Railway special aluminum alloy power cable and preparation method thereof

Abstract

The application discloses a preparation method of a railway special aluminum alloy power cable, which comprises the following steps: 10-15 parts of bisphenol A type epoxy resin are added into 30-35 parts of acetone solvent, then 2-4 parts of diethanolamine is added and stirred to be fully mixed to obtain a resin emulsion. The power cable is coated with a PVA-based coating agent on the surface of the cable rubber body, the PVA-based coating agent is prepared by mixing and matching PVA powder, a chitosan solution, modified hydroxyapatite and silane coupling kaolin agent, the performance of the product is improved through the mixing and matching of the raw materials and the mutual coordination, and the prepared power cable is improved in the coordination between the stain resistance and the oxygen permeability and moisture permeability.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to a railway-specific aluminum alloy power cable and its preparation method. Background Technology

[0002] Power cables are cables used for transmitting and distributing electrical energy. They are commonly used in urban underground power grids, power plant lead-out lines, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas. The proportion of cables in power lines is gradually increasing. Power cables are cable products used in the main lines of power systems to transmit and distribute high-power electrical energy, including power cables of various voltage levels from 1-500KV and above, and various types of insulation.

[0003] In the prior art, the anti-fouling performance of the rubber body used in power cable products is difficult to coordinate with the oxygen and moisture barrier performance, and the product has poor aging stability, which limits the product's efficiency. Based on this, the present invention further improves it. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the purpose of this invention is to provide a railway-specific aluminum alloy power cable and its preparation method, so as to solve the problems mentioned in the background art.

[0005] The technical problem solved by this invention is addressed by the following technical solution: This invention provides a method for preparing a railway-specific aluminum alloy power cable, comprising the following steps:

[0006] Step 1: Add 10-15 parts of bisphenol A epoxy resin to 30-35 parts of acetone solvent, and then add 2-4 parts of diethanolamine and stir to mix thoroughly to obtain resin emulsion;

[0007] Step 2: Preparation of PVA-based coating agent:

[0008] Add 4-7 parts of PVA powder to 6-10 parts of chitosan solution, then add 2-5 parts of modified hydroxyapatite and 5-8 parts of resin emulsion and mix thoroughly. Finally, add 2-4 parts of silane coupling and kaolin agent and continue stirring to obtain a PVA-based coating agent.

[0009] Step 3: Coat the surface of the cable rubber body with a PVA-based coating agent to a thickness of 2mm. After coating, a railway-specific aluminum alloy power cable of the present invention is obtained.

[0010] Preferably, the chitosan solution has a mass fraction of 2-5%.

[0011] Preferably, the method for preparing the modified hydroxyapatite body is as follows:

[0012] S01: Preheat hydroxyapatite at 55-60℃ for 20-30 minutes, then stir the preheated hydroxyapatite and 5% sodium silicate solution at a weight ratio of 2:5 to obtain hydroxyapatite agent.

[0013] S02: Add 2-5 parts sodium dodecylbenzenesulfonate and 1-3 parts carboxymethyl cellulose to 6-10 parts lanthanum chloride solution, then add 2-3 parts nano carbon powder and 1-2 parts zinc nitrate solution, stir thoroughly to obtain the modified solution;

[0014] S03: The hydroxyapatite agent and the modifying liquid are stirred and modified at a weight ratio of 2:5. After stirring, the mixture is filtered and dried to obtain the modified hydroxyapatite body.

[0015] Preferably, the lanthanum chloride solution has a mass fraction of 2-5%; and the zinc nitrate solution has a mass fraction of 3-6%.

[0016] Preferably, the stirring speed for the stirring modification treatment is 350-400 r / min, and the stirring time is 30-40 min.

[0017] Preferably, the preparation method of the silane coupling and kaolin agent is as follows:

[0018] S11: The kaolin is first thermally improved. After the treatment is completed, thermally improved kaolin is obtained.

