HC type fire-resistant cable for ships and maritime work and processing method of HC type fire-resistant cable

Abstract

The invention belongs to the technical field of power cables, and particularly relates to an HC type fire-resistant cable for ships and maritime work and a processing method. The HC type fire-resistant cable comprises a cable core, an outer fire-resistant layer, an armor layer and an outer sheath layer from inside to outside, the outer fireproof layer comprises an oxygen barrier layer and a heat insulation layer from inside to outside; the heat insulation layer is made of ceramic polyolefin and comprises EVA (Ethylene Vinyl Acetate), ceramic forming filler, a first auxiliary agent, an antioxidant and a lubricating agent; the ceramic forming filler is a mixture of rounded crystalline silicon micro powder, sepiolite fibers, low-melting-point glass powder and zinc borate; the first auxiliary agent is a mixture of low polysiloxane, perhydropolysilazane and aramid fiber powder. The HC type fire-resistant cable for ships and maritime work provided by the invention can only pass an HC fire-resistant 1100 DEG C + impact test, and has excellent oil resistance and mechanical impact resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power cables, and particularly relates to an HC fire-resistant cable for ships and offshore engineering and a processing method. BACKGROUND

[0002] With the continuous increase of the design tonnage of ships and offshore platforms, the power consumption thereof is also increased. In order to meet the requirement of high-power power transmission, the voltage grade of the main line cable is increased from 1.8 / 3kv and below to 3.6 / 6kv and above. In order to meet the fire-fighting requirement of ships and offshore platforms, the cable with a rated voltage of 3.6 / 6kv and above in special areas is required to have the HC (hydrocarbon) flame resistance performance.

[0003] The conventional fire-resistant power cable is wrapped with mica tape outside the conductor. After the cable is burned by flame, the high-temperature decomposition of the polymer material and the insulation effect of the mica tape are achieved. However, the mica tape cannot withstand the high-voltage electric field when the voltage grade of the medium-voltage cable is 3.6 / 6kv and above.

[0004] There are few reports on the technical scheme of the HC fire-resistant cable for ships and offshore engineering. A cable with halogen-free flame resistance to HC flame is disclosed in Chinese Patent No. CN203300269U. The surface of the core conductor of the cable is wrapped with a synthetic high-temperature-resistant fluorine mica tape and an extruded halogen-free insulation layer to form an insulated core. The insulated core is twisted with a filling core to form a cable core. The surface of the cable core is wrapped with a halogen-free oxygen barrier tape. The surface of the halogen-free oxygen barrier tape is extruded with a halogen-free inner lining layer. The surface of the halogen-free inner lining layer is coated with a tinned copper wire braid or a galvanized steel wire braid armor layer. The surface of the armor layer is extruded with a halogen-free flame-retardant 105℃ radiation cross-linked low-smoke halogen-free flame-retardant polyolefin insulation material inner sheath layer. The surface of the inner sheath is wrapped with a halogen-free oxygen barrier tape. The surface of the halogen-free oxygen barrier tape is extruded with a halogen-free flame-retardant cable HC flame-resistant fireproof foaming material inner sheath layer. The halogen-free flame-retardant cable HC flame-resistant fireproof foaming material provided in the technical scheme is used as a sheath. The continuous expansion and foaming ceramic hard shell structure can be formed in the flame, the requirements of low smoke, halogen-free and fire resistance are met, and the cable is effectively protected. However, the technical scheme does not involve the oil resistance and mechanical impact resistance.

