a finished product can be produced without limitation according to requirements. The flexible fireproof cable has the advantages that the bending radius can reach 7D (D is the outer diameter of the cable), the flexible fireproof cable has excellent bending performance, the end of the cable does not need to use a special terminal joint, the flexible fireproof cable is convenient to lay, is not easy to absorb moisture, and is simple in structure, small in size, convenient to manufacture and low in price.
In addition, the method of the invention can be used for extruding and wrapping the insulating layer of the flexible fireproof cable outside the insulating layer of the multi-core cable to manufacture the multi-core flexible cable, and the multi-core flexible cable can be produced according to the requirement and is not limited in the same length and can be produced continuously in large length.
It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described above may be combined with each other as long as they do not conflict with each other. In addition, the above embodiments are only some embodiments, not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010413345.5A CN111681811B (en) | 2020-05-15 | 2020-05-15 | Flexible fireproof cable and preparation method of heat insulation layer thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010413345.5A CN111681811B (en) | 2020-05-15 | 2020-05-15 | Flexible fireproof cable and preparation method of heat insulation layer thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111681811A CN111681811A (en) | 2020-09-18 |
| CN111681811B true CN111681811B (en) | 2022-05-03 |
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| CN116396695B (en) * | 2023-03-22 | 2025-05-20 | 浙江荣泰电工器材股份有限公司 | High-protection mica composite material for cable wrapping filling and preparation method thereof |
| CN120854049A (en) * | 2025-09-22 | 2025-10-28 | 辽宁金导电缆制造有限公司 | Fireproof electric wire and manufacturing process thereof |
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| WO2009109225A1 (en) * | 2008-03-05 | 2009-09-11 | Abb Research Ltd | Electrical insulation system based on silicone rubber |
| WO2012123772A1 (en) * | 2011-03-17 | 2012-09-20 | Rudolf Hensel Gmbh | Composition for a fire protection coating forming insulating layers, fire protection coating, use thereof, and production method for a fire protection coating forming insulating layers |
| CN205028693U (en) * | 2015-10-26 | 2016-02-10 | 河南胜华电缆集团有限公司 | Flexible fireproof cable of nonmetal sheath of environment -friendly |
| CN206363777U (en) * | 2016-08-10 | 2017-07-28 | 河南胜华电缆集团有限公司 | A kind of environment-friendly type fire resistant flexible midium voltage cable |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009109225A1 (en) * | 2008-03-05 | 2009-09-11 | Abb Research Ltd | Electrical insulation system based on silicone rubber |
| WO2012123772A1 (en) * | 2011-03-17 | 2012-09-20 | Rudolf Hensel Gmbh | Composition for a fire protection coating forming insulating layers, fire protection coating, use thereof, and production method for a fire protection coating forming insulating layers |
| CN205028693U (en) * | 2015-10-26 | 2016-02-10 | 河南胜华电缆集团有限公司 | Flexible fireproof cable of nonmetal sheath of environment -friendly |
| CN206363777U (en) * | 2016-08-10 | 2017-07-28 | 河南胜华电缆集团有限公司 | A kind of environment-friendly type fire resistant flexible midium voltage cable |
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| CN111681811A (en) | 2020-09-18 |
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Denomination of invention: A flexible fire-resistant cable and its preparation method for the insulation layer Granted publication date: 20220503 Pledgee: Industrial and Commercial Bank of China Limited Xinxiang Muye Branch Pledgor: HENAN SHENGHUA CABLE GROUP Co.,Ltd. Registration number: Y2025980040943 |