Flame-retardant corrosion-resistant power cable and preparation method thereof

Abstract

The invention discloses a flame-retardant corrosion-resistant power cable and a preparation method thereof, and relates to the field of flame-retardant cables. The preparation method comprises the following steps: firstly, polymerizing o-chlorocinnamaldehyde and tea polyphenol under an alkaline condition to form novel phenolic resin, further compounding the generated phenolic resin with nano aluminum oxide to obtain a self-made corrosion inhibitor, finally adding the self-made corrosion inhibitor into a base material of a cable protection sleeve, and reacting under the action of an initiator to generate a cable base material with flame-retardant effects. The preparation method comprises the following steps: firstly, modifying activated clay by using dithiothreitol, then carrying out ultraviolet curing click reaction on sulfydryl and tetraallyloxyethane to obtain organic modified activated clay, and finally, spraying the organic modified activated clay onto the surface of a cable base material to form a coating with high corrosion resistance, thereby finally obtaining the flame-retardant and corrosion-resistant power cable. According to the flame-retardant and corrosion-resistant power cable prepared by the invention, the corrosion resistance of the cable is effectively enhanced on the basis of realizing efficient flame retardance.

Description

Technical Field

[0001] The invention relates to the technical field of flame-retardant cables, in particular to a flame-retardant and corrosion-resistant power cable and a preparation method thereof. Background Art

[0002] With the advancement of science and technology and the rapid development of the power industry, power cables, as a key tool for transmitting electric energy, are also subject to increasing performance requirements. There are three main challenges. On the one hand, short circuits may cause fires during the use of the cables themselves. Cable materials need to be able to slow down the spread of fire when a fire occurs, so as to buy precious time for personnel evacuation and rescue. On the other hand, when the cables are attacked by fire during normal operation, the materials used in the cables need to have a high flame retardant effect to protect the core material from damage by external fires, maintain the integrity of the circuit, and ensure the safe and stable operation of the power system. Finally, the external environment will have a certain impact on the cables. Power cables are often laid in various complex environments, including humid, acidic and alkaline corrosive environments. This requires the materials used to be resistant to electrochemical corrosion, biological erosion, chemical (oil, acid, alkali, chemical solvents, etc.) erosion, and salt spray, to ensure that the cables can operate stably and for a long time in these environments and extend the service life of the cables. Therefore, it is urgent to develop cables with high flame retardancy and high corrosion resistance. Summary of the invention

[0003] The object of the present invention is to provide a flame retardant and corrosion resistant power cable and a preparation method thereof, so as to solve the problems existing in the prior art.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a flame retardant and corrosion resistant power cable, wherein the protective sheath of the flame retardant and corrosion resistant power cable is prepared by first mixing ethylene propylene rubber, hydrogenated butyl rubber, hydroxy silicone oil, a homemade anticorrosive agent, an initiator, and a cross-linking agent, kneading the mixture through a screw extruder, and then drawing and cooling the sheet to obtain a cable protective sheath substrate, and then spraying modified activated clay onto the surface of the cable protective sheath substrate to obtain the coating after curing.

[0005] Furthermore, the self-made antiseptic is prepared by polymerizing o-chlorocinnamaldehyde and tea polyphenols to form a phenolic resin, which is further compounded with nano-alumina.

[0006] Furthermore, the modified activated clay is prepared by organically modifying the activated clay with dithiothreitol in advance and then reacting the activated clay with tetraallyloxyethane through a photocuring click reaction.

[0007] Furthermore, the Mooney viscosity of the EPDM rubber is 30-80, the Mooney viscosity of the hydrogenated butyl rubber is 50-150, and the viscosity of the hydroxy silicone oil is 500-1000CS.

[0008] Furthermore, the initiator is one or more of dicumyl peroxide, dibenzoyl peroxide, di-tert-butyl peroxide, and an organic tin compound, and the crosslinking agent is vinyl triaminomethoxysilane.