[0005] A Chinese patent with publication number CN103087531A discloses a halogen-free fire-retardant cable fire-retardant foaming material and a preparation method thereof. The component weight ratio is: base material 100 phr, acid source 40-50 phr, carbonization agent 20-25 phr, foaming agent 10-15 phr, ceramic shell forming agent 80-110 phr, and lubricant 20-30 phr. The technical solution effectively foams the structure layer, which not only improves the temperature gradient inside and on the surface, but also makes the internal temperature much lower than the flame temperature, prevents the flame from damaging the inside of the cable, and prevents the outside oxygen from entering, so as to ensure that the cable can withstand 1100℃ HC high-temperature flame impact and ablation for a long time, play a role in fire resistance and heat insulation, and have excellent low smoke, halogen-free, flame-retardant and soft properties, can be extruded on the surface of the cable sheath, meet the requirements of the cable industry and oil platform cable for HC flame resistance, but the technical solution can only pass the 60min fire resistance test. SUMMARY

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

[0007] The present application is achieved by the following technical solutions:

[0008] In a first aspect, the present application provides a HC type fire-resistant cable for ships and offshore engineering, which comprises a cable core, an outer fire-resistant layer, an armor layer and an outer sheath layer from inside to outside.

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

[0010] Further, the shielding layer comprises a single-sided calcined phlogopite tape and a double-sided calcined phlogopite tape from inside to outside.

[0011] Further, the insulation layer comprises 100 parts by mass of 105℃ irradiation cross-linked low smoke halogen-free flame-retardant polyolefin insulation material and 1-5 parts by mass of color masterbatch.

[0012] Further, the cable core and the outer fire-resistant layer further comprise a filling layer.

[0013] Further, the filling layer is a PP filling rope.

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

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

[0016] Further, the low-smoke halogen-free flame-retardant polyolefin A comprises EVA, microcapsule red phosphorus, nano-magnesium hydroxide, antioxidant, lubricant.

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

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

[0019] Further, the nano-magnesium hydroxide has a particle size of 30-100nm.

[0020] Further, the thermal insulation layer is a ceramicized polyolefin, which comprises EVA, ceramic-forming filler, first additive, antioxidant, and lubricant.

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

[0022] Further, the ceramic-forming filler is a mixture of round-corner crystalline silicon powder, sepiolite fiber, low-melting-point glass powder, and zinc borate.

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

[0024] Further, the D50 of the round-corner crystalline silicon powder is 5-10µm.

[0025] Further, the fiber length of the sepiolite fiber is 100-200 mesh.

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

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

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

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

[0030] Further, the oligosiloxane is Dynasylan ® 6598.

[0031] Further, the aramid powder has a particle size of 600-1000 mesh.

[0032] In some preferred embodiments, the armor layer is tinned copper wire.

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

[0034] Further, the low-smoke halogen-free flame-retardant polyolefin B comprises 60-80 parts by mass of EVA, 130-150 parts by mass of hexagonal flaky magnesium hydroxide, 5-10 parts by mass of a second additive, 1-3 parts by mass of an antioxidant, and 2-5 parts by mass of a lubricant.

[0035] Further, the hexagonal flaky magnesium hydroxide has a D50 of 0.6-1 µm.

[0036] Further, the second additive is a mixture of a terpolymer, polytetrafluoroethylene nanoscale powder, and mullite whiskers.

[0037] Further, the terpolymer is a mixture of ethylene-methyl acrylate-glycidyl methacrylate random terpolymer and ethylene-acrylate-maleic anhydride random terpolymer at a mass ratio of 1-2:1-2.

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

[0039] Further, the ethylene-methyl acrylate-glycidyl methacrylate random terpolymer has a GAM content of 5-8 wt%.

[0040] Further, the ethylene-methyl acrylate-glycidyl methacrylate random terpolymer has a GAM content of 8 wt%.

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

[0042] Further, the ethylene-acrylate-maleic anhydride random terpolymer has a MAH content of 3.1 wt%.

[0043] Further, the polytetrafluoroethylene nanoscale powder has a molecular weight of 10000-30000 and a particle size of 1 µm.

[0044] Further, the diameter of the mullite whisker is 0.03-1 μm.

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

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

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

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

[0049] The conductor, the 105℃ irradiation crosslinking low-smoke halogen-free flame-retardant polyolefin insulating material, the color masterbatch, the PP filling layer and the tinned copper wire of the present application are not specifically limited and can be commercially available.

