High-temperature-resistant ultraviolet-resistant flexible fireproof cable and processing technology thereof

Abstract

The invention relates to the technical field of cable materials, in particular to a high-temperature-resistant and ultraviolet-resistant flexible fireproof cable and a processing technology thereof. The cable protection sleeve is obtained by mixing chloroprene rubber, ethylene propylene rubber, flame-retardant modified zinc oxide, a flame-retardant modified ZnO-LDH material, a vulcanizing agent, a plasticizer, an anti-aging agent and mica powder and performing high-temperature mixing. And then sequentially preparing a polydopamine layer and a phosphorus-doped polyaniline layer on the surface of the cable protection sleeve to obtain the efficient flame-retardant cable protection sleeve. A mica tape is tightly wrapped on the surface of a copper conductor in a spiral shape, and then an inorganic mineral filling material is filled in a gap around the copper conductor wrapped with the mica tape; obtaining a cable core; and sequentially wrapping the inorganic wrapping tape, the embossed copper sheath and the efficient flame-retardant cable protection sleeve on the cable core to obtain a finished product. The finished product prepared by the invention has good flame retardance and ultraviolet resistance, so that the cable material has a wide application prospect in the technical field of cable materials.

Description

Technical Field

[0001] The invention relates to the technical field of cable materials, in particular to a high temperature resistant and ultraviolet resistant flexible fireproof cable and a processing technology thereof. Background Art

[0002] As one of the infrastructures of modern society, cables play a vital role in many fields and have extremely high modern value. In the process of industrial automation, cables connect various devices and systems to realize data collection, transmission and control. Through cables, industrial robots can perform tasks accurately and automated production lines can operate efficiently, greatly improving production efficiency and product quality. It is the cornerstone of industrial intelligence and promotes the development of manufacturing industry towards high-end and intelligent directions. In the field of transportation, cables provide power support for electric vehicle charging facilities, rail transit, etc., to promote green travel and efficient transportation. In the field of construction, cables provide power and communication guarantee for intelligent building systems, realizing automated management and comfortable living of buildings.

[0003] Cables in outdoor environments are exposed to sunlight for a long time, and ultraviolet rays will damage the outer sheath and other materials of the cable. Ultraviolet radiation will change the molecular structure of the material, causing the material to become brittle and crack, which will affect the overall performance of the cable. Once the outer sheath is damaged, impurities such as moisture and dust can easily enter the cable, destroy the insulation layer, and reduce the electrical performance of the cable. In addition, in crowded places such as buildings and vehicles, once a fire occurs, ordinary cables are easy to burn and release a large amount of toxic smoke, which will not only aggravate the spread of the fire, but also greatly hinder the evacuation and rescue of personnel. Cables with good flame retardant properties can effectively suppress the spread of fire, reduce the release of smoke and toxic gases, buy precious time for personnel evacuation and fire rescue, and minimize the losses caused by fire.

[0004] In order to overcome the defects of the prior art, the present invention provides a high temperature resistant and ultraviolet resistant flexible fireproof cable and a processing technology thereof. Summary of the invention

[0005] The object of the present invention is to provide a high temperature resistant and ultraviolet resistant flexible fireproof cable and a processing technology thereof, so as to solve the problems in the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A processing technology for high temperature resistant and ultraviolet resistant flexible fireproof cable comprises the following steps: Step 1: Add nano zinc oxide and γ-aminopropyltriethoxysilane as main raw materials to obtain a modified zinc oxide solution; uniformly disperse cyanuric chloride in N,N-dimethylformamide to obtain a cyanuric chloride solution; drop the cyanuric chloride solution into the modified zinc oxide solution, add triethylamine, stir and react at 90-95° C. for 12-15 hours to obtain a flame-retardant modified zinc oxide; Step 2: Add nano zinc oxide, polyvinyl pyrrolidone, hexahydrate cobalt nitrate solution, 2-methylimidazole solution, hexahydrate nickel nitrate solution, and γ-glycidyloxypropyltrimethoxysilane as main raw materials to obtain a modified ZnO-LDH material; in a nitrogen atmosphere, heat 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide at 130-140° C. until it is melted, then add the modified ZnO-LDH material and triphenylphosphine, stir and react at 130-140° C. for 10-12 hours, and dry after the reaction to obtain a flame-retardant modified ZnO-LDH material; Step 3: Mix chloroprene rubber, ethylene propylene rubber, flame retardant modified zinc oxide, flame retardant modified ZnO-LDH material, vulcanizer, plasticizer, antioxidant and mica powder, and knead at 140-160°C for 35-50 minutes to obtain a cable protective sheath; then prepare a polydopamine layer and a phosphorus-doped polyaniline layer on the surface of the cable protective sheath in sequence to obtain a high-efficiency flame retardant cable protective sheath; tightly wrap the mica tape on the surface of the copper conductor in a spiral shape, and then fill the inorganic mineral filling material into the gap around the copper conductor wrapped with the mica tape; obtain a cable core; and wrap the inorganic tape, embossed copper sheath, and high-efficiency flame retardant cable protective sheath on the cable core in sequence to obtain a finished product.

[0007] More optimally, in step one, the specific preparation process of the modified zinc oxide solution is: adding γ-aminopropyltriethoxysilane to a mixed solvent, ultrasonically dispersing it uniformly to obtain a silane coupling agent solution 1; adding nano zinc oxide to anhydrous ethanol, ultrasonically dispersing it uniformly, heating it to 75-80°C, then dripping the silane coupling agent solution 1 and continuing the reaction for 4-5 hours, and after the reaction is completed, centrifuging, washing, and vacuum drying to obtain modified zinc oxide 1; adding the modified zinc oxide 1 to N,N-dimethylformamide, ultrasonically dispersing it uniformly to obtain a modified zinc oxide solution.

[0008] More optimally, the mixed solvent is composed of anhydrous ethanol and water in a volume ratio of (10-12):1; the reaction mass ratio of nano zinc oxide, γ-aminopropyltriethoxysilane and cyanuric chloride is 10:1:(2-3).

[0009] More optimally, in step 2, when preparing the flame-retardant modified ZnO-LDH material, the reaction mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and the modified ZnO-LDH material is 1:(13-15).

[0010] More optimally, the specific preparation process of the modified ZnO-LDH material is as follows: adding nano zinc oxide and polyvinyl pyrrolidone to deionized water, stirring and reacting at 25-30°C for 25-30 hours, washing and drying after the reaction to obtain modified zinc oxide 2; dissolving cobalt nitrate hexahydrate in methanol to obtain cobalt nitrate hexahydrate solution; dissolving 2-methylimidazole in methanol to obtain 2-methylimidazole solution; adding modified zinc oxide 2 to methanol, ultrasonically dispersing for 10-15 minutes, adding cobalt nitrate hexahydrate solution and stirring for 30-40 minutes, adding 2-methylimidazole solution after stirring, standing for reaction for 25-30 hours, filtering, washing, drying and grinding after the reaction to obtain ZnO-MOF material; Nickel nitrate hexahydrate was dissolved in ethanol to obtain nickel nitrate hexahydrate solution; ZnO-MOF material was added to ethanol, ultrasonically dispersed for 10-15 minutes, and then nickel nitrate hexahydrate solution was added, stirred evenly, and then hydrothermally reacted at 90-95°C for 2-3 hours. After the reaction, the ZnO-LDH material was obtained by centrifugation, washing, drying and grinding; under nitrogen atmosphere, the ZnO-LDH material was added to anhydrous ethanol, ultrasonically dispersed evenly, and then heated to 60-70°C, and then silane coupling agent solution 2 was added dropwise and the pH was adjusted to 3.0-3.5, and the reaction was carried out for 8-10 hours. After the reaction, the modified ZnO-LDH material was obtained by filtration, washing and vacuum drying.

