A special cable for ocean-going ships and its preparation method

Abstract

The present invention discloses a special cable for ocean-going ships and a preparation method thereof, which relates to the technical field of cables. In the present invention, a two-component silicone rubber and linear low-density polyethylene are used as the matrix, and pre-crosslinking is carried out through a crosslinking agent 1,4-bis(tert-butylperoxyisopropyl)benzene and a co-crosslinking agent triallyl isocyanurate, so as to achieve the effects of fire resistance and high temperature resistance. Then, short alumina fibers and phosphate glass are added. At high temperature, the molten phosphate presents a glassy phase, fills the pores generated by the thermal decomposition of the polymer, and connects with alumina, thereby generating an aluminum phosphate crystal phase to delay the decomposition of internal macromolecular substances. Finally, through radiation crosslinking, the polymer and the silicone rubber form a network structure to make up for the side effects caused by the addition of fillers, and the polar groups generated by radiation improve the interfacial properties between the matrix and the fillers. At the same time, the ring-opening reaction of triallyl isocyanurate occurs, thereby further enhancing the fire resistance and high temperature resistance of the matrix material.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a special cable for ocean-going ships and a preparation method thereof. Background Art

[0002] With the continuous improvement of electrification and automation of naval ships, the planning and safe operation of power systems have become an important part of modern naval equipment. Various types of power cables and signal cables distributed inside and outside the ship are responsible for providing power supply and signal transmission for various electrical equipment on the ship.

[0003] Naval ships operate in harsh environments of high humidity, high heat, and high salinity corrosion all year round. Marine cables directly exposed to such harsh environments will gradually age or even be damaged. Cable aging is a major hidden danger that threatens the safety of ship navigation. In order to improve the reliability of ship electrical system operation, increase the service life of cables, and reduce the maintenance cost of equipment, a metal sheath made of copper alloy or zinc alloy is usually sheathed on the outside of the cable in the past. These two metal materials provide a certain protection for the cable, but these two alloys will produce electrochemical reactions with steel in seawater or high salinity environments, greatly accelerating the corrosion rate of steel, causing significant damage to the surface of the ship's steel structure, and increasing the maintenance cost of the weapon system; and because this hard metal cable sheath cannot fit well with the soft cable, the sealing effect is poor, and the protection function of the cable is reduced. At the same time, the metal sheath is heavy, which brings certain difficulties to the hull itself and installation and fixation.

[0004] The situation at sea is also exacerbated by the fact that even after subdivision, the source of the fire is often impossible to reach, even if repairs are attempted. The successful implementation of firefighting is hampered in particular by the general decline in crew numbers due to widespread automation today. And precisely in emergency situations, there is hardly any crew available to fight the fire, because other vital tasks need to be completed. And if the firefighting water is sprayed over too large an area and cannot be discharged to the outer bilge through scuppers and sluices, it may cause the ship to list dangerously. At first glance, cables seem to be unnoticeable system components, but as the "blood and nerves" of the ship, they are of decisive importance in their application. The example of the new generation of special cables shows that the safety factor can continue to be increased even today through the long-term use of advanced high-performance materials, so that defense capabilities can be maintained and lives can be saved in emergency situations. High-performance materials are highly safe in shipbuilding, they maintain the functioning of systems for longer in the event of a fire and help protect the ship and the crew. Summary of the invention

[0005] The object of the present invention is to provide a special cable for ocean-going ships and a preparation method thereof to solve the problems existing in the prior art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A preparation method of a special cable for ocean-going ships, comprising the following preparation steps:

[0007] (1) Mix two-component silicone rubber, linear low-density polyethylene, 1,4-bis(tert-butylperoxyisopropyl)benzene, and triallyl isocyanurate, carry out melt pre-crosslinking, and then add antioxidant 1010 and antioxidant 168, and blend for 10 min to obtain intermediate A;

[0008] (2) Wrap intermediate A on a two-roll mill with a roll gap of 1-4 mm, sequentially add alumina fiber and phosphate glass powder, and carry out mixing, and then carry out electron beam irradiation crosslinking to obtain a fire-resistant blended polymer material;

[0009] (3) Coat the fire-resistant blended polymer material on a tinned conductor with a thickness of 0.8-2 mm, and cover it with a shielding layer woven from tinned copper wires and a protective layer made of the fire-resistant blended polymer material to obtain a special cable for ocean-going ships.

