HC type fire resistant cable for marine and offshore and processing method

Abstract

The application belongs to the technical field of power cables, and particularly relates to a HC type fire-resistant cable for ships and marine engineering and a processing method. The HC type fire-resistant cable comprises a cable core, an outer fire-resistant layer, an armored layer and an outer sheath layer from inside to outside. The outer fire-resistant layer comprises an oxygen barrier layer and a heat insulation layer from inside to outside. The heat insulation layer is a ceramicized polyolefin, and the composition comprises EVA, ceramicized filler, a first additive, an antioxidant and a lubricant. The ceramicized filler is a mixture of rounded corner crystalline silicon powder, sepiolite fiber, low-melting point glass powder and zinc borate. The first additive is a mixture of oligomeric siloxane, perhydropolysilazane and aramid powder. The HC type fire-resistant cable for ships and marine engineering provided by the application can only pass the HC fire-resistant 1100 DEG C+ impact test, and has excellent oil resistance and mechanical impact resistance.

Description

Technical Field

[0001] This invention belongs to the field of power cable technology, specifically relating to an HC type fire-resistant cable for ships and marine engineering and its processing method. Background Technology

[0002] As the design tonnage of ships and offshore platforms continues to increase, their power consumption also increases. In order to meet the requirements of high-power power transmission, the voltage level of main line cables has been increased from 1.8 / 3kV and below to 3.6 / 6kV and above. At the same time, in order to meet the fire protection requirements of ships and offshore platforms, cables with a rated voltage of 3.6 / 6kV and above in special areas have been required to withstand HC (hydrocarbon) flames.

[0003] Conventional fire-resistant power cables have mica tape wrapped around the conductor. After the cable is burned by flames, the polymer material decomposes at high temperature, and the mica tape plays an insulating role. However, for medium-voltage cables with voltage levels above 3.6 / 6kV, the mica tape cannot withstand the high-voltage electric field.

[0004] There are few reports on existing technical solutions for HC-type fire-resistant cables used in ships and marine engineering. Chinese patent CN203300269U discloses a halogen-free flame-retardant cable resistant to HC flame combustion. The core conductor of this cable is wrapped with a synthetic high-temperature resistant fluorophlogopite tape and extruded with a halogen-free insulation layer to form an insulated core. The insulated core and a filler core are twisted together to form the cable core. A halogen-free oxygen-barrier tape is wrapped around the cable core, and a halogen-free inner liner is extruded over the halogen-free oxygen-barrier tape. The halogen-free inner liner is covered with a tinned copper wire braided or galvanized steel wire braided armor layer, and the armor layer is extruded with… The inner sheath of the cable is made of halogen-free flame-retardant 105℃ irradiated cross-linked low-smoke halogen-free flame-retardant polyolefin insulation material. The surface of the inner sheath is wrapped with halogen-free oxygen barrier tape, and the surface of the halogen-free oxygen barrier tape is extruded with an inner sheath layer of halogen-free flame-retardant cable refractory foam material resistant to HC flame combustion. The halogen-free flame-retardant cable refractory foam material resistant to HC flame combustion provided by this technical solution can form a hard shell structure of continuous expanding foamed ceramic in the flame, achieving the requirements of low smoke, halogen-free, and flame retardant, thereby achieving effective protection for the cable. However, this technical solution does not address oil resistance and mechanical impact resistance.

[0005] Chinese patent CN103087531A discloses a halogen-free flame-retardant cable fire-retardant foam material and its preparation method. The component weight ratio is: substrate 100 phr, acid source 40-50 phr, charring agent 20-25 phr, foaming agent 10-15 phr, ceramic shelling agent 80-110 phr, and lubricant 20-30 phr. This technical solution's effective foamed structure layer not only increases the temperature gradient between the interior and surface, making the internal temperature much lower than the flame temperature, preventing flame damage to the cable's interior, but also isolates external oxygen from entering, ensuring the cable can withstand the impact and erosion of 1100℃ HC high-temperature flame for a long time, playing a role in fire resistance and heat insulation. It also has excellent low-smoke, halogen-free, flame-retardant, and flexible properties, and can be extruded onto the surface of the cable sheath, meeting the requirements of the cable industry and oil platform cables for resistance to HC flame combustion. However, this technical solution can only pass a fire resistance time of 60 minutes. Summary of the Invention

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art and to provide at least one beneficial alternative. To this end, the present invention provides an HC-type fire-resistant cable for marine and offshore engineering applications and a processing method thereof. The HC-type fire-resistant cable for marine and offshore engineering applications provided by the present invention can pass the HC fire-resistant 1100℃+ impact test and has excellent oil resistance and mechanical impact resistance.

