Salt spray corrosion resistant cable and preparation method thereof
By using a combination of quaternary ammonium salt modified adamantane and disulfide-based polyester in the outer sheath of the cable, a protective barrier and self-healing mechanism are formed, solving the corrosion problem of the cable in a high salt spray environment. This achieves excellent resistance to salt spray corrosion, tensile strength, and self-healing effects, extending the service life of the cable.
Patent Information
- Application Number
- CN202511836235.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-08
- Publication Date
- 2026-02-17
AI Technical Summary
Existing cables are prone to corrosion in high salt spray environments, leading to material aging and cracking, which affects conductivity and service life. Furthermore, existing protective measures are limited in effectiveness or increase cable weight, making construction inconvenient.
An outer sheath layer containing quaternary ammonium salt modified adamantane and disulfide polyester is used. Through charge adsorption and dynamic self-healing mechanisms, combined with antioxidants and lubricants, a dense molecular network is formed to enhance the resistance to salt spray corrosion.
It maintains good mechanical properties and self-healing ability in high salt spray environments, extends cable life, avoids salt ion corrosion, and improves conductivity and ease of construction.
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Figure CN121537696A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cable technology, specifically to a salt spray corrosion resistant cable and its preparation method. Background Technology
[0002] In marine engineering, coastal power transmission, and salt field operations, the concentration of salt spray in the environment is extremely high. The chloride ions in the salt spray are highly corrosive, severely eroding the insulation, sheath, and conductor of cables. This ultimately leads to aging and cracking of the cable materials in the salt spray environment, allowing moisture and chloride ions to penetrate, reducing the cable's conductivity, shortening its service life, and even causing safety accidents. Current cable solutions often use the addition of a single antioxidant or corrosion resistant agent to the material, but the effect is limited and it is difficult to withstand the continuous erosion of high-concentration salt spray for a long time. Some methods enhance protection by increasing the sheath thickness, but this increases the cable weight and makes construction and laying more difficult. Therefore, developing a cable with excellent long-term resistance to salt spray corrosion while also maintaining good mechanical properties has become an urgent problem to be solved in the current cable technology field. Summary of the Invention
[0003] Technical problems to be solved
[0004] To address the shortcomings of existing technologies, this invention provides a salt spray corrosion resistant cable and its preparation method, which exhibits good resistance to salt spray corrosion, tensile strength, and self-healing properties.
[0005] Technical solution
[0006] To achieve the above objectives, the present invention provides the following technical solution: a salt spray corrosion resistant cable, the salt spray corrosion resistant cable comprising: a cable conductor, an insulating material, and an outer sheath layer;
[0007] The cable conductor has a copper core.
[0008] The insulating material comprises the following components by weight: 100-120 parts by weight of low-density polyethylene, 2-3 parts by weight of bisphenol A bis(diphenyl phosphate), 0.2-0.4 parts by weight of antioxidant 1010, and 0.1-0.3 parts by weight of tea polyphenols.
[0009] The outer sheath layer comprises the following weight components: 90-110 parts by weight of low-density polyethylene, 2-3 parts by weight of maleic anhydride-grafted polyethylene, 3-4 parts by weight of quaternary ammonium salt modified adamantane, 5-8 parts by weight of disulfide polyester, 1-1.4 parts by weight of carbon black, 0.5-0.8 parts by weight of calcium stearate, and 0.3-0.35 parts by weight of antioxidant 1010;
[0010] The outer sheath layer is prepared by mixing low-density polyethylene, maleic anhydride-grafted polyethylene, quaternary ammonium salt modified adamantane, disulfide polyester, carbon black, calcium stearate, and antioxidant 1010 at 165-170℃ for 4-6 minutes to obtain the outer sheath layer.
[0011] Furthermore, the preparation method of the quaternary ammonium salt modified adamantane is as follows:
[0012] S1. Add 1-adamantane carboxylic acid and 4-dimethylaminopyridine to the reaction flask, stir and mix, slowly add thionyl chloride dropwise, after the addition is complete, react at 35-37℃ for 2-3 h, and distill under reduced pressure to obtain acyl adamantane.
