Marine polyethylene insulated cable material and preparation method thereof

Abstract

The invention discloses a marine polyethylene insulated cable material and a preparation method thereof, and relates to the technical field of cable materials. According to the invention, the p-hydroxycinnamyl alcohol modified low-density polyethylene is taken as a core, and a rigid benzene ring is introduced, so that the anti-aging performance and the mechanical performance of the polyethylene cable material are remarkably improved; then polyimide is attracted by hydroxyl to coat the surface of the cable, so that the waterproof and corrosion-resistant performance of the cable is improved; and then blending with the modified filler and the 5-methoxy-2-methylphenol, so that the mechanical property of the cable is improved, and the corrosion resistance and the waterproof effect are realized at the same time. The modified filler takes prismatic barium sulfate particles as a raw material, so that the mechanical property of a polymer is remarkably improved, and the ageing resistance of the cable material is enhanced by matching with barium sulfate; and 4-methacryloxybenzophenone and ethylene are polymerized to form an anti-ultraviolet liquid with certain viscosity, and barium sulfate particles are in different orientations under ultrasonic oscillation by virtue of the viscosity of the anti-ultraviolet liquid, so that the mechanical property and photo-thermal aging resistance of the cable are improved.

Description

Technical Field

[0001] The invention relates to the technical field of cable materials, in particular to a marine polyethylene insulated cable material and a preparation method thereof. Background Art

[0002] In ship electrical systems, cables are key components for power and signal transmission, and their performance is directly related to the safe navigation and stable operation of the ship. The ship's operating environment is extremely complex, and cables are constantly exposed to harsh conditions such as high humidity, high salt spray, large temperature fluctuations, and mechanical friction. Polyethylene has been widely used as a marine cable insulation material due to its good processability, reasonable electrical insulation properties, and cost advantages. However, with the continuous development of marine technology, higher performance requirements for marine cables have been placed on them, and existing polyethylene insulation cable materials have gradually exposed shortcomings in many aspects.

[0003] At the same time, due to long-term exposure to the marine environment, the polyethylene insulation layer is susceptible to oxidative degradation due to the combined effects of ultraviolet rays, seawater erosion, and temperature changes. This not only leads to a decrease in its physical properties, such as reduced flexibility, but also deteriorates the insulation performance, seriously affecting the service life and reliability of the cable. Moreover, although polyethylene itself has certain insulation capabilities, under the special operating conditions of ships, especially in high humidity and high salt spray environments, the erosion of moisture and salt can easily form conductive pathways on the surface of the insulation layer, resulting in a decrease in insulation resistance and an increased risk of electrical failure. Moreover, as ship power systems develop towards high voltage and high power, the requirements for the insulation strength and corona resistance of cable insulation materials are more stringent, and existing polyethylene insulation cable materials can no longer meet these requirements. Summary of the Invention

[0004] The object of the present invention is to provide a polyethylene insulated cable material for ships and a preparation method thereof, so as to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a polyethylene insulated cable material for ships, characterized in that the polyethylene insulated cable material for ships is prepared by blending polyimide-coated p-hydroxycinnamyl alcohol-modified polyethylene, a modified filler, and 5-methoxy-2-methylphenol; the modified filler is prepared by mixing prismatic barium sulfate as a raw material with an anti-UV adhesive formed by polymerization of 4-methacryloyloxybenzophenone and ethylene under ultrasonic vibration; the polyethylene insulated cable material for ships comprises the following preparation steps:

[0006] (1) 31 to 53 parts of modified polyethylene are uniformly dispersed in 155 to 293 parts of dimethylformamide, 0.7 to 1.3 parts of nickel bromide, 17 to 29 parts of pyromellitic dianhydride, and 20 to 32 parts of p-phenylenediamine are added, the temperature is raised to 100°C, and the mixture is stirred at 200 rpm for 4 to 6 hours. After the reaction is completed, the mixture is naturally cooled to room temperature, transferred to a centrifuge and centrifuged at 7000 r / min for 5 to 15 minutes, the solid is collected, washed with ethanol three times, and dried in an oven at 25 to 35°C for 8 to 14 hours to obtain a coated modified polyethylene;