[0011] More optimally, when preparing modified zinc oxide 2, the reaction mass ratio of nano zinc oxide and polyvinyl pyrrolidone is (1-1.2):4; when preparing ZnO-MOF material, the reaction mass ratio of modified zinc oxide 2, cobalt nitrate hexahydrate, and 2-methylimidazole is 1:10:(12.5-13.0); when preparing ZnO-LDH material, the reaction mass ratio of ZnO-MOF material and nickel nitrate hexahydrate is 1:(4.8-5.0); when preparing modified ZnO-LDH material, the reaction mass ratio of ZnO-LDH material and γ-glycidyloxypropyltrimethoxysilane is (12-14):1; γ-glycidyloxypropyltrimethoxysilane is added to a mixed solvent and ultrasonically dispersed uniformly to obtain a silane coupling agent solution 2; the mixed solvent consists of anhydrous ethanol and water in a volume ratio of (10-12):1.

[0012] More optimally, in step three, the contents of the components of the cable protective sheath are: by mass, 30-40 parts of chloroprene rubber, 20-30 parts of ethylene-propylene rubber, 3-8 parts of flame-retardant modified zinc oxide, 4-10 parts of flame-retardant modified ZnO-LDH material, 3-5 parts of vulcanizing agent, 4-7 parts of plasticizer, 0.4-1.2 parts of antioxidant, 5-10 parts of mica powder; the vulcanizing agent is sulfur; the plasticizer is dioctyl phthalate; the antioxidant is 2,6-di-tert-butyl-4-methylphenol.

[0013] More optimally, in step three, the specific preparation process of the high-efficiency flame-retardant cable protective sheath is: dissolving dopamine in deionized water, and then adding tris(hydroxymethylaminomethane) and tris(hydroxymethylaminomethane) hydrochloride to obtain a dopamine buffer solution with a pH of 8.5-8.7; immersing the cable protective sheath in the dopamine buffer solution for 10-15 hours to obtain a polydopamine layer; adding phytic acid dropwise into the aniline solution, and then adding an aqueous solution of ammonium persulfate to obtain an aniline reaction solution; further immersing the cable protective sheath in the aniline reaction solution, stirring the reaction at 0-5°C for 12-15 hours to obtain a phosphorus-doped polyaniline layer, and finally obtaining a high-efficiency flame-retardant cable protective sheath.

[0014] More optimally, when preparing the polydopamine layer, the mass volume ratio of dopamine and deionized water is (0.004-0.005) g:2 mL; when preparing the phosphorus-doped polyaniline layer, the concentration of phytic acid in the aniline reaction solution is 0.15-0.17 mol / L, the concentration of aniline is 0.45-0.50 mol / L, and the concentration of ammonium persulfate is 0.62-0.65 mol / L.

[0015] More optimally, in step three, the copper conductor and the embossed copper sheath are both made of red copper.

[0016] Beneficial effects of the present invention: The feature of the present invention is that in step 1, flame retardant modified zinc oxide is obtained by adding nano zinc oxide, γ-aminopropyl triethoxysilane and cyanuric chloride. In this step, γ-aminopropyl triethoxysilane is used to modify nano zinc oxide, which can improve the dispersibility of nano zinc oxide on the one hand, and introduce amino groups to react with cyanuric chloride to undergo nucleophilic substitution reaction on the other hand, so as to obtain flame retardant modified zinc oxide. Nano zinc oxide itself has good anti-ultraviolet aging performance, and the modification by γ-aminopropyl triethoxysilane and cyanuric chloride not only improves the dispersibility of zinc oxide, so that it can better play an anti-ultraviolet role, but also introduces a triazine ring structure with good flame retardant performance, so the flame retardant modified zinc oxide has good anti-ultraviolet aging performance and flame retardant performance at the same time.

[0017] The present invention is characterized in that, in step 2, a flame retardant modified ZnO-LDH material is obtained by adding nano zinc oxide, polyvinyl pyrrolidone, hexahydrate cobalt nitrate solution, 2-methylimidazole solution, hexahydrate nickel nitrate solution, γ-glycidyloxypropyltrimethoxysilane, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. In this step, a ZnO-LDH core-shell material with nano zinc oxide as a core and a hydrotalcite material as a shell is first prepared, and then the ZnO-LDH core-shell material containing hydroxyl groups on the surface is modified by γ-glycidyloxypropyltrimethoxysilane to obtain a modified ZnO-LDH material. Then, by modification treatment with a silane coupling agent, an epoxy group can be introduced on the surface of the ZnO-LDH material, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added to further react with the epoxy group to obtain a flame retardant modified ZnO-LDH material. Among them, the unique layered structure of hydrotalcite (LDH) can reduce the penetration of ultraviolet rays by reflecting and scattering ultraviolet rays, and has the ability to resist ultraviolet aging. Therefore, by preparing ZnO-LDH core-shell materials, the anti-ultraviolet aging advantages of nano zinc oxide and hydrotalcite are combined, so that the material has good stability in ultraviolet environment. The silane coupling agent is modified to introduce epoxy groups and react with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and the flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with excellent flame retardant properties is fixed on the surface of the material, which significantly improves the flame retardant properties of the material. Therefore, the flame retardant modified ZnO-LDH material has both good anti-ultraviolet aging properties and flame retardant properties.

[0018] The present invention is characterized in that, in step three, chloroprene rubber, ethylene-propylene rubber, flame-retardant modified zinc oxide, flame-retardant modified ZnO-LDH material, vulcanizing agent, plasticizer, antioxidant and mica powder are mixed, and high-temperature mixing is performed to obtain a cable protective sleeve; then a polydopamine layer and a phosphorus-doped polyaniline layer are sequentially prepared on the surface of the cable protective sleeve to obtain a high-efficiency flame-retardant cable protective sleeve; the mica tape is tightly wrapped around the surface of the copper conductor in a spiral shape, and then the inorganic mineral filling material is filled into the gap around the copper conductor wrapped with the mica tape; a cable core is obtained; the inorganic tape, the embossed copper sheath, and the high-efficiency flame-retardant cable protective sleeve are sequentially wrapped on the cable core to obtain a finished product. In summary, the finished product prepared by the present invention has good flame retardancy and UV resistance, and therefore has broad application prospects in the field of cable material technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is the structural diagram of the finished cable of the present invention; In the figure: 1: mica tape, 2: copper conductor, 3: inorganic tape, 4: embossed copper sheath, 5: high-efficiency flame-retardant cable protective sheath; 6: inorganic mineral filling material. DETAILED DESCRIPTION

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

[0021] Source of raw materials: Nano zinc oxide, provided by Nanjing Baoket New Materials Co., Ltd., with a specification of 30nm; chloroprene rubber, provided by Guangzhou Zhongce Trading Co., Ltd., with a model of CR244; ethylene propylene rubber, provided by Shanghai Bangsu New Materials Co., Ltd., with a model of EPDM; mica powder, provided by Shijiazhuang Mayue Building Materials Co., Ltd., with a specification of 200 mesh; mica tape, provided by Kunyi Cable Co., Ltd., with a model of YTTW; the inorganic mineral filling material is specifically kaolin, provided by Lingshou County Jiaao Mineral Products Co., Ltd., with a mesh of 325; the inorganic bag tape is specifically a ceramic fireproof silicone tape, provided by Shenzhen Lemei Silicon Co., Ltd., with a model of LMS; in terms of mass, one portion is 1g.

