A puncture-resistant insulated power cable and a method for producing the same

Abstract

The application discloses a kind of breakdown-resistant insulated power cable and preparation method thereof, by copper wire stranding is formed into core, in turn, the surface of core is covered with reinforced resin to form insulation layer, copper wire metal shielding band is formed into shielding layer and reinforced resin is formed into protective layer, and breakdown-resistant insulated power cable is prepared, there is huge interface area between the synergistic filler in reinforced resin and resin matrix, the surface zinc oxide makes effective interface area further increase, further improve the number of trap, due to the difference between physical and chemical properties, a large number of low-energy deep level traps are formed at the interface, these deep traps can effectively capture and freeze injected carriers, prevent them from long-distance migration and accumulation, charges are fixed in trap, cannot form large-scale space charge package, so as to uniform internal electric field, prevent local electric field from being too high and cause breakdown, while the inside of synergistic filler contains gap, can hinder breakdown development.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing, specifically to a breakdown-resistant insulated power cable and its manufacturing method. Background Technology

[0002] In power systems, cables are crucial equipment for transmitting electrical energy. Especially in high-temperature environments, such as power plants, substations, and industrial manufacturing, the application of high-temperature resistant power cables is paramount. While traditional power cable protective layers provide good protection under normal operating conditions, they are prone to melting or embrittlement at extreme temperatures, leading to decreased power transmission performance and potentially causing safety hazards. To meet these needs, researchers have begun exploring the possibilities of various materials, among which polyethylene has been extensively studied due to its excellent chemical resistance, toughness, and processing properties. However, unmodified polyethylene cable materials, under high voltage, suffer insulation degradation, allowing current to flow through the insulation layer, causing short circuits or faults, and in severe cases, safety accidents. Summary of the Invention

[0003] The purpose of this invention is to provide a breakdown-resistant insulated power cable and its preparation method, which solves the problem of poor breakdown resistance of current power cable materials.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A method for preparing a breakdown-resistant insulated power cable specifically includes the following steps:

[0006] Step A1: Mix the modified filler, acrylic acid, p-toluenesulfonic acid and toluene, and react them for 3-5 hours at a speed of 150-200 r / min and a temperature of 115-120℃ to obtain the active filler. Mix the active filler, dimethylchlorosilane, caster catalyst and DMF, and purge with nitrogen gas for protection. React them for 6-8 hours at a speed of 120-150 r / min and a temperature of 80-85℃ to obtain the functionalized filler.

[0007] Step A2: Mix lithium trimethylsilanolate and tetrahydrofuran evenly, purge with nitrogen, stir and add trifluoropropylmethylcyclotrisiloxane at 120-150 r / min and 0℃, heat to 20-25℃ and react for 6-8 h, then add functionalized filler and react for 1-1.5 h to obtain the synergistic filler;

[0008] Step A3: Weigh the following raw materials by weight: 30-50 parts low-density polyethylene, 70-100 parts styrene-ethylene-butene-styrene block copolymer, 6-10 parts synergistic filler, 0.15-0.2 parts antioxidant 1010 and 0.15-0.2 parts antioxidant 168. Melt and extrude the raw materials to obtain a reinforcing resin. Twist copper wires to form a core. Sequentially coat the core surface with reinforcing resin to form an insulation layer, copper wire metal shielding tape to form a shielding layer, and reinforcing resin to form a protective layer to obtain a breakdown-resistant insulated power cable.

[0009] Furthermore, in step A1, the molar ratio of hydroxyl groups on the modified filler to acrylic acid is 1:1, the amount of p-toluenesulfonic acid is 3% of the mass of acrylic acid, the molar ratio of double bonds on the active filler to dimethylchlorosilane is 1:1, and the amount of caster catalyst is 0.01% of the mass of dimethylchlorosilane.

[0010] Furthermore, the molar ratio of lithium trimethylsilanolate, trifluoropropylmethylcyclotrisiloxane, and the Si-Cl bond on the functional filler in step A2 is 1:4:1.

