Corrosion-resistant flame-retardant cable and method for manufacturing the same

Abstract

The present application relates to a kind of corrosion-resistant flame-retardant cable and its preparation method, belong to special flame-retardant cable technical field.The cable is composed of bundle core and surface protective sleeve, wherein, protective sleeve includes according to weight parts: PVC resin 100 parts, POE resin 10-15 parts, insulating filler 12-16 parts, toughening agent 25-30 parts, stabilizer 4.8-5.5 parts, modified phosphorus-silicon flame retardant 9-13 parts, antioxidant 0.13-0.16 parts and lubricant 4.5-5.8 parts;Modified phosphorus-silicon flame retardant is replaced by hydroxyl single end capped silicone oil and vinyltrichlorosilane, form the compound with multiple silicon chain and alkenyl, i.e.intermediate, again by DOPO and the alkenyl on the intermediate molecule addition, DOPO is grafted to the intermediate molecule as phosphorus flame-retardant material, it forms a large number of silicon chain-DOPO-PVC laminated structure in the near surface layer of protective sleeve, play shielding anticorrosion and flame-retardant effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of special flame-retardant cables, and particularly relates to a corrosion-resistant flame-retardant cable and a preparation method thereof. BACKGROUND

[0002] Wires and cables play a crucial role in power transmission and signal transmission, and will directly determine the safety of equipment operation. The cable sheath is the outermost layer of the cable, and its basic function is to protect the internal structure.

[0003] Existing cable sheath materials usually include polyvinyl chloride (PVC), polyethylene (PE), and rubber, etc. These materials exhibit good balance in terms of cost and mechanical properties. However, these traditional materials still have defects in terms of chemical corrosion resistance and fire resistance, especially in extreme environmental conditions or special application scenarios. In the prior art, by structural design, metal materials, inorganic insulating materials, etc. are used to fill the cable, which can meet the requirements of flame retardation and corrosion resistance. However, the forming process of such cables is complex, the cost is high, and the quality and volume are large, causing construction difficulties, and they are only applied in special fields. In addition, various flame-retardant materials and corrosion-resistant materials are added to traditional sheath materials to improve the flame-retardant and corrosion-resistant properties of the sheath. However, these materials are difficult to form a stable and continuous insulating layer, and the protection performance of the cable is insufficient. SUMMARY

[0004] In order to solve the technical problems mentioned in the background art, the purpose of the present application is to provide a corrosion-resistant flame-retardant cable and a preparation method thereof.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A corrosion-resistant flame-retardant cable is composed of a bundled core and a protective sheath on the surface, wherein the protective sheath comprises, by weight: 100 parts of PVC resin, 10-15 parts of POE resin, 12-16 parts of insulating filler, 25-30 parts of toughening agent, 4.8-5.5 parts of stabilizer, 9-13 parts of modified phosphorus-silicon flame retardant, 0.13-0.16 parts of antioxidant, and 4.5-5.8 parts of lubricant.

[0007] The modified phosphorus-silicon flame retardant is prepared by the following method:

[0008] Step A1: Mix hydroxyl-terminated silicone oil, triethylamine, and anhydrous tetrahydrofuran, and protect it by passing dry nitrogen. Control the temperature of the water bath at 10-20℃, and apply 120-150rpm stirring. Slowly add vinyltrichlorosilane and react for 2-3h. Then continue to heat to 45-55℃ and react for 1-1.5h. After the reaction is completed, remove the tetrahydrofuran by rotary evaporation to obtain an intermediate.

[0009] Further, the terminal hydroxyl silicone oil is a hydroxyl single-terminated silicone oil, the molecular weight of the obtained modified phosphorus-silicon flame retardant is small, and the modified phosphorus-silicon flame retardant contains a plurality of branched silicon chains and is relatively easy to migrate to the surface of the protective sleeve to form an enrichment layer.

[0010] Further, the feeding ratio of the vinyltrichlorosilane, the hydroxyl content of the terminal hydroxyl silicone oil, the triethylamine, and the anhydrous tetrahydrofuran is 10 mmol: 30 mmol: 3.5-5 mL: 30-40 mL, the triethylamine acts as an acid-binding agent to promote the substitution of the terminal hydroxyl silicone oil with the vinyltrichlorosilane to form a compound having a plurality of silicon chains and alkenyl groups.