[0009] Furthermore, a method for preparing a flame retardant and corrosion resistant power cable comprises the following preparation steps:

[0010] (1) Dissolve 10 to 30 parts of tea polyphenols in 50 to 80 parts of anhydrous ethanol, add 30 to 50 parts of a 50% by mass aqueous solution of NaOH, and mix to obtain solution A; Dissolve 10 to 30 parts of o-chlorocinnamaldehyde in 80 to 100 parts of anhydrous ethanol, and mix to obtain solution B; Add solution B to solution A at a rate of 0.5 to 2 drops / s while stirring at 50 to 80° C. and 200 to 400 r / min. Reflux and keep warm for 1 to 3 hours, then raise the temperature to 90 to 120°C within 20 to 40 minutes, keep warm for 1 to 2 hours, add 10 to 20 parts of aluminum oxide with a particle size of 50 to 100 nm, stir at 80 to 100°C and 300 to 600 r / min for 1 to 3 hours, then connect a vacuum pump and reduce the pressure to 0.01 to 0.09 MPa at 90 to 100°C and distill for 2 to 6 hours to remove the solvent, and obtain a homemade anticorrosive agent after completion;

[0011] (2) Mix ethylene propylene rubber, hydrogenated butyl rubber, hydroxy silicone oil, homemade anticorrosive agent, initiator and crosslinking agent in a screw extruder, melt extrude on the surface of the cable core at 250-300° C., the protective cover has a thickness of 0.06-0.10 mm, transfer to a drying oven, dry at 50-90° C. for 3-6 hours, and obtain a prefabricated cable;

[0012] (3) dissolving dithiothreitol in anhydrous ethanol, stirring at 200-400 r / min for 20-40 min under nitrogen atmosphere, adding activated clay with a particle size of 0.30-0.80 mm to the solution, continuing stirring for 20-40 min, transferring to a reactor, reacting at 60-100° C. for 3-6 h, cooling naturally, and then adding tetraallyloxyethane, stirring at 200-400 r / min for 12-24 h at 30-50° C., centrifuging at 8000-12000 rpm for 20-40 min to obtain a solid sample, and repeatedly washing with deionized water for 4-8 times to obtain modified activated clay;

[0013] (4) taking the modified activated clay and placing it in anhydrous ethanol, ultrasonically dispersing it at a frequency of 100 to 300 kHz for 20 to 40 minutes to obtain a solution C, and continuing to stir at a speed of 500 to 1000 r / min at room temperature for 5 to 8 hours, using an ultrasonic spray gun to evenly spray the solution C onto the surface of the prefabricated cable prepared in step (2), and after spraying, placing it in an oven for drying to obtain a flame-retardant and corrosion-resistant power cable.

[0014] Furthermore, in step (2), the cable base material comprises, by weight, 40 to 60 parts of ethylene propylene rubber, 30 to 50 parts of hydrogenated butyl rubber, 20 to 40 parts of hydroxy silicone oil, 5 to 10 parts of a homemade anticorrosive agent, 1 to 5 parts of an initiator, and 1 to 5 parts of a crosslinking agent.

[0015] Furthermore, in step (3), the modified activated clay contains, by weight, 20 to 40 parts of dithiothreitol, 80 to 100 parts of anhydrous ethanol, 10 to 20 parts of activated clay, and 20 to 40 parts of tetraallyloxyethane.

[0016] Furthermore, in step (4), the flame retardant and corrosion resistant power cable comprises, by weight, 20 to 40 parts of modified activated clay, 100 to 200 parts of anhydrous ethanol, and 1000 to 1500 parts of prefabricated cable.

[0017] Furthermore, in step (4), the oven drying temperature is 60 to 80° C. and the drying time is 24 to 48 hours.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] The flame-retardant and corrosion-resistant power cable prepared by the present invention effectively enhances the corrosion resistance of the cable on the basis of achieving high-efficiency flame retardancy.

[0020] First, o-chlorocinnamaldehyde and tea polyphenols are polymerized under alkaline conditions to form a new type of phenolic resin, and various special functional groups such as carbon-carbon double bonds and chlorine are introduced into the resin to effectively block the damage of various corrosive media in the use conditions and improve the anti-corrosion effect of the cable. The generated phenolic resin is further compounded with nano-alumina to obtain a homemade anti-corrosion agent, which is finally added to the base material of the cable protective sheath. Under the action of an initiator, the addition between carbon-carbon double bonds and the cross-linking between unreacted phenolic hydroxyl groups are achieved to form an efficient anti-corrosion three-dimensional network. When the cable generates heat due to a short circuit, the resin component in the organic-inorganic composite anti-corrosion agent decomposes due to heat to form a carbonized layer, which blocks the oxygen in the air from entering the cable. The alumina in the structure will also form a dense inorganic film after being heated, which synergizes with the carbonized layer to effectively block the invasion of external oxygen and enhance the anti-flame retardant effect of the cable.