[0011] Furthermore, the modified filler is prepared by the following steps:

[0012] Step B1: Sorbitan monostearate and cyclohexane are mixed and purged with nitrogen. The mixture is stirred for 30-40 minutes at a speed of 200-300 r / min and a temperature of 25-30℃. Acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate and deionized water are then added. The mixture is heated to 68-70℃ and reacted for 3-5 hours to obtain polyacrylamide microspheres.

[0013] Step B2: Mix polyacrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water and ammonia water evenly, and react for 10-15 hours at a speed of 60-80 r / min and a temperature of 40-50℃. After filtration to remove the filtrate, dry the substrate, and calcine it at 550-600℃ at a heating rate of 2-5℃ for 3-5 hours to obtain porous silica.

[0014] Step B3: Mix porous silica and zinc chloride solution, stir for 30-40 min at a speed of 150-200 r / min and a temperature of 20-25℃, add hydroxide solution to maintain pH at 10, react for 2-3 h, filter to remove filtrate, dry the substrate and place it in a muffle furnace, heat to 500-550℃ at a heating rate of 10℃ / min under a nitrogen atmosphere, and calcine for 3-5 h to obtain the precursor;

[0015] Step B4: Disperse the precursor in ethanol, stir and add KH550 at a speed of 200-300 r / min, a temperature of 60-70℃, and a pH of 8-9, and react for 3-5 h to obtain a pretreated precursor. Mix the pretreated precursor, benzyl dimethylamine and DMF evenly, purge with nitrogen for protection, stir and add 3,4-epoxy-1-butene at a speed of 200-300 r / min and a temperature of 50-60℃, and react for 2-3 h to obtain the modified filler.

[0016] Furthermore, the ratio of sorbitan monostearate, cyclohexane, acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate, and deionized water in step B1 is 0.6g:90mL:2g:0.1g:0.12g:10mL.

[0017] Furthermore, in step B2, the ratio of acrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water, and ammonia is 0.3g:3mL:40mL:1.5mL:1mL, and the mass fraction of ammonia is 25%.

[0018] Furthermore, in step B3, the ratio of porous silica to zinc chloride solution is 2g:5mL, and the zinc chloride solution has a mass fraction of 20%.

[0019] Furthermore, the amount of KH550 used in step B4 is 2% of the precursor mass, the molar ratio of amino groups and 3,4-epoxy-1-butene on the pretreated precursor is 1:2, and the amount of benzyl dimethylamine used is 3% of the mass of 3,4-epoxy-1-butene.

[0020] The beneficial effects of this invention: This application discloses a breakdown-resistant insulated power cable, which is made by stranding copper conductors to form a core, then sequentially coating the core surface with reinforcing resin to form an insulation layer, copper wire metal shielding tape to form a shielding layer, and reinforcing resin to form a protective layer. The reinforcing resin includes the following raw materials: low-density polyethylene, styrene-ethylene-butene-styrene block copolymer, synergistic filler, antioxidant 1010, and antioxidant 168. The synergistic filler is made from modified filler and acrylic acid, and is produced by reacting p-toluene... Under the action of sulfonic acid, the hydroxyl groups on the modified filler and the carboxyl groups on the acrylic acid are esterified to obtain an active filler. The active filler is reacted with dimethylchlorosilane, so that the double bonds on the active filler react with the Si-H bonds on the dimethylchlorosilane to obtain a functionalized filler. Trimethylsilyl alcohol lithium is used as an initiator and trifluoropropylmethylcyclotrisiloxane is used as a polymerization monomer to form a polysiloxane with fluoroalkane side chains and lithium silanolate at one end. Then, functionalized filler is added, so that the Si-Cl bonds on the functionalized filler react with lithium silanolate to obtain an enhanced filler.