[0050] In the second aspect, the present application provides a processing method of the HC type fire-resistant cable for ships and marine engineering, which comprises the following steps: mixing raw materials of the oxygen barrier layer, extruding and molding the oxygen barrier layer on the cable core by using a double-screw extruder, obtaining the oxygen barrier layer; mixing raw materials of the thermal insulation layer, extruding and molding the thermal insulation layer on the oxygen barrier layer by using a double-screw extruder, obtaining the thermal insulation layer; performing armor weaving on the surface of the thermal insulation layer, obtaining the armor layer; mixing raw materials of the outer sheath layer, extruding and molding the outer sheath layer on the armor layer by using a double-screw extruder, and obtaining the HC type fire-resistant cable for ships and marine engineering.

[0051] Further, the processing method comprises the following steps: obtaining the conductor by drawing, annealing, tinning and twisting the copper rod; obtaining the shielding layer by winding the single-side calcined mica tape on the surface of the conductor and then winding the double-side calcined mica tape on the surface of the single-side calcined mica tape; mixing raw materials of the insulation layer, extruding and molding the insulation layer on the shielding layer by using a double-screw extruder, obtaining the insulation layer; filling the PP filling rope between the cable core and the outer fire-resistant layer; mixing raw materials of the oxygen barrier layer, extruding and molding the oxygen barrier layer on the cable core by using a double-screw extruder, obtaining the oxygen barrier layer; mixing raw materials of the thermal insulation layer, extruding and molding the thermal insulation layer on the oxygen barrier layer by using a double-screw extruder, obtaining the thermal insulation layer; performing armor weaving on the surface of the thermal insulation layer, obtaining the armor layer; mixing raw materials of the outer sheath layer, extruding and molding the outer sheath layer on the armor layer by using a double-screw extruder, and obtaining the HC type fire-resistant cable for ships and marine engineering.

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

[0053] 1、The heat insulation layer provided by the present application is ceramicized polyolefin, which mainly comprises EVA, ceramic filler and first additive. By adding specific ceramic filler and first additive, especially the introduction of specific low-melting glass powder, specific oligomeric siloxane, perhydro-polysilazane and aramid powder, an interpenetrating, dense, continuous and hard ceramic skeleton is formed at high temperature, which not only plays a role of heat insulation and oxygen resistance, but also avoids falling off during mechanical impact, so that the cable can pass the HC fire resistance 1100℃+ impact test for 180 minutes.

[0054] 2、The outer sheath layer provided by the present application is low-smoke halogen-free flame-retardant polyolefin B, which mainly comprises EVA, hexagonal flake magnesium hydroxide and second additive. By adding specific hexagonal flake magnesium hydroxide and second additive, the polytetrafluoroethylene nanoscale powder and mullite whisker in the second additive can not only synergistically flame-retardant with the hexagonal flake magnesium hydroxide at high temperature, but also form a physical barrier to avoid the erosion of IRM902 oil, so that the tensile strength retention rate of the fire-resistant cable after 168h test at 100℃ in IRM902 oil is still as high as 88% or more. The inventor finds that when the terpolymer is ethylene-methyl acrylate-glycidyl methacrylate random terpolymer and ethylene-acrylate-maleic anhydride random terpolymer, the fire-resistant cable not only has excellent oil resistance, but also has rigidity and toughness, so that the cable can pass the 50 times mechanical impact test.

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

[0056] 4、The HC type fire-resistant cable for ships and marine engineering provided by the present application is type certified by CCS, ABS and DNV three ship classification societies, which fills the blank of domestic high-end ship fire-resistant cable. BRIEF DESCRIPTION OF DRAWINGS

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

[0058] Figure 2 Fig. 2 is a physical diagram of the HC type fire-resistant cable for ships and marine engineering of Example 1 of the present application. DETAILED DESCRIPTION

[0059] In order to make those skilled in the art more clearly understand the technical solutions of the present application, the following examples are used for illustration. It should be pointed out that the following examples do not constitute a limitation on the scope of protection required by the present application.