[0021] Secondly, dithiothreitol is used to modify the activated clay to improve its thermal stability, so that it can still maintain adsorption activity at high temperatures and improve the corrosion resistance of the cable. Then, the organic modified activated clay is obtained by thermal curing click reaction between thiol and tetraallyloxyethane, and the remaining unreacted carbon-carbon double bonds are distributed between the layers and on the surface, which optimizes the internal electron distribution and enhances the reaction activity of the activated clay to free radicals and free electrons, effectively reducing the damage of free radicals and free electrons to the cable substrate and extending the service life of the cable. At the same time, when heated, the double bonds are further added to each other in pairs, so that a complex cross-linked network is formed on the cable surface to form a shielding layer, which slows down the diffusion rate of external heat in the wire and improves the flame retardant properties of the cable. Finally, it is sprayed onto the surface of the cable substrate and firmly adhered to the cable surface by means of adhesives and hydrogen bonds, which can effectively fill the tiny pores and cracks on the cable surface, reduce moisture and air penetration, and improve the insulation performance and safety of the cable. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of 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 making creative work are within the scope of protection of the present invention.

[0023] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe the method in detail. The test methods of various indicators of Examples 1-3 and Comparative Examples 1-5 prepared in the following examples are as follows:

[0024] Cable related performance: The corrosion resistance of Examples 1-3 and Comparative Examples 1-5 was tested according to the test method specified in GB / T 2951.11-2008;

[0025] Oxygen index: The flame retardant properties of Examples 1-3 and Comparative Examples 1-5 were tested according to the test method specified in GB / T 2406-1993.

[0026] Example 1

[0027] (1) 10 parts of tea polyphenols are dissolved in 50 parts of anhydrous ethanol, 30 parts of a 50% NaOH aqueous solution are added, and the mixture is mixed to obtain a solution A; 10 parts of o-chlorocinnamaldehyde are dissolved in 80 parts of anhydrous ethanol, and the mixture is mixed to obtain a solution B; solution B is added to solution A at a rate of 1.5 drops / s while stirring at 70°C and 300 r / min, and the mixture is refluxed and kept warm for 3 hours, then the temperature is raised to 100°C within 30 minutes, kept warm for 2 hours, 10 to 20 parts of alumina with a particle size of 80 nm are added, and the mixture is stirred at 90°C and 500 r / min for 3 hours, and then a vacuum pump is connected to the mixture and the solvent is removed by distillation at 95°C with a reduced pressure of 0.07 MPa for 4 hours, and a self-made antiseptic is obtained after the mixture is finished;

[0028] (2) 40 parts of ethylene propylene rubber, 30 parts of hydrogenated butyl rubber, 20 parts of hydroxy silicone oil, 5 parts of homemade anticorrosive agent, 1 part of di-tert-butyl peroxide, and 1 part of vinyl triaminomethoxysilane were mixed and placed in a screw extruder, melt-extruded on the surface of the cable core at 270°C, and the thickness of the protective cover was 0.09 mm. The mixture was transferred to a drying oven and dried at 80°C for 5 hours to obtain a prefabricated cable;

[0029] (3) Take 20 parts of dithiothreitol and dissolve it in 80 parts of anhydrous ethanol. Stir at 300 r / min for 30 min under nitrogen atmosphere. Add 10 parts of activated clay with a particle size of 0.70 mm to the solution. Continue stirring for 40 min. Transfer to a reactor and react at 80° C. for 5 h. Cool naturally. Continue to add 20 parts of tetraallyloxyethane. Stir at 300 r / min for 18 h at 40° C. Centrifuge at 10000 rpm for 30 min to obtain a solid sample. Wash repeatedly with deionized water 5 times to obtain modified activated clay.

[0030] (4) 20 parts of modified activated clay were placed in 100 parts of anhydrous ethanol, and ultrasonically dispersed at a frequency of 200 kHz for 30 minutes to obtain a solution C. The solution was stirred at a speed of 800 r / min at room temperature for 6 hours, and the solution C was evenly sprayed onto the surface of 1000 parts of the prefabricated cable prepared in step (2) using an ultrasonic spray gun. After spraying, the solution was placed in an oven for drying to obtain a flame-retardant and corrosion-resistant power cable.