[0021] The modified filler was prepared by using acrylamide and N,N'-methylenebisacrylamide as raw materials to obtain polyacrylamide microspheres. Using the polyacrylamide microspheres as templates, tetraethyl orthosilicate was hydrolyzed and condensed under the catalysis of ammonia water to deposit silica on the surface of the microspheres. After calcination, the template was removed to form a porous structure, thus obtaining porous silica. The porous silica was mixed with zinc chloride solution, and zinc hydroxide was formed under the action of sodium hydroxide. Zinc hydroxide was loaded into the pores of the porous silica and then calcined at high temperature to form zinc oxide, thus obtaining a precursor. The precursor was treated with KH550 to graft amino groups onto the surface, thus obtaining a pretreated precursor. The pretreated precursor was reacted with 3,4-epoxy-1-butene, so that the amino groups on the surface of the pretreated precursor reacted with the epoxy groups on the 3,4-epoxy-1-butene, thus obtaining the modified filler.

[0022] The addition of this synergistic filler creates a large interfacial region between it and the resin matrix. The zinc oxide on the surface further increases the effective interfacial area and enhances the number of traps. Due to the difference in physicochemical properties between the two, a large number of low-energy deep-level traps are formed at the interface. These deep traps can effectively capture and freeze the injected charge carriers, preventing them from migrating and accumulating over long distances. The charge is fixed in the traps, preventing the formation of large-scale space charge packets, thus homogenizing the internal electric field and preventing excessively high local electric fields that could lead to breakdown. At the same time, the synergistic filler contains gaps that can hinder breakdown development. The fluorinated polysiloxane on the surface of the synergistic filler can increase the overall free volume of the polymer, providing more detour paths for the movement of charge carriers, thereby reducing conductivity, reducing charge injection and accumulation, and thus increasing breakdown resistance. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: A method for preparing a breakdown-resistant insulated power cable, specifically including the following steps:

[0025] Step A1: The modified filler, acrylic acid, p-toluenesulfonic acid and toluene are mixed and reacted at 150 r / min and 115℃ for 3 h to obtain the active filler. The active filler, dimethylchlorosilane, caster catalyst and DMF are mixed and reacted under nitrogen protection at 120 r / min and 80℃ for 6 h to obtain the functionalized filler.

[0026] Step A2: Mix lithium trimethylsilanolate and tetrahydrofuran evenly, purge with nitrogen, stir and add trifluoropropylmethylcyclotrisiloxane at 120 r / min and 0℃, heat to 20℃ and react for 6 h, then add functionalized filler and react for 1 h to obtain the enhanced filler.

[0027] Step A3: Weigh the following raw materials by weight: 30 parts low-density polyethylene, 70 parts styrene-ethylene-butene-styrene block copolymer, 6 parts synergistic filler, 0.15 parts antioxidant 1010 and 0.15 parts antioxidant 168. Melt and extrude the raw materials to obtain a reinforcing resin. Twist copper wires to form a core. Sequentially coat the core surface with reinforcing resin to form an insulation layer, copper wire metal shielding tape to form a shielding layer, and reinforcing resin to form a protective layer to obtain a breakdown-resistant insulated power cable.

[0028] The molar ratio of hydroxyl groups to acrylic acid on the modified filler described in step A1 is 1:1, the amount of p-toluenesulfonic acid is 3% of the mass of acrylic acid, the molar ratio of double bonds to dimethylchlorosilane on the active filler is 1:1, and the amount of cassiterite catalyst is 0.01% of the mass of dimethylchlorosilane.

[0029] The molar ratio of lithium trimethylsilanolate, trifluoropropylmethylcyclotrisiloxane and the Si-Cl bond on the functional filler in step A2 is 1:4:1.

[0030] The low-density polyethylene mentioned in step A3 is model 2426H, and the styrene-ethylene-butene-styrene block copolymer is model 7551.

[0031] The modified filler is prepared by the following steps:

[0032] Step B1: Sorbitan monostearate and cyclohexane were mixed and purged with nitrogen. The mixture was stirred for 30 minutes at 200 r / min and 25°C. Acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate and deionized water were added. The mixture was heated to 68°C and reacted for 3 hours to obtain polyacrylamide microspheres.

