High temperature resistant power cable and method for manufacturing the same

Abstract

The application discloses a high-temperature-resistant power cable and a preparation method thereof. A copper conductor is twisted to form a core, and an insulating layer, a shielding layer and a protective layer are sequentially coated on the surface of the core to obtain the high-temperature-resistant power cable. The protective layer is a reinforced resin, and the reinforced resin comprises the following raw materials in parts by weight: 100-120 parts of functionalized polyethylene, 20-30 parts of modified filler, 0.5-0.8 parts of p-toluenesulfonic acid and 10-15 parts of 1,4-p-biphenyl boronic acid bis(pinacol) ester. The functionalized polyethylene and the modified filler form an organic-inorganic interpenetrating network under the action of the 1,4-p-biphenyl boronic acid bis(pinacol) ester. The modified filler can form a thermal barrier network in the whole matrix, effectively hinders the thermal motion of the polyethylene molecular chain, and the side chain of the functionalized polyethylene molecular chain contains a phenyl polysiloxane structure, which can increase the flexibility of the polyethylene chain segment. In combination with the formation of dynamic crosslinking, the high-temperature-resistant effect of the material is greatly improved.

Description

Technical Field

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

[0002] In power systems, cables are crucial 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 sheaths 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 explored the possibilities of various materials, among which polyethylene has been extensively studied due to its excellent chemical resistance, toughness, and processing properties. However, traditional polyethylene materials do not perform ideally at high temperatures, particularly in terms of heat resistance and mechanical strength, failing to achieve the required high-temperature resistance. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature resistant power cable and its preparation method, thereby solving the problem of poor high-temperature resistance in current power cables.

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

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

[0006] High-temperature resistant power cables are made by stranding copper wires to form a core, and then sequentially covering the surface of the core with an insulation layer, a shielding layer, and a protective layer.

[0007] The shielding layer is made of polyvinyl chloride, the shielding layer is made of copper wire metal shielding tape, and the protective layer is made of reinforced resin;

[0008] The reinforced resin comprises the following raw materials in parts by weight: 100-120 parts of functionalized polyethylene, 20-30 parts of modified filler, 0.5-0.8 parts of p-toluenesulfonic acid, and 10-15 parts of bis(pinacol) 1,4-diphenylboronic acid. The functionalized polyethylene, p-toluenesulfonic acid, and bis(pinacol) 1,4-diphenylboronic acid are added to a mixer and stirred for 5-10 minutes at a speed of 150-200 r / min and a temperature of 160-170℃. Then, the modified filler is added, and stirring is continued for 10-15 minutes to obtain the reinforced resin.

[0009] Furthermore, the functionalized polyethylene is made by the following steps:

[0010] Step A1: uniformly mix p-nitrostyrene, trichlorosilane, chloroplatinic acid and tetrahydrofuran, protect with nitrogen, under the conditions of 150-200 r / min rotation speed and 50-60℃ temperature, react for 5-7 h to obtain an intermediate, mix lithium dimethylhydrosilanol and tetrahydrofuran, protect with nitrogen, under the conditions of 200-300 r / min rotation speed and 0℃ temperature, stir and add tetramethyltetraphenylcyclotetrasiloxane, warm to 25-30℃, react for 8-10 h, add the intermediate, continue to react for 1-1.5 h to obtain a pretreated polysiloxane;

[0011] Step A2: uniformly mix the pretreated polysiloxane, palladium-carbon catalyst and DMF, protect with hydrogen, under the conditions of 300-500 r / min rotation speed, 75-80℃ temperature and 1-2 MPa pressure, react for 4-6 h to obtain an aminated polysiloxane, mix maleic anhydride and DMF, under the conditions of 200-300 r / min rotation speed and 5-10℃ temperature, stir and add the aminated polysiloxane, warm to 55-60℃, react for 30-40 min, then add triethylamine, acetic anhydride and nickel acetate, warm to 120-140℃, continue to react for 2-3 h to obtain a modifier;

[0012] Step A3: uniformly mix polyethylene and dimethylbenzene, protect with argon, under the conditions of 120-150 r / min rotation speed and 135-140℃ temperature, stir for 1-1.5 h, then add dicumyl peroxide and the modifier, react for 2-4 h to obtain a modified polyethylene, mix the modified polyethylene, 2,3-dihydroxypropyl acrylate and acetylacetone platinum, melt and mix for 5-10 min under the conditions of 300-500 r / min rotation speed and 160-170℃ temperature to obtain a functionalized polyethylene.