[0060] The raw materials, reagents or devices used in the following examples and comparative examples, unless otherwise specified, can be obtained from conventional commercial channels or can be obtained by existing known methods. Embodiment 1

[0061] As shown in Figure 1 and Figure 2 A ship and ocean engineering HC type fire-resistant cable comprises, from inside to outside, a cable core 4, an outer fire-resistant layer 7, an armored layer 8 and an outer sheath layer 9.

[0062] The cable core comprises, from inside to outside, a conductor 1, a shielding layer 2 and an insulation layer 3.

[0063] The shielding layer 2 comprises, from inside to outside, a single-sided calcined phlogopite tape and a double-sided calcined phlogopite tape.

[0064] The insulation layer 3 comprises, by mass fraction, 100 parts of 105℃ irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin insulating material and 3 parts of color masterbatch.

[0065] The cable core 4 and the outer fire-resistant layer 7 further comprise a filling layer 10.

[0066] The filling layer 10 is a PP filling rope.

[0067] The outer fire-resistant layer 7 comprises, from inside to outside, an oxygen barrier layer 5 and a heat insulation layer 6.

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

[0069] The effective content of red phosphorus in the microcapsule red phosphorus is ≥80wt%, and the microcapsule red phosphorus is from .

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

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

[0072] The ceramic-forming filler is a mixture of round-corner crystalline silicon micropowder, sepiolite fiber, low-melting-point glass powder and zinc borate at a mass ratio of 30:25:4:1.

[0073] The round-corner crystalline silicon micropowder has a D50 of 5-10µm and is from Jiangsu Lianrui New Material Co., Ltd.

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

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

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

[0077] The oligomeric siloxane contains vinyl, propyl, and ethoxy functional groups, and the brand is Dynasylan ® 6598.

[0078] The perhydro-polysilazane is from , model: XSC-N0001.

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

[0080] The armored layer 8 is a tin-plated copper wire.

[0081] The outer sheath 9 is a low-smoke halogen-free flame-retardant polyolefin B, and the composition includes 70 parts of EVA, 140 parts of hexagonal flaky magnesium hydroxide, 6 parts of a second auxiliary agent, 2 parts of antioxidant 1010, and 4 parts of zinc stearate, by mass.

[0082] The hexagonal flaky magnesium hydroxide has a D50 of 0.6-1 µm and is from Shandong Polyke High Polymer Material Co., Ltd.

[0083] The second auxiliary agent is a mixture of a terpolymer, polytetrafluoroethylene nanoscale powder, and mullite whiskers in a mass ratio of 1:1:8.

[0084] The terpolymer is a mixture of ethylene-methyl acrylate-glycidyl methacrylate terpolymer and ethylene-acrylate-maleic anhydride random terpolymer in a mass ratio of 1:1.

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

[0086] The ethylene-acrylate-maleic anhydride random terpolymer has a MAH content of 3.1 wt% and the brand is Arkema Lotader ® 3210.

[0087] The polytetrafluoroethylene nanoscale powder has a molecular weight of 10000-30000 and a particle size of 1 µm, and is from Fuzhou Taipuda New Material Co., Ltd., model: Topda 500N.

[0088] Mullite whisker with diameter of 0.03-1 μm, from Zibo Zhongxiao New Material Technology Co., Ltd., model: ZX-MW-01.

[0089] EVA in oxygen barrier layer 5, thermal insulation layer 6 and outer sheath 9 has a VA content of 33 wt%, from Lianhong New Material Technology Co., Ltd., model: UL01833.