[0013] S2. Add acyl chloride adamantane to tetrahydrofuran solvent, add N,N'-dimethylethylenediamine under stirring, react at 1-3℃ for 0.5-1h, filter after reaction, and recrystallize with tetrahydrofuran and water in sequence to obtain tertiary amine-modified adamantane.
[0014] S3. Add tetrahydrofuran and LiAlH4 to the reaction flask, and add tertiary amine-modified adamantane while stirring. React at 65-70℃ for 4-5 hours. After the reaction is completed, cool the reaction solution to room temperature, and add 1-1.2g of water, 2-2.4g of 15% sodium hydroxide solution, and 4-6g of anhydrous sodium sulfate in sequence. Stir for 1-2 hours. After the reaction is completed, filter and rotary evaporate to obtain intermediate 1.
[0015] S4. Add intermediate 1 and 6-chloro-1-hexanol to N,N-dimethylformamide solvent, stir and mix, react at 65-70℃ for 3-4 h, after which distill under reduced pressure, wash and dry to obtain quaternary ammonium salt modified adamantane.
[0016] Further, in S1, the ratio of 1-adamantanecarboxylic acid, 4-dimethylaminopyridine, and thionyl chloride is 2.1-2.5g: 0.06-0.08g: 2.0-2.13g.
[0017] Furthermore, in S2, the ratio of acyl chloride alkylene, tetrahydrofuran solvent, and N,N'-dimethylethylenediamine is 1.8-2g: 15-18mL: 0.9-1g.
[0018] Furthermore, in S3, the ratio of tetrahydrofuran, LiAlH4, and tertiary amine-modified adamantane is 30-40 mL: 0.6-0.7 g: 8-10 mmol.
[0019] Furthermore, in S4, the ratio of N,N-dimethylformamide, intermediate 1,6-chloro-1-hexanol is 50-55 mL: 7-8.5 mmol: 0.96-1.17 g.
[0020] Further, the preparation method of the disulfide-based polyester is as follows: 5-10 mmol of dithiol dihydroxyacetic acid, 10-20 mmol of pentaerythritol and 0.01-0.02 g of p-toluenesulfonic acid are added to a reaction flask, stirred and mixed, and then 2-3 mL of cyclohexane dehydrating agent is added. The reaction is carried out at 170-180℃ for 2-4 h. After the reaction is completed, the mixture is distilled under reduced pressure and washed with anhydrous ethanol to obtain the disulfide-based polyester.
[0021] Furthermore, the method for preparing the salt spray corrosion resistant cable is as follows:
[0022] Step 1: The copper core is stretched multiple times using a wire drawing machine to achieve the required conductor diameter. Then, the conductors are twisted together to form a copper wire core.
[0023] Step 2: Extrude the insulating material around the copper wire core. After cross-linking, the insulating material forms an insulating layer. Then, continue to wrap the outer sheath layer around the insulating layer to finally obtain a salt spray corrosion resistant cable.
[0024] Beneficial technical effects
[0025] The quaternary ammonium salt-modified adamantane in the outer sheath of this invention contains quaternary ammonium salt groups, which precisely capture chloride ions in salt spray through charge adsorption, forming a protective barrier to prevent chloride ions from corroding the conductor, insulation layer, and internal structure of the sheath. After 3000 hours of salt spray testing (35°C, 6% salt spray concentration), the tensile strength retention rate is still above 80% (29.5 MPa / 32.6 MPa in Example 3), which is far superior to the comparative example lacking this component (Comparative Example 1 only 23.2 MPa). The dynamic disulfide bonds in the disulfide-based polyester in the outer sheath can autonomously repair micro-cracks in the sheath under salt spray conditions, preventing moisture and chloride ions from penetrating into the interior through cracks, indirectly enhancing the corrosion resistance. Compared with the comparative example without this component (Comparative Example 3), the elongation at break after salt spray resistance is still better.
[0026] Synergistic enhancement of protective durability by components: Tea polyphenols in the insulation material and antioxidant 1010 form an antioxidant synergistic system to inhibit the oxidative aging of materials under salt spray environment; carbon black in the outer sheath layer works in conjunction with antioxidant 1010 to further reduce the synergistic corrosion of ultraviolet rays and salt spray, and extend the service life of the cable in marine engineering, coastal transmission and other scenarios.