[0011] Step A2: The DOPO, the transition metal-based catalyst, and the dimethylformamide are premixed, then the intermediate is added, preheating is performed at 80-90 DEG C, stirring is applied at 60-90 rpm, reaction is performed for 1.5-2 h, then heating is continued at 120-130 DEG C for 2.2-2.8 h, after the reaction is completed, water is added for washing, the water phase is removed, and drying is performed to obtain the modified phosphorus-silicon flame retardant;

[0012] Further, the transition metal-based catalyst is selected from an organic nickel catalyst, preferably bis(1,5-cyclooctadiene)nickel, which has good compatibility with the reaction system, good catalytic effect on the addition of DOPO, and relatively low cost, and has higher application prospects in industrial production.

[0013] Further, the feeding ratio of the intermediate, the DOPO, the transition metal-based catalyst, and the dimethylformamide is 10 g: 2.8-3.5 mmol: 4-6 mg: 15-20 mL, under the catalysis of the transition metal-based catalyst, the DOPO is added to the alkenyl group on the intermediate molecule, and the DOPO is grafted to the intermediate molecule as a phosphorus-based flame retardant material.

[0014] A preparation method of a corrosion-resistant flame-retardant cable, comprising the following steps:

[0015] Step S1: The raw materials are uniformly mixed by using a high-speed mixer, plasticized and blended at 170-180 DEG C, and then discharged and pelletized to obtain a functional masterbatch;

[0016] Step S2: The functional masterbatch is plasticized and extruded by using a double-screw extruder, the temperature zones are set as: zone 1 165-175 DEG C, zone 2 180-190 DEG C, zone 3 190-200 DEG C, zone 4 180-190 DEG C, the die head temperature is 190-200 DEG C, the functional masterbatch is coated onto the surface of the bundled wire core, cooled and wound, and then baked and homogenized at 65-80 DEG C for 1-1.5 h to obtain the corrosion-resistant flame-retardant cable.

[0017] Preferably, the PVC resin is an SG-3 type resin, has high polymerization degree, a compact structure, certain corrosion resistance, and excellent processing performance, and is compatible with the extrusion molding process of the cable.

[0018] Preferably, the lubricant is selected from high-density oxidized polyethylene wax, which has good internal and external lubrication effect on PVC, is beneficial to improve the surface density of the protective sleeve after extrusion, and has a promoting effect on the corrosion resistance of the protective sleeve and the formation of the continuous ablation layer.

[0019] The beneficial effects of the present application are:

[0020] The cable of the present application only consists of a bundled core and a protective sleeve, and has simple structure and forming process, and is suitable for industrial production. The protective sleeve takes PVC as a base body, and is blended and modified by a self-developed modified phosphorus-silicon flame retardant to give good flame retardance and corrosion resistance. The modified phosphorus-silicon flame retardant is formed by replacing hydroxyl single-terminated silicone oil with vinyltrichlorosilane to form a compound with multiple silicon chains and alkenyl groups, i.e. an intermediate, and then adding DOPO to the alkenyl groups on the intermediate molecules, so that DOPO is grafted to the intermediate molecules as a phosphorus-based flame retardant material. The multiple silicon chains on the modified phosphorus-silicon flame retardant molecules have large differences in molecular structure with the PVC base body, and the silicon chain ends migrate to the surface of the protective sleeve during the thermoforming process. Compared with the DOPO end, the PVC base body end has better compatibility, and thus migrates close to the PVC base body end during the migration process. In turn, a large number of silicon chain-DOPO-PVC layered structures are formed in the near-surface layer of the protective sleeve. These silicon-containing layered structures form a surface shielding effect, which hinders the deep corrosion of the protective sleeve by external media, and show good corrosion resistance in tests. Under high-temperature ignition conditions, the DOPO structure is preferentially decomposed and promotes the carbonization of PVC to form an initial carbon layer. As the temperature rises, the silicon chains are decomposed into small chain segment silicon chains or even inorganic silicon attached to the carbon layer, thereby constructing a large number of continuous silicon-carbon flame retardant layers, effectively hindering the penetration of combustion, and hindering the release of smoke and heat, and showing excellent flame retardance in tests. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The heat release rate change curve of the present application;

[0023] Figure 2 The smoke release rate change curve of the present application. DETAILED DESCRIPTION

[0024] With reference to the accompanying drawings on which the embodiments of the application are illustrated, the technical solutions in the embodiments of the application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0025] Example 1, preparation of corrosion-resistant flame-retardant cable, the specific implementation process is as follows:

[0026] (1) Preparation of modified phosphorus-silicon flame retardant

[0027] Step A1: Take the end hydroxyl silicone oil, triethylamine and anhydrous tetrahydrofuran mixture, dry nitrogen protection, water bath control temperature is 20℃, apply 150rpm stirring, slowly add vinyltrichlorosilane reaction 2h, then continue to heat to 55℃ reaction 1h, wherein, the end hydroxyl silicone oil is selected from Anhui Aiyouta Silicone Co., Ltd. IOTA 8861 type hydroxyl single end capped silicone oil, hydroxyl value 40.5KOHmg / g, the feeding ratio of vinyltrichlorosilane, the hydroxyl content of end hydroxyl silicone oil, triethylamine and anhydrous tetrahydrofuran is 10mmol: 30mmol: 5mL: 40mL, the reaction is finished by rotary evaporation to remove tetrahydrofuran, and the intermediate is obtained.

[0028] Step A2: Take DOPO, transition metal-based catalyst and dimethylformamide premix, then add the intermediate mixture, preheat to 90℃, apply 90rpm stirring reaction 1.5h, then heat to 130℃ continue to react 2.2h, wherein, the transition metal-based catalyst is selected from organic nickel catalyst bis(1,5-cyclooctadiene) nickel, the feeding ratio of intermediate, DOPO, transition metal-based catalyst and dimethylformamide is 10g: 3.5mmol: 6mg: 20mL, after the reaction is finished, the reaction system is washed with water with mass three times, and the water phase is removed after standing and drying the substrate, and the modified phosphorus-silicon flame retardant is obtained.

[0029] (2) Preparation of corrosion-resistant flame-retardant cable

[0030] Ingredients: Take the raw materials according to the weight parts, PVC resin 100 parts, select SG-3 type resin raw material of Xinjiang Tianye (Group) Co., Ltd.; POE resin 13 parts, select 8100 type resin raw material of Dow Chemical; Insulating filler 16 parts, selected from GM-3 type plastic mica powder of Anhui Ge Ray New Material Technology Co., Ltd.; Toughening agent 30 parts, selected from commercial industrial-grade trioctyl trimellitate; Stabilizer 4.8 parts, selected from GP-283 type raw material of Qingdao Guangtu New Material Co., Ltd.; Modified phosphorus-silicon flame retardant 9 parts, self-made by the present example; Antioxidant 0.13 parts, selected from commercial antioxidants 1010 and antioxidants 168 compounded according to weight ratio of 2:1; Lubricant 5.8 parts, selected from ZC-316A type high-density oxidized polyethylene wax of Jiaxing Zhongcheng Environmental Protection Technology Co., Ltd.

[0031] Step S1: Put each raw material according to the weight parts into the high-speed mixer, mix at 600 rpm for 10 min, then transfer the mixture into the torque rheometer, control the temperature at 170℃, the stirring speed at 40 rpm, plasticize and blend the mixture for 19 min, the torque tends to be stable, discharge and granulate, get the functional masterbatch.

[0032] Step S2: Put the functional masterbatch into the twin-screw extruder, set the barrel temperature of the twin-screw extruder as follows: Zone 1 165℃, Zone 2 180℃, Zone 3 190℃, Zone 4 180℃, the die temperature at 190℃, coat the functional masterbatch to the surface of the bundled wire core, cool and wind, then bake at 65℃ for 1.5h, get the corrosion-resistant flame-retardant cable.

[0033] Example 2, preparation of corrosion-resistant flame-retardant cable, the specific implementation process is as follows:

[0034] (1) Preparation of modified phosphorus-silicon flame retardant

[0035] Step A1: Mix hydroxyl-terminated silicone oil, triethylamine and anhydrous tetrahydrofuran, protect with dry nitrogen, control the temperature with water bath at 10℃, apply 120 rpm stirring, slowly add vinyltrichlorosilane and react for 3h, then continue to heat to 45℃ for 1.5h, wherein the hydroxyl-terminated silicone oil is selected from IOTA 8861 type hydroxyl-terminated silicone oil of Anhui Aiotasil Silicone Co., Ltd., with a hydroxyl value of 40.5KOHmg / g, the feeding ratio of vinyltrichlorosilane, hydroxyl content of hydroxyl-terminated silicone oil, triethylamine and anhydrous tetrahydrofuran is 10mmol:30mmol:3.5mL:30mL, after the reaction, remove tetrahydrofuran by rotary evaporation, get the intermediate.