[0013] Further, the molar ratio of p-nitrostyrene to trichlorosilane in step A1 is 1:1, the amount of chloroplatinic acid is 1 ‰ of the mass of trichlorosilane, and the molar ratio of lithium dimethylhydrosilanol, tetramethyltetraphenylcyclotetrasiloxane and Si-Cl bond on the intermediate is 1:2.5:1.

[0014] Further, the amount of palladium-carbon catalyst in step A2 is 5% of the mass of the pretreated polysiloxane, and the amount ratio of maleic anhydride, amino group on the aminated polysiloxane, triethylamine, acetic anhydride and nickel acetate is 56 mmol:28 mmol:5 mL:12 mL:3.5 g.

[0015] Further, the mass ratio of polyethylene, dimethylbenzene, dicumyl peroxide and the modifier in step A3 is 100:150:1.4:6, and the mass ratio of the modified polyethylene, 2,3-dihydroxypropyl acrylate and acetylacetone platinum is 100:15:0.01.

[0016] Further, the modified filler is prepared by the following steps:

[0017] Step B1: dispersing graphene oxide in ethanol, stirring and adding deionized water and 3-(methacryloyloxy) propyl trimethoxysilane under the conditions of 300-500 r / min rotation speed, 55-60 DEG C temperature and pH value of 4-5, and reacting for 2-3 h to prepare pretreated graphene;

[0018] Step B2: uniformly mixing pretreated graphene, 1-thioglycerol, 2-hydroxy-2-methyl phenyl propionone, toluene and ethanol, and reacting for 1-1.5 h under the conditions of 20-25 DEG C temperature and 365 nm ultraviolet light irradiation to prepare the modified filler.

[0019] Further, the amount of 3-(methacryloyloxy) propyl trimethoxysilane in step B1 is 3-5% of the mass of graphene oxide.

[0020] Further, the molar ratio of the double bond on the pretreated graphene in step B2 to 1-thioglycerol is 1:1, and the amount of 2-hydroxy-2-methyl phenyl propionone is 2% of the mass of 1-thioglycerol.

[0021] The beneficial effects of the present application: the high-temperature-resistant power cable prepared by the present application twists copper wires to form a core, and sequentially coats the core surface with an insulation layer, a shielding layer and a protective layer to prepare the high-temperature-resistant power cable, the protective layer is a reinforced resin, the reinforced resin comprises the following raw materials: functionalized polyethylene, modified filler and 1,4-p-diphenylboric acid bis(pinacol) ester, the functionalized polyethylene is prepared by reacting p-nitrostyrene and trichlorosilane, so that the double bond on the p-nitrostyrene reacts with the Si-H bond on the trichlorosilane to prepare an intermediate, dimethyl hydrogen silanol lithium is used as an initiator, tetramethyl tetraphenyl cyclosiloxane is used as a polymerization monomer, and the intermediate is added, so that the Si-Cl bond on the intermediate reacts with the silanol lithium to prepare pretreated polysiloxane, the pretreated polysiloxane is reduced by a palladium-carbon catalyst and hydrogen, so that the nitro group on the pretreated polysiloxane is converted into an amino group to prepare aminated polysiloxane, the aminated polysiloxane is reacted with maleic anhydride to form a maleimide structure to prepare a modifier, the polyethylene and the modifier are reacted under the action of dicumyl peroxide, so that the double bond on the modifier is directly on the polyethylene molecular chain to prepare modified polyethylene, and the modified polyethylene and 2,3-dihydroxy propyl acrylate are reacted under the action of acetylacetone platinum, so that the Si-H bond on the modified polyethylene reacts with the double bond on the 2,3-dihydroxy propyl acrylate to prepare functionalized polyethylene.

[0022] The modified filler is prepared by treating graphene oxide with 3-(methacryloyloxy)propyl trimethoxysilane to graft double bonds on the surface of the graphene oxide, and then reacting the pretreated graphene oxide with 1-thioglycerol to react the double bonds on the pretreated graphene oxide with the mercapto groups on the 1-thioglycerol.