[0010] Further, the preparation method of the two-component silicone rubber in step (1): Mix vinyl silicone oil, hexamethyldisilazane, and deionized water according to a mass ratio of 100:10-30:1-5, heat up to 100-160 °C, stir at 60-150 rpm for 20-50 min, add fumed silica in an amount of 0.1-0.2 times the mass of the vinyl silicone oil, and continue stirring for 3-6 h to obtain a base material; Mix the base material, vinyl silicone oil, and platinum catalyst according to a mass ratio of 100:0.2-1:10 -5 Mix to obtain component A; Mix the base material, hydrogen-containing silicone oil, ethynylcyclohexanol, and vinyltri-tert-butylperoxysilane according to a mass ratio of 100:0.5:0.01:0.1-0.5 to obtain component B; Mix component A and component B according to a mass ratio of 1:1 to obtain two-component silicone rubber.

[0011] Further, the model of the linear low-density polyethylene in step (1) is DFDA-6101.

[0012] Further, the melting temperature in step (1) is 140-190 °C, the time is 10-30 min, and the rotation speed is 60-120 rpm.

[0013] Further, the mass ratio of the two-component silicone rubber, linear low-density polyethylene, 1,4-bis(tert-butylperoxyisopropyl)benzene, triallyl isocyanurate, antioxidant 1010, and antioxidant 168 in step (1) is 100:30-70:0.3-1.2:0.1-0.6:2:1.

[0014] Further, the length of the alumina fiber described in step (2) is 0.1 - 1 mm.

[0015] Further, the temperature of the kneading described in step (2) is 90 - 125 °C and the time is 30 - 70 min.

[0016] Further, the process parameters of the electron beam irradiation described in step (2) are: the irradiation energy is 1.5 MeV and the dose is 100 - 200 kGy.

[0017] Further, the mass ratio of the intermediate A, the alumina fiber, and the phosphate glass powder described in step (2) is 80:10 - 20:15 - 30.

[0018] Further, the thickness of the shielding layer described in step (3) is 0.5 - 2 mm, and the thickness of the protective layer is 2 - 5 mm.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] The present invention uses a two-component silicone rubber and linear low-density polyethylene as the matrix, and is pre-crosslinked with a crosslinking agent 1,4-bis(tert-butylperoxyisopropyl)benzene and a co-crosslinking agent triallyl isocyanurate. At high temperatures, 1,4-bis(tert-butylperoxyisopropyl)benzene homolyzes to generate alkoxy radicals, which abstract active hydrogen atoms from the silicone rubber, thereby increasing the activity of the silicone rubber. Under the catalytic action of metallic platinum, self-crosslinking occurs to form a high-molecular polymer with a dimethylsiloxane main chain, while physical crosslinking is formed with the linear macromolecules of polyethylene. Moreover, triallyl isocyanurate enhances the stability of the crosslinked structure through its triazine ring structure, so that the matrix material is not prone to bending and collapse at high temperatures, achieving the effects of fire resistance and high-temperature resistance. Then, short alumina fibers are added, and through the tensile force, the fibers are evenly dispersed in the matrix. During this process, the orderliness of the crosslinked macromolecular chains in the matrix is also improved. At the same time, phosphate glass is used as a flux. At high temperatures, the molten phosphate is in a glassy liquid phase, filling the pores generated by the thermal decomposition of the polymer and connecting with alumina. Through the phosphorus oxides in the phosphate glass powder, an aluminum phosphate crystal phase is generated. The formation of the crystal phase can limit the fluidity of the molten glassy liquid phase, thereby improving the self-supporting performance and shape stability of the matrix, and gradually forming a hard and dense porcelain shell on the surface, significantly reducing the thermal conductivity of the matrix, delaying the further decomposition of the internal high-molecular substances, and greatly enhancing the fire resistance and high-temperature stability of the matrix. Finally, through radiation crosslinking, hydrogen bond binding is formed between the molecular chains of the polymer and the silicone rubber to form a network structure, thereby increasing the binding force between macromolecules, making up for the side effects caused by the addition of fillers, and thus improving the tensile strength of the matrix material. Moreover, the polar groups generated by radiation improve the interfacial performance between the matrix and the filler. At the same time, triallyl isocyanurate undergoes a ring-opening reaction under the action of radiation to form active bridge bonds with the polymer, further increasing the crosslinking degree between the components, thereby enhancing the fire resistance and high-temperature resistance of the matrix material. Detailed implementation manners

