High-strength flame-retardant polyethylene cable material and preparation method thereof

Abstract

The invention provides a high-strength flame-retardant polyethylene cable material and a preparation method thereof, and relates to the technical field of preparation of flame-retardant polyethylene cable materials. Comprising the following steps: S1, preparing a compatibilizer; s2, preparing a modified flame retardant; and S3, preparing the high-strength flame-retardant polyethylene cable material: uniformly mixing low-density polyethylene, the compatibilizer and the modified Al2O3 / SiO2 blended particles, plasticizing, reacting, extruding and granulating to obtain the high-strength flame-retardant polyethylene cable material. The prepared polyethylene cable material has excellent mechanical properties and also has excellent flame retardance.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of flame-retardant polyethylene cable materials, and particularly relates to a high-strength flame-retardant polyethylene cable material and a preparation method thereof. Background Art

[0002] Electric wires and cables are composed of bare wire products and insulating layers, and the material used to prepare the insulating layer is commonly known as cable material. At present, cable materials are mainly prepared from polyethylene as the matrix resin material because polyethylene has outstanding electrical insulation properties, excellent mechanical properties and processing properties. However, electric wires and cables may catch fire during use, and in order to avoid fire accidents during the use of electric wires and cables, it is necessary to improve the flame retardancy of electric wires and cables. However, the flame retardancy of polyethylene is poor and cannot meet the market requirements for flame-retardant cable materials.

[0003] Adding a halogen-free flame retardant to the polyethylene matrix resin material is a common method to improve the flame retardancy of polyethylene cable materials. Currently, commonly used halogen-free flame retardants include hydrotalcite, magnesium hydroxide, aluminum hydroxide, or oxides of iron, cobalt, nickel, copper, and zinc. Adding a halogen-free flame retardant can improve the flame retardancy of polyethylene cable materials. However, because the amount of halogen-free flame retardant is generally large, and polyethylene is a non-polar polymer material with poor compatibility with the flame retardant, the mechanical properties of polyethylene cable materials decrease. If its dispersion in polyethylene is not good, the mechanical properties of the flame-retardant polyethylene cable materials will decrease more, and the tensile strength and elongation at break are significantly lower than those of the cable materials without adding a flame retardant, affecting the service life of the flame-retardant polyethylene cable materials. Therefore, developing a high-strength flame-retardant polyethylene has become a technical problem urgently to be solved in this field. Summary of the Invention

[0004] (I) Technical Problems to be Solved Aiming at the deficiencies of the prior art, the present invention provides a high-strength flame-retardant polyethylene cable material and a preparation method thereof, and solves the technical problem that the tensile strength and elongation at break of the existing flame-retardant polyethylene cable materials are significantly lower than those of the polyethylene cable materials without adding a flame retardant.

[0005] (II) Technical Solutions To achieve the above objectives, the present invention is realized through the following technical solutions: In the first aspect, the present invention provides a preparation method of a high-strength flame-retardant polyethylene cable material, including the following steps: S1. Prepare a compatibilizer Mix ethyl acrylate and methyl methacrylate to prepare a mixed monomer, then disperse a first initiator in the mixed monomer to form an initiator monomer solution, and mix linear low-density polyethylene and the initiator monomer solution evenly at room temperature, and then make it through plasticization, reaction, and extrusion to obtain a compatibilizer.

[0006] S2. Preparation of modified flame retardant Surface treatment of Al2O3 and SiO2 with a silane coupling agent to obtain Al2O3 / SiO2 blended particles; treating the Al2O3 / SiO2 blended particles with monoalkenyl polyol ester under a second initiator to obtain modified Al2O3 / SiO2 blended particles; S3. Preparation of high-strength flame-retardant polyethylene cable material Mix low-density polyethylene, the compatibilizer, and the modified Al2O3 / SiO2 blended particles evenly, and through plasticization, reaction, extrusion, and pelletizing, obtain high-strength flame-retardant polyethylene cable material.