[0023] When the functionalized polyethylene, p-toluenesulfonic acid and 1,4-p-diphenylboronic acid bis(pinacol) ester are melt-stirred, the diol groups on the functionalized polyethylene can form borate ester structures with the 1,4-p-diphenylboronic acid bis(pinacol) ester, and adjacent diol groups on the functionalized polyethylene form borate ester self-crosslinking, and then the modified filler is added to form crosslinking between the functionalized polyethylene molecules and the modified filler, forming an organic-inorganic interpenetrating network, and the modified filler can form a thermal barrier network in the entire matrix, effectively hindering the thermal motion of the polyethylene molecular chain, and at the same time, the side chain of the functionalized polyethylene molecular chain contains a phenyl polysiloxane structure, which can increase the flexibility of the polyethylene segment, and cooperate with the formation of dynamic crosslinking to greatly improve the high temperature resistance of the material. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] Embodiment 1, a method for preparing a high-temperature-resistant power cable, specifically comprising the following steps:

[0026] The copper wires are twisted to form a core, and an insulating layer, a shielding layer and a protective layer are successively coated on the surface of the core to prepare a high-temperature-resistant power cable.

[0027] The shielding layer is polyvinyl chloride, the shielding layer is a copper wire metal shielding tape, and the protective layer is a reinforced resin.

[0028] The reinforced resin comprises the following raw materials by weight: 100 parts of functionalized polyethylene, 20 parts of modified filler, 0.5 parts of p-toluenesulfonic acid and 10 parts of 1,4-p-diphenylboronic acid bis(pinacol) ester. The functionalized polyethylene, p-toluenesulfonic acid and 1,4-p-diphenylboronic acid bis(pinacol) ester are added to a mixing machine, and under the conditions of a rotation speed of 150 r / min and a temperature of 160℃, they are melt-stirred for 5 min, then the modified filler is added, and stirring is continued for 10 min to prepare the reinforced resin.

[0029] The functionalized polyethylene is prepared by the following steps:

[0030] Step A1: uniformly mix p-nitrostyrene, trichlorosilane, chloroplatinic acid and tetrahydrofuran, protect by nitrogen, under the conditions of 150 r / min rotation speed and 50℃ temperature, react for 5h to obtain an intermediate, mix lithium dimethylhydrosilanol and tetrahydrofuran, protect by nitrogen, under the conditions of 200 r / min rotation speed and 0℃ temperature, stir and add tetramethyltetraphenylcyclotetrasiloxane, warm up to 25℃, react for 8h, add the intermediate, continue to react for 1h to obtain a pretreated polysiloxane;

[0031] Step A2: uniformly mix the pretreated polysiloxane, palladium-carbon catalyst and DMF, protect by hydrogen, under the conditions of 300 r / min rotation speed, 75℃ temperature and 1MPa pressure, react for 4h to obtain an aminated polysiloxane, mix maleic anhydride and DMF, under the conditions of 200 r / min rotation speed and 5℃ temperature, stir and add the aminated polysiloxane, warm up to 55℃, react for 30min, then add triethylamine, acetic anhydride and nickel acetate, warm up to 120℃, continue to react for 2h to obtain a modifier;

[0032] Step A3: uniformly mix polyethylene and dimethylbenzene, protect by argon, under the conditions of 120 r / min rotation speed and 135℃ temperature, stir for 1h, then add dicumyl peroxide and the modifier, react for 2h to obtain a modified polyethylene, mix the modified polyethylene, 2,3-dihydroxypropyl acrylate and acetylacetone platinum, melt and mix for 5min under the conditions of 300 r / min rotation speed and 160℃ temperature to obtain a functionalized polyethylene.

[0033] The molar ratio of p-nitrostyrene to trichlorosilane in Step A1 is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of trichlorosilane, and the molar ratio of lithium dimethylhydrosilanol, tetramethyltetraphenylcyclotetrasiloxane and Si-Cl bond on the intermediate is 1:2.5:1.