[0021] The following will describe clearly and completely the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] In order to more clearly illustrate the method provided by the present invention, the following embodiments are used for detailed description. The test methods for each index of the special cable for ocean-going ships manufactured in the following embodiments are as follows:

[0023] High temperature resistance: Samples of the same size from the examples and the comparative examples were tested for their high temperature resistance. After being placed at 150 °C for 100 h, the tensile strength and elongation at break were detected with reference to GB / T 1040.

[0024] Fire resistance: Samples of the same size from the examples and the comparative examples were tested for the limiting oxygen index (LOI) according to GB / T 2406.2.

[0025] Example 1; (1) Vinyl silicone oil, hexamethyldisilazane, and deionized water were mixed at a mass ratio of 100:10:1, heated to 100 °C, and stirred at 60 rpm for 20 min. Then, silica white with a mass 0.1 times that of the vinyl silicone oil was added, and stirring was continued for 3 h to obtain a base material. The base material, vinyl silicone oil, and platinum catalyst were mixed at a mass ratio of 100:0.2:10 -5 to obtain Component A; the base material, hydrogen-containing silicone oil, ethynylcyclohexanol, and vinyltri-tert-butylperoxysilane were mixed at a mass ratio of 100:0.5:0.01:0.5 to obtain Component B; Component A and Component B were mixed at a mass ratio of 1:1 to obtain a two-component silicone rubber; the two-component silicone rubber, linear low-density polyethylene DFDA-6101, 1,4-bis(tert-butylperoxyisopropyl)benzene, and triallyl isocyanurate were mixed and melt-pre-crosslinked at a temperature of 140 °C, a time of 10 min, and a rotation speed of 60 rpm. Then, antioxidant 1010 and antioxidant 168 were added and blended for 10 min to obtain Intermediate A; the mass ratio of the two-component silicone rubber, linear low-density polyethylene DFDA-6101, 1,4-bis(tert-butylperoxyisopropyl)benzene, triallyl isocyanurate, antioxidant 1010, and antioxidant 168 was 100:30:0.3:0.1:2:1;

[0026] (2) Intermediate A was wrapped on a two-roll mill with a roll gap of 1 mm. Alumina fibers with a length of 0.1 mm and phosphate glass powder were added in sequence and kneaded at a temperature of 90 °C for 30 min. Then, electron beam irradiation crosslinking was carried out with process parameters: irradiation energy of 1.5 MeV and dose of 100 kGy to obtain a fire-resistant blended polymer material; the mass ratio of Intermediate A, alumina fibers with a length of 0.1 mm, and phosphate glass powder was 80:10:15;

[0027] (3) The fire-resistant blended polymer material was used to coat a tinned conductor with a thickness of 0.8 mm, and a shielding layer made of tinned copper wire with a thickness of 0.5 mm and a protective layer made of the fire-resistant blended polymer material with a thickness of 2 mm were covered to obtain a special cable for ocean-going ships.

[0028] Example 2; (1) Mix vinyl silicone oil, hexamethyldisilazane, and deionized water in a mass ratio of 100:20:3. Heat to 130°C and stir at 100 rpm for 35 min. Add fumed silica in an amount 0.15 times the mass of the vinyl silicone oil and continue stirring for 4.5 h to obtain a base material. Mix the base material, vinyl silicone oil, and platinum catalyst in a mass ratio of 100:0.6:10 -5 to obtain Component A; mix the base material, hydrogen-containing silicone oil, ethynylcyclohexanol, and vinyltri-tert-butylperoxysilane in a mass ratio of 100:0.5:0.01:0.3 to obtain Component B; mix Component A and Component B in a mass ratio of 1:1 to obtain a two-component silicone rubber; mix the two-component silicone rubber, linear low-density polyethylene DFDA-6101, 1,4-bis(tert-butylperoxyisopropyl)benzene, and triallyl isocyanurate, and conduct melt pre-crosslinking at a temperature of 165°C, a time of 20 min, and a rotation speed of 90 rpm. Then add antioxidant 1010 and antioxidant 168 and blend for 10 min to obtain Intermediate A; the mass ratio of the two-component silicone rubber, linear low-density polyethylene DFDA-6101, 1,4-bis(tert-butylperoxyisopropyl)benzene, triallyl isocyanurate, antioxidant 1010, and antioxidant 168 is 100:50:0.7:2:0.4:2:1;