[0031] Example 2

[0032] (1) 20 parts of tea polyphenols are dissolved in 65 parts of anhydrous ethanol, 40 parts of a 50% NaOH aqueous solution are added, and the mixture is mixed to obtain a solution A; 20 parts of o-chlorocinnamaldehyde are dissolved in 90 parts of anhydrous ethanol, and the mixture is mixed to obtain a solution B; solution B is added to solution A at a rate of 1.5 drops / s while stirring at 70°C and 300 r / min, and the mixture is refluxed and kept warm for 3 hours, then the temperature is raised to 100°C within 30 minutes, kept warm for 2 hours, 15 parts of alumina with a particle size of 80 nm are added, and the mixture is stirred at 90°C and 500 r / min for 3 hours, and then a vacuum pump is connected to the mixture and the solvent is removed by distillation at 95°C with a reduced pressure of 0.07 MPa for 4 hours, and a self-made antiseptic is obtained after the mixture is finished;

[0033] (2) 50 parts of ethylene propylene rubber, 40 parts of hydrogenated butyl rubber, 30 parts of hydroxy silicone oil, 8 parts of homemade anticorrosive agent, 3 parts of di-tert-butyl peroxide, and 3 parts of vinyl triaminomethoxysilane were mixed and placed in a screw extruder, melt-extruded on the surface of the cable core at 270°C, and the thickness of the protective cover was 0.09 mm. The mixture was transferred to a drying oven and dried at 80°C for 5 hours to obtain a prefabricated cable;

[0034] (3) 30 parts of dithiothreitol were dissolved in 90 parts of anhydrous ethanol, stirred at 300 r / min for 30 min under a nitrogen atmosphere, 15 parts of activated clay with a particle size of 0.70 mm were added to the solution, and stirring was continued for 40 min. The solution was transferred into a reactor and reacted at 80° C. for 5 h. The mixture was naturally cooled, and 30 parts of tetraallyloxyethane were added. The mixture was stirred at 300 r / min for 18 h at 40° C. and centrifuged at 10,000 rpm for 30 min to obtain a solid sample. The solution was repeatedly washed with deionized water for 5 times to obtain modified activated clay.

[0035] (4) 30 parts of modified activated clay were placed in 150 parts of anhydrous ethanol, and ultrasonically dispersed at a frequency of 200 kHz for 30 minutes to obtain a solution C. The solution was stirred at a speed of 800 r / min at room temperature for 6 hours, and the solution C was evenly sprayed onto the surface of 1250 parts of the prefabricated cables prepared in step (2) using an ultrasonic spray gun. After spraying, the solution was placed in an oven for drying to obtain a flame-retardant and corrosion-resistant power cable.

[0036] Example 3

[0037] (1) 30 parts of tea polyphenols are dissolved in 80 parts of anhydrous ethanol, 50 parts of a 50% NaOH aqueous solution are added, and the mixture is mixed to obtain a solution A; 30 parts of o-chlorocinnamaldehyde are dissolved in 100 parts of anhydrous ethanol, and the mixture is mixed to obtain a solution B; solution B is added to solution A at a rate of 1.5 drops / s while stirring at 70°C and 300 r / min, and the mixture is refluxed and kept warm for 3 hours, and then the temperature is raised to 100°C within 30 minutes and kept warm for 2 hours, 10 to 20 parts of alumina with a particle size of 80 nm are added, and the mixture is stirred at 90°C and 500 r / min for 3 hours, and then a vacuum pump is connected to the mixture and the solvent is removed by distillation at 95°C with a reduced pressure of 0.07 MPa for 4 hours, and a self-made antiseptic is obtained after the reaction is completed;

[0038] (2) 60 parts of ethylene propylene rubber, 50 parts of hydrogenated butyl rubber, 40 parts of hydroxy silicone oil, 10 parts of homemade anticorrosive agent, 5 parts of di-tert-butyl peroxide, and 5 parts of vinyl triaminomethoxysilane were mixed and placed in a screw extruder, melt-extruded on the surface of the cable core at 270°C, and the thickness of the protective cover was 0.09 mm. The mixture was transferred to a drying oven and dried at 80°C for 5 hours to obtain a prefabricated cable;

