CN116554587A

CN116554587A - Cable for ship as well as preparation method and application thereof

Info

Publication number: CN116554587A
Application number: CN202310567541.1A
Authority: CN
Inventors: 凌胡鑫; 李斌; 凌国桢; 周大亮; 张燕
Original assignee: Jiangsu Shangshang Cable Group Co Ltd; Jiangsu Shangshang Cable Group New Material Co Ltd
Current assignee: Jiangsu Shangshang Cable Group Co Ltd; Jiangsu Shangshang Cable Group New Material Co Ltd
Priority date: 2023-05-19
Filing date: 2023-05-19
Publication date: 2023-08-08

Abstract

The invention relates to a cable for a ship, and a preparation method and application thereof, wherein the cable comprises a conductor layer, a cabling layer, an armor layer and a sheath layer which are sequentially arranged from inside to outside; the preparation raw materials of the sheath layer comprise the following components in parts by weight: 25-40 parts of ethylene-vinyl acetate copolymer, 20-35 parts of polyethylene, 15-25 parts of elastomer, 4-6 parts of filler and 0.5-239.5 parts of auxiliary agent. The cable disclosed by the invention can realize a large outer diameter, has excellent mechanical property, heat aging resistance, mineral oil resistance and tearing resistance, and is high in product crosslinking degree, and the sheath layer of the cable is simple in process and strong in operability.

Description

Cable for ship as well as preparation method and application thereof

Technical Field

The invention relates to the technical field of cables, in particular to a cable for a ship, a preparation method and application thereof.

Background

The existing power cable for ships is mostly used for power transmission of low-voltage alternating current and direct current end equipment, and is currently propelled towards medium-voltage power.

CN207938376U discloses a medium voltage fire-resistant portable flexible cable, which is provided with 3 power lines, each power line comprises a soft structure copper conductor, a conductor shielding layer, an insulating shielding layer and a metal shielding layer from inside to outside, 3 power lines and filling materials are wrapped by wrapping tape, and an inner liner, an armor and an outer sheath are sequentially arranged outside the wrapping tape. The conductor shielding layer is methyl vinyl silicone rubber, the insulating layer is ceramic silicone rubber, the outer sheath is halogen-free flame-retardant polyolefin, and the filler is flame-retardant polypropylene reticular fiber.

CN211208040U discloses a signal cable for light vessels, which is provided with a plurality of conductor cores, wherein an isolating layer, a shielding layer and an outer sheath layer are sequentially coated outside the plurality of conductor cores, an insulating layer is coated outside each conductor core, and fillers are arranged among the plurality of conductor cores; each conductor wire core is a copper-clad aluminum wire core, and the shielding layer is a copper-clad aluminum wire braided shielding layer. The outer sheath layer and the insulating layer are both low-smoke halogen-free irradiation crosslinking polyolefin layers.

In the prior art, the marine cable has the problems of breakdown of insulation, cracking of a sheath, charge accumulation and the like after irradiation crosslinking of the cable, which are caused by the great improvement of voltage class (the chief breakthrough is raised to 26/35 kV), and the quality problems of braiding, cage lifting or sheath emptying and the like easily occur in the vulcanization process of the cable with large outer diameter.

In summary, it is important to develop a cable that overcomes the above problems.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a cable for a ship, a preparation method and application thereof, wherein the cable can realize large outer diameter, has excellent mechanical property, heat aging resistance, mineral oil resistance and tearing resistance, has high crosslinking degree, has a simple sheath layer process and strong operability, and solves the problems of breakdown of insulation, sheath cracking, charge accumulation and the like after irradiation crosslinking of the cable, which are caused by the large improvement of voltage level, and the quality problems of braiding cage or sheath void and the like in the vulcanization process of the cable with large outer diameter.

To achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a cable for a vessel, the cable comprising, from inside to outside, a conductor layer, a cabling layer, an armor layer and a sheath layer, which are arranged in sequence;

the preparation raw materials of the sheath layer comprise the following components in parts by weight:

in the present invention, the weight parts of the ethylene-vinyl acetate copolymer are 25 to 40 parts, for example, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, etc.

The polyethylene is 20 to 35 parts by weight, for example 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, etc.

The elastomer is 15 to 25 parts by weight, for example 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, etc.