[0022] Example 1: Step 1: Add γ-aminopropyltriethoxysilane to a mixed solvent, disperse it evenly by ultrasonication, and obtain a silane coupling agent solution 1; add nano zinc oxide to anhydrous ethanol, disperse it evenly by ultrasonication, and then heat it to 80°C, then drop the silane coupling agent solution 1 and continue to react for 5 hours. After the reaction is completed, centrifuge, wash, and vacuum dry to obtain a modified zinc oxide 1; add the modified zinc oxide 1 to N,N-dimethylformamide, disperse it evenly by ultrasonication, and obtain a modified zinc oxide solution; uniformly disperse cyanuric chloride in N,N-dimethylformamide to obtain a cyanuric chloride solution; drop the cyanuric chloride solution into the modified zinc oxide solution, then add triethylamine, and stir the reaction at 95°C for 15 hours to obtain a flame-retardant modified zinc oxide; The mixed solvent is composed of anhydrous ethanol and water, with a volume ratio of 10:1; the reaction mass ratio of nano zinc oxide, γ-aminopropyltriethoxysilane and cyanuric chloride is 10:1:2.5; Step 2: Add nano zinc oxide and polyvinyl pyrrolidone to deionized water, stir and react at 30°C for 30 hours, wash and dry after the reaction to obtain modified zinc oxide 2; dissolve cobalt nitrate hexahydrate in methanol to obtain cobalt nitrate hexahydrate solution; dissolve 2-methylimidazole in methanol to obtain 2-methylimidazole solution; add modified zinc oxide 2 to methanol, ultrasonically disperse for 15 minutes, add cobalt nitrate hexahydrate solution and stir for 40 minutes, add 2-methylimidazole solution after stirring, let stand for reaction for 30 hours, filter, wash, dry and grind after the reaction to obtain ZnO-MOF material; dissolve nickel nitrate hexahydrate in ethanol to obtain nickel nitrate hexahydrate solution; add ZnO-MOF material to ethanol, ultrasonically disperse for 15 minutes, add nickel nitrate hexahydrate solution, stir evenly and hydrothermally react at 95°C for 3 hours, centrifuge, wash, dry and grind after the reaction to obtain ZnO-LDH material; Add γ-glycidyloxypropyltrimethoxysilane to the mixed solvent, disperse it evenly by ultrasonication, and obtain silane coupling agent solution 2; under a nitrogen atmosphere, add the ZnO-LDH material to anhydrous ethanol, disperse it evenly by ultrasonication, and then heat it to 70°C, then drop the silane coupling agent solution 2 and adjust the pH to 3.5, react for 10 hours, and after the reaction is completed, filter, wash, and vacuum dry to obtain a modified ZnO-LDH material; under a nitrogen atmosphere, heat 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide at 140°C until it is melted, then add the modified ZnO-LDH material and triphenylphosphine, stir and react at 140°C for 12 hours, and after the reaction is completed, dry to obtain a flame-retardant modified ZnO-LDH material; The mixed solvent is composed of anhydrous ethanol and water in a volume ratio of 10:1; when preparing modified zinc oxide 2, the reaction mass ratio of nano zinc oxide and polyvinyl pyrrolidone is 1.1:4; when preparing ZnO-MOF material, the reaction mass ratio of modified zinc oxide 2, cobalt nitrate hexahydrate, and 2-methylimidazole is 1:10:12.7; when preparing ZnO-LDH material, the reaction mass ratio of ZnO-MOF material and nickel nitrate hexahydrate is 1:4.9; when preparing modified ZnO-LDH material, the reaction mass ratio of ZnO-LDH material and γ-glycidyloxypropyltrimethoxysilane is 13:1; when preparing flame-retardant modified ZnO-LDH material, the reaction mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and modified ZnO-LDH material is 1:14; Step 3: 30g of chloroprene rubber, 20g of ethylene propylene rubber, 3g of flame retardant modified zinc oxide, 5g of flame retardant modified ZnO-LDH material, 3g of vulcanizing agent sulfur, 4g of dioctyl phthalate, 0.4g of 2,6-di-tert-butyl-4-methylphenol and 5g of mica powder were mixed and kneaded at 160°C for 50min to obtain a cable protective sheath; Dopamine is dissolved in deionized water, and tris(hydroxymethylaminomethane) and tris(hydroxymethylaminomethane) hydrochloride are added to obtain a dopamine buffer solution with a pH value of 8.7; the cable protective sheath is immersed in the dopamine buffer solution for 15 hours to obtain a polydopamine layer; phytic acid is added dropwise to the aniline solution, and then an aqueous ammonium persulfate solution is added to obtain an aniline reaction solution; the cable protective sheath is further immersed in the aniline reaction solution, and stirred at 5°C for 15 hours to obtain a phosphorus-doped polyaniline layer, and finally a high-efficiency flame-retardant cable protective sheath 5 is obtained; the mica tape 1 is tightly wrapped around the surface of the copper conductor 2 in a spiral shape, and then an inorganic mineral filling material 6 is filled into the gap around the copper conductor 2 wrapped with the mica tape 1; a cable core is obtained; the inorganic tape 3, the embossed copper sheath 4, and the high-efficiency flame-retardant cable protective sheath 5 are sequentially wrapped on the cable core to obtain a finished product; When preparing the polydopamine layer, the mass volume ratio of dopamine and deionized water is 0.004g:2mL; when preparing the phosphorus-doped polyaniline layer, the concentration of phytic acid in the aniline reaction solution is 0.15mol / L, the concentration of aniline is 0.45mol / L, and the concentration of ammonium persulfate is 0.62mol / L.