[0034] The amount of palladium-carbon catalyst in Step A2 is 5% of the mass of the pretreated polysiloxane, and the amount ratio of maleic anhydride, amino group on the aminated polysiloxane, triethylamine, acetic anhydride and nickel acetate is 56mmol:28mmol:5mL:12mL:3.5g.

[0035] The mass ratio of polyethylene, dimethylbenzene, dicumyl peroxide and the modifier in Step A3 is 100:150:1.4:6, the polyethylene is low-density polyethylene MI=1.5g / 10min, and the mass ratio of the modified polyethylene, 2,3-dihydroxypropyl acrylate and acetylacetone platinum is 100:15:0.01.

[0036] The modified filler is prepared by the following steps:

[0037] Step B1: dispersing graphene oxide in ethanol, stirring and adding deionized water and 3-(methacryloyloxy) propyl trimethoxysilane under the conditions of 300 r / min rotation speed, 55℃ temperature and pH value of 4, and reacting for 2 h to obtain pretreated graphene;

[0038] Step B2: uniformly mixing pretreated graphene, 1-thioglycerol, 2-hydroxy-2-methylphenyl propionone, toluene and ethanol, and reacting for 1 h under the conditions of 20℃ temperature and 365 nm ultraviolet light irradiation to obtain a modified filler.

[0039] The amount of 3-(methacryloyloxy) propyl trimethoxysilane in step B1 is 3% of the mass of graphene oxide.

[0040] The molar ratio of double bonds on the pretreated graphene in step B2 to 1-thioglycerol is 1:1, and the amount of 2-hydroxy-2-methylphenyl propionone is 2% of the mass of 1-thioglycerol.

[0041] Embodiment 2, a method for preparing a high-temperature-resistant power cable, specifically comprising the following steps:

[0042] Twisting copper wires to form a core, and sequentially coating an insulation layer, a shielding layer and a protective layer on the surface of the core to obtain a high-temperature-resistant power cable;

[0043] The shielding layer is polyvinyl chloride, the shielding layer is a copper wire metal shielding tape, and the protective layer is a reinforced resin.

[0044] The reinforced resin comprises the following raw materials by weight: functionalized polyethylene 110 parts, modified filler 25 parts, p-toluenesulfonic acid 0.6 parts and 1,4-p-diphenylboric acid bis(pinacol) ester 13 parts. The functionalized polyethylene, p-toluenesulfonic acid and 1,4-p-diphenylboric acid bis(pinacol) ester are added to a mixing machine, and after melting and stirring for 8 min under the conditions of 150 r / min rotation speed and 165℃ temperature, the modified filler is added and continues to stir for 13 min to obtain the reinforced resin.

[0045] The functionalized polyethylene is prepared by the following steps:

[0046] Step A1: uniformly mixing p-nitrostyrene, trichlorosilane, chloroplatinic acid and tetrahydrofuran, and protecting under nitrogen atmosphere, and reacting for 6 h under the conditions of 150 r / min rotation speed and 55℃ temperature to obtain an intermediate. Mixing lithium dimethylhydrogen silanol and tetrahydrofuran, and protecting under nitrogen atmosphere, and stirring under the conditions of 200 r / min rotation speed and 0℃ temperature, and adding tetramethyltetraphenylcyclotetrasiloxane after warming to 30℃, and reacting for 9 h, and adding the intermediate and continuing to react for 1 h to obtain pretreated polysiloxane.

[0047] Step A2: the pretreated polysiloxane, palladium-carbon catalyst and DMF were mixed uniformly, hydrogen was introduced, and the reaction was carried out at a rotation speed of 300 r / min, a temperature of 80℃ and a pressure of 1.5 MPa for 5 h to obtain aminosilicone. Maleic anhydride and DMF were mixed, and the aminosilicone was added under stirring at a rotation speed of 200 r / min and a temperature of 8℃. The temperature was raised to 55℃, and the reaction was carried out for 35 min. Then, triethylamine, acetic anhydride and nickel acetate were added, the temperature was raised to 130℃, and the reaction was carried out for another 3 h to obtain a modifier;

[0048] Step A3: polyethylene and xylene were mixed uniformly, and argon was introduced. After stirring at a rotation speed of 120 r / min and a temperature of 140℃ for 1 h, dicumyl peroxide and the modifier were added, and the reaction was carried out for 3 h to obtain modified polyethylene. The modified polyethylene, 2,3-dihydroxypropyl acrylate and platinum acetylacetonate were mixed, and melt-kneading was carried out at a rotation speed of 300 r / min and a temperature of 170℃ for 8 min to obtain functionalized polyethylene.