[0007] This invention is achieved through the following technical solution:

[0008] In a first aspect, the present invention provides a fire-resistant cable of type HC for ships and marine engineering, comprising, from the inside out, a cable core, an outer fire-resistant layer, an armor layer and an outer sheath layer.

[0009] In some preferred embodiments, the cable core comprises, from the inside out, a conductor, a shielding layer, and an insulation layer.

[0010] Furthermore, the shielding layer comprises, from the inside out, a single-sided calcined phlogopite mica tape and a double-sided calcined phlogopite mica tape.

[0011] Furthermore, the insulation layer, by weight, comprises 100 parts of 105°C irradiated cross-linked low-smoke halogen-free flame-retardant polyolefin insulation material and 1-5 parts of color masterbatch.

[0012] Furthermore, a filler layer is also included between the cable core and the outer fire-resistant layer.

[0013] Furthermore, the filling layer is PP filling rope.

[0014] In some preferred embodiments, the outer fire-resistant layer comprises an oxygen barrier layer and a heat insulation layer from the inside out.

[0015] Furthermore, the oxygen barrier layer is a low-smoke, halogen-free flame-retardant polyolefin A.

[0016] Furthermore, the low-smoke halogen-free flame-retardant polyolefin A comprises EVA, microcapsule red phosphorus, nano magnesium hydroxide, antioxidants, and lubricants.

[0017] Furthermore, the low-smoke halogen-free flame-retardant polyolefin A, by weight, comprises 60-80 parts EVA, 5-10 parts microencapsulated red phosphorus, 110-130 parts nano magnesium hydroxide, 1-3 parts antioxidant, and 2-5 parts lubricant.

[0018] Furthermore, the effective content of red phosphorus in the microcapsule red phosphorus is ≥80wt%.

[0019] Furthermore, the particle size of the nano-magnesium hydroxide is 30-100 nm.

[0020] Furthermore, the heat insulation layer is a ceramicized polyolefin, comprising EVA, ceramic filler, first additive, antioxidant, and lubricant.

[0021] Furthermore, the ceramicized polyolefin, by mass, comprises 60-80 parts EVA, 70-120 parts ceramic filler, 5-10 parts first additive, 1-3 parts antioxidant, and 2-5 parts lubricant.

[0022] Furthermore, the ceramic filler is a mixture of rounded crystalline silica micropowder, sepiolite fiber, low melting point glass powder, and zinc borate.

[0023] Furthermore, the mass ratio of the rounded-corner crystalline silica micropowder, sepiolite fiber, low-melting-point glass powder, and zinc borate is 20-40:10-30:3-7:1.

[0024] Furthermore, the D50 of the rounded-corner crystalline silica micropowder is 5-10µm.

[0025] Furthermore, the sepiolite fiber has a fiber length of 100-200 mesh.

[0026] Furthermore, the low-melting-point glass powder is composed of SiO2-B2O3-Al2O3 or SiO2-B2O3-ZnO.

[0027] Furthermore, the first additive is a mixture of oligomeric siloxane, perhydropolysilazane, and aramid powder.

[0028] Furthermore, the mass ratio of the oligomeric siloxane, the perhydropolysilazane, and the aramid powder is 1-3:0.1-0.3:0.5-0.8.

[0029] Furthermore, the oligomeric siloxane contains vinyl, propyl, and ethoxy functional groups.

[0030] Furthermore, the oligomeric siloxane is Dynasylan. ® 6598.

