Multilayer composite fireproof cable and production process thereof

Abstract

The invention relates to the technical field of cable materials, and particularly discloses a multi-layer composite fireproof cable and a production process thereof. The multi-layer composite fireproof cable comprises a cable core, a first-layer fireproof processing unit, a second-layer fireproof processing unit, a third-layer fireproof processing unit, a fourth-layer fireproof material and a high-performance protective belt material, the raw materials of the first-layer fireproof treatment unit, the second-layer fireproof treatment unit and the third-layer fireproof treatment unit respectively comprise an intumescent fireproof coating, an alkali-free glass fiber tape and an alkali-free glass fiber rope; through the synergistic effect of the multi-layer structure and multiple fireproof components, the fireproof performance of the cable can be effectively improved, and the effective fireproof time of the cable is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable materials, in particular to a multi-layer composite fireproof cable and a production process thereof. BACKGROUND

[0002] The traditional mineral insulated cable is a cable using annealed copper as a conductor, dense magnesium oxide as insulation, and annealed copper tube as a sheath. The dense magnesium oxide insulation is mainly formed by sintering magnesium oxide powder into blocks and then extruding or adding magnesium oxide powder through high-frequency vibration. The sintering forming method of magnesium oxide powder has high equipment investment, poor control of insulation performance, and difficulty in controlling the insulation eccentricity, resulting in high scrap rate and high failure rate during user use.

[0003] Due to the many shortcomings of magnesium oxide fireproof cables, flexible fireproof cables have emerged in China. The flexible fireproof cable is a conductor that is insulated by wrapping mica tape, then cabling, and then extruding an aluminum hydroxide and magnesium hydroxide mixture mineral fireproof layer outside the cable core.

[0004] However, the aluminum hydroxide and magnesium hydroxide mixture mineral fireproof layer is in a soft state during extrusion, and the force during traction and take-up in the extrusion process can easily cause the fireproof layer to be flattened, eccentric, and damaged. In addition, the fireproof layer is also prone to flattening, eccentricity, and damage during the unwinding and metal sleeve pressure stress in the metal sleeve process, thereby causing the fireproof performance to fail. SUMMARY

[0005] In order to improve the fireproof performance of existing cables, the present application provides a multi-layer composite fireproof cable and a production process thereof.

[0006] In a first aspect, the present application provides a multi-layer composite fireproof cable, which adopts the following technical solution: A multi-layer composite fireproof cable, the multi-layer composite fireproof cable comprising a cable core, a first layer fireproof treatment unit, a second layer fireproof treatment unit, a third layer fireproof treatment unit, a fourth layer fireproof material, and a high-performance protective tape material; the first layer fireproof treatment unit, the second layer fireproof treatment unit, and the third layer fireproof treatment unit all include expanded fireproof paint, alkali-free glass fiber tape, and alkali-free glass fiber rope.

[0007] By adopting the above technical scheme, the multi-layer fireproof treatment unit is compounded, and each layer of the fireproof treatment unit comprises the intumescent fireproof paint, the alkali-free glass fiber belt and the alkali-free glass fiber rope raw material, so that the near-cable core protection of the fireproof paint and the protection gradient of the fiber belt winding density and the rope filling are formed, multi-layer positions are formed, the phenomenon that the cable loses the protection performance due to the damage of the traditional single protection layer is reduced, and the stability and the durability of the cable fireproof performance are prolonged; meanwhile, the high-performance protection belt material is combined on the outside of the cable, which can resist construction collision, long-term extrusion, damp corrosion and the like, the fireproof structure is prevented from losing effectiveness due to mechanical damage, and the durability of the cable fireproof structure is prolonged.

[0008] The intumescent fireproof paint can expand and carbonize under the action of flame or high temperature to form a non-combustible honeycomb foam-shaped carbon layer with a thickness of several tens of times or even several hundred times of the original thickness, and the fireproof module can cut off the heating of the external fire source to the base material, thereby playing a fire-retardant role.

[0009] The alkali-free glass fiber belt and the alkali-free glass fiber rope can be used as the carrier skeleton of the fireproof paint to avoid the paint from falling off before the fire and collapsing after expansion, and to ensure the structural stability of the fireproof material. The alkali-free glass fiber belt and the alkali-free glass fiber rope have a certain heat insulation property, slow down the heat transfer to the cable core, and improve the fireproof effect and stability of the cable through double effects.

[0010] Preferably, the fourth layer of fireproof material is the intumescent fireproof paint.