[0027] During the mixing process, the terminal hydroxyl groups of disulfide-based polyester and quaternary ammonium salt-modified adamantane react chemically with the anhydride groups of maleic anhydride-grafted polyethylene, forming a dense molecular network with low-density polyethylene. This improves the tensile strength and elongation at break of the cable outer sheath. Simultaneously, the adamantyl groups in the quaternary ammonium salt-modified adamantane possess a rigid three-dimensional structure, uniformly dispersed in the sheath layer to form "rigid support points," resulting in good mechanical properties. Calcium stearate acts as a lubricant, optimizing the flowability of the outer sheath during mixing and preventing component decomposition during high-temperature processing. Maleic anhydride-grafted polyethylene enhances the compatibility of the components, ensuring that the cable is less prone to sheath cracking during bending and laying, balancing ease of construction and reliability. Attached Figure Description
[0028] Figure 1 This is the synthesis circuit diagram of intermediate 1 in Example 1.
[0029] Figure 2 Synthetic route diagram of quaternary ammonium salt modified adamantane. Detailed Implementation
[0030] 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. Obviously, the described embodiments are only some embodiments of the present invention, 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.
[0031] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific embodiments.
[0032] The polyethylene in this application is low-density polyethylene.
[0033] In this application, the copper wire core diameter is 1.2 mm, the insulation material thickness is 3 mm, and the outer sheath thickness is 6 mm.
[0034] Example 1
[0035] A salt spray corrosion resistant cable, the salt spray corrosion resistant cable comprising: a cable conductor, an insulating material, and an outer sheath layer;
[0036] The cable conductor has a copper core.
[0037] The insulating material comprises the following components by weight: 100 parts by weight of low-density polyethylene, 2 parts by weight of bisphenol A bis(diphenyl phosphate), 0.2 parts by weight of antioxidant 1010, and 0.1 parts by weight of tea polyphenols.
[0038] The outer sheath layer comprises the following weight components: 90 parts by weight of low-density polyethylene, 2 parts by weight of maleic anhydride-grafted polyethylene, 3 parts by weight of quaternary ammonium salt modified adamantane, 5 parts by weight of disulfide polyester, 1 part by weight of carbon black, 0.5 parts by weight of calcium stearate, and 0.3 parts by weight of antioxidant 1010.
[0039] The outer sheath layer is prepared by mixing low-density polyethylene, maleic anhydride-grafted polyethylene, quaternary ammonium salt modified adamantane, disulfide polyester, carbon black, calcium stearate, and antioxidant 1010 at 165°C for 4 minutes to obtain the outer sheath layer.
[0040] The preparation method of the quaternary ammonium salt modified adamantane is as follows:
[0041] S1. Add 2.1 g of 1-adamantane carboxylic acid and 0.06 g of 4-dimethylaminopyridine to the reaction flask, stir and mix, slowly add 2.0 g of thionyl chloride dropwise, after the addition is complete, react at 35 °C for 2 h, and distill under reduced pressure to obtain acyl adamantane.
[0042] S2. Add 1.8 g of acyl chloride adamantane to 15 mL of tetrahydrofuran solvent, add 0.9 g of N,N'-dimethylethylenediamine while stirring, react at 1 °C for 0.5 h, filter after the reaction, and recrystallize successively with tetrahydrofuran and water to obtain tertiary amine-modified adamantane.
[0043] S3. Add 30 mL of tetrahydrofuran and 0.6 g of LiAlH4 to the reaction flask, and add 8 mmol of tertiary amine-modified adamantane while stirring. React at 65 °C for 4 h. After the reaction is completed, cool the reaction solution to room temperature, and add 1 g of water, 2 g of 15% sodium hydroxide solution and 4 g of anhydrous sodium sulfate in sequence. Stir for 1 h, filter under vacuum and evaporate by rotary evaporation to obtain intermediate 1.
[0044] S4. Add 7 mmol of intermediate 1 and 0.96 g of 6-chloro-1-hexanol to 50 mL of N,N-dimethylformamide solvent, stir and mix, react at 65 °C for 3 h, and after the reaction is completed, distill under reduced pressure, wash and dry to obtain quaternary ammonium salt modified adamantane.