[0036] Step A2: take DOPO, transition metal-based catalyst and dimethyl formamide, pre-mix, then add the intermediate, pre-warm to 80℃, apply 60rpm stirring reaction 2h, then warm up to 120℃ continue to react 2.8h, wherein the transition metal-based catalyst is selected from organic nickel catalyst bis(1,5-cyclooctadiene) nickel, the feeding ratio of intermediate, DOPO, transition metal-based catalyst and dimethyl formamide is 10g:2.8mmol:4mg:15mL, after the reaction, add water to the reaction system with a mass of three times, wash, stand and remove the water phase, then dry the substrate to obtain the modified phosphorus-silicon flame retardant.

[0037] (2) Preparation of corrosion-resistant flame-retardant cable

[0038] Ingredients: take raw materials according to weight parts, PVC resin 100 parts, select SG-3 resin raw material of Xinjiang Tianye (Group) Co., Ltd.; POE resin 10 parts, select 8100 resin raw material of Dow Chemical; insulating filler 14 parts, selected from GM-3 type plastic mica powder of Anhui Ge Ray New Material Technology Co., Ltd.; toughening agent 25 parts, selected from commercial industrial-grade trioctyl trimellitate; stabilizer 5.5 parts, selected from GP-283 type raw material of Qingdao Guangtu New Material Co., Ltd.; modified phosphorus-silicon flame retardant 11 parts, self-made by this embodiment; antioxidant 0.16 parts, selected from commercial antioxidants 1010 and antioxidants 168 compounded according to weight ratio of 2:1; lubricant 4.5 parts, selected from ZC-316A type high-density oxidized polyethylene wax of Jiaxing Zhongcheng Environmental Protection Technology Co., Ltd.

[0039] Step S1: add each raw material according to the weight ratio to the high-speed mixer, mix at 600rpm for 10min, then transfer the mixture to the torque rheometer, control the temperature at 180℃, and the stirring speed at 40rpm, plasticize and blend the mixture for 16min, the torque tends to be stable, discharge and pelletize, to obtain the functional masterbatch.

[0040] Step S2: add the functional masterbatch to the twin-screw extruder, set the barrel temperature of the twin-screw extruder to: Zone 1 175℃, Zone 2 190℃, Zone 3 200℃, Zone 4 190℃, and the die temperature to 200℃, coat the functional masterbatch onto the surface of the bundled wire core, cool and wind, then bake at 80℃ for 1h to obtain the corrosion-resistant flame-retardant cable.

[0041] Example 3, preparation of corrosion-resistant flame-retardant cable, the specific implementation process is as follows:

[0042] (1) Preparation of modified phosphorus-silicon flame retardant

[0043] Step A1: Take the end hydroxyl silicone oil, triethylamine and anhydrous tetrahydrofuran mixture, dry nitrogen protection, water bath control temperature is 15℃, apply 150rpm stirring, slowly add vinyltrichlorosilane reaction 2.2h, then continue to warm up to 50℃ reaction 1.3h, wherein, the end hydroxyl silicone oil is selected from Anhui Aiyouta Silicone Co., Ltd. IOTA 8861 type hydroxyl single-ended silicone oil, hydroxyl value 40.5KOHmg / g, the feeding ratio of vinyltrichlorosilane, the hydroxyl content of the end hydroxyl silicone oil, triethylamine and anhydrous tetrahydrofuran is 10mmol:30mmol:4mL:40mL, the reaction is finished by rotary evaporation to remove tetrahydrofuran, and the intermediate is obtained.

[0044] Step A2: Take the DOPO, transition metal-based catalyst and dimethylformamide premix, then add the intermediate mixture, preheat to 85℃, apply 90rpm stirring reaction 1.8h, then warm up to 120℃ continue reaction 2.6h, wherein, the transition metal-based catalyst is selected from organic nickel catalyst bis(1,5-cyclooctadiene)nickel, the feeding ratio of the intermediate, DOPO, transition metal-based catalyst and dimethylformamide is 10g:3.2mmol:5mg:20mL, after the reaction is finished, add water to the reaction system with a mass of three times the washing, stand and remove the water phase, then dry the substrate to obtain the modified phosphorus-silicon flame retardant.