[0007] (2) adding 53 to 77 parts of prismatic barium sulfate to 8 to 12 parts of an anti-ultraviolet adhesive, stirring the mixture ultrasonically at an ultrasonic frequency of 20 to 25 kHz and a stirring speed of 110 rpm for 10 to 20 minutes, and crushing the mixture. Repeating the above process 1 to 2 times, the mixture was crushed until it passed through a 60-mesh sieve to obtain a modified filler.

[0008] (3) 75-85 parts of coated modified polyethylene, 12-18 parts of modified filler, 6-10 parts of 5-methoxy-2-methylphenol, and 2-4 parts of plasticizer are mixed in an internal mixer for 5-15 minutes, and the mixture is extruded and pelletized through an extruder to obtain marine polyethylene insulation cable material.

[0009] Furthermore, the preparation step of the modified polyethylene in step (1) is as follows: 15 to 21 parts of a polyethylene having a density of 0.91 to 0.93 g / m 3 The modified polyethylene is prepared by uniformly mixing low-density polyethylene, 3 to 7 parts of p-hydroxycinnamyl alcohol, and 0.1 part of a peroxide initiator, melting and blending at 125 to 135° C. for 30 to 60 minutes, and naturally cooling to room temperature.

[0010] Furthermore, the peroxide initiator is a mixture of any one or more of cumene hydroperoxide, dicumyl peroxide, and ammonium persulfate.

[0011] Furthermore, the particle size of the prismatic barium sulfate in step (2) is 100 to 200 nm.

[0012] Furthermore, the preparation steps of the anti-ultraviolet adhesive in step (2) are:

[0013] a. 1 to 3 parts of sodium lauryl sulfate and 0.5 to 1.5 parts of ammonium persulfate are added to 18 to 50 parts of deionized water and stirred until completely dissolved. Then, 15 to 45 parts of ethyl acrylate and 21 to 47 parts of 4-methacryloyloxybenzophenone are added and stirred to emulsify to obtain a pre-emulsion;

[0014] b. 2 to 6 parts of sodium lauryl sulfate, 1.5 to 3.5 parts of sodium bicarbonate, 30 to 80 parts of deionized water, and 15 to 45 parts of methanol were mixed uniformly, heated to 40 ° C, and the pre-emulsion was added dropwise at a rate of 1 mL / min. After the addition was completed, ethylene gas was introduced to the reactor pressure of 0.5 to 0.9 MPa, the temperature was set at 55 to 75 ° C, the stirring speed was 300 rpm, the reaction was carried out for 1.5 to 2.5 h, and the mixture was cooled to room temperature. The pH was adjusted to 7 to 9 with 2 mol / L of ammonia to obtain an anti-UV adhesive.

[0015] Furthermore, the plasticizer in step (3) is a mixture of any one or more of dioctyl phthalate, triphenyl phosphate, and dioctyl adipate.

[0016] Furthermore, the parameters of the extruder in step (3) are: extrusion temperature of 120-130°C, screw speed of 200-230 r / min, extrusion pressure of 10-18 MPa, shear rate of 180-210 s -1 .

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The invention uses low-density polyethylene modified with p-hydroxycinnamyl alcohol as a core, introduces a rigid benzene ring, increases the interaction force between molecular chains, makes the molecular chains less likely to slide relative to each other, and can better resist deformation, thereby exhibiting higher hardness, strength and modulus. In addition, the hydroxyl groups are used to attract compounds to be coated on the surface of the polyethylene cable material, thereby significantly improving the anti-aging performance of the polyethylene cable material. In addition, the presence of the coating layer prevents the intrusion of seawater media, thereby improving the waterproof and corrosion-resistant performance of the cable. The cable material is then melt-blended and combined with modified fillers and 5-methoxy-2-methylphenol, so that the interior of the blended and extruded cable material presents a network of high molecular aggregates, which improves the mechanical properties of the cable and forms a protective film with certain hydrophobicity, thereby preventing moisture and corrosive substances from contacting the internal material of the cable, thereby achieving corrosion resistance and waterproof effects.