The filler is 4-6 parts by weight, for example 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts, 5 parts, 5.2 parts, 5.4 parts, 5.6 parts, 5.8 parts, etc.

The auxiliary agent is 0.5-239.5 parts by weight, such as 1 part, 5 parts, 10 parts, 50 parts, 100 parts, 150 parts, 200 parts, etc.

In the invention, the cable has excellent mechanical property, heat aging resistance, mineral oil resistance and tearing resistance, the crosslinking degree of the product is high, and the sheath layer of the cable has simple process and strong operability. Compared with the conventional materials, the raw materials of the sheath layer have the advantages of simple processing technology, high production efficiency and excellent performance.

Preferably, the conductor layer comprises at least 1 (e.g., 2, 4, 6, etc.) conductive elements.

Preferably, the conductive element comprises a conductor containing a wrap, a conductor shielding layer, an insulating shielding layer and a metal shielding layer which are sequentially arranged from inside to outside.

Preferably, a filler is also arranged between the conductor layer and the cabling layer.

In the invention, the outer diameter of the cable can be more than 70mm or less than 70 mm.

Exemplary (voltage class 8.7/15kV, specification 3X 50):

the nominal diameter of the wrapped conductor is 10.5mm.

The nominal thickness of the conductor shield is 0.8mm.

The nominal thickness of the insulating layer is 4.5mm.

The nominal thickness of the insulating shield is 0.8mm.

The nominal diameter of the braided filaments of the metal shield is 0.25mm.

The nominal diameter of the cabling was 55.6mm.

The braided filaments of the armor layer have a nominal diameter of 0.4mm.

The nominal thickness of the sheath layer was 2.7mm.

In the invention, the materials of the conductor containing the wrapping, the conductor shielding layer, the insulating shielding layer, the metal shielding layer, the cabling layer and the armor layer are arranged according to the requirements.

Illustratively, the wrapped conductor is formed from tin-plated copper wire by bundling, stranding, and wrapping a semiconductive tape.

Illustratively, the raw materials of the conductor shielding layer include a combination of conductor-wrapped semiconductive tape and extruded semiconductive material.

The insulating layer comprises any one or a combination of at least two of ethylene propylene rubber or similar insulating compounds (EPR or EPDM).

The insulating shield layer includes a non-metallic semiconductive layer, which may be an extruded semiconductive material and/or a wrapped semiconductive tape, and a metallic layer.

The metallic shielding layer comprises any one or a combination of at least two of metal braiding wires, concentric layers of metal wires or one or more metal tape windings.

The cabling layer comprises wrapping and/or extrusion.

The armor layer comprises any one or a combination of at least two of a wire or a bimetallic strip.

Preferably, the elastomer comprises any one or a combination of at least two of a polyethylene octene co-elastomer (POE), a vinyl polymer grafted polyether polyol (POP), or a thermoplastic vulcanizate (TPV), where typical but non-limiting combinations include: a combination of a polyethylene octene co-elastomer and a vinyl polymer grafted polyether polyol, a combination of a vinyl polymer grafted polyether polyol and a thermoplastic vulcanizate, a combination of a polyethylene octene co-elastomer, a vinyl polymer grafted polyether polyol and a thermoplastic vulcanizate, and the like.

Preferably, the filler comprises a masterbatch.

Preferably, the auxiliary agent comprises any one or a combination of at least two of a compatibilizer, flame retardant, nanosynergist, antioxidant, lubricant, coupling agent, or cross-linking agent, wherein typical but non-limiting combinations include: a combination of a compatilizer, a flame retardant and a nano synergist, a combination of an antioxidant, a lubricant, a coupling agent and a cross-linking agent, a combination of a compatilizer, a flame retardant, a nano synergist, an antioxidant, a lubricant, a coupling agent and a cross-linking agent, and the like.

In the invention, the specific type of the auxiliary agent can be selected according to the needs.

Illustratively, the compatibilizing agent comprises any one or a combination of at least two of maleic anhydride grafted polyethylene PE, maleic anhydride grafted POE, or maleic anhydride grafted ethylene propylene diene monomer EPDM, wherein typical but non-limiting combinations include: a combination of maleic anhydride grafted PE and maleic anhydride grafted POE, a combination of maleic anhydride grafted POE and maleic anhydride grafted EPDM, a combination of maleic anhydride grafted PE, maleic anhydride grafted POE and maleic anhydride grafted EPDM, and the like.