[0090] The processing method of the above ship and marine HC type fire-resistant cable comprises the following steps: a copper rod is drawn, annealed, tinned and twisted to obtain a conductor 1; a single-side calcined mica tape is first wound on the surface of the conductor 1, and then a double-side calcined mica tape is wound to obtain a shielding layer 2; raw materials of an insulation layer 3 are mixed, and a double-screw extruder is used to extrude and form the insulation layer 3 on the shielding layer 2; a PP filling rope 10 is filled between a cable core 4 and an outer fire-resistant layer 7; raw materials of an oxygen barrier layer 5 are mixed, and a double-screw extruder is used to extrude and form the oxygen barrier layer 5 on the cable core 4; raw materials of a thermal insulation layer 6 are mixed, and a double-screw extruder is used to extrude and form the thermal insulation layer 6 on the oxygen barrier layer 5; an armor layer 8 is obtained by armor weaving on the surface of the thermal insulation layer 6; raw materials of an outer sheath layer 9 are mixed, and a double-screw extruder is used to extrude and form the outer sheath layer 9 on the armor layer 8, thereby obtaining the HC type fire-resistant cable. Example 2

[0091] The difference between the example 1 and the example 2 is that the ceramicized polyolefin is composed of 60 parts of EVA, 110 parts of ceramic filler, 6 parts of first additive, 1.5 parts of antioxidant and 4 parts of lubricant by mass fraction; and the rest is the same. Example 3

[0092] The difference between the example 1 and the example 3 is that the composition of the low-melting-point glass powder is SiO2-B2O3-ZnO, from Guizhou Baibo New Material Technology Co., Ltd., model: BYBH806; and the rest is the same.

[0093] Comparative Example 1

[0094] The difference between the example 1 and the comparative example 1 is that the composition of the low-melting-point glass powder is SnO-P2O5-MgO, from Guizhou Baibo New Material Technology Co., Ltd., model: BYBS03; and the rest is the same.

[0095] Comparative Example 2

[0096] The difference between the example 1 and the comparative example 2 is that the perhydropolysilazane is replaced by oligomeric siloxane with the same mass, that is, the first additive is a mixture of oligomeric siloxane and aramid powder with a mass ratio of 2.2:0.8; and the rest is the same.

[0097] Comparative Example 3

[0098] The only difference between Example 1 and this example is that aramid fiber is replaced by the same amount of perhydropolysilazane, i.e. the first auxiliary agent is a mixture of oligomeric siloxane and perhydropolysilazane with a mass ratio of 2:1; the rest is the same.

[0099] Comparative Example 4

[0100] The only difference between Example 1 and this example is that the oligomeric siloxane contains vinyl and ethoxy functional groups, and the trade name is Dynasylan ® 6498; the rest is the same.

[0101] Comparative Example 5

[0102] The only difference between Example 1 and this example is that the terpolymer is an ethylene-methyl acrylate-glycidyl methacrylate random terpolymer; the rest is the same.

[0103] Comparative Example 6

[0104] The only difference between Example 1 and this example is that the ethylene-acrylate-maleic anhydride random terpolymer is replaced by the same amount of ethylene-octene copolymer grafted maleic anhydride; the rest is the same.

[0105] Comparative Example 7

[0106] The only difference between Example 1 and this example is that the mullite whisker is replaced by the same amount of magnesium borate whisker with a diameter of 1 µm, which is from Shanghai Kaishefeng Industry Co., Ltd.; the rest is the same.

[0107] Performance Test 1:

[0108] The ship and marine HC fire-resistant cables of Examples 1-3 and Comparative Examples 1-7 are subjected to the performance tests in Table 1 as follows.

[0109] Table 1 Statistics of Fire Resistance, Oil Resistance and Mechanical Impact Resistance Test Results

[0110]

[0111] Note: The HC fire-resistant 1100℃+ impact performance test is not passed, and the oil resistance IRM902 and mechanical impact 50 times test are not performed. “ / ” indicates that the performance test is not performed.

[0112] From Table 1, it can be seen that:

[0113] The ship and marine HC fire-resistant cables of Examples 1-3 not only pass the 180 min HC fire-resistant 1100℃+ impact test, but also have excellent oil resistance and mechanical impact resistance;

[0114] Compared with example 1, the ship and offshore HC type fire resistant cable of comparative example 1 cannot pass the 180min HC fire resistant 1100℃+ impact test, which shows that the specific composition of the low-melting point glass powder used in the present application improves the fire resistance;

[0115] Compared with example 1, the ship and offshore HC type fire resistant cable of comparative example 2, comparative example 3 and comparative example 4 cannot pass the 180min HC fire resistant 1100℃+ impact test, which shows that the specific composition of the first additive used in the present application improves the fire resistance;

[0116] Compared with example 1, the ship and offshore HC type fire resistant cable of comparative example 5 and comparative example 6 cannot pass the 180min HC fire resistant 1100℃+ impact test, which shows that the specific composition of the second additive used in the present application improves the fire resistance.