[0023] Example 2: Step 1: Add γ-aminopropyltriethoxysilane to a mixed solvent, disperse it evenly by ultrasonication, and obtain a silane coupling agent solution 1; add nano zinc oxide to anhydrous ethanol, disperse it evenly by ultrasonication, and then heat it to 77°C, then drop the silane coupling agent solution 1 and continue the reaction for 4.5 hours. After the reaction is completed, centrifuge, wash, and vacuum dry to obtain a modified zinc oxide 1; add the modified zinc oxide 1 to N,N-dimethylformamide, disperse it evenly by ultrasonication, and obtain a modified zinc oxide solution; uniformly disperse cyanuric chloride in N,N-dimethylformamide to obtain a cyanuric chloride solution; drop the cyanuric chloride solution into the modified zinc oxide solution, then add triethylamine, and stir the reaction at 92°C for 14 hours to obtain a flame-retardant modified zinc oxide; The mixed solvent is composed of anhydrous ethanol and water, with a volume ratio of 10:1; the reaction mass ratio of nano zinc oxide, γ-aminopropyltriethoxysilane and cyanuric chloride is 10:1:2.5; Step 2: Add nano zinc oxide and polyvinyl pyrrolidone to deionized water, stir and react at 27°C for 27 hours, wash and dry after the reaction to obtain modified zinc oxide 2; dissolve cobalt nitrate hexahydrate in methanol to obtain cobalt nitrate hexahydrate solution; dissolve 2-methylimidazole in methanol to obtain 2-methylimidazole solution; add modified zinc oxide 2 to methanol, ultrasonically disperse for 13 minutes, add cobalt nitrate hexahydrate solution and stir for 35 minutes, add 2-methylimidazole solution after stirring, let stand for 27 hours, filter, wash, dry and grind after the reaction to obtain ZnO-MOF material; dissolve nickel nitrate hexahydrate in ethanol to obtain nickel nitrate hexahydrate solution; add ZnO-MOF material to ethanol, ultrasonically disperse for 13 minutes, add nickel nitrate hexahydrate solution, stir evenly and hydrothermally react at 93°C for 2.5 hours, centrifuge, wash, dry and grind after the reaction to obtain ZnO-LDH material; Add γ-glycidyloxypropyltrimethoxysilane to the mixed solvent, disperse it evenly by ultrasonication, and obtain silane coupling agent solution 2; under a nitrogen atmosphere, add the ZnO-LDH material to anhydrous ethanol, disperse it evenly by ultrasonication, and then heat it to 65°C, then drop the silane coupling agent solution 2 and adjust the pH to 3.2, react for 9 hours, and after the reaction is completed, filter, wash, and vacuum dry to obtain a modified ZnO-LDH material; under a nitrogen atmosphere, heat 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide at 135°C until it is melted, then add the modified ZnO-LDH material and triphenylphosphine, stir and react at 135°C for 11 hours, and after the reaction is completed, dry to obtain a flame-retardant modified ZnO-LDH material; The mixed solvent is composed of anhydrous ethanol and water in a volume ratio of 10:1; when preparing modified zinc oxide 2, the reaction mass ratio of nano zinc oxide and polyvinyl pyrrolidone is 1.1:4; when preparing ZnO-MOF material, the reaction mass ratio of modified zinc oxide 2, cobalt nitrate hexahydrate, and 2-methylimidazole is 1:10:12.7; when preparing ZnO-LDH material, the reaction mass ratio of ZnO-MOF material and nickel nitrate hexahydrate is 1:4.9; when preparing modified ZnO-LDH material, the reaction mass ratio of ZnO-LDH material and γ-glycidyloxypropyltrimethoxysilane is 13:1; when preparing flame-retardant modified ZnO-LDH material, the reaction mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and modified ZnO-LDH material is 1:14; Step 3: 30g of chloroprene rubber, 20g of ethylene propylene rubber, 3g of flame retardant modified zinc oxide, 5g of flame retardant modified ZnO-LDH material, 3g of vulcanizing agent sulfur, 4g of dioctyl phthalate, 0.4g of 2,6-di-tert-butyl-4-methylphenol and 5g of mica powder were mixed and kneaded at 150°C for 40min to obtain a cable protective sheath; Dopamine is dissolved in deionized water, and tris(hydroxymethylaminomethane) and tris(hydroxymethylaminomethane) hydrochloride are added to obtain a dopamine buffer solution with a pH value of 8.6; the cable protective sheath is immersed in the dopamine buffer solution for 13 hours to obtain a polydopamine layer; phytic acid is added dropwise to the aniline solution, and then an aqueous ammonium persulfate solution is added to obtain an aniline reaction solution; the cable protective sheath is further immersed in the aniline reaction solution, and stirred at 3°C ​​for 13 hours to obtain a phosphorus-doped polyaniline layer, and finally a high-efficiency flame-retardant cable protective sheath 5 is obtained; the mica tape 1 is tightly wrapped around the surface of the copper conductor 2 in a spiral shape, and then an inorganic mineral filling material 6 is filled into the gap around the copper conductor 2 wrapped with the mica tape 1; a cable core is obtained; the inorganic tape 3, the embossed copper sheath 4, and the high-efficiency flame-retardant cable protective sheath 5 are sequentially wrapped on the cable core to obtain a finished product; When preparing the polydopamine layer, the mass volume ratio of dopamine and deionized water is 0.004g:2mL; when preparing the phosphorus-doped polyaniline layer, the concentration of phytic acid in the aniline reaction solution is 0.15mol / L, the concentration of aniline is 0.45mol / L, and the concentration of ammonium persulfate is 0.62mol / L.

[0024] Example 3: Step 1: Add γ-aminopropyltriethoxysilane to a mixed solvent, disperse it evenly by ultrasonication, and obtain a silane coupling agent solution 1; add nano zinc oxide to anhydrous ethanol, disperse it evenly by ultrasonication, and then heat it to 75°C, then drop the silane coupling agent solution 1 and continue to react for 4 hours. After the reaction is completed, centrifuge, wash, and vacuum dry to obtain a modified zinc oxide 1; add the modified zinc oxide 1 to N,N-dimethylformamide, disperse it evenly by ultrasonication, and obtain a modified zinc oxide solution; uniformly disperse cyanuric chloride in N,N-dimethylformamide to obtain a cyanuric chloride solution; drop the cyanuric chloride solution into the modified zinc oxide solution, then add triethylamine, and stir the reaction at 90°C for 12 hours to obtain a flame-retardant modified zinc oxide; The mixed solvent is composed of anhydrous ethanol and water, with a volume ratio of 10:1; the reaction mass ratio of nano zinc oxide, γ-aminopropyltriethoxysilane and cyanuric chloride is 10:1:2.5; Step 2: Add nano zinc oxide and polyvinyl pyrrolidone to deionized water, stir and react at 25°C for 25 hours, wash and dry after the reaction to obtain modified zinc oxide 2; dissolve cobalt nitrate hexahydrate in methanol to obtain cobalt nitrate hexahydrate solution; dissolve 2-methylimidazole in methanol to obtain 2-methylimidazole solution; add modified zinc oxide 2 to methanol, ultrasonically disperse for 10 minutes, add cobalt nitrate hexahydrate solution and stir for 30 minutes, add 2-methylimidazole solution after stirring, let stand for 25 hours, filter, wash, dry and grind after the reaction to obtain ZnO-MOF material; dissolve nickel nitrate hexahydrate in ethanol to obtain nickel nitrate hexahydrate solution; add ZnO-MOF material to ethanol, ultrasonically disperse for 10 minutes, add nickel nitrate hexahydrate solution, stir evenly and hydrothermally react at 90°C for 2 hours, centrifuge, wash, dry and grind after the reaction to obtain ZnO-LDH material; Add γ-glycidyloxypropyltrimethoxysilane to the mixed solvent, disperse it evenly by ultrasonication, and obtain silane coupling agent solution 2; under a nitrogen atmosphere, add the ZnO-LDH material to anhydrous ethanol, disperse it evenly by ultrasonication, and then heat it to 60°C, then drop the silane coupling agent solution 2 and adjust the pH to 3.0, react for 8 hours, and after the reaction is completed, filter, wash, and vacuum dry to obtain a modified ZnO-LDH material; under a nitrogen atmosphere, heat 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide at 130°C until it is melted, then add the modified ZnO-LDH material and triphenylphosphine, stir and react at 130°C for 10 hours, and after the reaction is completed, dry to obtain a flame-retardant modified ZnO-LDH material; The mixed solvent is composed of anhydrous ethanol and water in a volume ratio of 10:1; when preparing modified zinc oxide 2, the reaction mass ratio of nano zinc oxide and polyvinyl pyrrolidone is 1.1:4; when preparing ZnO-MOF material, the reaction mass ratio of modified zinc oxide 2, cobalt nitrate hexahydrate, and 2-methylimidazole is 1:10:12.7; when preparing ZnO-LDH material, the reaction mass ratio of ZnO-MOF material and nickel nitrate hexahydrate is 1:4.9; when preparing modified ZnO-LDH material, the reaction mass ratio of ZnO-LDH material and γ-glycidyloxypropyltrimethoxysilane is 13:1; when preparing flame-retardant modified ZnO-LDH material, the reaction mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and modified ZnO-LDH material is 1:14; Step 3: 30g of chloroprene rubber, 20g of ethylene propylene rubber, 3g of flame retardant modified zinc oxide, 5g of flame retardant modified ZnO-LDH material, 3g of vulcanizing agent sulfur, 4g of dioctyl phthalate, 0.4g of 2,6-di-tert-butyl-4-methylphenol and 5g of mica powder were mixed and kneaded at 140°C for 35min to obtain a cable protective sheath; Dopamine is dissolved in deionized water, and tris(hydroxymethylaminomethane) and tris(hydroxymethylaminomethane) hydrochloride are added to obtain a dopamine buffer solution with a pH value of 8.5; the cable protective sheath is immersed in the dopamine buffer solution for 10 hours to obtain a polydopamine layer; phytic acid is added dropwise to the aniline solution, and then an aqueous ammonium persulfate solution is added to obtain an aniline reaction solution; the cable protective sheath is further immersed in the aniline reaction solution, and stirred at 0°C for 12 hours to obtain a phosphorus-doped polyaniline layer, and finally a high-efficiency flame-retardant cable protective sheath 5 is obtained; the mica tape 1 is tightly wrapped around the surface of the copper conductor 2 in a spiral shape, and then an inorganic mineral filling material 6 is filled into the gap around the copper conductor 2 wrapped with the mica tape 1; a cable core is obtained; the inorganic tape 3, the embossed copper sheath 4, and the high-efficiency flame-retardant cable protective sheath 5 are sequentially wrapped on the cable core to obtain a finished product; When preparing the polydopamine layer, the mass volume ratio of dopamine and deionized water is 0.004g:2mL; when preparing the phosphorus-doped polyaniline layer, the concentration of phytic acid in the aniline reaction solution is 0.15mol / L, the concentration of aniline is 0.45mol / L, and the concentration of ammonium persulfate is 0.62mol / L.