The nanosynergist comprises any one or a combination of at least two of nano montmorillonite, nano kaolin or graphene, wherein typical but non-limiting combinations include: a combination of nano montmorillonite and nano kaolin, a combination of nano kaolin and graphene, a combination of nano montmorillonite, nano kaolin and graphene, and the like.

The antioxidants include any one or a combination of at least two of antioxidant 1010, antioxidant 168, or antioxidant 1545, wherein typical but non-limiting combinations include: a combination of antioxidant 1010 and antioxidant 168, a combination of antioxidant 168 and antioxidant 1545, a combination of antioxidant 1010, antioxidant 168 and antioxidant 1545, and the like.

The lubricant comprises any one or a combination of at least two of polyethylene wax, calcium stearate or oleamide, wherein typical but non-limiting combinations include: a combination of polyethylene wax and calcium stearate, a combination of calcium stearate and oleamide, a combination of polyethylene wax, calcium stearate and oleamide, and the like.

The coupling agent comprises any one or a combination of at least two of gamma-aminopropyl triethoxysilane (KH 550), gamma-methacryloxypropyl trimethoxysilane (KH 570) or vinyltris (b-methoxyethoxy) silane (a 172), wherein typical but non-limiting combinations include: a combination of KH550 and KH570, a combination of KH570 and A172, a combination of KH550, KH570 and A172, etc.

The crosslinker comprises any one or a combination of at least two of triallyl isocyanate (TAIC), trimethylolpropane trimethacrylate (TMPTMA) or trimethylol propyl methacrylate (TMPTA), wherein typical but non-limiting combinations include: combinations of TAIC and TMPTMA, combinations of TMPTMA and TMPTA, combinations of TAIC, TMPTMA and TMPTA, and the like.

Preferably, the compatibilizing agent is present in an amount of 5 to 10 parts by weight, such as 6 parts, 7 parts, 8 parts, 9 parts, etc.

Preferably, the flame retardant comprises any one or a combination of at least two of aluminum hydroxide, magnesium hydroxide or nitrogen-phosphorus based compounded flame retardant masterbatch, wherein typical but non-limiting combinations include: a combination of aluminum hydroxide and magnesium hydroxide, a combination of magnesium hydroxide and flame retardant master batch, and the like, a combination of aluminum hydroxide, magnesium hydroxide and flame retardant master batch, and the like.

Preferably, the weight parts of the flame retardant are 5 to 210 parts, for example 10 parts, 20 parts, 40 parts, 60 parts, 80 parts, 100 parts, 120 parts, 140 parts, 160 parts, 180 parts, 200 parts, etc.

Preferably, the aluminum hydroxide is 120 to 150 parts by weight, for example 125 parts, 130 parts, 135 parts, 140 parts, 145 parts, etc.

Preferably, the magnesium hydroxide is 20-50 parts by weight, such as 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, etc.

Preferably, the flame retardant masterbatch is 5-10 parts by weight, e.g., 6 parts, 7 parts, 8 parts, 9 parts, etc.

Preferably, the weight fraction of the nanosynergist is 5-10 parts, e.g. 6 parts, 7 parts, 8 parts, 9 parts, etc.

Preferably, the antioxidant is 1-3 parts by weight, for example 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, etc.

Preferably, the lubricant is 1-3 parts by weight, such as 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, etc.

Preferably, the coupling agent is present in an amount of 0.5 to 1.5 parts by weight, for example 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.4 parts, etc.

Preferably, the cross-linking agent is present in an amount of 1 to 2 parts by weight, such as 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, etc.

In a second aspect, the present invention provides a method for preparing the cable according to the first aspect, the method comprising the steps of:

and arranging the conductor layer, the cabling layer, the armor layer and the sheath layer in a layer-by-layer manner to obtain the cable.

Illustratively, the preparation method specifically comprises the following steps: the cable is obtained by sequentially arranging a conductor shielding layer, an insulating shielding layer and a metal shielding layer on the surface of a conductor containing a wrapping bag to form conductive elements, bundling three conductive elements to form a conductor layer, arranging a cable layer, an armor layer and a sheath layer, and arranging a filler between the cable layer and the conductor layer.