[0007] The preparation method of the above high-strength flame-retardant polyethylene cable material selects ethyl acrylate, methyl methacrylate, and linear low-density polyethylene to prepare the compatibilizer, and uses a silane coupling agent and monoalkenyl polyol ester to modify Al2O3 and SiO2 to obtain modified Al2O3 / SiO2 blended particles. Under the synergistic effect of the compatibilizer and the modified Al2O3 / SiO2 blended particles, the prepared polyethylene cable material has excellent mechanical properties and excellent flame retardancy at the same time.

[0008] Preferably, the mass ratio of ethyl acrylate to methyl methacrylate is 1-5:5-9.

[0009] Controlling the mass ratio of ethyl acrylate to methyl methacrylate within a suitable range can take into account the flame retardancy and mechanical properties of the polyethylene cable material.

[0010] Preferably, the mass ratio of linear low-density polyethylene, ethyl acrylate to methyl methacrylate is 28-32:1-5:5-9.

[0011] Controlling the mass ratio of linear low-density polyethylene, ethyl acrylate to methyl methacrylate within a suitable range can take into account the flame retardancy and mechanical properties of the polyethylene cable material.

[0012] Preferably, the silane coupling agent is selected from γ-methacryloxypropyltrimethoxysilane or vinyltriethoxysilane.

[0013] Preferably, the mass ratio of the Al2O3 / SiO2 blended particles to monoalkenyl polyol ester is 8-12:0.5-1.5.

[0014] Controlling the mass ratio of the Al2O3 / SiO2 blended particles to monoalkenyl polyol ester within a suitable range enables the modified Al2O3 / SiO2 blended particles and the compatibilizer to play a synergistic role, reducing the degree of reduction of the mechanical properties of the polyethylene cable material by Al2O3 and SiO2.

[0015] Preferably, the monoalkenyl polyol ester is selected from methacrylyl polyol ester or acrylyl polyol ester.

[0016] Preferably, the mass ratio of the S3 low-density polyethylene, compatibilizer, and modified Al2O3 / SiO2 blend particles is 100 - 120:30 - 40:5 - 15.

[0017] Controlling the mass ratio of the low-density polyethylene, compatibilizer, and modified Al2O3 / SiO2 blend particles within a suitable range enables the modified Al2O3 / SiO2 blend particles and the compatibilizer to exert a synergistic effect, reducing the degree of reduction in the mechanical properties of the polyethylene cable material caused by Al2O3 and SiO2.

[0018] Preferably, the first initiator is dicumyl peroxide and the second initiator is ammonium persulfate.

[0019] In a second aspect, the present invention provides a high-strength flame-retardant polyethylene cable material prepared by the preparation method described in the first aspect. The oxygen index of the high-strength flame-retardant polyethylene cable material is 31 - 33%.

[0020] Preferably, the high-strength flame-retardant polyethylene cable material has a tensile strength of 20 - 23 MPa and an elongation at break of 670 - 700%.

[0021] The above high-strength flame-retardant polyethylene cable material includes a compatibilizer and modified Al2O3 / SiO2 blend particles. The modified Al2O3 / SiO2 blend particles and the compatibilizer exert a synergistic effect, reducing the degree of reduction in the mechanical properties of the polyethylene cable material caused by Al2O3 and SiO2, as well as having excellent flame retardancy. Specific Embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] By providing a high-strength flame-retardant polyethylene cable material and its preparation method, the embodiments of the present application solve the technical problem that the tensile strength and elongation at break of the existing flame-retardant polyethylene cable material are significantly reduced compared to the polyethylene cable material without a flame retardant, and improve the service life of the flame-retardant polyethylene cable material.

[0024] The general idea of the technical solutions in the embodiments of the present application to solve the above technical problems is as follows:

Preparation Method of High-Strength Flame-Retardant Polyethylene Cable Material

[0025] S2. Prepare a modified flame retardant Use a silane coupling agent to perform surface treatment on Al2O3 and SiO2 to obtain Al2O3 / SiO2 blended particles; Treat the Al2O3 / SiO2 blended particles with monoalkenyl polyol ester under a second initiator to obtain modified Al2O3 / SiO2 blended particles; S3. Prepare a high-strength flame-retardant polyethylene cable material Mix low-density polyethylene, the compatibilizer, and the modified Al2O3 / SiO2 blended particles evenly, and through plasticization, reaction, extrusion, and granulation, obtain a high-strength flame-retardant polyethylene cable material.