[0011] Preferably, the intumescent fireproof paint comprises the following raw materials in parts by weight: water 220-250 parts, wetting agent 1-2 parts, dispersing agent 3-8 parts, ethylene glycol 10-14 parts, cellulose 0.5-1.5 parts, defoaming agent 1-2 parts, titanium white 40-60 parts, foaming catalyst 280-320 parts, foaming agent 60-80 parts, carbonizing agent 50-70 parts, whitening agent 0.5-1.5 parts, film-forming emulsion 300-400 parts, dodecanol 15-18 parts, multifunctional additive 1-2 parts, preservative 1-2 parts, thickening agent 5-8 parts, and leveling agent 1-3 parts.

[0012] By adopting the above technical scheme, when the coating is heated, the film-forming emulsion is first softened and melted, causing the softening and plasticization of the entire coating. At this time, the foaming agent reaches the decomposition temperature, releases non-combustible gas, and makes the coating expand into a foam layer. At the same time, the foaming catalyst decomposes the molten viscous body of phosphoric acid and polyphosphoric acid, which acts on the foam layer, causing the dehydration and carbonization reaction of the hydroxyl-containing organic matter in the coating. When the foam reaches the maximum volume, the foam is solidified and carbonized, the naturally porous sponge-like carbonized layer is shaped, the components cooperate with each other, and the foam has a high foaming efficiency. The appropriate proportion of various fireproof components is adopted to achieve proper cooperation, improve the continuous fireproof protection effect of the fireproof paint, increase the fire-retardant effect of the coating, and prolong the effective fireproof time of the coating.

[0013] Preferably, the foaming catalyst is ammonium polyphosphate, the foaming agent is melamine, and the charring agent is pentaerythritol.

[0014] Preferably, the film-forming emulsion is a complex of a styrene-acrylic emulsion and an acrylate elastomer emulsion, and the mass ratio of the styrene-acrylic emulsion to the acrylate elastomer emulsion is (2-2.5):1.

[0015] By adopting the above technical solution, the melting temperature of the film-forming emulsion in the protective coating is properly matched with the decomposition temperature of the foaming agent and the foaming carbonization temperature, which is beneficial to improve the sustained fireproofing effect of the fireproofing coating, increase the fire-retardant effect of the coating, and prolong the effective fireproofing time of the coating.

[0016] Preferably, the high-performance protective tape material is one of a ceramicized silicone rubber composite tape and a high-silica glass fiber tape.

[0017] By adopting the above technical solution, the ceramicized silicone rubber composite tape and the high-silica glass fiber tape as the outermost protective material can help the cable maintain good flexibility at room temperature and have fireproofing effect at high temperature.

[0018] Preferably, the cable core comprises, from the inside to the outside, a conductor, a fire-resistant layer, and an insulating layer.

[0019] Preferably, the fire-resistant layer is made of ceramic fiber cotton, and the insulating layer is made of cross-linked polyethylene.

[0020] By adopting the above technical solution, the ceramic fiber cotton can tightly wrap the multiple-stranded conductor without any wrapping gap, avoiding the flame from contacting the surface of the conductor through the gap, while not affecting the bending flexibility of the cable. Compared with conventional polyethylene, cross-linked polyethylene has more durable temperature resistance, can withstand the load heating of the cable during operation, and is resistant to ultraviolet rays and chemical corrosion, thereby improving the durability of the cable material.

[0021] In a second aspect, the present application provides a production process of a multi-layer composite fireproofing cable machine, which adopts the following technical solution: The production process of the multi-layer composite fireproof cable machine comprises the following specific steps: coating a layer of intumescent fireproof paint on the cable core, then wrapping the cable core with alkali-free glass fiber tape and alkali-free glass fiber rope to form a first layer of fireproof treatment unit, coating a layer of intumescent fireproof paint on the surface of the first layer of fireproof treatment unit, then wrapping the cable core with alkali-free glass fiber tape and alkali-free glass fiber rope to form a second layer of fireproof treatment unit, coating a layer of intumescent fireproof paint on the surface of the second layer of fireproof treatment unit, then wrapping the cable core with alkali-free glass fiber tape and alkali-free glass fiber rope to form a third layer of fireproof treatment unit, coating a fourth layer of fireproof material on the surface of the third layer of fireproof treatment unit, and finally wrapping a layer of high-performance protective tape material on the outermost layer, and then pulling and collecting the cable to obtain the multi-layer composite fireproof cable.

[0022] By adopting the above technical scheme, the multi-layer structure and the synergistic effect of the multiple fireproof components can effectively improve the fireproof performance of the cable and prolong the effective fireproof time of the cable.