[0045] (2) Preparation of corrosion-resistant flame-retardant cable

[0046] Ingredients: take the raw materials according to weight parts, PVC resin 100 parts, select SG-3 type resin raw material of Xinjiang Tianye (Group) Co., Ltd.; POE resin 15 parts, select 8100 type resin raw material of Dow Chemical; insulating filler 12 parts, selected from GM-3 type plastic mica powder of Anhui Gexie New Material Technology Co., Ltd.; toughening agent 28 parts, selected from commercial industrial-grade trioctyl trimellitate; stabilizer 5.2 parts, selected from GP-283 type raw material of Qingdao Guangtu New Material Co., Ltd.; modified phosphorus-silicon flame retardant 13 parts, self-made by this embodiment; antioxidant 0.15 parts, selected from commercial antioxidants 1010 and antioxidants 168 compounded according to weight ratio of 2:1; lubricant 5.5 parts, selected from ZC-316A type high-density oxidized polyethylene wax of Jiaxing Zhongcheng Environmental Protection Technology Co., Ltd.

[0047] Step S1: add the above raw materials to the high-speed mixer according to the weight ratio, mix at 600rpm for 10min, then transfer the mixture to the torque rheometer, control the temperature at 180℃, and stir at 40rpm for 17min. When the torque tends to be stable, discharge and granulate to obtain the functional masterbatch.

[0048] Step S2: The functional master batch was added to the twin-screw extruder, and the barrel temperature zone of the twin-screw extruder was set to: Zone 1 170℃, Zone 2 185℃, Zone 3 200℃, Zone 4 185℃, and the die head temperature was 200℃. The functional master batch was coated onto the surface of the bundled wire core, cooled and rolled, and then baked at 70℃ for 1.2h to obtain the corrosion-resistant flame-retardant cable.

[0049] Comparative Example 1

[0050] In this comparative example, the modified phosphorus-silicon flame retardant was replaced by 11 parts of IOTA 8861 type hydroxyl single-terminated silicone oil and 2 parts of DOPO, and the rest of the implementation process was the same as that of Example 3.

[0051] Comparative Example 2

[0052] In this comparative example, the modified phosphorus-silicon flame retardant was replaced by 10 parts of GT-150P type halogen-free cable organic silicon additive from Zhejiang Jiahua Fine Chemical Co., Ltd. and 3 parts of DOPO, and the rest of the implementation process was the same as that of Example 3.

[0053] In order to detect the protective effect of the protective sleeve on the cable, the functional master batch prepared above was hot-pressed into a sheet using a flat vulcanizing machine at 190℃ and 5MPa, and baked at 80℃ for 1.5h. A 3mm thick sample was taken, and the vertical burning test was performed according to the GB / T2048-2021 standard, and the limiting oxygen index test was performed according to the ASTM D2683 standard. The specific test results are shown in Table 1:

[0054] Table 1

[0055] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Flame retardant class V-0 V-0 V-0 V-1 V-1 Oxygen index / % 29.7 29.2 30.7 26.1 27.5

[0056] As can be seen from the test results in Table 1, the flame-retardant grade of the protective sleeve of the cable prepared in the examples all reached V-0 level, and the oxygen index reached more than 29%, which had excellent flame retardancy.

[0057] A sample was taken from the sheet above, and the original weight was measured and recorded as M0. A 5% mass fraction sodium hydroxide aqueous solution, a 5% mass fraction sulfuric acid aqueous solution and a 20% mass fraction sodium chloride aqueous solution were prepared respectively. The sample was immersed at room temperature for 72h, and then a scrubbing test was performed on both sides of the sample using a scrubbing tester. The scrubbing material was nylon cloth, the scrubbing load was 1.5kg, the scrubbing agent was water, and the scrubbing time was 10min. After scrubbing, the sample was rinsed and dried at 50℃ hot air for 3h. The weight after corrosion was measured and recorded as M1. The corrosion weight loss rate L was calculated as (M0-M1) / M0x100%; The specific test results are shown in Table 2:

[0058] Table 2

[0059] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 L(NaOH) / % 3.74 3.52 3.19 3.05 5.53 [CAT] L(H2SO 4) / %]]> 5.53 5.49 5.07 5.32 8.44 L(NaCI) / % 0.71 0.69 0.76 1.02 0.81

[0060] From the test results in Table 2, it can be seen that the sheath of the cable prepared in Example has good resistance to common corrosive media such as acid, alkali and salt, and exhibits good corrosion resistance.