Preferably, the method for setting the sheath layer includes: mixing the preparation raw materials of the sheath layer, extruding and molding the surface of the armor layer, and then carrying out irradiation or vulcanization to obtain the sheath layer.

Preferably, the temperature of the kneading is 105 to 115 ℃, for example 106 ℃, 107 ℃, 108 ℃, 109 ℃, 110 ℃, 111 ℃, 112 ℃, 113 ℃, 114 ℃, etc.

Preferably, the mixing time is 6-8min, e.g., 6.5min, 7min, 7.5min, etc.

Preferably, the outer diameter of the cable is less than or equal to 70mm (for example, 65mm, 60mm, 55mm, 50mm and the like), and the sheath layer is arranged in an irradiation mode.

In the invention, the sheath layer is arranged in an irradiation mode when the outer diameter of the cable is less than or equal to 70mm, and the reason is that the device of a flow production irradiation line is limited, and the maximum outer diameter of conventional irradiation is within 70 mm.

Preferably, the energy of the irradiation is 1.8-2.1MeV, e.g. 1.8MeV, 1.9MeV, 2.0MeV, 2.1MeV, etc.

In the invention, the reason that the irradiation energy is in the preferred range is that by adopting the irradiation principle of high energy and low dosage, the crosslinking degree and uniformity of irradiation are obviously improved, and the problems of breakdown of insulation, sheath cracking, charge accumulation and the like of the cable after the cable is irradiated and crosslinked due to the great improvement of the voltage level are solved. The low dosage of the composition can cause insufficient crosslinking, and indexes such as hot extension, oil immersion and the like are not in accordance with the requirements; the risk of sheath cracking, cable breakdown and the like can be caused by the excessively high energy.

Preferably, the irradiation is performed in 4-8 passes, such as 5, 6, 7, etc.

Preferably, the beam current of the irradiation is 10-30mA, for example 12mA, 14mA, 16mA, 18mA, 20mA, 22mA, 24mA, 26mA, 28mA, etc.

Preferably, the irradiation occurs at a speed of 7-10m/min, e.g. 7.5m/min, 8m/min, 8.5m/min, 9m/min, 9.5m/min, etc.

In the invention, the reason that the irradiation speed is in the preferred range is that the irradiation dosage of the cable can be perfectly synchronous with the rotation of the cable in the irradiation process, so that the sheath can be uniformly irradiated, and the irradiation overmuch, the sheath cracking and the like can be caused by the lower irradiation speed; the occurrence speed is too high, which can cause insufficient irradiation.

Preferably, the cable has an outer diameter of > 70mm (e.g., 75mm, 80mm, 85mm, 90mm, etc.), and the jacket layer is provided by vulcanization.

In the prior art, when a large-outer-diameter medium-voltage power cable is irradiated, the conditions that a transmission system cannot pull the cable to perform normal transmission, the cable is damaged due to quality accidents such as clamping equipment pumping and charge accumulation and the like caused by overlarge outer diameter, and the cable is broken due to overlarge local irradiation dose, so that sheath cracking, insulation breakdown and the like occur in the voltage application process are easily caused.

Preferably, the sulfided water level is less than or equal to 25%, e.g., 20%, 15%, 10%, 5%, etc.

In the present invention, the reason why the vulcanized water level is within the preferable range is as follows: the low water level vulcanization process is adopted, and the quality problems that the braiding cage or the sheath is empty and the like easily occur in the vulcanization process of the cable with the large outer diameter are solved.

Preferably, the air pressure for said vulcanisation is 7-12bar, for example 7bar, 8bar, 10bar, 11bar, 12bar, etc.

Preferably, the speed of vulcanization is 2-5m/min, such as 2.5m/min, 3m/min, 3.5m/min, 4m/min, 4.5m/min, etc.

Preferably, the host temperature of the vulcanization is 50-80 ℃, e.g., 55 ℃, 60 ℃, 65 ℃, 70 ℃, 75 ℃, etc.

Preferably, the curing head temperature is 70-90 ℃, e.g., 75 ℃, 80 ℃, 85 ℃, etc.

In a second aspect, the invention provides the use of the cable of the first aspect in a vessel.