[0019] S12: Heat-modified kaolin and silane coupling liquid are mixed at a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After ball milling, the mixture is filtered and dried to obtain silane coupling blended kaolin agent.

[0020] Preferably, the specific operation steps of the heat improvement treatment are as follows:

[0021] First, heat the material to 210-220℃ at a rate of 2-5℃ / min and hold for 10 minutes. Then, cool it to 130℃ at a rate of 1-3℃ / min and hold for 5 minutes. Finally, air cool it to room temperature.

[0022] Preferably, the preparation method of the silane coupling solution is as follows:

[0023] Add 2-5 parts of silane coupling agent to 5-8 parts of 5% sodium dodecylbenzenesulfonate solution, then add 1-2 parts of attapulgite and 2-4 parts of yttrium nitrate solution and mix thoroughly to obtain silane coupling solution.

[0024] Preferably, the silane coupling agent is silane coupling agent KH560; the mass fraction of the yttrium nitrate solution is 2-5%.

[0025] The present invention also provides a method for preparing a railway-specific aluminum alloy power cable.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention relates to a power cable that uses a PVA-based coating agent on the surface of the cable's rubber body. The PVA-based coating agent combines PVA powder, chitosan solution, modified hydroxyapatite, and silane coupling agent to harmonize kaolin. Through the harmonious blending and synergistic effect of the raw materials, the product's performance is improved. The prepared power cable exhibits enhanced anti-fouling properties, improved oxygen and moisture barrier properties, and significantly improved aging resistance. The modified hydroxyapatite is prepared by preheating hydroxyapatite at 55-60℃ for 20-30 minutes, followed by mixing the preheated hydroxyapatite with a 5% sodium silicate solution to optimize the hydroxyapatite. The improved stability of the hydroxyapatite body facilitates better synergistic effects with the modified liquid, thereby enhancing the interfacial properties of the raw materials in the system. The hydroxyapatite also serves as a site structure for adsorption onto the surface of the power cable. Simultaneously, the silane coupling agent, made from thermally modified kaolin, optimizes the interlayer spacing and further improves the silane coupling liquid through ball milling. The silane coupling agent, attapulgite, and other raw materials in the silane coupling liquid work synergistically, resulting in a layered kaolin structure that facilitates oxygen and moisture permeability. This, combined with the modified hydroxyapatite body, increases cleaning points, improves the product's antifouling performance, and optimizes its aging stability. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This embodiment describes a method for preparing a railway-specific aluminum alloy power cable, comprising the following steps:

[0030] Step 1: Add 10-15 parts of bisphenol A epoxy resin to 30-35 parts of acetone solvent, and then add 2-4 parts of diethanolamine and stir to mix thoroughly to obtain resin emulsion;

[0031] Step 2: Preparation of PVA-based coating agent:

[0032] Add 4-7 parts of PVA powder to 6-10 parts of chitosan solution, then add 2-5 parts of modified hydroxyapatite and 5-8 parts of resin emulsion and mix thoroughly. Finally, add 2-4 parts of silane coupling and kaolin agent and continue stirring to obtain a PVA-based coating agent.

[0033] Step 3: Coat the surface of the cable rubber body with a PVA-based coating agent to a thickness of 2mm. After coating, a railway-specific aluminum alloy power cable of the present invention is obtained.

[0034] The chitosan solution in this embodiment has a mass fraction of 2-5%.

[0035] The method for preparing the modified hydroxyapatite body in this embodiment is as follows:

[0036] S01: Preheat hydroxyapatite at 55-60℃ for 20-30 minutes, then stir the preheated hydroxyapatite and 5% sodium silicate solution at a weight ratio of 2:5 to obtain hydroxyapatite agent.

[0037] S02: Add 2-5 parts sodium dodecylbenzenesulfonate and 1-3 parts carboxymethyl cellulose to 6-10 parts lanthanum chloride solution, then add 2-3 parts nano carbon powder and 1-2 parts zinc nitrate solution, stir thoroughly to obtain the modified solution;

[0038] S03: The hydroxyapatite agent and the modifying liquid are stirred and modified at a weight ratio of 2:5. After stirring, the mixture is filtered and dried to obtain the modified hydroxyapatite body.