[0029] (2) Wrap Intermediate A on a two-roll mill with a roll gap of 2.5 mm. Sequentially add alumina fibers with a length of 0.5 mm and phosphate glass powder and conduct mixing at a temperature of 112°C for 50 min. Then conduct electron beam irradiation crosslinking with process parameters: irradiation energy of 1.5 MeV and dose of 150 kGy to obtain a fire-resistant blended polymer material; the mass ratio of Intermediate A, alumina fibers with a length of 0.5 mm, and phosphate glass powder is 80:15:23;

[0030] (3) Coat the fire-resistant blended polymer material on a tinned conductor with a thickness of 1.2 mm, and cover it with a shielding layer made of tinned copper wire braid with a thickness of 1.1 mm and a protective layer made of the fire-resistant blended polymer material with a thickness of 3.5 mm to obtain a special cable for ocean-going ships.

[0031] Example 3; (1) Mix vinyl silicone oil, hexamethyldisilazane, and deionized water in a mass ratio of 100:30:5. Heat to 160°C and stir at 150 rpm for 50 min. Add fumed silica in an amount 0.2 times the mass of the vinyl silicone oil and continue stirring for 6 h to obtain a base material. Mix the base material, vinyl silicone oil, and platinum catalyst in a mass ratio of 100:1:10 -5Mix to obtain Component A; mix base material, hydrogen-containing silicone oil, ethynylcyclohexanol, and vinyltri-tert-butylperoxysilane in a mass ratio of 100:0.5:0.01:0.5 to obtain Component B; mix Component A and Component B in a mass ratio of 1:1 to obtain a two-component silicone rubber; mix the two-component silicone rubber, linear low-density polyethylene DFDA-6101, 1,4-bis(tert-butylperoxyisopropyl)benzene, and triallyl isocyanurate, and conduct melt pre-crosslinking at a temperature of 190 °C, for a time of 30 min, and a rotation speed of 120 rpm, then add antioxidant 1010 and antioxidant 168, and blend for 10 min to obtain Intermediate A; the mass ratio of the two-component silicone rubber, linear low-density polyethylene DFDA-6101, 1,4-bis(tert-butylperoxyisopropyl)benzene, triallyl isocyanurate, antioxidant 1010, and antioxidant 168 is 100:70:1.2:0.6:2:1;

[0032] (2) Wrap Intermediate A on a two-roll mill with a roll gap of 4 mm, sequentially add alumina fibers with a length of 1 mm and phosphate glass powder, and conduct mixing at a temperature of 125 °C for a time of 70 min, then conduct electron beam irradiation crosslinking with process parameters: irradiation energy of 1.5 MeV and dose of 200 kGy to obtain a fire-resistant blended polymer material; the mass ratio of Intermediate A, alumina fibers with a length of 1 mm, and phosphate glass powder is 80:20:30;

[0033] (3) Coating the fire-resistant blended polymer material on a tinned conductor with a thickness of 2 mm, and covering a shielding layer made of tinned copper wire braid with a thickness of 2 mm and a protective layer made of the fire-resistant blended polymer material with a thickness of 5 mm to obtain a special cable for ocean-going ships.