[0045] The preparation method of the disulfide-based polyester is as follows: 5 mmol of dithiol dihydroxyacetic acid, 10 mmol of pentaerythritol and 0.01 g of p-toluenesulfonic acid are added to a reaction flask, stirred and mixed, and then 2 mL of cyclohexane dehydrating agent is added. The reaction is carried out at 170 °C for 2 h. After the reaction is completed, the mixture is distilled under reduced pressure and washed with anhydrous ethanol to obtain the disulfide-based polyester.
[0046] The method for preparing the salt spray corrosion resistant cable is as follows:
[0047] Step 1: The copper core is stretched multiple times using a wire drawing machine to achieve the required conductor diameter. Then, the conductors are twisted together to form a copper wire core.
[0048] Step 2: Extrude the insulating material around the copper wire core. After cross-linking, the insulating material forms an insulating layer. Then, continue to wrap the outer sheath layer around the insulating layer to finally obtain a salt spray corrosion resistant cable.
[0049] Example 2
[0050] A salt spray corrosion resistant cable, the salt spray corrosion resistant cable comprising: a cable conductor, an insulating material, and an outer sheath layer;
[0051] The cable conductor has a copper core.
[0052] The insulating material comprises the following components by weight: 120 parts by weight of low-density polyethylene, 3 parts by weight of bisphenol A bis(diphenyl phosphate), 0.4 parts by weight of antioxidant 1010, and 0.3 parts by weight of tea polyphenols.
[0053] The outer sheath layer comprises the following weight components: 110 parts by weight of low-density polyethylene, 3 parts by weight of maleic anhydride-grafted polyethylene, 4 parts by weight of quaternary ammonium salt modified adamantane, 8 parts by weight of disulfide polyester, 1.4 parts by weight of carbon black, 0.8 parts by weight of calcium stearate, and 0.35 parts by weight of antioxidant 1010.
[0054] The outer sheath layer is prepared by mixing low-density polyethylene, maleic anhydride-grafted polyethylene, quaternary ammonium salt modified adamantane, disulfide polyester, carbon black, calcium stearate, and antioxidant 1010 at 170°C for 6 minutes to obtain the outer sheath layer.
[0055] The preparation method of the quaternary ammonium salt modified adamantane is as follows:
[0056] S1. Add 2.5 g of 1-adamantane carboxylic acid and 0.08 g of 4-dimethylaminopyridine to the reaction flask, stir and mix, slowly add 2.13 g of thionyl chloride dropwise, after the addition is complete, react at 37 °C for 3 h, and distill under reduced pressure to obtain acyl chloride adamantane;
[0057] S2. Add 2g of acyl chloride adamantane to 18mL of tetrahydrofuran solvent, add 1g of N,N'-dimethylethylenediamine while stirring, react at 3℃ for 1h, filter after the reaction, and recrystallize with tetrahydrofuran and water in sequence to obtain tertiary amino-modified adamantane.
[0058] S3. Add 40 mL of tetrahydrofuran and 0.7 g of LiAlH4 to the reaction flask, and add 10 mmol of tertiary amine-modified adamantane while stirring. React at 70 °C for 5 h. After the reaction is completed, cool the reaction solution to room temperature, and add 1.2 g of water, 2.4 g of 15% sodium hydroxide solution and 6 g of anhydrous sodium sulfate in sequence. Stir for 2 h, filter under vacuum and evaporate by rotary evaporation to obtain intermediate 1.
[0059] S4. Add 8.5 mmol of intermediate 1 and 1.17 g of 6-chloro-1-hexanol to 55 mL of N,N-dimethylformamide solvent, stir and mix, react at 70 °C for 4 h, and after the reaction is completed, distill under reduced pressure, wash and dry to obtain quaternary ammonium salt modified adamantane.
[0060] The preparation method of the disulfide-based polyester is as follows: 10 mmol of dithiol dihydroxyacetic acid, 20 mmol of pentaerythritol and 0.02 g of p-toluenesulfonic acid are added to a reaction flask, stirred and mixed, and then 3 mL of cyclohexane dehydrating agent is added. The reaction is carried out at 180 °C for 4 h. After the reaction is completed, the mixture is distilled under reduced pressure and washed with anhydrous ethanol to obtain the disulfide-based polyester.