Compared with the prior art, the invention has the following beneficial effects:

(1) According to the cable, the cable can achieve a large outer diameter, has excellent mechanical property, heat aging resistance, mineral oil resistance and tearing resistance, is high in crosslinking degree, is simple in process and high in operability, and solves the problems that insulation is broken down, a sheath is cracked, charges are accumulated and the like after the cable is irradiated and crosslinked due to the fact that the voltage level is greatly improved, and the quality problems that a braided cage is easily formed or the sheath is easily emptied in the vulcanization process of the cable with the large outer diameter are solved.

(2) In the invention, in a preferred range, the tensile strength of the cable before aging is between 11.8 and 14.5MPa, the elongation at break is above 200 percent, the change rate of the tensile strength after heat aging is within +/-10 percent, the change rate of the elongation at break is within +/-5 percent, the change rate of the tensile strength after mineral oil resistance test is within-23 to-15 percent, the change rate of the elongation at break is within-22 to-10 percent, the elongation at break under load is between 15 and 20 percent in a heat extension test, the limit value is within 10 percent, the tensile strength in a tearing resistance test is above 7.0N/mm, and the tensile strength meets the requirement of a specified value (3.5U) in a compression resistance test ₀ 5 min), and also meets the standard requirements in terms of apparent mass.

Drawings

FIG. 1 is a schematic view of a cable according to the present invention;

wherein 1-comprises a wrapped conductor; 2-a conductor shield layer; 3-an insulating layer; 4-an insulating shielding layer; a 5-metal shielding layer; 6-filling; 7-a cabling layer; 8-armor layer; 9-sheath layer.

Detailed Description

To facilitate understanding of the present invention, examples are set forth below. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.

In the present invention, the purchase information of part of the raw materials in each embodiment is as follows:

ethylene-vinyl acetate copolymer: purchased from dupont under the designation V422.

Polyethylene: purchased from Zhongxiao, with the brand 7042.

An elastomer: the name POE is purchased from Sanjing and the brand is A-0550S.

And (3) a compatilizer: under the name MA-POE, purchased under Yu Ruicheng, under the name MOG715.

Color master batch: purchased from cabot under the trade designation 2014.

Aluminum hydroxide: purchased from Rhin Hilde under the designation LY-SP.

Magnesium hydroxide: yu Jike, trade name A7.

Flame-retardant master batch: the nitrogen-phosphorus compound flame-retardant master batch is purchased from Li Saide and has the brand of LFR-8003.

Nano synergist: the name is nano montmorillonite, purchased from the strong landscape chemical industry and the brand is Clay 80T.

An antioxidant: and the name is 1010/168/1545, which is purchased from the Lianyheng chemical industry.

And (3) a lubricant: the name PE wax is purchased from qi hong polymer and is named S3816.

Coupling agent: the name is KH550, purchased from Xinglong chemical industry and the brand is 550.

Crosslinking agent: the name TMPTMA is purchased from Beijing Pu, guangzhou and has the brand name PL400.

Semiconductive tape: the material is a semi-conductive Teflon tape, purchased from a sink.

Conductor shielding layer: the material is a semi-conductive shielding material, which is purchased from Haijiang under the brand name of PEJD-35.

Insulating layer: the ethylene propylene rubber is purchased from the upper new material and is marked as XJ-30B.

Insulating shielding layer: the material is a semi-conductive shielding material, purchased from the upper new material and marked XPB-30A.

Metal shielding layer: the material is tinned copper wire, purchased Yu Ruiyang.

Filling: the material is halogen-free material and is purchased from the long jing.

And (3) cabling layer: the material is halogen-free material and is purchased from the sink.

Armor layer: the material is tinned copper wire, purchased Yu Ruiyang.

Examples 1 to 3

Examples 1-3 provide a cable whose structure is schematically shown in fig. 1, wherein a conductor layer, a cable-forming layer 7 (the nominal thickness of a halogen-free tape is 0.2 mm), an armor layer 8 (the nominal diameter of a metal wire is 0.4 mm) and a sheath layer 9 (the nominal thickness is 2.7 mm) are arranged in sequence from inside to outside; wherein the conductor layer comprises 3 conductive elements, the conductive elements comprise a conductor 1 (with the nominal diameter of 10.5 mm) containing a wrapping, a conductor shielding layer 2 (with the nominal thickness of 0.8 mm), an insulating layer 3 (with the nominal thickness of 4.5 mm), an insulating shielding layer 4 (with the nominal thickness of 0.8 mm) and a metal shielding layer 5 (with the nominal diameter of 0.25 mm), and a filler 6 is arranged between the conductor layer and the cabling layer; wherein, the raw materials for preparing the sheath layer are shown in table 1 according to parts by weight.