[0039] In this embodiment, the lanthanum chloride solution has a mass fraction of 2-5%; the zinc nitrate solution has a mass fraction of 3-6%.

[0040] In this embodiment, the stirring speed for the stirring modification treatment is 350-400 r / min, and the stirring time is 30-40 min.

[0041] The preparation method of the silane coupling modifier for kaolin in this embodiment is as follows:

[0042] S11: The kaolin is first thermally improved. After the treatment is completed, thermally improved kaolin is obtained.

[0043] S12: Heat-modified kaolin and silane coupling liquid are mixed at a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After ball milling, the mixture is filtered and dried to obtain silane coupling blended kaolin agent.

[0044] The specific operation steps of the heat improvement treatment in this embodiment are as follows:

[0045] First, heat the material to 210-220℃ at a rate of 2-5℃ / min and hold for 10 minutes. Then, cool it to 130℃ at a rate of 1-3℃ / min and hold for 5 minutes. Finally, air cool it to room temperature.

[0046] The preparation method of the silane coupling solution in this embodiment is as follows:

[0047] Add 2-5 parts of silane coupling agent to 5-8 parts of 5% sodium dodecylbenzenesulfonate solution, then add 1-2 parts of attapulgite and 2-4 parts of yttrium nitrate solution and mix thoroughly to obtain silane coupling solution.

[0048] In this embodiment, the silane coupling agent is silane coupling agent KH560; the mass fraction of the yttrium nitrate solution is 2-5%.

[0049] Example 1.

[0050] This embodiment describes a method for preparing a railway-specific aluminum alloy power cable, comprising the following steps:

[0051] Step 1: Add 10 parts of bisphenol A epoxy resin to 30 parts of acetone solvent, and then add 2 parts of diethanolamine and stir to mix thoroughly to obtain resin emulsion;

[0052] Step 2: Preparation of PVA-based coating agent:

[0053] Four parts of PVA powder were added to six parts of chitosan solution, followed by two parts of modified hydroxyapatite and five parts of resin emulsion, and mixed thoroughly. Finally, two parts of silane coupling and kaolin agent were added and stirred thoroughly to obtain a PVA-based coating agent.

[0054] Step 3: Coat the surface of the cable rubber body with a PVA-based coating agent to a thickness of 2mm. After coating, a railway-specific aluminum alloy power cable of the present invention is obtained.

[0055] The chitosan solution in this embodiment has a mass fraction of 2%.

[0056] The method for preparing the modified hydroxyapatite body in this embodiment is as follows:

[0057] S01: Preheat hydroxyapatite at 55°C for 20 minutes, then stir the preheated hydroxyapatite and 5% sodium silicate solution at a weight ratio of 2:5 to obtain hydroxyapatite agent.

[0058] S02: Add 2 parts sodium dodecylbenzenesulfonate and 1 part carboxymethyl cellulose to 6 parts lanthanum chloride solution, then add 2 parts nano carbon powder and 1 part zinc nitrate solution, stir thoroughly to obtain modified solution;

[0059] S03: The hydroxyapatite agent and the modifying liquid are stirred and modified at a weight ratio of 2:5. After stirring, the mixture is filtered and dried to obtain the modified hydroxyapatite body.

[0060] In this embodiment, the lanthanum chloride solution has a mass fraction of 2%; the zinc nitrate solution has a mass fraction of 3%.

[0061] In this embodiment, the stirring speed for the stirring modification treatment is 350 r / min, and the stirring time is 30 min.

[0062] The preparation method of the silane coupling modifier for kaolin in this embodiment is as follows:

[0063] S11: The kaolin is first thermally improved. After the treatment is completed, thermally improved kaolin is obtained.

[0064] S12: Heat-modified kaolin and silane coupling liquid are mixed at a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After ball milling, the mixture is filtered and dried to obtain silane coupling blended kaolin agent.