[0061] The method for preparing the salt spray corrosion resistant cable is as follows:
[0062] Step 1: The copper core is stretched multiple times using a wire drawing machine to achieve the required conductor diameter. Then, the conductors are twisted together to form a copper wire core.
[0063] Step 2: Extrude the insulating material around the copper wire core. After cross-linking, the insulating material forms an insulating layer. Then, continue to wrap the outer sheath layer around the insulating layer to finally obtain a salt spray corrosion resistant cable.
[0064] Example 3
[0065] A salt spray corrosion resistant cable, the salt spray corrosion resistant cable comprising: a cable conductor, an insulating material, and an outer sheath layer;
[0066] The cable conductor has a copper core.
[0067] The insulating material comprises the following components by weight: 110 parts by weight of low-density polyethylene, 2.5 parts by weight of bisphenol A bis(diphenyl phosphate), 0.3 parts by weight of antioxidant 1010, and 0.2 parts by weight of tea polyphenols.
[0068] The outer sheath layer comprises the following weight components: 100 parts by weight of low-density polyethylene, 2.5 parts by weight of maleic anhydride-grafted polyethylene, 3 parts by weight of quaternary ammonium salt modified adamantane, 6 parts by weight of disulfide polyester, 1.2 parts by weight of carbon black, 0.6 parts by weight of calcium stearate, and 0.32 parts by weight of antioxidant 1010.
[0069] The outer sheath layer is prepared by mixing low-density polyethylene, maleic anhydride-grafted polyethylene, quaternary ammonium salt modified adamantane, disulfide polyester, carbon black, calcium stearate, and antioxidant 1010 at 167°C for 5 minutes to obtain the outer sheath layer.
[0070] The preparation method of the quaternary ammonium salt modified adamantane is as follows:
[0071] S1. Add 2.3g of 1-adamantane carboxylic acid and 0.07g of 4-dimethylaminopyridine to the reaction flask, stir and mix, slowly add 2.06g of thionyl chloride dropwise, after the addition is complete, react at 36℃ for 3h, and distill under reduced pressure to obtain acyl chloride adamantane;
[0072] S2. Add 1.9 g of acyl chloride adamantane to 17 mL of tetrahydrofuran solvent, add 0.9 g of N,N'-dimethylethylenediamine while stirring, react at 2 °C for 0.6 h, filter after the reaction, and recrystallize successively with tetrahydrofuran and water to obtain tertiary amine-modified adamantane.
[0073] S3. Add 36 mL of tetrahydrofuran and 0.65 g of LiAlH4 to the reaction flask, and add 9 mmol of tertiary amine-modified adamantane while stirring. React at 68 °C for 4 h. After the reaction is completed, cool the reaction solution to room temperature, and add 1.1 g of water, 2.2 g of 15% sodium hydroxide solution and 5 g of anhydrous sodium sulfate in sequence. Stir for 1 h, filter under vacuum and evaporate by rotary evaporation to obtain intermediate 1.
[0074] S4. Add 8 mmol of intermediate 1 and 1.12 g of 6-chloro-1-hexanol to 53 mL of N,N-dimethylformamide solvent, stir and mix, react at 68 °C for 3.5 h, distill under reduced pressure after reaction, wash and dry to obtain quaternary ammonium salt modified adamantane.
[0075] The preparation method of the disulfide-based polyester is as follows: 7 mmol of dithiol dihydroxyacetic acid, 15 mmol of pentaerythritol and 0.015 g of p-toluenesulfonic acid are added to a reaction flask, stirred and mixed, and then 2.4 mL of cyclohexane dehydrating agent is added. The reaction is carried out at 175 °C for 3 h. After the reaction is completed, the mixture is distilled under reduced pressure and washed with anhydrous ethanol to obtain the disulfide-based polyester.
[0076] The method for preparing the salt spray corrosion resistant cable is as follows:
[0077] Step 1: The copper core is stretched multiple times using a wire drawing machine to achieve the required conductor diameter. Then, the conductors are twisted together to form a copper wire core.