[0049] The molar ratio of p-nitrostyrene to trichlorosilane in step A1 was 1:1, the amount of chloroplatinic acid was 1 ‰ of the mass of trichlorosilane, and the molar ratio of dimethylhydrogen silanol lithium, tetramethyltetraphenylcyclotetrasiloxane and Si-Cl bond on the intermediate was 1:2.5:1.

[0050] The amount of palladium-carbon catalyst in step A2 was 5% of the mass of the pretreated polysiloxane, and the amount ratio of maleic anhydride, amino group on aminosilicone, triethylamine, acetic anhydride and nickel acetate was 56 mmol:28 mmol:5 mL:12 mL:3.5 g.

[0051] The mass ratio of polyethylene, xylene, dicumyl peroxide and modifier in step A3 was 100:150:1.4:6, the polyethylene was low-density polyethylene MI = 1.5 g / 10 min, and the mass ratio of modified polyethylene, 2,3-dihydroxypropyl acrylate and platinum acetylacetonate was 100:15:0.01.

[0052] The modified filler was prepared by the following steps:

[0053] Step B1: graphene oxide was dispersed in ethanol, and deionized water and 3-(methacryloyloxy)propyltrimethoxysilane were added under stirring at a rotation speed of 300 r / min, a temperature of 60℃ and a pH value of 4. The reaction was carried out for 3 h to obtain pretreated graphene;

[0054] Step B2: the pretreated graphene, 1-thio glycerol, 2-hydroxy-2-methyl phenyl propionone, toluene and ethanol were mixed uniformly, and the reaction was carried out under the condition of 20℃ and 365nm ultraviolet light irradiation for 1.5h to prepare the modified filler.

[0055] The amount of 3-(methacryloyloxy) propyl trimethoxysilane in step B1 is 4% of the mass of graphene oxide.

[0056] The molar ratio of the double bond on the pretreated graphene in step B2 to 1-thio glycerol is 1:1, and the amount of 2-hydroxy-2-methyl phenyl propionone is 2% of the mass of 1-thio glycerol.

[0057] Embodiment 3, a method for preparing a high-temperature-resistant power cable, specifically comprising the following steps:

[0058] The copper wire is twisted to form a core, and the insulating layer, the shielding layer and the protective layer are coated on the surface of the core in sequence to prepare the high-temperature-resistant power cable.

[0059] The shielding layer is polyvinyl chloride, the shielding layer is a copper wire metal shielding belt, and the protective layer is a reinforced resin.

[0060] The reinforced resin comprises the following raw materials by weight: functionalized polyethylene 120 parts, modified filler 30 parts, p-toluenesulfonic acid 0.8 parts and 1,4-p-diphenylboric acid bis(pinacol) ester 15 parts. The functionalized polyethylene, p-toluenesulfonic acid and 1,4-p-diphenylboric acid bis(pinacol) ester are added to a mixing machine, and after melting and stirring for 10min under the condition of a rotation speed of 200r / min and a temperature of 170℃, the modified filler is added and continues to stir for 15min to prepare the reinforced resin.

[0061] The functionalized polyethylene is prepared by the following steps:

[0062] Step A1: p-nitrostyrene, trichlorosilane, chloroplatinic acid and tetrahydrofuran are mixed uniformly, and nitrogen protection is carried out under the condition of a rotation speed of 200r / min and a temperature of 60℃ for 7h to prepare an intermediate. Dimethyl hydrogen silanol lithium and tetrahydrofuran are mixed, and nitrogen protection is carried out under the condition of a rotation speed of 300r / min and a temperature of 0℃ for stirring and adding tetramethyl tetraphenyl cyclosiloxane, and the temperature is raised to 30℃ for 10h. The intermediate is added and continues to react for 1.5h to prepare a pretreated polysiloxane.