[0065] The specific operation steps of the heat improvement treatment in this embodiment are as follows:

[0066] First, heat the material to 210℃ at a rate of 2℃ / min and hold for 10 minutes. Then, cool it to 130℃ at a rate of 1℃ / min and hold for 5 minutes. Finally, air cool it to room temperature.

[0067] The preparation method of the silane coupling solution in this embodiment is as follows:

[0068] Two parts of silane coupling agent were added to five parts of a 5% sodium dodecylbenzenesulfonate solution, followed by the addition of one part of attapulgite and two parts of yttrium nitrate solution, and the mixture was thoroughly mixed to obtain a silane coupling solution.

[0069] In this embodiment, the silane coupling agent is silane coupling agent KH560; the mass fraction of the yttrium nitrate solution is 2%.

[0070] Example 2.

[0071] This embodiment describes a method for preparing a railway-specific aluminum alloy power cable, comprising the following steps:

[0072] Step 1: Add 15 parts of bisphenol A epoxy resin to 35 parts of acetone solvent, and then add 4 parts of diethanolamine and stir to mix thoroughly to obtain resin emulsion;

[0073] Step 2: Preparation of PVA-based coating agent:

[0074] Add 7 parts of PVA powder to 10 parts of chitosan solution, then add 5 parts of modified hydroxyapatite and 8 parts of resin emulsion and mix thoroughly. Finally, add 4 parts of silane coupling and kaolin agent and continue stirring to obtain a PVA-based coating agent.

[0075] Step 3: Coat the surface of the cable rubber body with a PVA-based coating agent to a thickness of 2mm. After coating, a railway-specific aluminum alloy power cable of the present invention is obtained.

[0076] The chitosan solution in this embodiment has a mass fraction of 5%.

[0077] The method for preparing the modified hydroxyapatite body in this embodiment is as follows:

[0078] S01: First, preheat hydroxyapatite at 60℃ for 30 minutes, then stir the preheated hydroxyapatite and 5% sodium silicate solution at a weight ratio of 2:5 to obtain hydroxyapatite agent.

[0079] S02: Add 5 parts sodium dodecylbenzenesulfonate and 3 parts carboxymethyl cellulose to 10 parts lanthanum chloride solution, then add 3 parts nano carbon powder and 2 parts zinc nitrate solution, stir thoroughly to obtain modified solution;

[0080] S03: The hydroxyapatite agent and the modifying liquid are stirred and modified at a weight ratio of 2:5. After stirring, the mixture is filtered and dried to obtain the modified hydroxyapatite body.

[0081] In this embodiment, the lanthanum chloride solution has a mass fraction of 5%; the zinc nitrate solution has a mass fraction of 6%.

[0082] In this embodiment, the stirring speed for the stirring modification treatment is 400 r / min, and the stirring time is 40 min.

[0083] The preparation method of the silane coupling modifier for kaolin in this embodiment is as follows:

[0084] S11: The kaolin is first thermally improved. After the treatment is completed, thermally improved kaolin is obtained.

[0085] S12: Heat-modified kaolin and silane coupling liquid are mixed at a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After ball milling, the mixture is filtered and dried to obtain silane coupling blended kaolin agent.

[0086] The specific operation steps of the heat improvement treatment in this embodiment are as follows:

[0087] First, heat the material to 220°C at a rate of 5°C / min and hold for 10 minutes. Then, cool it to 130°C at a rate of 3°C / min and hold for 5 minutes. Finally, air cool it to room temperature.

[0088] The preparation method of the silane coupling solution in this embodiment is as follows:

[0089] Five parts of silane coupling agent were added to eight parts of a 5% sodium dodecylbenzenesulfonate solution, followed by the addition of two parts of attapulgite and four parts of yttrium nitrate solution, and the mixture was thoroughly mixed to obtain a silane coupling solution.