[0039] (3) 40 parts of dithiothreitol were dissolved in 100 parts of anhydrous ethanol, stirred at 300 r / min for 30 min under a nitrogen atmosphere, 20 parts of activated clay with a particle size of 0.70 mm were added to the solution, and stirring was continued for 40 min. The solution was transferred into a reactor and reacted at 80° C. for 5 h. The mixture was naturally cooled, and 40 parts of tetraallyloxyethane were added. The mixture was stirred at 300 r / min for 18 h at 40° C. and centrifuged at 10,000 rpm for 30 min to obtain a solid sample. The solution was repeatedly washed with deionized water for 5 times to obtain modified activated clay.

[0040] (4) 40 parts of modified activated clay were placed in 200 parts of anhydrous ethanol, and ultrasonically dispersed at a frequency of 200 kHz for 30 minutes to obtain a solution C. The mixture was stirred at a speed of 800 r / min at room temperature for 6 hours. The solution C was evenly sprayed onto the surface of 1500 parts of the prefabricated cables prepared in step (2) using an ultrasonic spray gun. After spraying, the prefabricated cables were placed in an oven for drying to obtain flame-retardant and corrosion-resistant power cables.

[0041] Comparative Example 1

[0042] (1) 50 parts of ethylene propylene rubber, 40 parts of hydrogenated butyl rubber, 30 parts of hydroxy silicone oil, 3 parts of di-tert-butyl peroxide, and 3 parts of vinyl triaminomethoxysilane were mixed and placed in a screw extruder, melt-extruded on the surface of the cable core at 270° C., and the thickness of the protective cover was 0.09 mm. The mixture was transferred to a drying oven and dried at 80° C. for 5 h to obtain a prefabricated cable;

[0043] (2) 30 parts of dithiothreitol were dissolved in 90 parts of anhydrous ethanol, stirred at 300 r / min for 30 min under a nitrogen atmosphere, 15 parts of activated clay with a particle size of 0.70 mm were added to the solution, and stirring was continued for 40 min. The solution was transferred into a reactor and reacted at 80° C. for 5 h. The mixture was naturally cooled, and 30 parts of tetraallyloxyethane were added. The mixture was stirred at 300 r / min for 18 h at 40° C. and centrifuged at 10,000 rpm for 30 min to obtain a solid sample. The solution was repeatedly washed with deionized water for 5 times to obtain modified activated clay.

[0044] (3) 30 parts of modified activated clay were placed in 150 parts of anhydrous ethanol, and ultrasonically dispersed at a frequency of 200 kHz for 30 minutes to obtain a solution C. The solution C was stirred at a speed of 800 r / min at room temperature for 6 hours, and an ultrasonic spray gun was used to evenly spray the solution C onto the surface of 1250 parts of the prefabricated cables prepared in step (2). After spraying, the solution was placed in an oven for drying to obtain a flame-retardant and corrosion-resistant power cable.

[0045] Comparative Example 2

[0046] (1) Dissolve 20 parts of tea polyphenols in 65 parts of anhydrous ethanol, add 40 parts of a 50% NaOH aqueous solution, mix to obtain solution A, dissolve 20 parts of o-chlorocinnamaldehyde in 90 parts of anhydrous ethanol, mix to obtain solution B; add solution B to solution A at a rate of 1.5 drops / s while stirring at 70°C and 300 r / min, reflux and keep warm for 3 hours, then raise the temperature to 100°C within 30 minutes, keep warm for 2 hours, then connect a vacuum pump at 95°C and reduce the pressure to 0.07 MPa for 4 hours to remove the solvent, and obtain a homemade antiseptic;

[0047] (2) 50 parts of ethylene propylene rubber, 40 parts of hydrogenated butyl rubber, 30 parts of hydroxy silicone oil, 8 parts of homemade anticorrosive agent, 3 parts of di-tert-butyl peroxide, and 3 parts of vinyl triaminomethoxysilane were mixed and placed in a screw extruder, melt-extruded on the surface of the cable core at 270°C, and the thickness of the protective cover was 0.09 mm. The mixture was transferred to a drying oven and dried at 80°C for 5 hours to obtain a prefabricated cable;

[0048] (3) 30 parts of dithiothreitol were dissolved in 90 parts of anhydrous ethanol, stirred at 300 r / min for 30 min under a nitrogen atmosphere, 15 parts of activated clay with a particle size of 0.70 mm were added to the solution, and stirring was continued for 40 min. The solution was transferred into a reactor and reacted at 80° C. for 5 h. The mixture was naturally cooled, and 30 parts of tetraallyloxyethane were added. The mixture was stirred at 300 r / min for 18 h at 40° C. and centrifuged at 10,000 rpm for 30 min to obtain a solid sample. The solution was repeatedly washed with deionized water for 5 times to obtain modified activated clay.