[0023] Preferably, the preparation method of the cable core comprises the following specific steps: twisting not less than two conductors, wrapping a layer of fire-resistant layer on the twisted conductors, and then extruding a layer of insulating layer on the fire-resistant layer to obtain the cable core.

[0024] In summary, the present application has the following beneficial effects: 1. Since the present application adopts multi-layer fireproof treatment units, each layer of fireproof treatment unit comprises intumescent fireproof paint, alkali-free glass fiber tape and alkali-free glass fiber rope, and a high-performance protective tape material is combined on the outer side of the cable, the stability and durability of the fireproof performance of the cable are prolonged by combining the multi-layer structure and multiple components.

[0025] 2. In the present application, the melting temperature of the film-forming emulsion in the protective coating is properly matched with the decomposition temperature of the foaming agent and the foaming carbonization temperature, which improves the continuous fireproof protection effect of the fireproof coating, increases the fire retardant effect of the cable and prolongs the effective fireproof time of the cable. The ceramicized silicone rubber composite tape and the high-silica glass fiber tape as the outermost protective material can promote the cable to maintain good flexibility at room temperature and have fireproof effect at high temperature. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in combination with the embodiments.

[0027] All raw materials in the embodiments can be obtained through market purchase. EMBODIMENT

[0028] Embodiment 1 The embodiment provides a kind of multilayer composite fireproof cable, from inside to outside, it is cable core, first layer fireproof processing unit, second layer fireproof processing unit, third layer fireproof processing unit, fourth layer fireproof material, high-performance protective tape material in turn.The raw materials of first layer fireproof processing unit, second layer fireproof processing unit, third layer fireproof processing unit include intumescent fire retardant coating, alkali-free glass fiber tape, alkali-free glass fiber rope.The fourth layer fireproof material is intumescent fire retardant coating, and the high-performance protective tape material is high-silica glass fiber tape, and the silica content in high-silica glass fiber tape is 97%.

[0029] Intumescent fire retardant coating includes the following raw materials by weight: water 235 kg, wetting agent 1.5 kg, dispersant 5 kg, ethylene glycol 12 kg, cellulose 1 kg, defoamer 1.5 kg, titanium dioxide 50 kg, foaming catalyst 300 kg, foaming agent 70 kg, carbon-forming agent 60 kg, whitening agent 1 kg, film-forming emulsion 350 kg, dodecanol 17 kg, multifunctional additive 1.5 kg, preservative 1.5 kg, thickener 6 kg, leveling agent 2 kg. Among them, the wetting agent is selected as type X-405, the dispersant is selected as SN-5040, the cellulose is selected as 32000S, the defoamer is selected as NXZ, the foaming catalyst is ammonium polyphosphate, the foaming agent is melamine, the carbon-forming agent is pentaerythritol, the titanium dioxide is selected as R-258, the film-forming emulsion is a composite of benzene and propylene emulsion 816 and acrylate elastomer emulsion 963, the mass ratio of benzene and propylene emulsion 816 and acrylate elastomer emulsion 963 is 2.5:1, the multifunctional additive is selected as AMP-95, the preservative is selected as 102S, the thickener is selected as TRM203, and the leveling agent is selected as TRM003; the thickness of the intumescent fire retardant coating is 5 mm.

[0030] The cable core includes a conductor, a fire-resistant layer and an insulating layer from inside to outside, the conductor is a copper wire, the raw material of the fire-resistant layer is ceramic fiber cotton, and the raw material of the insulating layer is crosslinked polyethylene; the number average molecular weight of the crosslinked polyethylene is 1 million, and the thickness of the insulating layer is 2 mm.

[0031] The production process of the multilayer composite fireproof cable machine includes the following specific steps: S1: mix water, wetting agent, dispersant, ethylene glycol, cellulose, defoamer, titanium dioxide, foaming catalyst, foaming agent, carbon-forming agent, whitening agent, film-forming emulsion, dodecanol, multifunctional additive, preservative, thickener and leveling agent, and stir uniformly to form intumescent fire retardant coating.