[0061] Based on the above test results, samples were taken from the sheets of Example 3, Comparative Example 1 and Comparative Example 2, and cone calorimetry tests were performed in accordance with the ISO 5660-1 standard, and the heat of combustion and smoke release test data are shown in Table 3, Figure 1 and Figure 2 are the change curves of heat release rate and smoke release rate, respectively;

[0062] Table 3

[0063]

[0064]

[0065] From Table 3, it can be seen that the sheath of the cable prepared in Example 3 has lower heat release and smoke release in the sustained ignition state, and has lower harmful effects in the fire environment. In combination with Figure 1 and Figure 2 , the ignition time of Example 3 lags behind that of Comparative Examples 1 and 2, and the heat release and smoke release rates slowly increase during the sustained ignition process, indicating that a uniform ablation layer can be formed in the ignition state, and the ablation layer is a slow peeling failure, which inhibits the distance release of smoke and heat.

[0066] In the description of the specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] The above is only an example and description of the concept of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined by the present claims, which shall be within the protection scope of the present application.

Claims

1. A corrosion-resistant flame-retardant cable, consisting of a bundled wire core and a protective sheath on the surface, characterized in that: The protective cover comprises, by weight, 100 parts of PVC resin, 10-15 parts of POE resin, 12-16 parts of insulating filler, 25-30 parts of trioctyl trimellitate, 4.8-5.5 parts of stabilizer, 9-13 parts of modified phosphorus silicon flame retardant, 0.13-0.16 parts of antioxidant and 4.5-5.8 parts of lubricant; The modified phosphorus silicon flame retardant is prepared by the following method: Step A1: Mix hydroxy-terminated silicone oil, triethylamine, and anhydrous tetrahydrofuran, introduce dry nitrogen protection, control the temperature in a water bath at 10-20°C, stir, and slowly add vinyltrichlorosilane to react for 2-3 hours. Then, continue to raise the temperature to 45-55°C and react for 1-1.5 hours. After the reaction, remove tetrahydrofuran by rotary evaporation to obtain an intermediate; Step A2: DOPO, a transition metal-based catalyst, and dimethylformamide are premixed, and then the intermediate is added and mixed. The mixture is preheated to 80-90° C. and stirred for reaction for 1.5-2 hours. The mixture is then heated to 120-130° C. and continued to react for 2.2-2.8 hours. After the reaction is completed, water is added to wash the mixture, the aqueous phase is removed, and the mixture is dried to obtain a modified phosphorus silicon flame retardant. The hydroxyl-terminated silicone oil is a hydroxyl-terminated silicone oil.

2. The corrosion-resistant flame-retardant cable according to claim 1, characterized in that: The feeding ratio of vinyltrichlorosilane, the hydroxyl content of the hydroxyl-terminated silicone oil, triethylamine and anhydrous tetrahydrofuran is 10 mmol: 30 mmol: 3.5-5 mL: 30-40 mL.

3. The corrosion-resistant flame-retardant cable according to claim 2, characterized in that: The feed ratio of the intermediate, DOPO, transition metal-based catalyst and dimethylformamide is 10 g: 2.8-3.5 mmol: 4-6 mg: 15-20 mL.

4. The corrosion-resistant flame-retardant cable according to claim 3, characterized in that: The transition metal-based catalyst is bis(1,5-cyclooctadiene)nickel.

5. The corrosion-resistant flame-retardant cable according to claim 1, characterized in that: The PVC resin is SG-3 type resin.

6. The corrosion-resistant flame-retardant cable according to claim 1, characterized in that: The lubricant is high-density oxidized polyethylene wax.

7. The method for preparing a corrosion-resistant flame-retardant cable according to any one of claims 1 to 6, characterized in that: The steps include: Step S1: Mix the raw materials in a high-speed mixer, plasticize and blend at 170-180°C, and then cut into pellets to obtain functional masterbatch; Step S2: The functional masterbatch is plasticized and extruded using a twin-screw extruder. The temperature zones are set to: zone 1 165-175°C, zone 2 180-190°C, zone 3 190-200°C, zone 4 180-190°C, and the die temperature is 190-200°C. The functional masterbatch is coated on the surface of the bundled wire core, cooled and rolled, and then baked and homogenized at 65-80°C for 1-1.5 hours to obtain a corrosion-resistant and flame-retardant cable.

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