[0090] In this embodiment, the silane coupling agent is silane coupling agent KH560; the mass fraction of the yttrium nitrate solution is 5%.

[0091] Example 3.

[0092] This embodiment describes a method for preparing a railway-specific aluminum alloy power cable, comprising the following steps:

[0093] Step 1: Add 12.5 parts of bisphenol A epoxy resin to 32.5 parts of acetone solvent, and then add 3 parts of diethanolamine and stir to mix thoroughly to obtain a resin emulsion;

[0094] Step 2: Preparation of PVA-based coating agent:

[0095] Add 5.5 parts of PVA powder to 8 parts of chitosan solution, then add 3.5 parts of modified hydroxyapatite and 6.5 parts of resin emulsion and mix thoroughly. Finally, add 3 parts of silane coupling and kaolin agent and continue stirring to obtain a PVA-based coating agent.

[0096] Step 3: Coat the surface of the cable rubber body with a PVA-based coating agent to a thickness of 2mm. After coating, a railway-specific aluminum alloy power cable of the present invention is obtained.

[0097] The chitosan solution in this embodiment has a mass fraction of 3.5%.

[0098] The method for preparing the modified hydroxyapatite body in this embodiment is as follows:

[0099] S01: Preheat hydroxyapatite at 57.5℃ for 25 min, then stir the preheated hydroxyapatite and 5% sodium silicate solution at a weight ratio of 2:5 to obtain hydroxyapatite agent.

[0100] S02: Add 3.5 parts sodium dodecylbenzenesulfonate and 2 parts carboxymethyl cellulose to 8 parts lanthanum chloride solution, then add 2.5 parts nano carbon powder and 1.5 parts zinc nitrate solution, stir thoroughly to obtain the modified solution;

[0101] S03: The hydroxyapatite agent and the modifying liquid are stirred and modified at a weight ratio of 2:5. After stirring, the mixture is filtered and dried to obtain the modified hydroxyapatite body.

[0102] In this embodiment, the lanthanum chloride solution has a mass fraction of 3.5%; the zinc nitrate solution has a mass fraction of 4.5%.

[0103] In this embodiment, the stirring speed for the stirring modification treatment is 370 r / min, and the stirring time is 35 min.

[0104] The preparation method of the silane coupling modifier for kaolin in this embodiment is as follows:

[0105] S11: The kaolin is first thermally improved. After the treatment is completed, thermally improved kaolin is obtained.

[0106] S12: Heat-modified kaolin and silane coupling liquid are mixed at a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After ball milling, the mixture is filtered and dried to obtain silane coupling blended kaolin agent.

[0107] The specific operation steps of the heat improvement treatment in this embodiment are as follows:

[0108] First, heat the material to 215℃ at a rate of 3.5℃ / min and hold for 10 minutes. Then, cool it to 130℃ at a rate of 2℃ / min and hold for 5 minutes. Finally, air cool it to room temperature.

[0109] The preparation method of the silane coupling solution in this embodiment is as follows:

[0110] Add 3.5 parts of silane coupling agent to 6.5 parts of 5% sodium dodecylbenzenesulfonate solution, then add 1.5 parts of attapulgite and 3 parts of yttrium nitrate solution and mix thoroughly to obtain silane coupling solution.

[0111] In this embodiment, the silane coupling agent is silane coupling agent KH560; the mass fraction of the yttrium nitrate solution is 2-5%.

[0112] Example 4.

[0113] This embodiment describes a method for preparing a railway-specific aluminum alloy power cable, comprising the following steps:

[0114] Step 1: Add 12 parts of bisphenol A epoxy resin to 32 parts of acetone solvent, and then add 3 parts of diethanolamine and stir to mix thoroughly to obtain resin emulsion;

[0115] Step 2: Preparation of PVA-based coating agent:

[0116] Add 5 parts of PVA powder to 7 parts of chitosan solution, then add 3 parts of modified hydroxyapatite and 6 parts of resin emulsion and mix thoroughly. Finally, add 3 parts of silane coupling and kaolin agent and continue stirring to obtain a PVA-based coating agent.