[0026] In this article, the term "normal temperature conditions" refers to 10-30°C and 1 standard atmosphere.

[0027] In this article, the term "linear low-density polyethylene" is obtained by copolymerizing ethylene monomer and a small amount of d-olefin under low pressure using a Ziegler-Natta catalyst. Its crystallinity is 50%-55%, and its density is 0.910-0.940 g / cm 3 , and its molecular weight is 10,000-50,000.

[0028] In this article, the term "low-density polyethylene" is a high-molecular-weight polyethylene polymerized by ethylene under high temperature and high pressure through a free radical mechanism. Its molecular weight is 200,000-300,000, and it is a milky white, odorless, tasteless, non-toxic, waxy particle with no luster on the surface.

[0029] In some embodiments, the mass ratio of ethyl acrylate to methyl methacrylate-2 is 3:7, 5:5, 1:9, 4:6, 2:8, or any value therebetween.

[0030] In some embodiments, the mass ratio of linear low-density polyethylene, ethyl acrylate to methyl methacrylate-2 is 28:3:7, 29:5:5, 30:1:9, 31:4:6, 32:2:8, or any value therebetween.

[0031] In some embodiments, the silane coupling agent is selected from γ-methacryloxypropyltrimethoxysilane or vinyltriethoxysilane.

[0032] In some embodiments, the mass ratio of the Al2O3 / SiO2 blended particles to the mono-vinyl polyol ester is 8 - 12:0.5 - 1.5.

[0033] In some embodiments, the mono-vinyl polyol ester is selected from methylpropenyl polyol ester or propenyl polyol ester.

[0034] In some embodiments, the mass ratio of the S3 low-density polyethylene, the compatibilizer, and the modified Al2O3 / SiO2 blended particles is 100:30:5, 110:35:10, 120:40:15, or any value therebetween.

[0035] In some embodiments, the first initiator is dicumyl peroxide and the second initiator is ammonium persulfate.

[0036]

High-strength flame-retardant polyethylene cable material

[0037] The oxygen index of the high-strength flame-retardant polyethylene cable material can be tested by methods and equipment known in the art. As an example: Select an oxygen index tester to test the oxygen index of the high-strength flame-retardant polyethylene cable material. Select the initial oxygen concentration. If the specimen burns rapidly, select an initial oxygen concentration of about 18% (volume fraction); if the specimen burns slowly or unstably, select an initial oxygen concentration of about 21% (volume fraction); if the specimen does not burn continuously in air, select an initial oxygen concentration of at least 25% (volume fraction). Equipment model: WK5155A digital display oxygen index tester, produced by Suzhou Wellkuny Testing Instruments Co., Ltd.

[0038] In some embodiments, the high-strength flame-retardant polyethylene cable material has a tensile strength of 20 - 23 MPa and an elongation at break of 670 - 700%.

[0039] The tensile strength and elongation at break of the high-strength flame-retardant polyethylene cable material can be tested by methods known in the art. As an example: For example, test the high-strength flame-retardant polyethylene cable material in accordance with GB / T 1040.3 - 2006, and the test equipment can be a tensile property tester (such as the Driec horizontal plastic tensile property tester DRK-WL101).

[0040] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with specific embodiments.