[0078] Step 2: Extrude the insulating material around the copper wire core. After cross-linking, the insulating material forms an insulating layer. Then, continue to wrap the outer sheath layer around the insulating layer to finally obtain a salt spray corrosion resistant cable.
[0079] Comparative Example 1
[0080] The difference between this comparative example and Example 3 is that intermediate 1 is used instead of quaternary ammonium salt modified adamantane.
[0081] Comparative Example 2
[0082] The difference between this comparative example and Example 3 is that pentaerythritol is used instead of dithioester polyester.
[0083] Comparative Example 3
[0084] The difference between this comparative example and Example 3 is that disulfide polyester was not added.
[0085] The tensile strength and elongation at break of the outer sheath were determined in accordance with GB / T1040.1-2018.
[0086] Salt spray resistance test was conducted in accordance with GB / T2423.17-2008 standard. Test conditions: 35℃×3000h, salt spray concentration (6%).
[0087] Samples were made from the cables of the examples and comparative examples, measuring 5cm in length, 5cm in width, and 2mm in thickness. A 1mm scratch was made on the surface of each sample, and then the sample was heated to 60°C. The time it took for the scratch to disappear was recorded to evaluate the self-healing performance.
[0088] Table 1: Performance Tests
[0089] project Tensile strength (MPa) Elongation at break (%) Salt spray tensile strength (MPa) Salt spray resistance elongation at break (%) Self-repair time (s) Example 1 33.2 438.9 28.1 412.4 30 Example 2 35.7 453.8 30.4 420.9 28 Example 3 32.6 447.1 29.5 402.7 29 Comparative Example 1 28.4 390.4 23.2 340.1 33 Comparative Example 2 25.5 372.6 18.7 312.4 35 Comparative Example 3 21.3 350.3 15.4 281.7 38
[0090] As shown in Table 1, the cable of the present invention has good salt spray resistance, tensile strength and self-healing effect.
[0091] Comparative Example 1: Intermediate 1, without the quaternary ammonium salt modification of step S4, contains only tertiary amine groups and no hydroxyl groups. It cannot undergo crosslinking with maleic anhydride-grafted polyethylene, resulting in a lower molecular network density and lower initial tensile strength compared to Example 3. Comparative Example 2: Although pentaerythritol contains four hydroxyl groups, it lacks dynamic disulfide bonds (-SS-) and has a simple molecular structure (only a polyol). The resulting crosslinking network density is low, leading to lower tensile strength than Example 3. Comparative Example 3: Lacking the hydroxyl crosslinking sites of the disulfide-based polyester, the outer sheath layer relies solely on the physical blending of maleic anhydride-grafted polyethylene and low-density polyethylene. Weak intermolecular forces result in decreased tensile strength. Comparative Example 1 (without quaternary ammonium salt modification): Intermediate 1 lacks quaternary ammonium salt groups and cannot adsorb Cl⁻. Cl⁻ can directly penetrate into the outer sheath layer, causing molecular chain breakage. The tensile strength after salt spray resistance is lower than that of Example 3. Comparative Examples 2-3: The lack of crack repair function of disulfide-based polyester led to the continuous expansion of microcracks caused by salt spray, and the large-scale penetration of moisture and Cl⁻ accelerated material aging, resulting in performance degradation.
[0092] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0093] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
[0094] Those skilled in the art should understand that the above descriptions are merely several specific embodiments of the present invention, and not all embodiments.
Claims
1. A salt spray corrosion resistant cable, characterized in that, The salt spray corrosion resistant cable includes: a cable conductor, an insulating material, and an outer sheath layer; The cable conductor has a copper core. The insulating material comprises the following components by weight: 100-120 parts by weight of low-density polyethylene, 2-3 parts by weight of bisphenol A bis(diphenyl phosphate), 0.2-0.4 parts by weight of antioxidant 1010, and 0.1-0.3 parts by weight of tea polyphenols. The outer sheath layer comprises the following weight components: 90-110 parts by weight of low-density polyethylene, 2-3 parts by weight of maleic anhydride-grafted polyethylene, 3-4 parts by weight of quaternary ammonium salt modified adamantane, 5-8 parts by weight of disulfide polyester, 1-1.4 parts by weight of carbon black, 0.5-0.8 parts by weight of calcium stearate, and 0.3-0.35 parts by weight of antioxidant 1010; The outer sheath layer is prepared by mixing low-density polyethylene, maleic anhydride-grafted polyethylene, quaternary ammonium salt modified adamantane, disulfide polyester, carbon black, calcium stearate, and antioxidant 1010 at 165-170℃ for 4-6 minutes to obtain the outer sheath layer.