[0034] Comparative Example 1; the difference between Comparative Example 1 and Example 2 lies in step (1). Modify step (1) to: Mix vinyl silicone oil, hexamethyldisilazane, and deionized water in a mass ratio of 100:20:3, heat up to 130 °C, stir at 100 rpm for 35 min, add fumed silica with a mass 0.15 times that of vinyl silicone oil, and continue stirring for 4.5 h to obtain a base material; the mass ratio of the base material, vinyl silicone oil, and platinum catalyst is 100:0.6:10 -5Mix to obtain Component A; mix base material, hydrogen-containing silicone oil, ethynylcyclohexanol, and vinyltri-tert-butylperoxysilane in a mass ratio of 100:0.5:0.01:0.3 to obtain Component B; mix Component A and Component B in a mass ratio of 1:1 to obtain a two-component silicone rubber; mix the two-component silicone rubber, linear low-density polyethylene DFDA-6101, and 1,4-bis(tert-butylperoxyisopropyl)benzene, and conduct melt pre-crosslinking at a temperature of 165°C, a time of 20 min, and a rotation speed of 90 rpm. Then add antioxidant 1010 and antioxidant 168, and blend for 10 min to obtain Intermediate A; the mass ratio of the two-component silicone rubber, linear low-density polyethylene DFDA-6101, 1,4-bis(tert-butylperoxyisopropyl)benzene, antioxidant 1010, and antioxidant 168 is 100:50:0.7:2:1; the remaining steps are the same as in Example 2.

[0035] Comparative Example 2; the difference between Comparative Example 2 and Example 2 lies in step (2). Modify step (2) as follows: Wrap Intermediate A on a two-roll mill with a roll gap of 2.5 mm, add phosphate glass powder, and conduct mixing at a temperature of 112°C for 50 min. Then conduct electron beam irradiation crosslinking with the following process parameters: irradiation energy of 1.5 MeV and dose of 150 kGy to obtain a fire-resistant blended polymer material; the mass ratio of Intermediate A to phosphate glass powder is 80:23; the remaining steps are the same as in Example 2.

[0036] Comparative Example 3; the difference between Comparative Example 3 and Example 2 lies in step (2). Modify step (2) as follows: Wrap Intermediate A on a two-roll mill with a roll gap of 2.5 mm, add alumina fibers with a length of 0.5 mm, and conduct mixing at a temperature of 112°C for 50 min. Then conduct electron beam irradiation crosslinking with the following process parameters: irradiation energy of 1.5 MeV and dose of 150 kGy to obtain a fire-resistant blended polymer material; the mass ratio of Intermediate A to alumina fibers with a length of 0.5 mm is 80:15; the remaining steps are the same as in Example 2.

[0037] Comparative Example 4; the difference between Comparative Example 4 and Example 2 lies in step (2). Modify step (2) as follows: Wrap Intermediate A on a two-roll mill with a roll gap of 2.5 mm, sequentially add alumina fibers with a length of 0.5 mm and phosphate glass powder, and conduct mixing at a temperature of 112°C for 50 min to obtain a fire-resistant blended polymer material; the mass ratio of Intermediate A, alumina fibers with a length of 0.5 mm, and phosphate glass powder is 80:15:23; the remaining steps are the same as in Example 2.

[0038] Effect Example

[0039] Table 1 below shows the performance analysis results of special cables for ocean-going ships using Examples 1 to 3 of the present invention and Comparative Examples 1 to 4.

[0040] Table 1

[0041]

[0042] From the comparison of the experimental data of the embodiment and the comparative example in Table 1, it can be found that the present invention uses two-component silicone rubber and linear low-density polyethylene as a matrix, and pre-crosslinks are performed by a crosslinking agent 1,4-bis(tert-butylperoxyisopropyl)benzene and an auxiliary crosslinking agent triallyl isocyanurate. Under high temperature conditions, 1,4-bis(tert-butylperoxyisopropyl)benzene is homolytically split to generate alkoxy free radicals, and the alkoxy free radicals capture active hydrogen atoms from the silicone rubber, thereby improving the activity of the silicone rubber. While self-crosslinking occurs, physical crosslinks are formed with polyethylene linear macromolecules, and triallyl isocyanurate enhances the stability of the crosslinked structure through its triazine benzene ring structure, thereby achieving fire resistance and high temperature resistance. Alumina short fibers are then added, and the fibers are evenly distributed in the matrix through a tensile force. Dispersion, and at the same time using phosphate glass as a flux, at high temperature, fill the pores generated by the thermal decomposition of the polymer, and connect with alumina to generate aluminum phosphate crystal phase, thereby improving the self-supporting performance and shape stability of the matrix, and gradually forming a hard and dense porcelain shell on the surface, delaying the decomposition of internal polymer substances, greatly improving the fire resistance and high temperature stability of the matrix, and finally through radiation cross-linking, hydrogen bonds are formed between the molecular chains of the polymer and the silicone rubber to form a network structure, thereby compensating for the side effects caused by the addition of fillers, thereby improving the tensile strength of the matrix material, and the polar groups generated by irradiation improve the interface performance between the matrix and the filler, and at the same time, triallyl isocyanurate forms an active bridge bond with the polymer under the action of radiation, further enhancing the fire resistance and high temperature resistance of the matrix material.