[0019] The modified filler is made of prismatic barium sulfate particles. The prismatic particles have a structure similar to that of natural biominerals. Their small particle size and large specific surface area can play a role of dispersion, support and reinforcement in cable materials, effectively transfer stress, and hinder the movement of polymer molecular chains, thereby significantly improving the mechanical properties of the polymer. Combined with barium sulfate, it has good ultraviolet absorption ability, thereby enhancing the anti-aging performance of the cable material; then 4-methacryloyloxybenzophenone is polymerized with ethylene to form an anti-ultraviolet liquid with a certain viscosity, and relying on its viscosity, multiple barium sulfate particles are compounded, and ultrasonic vibration is applied during the compounding process to make the barium sulfate particles present in different directions, thereby giving full play to the stress transfer effect of barium sulfate and improving the mechanical properties of the cable. In addition, the benzophenone in the anti-ultraviolet liquid can absorb ultraviolet light, and the acyloxy group can capture free radicals, which synergize with barium sulfate to improve the cable's resistance to light and heat aging. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of the marine polyethylene insulated cable materials prepared in the following examples.

[0022] Tensile strength and elongation at break tests: The examples and comparative examples of the same mass were tested in accordance with the provisions of GB / T8804.2.

[0023] UV aging resistance test: The same mass of the embodiment and the comparative example were tested according to method A in GB / T16422.3-2014, with an irradiation time of 30 days.

[0024] Corrosion Resistance Test: Plastic block specimens of equal mass from the Example and Comparative Example were prepared. Three clean beakers were filled with 10% hydrochloric acid and 10% NaOH solutions, respectively. The specimens were immersed in each of the prepared solutions. After maintaining the sealed environment for 45 days, the specimens were removed and observed for surface corrosion.

[0025] Example 1: (1) 15 parts of a 0.91 g / m 3 Low-density polyethylene, 3 parts of p-hydroxycinnamyl alcohol, and 0.1 parts of cumene hydroperoxide were uniformly mixed, melt-blended at 125°C for 30 minutes, and naturally cooled to room temperature to obtain modified polyethylene;

[0026] (2) 31 parts of modified polyethylene were uniformly dispersed in 155 parts of dimethylformamide, 0.7 parts of nickel bromide, 17 parts of pyromellitic dianhydride, and 20 parts of p-phenylenediamine were added, the temperature was raised to 100°C, and the mixture was stirred at 200 rpm for 4 hours. After the reaction was completed, it was naturally cooled to room temperature, transferred to a centrifuge and centrifuged at 7000 r / min for 5 minutes. The solid was collected, washed with ethanol three times, and dried in an oven at 25°C for 8 hours to obtain a coated modified polyethylene;

[0027] (3) 1 part of sodium lauryl sulfate and 0.5 part of ammonium persulfate were added to 18 parts of deionized water, stirred until completely dissolved, and then 15 parts of ethyl acrylate and 21 parts of 4-methacryloyloxybenzophenone were added, and stirred and emulsified to prepare a pre-emulsion;

[0028] (4) 2 parts of sodium lauryl sulfate, 1.5 parts of sodium bicarbonate, 30 parts of deionized water, and 15 parts of methanol were mixed uniformly, heated to 40°C, and the pre-emulsion was added dropwise at a rate of 1 mL / min. After the addition was complete, ethylene gas was introduced to a pressure of 0.5 MPa in the autoclave, the temperature was set to 55°C, the stirring speed was 300 rpm, the reaction was carried out for 1.5 hours, and the mixture was naturally cooled to room temperature. The pH was adjusted to 7 with 2 mol / L ammonia water to prepare an anti-ultraviolet adhesive;