[0025] Comparative Example 1: The flame retardant modified zinc oxide is removed, and the rest is the same as Example 1, and the specific steps are as follows: Step 1: Add nano zinc oxide and polyvinyl pyrrolidone to deionized water, stir and react at 30°C for 30 hours, and after the reaction is completed, wash and dry to obtain modified zinc oxide 2; dissolve cobalt nitrate hexahydrate in methanol to obtain cobalt nitrate hexahydrate solution; dissolve 2-methylimidazole in methanol to obtain 2-methylimidazole solution; add modified zinc oxide 2 to methanol, ultrasonically disperse for 15 minutes, and then add cobalt nitrate hexahydrate. The solution was stirred for 40 minutes, and 2-methylimidazole solution was added after the stirring was completed, and the reaction was allowed to stand for 30 hours. After the reaction was completed, the ZnO-MOF material was obtained by suction filtration, washing, drying and grinding; nickel nitrate hexahydrate was dissolved in ethanol to obtain a nickel nitrate hexahydrate solution; the ZnO-MOF material was added to ethanol, ultrasonically dispersed for 15 minutes, and the nickel nitrate hexahydrate solution was added. After stirring evenly, the nickel nitrate hexahydrate solution was hydrothermally reacted at 95°C for 3 hours. After the reaction was completed, the ZnO-LDH material was obtained by centrifugation, washing, drying and grinding. Add γ-glycidyloxypropyltrimethoxysilane to the mixed solvent, disperse it evenly by ultrasonication, and obtain silane coupling agent solution 2; under a nitrogen atmosphere, add the ZnO-LDH material to anhydrous ethanol, disperse it evenly by ultrasonication, and then heat it to 70°C, then drop the silane coupling agent solution 2 and adjust the pH to 3.5, react for 10 hours, and after the reaction is completed, filter, wash, and vacuum dry to obtain a modified ZnO-LDH material; under a nitrogen atmosphere, heat 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide at 140°C until it is melted, then add the modified ZnO-LDH material and triphenylphosphine, stir and react at 140°C for 12 hours, and after the reaction is completed, dry to obtain a flame-retardant modified ZnO-LDH material; The mixed solvent is composed of anhydrous ethanol and water in a volume ratio of 10:1; when preparing modified zinc oxide 2, the reaction mass ratio of nano zinc oxide and polyvinyl pyrrolidone is 1.1:4; when preparing ZnO-MOF material, the reaction mass ratio of modified zinc oxide 2, cobalt nitrate hexahydrate, and 2-methylimidazole is 1:10:12.7; when preparing ZnO-LDH material, the reaction mass ratio of ZnO-MOF material and nickel nitrate hexahydrate is 1:4.9; when preparing modified ZnO-LDH material, the reaction mass ratio of ZnO-LDH material and γ-glycidyloxypropyltrimethoxysilane is 13:1; when preparing flame-retardant modified ZnO-LDH material, the reaction mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and modified ZnO-LDH material is 1:14; Step 2: 30g of chloroprene rubber, 20g of ethylene propylene rubber, 5g of flame retardant modified ZnO-LDH material, 3g of sulfur as a vulcanizing agent, 4g of dioctyl phthalate, 0.4g of 2,6-di-tert-butyl-4-methylphenol and 5g of mica powder were mixed and kneaded at 160°C for 50min to obtain a cable protective sheath; Dopamine is dissolved in deionized water, and tris(hydroxymethylaminomethane) and tris(hydroxymethylaminomethane) hydrochloride are added to obtain a dopamine buffer solution with a pH value of 8.7; the cable protective sheath is immersed in the dopamine buffer solution for 15 hours to obtain a polydopamine layer; phytic acid is added dropwise to the aniline solution, and then an aqueous ammonium persulfate solution is added to obtain an aniline reaction solution; the cable protective sheath is further immersed in the aniline reaction solution, and stirred at 5°C for 15 hours to obtain a phosphorus-doped polyaniline layer, and finally a high-efficiency flame-retardant cable protective sheath 5 is obtained; the mica tape 1 is tightly wrapped around the surface of the copper conductor 2 in a spiral shape, and then an inorganic mineral filling material 6 is filled into the gap around the copper conductor 2 wrapped with the mica tape 1; a cable core is obtained; the inorganic tape 3, the embossed copper sheath 4, and the high-efficiency flame-retardant cable protective sheath 5 are sequentially wrapped on the cable core to obtain a finished product; When preparing the polydopamine layer, the mass volume ratio of dopamine and deionized water is 0.004g:2mL; when preparing the phosphorus-doped polyaniline layer, the concentration of phytic acid in the aniline reaction solution is 0.15mol / L, the concentration of aniline is 0.45mol / L, and the concentration of ammonium persulfate is 0.62mol / L.