[0043] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A preparation method of a special cable for ocean-going ships, characterized in that, It includes the following preparation steps: (1)Mix vinyl silicone oil, hexamethyldisilazane, and deionized water in a mass ratio of 100:10 - 30:1 - 5, heat up to 100 - 160 °C, stir at 60 - 150 rpm for 20 - 50 min, add fumed silica with a mass 0.1 - 0.2 times that of the vinyl silicone oil, and continue stirring for 3 - 6 h to obtain the base material; mix the base material, vinyl silicone oil, and platinum catalyst in a mass ratio of 100:0.2 - 1:10 -5 to obtain Component A; mix the base material, hydrogen-containing silicone oil, ethynylcyclohexanol, and vinyltri-tert-butylperoxysilane in a mass ratio of 100:0.5:0.01:0.1 - 0.5 to obtain Component B; mix Component A and Component B in a mass ratio of 1:1 to obtain a two-component silicone rubber; mix the two-component silicone rubber, linear low-density polyethylene, 1,4-bis(tert-butylperoxyisopropyl)benzene, and triallyl isocyanurate, conduct melt pre-crosslinking, and then add antioxidant 1010 and antioxidant 168 and blend for 10 min to obtain Intermediate A; (2) Wrap intermediate A on a double roll with a roll gap of 1 - 4 mm. Add alumina fiber and phosphate glass powder in sequence and carry out kneading, then carry out electron beam irradiation crosslinking to obtain a refractory blended polymer material; (3) Coat the tinned conductor with the refractory blended polymer material to a thickness of 0.8 - 2 mm, and cover it with a shielding layer woven from tinned copper wire and a protective layer made of the refractory blended polymer material to obtain a special cable for ocean - going ships.

2. The preparation method of a special cable for ocean-going ships according to claim 1, wherein The model of the linear low - density polyethylene in step (1) is DFDA - 6101.

3. The preparation method of a special cable for ocean-going ships according to claim 1, characterized in that, In step (1), the melting temperature is 140 - 190 °C, the time is 10 - 30 min, and the rotation speed is 60 - 120 rpm.

4. The preparation method of a special cable for ocean-going ships according to claim 1, characterized in that In step (1), the mass ratio of the two - component silicone rubber, linear low - density polyethylene, 1,4 - bis(tert - butylperoxyisopropyl)benzene, triallyl isocyanurate, antioxidant 1010, and antioxidant 168 is 100:30 - 70:0.3 - 1.2:0.1 - 0.6:2:

1.

5. The preparation method of a special cable for ocean-going ships according to claim 1, characterized in that In step (2), the length of the alumina fiber is 0.1 - 1 mm.

6. The preparation method of a special cable for ocean-going ships according to claim 1, characterized in that, In step (2), the kneading temperature is 90 - 125 °C and the time is 30 - 70 min.

7. The preparation method of a special cable for ocean-going ships according to claim 1, characterized in that, In step (2), the process parameters of the electron beam irradiation: the irradiation energy is 1.5 MeV and the dose is 100 - 200 kGy.

8. The preparation method of a special cable for ocean-going ships according to claim 1, wherein In step (2), the mass ratio of intermediate A, alumina fiber, and phosphate glass powder is 80:10 - 20:15 - 30.

9. The preparation method of a special cable for ocean-going ships according to claim 1, characterized in that, In step (3), the thickness of the shielding layer is 0.5 - 2 mm, and the thickness of the protective layer is 2 - 5 mm.

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