[0029] (5) 53 parts of prismatic barium sulfate with a particle size of 100 nm were added to 8 parts of an anti-UV binder, and ultrasonically stirred at an ultrasonic frequency of 20 kHz and a stirring speed of 110 rpm for 10 min, and then crushed. After repeating the above process once, the mixture was crushed to pass through a 60-mesh sieve to obtain a modified filler;

[0030] (6) 75 parts of coated modified polyethylene, 12 parts of modified filler, 6 parts of 5-methoxy-2-methylphenol, and 2 parts of dioctyl phthalate were mixed in an internal mixer for 5 minutes, and then extruded through an extruder at an extrusion temperature of 120°C, a screw speed of 200 r / min, an extrusion pressure of 10 MPa, and a shear rate of 180 s -1 The polyethylene insulation cable material for marine use is obtained by extrusion and pelletizing.

[0031] Example 2: (1) 18 parts of a density of 0.92 g / m 3 Low-density polyethylene, 5 parts of p-hydroxycinnamyl alcohol, and 0.1 parts of dicumyl peroxide were uniformly mixed, melt-blended at 130°C for 45 minutes, and naturally cooled to room temperature to obtain modified polyethylene;

[0032] (2) 42 parts of modified polyethylene were uniformly dispersed in 224 parts of dimethylformamide, 1.0 part of nickel bromide, 23 parts of pyromellitic dianhydride, and 26 parts of p-phenylenediamine were added, the temperature was raised to 100°C, and the mixture was stirred at 200 rpm for 5 hours. After the reaction was completed, it was naturally cooled to room temperature, transferred to a centrifuge and centrifuged at a speed of 7000 r / min for 10 minutes. The solid was collected, washed with ethanol three times, and dried in a 30°C oven for 11 hours to obtain a coated modified polyethylene;

[0033] (3) adding 2 parts of sodium lauryl sulfate and 1 part of ammonium persulfate to 34 parts of deionized water, stirring until completely dissolved, then adding 30 parts of ethyl acrylate and 34 parts of 4-methacryloyloxybenzophenone, stirring and emulsifying to prepare a pre-emulsion;

[0034] (4) 4 parts of sodium lauryl sulfate, 2.5 parts of sodium bicarbonate, 55 parts of deionized water, and 30 parts of methanol were mixed uniformly, heated to 40°C, and the pre-emulsion was added dropwise at a rate of 1 mL / min. After the addition was complete, ethylene gas was introduced to a pressure of 0.7 MPa in the autoclave. The temperature was set to 65°C and the stirring speed was 300 rpm. The reaction was carried out for 2 h, and the mixture was naturally cooled to room temperature. The pH was adjusted to 8 with 2 mol / L ammonia water to prepare an anti-ultraviolet adhesive.

[0035] (5) 65 parts of prismatic barium sulfate with a particle size of 150 nm were added to 10 parts of an anti-UV binder, and ultrasonically stirred at an ultrasonic frequency of 22.5 kHz and a stirring speed of 110 rpm for 15 min, and then crushed. After repeating the above process twice, the mixture was crushed to pass through a 60-mesh sieve to obtain a modified filler;

[0036] (6) 80 parts of coated modified polyethylene, 15 parts of modified filler, 8 parts of 5-methoxy-2-methylphenol, and 3 parts of triphenyl phosphate were mixed in an internal mixer for 10 minutes and then extruded through an extruder at an extrusion temperature of 125°C, a screw speed of 215 r / min, an extrusion pressure of 14 MPa, and a shear rate of 195 s -1 The polyethylene insulation cable material for marine use is obtained by extrusion and pelletizing.