TABLE 1

In examples 1-3, the method of making the cable comprises the steps of:

the cable is obtained by sequentially arranging a conductor shielding layer, an insulating shielding layer and a metal shielding layer on the surface of a conductor containing a wrapping bag to form conductive elements, bundling three conductive elements to form a conductor layer, arranging a cable layer, an armor layer and a sheath layer, and arranging a filler between the cable layer and the conductor layer.

The conductor containing the wrapping is formed by binding, twisting and wrapping semi-conductive wrapping tape by tinned copper wires.

The method for setting the sheath layer comprises the following steps: weighing the components of the formula according to the proportion, firstly weighing powder, stirring the powder in a high-speed stirrer for 1.5 minutes, pouring out the powder, weighing oil according to the proportion, adding the weighed and mixed materials into a small internal mixer for mixing, wherein the mixing temperature is 110 ℃, the mixing time is 7 minutes, and then carrying out irradiation after extrusion molding on the surface of an armor layer, wherein the irradiation process conditions are as follows: the energy was set at 2.1MeV at maximum per device, the remaining parameters: threading pass 6, beam current 20mA and appearance speed 9m/min; and obtaining the sheath layer.

Example 4

The present example differs from example 1 in that the process conditions for the irradiation are: the energy was set at 2.1MeV at maximum per device, the remaining parameters: pass 6, beam 20mA, appearance speed 6m/min, and the rest are the same as in example 1.

Example 5

The present example differs from example 1 in that the process conditions for the irradiation are: the energy was set at 1.0MeV at maximum per device, the remaining parameters: pass 6, 20mA beam, 9m/min appearance speed, and the rest are the same as in example 1.

Example 6

The present example differs from example 1 in that the process conditions for the irradiation are: the energy was set at 1.8MeV at maximum per device, the remaining parameters: pass 6, beam 20mA, appearance speed 6m/min, and the rest are the same as in example 1.

Example 7

The difference between this embodiment and embodiment 1 is that the method for setting the sheath layer includes the following steps: mixing the preparation raw materials of the sheath layer, and then carrying out vulcanization after extrusion molding on the surface of the armor layer, wherein the vulcanization process conditions are as follows: the air pressure is 8.0bar, the water level is 10%, and the speed is 3.2m/min; host temperature: 55 ℃ (zone 1), 60 ℃ (zone 2), 65 ℃ (zone 3), 70 ℃ (zone 4), 75 ℃ (zone 5); temperature of the machine head: 80 ℃ (zone 1), 80 ℃ (zone 2), 80 ℃ (zone 3), the remainder being the same as example 1.

Example 8

This example differs from example 7 in that the water level is 30% and the remainder is the same as example 7.

Comparative example 1

This comparative example differs from example 1 in that the nano synergist, which is a preparation raw material for the sheath layer, was replaced with calcium carbonate, and the rest is the same as example 1.

Performance testing (per GJB 1916-1994)

The cables described in examples 1-8 and comparative example 1 were tested as follows:

(1) Tensile Strength before aging

(2) Elongation at break before aging

(3) Tensile strength change rate after heat aging: after treatment at 135.+ -. 2 ℃ for 168 hours, the tensile strength was measured, and the rate of change in tensile strength was calculated.

(4) Elongation at break change after heat aging: after being treated at 135+ -2 ℃ for 168 hours, the test pieces were tested for elongation at break, and the change rate of elongation at break was calculated.

(5) Tensile strength change rate after mineral oil immersion: the tensile strength was measured by immersing in mineral oil (902 #) at 121.+ -. 2 ℃ for 18 hours, and the rate of change of the tensile strength was calculated.

(6) Elongation at break change rate after mineral oil immersion: the test pieces were immersed in mineral oil at 121.+ -. 2 ℃ for 18 hours, and the elongation at break was measured to calculate the elongation at break change rate.