[0041] I. Preparation method Example 1

[0042] This embodiment provides a method for preparing a high-strength flame-retardant polyethylene cable material, which includes the following steps: S1. Prepare a compatibilizer Mix 3 kg of ethyl acrylate and 7 kg of methyl methacrylate to prepare a mixed monomer, and then disperse 0.3 kg of initiator dicumyl peroxide in the mixed monomer to form an initiator monomer solution. Use a loss-in-weight feeder to feed 30 kg of linear low-density polyethylene into the first section of a twin-screw extruder, and inject the initiator monomer solution into the co-rotating twin-screw extruder through a metering pump. The screw diameter of this co-rotating twin-screw extruder is 20 mm, the length-diameter ratio is 40 / 1, and there are 11 sections from the feeding port to the die. Add materials in the first section, and under normal temperature conditions, mix the linear low-density polyethylene and the initiator monomer solution evenly. The temperatures of the 2nd - 11th sections of the extruder are 150 °C, 160 °C, 180 °C, 180 °C, 200 °C, 220 °C, 220 °C, 220 °C, 220 °C, and 220 °C respectively, and the screw speed is set at 220 r / min. The linear low-density polyethylene particles and the initiator monomer solution are mixed, plasticized, reacted, and extruded to produce 40 kg of compatibilizer.

[0043] S2. Prepare a modified flame retardant Add 20 kg of nano - Al2O3 dispersion, 40 kg of nano - SiO2 dispersion, and 20 kg of deionized water into a reaction kettle, and stir at a speed of 850 r / min for dilution to obtain a nano - Al2O3 - SiO2 dispersion; Take 0.6 kg of silane coupling agent and add it to water, and adjust its pH = 4; Slowly drip the silane coupling agent solution with adjusted pH into the nano - Al2O3 - SiO2 dispersion, and continue to stir for 4 h to obtain a mixed slurry; Centrifuge and filter the obtained mixed slurry, and the filtrate is vacuum dried at 100 °C for 12 h to obtain 12.2 kg of Al2O3 / SiO2 blend particles. The solid content of both the nano - Al2O3 dispersion and the nano - SiO2 dispersion is 20%, the particle size of the nano - particles in the nano - Al2O3 dispersion is 20 nm, and the particle size of the nano - particles in the nano - SiO2 dispersion is 30 nm.

[0044] Take 10 kg of Al2O3 / SiO2 blend particles and mix and stir them with water, pour the suspension into a reaction kettle, adjust the temperature to 40 °C, continuously introduce nitrogen into the reaction device for about 30 minutes to remove the oxygen in the device, and at the same time, continuously stir with a strong stirrer to make the reaction system heat and mix evenly. Add 0.6 kg of initiator ammonium persulfate and continue to stir for 5 min, then add 1 kg of methylallyl polyol ester, and react at 70 °C for 5 h. After drying the reaction solution, 11.2 kg of modified Al2O3 / SiO2 blend particles, that is, the modified flame retardant, are obtained.

[0045] S3. Prepare a high-strength flame-retardant polyethylene cable material Use a loss-in-weight feeder to feed 110 kg of low-density polyethylene, 35 kg of compatibilizer, and 0.3 kg of BaO₂ into the first section of the twin-screw extruder. Mix them evenly at 1000 r / min and 90 °C and then enter the second section. Feed 10 kg of the above-mentioned modified Al₂O₃ / SiO₂ blend particles into the third section. After stirring evenly at 1000 r / min, add 2.5 kg of lubricant and 2.5 kg of antioxidant while maintaining the temperature. Continue to stir and mix evenly at 1000 r / min to obtain a mixture, and then extrude and pelletize to obtain a high-strength flame-retardant polyethylene cable material. The temperatures of the 2nd to 11th sections of the extruder are 130 °C, 140 °C, 180 °C, 180 °C, 200 °C, 220 °C, 220 °C, 220 °C, 220 °C, and 220 °C respectively.

[0046] Example 2-6 In Example 2-6, adjust the dosage of the raw materials for preparing the compatibilizer, and the others are the same as in Example 1. The specific parameters are shown in Table 1.