[0037] Example 3: (1) 21 parts of a 0.93 g / m 3 Low-density polyethylene, 5 parts of p-hydroxycinnamyl alcohol, and 0.1 parts of ammonium persulfate were uniformly mixed, melt-blended at 135°C for 60 minutes, and naturally cooled to room temperature to obtain modified polyethylene;

[0038] (2) 53 parts of modified polyethylene were uniformly dispersed in 293 parts of dimethylformamide, 1.3 parts of nickel bromide, 29 parts of pyromellitic dianhydride, and 32 parts of p-phenylenediamine were added, the temperature was raised to 100°C, and the mixture was stirred at 200 rpm for 6 hours. After the reaction was completed, it was naturally cooled to room temperature, transferred to a centrifuge and centrifuged at a speed of 7000 r / min for 15 minutes. The solid was collected, washed with ethanol three times, and dried in a 35°C oven for 14 hours to obtain a coated modified polyethylene;

[0039] (3) adding 3 parts of sodium lauryl sulfate and 1.5 parts of ammonium persulfate to 50 parts of deionized water, stirring until completely dissolved, then adding 45 parts of ethyl acrylate and 47 parts of 4-methacryloyloxybenzophenone, stirring and emulsifying to prepare a pre-emulsion;

[0040] (4) 6 parts of sodium lauryl sulfate, 3.5 parts of sodium bicarbonate, 80 parts of deionized water, and 45 parts of methanol were mixed uniformly, heated to 40°C, and the pre-emulsion was added dropwise at a rate of 1 mL / min. After the addition was complete, ethylene gas was introduced to a pressure of 0.9 MPa in the autoclave. The temperature was set to 75°C and the stirring speed was 300 rpm. The reaction was carried out for 2.5 hours, and the mixture was naturally cooled to room temperature. The pH was adjusted to 9 with 2 mol / L ammonia water to prepare an anti-ultraviolet adhesive.

[0041] (5) 77 parts of prismatic barium sulfate with a particle size of 200 nm was added to 12 parts of an anti-UV binder, and ultrasonic stirring was performed at an ultrasonic frequency of 25 kHz and a stirring speed of 110 rpm for 20 min, and the mixture was crushed. After repeating the above process once, the mixture was crushed until it passed through a 60-mesh sieve to obtain a modified filler;

[0042] (6) 85 parts of coated modified polyethylene, 18 parts of modified filler, 10 parts of 5-methoxy-2-methylphenol, and 4 parts of dioctyl adipate were mixed in an internal mixer for 15 minutes, and then extruded through an extruder at an extrusion temperature of 130°C, a screw speed of 230 r / min, an extrusion pressure of 18 MPa, and a shear rate of 210 s -1 The polyethylene insulation cable material for marine use is obtained by extrusion and pelletizing.

[0043] Comparative Example 1: The difference between Comparative Example 1 and Example 2 is that the low-density polyethylene is not modified with p-hydroxycinnamyl alcohol. The remaining steps are the same as those in Example 2.

[0044] Comparative Example 2: The difference between Comparative Example 2 and Example 2 is that pyromellitic dianhydride and p-phenylenediamine are not added in step (2). The remaining steps are the same as in Example 2.

[0045] Comparative Example 3: The difference between Comparative Example 3 and Example 2 is that there is no step (2), and step (1) is changed to: 18 parts of a density of 0.92 g / m 3Low-density polyethylene, 5 parts of p-hydroxycinnamyl alcohol, 15 parts of polyimide with a molecular weight of 50,000, and 0.1 parts of diisopropyl peroxide are mixed evenly, melt-blended at 130°C for 45 minutes, and naturally cooled to room temperature to obtain modified polyethylene; step (6) is changed to: 80 parts of modified polyethylene, 15 parts of modified filler, 8 parts of 5-methoxy-2-methylphenol, and 3 parts of triphenyl phosphate are mixed in an internal mixer for 10 minutes, and extruded through an extruder at an extrusion temperature of 125°C, a screw speed of 215r / min, an extrusion pressure of 14MPa, and a shear rate of 195s -1 The remaining steps are the same as those in Example 2.