(7) Elongation at break under load after thermal elongation experiments: 6 samples of the inner layer in different directions are taken, time sequence is 15min at 200+/-2 ℃, and elongation at break is tested.

(8) Tensile strength in tear test: 3 samples of the outer layer were taken in different directions and tested for tensile strength.

(9) Voltage resistance.

(10) Apparent mass.

The test results are summarized in tables 2 and 3.

TABLE 2

TABLE 3 Table 3

	Elongation under load in thermal elongation	Tensile Strength under tear test	Requirements for electrical resistance
				Unit (B)	％	N/mm	kV
Example 1	15、15、20、15、20、20	7.9、7.6、8.5、8.2、7.2、8.0	Qualified product
				Example 2	15、20、20、15、15、20	7.4、7.8、7.6、7.9、7.2、8.0	Qualified product
Example 3	20、20、20、15、20、15	7.2、7.6、7.5、7.2、7.2、7.0	Qualified product
				Example 4	10、5、10、15、10、15	6.0、5.8、5.7、6.1、5.3、5.2	Failure to pass
Example 5	35、65、55、75、15、45	9.5、9.6、9.0、6.8、8.9、7.6	Qualified product
				Example 6	10、5、60、15、50、15	6.0、5.1、9.8、7.0、5.2、5.8	Failure to pass
Comparative example 1	35、30、25、30、20、30	6.5、6.6、6.4、6.8、6.3、6.5	Qualified product
					Elongation under load in thermal elongation	Tensile Strength under tear test	Apparent mass
Unit (B)	％	N/mm	-
				Example 7	10、15、20、15、15、20	8.1、7.6、7.5、8.3、7.6、8.0	Qualified product
Example 8	20、20、20、15、20、15	7.2、7.6、7.5、7.2、7.2、7.0	Failure to pass

From analysis of the data in tables 2 and 3, it is known that the tensile strength of the cable before aging is between 10.6 and 14.5MPa, the elongation at break is between 160 and 260%, the tensile strength change rate after heat aging is within + -10%, the elongation at break change rate is within + -10%, the tensile strength change rate after mineral oil resistance test is within-58% to-15%, the elongation at break change rate is within-22% to-9%, the elongation at break under load is between 15 and 75% in a heat extension experiment, the tensile strength is above 5.1N/mm in a tearing test, and the tensile strength meets the requirement of a specified pressure resistance value (3.5U 0,5 min) in a pressure resistance test, and also meets the standard requirement in terms of apparent mass; the cable disclosed by the invention can realize large outer diameter, has excellent mechanical property, heat aging resistance, mineral oil resistance and tearing resistance, and is high in product crosslinking degree, the sheath layer of the cable is simple in process and high in operability, and the problems that insulation is broken down, the sheath is cracked, charges are accumulated and the like after the cable is irradiated and crosslinked due to the large-scale voltage of the cable are solved, and the quality problems that a braided cage is easily formed or the sheath is easily emptied in the vulcanizing process of the cable with large outer diameter are solved.

In a preferred range (taking examples 1-3 and 7 as examples), the tensile strength of the cable before aging is between 11.8 and 14.5MPa, the elongation at break is above 200%, the tensile strength change rate after heat aging is within +/-10%, the elongation at break is within +/-5%, the tensile strength change rate after mineral oil resistance test is within-23% to-15%, the elongation at break is within-22% to-10%, the elongation at break under load is between 15% and 20% in a heat extension experiment, the limit value is within 10%, the tensile strength is above 7.0N/mm in a tearing resistance test, and the tensile strength meets the specified pressure resistance value requirement (3.5U0, 5 min) in a pressure resistance test, and meets the standard requirement in apparent mass.

In the prior art, the conventional warship medium-voltage power cable sheath adopts a crosslinked polyolefin sheath material, irradiation crosslinking is needed, and in the irradiation crosslinking process, an electron accelerator generates high-energy electron beams to bombard a skin layer, so that a molecular chain is broken to form high-molecular free radicals, and then the high-molecular free radicals are recombined into a crosslinking bond, so that the original linear molecular structure is changed into a three-dimensional reticular molecular structure. However, the structural characteristic is usually highlighted by breaking through the grade improvement to 25/36kV after the external diameter of the medium-voltage power cable is larger and the sheath layer is larger. The cable external diameter is great, and the sheath cortex is thicker to lead to the cable in the irradiation process, gamma particle electron beam can't fully pierce through the cortex or the irradiation dose is not enough and lead to the irradiation inhomogeneous, and the cable sheath in-layer outer layer appears the crosslinking degree difference great, can't satisfy the condition of product performance.