[0026] Comparative Example 2: The flame-retardant modified ZnO-LDH material is removed, and the rest is the same as Example 1, and the specific steps are as follows: Step 1: Add γ-aminopropyltriethoxysilane to the mixed solvent, and ultrasonically disperse it uniformly to obtain a silane coupling agent solution 1; add nano zinc oxide to anhydrous ethanol, ultrasonically disperse it uniformly, and then heat it to 80°C, and then drop the silane coupling agent solution 1 to continue the reaction for 5 hours. After the reaction is completed, centrifuge, wash, and vacuum dry to obtain modified zinc oxide 1; add the modified zinc oxide 1 to N,N-dimethylformamide, and ultrasonically disperse it uniformly to obtain a modified zinc oxide solution; uniformly disperse cyanuric chloride in N,N-dimethylformamide to obtain a cyanuric chloride solution; drop the cyanuric chloride solution into the modified zinc oxide solution, and then add triethylamine, stir and react at 95°C for 15 hours to obtain a flame-retardant modified zinc oxide; The mixed solvent is composed of anhydrous ethanol and water, with a volume ratio of 10:1; the reaction mass ratio of nano zinc oxide, γ-aminopropyltriethoxysilane and cyanuric chloride is 10:1:2.5; Step 2: 30g of chloroprene rubber, 20g of ethylene propylene rubber, 3g of flame retardant modified zinc oxide, 3g of vulcanizing agent sulfur, 4g of dioctyl phthalate, 0.4g of 2,6-di-tert-butyl-4-methylphenol and 5g of mica powder were mixed and kneaded at 160°C for 50min to obtain a cable protective cover; Dopamine is dissolved in deionized water, and tris(hydroxymethylaminomethane) and tris(hydroxymethylaminomethane) hydrochloride are added to obtain a dopamine buffer solution with a pH value of 8.7; the cable protective sheath is immersed in the dopamine buffer solution for 15 hours to obtain a polydopamine layer; phytic acid is added dropwise to the aniline solution, and then an aqueous ammonium persulfate solution is added to obtain an aniline reaction solution; the cable protective sheath is further immersed in the aniline reaction solution, and stirred at 5°C for 15 hours to obtain a phosphorus-doped polyaniline layer, and finally a high-efficiency flame-retardant cable protective sheath 5 is obtained; the mica tape 1 is tightly wrapped around the surface of the copper conductor 2 in a spiral shape, and then an inorganic mineral filling material 6 is filled into the gap around the copper conductor 2 wrapped with the mica tape 1; a cable core is obtained; the inorganic tape 3, the embossed copper sheath 4, and the high-efficiency flame-retardant cable protective sheath 5 are sequentially wrapped on the cable core to obtain a finished product; When preparing the polydopamine layer, the mass volume ratio of dopamine and deionized water is 0.004g:2mL; when preparing the phosphorus-doped polyaniline layer, the concentration of phytic acid in the aniline reaction solution is 0.15mol / L, the concentration of aniline is 0.45mol / L, and the concentration of ammonium persulfate is 0.62mol / L.

[0027] Comparative Example 3: The flame retardant modified zinc oxide and the flame retardant modified ZnO-LDH material are removed, and the rest is the same as Example 1, and the specific steps are as follows: Step 1: 30g of chloroprene rubber, 20g of ethylene propylene rubber, 3g of vulcanizing agent sulfur, 4g of dioctyl phthalate, 0.4g of 2,6-di-tert-butyl-4-methylphenol and 5g of mica powder are mixed, and kneaded at 160°C for 50min to obtain a cable protective cover; Dopamine is dissolved in deionized water, and tris(hydroxymethylaminomethane) and tris(hydroxymethylaminomethane) hydrochloride are added to obtain a dopamine buffer solution with a pH value of 8.7; the cable protective sheath is immersed in the dopamine buffer solution for 15 hours to obtain a polydopamine layer; phytic acid is added dropwise to the aniline solution, and then an aqueous ammonium persulfate solution is added to obtain an aniline reaction solution; the cable protective sheath is further immersed in the aniline reaction solution, and stirred at 5°C for 15 hours to obtain a phosphorus-doped polyaniline layer, and finally a high-efficiency flame-retardant cable protective sheath 5 is obtained; the mica tape 1 is tightly wrapped around the surface of the copper conductor 2 in a spiral shape, and then an inorganic mineral filling material 6 is filled into the gap around the copper conductor 2 wrapped with the mica tape 1; a cable core is obtained; the inorganic tape 3, the embossed copper sheath 4, and the high-efficiency flame-retardant cable protective sheath 5 are sequentially wrapped on the cable core to obtain a finished product; When preparing the polydopamine layer, the mass volume ratio of dopamine and deionized water is 0.004g:2mL; when preparing the phosphorus-doped polyaniline layer, the concentration of phytic acid in the aniline reaction solution is 0.15mol / L, the concentration of aniline is 0.45mol / L, and the concentration of ammonium persulfate is 0.62mol / L.

[0028] Comparative Example 4: The preparation of the polydopamine layer and the phosphorus-doped polyaniline layer is removed, and the rest is the same as Example 1, and the specific steps are as follows: Step 1: Add γ-aminopropyltriethoxysilane to the mixed solvent, and ultrasonically disperse it uniformly to obtain a silane coupling agent solution 1; add nano zinc oxide to anhydrous ethanol, ultrasonically disperse it uniformly, and then heat it to 80°C, and then drop the silane coupling agent solution 1 to continue the reaction for 5 hours. After the reaction is completed, centrifuge, wash, and vacuum dry to obtain modified zinc oxide 1; add the modified zinc oxide 1 to N,N-dimethylformamide, and ultrasonically disperse it uniformly to obtain a modified zinc oxide solution; uniformly disperse cyanuric chloride in N,N-dimethylformamide to obtain a cyanuric chloride solution; drop the cyanuric chloride solution into the modified zinc oxide solution, and then add triethylamine, and stir the reaction at 95°C for 15 hours to obtain a flame-retardant modified zinc oxide; The mixed solvent is composed of anhydrous ethanol and water, with a volume ratio of 10:1; the reaction mass ratio of nano zinc oxide, γ-aminopropyltriethoxysilane and cyanuric chloride is 10:1:2.5; Step 2: Add nano zinc oxide and polyvinyl pyrrolidone to deionized water, stir and react at 30°C for 30 hours, wash and dry after the reaction to obtain modified zinc oxide 2; dissolve cobalt nitrate hexahydrate in methanol to obtain cobalt nitrate hexahydrate solution; dissolve 2-methylimidazole in methanol to obtain 2-methylimidazole solution; add modified zinc oxide 2 to methanol, ultrasonically disperse for 15 minutes, add cobalt nitrate hexahydrate solution and stir for 40 minutes, add 2-methylimidazole solution after stirring, let stand for reaction for 30 hours, filter, wash, dry and grind after the reaction to obtain ZnO-MOF material; dissolve nickel nitrate hexahydrate in ethanol to obtain nickel nitrate hexahydrate solution; add ZnO-MOF material to ethanol, ultrasonically disperse for 15 minutes, add nickel nitrate hexahydrate solution, stir evenly and hydrothermally react at 95°C for 3 hours, centrifuge, wash, dry and grind after the reaction to obtain ZnO-LDH material; Add γ-glycidyloxypropyltrimethoxysilane to the mixed solvent, disperse it evenly by ultrasonication, and obtain silane coupling agent solution 2; under a nitrogen atmosphere, add the ZnO-LDH material to anhydrous ethanol, disperse it evenly by ultrasonication, and then heat it to 70°C, then drop the silane coupling agent solution 2 and adjust the pH to 3.5, react for 10 hours, and after the reaction is completed, filter, wash, and vacuum dry to obtain a modified ZnO-LDH material; under a nitrogen atmosphere, heat 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide at 140°C until it is melted, then add the modified ZnO-LDH material and triphenylphosphine, stir and react at 140°C for 12 hours, and after the reaction is completed, dry to obtain a flame-retardant modified ZnO-LDH material; The mixed solvent is composed of anhydrous ethanol and water in a volume ratio of 10:1; when preparing modified zinc oxide 2, the reaction mass ratio of nano zinc oxide and polyvinyl pyrrolidone is 1.1:4; when preparing ZnO-MOF material, the reaction mass ratio of modified zinc oxide 2, cobalt nitrate hexahydrate, and 2-methylimidazole is 1:10:12.7; when preparing ZnO-LDH material, the reaction mass ratio of ZnO-MOF material and nickel nitrate hexahydrate is 1:4.9; when preparing modified ZnO-LDH material, the reaction mass ratio of ZnO-LDH material and γ-glycidyloxypropyltrimethoxysilane is 13:1; when preparing flame-retardant modified ZnO-LDH material, the reaction mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and modified ZnO-LDH material is 1:14; Step three: Mix 30g chloroprene rubber, 20g EPDM rubber, 3g flame retardant modified zinc oxide, 5g flame retardant modified ZnO-LDH material, 3g vulcanizing agent sulfur, 4g dioctyl phthalate, 0.4g 2,6-di-tert-butyl-4-methylphenol and 5g mica powder, and knead them at 160°C for 50min to obtain a cable protective sheath; wrap the mica tape 1 tightly around the surface of the copper conductor 2 in a spiral shape, and then fill the inorganic mineral filling material 6 into the gap around the copper conductor 2 wrapped with the mica tape 1; obtain a cable core; wrap the inorganic tape 3, the embossed copper sheath 4, and the high-efficiency flame retardant cable protective sheath 5 on the cable core in sequence to obtain a finished product.