[0063] Step A2: the pretreated polysiloxane, palladium-carbon catalyst and DMF were mixed uniformly, hydrogen was introduced, and the reaction was carried out at a rotation speed of 500 r / min, a temperature of 80℃ and a pressure of 2 MPa for 6 h to obtain aminosilicone; maleic anhydride and DMF were mixed, and the aminosilicone was added under stirring at a rotation speed of 300 r / min and a temperature of 10℃, and then the temperature was raised to 60℃, and the reaction was carried out for 40 min, and then triethylamine, acetic anhydride and nickel acetate were added, and the temperature was raised to 140℃, and the reaction was carried out for another 3 h to obtain a modifier;

[0064] Step A3: polyethylene and xylene were mixed uniformly, and argon was introduced for protection, and then stirring was carried out at a rotation speed of 150 r / min and a temperature of 140℃ for 1.5 h, and then dicumyl peroxide and the modifier were added, and the reaction was carried out for 4 h to obtain modified polyethylene, and then the modified polyethylene, 2,3-dihydroxypropyl acrylate and platinum acetylacetonate were mixed, and melt kneading was carried out at a rotation speed of 500 r / min and a temperature of 170℃ for 10 min to obtain functionalized polyethylene.

[0065] The molar ratio of p-nitrostyrene to trichlorosilane in step A1 was 1:1, the amount of chloroplatinic acid was 1 ‰ of the mass of trichlorosilane, and the molar ratio of dimethylhydrogen silanol lithium, tetramethyltetraphenylcyclotetrasiloxane and Si-Cl bond on the intermediate was 1:2.5:1.

[0066] The amount of palladium-carbon catalyst in step A2 was 5% of the mass of the pretreated polysiloxane, and the amount ratio of maleic anhydride, amino group on aminosilicone, triethylamine, acetic anhydride and nickel acetate was 56 mmol:28 mmol:5 mL:12 mL:3.5 g.

[0067] The mass ratio of polyethylene, xylene, dicumyl peroxide and the modifier in step A3 was 100:150:1.4:6, the polyethylene was low-density polyethylene MI=1.5 g / 10 min, and the mass ratio of the modified polyethylene, 2,3-dihydroxypropyl acrylate and platinum acetylacetonate was 100:15:0.01.

[0068] The modified filler was prepared by the following steps:

[0069] Step B1: graphene oxide was dispersed in ethanol, and then deionized water and 3-(methacryloyloxy)propyltrimethoxysilane were added under stirring at a rotation speed of 500 r / min, a temperature of 60℃ and a pH value of 5, and the reaction was carried out for 3 h to obtain pretreated graphene;

[0070] Step B2: The pretreated graphene, 1-thioglycerol, 2-hydroxy-2-methylphenyl propionone, toluene and ethanol were mixed uniformly, and the reaction was carried out under the condition of irradiation of ultraviolet light at 25℃ and 365nm for 1.5h to obtain the modified filler.

[0071] The amount of 3-(methacryloyloxy)propyl trimethoxysilane in step B1 was 5% of the mass of graphene oxide.

[0072] The molar ratio of the double bond on the pretreated graphene in step B2 to 1-thioglycerol was 1:1, and the amount of 2-hydroxy-2-methylphenyl propionone was 2% of the mass of 1-thioglycerol.

[0073] Comparative Example 1: In this comparative example, graphene oxide was used instead of the modified filler compared with Example 1, and the remaining steps were the same.

[0074] Comparative Example 2: In this comparative example, lithium trimethylsilanolate was used instead of lithium dimethylsilanolate compared with Example 1, and the remaining steps were the same.

[0075] Comparative Example 3: In this comparative example, dimethylchlorosilane was used instead of trichlorosilane compared with Example 1, and the remaining steps were the same.

[0076] The reinforced resins prepared in Examples 1-3 and Comparative Examples 1-3 were made into standard dumbbell-shaped tensile samples with a thickness of 2mm, and the tensile strength at room temperature was detected under the condition of a tensile rate of 10mm / min and a gauge length of 20mm. The tensile strength was detected after heat treatment at 110℃ for 24h, 48h and 168h, respectively, and the tensile strength retention rate was calculated. The detection results are shown in Table 1.

[0077] Table 1

[0078]

[0079] As can be seen from Table 1, the present application has good high-temperature resistance effect.