[0046] Comparative Example 4: The difference between Comparative Example 4 and Example 2 is that 5-methoxy-2-methylphenol is not added during the blending and pelletizing in step (6). The remaining steps are the same as those in Example 2.

[0047] Comparative Example 5: The difference between Comparative Example 5 and Example 2 is that there is no step (4), and step (6) is changed to: 85 parts of coated modified polyethylene, 10 parts of 5-methoxy-2-methylphenol, and 4 parts of dioctyl adipate are mixed in an internal mixer for 15 minutes, and then extruded by an extruder at an extrusion temperature of 130°C, a screw speed of 230r / min, an extrusion pressure of 18MPa, and a shear rate of 210s -1 The remaining steps are the same as those in Example 2.

[0048] Comparative Example 6: The difference between Comparative Example 6 and Example 2 is that 4-methacryloyloxybenzophenone is not added to the anti-ultraviolet adhesive. The remaining steps are the same as Example 2.

[0049] Effect Examples

[0050] Table 1 below shows the performance analysis results of marine polyethylene insulated cable materials using Examples 1 to 3 of the present invention and Comparative Examples 1 to 6.

[0051] Table 1

[0052]

[0053] From the comparison of the experimental data of Examples 1, 2, and 3 with those of Comparative Example 1, it can be found that the low-density polyethylene is modified by hydroxycinnamyl alcohol, a rigid benzene ring is introduced, the interaction force between the molecular chains is increased, the molecular chains are more difficult to slide relative to each other, deformation can be better resisted, higher hardness, strength and modulus are exhibited, and hydroxyl groups are introduced to provide reaction sites; from the comparison of the experimental data of Examples 1, 2, and 3 with those of Comparative Examples 2 and 3, it can be found that polyimide is coated on its surface, which significantly improves the anti-aging properties of the polyethylene cable material, and the polyimide layer as a shell layer prevents the intrusion of seawater medium, thereby improving the waterproof and corrosion resistance of the cable; from the comparison of the experimental data of Examples 1, 2, and 3 with Comparative Example 4, it can be found that by coating the modified polyethylene and blending it with 5-methoxy-2-methylphenol, the interior of the blended and extruded cable material is a mesh-like polymer aggregate, which improves the mechanical properties of the cable while forming a protective film with a certain hydrophobicity to prevent moisture and corrosive substances from contacting the internal materials of the cable, thereby achieving corrosion resistance. and waterproof effect; from the comparison of the experimental data of Examples 1, 2, and 3 with Comparative Example 5, it can be found that the prismatic particles have a structure similar to natural biominerals, and their smaller particle size and larger specific surface area can play a role of dispersion support and reinforcement in the cable material, effectively transfer stress, hinder the movement of polymer molecular chains, and significantly improve the mechanical properties of the polymer. The combination with barium sulfate has good ultraviolet absorption capacity, which enhances the anti-aging performance of the cable material; from the comparison of the experimental data of Examples 1, 2, and 3 with Comparative Example 6, it can be found that 4-methacryloyloxybenzophenone is polymerized with ethylene to form an anti-UV liquid with a certain viscosity, and relying on its viscosity, multiple barium sulfate particles are compounded, and ultrasonic vibration is applied during the compounding process to make the barium sulfate particles in different orientations, thereby giving full play to the stress transfer effect of barium sulfate and improving the mechanical properties of the cable. In addition, the benzophenone in the anti-UV liquid can absorb ultraviolet light, and the acyloxy group can capture free radicals, synergistically acting with barium sulfate to improve the light and heat aging resistance of the cable.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A polyethylene insulated cable material for ships, characterized in that: The marine polyethylene insulated cable material is prepared by blending polyimide-coated p-hydroxycinnamyl alcohol-modified polyethylene, a modified filler, and 5-methoxy-2-methylphenol; the modified filler is prepared by mixing prismatic barium sulfate as a raw material with an anti-UV adhesive formed by polymerization of 4-methacryloyloxybenzophenone and ethylene under ultrasonic vibration; the marine polyethylene insulated cable material comprises the following preparation steps: (1) 31 to 53 parts of modified polyethylene are uniformly dispersed in 155 to 293 parts of dimethylformamide, 0.7 to 1.3 parts of nickel bromide, 17 to 29 parts of pyromellitic dianhydride, and 20 to 32 parts of p-phenylenediamine are added, the temperature is raised to 100°C, and the mixture is stirred at 200 rpm for 4 to 6 hours. After the reaction is completed, the mixture is naturally cooled to room temperature, transferred to a centrifuge and centrifuged at 7000 r / min for 5 to 15 minutes, the solid is collected, washed with ethanol three times, and dried in an oven at 25 to 35°C for 8 to 14 hours to obtain a coated modified polyethylene; (2) adding 53 to 77 parts of prismatic barium sulfate to 8 to 12 parts of an anti-ultraviolet adhesive, stirring the mixture ultrasonically at an ultrasonic frequency of 20 to 25 kHz and a stirring speed of 110 rpm for 10 to 20 minutes, and crushing the mixture. Repeating the above process 1 to 2 times, the mixture was crushed until it passed through a 60-mesh sieve to obtain a modified filler. (3) 75-85 parts of coated modified polyethylene, 12-18 parts of modified filler, 6-10 parts of 5-methoxy-2-methylphenol, and 2-4 parts of plasticizer are mixed in an internal mixer for 5-15 minutes, and the mixture is extruded and pelletized through an extruder to obtain marine polyethylene insulation cable material.