[0033] Step B2: Polyacrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water and ammonia are mixed evenly and reacted at 60 r / min and 40℃ for 10 h. The filtrate is then removed by filtration, the substrate is dried, and the temperature is raised to 550℃ at a rate of 2℃ and calcined for 3 h to obtain porous silica.

[0034] Step B3: Mix porous silica and zinc chloride solution, stir for 30 min at 150 r / min and 20 °C, add hydroxide solution to maintain pH 10, react for 2 h, filter to remove filtrate, dry the substrate and place it in a muffle furnace, heat to 500 °C at a heating rate of 10 °C / min under nitrogen atmosphere, and calcine for 3 h to obtain the precursor;

[0035] Step B4: Disperse the precursor in ethanol, stir and add KH550 at a speed of 200 r / min, a temperature of 60℃, and a pH of 8, and react for 3 h to obtain a pretreated precursor. Mix the pretreated precursor, benzyl dimethylamine and DMF evenly, purge with nitrogen, stir and add 3,4-epoxy-1-butene at a speed of 200 r / min and a temperature of 50℃, and react for 2 h to obtain the modified filler.

[0036] The ratio of sorbitan monostearate, cyclohexane, acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate and deionized water in step B1 is 0.6g:90mL:2g:0.1g:0.12g:10mL.

[0037] The ratio of acrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water and ammonia in step B2 is 0.3g:3mL:40mL:1.5mL:1mL, and the mass fraction of ammonia is 25%.

[0038] The ratio of porous silica to zinc chloride solution in step B3 is 2g:5mL, and the zinc chloride solution has a mass fraction of 20%.

[0039] In step B4, the amount of KH550 used is 2% of the precursor mass, the molar ratio of amino groups and 3,4-epoxy-1-butene on the pretreated precursor is 1:2, and the amount of benzyl dimethylamine used is 3% of the mass of 3,4-epoxy-1-butene.

[0040] Example 2: A method for preparing a breakdown-resistant insulated power cable, specifically including the following steps:

[0041] Step A1: The modified filler, acrylic acid, p-toluenesulfonic acid and toluene are mixed and reacted at 150 r / min and 120℃ for 4 h to obtain the active filler. The active filler, dimethylchlorosilane, caster catalyst and DMF are mixed and reacted under nitrogen protection at 120 r / min and 83℃ for 7 h to obtain the functionalized filler.

[0042] Step A2: Mix lithium trimethylsilanolate and tetrahydrofuran evenly, purge with nitrogen, stir and add trifluoropropylmethylcyclotrisiloxane at 120 r / min and 0℃, heat to 25℃ and react for 7 h, then add functionalized filler and react for 1-1.5 h to obtain the synergistic filler.

[0043] Step A3: Weigh the following raw materials by weight: 40 parts low-density polyethylene, 85 parts styrene-ethylene-butene-styrene block copolymer, 8 parts synergistic filler, 0.18 parts antioxidant 1010 and 0.18 parts antioxidant 168. Melt and extrude the raw materials to obtain a reinforcing resin. Twist copper wires to form a core. Sequentially coat the core surface with reinforcing resin to form an insulation layer, copper wire metal shielding tape to form a shielding layer, and reinforcing resin to form a protective layer to obtain a breakdown-resistant insulated power cable.

[0044] The molar ratio of hydroxyl groups to acrylic acid on the modified filler described in step A1 is 1:1, the amount of p-toluenesulfonic acid is 3% of the mass of acrylic acid, the molar ratio of double bonds to dimethylchlorosilane on the active filler is 1:1, and the amount of cassiterite catalyst is 0.01% of the mass of dimethylchlorosilane.

[0045] The molar ratio of lithium trimethylsilanolate, trifluoropropylmethylcyclotrisiloxane and the Si-Cl bond on the functional filler in step A2 is 1:4:1.

[0046] The low-density polyethylene mentioned in step A3 is model 2426H, and the styrene-ethylene-butene-styrene block copolymer is model 7551.