[0031] Furthermore, the particle size of the aramid powder is 600-1000 mesh.

[0032] In some preferred embodiments, the armor layer is tin-plated copper wire.

[0033] In some preferred embodiments, the outer sheath layer is a low-smoke, halogen-free flame-retardant polyolefin B, which comprises EVA, hexagonal magnesium hydroxide flakes, a second additive, an antioxidant, and a lubricant.

[0034] Furthermore, the low-smoke halogen-free flame-retardant polyolefin B, by weight, comprises 60-80 parts EVA, 130-150 parts hexagonal magnesium hydroxide, 5-10 parts secondary additive, 1-3 parts antioxidant, and 2-5 parts lubricant.

[0035] Furthermore, the D50 of the hexagonal magnesium hydroxide is 0.6-1µm.

[0036] Furthermore, the second additive is a mixture of terpolymer, polytetrafluoroethylene nanoparticles, and mullite whiskers.

[0037] Furthermore, the terpolymer is an ethylene-methyl acrylate-glycidyl methacrylate terpolymer and an ethylene-acrylate-maleic anhydride terpolymer with a mass ratio of 1-2:1-2.

[0038] Furthermore, the mass ratio of the terpolymer, polytetrafluoroethylene nanoparticles, and mullite whiskers is 1-2:1-2:5-10.

[0039] Furthermore, the GAM content of the ethylene-methyl acrylate-glycidyl methacrylate terpolymer is 5-8 wt%.

[0040] Furthermore, the GAM content of the ethylene-methyl acrylate-glycidyl methacrylate terpolymer is 8 wt%.

[0041] Furthermore, the MAH content of the ethylene-acrylate-maleic anhydride random terpolymer is 3-3.5 wt%.

[0042] Furthermore, the MAH content of the ethylene-acrylate-maleic anhydride random terpolymer is 3.1 wt%.

[0043] Furthermore, the polytetrafluoroethylene nanoparticles have a molecular weight of 10,000-30,000 and a particle size of 1 μm.

[0044] Furthermore, the mullite whiskers have a diameter of 0.03-1 μm.

[0045] In some preferred embodiments, the VA content of EVA in the oxygen barrier layer, heat insulation layer, and outer sheath is 25-35 wt%.

[0046] Furthermore, the VA content of EVA is 33 wt%.

[0047] In some preferred embodiments, the antioxidants in the oxygen barrier layer, the heat insulation layer, and the outer sheath are all selected from at least one of antioxidant 1010 and antioxidant 168.

[0048] In some preferred embodiments, the lubricant in the oxygen barrier layer, the heat insulation layer, and the outer sheath is selected from at least one of polyethylene wax and zinc stearate.

[0049] The present invention does not specifically limit the above-mentioned conductor, 105°C irradiated cross-linked low smoke halogen-free flame retardant polyolefin insulation material, color masterbatch, PP filler layer, and tin-plated copper wire, which can be derived from commercially available sources.

[0050] Secondly, the present invention provides a processing method for HC type fire-resistant cables for ships and marine engineering, comprising the following steps: mixing the raw materials for the oxygen barrier layer, extruding and molding them onto the cable core using a twin-screw extruder to obtain the oxygen barrier layer; mixing the raw materials for the heat insulation layer, extruding and molding them onto the oxygen barrier layer using a twin-screw extruder to obtain the heat insulation layer; performing armor braiding on the surface of the heat insulation layer to obtain the armor layer; mixing the raw materials for the outer sheath layer, extruding and molding them onto the armor layer using a twin-screw extruder to obtain the final product.