[0049] (4) 30 parts of modified activated clay were placed in 150 parts of anhydrous ethanol, and ultrasonically dispersed at a frequency of 200 kHz for 30 minutes to obtain a solution C. The solution was stirred at a speed of 800 r / min at room temperature for 6 hours, and the solution C was evenly sprayed onto the surface of 1250 parts of the prefabricated cables prepared in step (2) using an ultrasonic spray gun. After spraying, the solution was placed in an oven for drying to obtain a flame-retardant and corrosion-resistant power cable.

[0050] Comparative Example 3

[0051] (1) 50 parts of ethylene propylene rubber, 40 parts of hydrogenated butyl rubber, 30 parts of hydroxy silicone oil, 8 parts of aluminum oxide with a particle size of 80 nm, 3 parts of di-tert-butyl peroxide, and 3 parts of vinyl triaminomethoxysilane were mixed and placed in a screw extruder, melt-extruded on the surface of the cable core at 270° C., and the thickness of the protective cover was 0.09 mm. The mixture was transferred to a drying oven and dried at 80° C. for 5 h to obtain a prefabricated cable;

[0052] (2) 30 parts of dithiothreitol were dissolved in 90 parts of anhydrous ethanol, stirred at 300 r / min for 30 min under a nitrogen atmosphere, 15 parts of activated clay with a particle size of 0.70 mm were added to the solution, and stirring was continued for 40 min. The solution was transferred into a reactor and reacted at 80° C. for 5 h. The mixture was naturally cooled, and 30 parts of tetraallyloxyethane were added. The mixture was stirred at 300 r / min for 18 h at 40° C. and centrifuged at 10,000 rpm for 30 min to obtain a solid sample. The solution was repeatedly washed with deionized water for 5 times to obtain modified activated clay.

[0053] (3) 30 parts of modified activated clay were placed in 150 parts of anhydrous ethanol, and ultrasonically dispersed at a frequency of 200 kHz for 30 minutes to obtain a solution C. The solution C was stirred at a speed of 800 r / min at room temperature for 6 hours, and an ultrasonic spray gun was used to evenly spray the solution C onto the surface of 1250 parts of the prefabricated cables prepared in step (2). After spraying, the solution was placed in an oven for drying to obtain a flame-retardant and corrosion-resistant power cable.

[0054] Comparative Example 4

[0055] (1) 20 parts of tea polyphenols are dissolved in 65 parts of anhydrous ethanol, 40 parts of a 50% NaOH aqueous solution are added, and the mixture is mixed to obtain a solution A; 20 parts of o-chlorocinnamaldehyde are dissolved in 90 parts of anhydrous ethanol, and the mixture is mixed to obtain a solution B; solution B is added to solution A at a rate of 1.5 drops / s while stirring at 70°C and 300 r / min, and the mixture is refluxed and kept warm for 3 hours, then the temperature is raised to 100°C within 30 minutes, kept warm for 2 hours, 15 parts of alumina with a particle size of 80 nm are added, and the mixture is stirred at 90°C and 500 r / min for 3 hours, and then a vacuum pump is connected to the mixture and the solvent is removed by distillation at 95°C with a reduced pressure of 0.07 MPa for 4 hours, and a self-made antiseptic is obtained after the mixture is finished;

[0056] (2) 50 parts of ethylene propylene rubber, 40 parts of hydrogenated butyl rubber, 30 parts of hydroxy silicone oil, 8 parts of homemade anticorrosive agent, 3 parts of di-tert-butyl peroxide, and 3 parts of vinyl triaminomethoxysilane were mixed and placed in a screw extruder, melt-extruded on the surface of the cable core at 270°C, and the thickness of the protective sheath was 0.09 mm. The cable was transferred to a drying oven and dried at 80°C for 5 hours to obtain a cable.