[0117] Step 3: Coat the surface of the cable rubber body with a PVA-based coating agent to a thickness of 2mm. After coating, a railway-specific aluminum alloy power cable of the present invention is obtained.

[0118] The chitosan solution in this embodiment has a mass fraction of 3%.

[0119] The method for preparing the modified hydroxyapatite body in this embodiment is as follows:

[0120] S01: Preheat hydroxyapatite at 56℃ for 22 min, then stir the preheated hydroxyapatite and 5% sodium silicate solution at a weight ratio of 2:5 to obtain hydroxyapatite agent.

[0121] S02: Add 3 parts sodium dodecylbenzenesulfonate and 2 parts carboxymethyl cellulose to 7 parts lanthanum chloride solution, then add 2 parts nano carbon powder and 1 part zinc nitrate solution, stir thoroughly to obtain modified solution;

[0122] S03: The hydroxyapatite agent and the modifying liquid are stirred and modified at a weight ratio of 2:5. After stirring, the mixture is filtered and dried to obtain the modified hydroxyapatite body.

[0123] In this embodiment, the lanthanum chloride solution has a mass fraction of 3%; the zinc nitrate solution has a mass fraction of 3-6%.

[0124] In this embodiment, the stirring speed for the stirring modification treatment is 360 r / min, and the stirring time is 32 min.

[0125] The preparation method of the silane coupling modifier for kaolin in this embodiment is as follows:

[0126] S11: The kaolin is first thermally improved. After the treatment is completed, thermally improved kaolin is obtained.

[0127] S12: Heat-modified kaolin and silane coupling liquid are mixed at a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After ball milling, the mixture is filtered and dried to obtain silane coupling blended kaolin agent.

[0128] The specific operation steps of the heat improvement treatment in this embodiment are as follows:

[0129] First, heat the material to 212°C at a rate of 3°C / min and hold for 10 minutes. Then, cool it to 130°C at a rate of 2°C / min and hold for 5 minutes. Finally, air cool it to room temperature.

[0130] The preparation method of the silane coupling solution in this embodiment is as follows:

[0131] Add 3 parts of silane coupling agent to 6 parts of 5% sodium dodecylbenzenesulfonate solution, then add 1 part of attapulgite and 3 parts of yttrium nitrate solution and mix thoroughly to obtain silane coupling solution.

[0132] In this embodiment, the silane coupling agent is silane coupling agent KH560; the mass fraction of the yttrium nitrate solution is 3%.

[0133] Comparative Example 1.

[0134] Unlike Example 3, no modified hydroxyapatite was added.

[0135] Comparative Example 2.

[0136] Unlike Example 3, no modification solution was added to the modified hydroxyapatite body.

[0137] Comparative Example 3.

[0138] Unlike Example 3, no nano-carbon powder or zinc nitrate solution was added to the modified solution.

[0139] Comparative Example 4.

[0140] Unlike Example 3, no silane coupling agent was added to adjust the kaolin.

[0141] Comparative Example 5.

[0142] Unlike Example 3, no silane coupling liquid was added in the preparation of the silane coupling agent for harmonizing kaolin.

[0143] Comparative Example 6.

[0144] Unlike Example 3, no attapulgite and yttrium nitrate solution were added to the silane coupling solution.

[0145] The performance of the products in Examples 1-4 and Comparative Examples 1-6 of this invention was tested under normal conditions, and the products were irradiated with ultraviolet light at an intensity of 50 mw / m2 for 1 hour to test their UV aging stability. The test results are as follows.

[0146]

[0147] As can be seen from Examples 1-4 and Comparative Examples 1-6, the products of Examples 1-4 of the present invention have excellent water vapor barrier transmittance and anti-fouling performance, and the products also have excellent performance under ultraviolet conditions.

[0148] The product's performance deteriorates significantly without the addition of either modified hydroxyapatite or silane coupling agent to regulate kaolin. By combining the two, the product's performance is significantly improved.