Analysis of comparative example 1 and example 1 shows that comparative example 1 has less performance than example 1, demonstrating that the cable formed from the material of the jacket layer according to the present invention has better performance.

Analysis of examples 4-6 and example 1 shows that examples 4-6 perform less well than example 1, demonstrating better cable performance with the sheath layer using an irradiation process to control energy and rate of occurrence within preferred ranges.

As can be seen from an analysis of example 8 and example 7, the performance of example 8 is not as good as that of example 7, and it is proved that the cable formed by the vulcanization process for the sheath layer and controlling the water level within the preferred range has better performance.

The applicant states that the detailed method of the present invention is illustrated by the above examples, but the present invention is not limited to the detailed method described above, i.e. it does not mean that the present invention must be practiced in dependence upon the detailed method described above. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.

Claims

1. The cable for the ship is characterized by comprising a conductor layer, a cabling layer, an armor layer and a sheath layer which are sequentially arranged from inside to outside;

2. the cable of claim 1, wherein the conductor layer comprises at least 1 conductive element;

preferably, the conductive element comprises a conductor containing a wrapping, a conductor shielding layer, an insulating shielding layer and a metal shielding layer which are sequentially arranged from inside to outside;

preferably, a filler is also arranged between the conductor layer and the cabling layer;

preferably, the elastomer comprises any one or a combination of at least two of a polyethylene octene co-elastomer, a vinyl polymer grafted polyether polyol, or a thermoplastic vulcanizate;

preferably, the filler comprises a masterbatch.

3. The cable of claim 1 or 2, wherein the auxiliary agent comprises any one or a combination of at least two of a compatibilizer, flame retardant, nanosynergist, antioxidant, lubricant, coupling agent, or cross-linking agent.

4. A cable according to claim 3, wherein the compatibilising agent is present in an amount of 5 to 10 parts by weight;

preferably, the flame retardant comprises any one or a combination of at least two of aluminum hydroxide, magnesium hydroxide or nitrogen-phosphorus compound flame retardant master batches;

preferably, the weight part of the flame retardant is 5-210 parts;

preferably, the weight part of the aluminum hydroxide is 120-150 parts;

preferably, the weight part of the magnesium hydroxide is 20-50 parts;

preferably, the weight part of the flame-retardant master batch is 5-10 parts;

preferably, the weight part of the nano synergist is 5-10 parts;

preferably, the antioxidant is 1-3 parts by weight;

preferably, the weight part of the lubricant is 1-3 parts;

preferably, the weight part of the coupling agent is 0.5-1.5 parts;

preferably, the weight part of the cross-linking agent is 1-2 parts.

5. A method of producing a cable according to any one of claims 1 to 4, comprising the steps of:

6. The method of manufacturing according to claim 5, wherein the method of disposing the sheath layer includes: mixing the preparation raw materials of the sheath layer, extruding and molding the surface of the armor layer, and then carrying out irradiation or vulcanization to obtain the sheath layer.

7. The method according to claim 6, wherein the temperature of the kneading is 105 to 115 ℃;

preferably, the mixing time is 6-8min.

8. The preparation method according to claim 6 or 7, wherein the outer diameter of the cable is less than or equal to 70mm, and the sheath layer is arranged in an irradiation manner;

preferably, the energy of the irradiation is 1.8-2.1MeV;

preferably, the irradiation passes are 4-8;

preferably, the irradiation beam current is 10-30mA;

preferably, the irradiation occurs at a rate of 7-12m/min.

9. The method according to any one of claims 6 to 8, wherein the cable has an outer diameter of > 70mm and the jacket layer is provided by means of vulcanization;

preferably, the water level of the vulcanization is less than or equal to 25%;

preferably, the vulcanizing air pressure is 7-12bar;

preferably, the vulcanization speed is 2-5m/min;

preferably, the temperature of the vulcanized host is 50-80 ℃;

preferably, the curing head temperature is 70-90 ℃.

10. Use of the cable of any one of claims 1-4 in a ship.