[0032] S2: 5 conductors are stranded, then wrapped with a layer of refractory layer, and then wrapped with a layer of insulating layer outside the refractory layer to form a cable core; a layer of intumescent fire retardant coating is coated outside the cable core, then a layer of no-alkali glass fiber tape and a layer of no-alkali glass fiber rope are wrapped in sequence to form a first fireproof treatment unit, a layer of intumescent fire retardant coating is coated on the surface of the first fireproof treatment unit, then a layer of no-alkali glass fiber tape and a layer of no-alkali glass fiber rope are wrapped in sequence to form a second fireproof treatment unit, a layer of intumescent fire retardant coating is coated on the surface of the second fireproof treatment unit, then a layer of no-alkali glass fiber tape and a layer of no-alkali glass fiber rope are wrapped in sequence to form a third fireproof treatment unit, a fourth layer of fireproof material is coated on the surface of the third fireproof treatment unit, and finally a layer of high-performance protective tape material is wrapped on the outermost layer, and then the cable is collected and arranged to obtain the multi-layer composite fireproof cable.

[0033] Example 2 The difference between Example 2 and Example 1 is that the intumescent fire retardant coating comprises the following raw materials by weight: water 220 kg, wetting agent 2 kg, dispersing agent 3 kg, ethylene glycol 10 kg, cellulose 1.5 kg, defoaming agent 1 kg, titanium white 40 kg, foaming catalyst 280 kg, foaming agent 60 kg, carbon forming agent 70 kg, whitening agent 0.5 kg, film-forming emulsion 300 kg, dodecanol fat 15 kg, multifunctional additive 1 kg, preservative 2 kg, thickening agent 8 kg, and leveling agent 1 kg.

[0034] Example 3 The difference between Example 3 and Example 1 is that the intumescent fire retardant coating comprises the following raw materials by weight: water 250 kg, wetting agent 1 kg, dispersing agent 8 kg, ethylene glycol 14 kg, cellulose 0.5 kg, defoaming agent 2 kg, titanium white 60 kg, foaming catalyst 320 kg, foaming agent 80 kg, carbon forming agent 50 kg, whitening agent 1.5 kg, film-forming emulsion 400 kg, dodecanol fat 18 kg, multifunctional additive 2 kg, preservative 1 kg, thickening agent 5 kg, and leveling agent 3 kg.

[0035] Example 4 The difference between Example 4 and Example 1 is that the mass ratio of styrene-acrylic emulsion and acrylate elastomer emulsion in the film-forming emulsion is 2:1.

[0036] Example 5 The difference between Example 5 and Example 1 is that the high-performance protective tape material is a ceramicized silicone rubber composite tape, and the ceramicized silicone rubber composite tape is Andike ceramicized silicone rubber composite tape CS-230.

[0037] Example 6 The difference between Example 6 and Example 1 is that the cable core comprises the conductors and the insulating layer from inside to outside.

[0038] The production process of the multi-layer composite fireproof cable machine comprises the following specific steps: S1: water, wetting agent, dispersing agent, ethylene glycol, cellulose, defoaming agent, titanium white, foaming catalyst, foaming agent, carbon forming agent, whitening agent, film forming emulsion, dodecanol fat, multifunctional additive, preservative, thickening agent and leveling agent are mixed and stirred uniformly to form an intumescent fireproof coating.

[0039] S2: five conductors are stranded and an insulating layer is extruded around the conductors to form a cable core. An intumescent fireproof coating is applied on the cable core, and then a layer of alkali-free glass fiber tape and a layer of alkali-free glass fiber rope are wound around the cable core to form a first layer of fireproof treatment unit. An intumescent fireproof coating is applied on the surface of the first layer of fireproof treatment unit, and then a layer of alkali-free glass fiber tape and a layer of alkali-free glass fiber rope are wound around the first layer of fireproof treatment unit to form a second layer of fireproof treatment unit. An intumescent fireproof coating is applied on the surface of the second layer of fireproof treatment unit, and then a layer of alkali-free glass fiber tape and a layer of alkali-free glass fiber rope are wound around the second layer of fireproof treatment unit to form a third layer of fireproof treatment unit. A fourth layer of fireproof material is applied on the surface of the third layer of fireproof treatment unit, and finally a layer of high-performance protective tape material is wound around the outermost layer to form a multi-layer composite fireproof cable.

[0040] Example 7 Example 7 is different from example 1 in that the cable core insulating layer is made of polyethylene with a number average molecular weight of 100,000.

[0041] Comparative example Comparative example 1 Comparative example 1 is different from example 1 in that the multi-layer composite fireproof cable comprises a cable core, a first layer of fireproof treatment unit, a second layer of fireproof treatment unit, a third layer of fireproof treatment unit and a fourth layer of fireproof material.