[0117] Compared with example 1, the ship and offshore HC type fire resistant cable of comparative example 7 cannot pass the 180min HC fire resistant 1100℃+ impact test, which shows that the specific composition of the second additive used in the present application improves the fire resistance.

[0118] Performance test 2:

[0119] The ship and offshore HC type fire resistant cable of example 1 was subjected to the performance tests shown in table 2.

[0120] Table 2: performance test results of low smoke, halogen-free and bending

[0121]

[0122] As shown in table 2, the ship and offshore HC type fire resistant cable of example 1 of the present application also has the advantages of low smoke, halogen-free and good bending.

[0123] Finally, it should be noted that the above content is only used to illustrate the technical solutions of the present application, and is not a limitation on the protection scope of the present application. Simple modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art do not deviate from the essence and scope of the technical solutions of the present application.

Claims

1. A HC fire-resistant cable for ships and offshore engineering, characterized in that: From the inside to the outside, 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 to the outside; The heat insulation layer is ceramic polyolefin, and its composition includes EVA, ceramic filler, first auxiliary agent, antioxidant and lubricant; The porcelain-forming filler is a mixture of rounded crystalline silica powder, sepiolite fiber, low-melting-point glass powder and zinc borate; The first auxiliary agent is a mixture of oligosiloxane, perhydropolysilazane and aramid powder.

2. The HC fire-resistant cable for ships and offshore engineering according to claim 1, characterized in that: The oxygen barrier layer is made of low-smoke halogen-free flame-retardant polyolefin A, and is composed of EVA, microcapsule red phosphorus, nano magnesium hydroxide, antioxidant, and lubricant.

3. The HC fire-resistant cable for ships and offshore 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 fire-resistant cable for ships and offshore engineering according to claim 1, characterized in that: The oligosiloxane contains vinyl, propyl and ethoxy functional groups.

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

8.

6. The HC fire-resistant cable for ships and offshore engineering according to claim 1, characterized in that: The outer sheath layer is made of low-smoke halogen-free flame-retardant polyolefin B, and its composition includes EVA, hexagonal magnesium hydroxide, a second auxiliary agent, an antioxidant, and a lubricant.

7. The HC fire-resistant cable for ships and offshore engineering according to claim 6, characterized in that: The second auxiliary agent is a mixture of a terpolymer, polytetrafluoroethylene nanopowder and mullite whiskers.

8. The HC fire-resistant cable for ships and offshore engineering according to claim 7, characterized in that: The terpolymer is an ethylene-methyl acrylate-glycidyl methacrylate terpolymer and an ethylene-acrylate-maleic anhydride random terpolymer in a mass ratio of 1-2:1-2.

9. The HC fire-resistant cable for ships and offshore engineering according to claim 8, characterized in that: The VA content of the EVA in the oxygen barrier layer, the heat insulation layer and the outer sheath is 25-35 wt %.

10. The method for processing the HC fire-resistant cable for ships and offshore engineering according to any one of claims 1 to 9, characterized in that: The following steps are involved: The raw materials of the oxygen barrier layer are mixed, extruded and molded by a twin-screw extruder, and coated on the cable core to obtain the oxygen barrier layer; the raw materials of the heat insulation layer are mixed, extruded and molded by a twin-screw extruder, and coated on the oxygen barrier layer to obtain the heat insulation layer; armoring is braided on the surface of the heat insulation layer to obtain the armor layer; the raw materials of the outer sheath layer are mixed, extruded and molded by a twin-screw extruder, and coated on the armor layer to obtain.

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