[0051] Further, the processing method includes the following steps: the copper rod is drawn, annealed, tin-plated, and stranded to obtain a conductor; a single-sided calcined phlogopite tape is first wrapped around the surface of the conductor, and then a double-sided calcined phlogopite tape is wrapped around it to obtain a shielding layer; the raw materials for the insulation layer are mixed and extruded using a twin-screw extruder to coat the shielding layer, thus obtaining an insulation layer; PP filler rope is filled between the cable core and the outer fire-resistant layer; the raw materials for the oxygen barrier layer are mixed and extruded using a twin-screw extruder to coat the cable core, thus obtaining an oxygen barrier layer; the raw materials for the heat insulation layer are mixed and extruded using a twin-screw extruder to coat the oxygen barrier layer, thus obtaining a heat insulation layer; armor braiding is performed on the surface of the heat insulation layer to obtain an armor layer; the raw materials for the outer sheath layer are mixed and extruded using a twin-screw extruder to coat the armor layer, thus obtaining the final product.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. The heat insulation layer provided by this invention is a ceramicized polyolefin, which mainly consists of EVA, ceramic filler and first additive. By adding specific ceramic filler and first additive, especially specific low melting point glass powder, specific oligomeric siloxane, perhydropolysilazane and aramid powder, an interpenetrating, dense, continuous and hard ceramic skeleton is formed at high temperature. It not only plays the role of heat insulation and oxygen barrier, but also can prevent it from falling off during mechanical impact, so that the cable can pass the 180min HC fire resistance 1100℃+ impact test.

[0054] 2. The outer sheath layer provided by this invention is a low-smoke, halogen-free flame-retardant polyolefin B, which mainly consists of EVA, hexagonal magnesium hydroxide, and a second additive. By adding specific hexagonal magnesium hydroxide and the second additive, the polytetrafluoroethylene nanoparticles and mullite whiskers in the second additive can not only synergistically retard flame with the hexagonal magnesium hydroxide at high temperatures, but also form a physical barrier to prevent the corrosion of IRM902 oil. This allows the fire-resistant cable to retain a tensile strength of 88% or higher after a 168-hour test in IRM902 oil at 100°C. The inventors have found that when the terpolymer is an ethylene-methyl acrylate-glycidyl methacrylate terpolymer or an ethylene-acrylate-maleic anhydride terpolymer, the fire-resistant cable not only has excellent oil resistance, but also rigidity and toughness, enabling the cable to pass 50 mechanical impact tests.

[0055] 3. The HC-type fire-resistant cable for ships and marine engineering provided by this invention simultaneously meets the requirements of low smoke (transmittance ≥80%) and halogen-free (HCl≤5mg / g).

[0056] 4. The HC-type fire-resistant cable for ships and marine engineering provided by this invention has passed the type certification of three classification societies: CCS, ABS, and DNV, filling the gap in high-end marine fire-resistant cables in China. Attached Figure Description

[0057] Figure 1 This is a structural schematic diagram of the HC type fire-resistant cable for ships and marine engineering of the present invention;

[0058] Figure 2 This is a physical image of the HC type fire-resistant cable for ships and marine engineering according to Embodiment 1 of the present invention. Detailed Implementation

[0059] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0060] Unless otherwise specified, the raw materials, reagents or apparatus used in the following examples and comparative examples are available from conventional commercial sources or can be obtained by existing known methods. Example 1

[0061] like Figure 1 and Figure 2 As shown, a type HC fire-resistant cable for ships and marine engineering includes, from the inside out, a cable core 4, an outer fire-resistant layer 7, an armor layer 8, and an outer sheath layer 9.

[0062] The cable core consists of conductor 1, shielding layer 2, and insulation layer 3 from the inside out.

[0063] The shielding layer 2 consists of a single-sided calcined phlogopite mica tape and a double-sided calcined phlogopite mica tape from the inside out.

[0064] Insulation layer 3, by weight, comprises 100 parts of 105°C irradiated cross-linked low-smoke halogen-free flame-retardant polyolefin insulation material and 3 parts of color masterbatch.

[0065] A filler layer 10 is also included between the cable core 4 and the outer fire-resistant layer 7.

[0066] The filling layer 10 is made of PP filling rope.

[0067] The outer fire-resistant layer 7 consists of an oxygen barrier layer 5 and a heat insulation layer 6 from the inside out.

[0068] The oxygen barrier layer 5 is a low-smoke, halogen-free flame-retardant polyolefin A, which, by mass, consists of 60 parts EVA, 8 parts microcapsule red phosphorus, 120 parts nano magnesium hydroxide, 1.5 parts antioxidant 1010, and 3 parts zinc stearate.