[0029] Limiting oxygen index test: The high-efficiency flame-retardant cable protective sheath / cable protective sheath prepared by the present invention is used as a sample, and the oxygen index value is recorded in accordance with GB / T2406-1993 standard.

[0030] Vertical burning test: The high-efficiency flame-retardant cable protective sheath / cable protective sheath prepared by the present invention is used as a sample, and the vertical burning test grade is determined by referring to the UL-94 vertical burning test.

[0031] UV aging resistance test: The high-efficiency flame-retardant cable protective sheath / cable protective sheath prepared by the present invention is used as a sample, and an accelerated aging test is performed using a UV lamp weather resistance test box with reference to GB / T 16585-1996, with an irradiation wavelength of 310nm, an illumination temperature of 40°C, and an aging cycle of 50h. After the test, the sample is taken out and the tensile strength is tested using an electronic tensile machine, with a tensile rate of 500mm / min and a sample size of 100mm×20mm×4mm. The tensile strength maintenance rate is substituted into the formula = 50h tensile strength / 0h tensile strength. The results are as follows:

[0032] Conclusion: The dosage of Examples 1 to 3 remains unchanged, and only some reaction parameters are modified. From the experimental data, it can be seen that the various properties of the samples have no obvious fluctuations.

[0033] Comparative Example 1: The flame-retardant modified zinc oxide is removed, and the rest is the same as Example 1. It can be seen from the experimental data that compared with Example 1, the limiting oxygen index is reduced to 27%, the combustion grade is changed to V-1, and the tensile strength maintenance rate is reduced to 78.5%. The reason is analyzed as follows: the flame-retardant modified zinc oxide contains nano zinc oxide with good anti-ultraviolet aging performance and a triazine ring structure with good flame retardant properties. Therefore, after removing it, the limiting oxygen index is reduced, the combustion grade is changed to V-1, and the tensile strength maintenance rate is reduced.

[0034] Comparative Example 2: The flame retardant modified ZnO-LDH material is removed, and the rest is the same as Example 1. It can be seen from the experimental data that, compared with Example 1, the limiting oxygen index is reduced to 24%, the combustion level is changed to V-1, and the tensile strength retention rate is reduced to 73.3%. The reason is analyzed as follows: the flame retardant modified ZnO-LDH material contains nano zinc oxide and hydrotalcite with the advantage of anti-ultraviolet aging, and also has 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with excellent flame retardant properties. Therefore, after removing it, the limiting oxygen index is reduced, the combustion level is changed to V-1, and the tensile strength retention rate is reduced.

[0035] Comparative Example 3: The flame retardant modified zinc oxide and the flame retardant modified ZnO-LDH material are removed, and the rest is the same as Example 1. It can be seen from the experimental data that compared with Example 1, the limiting oxygen index is reduced to 21%, the combustion level is changed to V-1, and the tensile strength retention rate is reduced to 68.1%. The reason is analyzed as follows: From the data and analysis of Comparative Examples 1 and 2, it can be seen that the flame retardant modified zinc oxide and the flame retardant modified ZnO-LDH materials have a significant effect on the flame retardant properties and anti-ultraviolet aging properties, so after removing them, the limiting oxygen index is reduced, the combustion level is changed to V-1, and the tensile strength retention rate is reduced.

[0036] Comparative Example 4: The preparation of the polydopamine layer and the phosphorus-doped polyaniline layer was removed, and the rest was the same as in Example 1. It can be seen from the experimental data that compared with Example 1, the limiting oxygen index was reduced by 26%, and the combustion grade became V-1. The reason for this is that the polydopamine layer and the phosphorus-doped polyaniline layer contain a large amount of flame retardant elements N and P, so they have good flame retardant properties. Therefore, after removing them, the limiting oxygen index was reduced and the combustion grade became V-1.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process method article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process method article or device.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A processing technology for high temperature resistant and ultraviolet resistant flexible fireproof cable, characterized in that: The following steps are involved: Step 1: Adding nano zinc oxide and γ-aminopropyltriethoxysilane as main raw materials to obtain a modified zinc oxide solution; Uniformly dispersing cyanuric chloride in N,N-dimethylformamide to obtain a cyanuric chloride solution; dropping the cyanuric chloride solution into the modified zinc oxide solution, then adding triethylamine, stirring and reacting at 90-95° C. for 12-15 hours to obtain a flame-retardant modified zinc oxide; Step 2: Add nano zinc oxide, polyvinyl pyrrolidone, hexahydrate cobalt nitrate solution, 2-methylimidazole solution, hexahydrate nickel nitrate solution, and γ-glycidyloxypropyltrimethoxysilane as main raw materials to obtain a modified ZnO-LDH material; in a nitrogen atmosphere, heat 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide at 130-140° C. until it is melted, then add the modified ZnO-LDH material and triphenylphosphine, stir and react at 130-140° C. for 10-12 hours, and dry after the reaction to obtain a flame-retardant modified ZnO-LDH material; Step 3: Mix chloroprene rubber, ethylene propylene rubber, flame retardant modified zinc oxide, flame retardant modified ZnO-LDH material, vulcanizer, plasticizer, antioxidant and mica powder, and knead at 140-160° C. for 35-50 minutes to obtain a cable protective cover; Then, a polydopamine layer and a phosphorus-doped polyaniline layer are sequentially prepared on the surface of the cable protective sheath to obtain a high-efficiency flame-retardant cable protective sheath (5); a mica tape (1) is tightly wrapped around the surface of a copper conductor (2) in a spiral shape, and an inorganic mineral filling material (6) is then filled into the gap around the copper conductor (2) wrapped with the mica tape (1); a cable core is obtained; and an inorganic tape (3), an embossed copper sheath (4), and a high-efficiency flame-retardant cable protective sheath (5) are sequentially wrapped around the cable core to obtain a finished product.