[0042] The production process of the multi-layer composite fireproof cable machine comprises the following specific steps: S1: water, wetting agent, dispersing agent, ethylene glycol, cellulose, defoaming agent, titanium white, foaming catalyst, foaming agent, carbon forming agent, whitening agent, film forming emulsion, dodecanol fat, multifunctional additive, preservative, thickening agent and leveling agent are mixed and stirred uniformly to form an intumescent fireproof coating.

[0043] S2: 5 conductors are stranded, then wrapped with a layer of refractory layer, and then wrapped with a layer of insulation layer outside the refractory layer to form a cable core; a layer of intumescent fire retardant coating is coated outside the cable core, then a layer of no-alkali glass fiber tape and a layer of no-alkali glass fiber rope are wrapped in sequence to form a first fireproof treatment unit, a layer of intumescent fire retardant coating is coated on the surface of the first fireproof treatment unit, then a layer of no-alkali glass fiber tape and a layer of no-alkali glass fiber rope are wrapped in sequence to form a second fireproof treatment unit, a layer of intumescent fire retardant coating is coated on the surface of the second fireproof treatment unit, then a layer of no-alkali glass fiber tape and a layer of no-alkali glass fiber rope are wrapped in sequence to form a third fireproof treatment unit, a fourth layer of fireproof material is coated on the surface of the third fireproof treatment unit, and finally a layer of high-performance protective tape material is wrapped on the outermost layer, and the multi-layer composite fireproof cable is obtained after collecting and arranging the wires.

[0044] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the raw materials of the first fireproof treatment unit, the second fireproof treatment unit and the third fireproof treatment unit in the multi-layer composite fireproof cable are all intumescent fire retardant coating.

[0045] The production process of the multi-layer composite fireproof cable machine includes the following specific steps: S1: water, wetting agent, dispersing agent, ethylene glycol, cellulose, defoaming agent, titanium dioxide, foaming catalyst, foaming agent, carbon forming agent, whitening agent, film-forming emulsion, dodecanol, multifunctional additive, preservative, thickening agent and leveling agent are mixed and stirred uniformly to form an intumescent fire retardant coating.

[0046] S2: 5 conductors are stranded, then wrapped with a layer of refractory layer, and then wrapped with a layer of insulation layer outside the refractory layer to form a cable core; a layer of intumescent fire retardant coating is coated outside the cable core, then a layer of intumescent fire retardant coating is coated on the surface of the first fireproof treatment unit, then a layer of intumescent fire retardant coating is coated on the surface of the second fireproof treatment unit, then a layer of intumescent fire retardant coating is coated on the surface of the third fireproof treatment unit, and finally a layer of high-performance protective tape material is wrapped on the outermost layer, and the multi-layer composite fireproof cable is obtained after collecting and arranging the wires.

[0047] Performance detection test The multi-layer composite fireproof cable provided by Examples 1-7 and Comparative Examples 1-2 of the present application is subjected to the following performance detection, and the specific detection results are shown in Table 1.

[0048] Detection method I. Flame retardant performance test According to the standard of GB / T 19216.11-2003 "Line integrity experiment of cable or optical cable under flame conditions", the continuous power supply time of the multi-layer composite fireproof cable prepared in the present application under the flame temperature of 800℃ is detected.

[0049] II. Elongation at break The elongation at break test is performed according to GB / T2951.11-2008 "Cables and optical cables - Insulation and sheath materials - General test methods - Part 11: General test methods - Measurement of thickness and outer dimensions - Mechanical property tests", and 100 mm of the prepared multi-layer composite fireproof cable is taken as a test piece. A self-tightening chuck is selected for the tension testing machine. When the test piece is stretched to break, the percentage of the increment of the marked distance to the marked distance of the un-stretched test piece is the elongation at break %. Table 1: Performance test result data table According to the performance test results, the multi-layer structure and the appropriate combination of various components can increase the flame-retardant effect of the cable and prolong the effective fireproof time of the cable.

[0050] According to the comparison between Comparative Example 1-2 and Example 1, no high-performance protective tape material is used outside the cable in Comparative Example 1. According to the performance test results, the fireproof performance of the prepared multi-layer composite fireproof cable is reduced, and the elongation at break is also reduced. This further illustrates that the combination of high-performance protective tape material outside the cable can resist construction collision, long-term extrusion, moisture corrosion, etc., avoid the failure of the fireproof structure due to mechanical damage, and prolong the durability of the cable fireproof structure. In Comparative Example 2, each layer of fireproof treatment unit only uses intumescent fireproof paint. Although there is still a certain fireproof effect, the durability of the fireproof of the prepared multi-layer composite fireproof cable is greatly reduced. This further illustrates that the synergistic combination of alkali-free glass fiber tape, alkali-free glass fiber rope, and intumescent fireproof paint can promote the firm and stable combination of the cable fireproof paint on the surface of the cable core, thereby prolonging the durability of the cable fireproof.