[0069] The effective content of red phosphorus in microencapsulated red phosphorus is ≥80wt%, derived from .

[0070] The nano-magnesium hydroxide has a particle size of 100nm and is sourced from Xuancheng Jingrui New Materials Co., Ltd., model number: VK-MHT02.

[0071] The insulation layer 6 is a ceramicized polyolefin, which, by mass, comprises 70 parts EVA, 100 parts ceramic filler, 8 parts first additive, 2 parts antioxidant 1010, and 3 parts zinc stearate.

[0072] The ceramic filler is a mixture of rounded crystalline silica micropowder, sepiolite fiber, low melting point glass powder and zinc borate in a mass ratio of 30:25:4:1.

[0073] The rounded-corner crystalline silica micropowder has a D50 of 5-10µm and is sourced from Jiangsu Lianrui New Materials Co., Ltd.

[0074] The sepiolite fiber has a fiber length of 200 mesh and comes from Lingshou County Jiashuo Building Materials Processing Co., Ltd.

[0075] The low melting point glass powder is composed of SiO2-B2O3-Al2O3, sourced from Guizhou Baibo New Material Technology Co., Ltd., model number: BYBH019.

[0076] The first auxiliary agent is a mixture of oligomeric siloxane, perhydropolysilazane and aramid powder in a mass ratio of 2:0.2:0.8.

[0077] Oligomeric siloxanes contain vinyl, propyl, and ethoxy functional groups, and are branded as Dynasylan. ® 6598.

[0078] All-hydropolysilazane originates from Model: XSC-N0001.

[0079] The aramid powder has a particle size of 800 mesh and originates from... .

[0080] The 8th armor layer is made of tin-plated copper wire.

[0081] The outer sheath layer 9 is a low-smoke, halogen-free flame-retardant polyolefin B, which, by mass, consists of 70 parts EVA, 140 parts hexagonal magnesium hydroxide, 6 parts secondary additive, 2 parts antioxidant 1010, and 4 parts zinc stearate.

[0082] The D50 of the hexagonal sheet-shaped magnesium hydroxide is 0.6-1µm, and it is sourced from Shandong Juke Polymer Materials Co., Ltd.

[0083] The second additive is a mixture of a terpolymer, polytetrafluoroethylene nanoparticles, and mullite whiskers in a mass ratio of 1:1:8.

[0084] The terpolymers are ethylene-methyl acrylate-glycidyl methacrylate terpolymers and ethylene-acrylate-maleic anhydride terpolymers with a mass ratio of 1:1.

[0085] The GAM content of the ethylene-methyl acrylate-glycidyl methacrylate terpolymer random copolymer is 8 wt%, and the brand name is Arkema Lotader. ® AX8700.

[0086] The MAH content of the ethylene-acrylate-maleic anhydride random terpolymer is 3.1 wt%, and the brand name is ArkemaLotader. ® 3210.

[0087] The polytetrafluoroethylene nanoparticles have a molecular weight of 10,000-30,000 and a particle size of 1μm. They are sourced from Fuzhou Topda New Materials Co., Ltd., and the model number is Topda 500N.

[0088] The mullite whiskers have a diameter of 0.03-1μm and are sourced from Zibo Zhongxiao New Material Technology Co., Ltd., model number: ZX-MW-01.

[0089] The EVA content in oxygen barrier layer 5, heat insulation layer 6, and outer sheath layer 9 is 33wt%, sourced from Lianhong New Material Technology Co., Ltd., model number: UL01833.