2. The method for preparing a polyethylene insulated cable material for marine use according to claim 1, wherein: The preparation steps of the modified polyethylene in step (1) are as follows: 15 to 21 parts of a polyethylene having a density of 0.91 to 0.93 g / m 3 The modified polyethylene is prepared by uniformly mixing low-density polyethylene, 3 to 7 parts of p-hydroxycinnamyl alcohol, and 0.1 part of a peroxide initiator, melting and blending at 125 to 135° C. for 30 to 60 minutes, and naturally cooling to room temperature.

3. A polyethylene insulated cable material for ships according to claim 1, characterized in that: The particle size of the prismatic barium sulfate in step (2) is 100 to 200 nm.

4. A polyethylene insulated cable material for ships according to claim 1, characterized in that: The preparation steps of the anti-ultraviolet adhesive in step (2) are as follows: a. 1 to 3 parts of sodium lauryl sulfate and 0.5 to 1.5 parts of ammonium persulfate are added to 18 to 50 parts of deionized water and stirred until completely dissolved. Then, 15 to 45 parts of ethyl acrylate and 21 to 47 parts of 4-methacryloyloxybenzophenone are added and stirred to emulsify to obtain a pre-emulsion; b. 2 to 6 parts of sodium lauryl sulfate, 1.5 to 3.5 parts of sodium bicarbonate, 30 to 80 parts of deionized water, and 15 to 45 parts of methanol were mixed uniformly, heated to 40 ° C, and the pre-emulsion was added dropwise at a rate of 1 mL / min. After the addition was completed, ethylene gas was introduced to the reactor pressure of 0.5 to 0.9 MPa, the temperature was set at 55 to 75 ° C, the stirring speed was 300 rpm, the reaction was carried out for 1.5 to 2.5 h, and the mixture was cooled to room temperature. The pH was adjusted to 7 to 9 with 2 mol / L of ammonia to obtain an anti-UV adhesive.

5. A polyethylene insulated cable material for ships according to claim 1, characterized in that: The plasticizer in step (3) is a mixture of any one or more of dioctyl phthalate, triphenyl phosphate, and dioctyl adipate.

6. A polyethylene insulated cable material for ships according to claim 1, characterized in that: The parameters of the extruder in step (3) are: extrusion temperature of 150-205°C, screw speed of 200-230 r / min, extrusion pressure of 10-18 MPa, shear rate of 180-210 s -1 .

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