2. The processing technology of a high temperature resistant and ultraviolet resistant flexible fireproof cable according to claim 1 is characterized in that: In step 1, the specific preparation process of the modified zinc oxide solution is as follows: γ-aminopropyltriethoxysilane is added to a mixed solvent, and ultrasonically dispersed to obtain a silane coupling agent solution 1; nano zinc oxide is added to anhydrous ethanol, and ultrasonically dispersed to obtain a silane coupling agent solution 1, and then the temperature is raised to 75-80° C., and then the silane coupling agent solution 1 is added dropwise to continue the reaction for 4-5 hours. After the reaction is completed, the modified zinc oxide 1 is obtained by centrifugation, washing, and vacuum drying. The modified zinc oxide 1 was added into N,N-dimethylformamide and dispersed uniformly by ultrasonication to obtain a modified zinc oxide solution.

3. The processing technology of a high temperature resistant and ultraviolet resistant flexible fireproof cable according to claim 2 is characterized in that: The mixed solvent consists of anhydrous ethanol and water in a volume ratio of (10-12):1; the reaction mass ratio of nano zinc oxide, gamma-aminopropyl triethoxysilane and cyanuric chloride is 10:1:(2-3).

4. The processing technology of a high temperature resistant and ultraviolet resistant flexible fireproof cable according to claim 1 is characterized in that: In step 2, when preparing the flame retardant modified ZnO-LDH material, the reaction mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and the modified ZnO-LDH material is 1:(13-15).

5. The processing technology of a high temperature resistant and ultraviolet resistant flexible fireproof cable according to claim 4 is characterized in that: The specific preparation process of the modified ZnO-LDH material is as follows: adding nano zinc oxide and polyvinyl pyrrolidone to deionized water, stirring and reacting at 25-30°C for 25-30 hours, washing and drying after the reaction to obtain modified zinc oxide 2; dissolving cobalt nitrate hexahydrate in methanol to obtain cobalt nitrate hexahydrate solution; dissolving 2-methylimidazole in methanol to obtain 2-methylimidazole solution; adding modified zinc oxide 2 to methanol, ultrasonically dispersing for 10-15 minutes, adding cobalt nitrate hexahydrate solution and stirring for 30-40 minutes, adding 2-methylimidazole solution after stirring, standing for reaction for 25-30 hours, filtering, washing, drying and grinding after the reaction to obtain ZnO-MOF material; Dissolve nickel nitrate hexahydrate in ethanol to obtain a nickel nitrate hexahydrate solution; add the ZnO-MOF material to the ethanol, ultrasonically disperse for 10-15 minutes, then add the nickel nitrate hexahydrate solution, stir evenly, and then hydrothermally react at 90-95° C. for 2-3 hours. After the reaction is completed, centrifuge, wash, dry, and grind to obtain a ZnO-LDH material; Under a nitrogen atmosphere, the ZnO-LDH material was added to anhydrous ethanol, and the temperature was raised to 60-70°C after ultrasonic dispersion. Then, the silane coupling agent solution 2 was added dropwise and the pH was adjusted to 3.0-3.

5. The reaction was carried out for 8-10 hours. After the reaction was completed, the modified ZnO-LDH material was obtained by filtration, washing and vacuum drying.

6. The processing technology of a high temperature resistant and ultraviolet resistant flexible fireproof cable according to claim 5 is characterized in that: When preparing modified zinc oxide 2, the reaction mass ratio of nano zinc oxide and polyvinyl pyrrolidone is (1-1.2):4; when preparing ZnO-MOF material, the reaction mass ratio of modified zinc oxide 2, cobalt nitrate hexahydrate, and 2-methylimidazole is 1:10:(12.5-13.0); when preparing ZnO-LDH material, the reaction mass ratio of ZnO-MOF material and nickel nitrate hexahydrate is 1:(4.8-5.0); when preparing modified ZnO-LDH material, the reaction mass ratio of ZnO-LDH material and γ-glycidyloxypropyltrimethoxysilane is (12-14):1; γ-glycidyloxypropyltrimethoxysilane is added to a mixed solvent and uniformly dispersed by ultrasonication to obtain a silane coupling agent solution 2; the mixed solvent consists of anhydrous ethanol and water in a volume ratio of (10-12):

1.

7. The processing technology of a high temperature resistant and ultraviolet resistant flexible fireproof cable according to claim 1 is characterized in that: In step three, the contents of each component of the cable protective sheath are: by mass, 30-40 parts of chloroprene rubber, 20-30 parts of ethylene-propylene rubber, 3-8 parts of flame-retardant modified zinc oxide, 4-10 parts of flame-retardant modified ZnO-LDH material, 3-5 parts of vulcanizing agent, 4-7 parts of plasticizer, 0.4-1.2 parts of antioxidant, 5-10 parts of mica powder; the vulcanizing agent is sulfur; the plasticizer is dioctyl phthalate; the antioxidant is 2,6-di-tert-butyl-4-methylphenol.

8. The processing technology of a high temperature resistant and ultraviolet resistant flexible fireproof cable according to claim 1 is characterized in that: In step 3, the specific preparation process of the high-efficiency flame-retardant cable protective sheath (5) is as follows: dopamine is dissolved in deionized water, and then tris(hydroxymethyl)aminomethane and tris(hydroxymethyl)aminomethane hydrochloride) are added to obtain a dopamine buffer solution with a pH value of 8.5-8.7; The cable protective sheath is immersed in a dopamine buffer solution for 10-15 hours to obtain a polydopamine layer; phytic acid is added dropwise to the aniline solution, and then an ammonium persulfate aqueous solution is added to obtain an aniline reaction solution; the cable protective sheath is further immersed in the aniline reaction solution, stirred and reacted at 0-5°C for 12-15 hours to obtain a phosphorus-doped polyaniline layer, and finally a high-efficiency flame-retardant cable protective sheath (5) is obtained.

9. The processing technology of a high temperature resistant and ultraviolet resistant flexible fireproof cable according to claim 8, characterized in that: When preparing the polydopamine layer, the mass volume ratio of dopamine and deionized water is (0.004-0.005) g: 2 mL; when preparing the phosphorus-doped polyaniline layer, the concentration of phytic acid in the aniline reaction solution is 0.15-0.17 mol / L, the concentration of aniline is 0.45-0.50 mol / L, and the concentration of ammonium persulfate is 0.62-0.65 mol / L.

10. The processing technology of a high temperature resistant and ultraviolet resistant flexible fireproof cable according to claim 1, characterized in that: In step 3, the copper conductor (2) and the embossed copper sheath (4) are both made of red copper.

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