[0090] The processing method of the above-mentioned HC type fire-resistant cable for ships and marine engineering includes the following steps: copper rods are drawn, annealed, tin-plated, and stranded to obtain conductor 1; single-sided calcined phlogopite tape is first wrapped around the surface of conductor 1, and then double-sided calcined phlogopite tape is wrapped around it to obtain shielding layer 2; the raw materials of insulation layer 3 are mixed and extruded using a twin-screw extruder to coat the shielding layer 2 to obtain insulation layer 3; PP filler rope is filled between cable core 4 and outer fire-resistant layer 7; the raw materials of oxygen barrier layer 5 are mixed and extruded using a twin-screw extruder to coat the cable core 4 to obtain oxygen barrier layer 5; the raw materials of heat insulation layer 6 are mixed and extruded using a twin-screw extruder to coat the oxygen barrier layer 5 to obtain heat insulation layer 6; armor braiding is performed on the surface of heat insulation layer 6 to obtain armor layer 8; the raw materials of outer sheath layer 9 are mixed and extruded using a twin-screw extruder to coat the armor layer 8 to obtain the final product. Example 2

[0091] The only difference from Example 1 is that the ceramicized polyolefin, by weight, comprises 60 parts EVA, 110 parts ceramic filler, 6 parts first additive, 1.5 parts antioxidant, and 4 parts lubricant; all other components are the same. Example 3

[0092] The only difference from Example 1 is that the low melting point glass powder is composed of SiO2-B2O3-ZnO, sourced from Guizhou Baibo New Material Technology Co., Ltd., model number: BYBH806; all other components are the same.

[0093] Comparative Example 1

[0094] The only difference from Example 1 is that the low melting point glass powder is composed of SnO-P2O5-MgO, sourced from Guizhou Baibo New Material Technology Co., Ltd., model number: BYBS03; all other components are the same.

[0095] Comparative Example 2

[0096] The only difference from Example 1 is that the perhydropolysilazane is replaced with an equal mass of oligopolysiloxane, that is, the first additive is a mixture of oligopolysiloxane and aramid powder in a mass ratio of 2.2:0.8; all else is the same.

[0097] Comparative Example 3

[0098] The only difference from Example 1 is that the aramid powder is replaced with an equal mass of perhydropolysilazane, that is, the first additive is a mixture of oligomeric siloxane and perhydropolysilazane in a mass ratio of 2:1; all other aspects are the same.

[0099] Comparative Example 4

[0100] The only difference from Example 1 is that the oligomeric siloxane contains vinyl and ethoxy functional groups, and its brand name is Dynasylan. ® 6498; the rest are the same.

[0101] Comparative Example 5

[0102] The only difference from Example 1 is that the terpolymer is an ethylene-methyl acrylate-glycidyl methacrylate terpolymer; all other aspects are the same.

[0103] Comparative Example 6

[0104] The only difference from Example 1 is that the ethylene-acrylate-maleic anhydride random terpolymer is replaced with an equal mass of ethylene-octene copolymer grafted with maleic anhydride; all other aspects are the same.

[0105] Comparative Example 7

[0106] The only difference from Example 1 is that the mullite whiskers are replaced with magnesium borate whiskers of equal mass, with a diameter of 1µm, sourced from Shanghai Kaishefeng Industrial Co., Ltd., otherwise they are the same.

[0107] Performance Test 1:

[0108] The performance tests of the HC-type fire-resistant cables for ships and marine engineering in Examples 1-3 and Comparative Examples 1-7 are shown in Table 1 below.

[0109] Table 1. Statistics of test results for fire resistance, oil resistance and mechanical impact performance.

[0110]

[0111] Note: Products that fail the HC fire resistance 1100℃+ impact performance test will not be tested for oil resistance IRM902 and mechanical impact 50 times. " / " indicates that the performance test was not performed.

[0112] As can be seen from Table 1:

[0113] The HC-type fire-resistant cables for ships and marine engineering in Examples 1-3 not only pass the 180-minute HC fire-resistant 1100℃+ impact test, but also have excellent oil resistance and mechanical impact resistance.

[0114] Compared with Example 1, the HC type fire-resistant cable for ships and marine engineering in Comparative Example 1 could not pass the 180-minute HC fire resistance 1100℃+ impact test, indicating that the present invention uses specific medium and low melting point glass powder composition to improve its fire resistance performance.

[0115] Compared with Example 1, the HC type fire-resistant cables for ships and marine engineering of Comparative Examples 2, 3 and 4 could not pass the 180min HC fire resistance 1100℃+ impact test, indicating that the present invention uses a specific first additive composition, which improves its fire resistance.