[0047] Table 1 Preparation Parameters of Compatibilizer in Examples and Comparative Examples Ethyl acrylate Methyl methacrylate Di(2,4-dichlorobenzoyl) peroxide Linear low density polyethylene Example 1 3 7 0.3 30 Example 2 10 0 0.3 30 Example 3 6 4 0.3 30 Example 4 5 5 0.3 30 Example 5 1 9 0.3 30 Example 6 0 10 0.3 30 Comparative Example 1 3 7 0.3 30 Comparative Example 2 / / / / Comparative Example 3 3 7 0.3 30

[0048] Comparative Example 1 The difference between this comparative example and Example 1 is that in S2, silane coupling agent and methacryloyl polyol ester are not used to modify the nano-Al₂O₃ dispersion and nano-SiO₂ dispersion, that is: add 20 kg of nano-Al₂O₃ dispersion, 40 kg of nano-SiO₂ dispersion, and 20 kg of deionized water into the reaction kettle, and stir at a speed of 850 r / min for dilution to obtain nano-Al₂O₃-SiO₂ dispersion; centrifuge and filter the obtained nano-Al₂O₃-SiO₂ dispersion, and vacuum dry the filtrate at 100 °C for 12 h to obtain 12 kg of Al₂O₃ / SiO₂ blend particles. Take 10 kg of Al₂O₃ / SiO₂ blend particles to replace the modified Al₂O₃ / SiO₂ blend particles in S3, and the others are the same as in Example 1 to prepare a polyethylene cable material.

[0049] Comparative Example 2 The difference between this comparative example and Example 1 is that it does not include S1, and no compatibilizer is added in S3, that is: in S3, use a loss-in-weight feeder to feed 145 kg of low-density polyethylene (LDPE) and 0.3 kg of BaO₂ into the first section of the twin-screw extruder. Mix them evenly at 1000 r / min and 90 °C and then enter the second section. Feed 10 kg of modified Al₂O₃ / SiO₂ blend particles into the third section, and the others are the same as in Example 1 to prepare a polyethylene cable material.

[0050] Comparative Example 3 The difference between this comparative example and Example 1 is that S2 is not included, and no flame retardant is added in S3, that is: in S3, a loss-in-weight feeder is used to feed 110 kg of low-density polyethylene and 35 kg of compatibilizer into the first section of the twin-screw extruder, and they are mixed evenly at 1000 r / min and 90 °C. Then, 2.5 kg of lubricant and 2.5 kg of antioxidant are added while maintaining the temperature, and the mixture is continuously stirred and mixed evenly at 1000 r / min to obtain a mixed material, which is then extruded and pelletized to obtain polyethylene cable material. The temperatures of the 2nd to 11th sections of the extruder are 130 °C, 140 °C, 180 °C, 180 °C, 200 °C, 220 °C, 220 °C, 220 °C, 220 °C and 220 °C respectively. Other conditions are the same as those in Example 1, and polyethylene cable material is prepared.

[0051] II. Test Methods The properties of the cable materials prepared in Examples 1-6 and Comparative Examples 1-3 were tested. The test methods are shown in Table 2.

[0052] Table 2 Test Methods for the Properties of Cable Materials Item Test method Unit Oxygen index GB / T 2406.2-2009 % Tensile strength GB / T 1040.3-2006 Mpa Elongation at break GB / T 1040.3-2006 %

[0053] III. Test Results The test results of the properties of the cable materials prepared in Examples 1-6 and Comparative Examples 1-3 are shown in Table 3.

[0054] Table 3 Test Results of the Properties of Cable Materials Oxygen index Tensile strength Elongation at break Example 1 32 21.8 680.5 Example 2 25 27.5 732.4 Example 3 27 25.3 725.3 Example 4 31 22.2 693.8 Example 5 33 20.0 677.4 Example 6 34 15.5 560.7 Comparative Example 1 25 10.2 320.3 Comparative Example 2 31 12.6 356.2 Comparative Example 3 17 28.3 755.9