[0047] The modified filler is prepared by the following steps:

[0048] Step B1: Sorbitan monostearate and cyclohexane were mixed and purged with nitrogen. The mixture was stirred for 35 minutes at a speed of 200 r / min and a temperature of 30°C. Acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate and deionized water were added. The mixture was heated to 68°C and reacted for 4 hours to obtain polyacrylamide microspheres.

[0049] Step B2: Polyacrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water and ammonia are mixed evenly and reacted at 60 r / min and 45℃ for 13 h. The filtrate is then removed by filtration, the substrate is dried, and the temperature is raised to 550℃ at a rate of 5℃ and calcined for 4 h to obtain porous silica.

[0050] Step B3: Mix porous silica and zinc chloride solution, stir for 35 min at 200 r / min and 20 °C, add hydroxide solution to maintain pH 10, react for 3 h, filter to remove filtrate, dry the substrate and place it in a muffle furnace, heat to 530 °C at a heating rate of 10 °C / min under nitrogen atmosphere, and calcine for 4 h to obtain the precursor;

[0051] Step B4: Disperse the precursor in ethanol, stir and add KH550 at a speed of 300 r / min, a temperature of 65℃, and a pH of 8, and react for 4 h to obtain a pretreated precursor. Mix the pretreated precursor, benzyl dimethylamine and DMF evenly, purge with nitrogen, stir and add 3,4-epoxy-1-butene at a speed of 200 r / min and a temperature of 55℃, and react for 3 h to obtain the modified filler.

[0052] The ratio of sorbitan monostearate, cyclohexane, acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate and deionized water in step B1 is 0.6g:90mL:2g:0.1g:0.12g:10mL.

[0053] The ratio of acrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water and ammonia in step B2 is 0.3g:3mL:40mL:1.5mL:1mL, and the mass fraction of ammonia is 25%.

[0054] The ratio of porous silica to zinc chloride solution in step B3 is 2g:5mL, and the zinc chloride solution has a mass fraction of 20%.

[0055] In step B4, the amount of KH550 used is 2% of the precursor mass, the molar ratio of amino groups and 3,4-epoxy-1-butene on the pretreated precursor is 1:2, and the amount of benzyl dimethylamine used is 3% of the mass of 3,4-epoxy-1-butene.

[0056] Example 3: A method for preparing a breakdown-resistant insulated power cable, specifically including the following steps:

[0057] Step A1: The modified filler, acrylic acid, p-toluenesulfonic acid and toluene are mixed and reacted at 200 r / min and 120℃ for 5 h to obtain the active filler. The active filler, dimethylchlorosilane, caster catalyst and DMF are mixed and reacted under nitrogen protection at 150 r / min and 85℃ for 8 h to obtain the functionalized filler.

[0058] Step A2: Mix lithium trimethylsilanolate and tetrahydrofuran evenly, purge with nitrogen, stir and add trifluoropropylmethylcyclotrisiloxane at 150 r / min and 0℃, heat to 25℃ and react for 8 h, then add functionalized filler and react for 1.5 h to obtain the synergistic filler.

[0059] Step A3: Weigh the following raw materials by weight: 50 parts low-density polyethylene, 100 parts styrene-ethylene-butene-styrene block copolymer, 10 parts synergistic filler, 0.2 parts antioxidant 1010 and 0.2 parts antioxidant 168. Melt and extrude the raw materials to obtain a reinforcing resin. Twist copper wires to form a core. Sequentially coat the core surface with reinforcing resin to form an insulation layer, copper wire metal shielding tape to form a shielding layer, and reinforcing resin to form a protective layer to obtain a breakdown-resistant insulated power cable.

[0060] The molar ratio of hydroxyl groups to acrylic acid on the modified filler described in step A1 is 1:1, the amount of p-toluenesulfonic acid is 3% of the mass of acrylic acid, the molar ratio of double bonds to dimethylchlorosilane on the active filler is 1:1, and the amount of cassiterite catalyst is 0.01% of the mass of dimethylchlorosilane.