[0051] According to the comparison between Example 6 and Example 1, the fire-resistant layer is not used in the cable core raw material of Example 6. According to the performance test results, the fireproof durability of the cable is also reduced. This further illustrates that the combination of a layer of fire-resistant layer on the outer surface of the cable core can provide the last line of defense when the flame burns and delay the spread of the flame.

[0052] According to the comparison between Example 7 and Example 1, the insulating layer of the cable core in Example 7 uses polyethylene. According to the performance test results, the insulation performance of the cable is slightly reduced. This further illustrates that the use of cross-linked polyethylene as the insulating layer of the cable core can not only protect the cable core insulation but also have high-temperature resistance compared to polyethylene.

[0053] The specific embodiments are only an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A multi-layer composite fire resistant cable, characterized in that, The multi-layer composite fireproof cable comprises a cable core, a first layer of fireproof treatment unit, a second layer of fireproof treatment unit, a third layer of fireproof treatment unit, a fourth layer of fireproof material and a high-performance protective tape material.

2. The multi-layer composite fire resistant cable of claim 1, wherein, The fourth layer of fireproof material is an intumescent fire retardant coating.

3. The multi-layer composite fire resistant cable of claim 2, wherein, The intumescent fire retardant coating comprises the following raw materials by weight: water 220-250 parts, wetting agent 1-2 parts, dispersing agent 3-8 parts, ethylene glycol 10-14 parts, cellulose 0.5-1.5 parts, defoaming agent 1-2 parts, titanium white 40-60 parts, foaming catalyst 280-320 parts, foaming agent 60-80 parts, carbonization agent 50-70 parts, whitening agent 0.5-1.5 parts, film-forming emulsion 300-400 parts, dodecanol ester 15-18 parts, multifunctional additive 1-2 parts, preservative 1-2 parts, thickening agent 5-8 parts, and leveling agent 1-3 parts.

4. The multi-layer composite fire resistant cable of claim 3, wherein, The foaming catalyst is ammonium polyphosphate, the foaming agent is melamine, and the carbonization agent is pentaerythritol.

5. The multi-layer composite fire resistant cable of claim 4, wherein, The film-forming emulsion is a composite of benzene propylene emulsion and acrylate elastic emulsion, and the mass ratio of the benzene propylene emulsion to the acrylate elastic emulsion is (2-2.5):

1.

6. The multi-layer composite fire resistant cable of claim 1, wherein, The high-performance protective tape material is one of a ceramicized silicone rubber composite tape and a high-silica glass fiber tape.

7. The multi-layer composite fire resistant cable of claim 1, wherein, The cable core comprises a conductor, a fire-resistant layer and an insulation layer from inside to outside.

8. The multi-layer composite fire resistant cable of claim 7, wherein, The raw material of the fire-resistant layer is ceramic fiber cotton, and the raw material of the insulation layer is cross-linked polyethylene.

9. A process for the production of a multilayer composite fire resistant cable machine as claimed in any one of claims 1 to 8, characterized in that, The method comprises the following specific steps: coating an intumescent fire retardant coating on the cable core, then winding the intumescent fire retardant coating with alkali-free glass fiber tape and alkali-free glass fiber rope to form the first layer of fireproof treatment unit, coating an intumescent fire retardant coating on the surface of the first layer of fireproof treatment unit, then winding the intumescent fire retardant coating with alkali-free glass fiber tape and alkali-free glass fiber rope to form the second layer of fireproof treatment unit, coating an intumescent fire retardant coating on the surface of the second layer of fireproof treatment unit, then winding the intumescent fire retardant coating with alkali-free glass fiber tape and alkali-free glass fiber rope to form the third layer of fireproof treatment unit, coating the fourth layer of fireproof material on the surface of the third layer of fireproof treatment unit, and finally winding a layer of high-performance protective tape material on the outermost layer, collecting and arranging the wires to obtain the multi-layer composite fireproof cable.

10. The process for the production of a multilayer composite fire resistant cable machine according to claim 9, characterized in that, The preparation method of the cable core comprises the following specific steps: twisting not less than two conductors, winding a layer of fire-resistant layer on the twisted conductors, and then extruding a layer of insulation layer on the fire-resistant layer to obtain the cable core.

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