[0116] Compared with Example 1, the HC-type fire-resistant cables for ships and marine engineering in Comparative Examples 5 and 6 could not achieve a tensile strength retention rate of 80% after the oil resistance IRM902 test, and short-circuited after 50 mechanical impacts. This indicates that the present invention uses a specific second additive to improve its oil resistance and mechanical impact resistance.

[0117] Compared with Example 1, the HC type fire-resistant cable for ships and marine engineering in Comparative Example 7 could not pass the 180-minute HC fire resistance 1100℃+ impact test, indicating that the use of specific mullite whiskers in the second additive of the present invention improves its fire resistance.

[0118] Performance Test 2:

[0119] The performance tests of the HC type fire-resistant cable for ships and marine engineering in Example 1 are shown in Table 2 below.

[0120] Table 2. Statistics of performance test results for low smoke, halogen-free, and flexural properties.

[0121]

[0122] As can be seen from Table 2, the HC-type fire-resistant cable for ships and marine engineering of Embodiment 1 of the present invention also has the advantages of low smoke, halogen-free and good flexibility.

[0123] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A type HC fire-resistant cable for ships and marine engineering, characterized in that, From the inside out, it includes the cable core, outer fire-resistant layer, armor layer, and outer sheath layer; The outer fire-resistant layer includes an oxygen barrier layer and a heat insulation layer from the inside out; The heat insulation layer is a ceramicized polyolefin, which includes EVA, ceramic filler, first additive, antioxidant, and lubricant. The ceramic filler is a mixture of rounded crystalline silica micro powder, sepiolite fiber, low melting point glass powder and zinc borate; The first additive is a mixture of oligopolysiloxane, perhydropolysilazane, and aramid powder; the oligopolysiloxane contains vinyl, propyl, and ethoxy functional groups; The outer sheath layer is a low-smoke halogen-free flame-retardant polyolefin B, which includes EVA, hexagonal magnesium hydroxide, a second additive, an antioxidant, and a lubricant. The second additive is a mixture of terpolymer, polytetrafluoroethylene nanoparticles and mullite whiskers; the terpolymer is an ethylene-methyl acrylate-glycidyl methacrylate terpolymer and an ethylene-acrylate-maleic anhydride terpolymer with a mass ratio of 1-2:1-2.

2. The HC type fire-resistant cable for ships and marine engineering as described in claim 1, characterized in that, The oxygen barrier layer is a low-smoke, halogen-free flame-retardant polyolefin A, which includes EVA, microcapsule red phosphorus, nano magnesium hydroxide, antioxidants, and lubricants.

3. The HC type fire-resistant cable for ships and marine engineering according to claim 2, characterized in that, The low-melting-point glass powder is composed of SiO2-B2O3-Al2O3 or SiO2-B2O3-ZnO.

4. The HC type fire-resistant cable for ships and marine engineering according to claim 1, characterized in that, The mass ratio of the rounded-corner crystalline silica micropowder, sepiolite fiber, low-melting-point glass powder, and zinc borate is 20-40:10-30:3-7:1; the mass ratio of the oligomeric siloxane, perhydropolysilazane, and aramid powder is 1-3:0.1-0.3:0.5-0.

8.

5. The HC type fire-resistant cable for ships and marine engineering according to claim 1, characterized in that, The VA content of EVA in the oxygen barrier layer, heat insulation layer, and outer sheath is 25-35 wt%.

6. The processing method of the HC type fire-resistant cable for ships and marine engineering as described in any one of claims 1-5, characterized in that, Includes the following steps: The raw materials for the oxygen barrier layer are mixed and extruded onto the cable core using a twin-screw extruder to obtain the oxygen barrier layer; the raw materials for the heat insulation layer are mixed and extruded onto the oxygen barrier layer using a twin-screw extruder to obtain the heat insulation layer; armor braiding is performed on the surface of the heat insulation layer to obtain the armor layer; the raw materials for the outer sheath layer are mixed and extruded onto the armor layer using a twin-screw extruder to obtain the final product.

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