[0061] The molar ratio of lithium trimethylsilanolate, trifluoropropylmethylcyclotrisiloxane and the Si-Cl bond on the functional filler in step A2 is 1:4:1.

[0062] The low-density polyethylene mentioned in step A3 is model 2426H, and the styrene-ethylene-butene-styrene block copolymer is model 7551.

[0063] The modified filler is prepared by the following steps:

[0064] Step B1: Sorbitan monostearate and cyclohexane were mixed and purged with nitrogen. The mixture was stirred for 40 minutes at 300 r / min and 30°C. Acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate and deionized water were added. The mixture was heated to 70°C and reacted for 5 hours to obtain polyacrylamide microspheres.

[0065] Step B2: Polyacrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water and ammonia are mixed evenly and reacted at 80 r / min and 50℃ for 15 h. The filtrate is then removed by filtration, the substrate is dried, and the temperature is raised to 600℃ at a rate of 5℃ and calcined for 5 h to obtain porous silica.

[0066] Step B3: Mix porous silica and zinc chloride solution, stir for 40 min at 200 r / min and 25 °C, add hydroxide solution to maintain pH 10, react for 3 h, filter to remove filtrate, dry the substrate and place it in a muffle furnace, heat to 550 °C at a heating rate of 10 °C / min under nitrogen atmosphere, and calcine for 5 h to obtain the precursor;

[0067] Step B4: Disperse the precursor in ethanol, stir and add KH550 at 300 r / min, 70℃, and pH 9, and react for 5 h to obtain the pretreated precursor. Mix the pretreated precursor, benzyl dimethylamine and DMF evenly, purge with nitrogen, stir and add 3,4-epoxy-1-butene at 300 r / min and 60℃, and react for 3 h to obtain the modified filler.

[0068] The ratio of sorbitan monostearate, cyclohexane, acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate and deionized water in step B1 is 0.6g:90mL:2g:0.1g:0.12g:10mL.

[0069] The ratio of acrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water and ammonia in step B2 is 0.3g:3mL:40mL:1.5mL:1mL, and the mass fraction of ammonia is 25%.

[0070] The ratio of porous silica to zinc chloride solution in step B3 is 2g:5mL, and the zinc chloride solution has a mass fraction of 20%.

[0071] In step B4, the amount of KH550 used is 2% of the precursor mass, the molar ratio of amino groups and 3,4-epoxy-1-butene on the pretreated precursor is 1:2, and the amount of benzyl dimethylamine used is 3% of the mass of 3,4-epoxy-1-butene.

[0072] Comparative Example 1: This comparative example uses a modified filler instead of the synergistic filler, but the other steps are the same as in Example 1.

[0073] Comparative Example 2: This comparative example uses porous silica instead of the precursor, but the other steps are the same as in Example 1.

[0074] Comparative Example 3: Compared with Example 1, this comparative example uses hexamethylcyclotrisiloxane instead of trifluoropropylmethylcyclotrisiloxane, and the other steps are the same.

[0075] The reinforcing resins obtained in Examples 1-3 and Comparative Examples 1-3 were used to prepare samples with a thickness of 100 μm. According to the IEC 60243 standard, asymmetrical cylindrical electrodes were used, with the lower electrode having a diameter of 75 mm and serving as the ground electrode, and the upper electrode having a diameter of 25 mm and serving as the high-voltage electrode. A linear voltage boosting method was used, and a DC voltage was applied to the sample at a boosting rate of 1 kV / s until the sample broke down. The breakdown voltage at this point was recorded, and the test results are shown in Table 1 below.

[0076] Table 1

[0077] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Breakdown field strength kV / mm 148 156 159 102 114 131

[0078] As shown in Table 1, this application has excellent breakdown resistance.