[0080] The above content is only an example and description of the concept of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the concept of the present application or exceed the scope defined by the present claims, and they should belong to the protection scope of the present application.

Claims

1. A method for preparing a high-temperature resistant power cable, characterized in that: Specifically, the steps include the following: High-temperature resistant power cables are made by stranding copper wires to form a core, and then sequentially covering the surface of the core with an insulation layer, a shielding layer, and a protective layer. The insulating layer is made of polyvinyl chloride, the shielding layer is made of copper wire metal shielding tape, and the protective layer is made of reinforced resin. The reinforced resin comprises the following raw materials in parts by weight: 100-120 parts of functionalized polyethylene, 20-30 parts of modified filler, 0.5-0.8 parts of p-toluenesulfonic acid, and 10-15 parts of bis(pinacol) 1,4-diphenylboronic acid. The functionalized polyethylene, p-toluenesulfonic acid, and bis(pinacol) 1,4-diphenylboronic acid are added to a mixer, melted and stirred, and then the modified filler is added. Stirring is continued to obtain the reinforced resin. The functionalized polyethylene is made by the following steps: Step A1: Mix p-nitrostyrene, trichlorosilane, chloroplatinic acid and tetrahydrofuran evenly, purge with nitrogen, and react to obtain an intermediate. Mix lithium dimethylhydrosilyl alcohol and tetrahydrofuran, purge with nitrogen, stir and add tetramethyltetraphenylcyclotetrasiloxane, heat and react, add the intermediate, and continue the reaction to obtain pretreated polysiloxane. Step A2: Mix the pretreated polysiloxane, palladium on carbon catalyst and DMF evenly, introduce hydrogen gas and react to obtain amino-modified polysiloxane. Mix maleic anhydride and DMF, stir and add amino-modified polysiloxane. After heating and reacting, add triethylamine, acetic anhydride and nickel acetate and continue the reaction to obtain the modifier. Step A3: Mix polyethylene and xylene evenly, purge with argon gas, stir, add dicumyl peroxide and modifier, react to obtain modified polyethylene, mix and melt-blend the modified polyethylene, propyl 2,3-dihydroxyacrylate and platinum acetylacetonate to obtain functionalized polyethylene. The modified filler is prepared by the following steps: Step B1: Graphene oxide is dispersed in ethanol, stirred, and deionized water and 3-(methacryloyloxy)propyltrimethoxysilane are added to react and obtain pretreated graphene. Step B2: Mix and react pretreated graphene, 1-thioglycerol, 2-hydroxy-2-methylphenylacetone, toluene and ethanol to obtain the modified filler.

2. The method for preparing a high-temperature resistant power cable according to claim 1, characterized in that: The molar ratio of p-nitrostyrene and trichlorosilane in step A1 is 1:1, and the molar ratio of lithium dimethylhydrosilyl alcohol, tetramethyltetraphenylcyclotetrasiloxane and the Si-Cl bond on the intermediate is 1:2.5:

1.

3. The method for preparing a high-temperature resistant power cable according to claim 1, characterized in that: The amount of palladium catalyst on carbon mentioned in step A2 is 5% of the mass of the pretreated polysiloxane, and the ratio of maleic anhydride, amino group on the aminated polysiloxane, triethylamine, acetic anhydride and nickel acetate is 56 mmol:28 mmol:5 mL:12 mL:3.5 g.

4. The method for preparing a high-temperature resistant power cable according to claim 1, characterized in that: The mass ratio of polyethylene, xylene, dicumyl peroxide and modifier in step A3 is 100:150:1.4:6, and the mass ratio of modified polyethylene, propyl 2,3-dihydroxyacrylate and platinum acetylacetonate is 100:15:0.

01.

5. The method for preparing a high-temperature resistant power cable according to claim 1, characterized in that: The amount of 3-(methacryloyloxy)propyltrimethoxysilane used in step B1 is 3-5% of the mass of graphene oxide.

6. The method for preparing a high-temperature resistant power cable according to claim 1, characterized in that: The molar ratio of the double bonds on the pretreated graphene and 1-thioglycerol in step B2 is 1:

1.

7. A high-temperature resistant power cable, characterized in that: It is prepared according to any one of the preparation methods described in claims 1-6.

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