[0149] In the preparation of modified hydroxyapatite without the addition of modifying liquid, modified liquid without the addition of nano-carbon powder and zinc nitrate solution, silane coupling agent without the addition of silane coupling liquid, and silane coupling agent without the addition of attapulgite and yttrium nitrate solution, the performance of the product tends to deteriorate. Only the modified hydroxyapatite and silane coupling agent obtained by the method of this invention have the most significant performance effect. Other methods are not as effective as the method of this invention.

[0150] 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 implemented 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 exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0151] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing a railway-specific aluminum alloy power cable, characterized in that, Includes the following steps: Step 1: Add 10-15 parts of bisphenol A epoxy resin to 30-35 parts of acetone solvent, and then add 2-4 parts of diethanolamine and stir to mix thoroughly to obtain resin emulsion; Step 2: Preparation of PVA-based coating agent: Add 4-7 parts of PVA powder to 6-10 parts of chitosan solution, then add 2-5 parts of modified hydroxyapatite and 5-8 parts of resin emulsion and mix thoroughly. Finally, add 2-4 parts of silane coupling and kaolin agent and continue stirring to obtain a PVA-based coating agent. Step 3: Coat the surface of the cable rubber body with a PVA-based coating agent to a thickness of 2mm. The coating is then complete, resulting in a railway-specific aluminum alloy power cable. The method for preparing the modified hydroxyapatite body is as follows: S01: Preheat hydroxyapatite at 55-60℃ for 20-30 minutes, then stir the preheated hydroxyapatite and 5% sodium silicate solution at a weight ratio of 2:5 to obtain hydroxyapatite agent. S02: Add 2-5 parts sodium dodecylbenzenesulfonate and 1-3 parts carboxymethyl cellulose to 6-10 parts lanthanum chloride solution, then add 2-3 parts nano carbon powder and 1-2 parts zinc nitrate solution, stir thoroughly to obtain the modified solution; S03: Hydroxyapatite agent and modifying liquid are mixed and modified at a weight ratio of 2:

5. After mixing, the mixture is filtered and dried to obtain modified hydroxyapatite body. The preparation method of the silane coupling kaolin agent is as follows: S11: The kaolin is first thermally improved. After the treatment is completed, thermally improved kaolin is obtained. S12: Heat-modified kaolin and silane coupling liquid are mixed at a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 h. After ball milling, the mixture is filtered and dried to obtain silane coupling kaolin agent. The preparation method of the silane coupling solution is as follows: Add 2-5 parts of silane coupling agent to 5-8 parts of 5% sodium dodecylbenzenesulfonate solution, then add 1-2 parts of attapulgite and 2-4 parts of yttrium nitrate solution and mix thoroughly to obtain silane coupling solution; The specific steps of the heat improvement treatment are as follows: First, heat the material to 210-220℃ at a rate of 2-5℃ / min and hold for 10 minutes. Then, cool it to 130℃ at a rate of 1-3℃ / min and hold for 5 minutes. Finally, air cool it to room temperature.

2. The method for preparing a railway-specific aluminum alloy power cable according to claim 1, characterized in that, The chitosan solution has a mass fraction of 2-5%.

3. The method for preparing a railway-specific aluminum alloy power cable according to claim 1, characterized in that, The lanthanum chloride solution has a mass fraction of 2-5%; the zinc nitrate solution has a mass fraction of 3-6%.

4. The method for preparing a railway-specific aluminum alloy power cable according to claim 1, characterized in that, The stirring speed for the stirring modification treatment is 350-400 r / min, and the stirring time is 30-40 min.

5. The method for preparing a railway-specific aluminum alloy power cable according to claim 1, characterized in that, The silane coupling agent is silane coupling agent KH560; the mass fraction of the yttrium nitrate solution is 2-5%.

6. The power cable prepared by the method for preparing a railway-specific aluminum alloy power cable as described in any one of claims 1-5.

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