[0079] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method of manufacturing a withstand voltage resistant insulated power cable, characterized by: Specifically comprising the following steps: Step A1: the modified filler, acrylic acid, p-toluenesulfonic acid and toluene are mixed and reacted to prepare an active filler, the active filler, dimethylchlorosilane, cast catalyst and DMF are mixed, nitrogen is introduced for protection, and reaction is carried out to prepare a functionalized filler; Step A2: the trimethylsilanol lithium and tetrahydrofuran are mixed uniformly, nitrogen is introduced for protection, stirring is carried out, and then the trifluoropropylmethylcyclotrisiloxane is added, after warming and reaction, the functionalized filler is added, and reaction is carried out to prepare a synergistic filler; Step A3: the following raw materials are weighed: 30-50 parts of low-density polyethylene, 70-100 parts of styrene-ethylene-butylene-styrene block copolymer, 6-10 parts of the synergistic filler, 0.15-0.2 parts of antioxidant 1010 and 0.15-0.2 parts of antioxidant 168, the raw materials are melt-extruded to prepare a reinforced resin, copper wires are twisted to form a wire core, and then the reinforced resin is coated on the surface of the wire core to form an insulation layer, copper wire metal shielding tape is coated to form a shielding layer, and the reinforced resin is coated to form a protective layer to prepare a withstand voltage-resistant insulated power cable; The modified filler is prepared by the following steps: Step B1: the sorbitan monostearate and cyclohexane are mixed, nitrogen is introduced for protection, stirring is carried out, then the acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate and deionized water are added, and warming and reaction are carried out to prepare polyacrylamide microspheres; Step B2: the polyacrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water and ammonia water are mixed uniformly, reaction is carried out, then the filtrate is removed by filtration, the substrate is dried and baked to prepare porous silica; Step B3: the porous silica and zinc chloride solution are mixed and stirred, then the hydroxide solution is added to keep the pH alkaline, reaction is carried out, the filtrate is removed by filtration, the substrate is dried and baked in a muffle furnace to prepare a precursor; Step B4: the precursor is dispersed in ethanol, stirring is carried out, then the KH550 is added, and reaction is carried out to prepare a pretreated precursor, the pretreated precursor, benzyldimethylamine and DMF are mixed uniformly, nitrogen is introduced for protection, stirring is carried out, then the 3,4-epoxy-1-butene is added, and reaction is carried out to prepare the modified filler.

2. A process for the production of a puncture-resistant insulated power cable according to claim 1, characterized in that: The molar ratio of the hydroxyl group on the modified filler in step A1 to the acrylic acid is 1:1, and the amount of p-toluenesulfonic acid is 3% of the mass of the acrylic acid.

3. A process for the production of a withstand voltage resistant insulated power cable according to claim 1, characterized in that: The molar ratio of the trimethylsilanol lithium in step A2 to the Si-Cl bond on the functionalized filler is 1:4:

1.

4. A process for the production of a withstand voltage resistant insulated power cable according to claim 1, characterized in that: The amount ratio of the sorbitan monostearate, cyclohexane, acrylamide, N,N'-methylenebisacrylamide, ammonium persulfate and deionized water in step B1 is 0.6 g:90 mL:2 g:0.1 g:0.12 g:10 mL.

5. A process for the production of a withstand voltage resistant insulated power cable according to claim 1, characterized in that: The amount ratio of the polyacrylamide microspheres, tetraethyl orthosilicate, anhydrous ethanol, deionized water and ammonia water in step B2 is 0.3 g:3 mL:40 mL:1.5 mL:1 mL.

6. A process for the production of a withstand voltage resistant insulated power cable according to claim 1, characterized in that: The amount ratio of the porous silica to the zinc chloride solution in step B3 is 2 g:5 mL.

7. A process for the production of a withstand voltage resistant insulated power cable according to claim 1, characterized in that: The amount of KH550 used in step B4 is 2% of the mass of the precursor, and the molar ratio of the amino group on the precursor before pretreatment to 3,4-epoxy-1-butene is 1:

2.

8. A puncture-resistant insulated power cable, characterized by: Prepared according to the preparation method of any one of claims 1-7.