[0055] As can be seen from Table 3, the preparation method of the polyethylene cable compound in Examples 1-6 of the present application includes selecting ethyl acrylate, methyl methacrylate, and linear low-density polyethylene to prepare a compatibilizer, and using a silane coupling agent and methylallyl polyol ester to modify nano-Al2O3 and nano-SiO2 to obtain modified Al2O3 / SiO2 blended particles. Comparing Comparative Example 3 with Comparative Example 1, it can be seen that adding unmodified flame retardant significantly reduces the mechanical properties of the polyethylene cable compound. However, comparing Comparative Example 3 with Example 1, it can be seen that adding the modified flame retardant of the present application significantly reduces the degree of reduction in the mechanical properties of the polyethylene cable compound. Compared with Example 1, the tensile strength and elongation at break of the polyethylene cable compounds described in Comparative Examples 1 and 2 are significantly reduced. It can be seen that whether the modification step of the flame retardant Al2O3 / SiO2 blended particles is omitted or the compatibilizer is omitted, the tensile strength and elongation at break of the polyethylene cable compound cannot reach the level of Example 1, indicating that in the preparation method of the polyethylene cable compound of the present application, the compatibilizer and the modified Al2O3 / SiO2 blended particles have a synergistic effect in improving the mechanical properties of the polyethylene cable compound. Therefore, the degree of reduction in the mechanical properties of the polyethylene cable compound prepared in the present application is significantly reduced, and at the same time, it has excellent flame retardant properties. Comparing Examples 1, 4, and 5 with Examples 2, 3, and 6, it can be seen that controlling the mass ratio of ethyl acrylate to methyl methacrylate to be 1-5:5-9 can balance the flame retardancy and mechanical properties of the polyethylene cable compound.

[0056] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0058] The present invention illustrates the detailed process flow of the present invention through the above embodiments, but the present invention is not limited to the above detailed process flow, that is, it does not mean that the present invention must rely on the above detailed process flow to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of each raw material of the present invention's product, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A method for preparing a high-strength flame-retardant polyethylene cable material, characterized in that: The steps include: S1. Preparation of Compatibilizer Ethyl acrylate and 2-methyl methacrylate are mixed to prepare a mixed monomer, and then a first initiator is dispersed in the mixed monomer to prepare an initiator monomer solution, and linear low-density polyethylene and the initiator monomer solution are uniformly mixed at room temperature, and a compatibilizer is prepared through plasticization, reaction, and extrusion; S2. Preparation of modified flame retardant Surface treatment of Al2O3 and SiO2 is performed using a silane coupling agent to obtain Al2O3 / SiO2 blended particles; treating the Al2O3 / SiO2 blended particles with a monoolefin polyol ester in the presence of a second initiator to obtain modified Al2O3 / SiO2 blended particles; S3. Preparation of high-strength flame-retardant polyethylene cable materials The low-density polyethylene, the compatibilizer and the modified Al2O3 / SiO2 blended particles are uniformly mixed, and subjected to plasticization, reaction, extrusion and granulation to obtain a high-strength flame-retardant polyethylene cable material.

2. The preparation method according to claim 1, characterized in that The mass ratio of the ethyl acrylate to the methyl 2-methacrylate is 1-5:5-9.

3. The preparation method according to claim 1, characterized in that: The mass ratio of the linear low-density polyethylene, ethyl acrylate and 2-methyl methacrylate is 28-32:1-5:5-9.

4. The preparation method according to claim 1, characterized in that: The silane coupling agent is selected from γ-methacryloxypropyltrimethoxysilane or vinyltriethoxysilane.

5. The preparation method according to claim 1, characterized in that: The mass ratio of the Al2O3 / SiO2 blended particles to the monoolefin polyol ester is 8-12:0.5-1.

5.

6. The preparation method according to claim 1, characterized in that: The monoalkenyl polyol ester is selected from methacrylic polyol ester or acrylic polyol ester.

7. The preparation method according to claim 1, characterized in that: The mass ratio of the low-density polyethylene, the compatibilizer, and the modified Al2O3 / SiO2 blended particles is 100-120:30-40:5-15.

8. The preparation method according to claim 1, characterized in that: The first initiator is dipentadiene and the second initiator is ammonium persulfate.

9. A high-strength flame-retardant polyethylene cable material prepared by the preparation method according to any one of claims 1 to 8, characterized in that: The high-strength flame-retardant polyethylene cable material has an oxygen index of 31-33%.

10. The high-strength flame-retardant polyethylene cable material according to claim 9, characterized in that: The high-strength flame-retardant polyethylene cable material has a tensile strength of 20-23 MPa and an elongation at break of 670-700%.