[0057] Comparative Example 5

[0058] (1) 20 parts of tea polyphenols are dissolved in 65 parts of anhydrous ethanol, 40 parts of a 50% NaOH aqueous solution are added, and the mixture is mixed to obtain a solution A; 20 parts of o-chlorocinnamaldehyde are dissolved in 90 parts of anhydrous ethanol, and the mixture is mixed to obtain a solution B; solution B is added to solution A at a rate of 1.5 drops / s while stirring at 70°C and 300 r / min, and the mixture is refluxed and kept warm for 3 hours, then the temperature is raised to 100°C within 30 minutes, kept warm for 2 hours, 15 parts of alumina with a particle size of 80 nm are added, and the mixture is stirred at 90°C and 500 r / min for 3 hours, and then a vacuum pump is connected to the mixture and the solvent is removed by distillation at 95°C with a reduced pressure of 0.07 MPa for 4 hours, and a self-made antiseptic is obtained after the mixture is finished;

[0059] (2) 50 parts of ethylene propylene rubber, 40 parts of hydrogenated butyl rubber, 30 parts of hydroxy silicone oil, 8 parts of homemade anticorrosive agent, 3 parts of di-tert-butyl peroxide, and 3 parts of vinyl triaminomethoxysilane were mixed and placed in a screw extruder, melt-extruded on the surface of the cable core at 270°C, and the thickness of the protective cover was 0.09 mm. The mixture was transferred to a drying oven and dried at 80°C for 5 hours to obtain a prefabricated cable;

[0060] (3) 30 parts of activated clay were placed in 150 parts of anhydrous ethanol, and ultrasonically dispersed at a frequency of 200 kHz for 30 minutes to obtain a solution C. The solution C was stirred at a speed of 800 r / min at room temperature for 6 hours. The solution C was evenly sprayed onto the surface of 1250 parts of the prefabricated cables prepared in step (2) using an ultrasonic spray gun. After spraying, the solution was placed in an oven for drying to obtain a flame-retardant and corrosion-resistant power cable.

[0061] Effect example

[0062] The following Table 1 shows the analysis results of the corrosion resistance and limiting oxygen index of Examples 1 to 3 of the present invention and Comparative Examples 1 to 5.

[0063] Table 1 Corrosion resistance and limiting oxygen index of Examples 1 to 3 and Comparative Examples 1 to 5

[0064]

[0065]

[0066] By comparing the corrosion resistance and limiting oxygen index results of the examples and comparative examples, we found that the flame-retardant and corrosion-resistant power cable prepared by the present invention has high corrosion resistance and flame retardancy. By comparing the results of the examples and comparative examples 1-3, we found that the corrosion resistance of the cable substrate not modified with phenolic resin was significantly reduced, and when alumina was not added, the flame retardant effect of the prepared cable was relatively low. The protective layer formed by spraying activated clay also shows good corrosion resistance and flame retardancy. The synergistic effect of the two components significantly improves the flame retardant and corrosion resistance of the cable prepared by the present invention.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A flame retardant and corrosion resistant power cable, characterized in that: The flame-retardant and corrosion-resistant protective sheath of the power cable is prepared by first mixing ethylene propylene rubber, hydrogenated butyl rubber, hydroxy silicone oil, a homemade anticorrosive agent, an initiator, and a crosslinking agent, kneading the mixture through a screw extruder, drawing a sheet and cooling it to obtain a cable protective sheath substrate, and then spraying modified activated clay onto the surface of the cable protective sheath substrate to obtain the coating after curing.

2. The flame-retardant and corrosion-resistant power cable according to claim 1, characterized in that: The self-made antiseptic is prepared by polymerizing o-chlorocinnamaldehyde and tea polyphenols to form a phenolic resin, which is further compounded with nano-alumina.

3. The flame-retardant and corrosion-resistant power cable according to claim 1, characterized in that: The modified activated clay is prepared by organically modifying the activated clay with dithiothreitol in advance and then reacting the modified activated clay with tetraallyloxyethane to form a click-photocuring reaction.

4. The flame-retardant and corrosion-resistant power cable according to claim 1, characterized in that: The Mooney viscosity of the ethylene-propylene rubber is 30-80, the Mooney viscosity of the hydrogenated butyl rubber is 50-150, and the viscosity of the hydroxy silicone oil is 500-1000CS.