2. The salt spray corrosion resistant cable according to claim 1, characterized in that, The preparation method of the quaternary ammonium salt modified adamantane is as follows: S1. Add 1-adamantane carboxylic acid and 4-dimethylaminopyridine to the reaction flask, stir and mix, slowly add thionyl chloride dropwise, after the addition is complete, react at 35-37℃ for 2-3 h, and distill under reduced pressure to obtain acyl adamantane. S2. Add acyl chloride adamantane to tetrahydrofuran solvent, add N,N'-dimethylethylenediamine under stirring, react at 1-3℃ for 0.5-1h, filter after reaction, and recrystallize with tetrahydrofuran and water in sequence to obtain tertiary amine-modified adamantane. S3. Add tetrahydrofuran and LiAlH4 to the reaction flask, and add tertiary amine-modified adamantane while stirring. React at 65-70℃ for 4-5 hours. After the reaction is completed, cool the reaction solution to room temperature, and add 1-1.2g of water, 2-2.4g of 15% sodium hydroxide solution, and 4-6g of anhydrous sodium sulfate in sequence. Stir for 1-2 hours. After the reaction is completed, filter and rotary evaporate to obtain intermediate 1. S4. Add intermediate 1 and 6-chloro-1-hexanol to N,N-dimethylformamide solvent, stir and mix, react at 65-70℃ for 3-4 h, after which distill under reduced pressure, wash and dry to obtain quaternary ammonium salt modified adamantane.
3. The salt spray corrosion resistant cable according to claim 2, characterized in that, In S1, the ratio of 1-adamantanecarboxylic acid, 4-dimethylaminopyridine, and thionyl chloride is 2.1-2.5g: 0.06-0.08g: 2.0-2.13g.
4. The salt spray corrosion resistant cable according to claim 2, characterized in that, In S2, the ratio of acyl chloride alkylene, tetrahydrofuran solvent, and N,N'-dimethylethylenediamine is 1.8-2g: 15-18mL: 0.9-1g.
5. The salt spray corrosion resistant cable according to claim 2, characterized in that, In S3, the ratio of tetrahydrofuran, LiAlH4, and tertiary amine-modified adamantane is 30-40 mL: 0.6-0.7 g: 8-10 mmol.
6. The salt spray corrosion resistant cable according to claim 2, characterized in that, In S4, the ratio of N,N-dimethylformamide, intermediate 1,6-chloro-1-hexanol is 50-55 mL: 7-8.5 mmol: 0.96-1.17 g.
7. The salt spray corrosion resistant cable according to claim 1, characterized in that, The preparation method of the disulfide-based polyester is as follows: 5-10 mmol of dithiol dihydroxyacetic acid, 10-20 mmol of pentaerythritol and 0.01-0.02 g of p-toluenesulfonic acid are added to a reaction flask, stirred and mixed, and then 2-3 mL of cyclohexane dehydrating agent is added. The reaction is carried out at 170-180℃ for 2-4 h. After the reaction is completed, the mixture is distilled under reduced pressure and washed with anhydrous ethanol to obtain the disulfide-based polyester.
8. A method for preparing a salt spray corrosion resistant cable as described in any one of claims 1-7, characterized in that, The method for preparing the salt spray corrosion resistant cable is as follows: Step 1: The copper core is stretched multiple times using a wire drawing machine to achieve the required conductor diameter. Then, the conductors are twisted together to form a copper wire core. Step 2: Extrude the insulating material around the copper wire core. After cross-linking, the insulating material forms an insulating layer. Then, continue to wrap the outer sheath layer around the insulating layer to finally obtain a salt spray corrosion resistant cable.