5. The flame-retardant and corrosion-resistant power cable according to claim 1, characterized in that: The initiator is one or more of dicumyl peroxide, dibenzoyl peroxide, di-tert-butyl peroxide and organic tin compounds, and the crosslinking agent is vinyl triaminomethoxysilane.

6. A method for preparing a flame-retardant and corrosion-resistant power cable, characterized in that: The method comprises the following preparation steps: (1) Dissolve 10 to 30 parts of tea polyphenols in 50 to 80 parts of anhydrous ethanol, add 30 to 50 parts of a 50% by mass aqueous solution of NaOH, and mix to obtain solution A; Dissolve 10 to 30 parts of o-chlorocinnamaldehyde in 80 to 100 parts of anhydrous ethanol, and mix to obtain solution B; Add solution B to solution A at a rate of 0.5 to 2 drops / s while stirring at 50 to 80° C. and 200 to 400 r / min. Reflux and keep warm for 1 to 3 hours, then raise the temperature to 90 to 120°C within 20 to 40 minutes, keep warm for 1 to 2 hours, add 10 to 20 parts of aluminum oxide with a particle size of 50 to 100 nm, stir at 80 to 100°C and 300 to 600 r / min for 1 to 3 hours, then connect a vacuum pump and reduce the pressure to 0.01 to 0.09 MPa at 90 to 100°C and distill for 2 to 6 hours to remove the solvent, and obtain a homemade anticorrosive agent after completion; (2) Mix ethylene propylene rubber, hydrogenated butyl rubber, hydroxy silicone oil, homemade anticorrosive agent, initiator and crosslinking agent in a screw extruder, melt extrude on the surface of the cable core at 250-300° C., the protective cover has a thickness of 0.06-0.10 mm, transfer to a drying oven, dry at 50-90° C. for 3-6 hours, and obtain a prefabricated cable; (3) dissolving dithiothreitol in anhydrous ethanol, stirring at 200-400 r / min for 20-40 min under nitrogen atmosphere, adding activated clay with a particle size of 0.30-0.80 mm to the solution, continuing stirring for 20-40 min, transferring to a reactor, reacting at 60-100° C. for 3-6 h, cooling naturally, and then adding tetraallyloxyethane, stirring at 200-400 r / min for 12-24 h at 30-50° C., centrifuging at 8000-12000 rpm for 20-40 min to obtain a solid sample, and repeatedly washing with deionized water for 4-8 times to obtain modified activated clay; (4) taking the modified activated clay and placing it in anhydrous ethanol, ultrasonically dispersing it at a frequency of 100 to 300 kHz for 20 to 40 minutes to obtain a solution C, and continuing to stir at a speed of 500 to 1000 r / min at room temperature for 5 to 8 hours, using an ultrasonic spray gun to evenly spray the solution C onto the surface of the prefabricated cable prepared in step (2), and after spraying, placing it in an oven for drying to obtain a flame-retardant and corrosion-resistant power cable.

7. The method for preparing a flame-retardant and corrosion-resistant power cable according to claim 6, characterized in that: In the step (2), the cable base material comprises, by weight, 40 to 60 parts of ethylene propylene rubber, 30 to 50 parts of hydrogenated butyl rubber, 20 to 40 parts of hydroxy silicone oil, 5 to 10 parts of a homemade anticorrosive agent, 1 to 5 parts of an initiator, and 1 to 5 parts of a crosslinking agent.

8. The method for preparing a flame-retardant and corrosion-resistant power cable according to claim 6, characterized in that: In the step (3), the modified activated clay comprises 20 to 40 parts of dithiothreitol, 80 to 100 parts of anhydrous ethanol, 10 to 20 parts of activated clay and 20 to 40 parts of tetraallyloxyethane, by weight.

9. The method for preparing a flame-retardant and corrosion-resistant power cable according to claim 6, characterized in that: In the step (4), the flame retardant and corrosion resistant power cable comprises 20 to 40 parts of modified activated clay, 100 to 200 parts of anhydrous ethanol, and 1000 to 1500 parts of prefabricated cable in terms of weight.

10. The method for preparing a flame-retardant and corrosion-resistant power cable according to claim 6, characterized in that: In the step (4), the oven drying temperature is 60 to 80° C. and the drying time is 24 to 48 hours.

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