Heat-resistant anti-aging cable

Abstract

The invention discloses a heat-resistant and anti-aging cable. The preparation process of the heat-resistant and anti-aging cable comprises the following steps: 1, adding polyvinyl chloride, acrylate rubber, stearic acid, titanium dioxide, polyethylene wax and a modifier into a high-speed mixer, blending for 10-12 minutes, discharging, and drying to obtain a mixed raw material; 2, transferring the mixed raw material to a twin-screw extrusion platform for melt blending, and performing extrusion granulation to obtain a material for forming a sheath layer; and 3, sequentially coating the material of the insulating layer and the material of the sheath layer on the conductor to obtain the heat-resistant and anti-aging cable. The cable sheath material has the beneficial effects that the modified filler is prepared and introduced into the cable sheath material, so that the overall heat resistance and aging resistance are effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cables, and particularly relates to a heat-resistant and anti-aging cable. BACKGROUND

[0002] With the rapid development of power transmission and communication technology, the heat-resistant and anti-aging performance of cables in high-temperature environments is increasingly required.

[0003] Traditional cable sheath materials are mostly polyvinyl chloride (PVC) or polyethylene (PE) polymer matrix, which is low in cost and convenient to process, but is prone to oxidative degradation under long-term high-temperature or ultraviolet radiation conditions, resulting in problems such as mechanical property degradation, insulation failure and the like. In the prior art, inorganic fillers (such as silicon dioxide, calcium carbonate) or antioxidants (such as hindered phenols) are usually added to improve heat resistance, but these methods have obvious defects: inorganic fillers have poor compatibility with the polymer matrix and are prone to agglomeration, resulting in uneven mechanical properties of the material; and small-molecule antioxidants are prone to migration and precipitation, and the protective effect significantly decays after long-term use. In addition, conventional modification methods have limited synergistic aging protection effect on high temperature and ultraviolet light, and are difficult to meet the long-term stability requirements under severe working conditions.

[0004] Therefore, in order to solve the above problems, the application provides a heat-resistant and anti-aging cable. SUMMARY

[0005] The application aims to overcome the defects of the prior art and provides a heat-resistant and anti-aging cable.

[0006] The object of the application can be achieved by the following technical solutions. A preparation process of a heat-resistant and anti-aging cable comprises the following steps: Step 1: polyvinyl chloride, acrylate rubber, stearic acid, titanium dioxide, polyethylene wax and modified filler are added to a high-speed mixer and blended for 10-12 min, and then the mixture is dried to obtain a mixed raw material; Step 2: the mixed raw material is transferred to a twin-screw extrusion platform for melt blending, and then extrusion granulation is performed to obtain a material forming a sheath layer; Step 3: the material of the insulation layer and the material of the sheath layer are sequentially coated on the conductor to obtain a heat-resistant and anti-aging cable.

[0007] More preferably, the mixed raw material comprises the following components: 100-120 parts by weight of polyvinyl chloride, 5-8 parts by weight of acrylate rubber, 1-2 parts by weight of stearic acid, 2-4 parts by weight of titanium dioxide, 1-2 parts by weight of polyethylene wax and 10-12 parts by weight of modified filler.

[0008] More preferably, the process parameters of the extrusion granulation are as follows: temperature 170-190 DEG C, screw rotation speed 50-70 rpm.

[0009] More preferably, the preparation process of the modified filler is as follows: A1: Dissolve hexadecyl trimethyl ammonium bromide in deionized water, add ammonia water and stir for 1-2 h, then add tetraethyl orthosilicate dropwise, stir at room temperature for 3-4 h, filter, wash, then transfer to ethanol, add mercaptopropyl trimethoxysilane dropwise, react at room temperature for 24 h, add the obtained product to an acidic ethanol solution, stir at 70-80 °C for 10-12 h, centrifuge after cooling, dry to obtain mercaptosilica; A2: Mix the modifier with acetone, stir uniformly, then add mercaptosilica, stir at room temperature for 10-12 h, then continue to stir under vacuum for 1-2 h, wash with deionized water after centrifugation, dry to obtain the modified filler.

[0010] More preferably, the raw materials for the mercaptosilica include the following: 25-30 parts by weight of hexadecyl trimethyl ammonium bromide, 100-120 parts by weight of deionized water, 50-80 parts by weight of ammonia water, 100-120 parts by weight of tetraethyl orthosilicate, 120-160 parts by weight of ethanol, 60-80 parts by weight of mercaptopropyl trimethoxysilane, and 300-350 parts by weight of an acidic ethanol solution; wherein the concentration of the ammonia water is 25 wt%; the acidic ethanol solution is composed of ethanol and hydrochloric acid, and the volume ratio of the two is 9:1, and the concentration of the hydrochloric acid is 37 wt%.

[0011] More preferably, the raw materials for the modified filler include the following: 50-60 parts by weight of the modifier, 250-300 parts by weight of acetone, and 100-120 parts by weight of mercaptosilica.

[0012] More preferably, the preparation process of the modifier is as follows: S1: Mix 3,5-bis(tert-butyl)-4-hydroxybenzene propionyl chloride with dichloromethane, add 3-bromo-1-propanol and triethylamine, react at 20-30 °C for 6-8 h, wash the reaction solution with water, dry the organic phase with anhydrous magnesium sulfate, remove the solvent by rotary evaporation, purify to obtain intermediate A; S2: Dissolve 2,4-dihydroxybenzophenone in tetrahydrofuran, add tetraethylammonium bromide, stir uniformly, slowly add 1,3-dioxolane-2-one at room temperature, after the addition is completed, increase the temperature to 70-80 °C, reflux for 2-3 h, cool to room temperature after the reaction is completed, evaporate the solvent under reduced pressure, dry, filter, concentrate, purify to obtain intermediate B; S3: Add intermediate A, intermediate B, and calcium carbonate to acetone, stir uniformly, increase the temperature to 30-40 °C, react for 3-4 h, remove the acetone by rotary evaporation, wash, dry, purify to obtain the modifier.

[0013] In the scheme, 3,5-bis(tert-butyl)-4-hydroxybenzene propionyl chloride (acyl chloride) and 3-bromo-1-propanol (hydroxyl-containing brominated alcohol) undergo nucleophilic substitution, and the specific reaction process is as follows: More preferably, the raw materials in the intermediate A include the following components: 10-12 parts of 3,5-bis(tert-butyl)-4-hydroxybenzene propionyl chloride, 50-60 parts of dichloromethane, 6-7 parts of 3-bromo-1-propanol, and 4-5 parts of triethylamine.

[0014] In the scheme, 2,4-dihydroxybenzophenone (phenolic hydroxyl) and 1,3-dioxolane-2-ketone (cyclic carbonate) react in tetrahydrofuran, and tetraethylammonium bromide is used as a phase transfer catalyst to promote the attack of the nucleophile (phenolic hydroxyl) on the carbonyl carbon of the cyclic carbonate, leading to ring opening, and the specific reaction process is as follows: More preferably, the raw materials in the intermediate B include the following components: 10-12 parts of 2,4-dihydroxybenzophenone, 60-80 parts of tetrahydrofuran, 0.5-1 parts of tetraethylammonium bromide, and 5-6 parts of 1,3-dioxolane-2-ketone.

[0015] In the scheme, the brominated propyl group in intermediate A and the phenolic hydroxyl group in intermediate B undergo nucleophilic substitution in acetone, and the specific reaction process is as follows: More preferably, the modifier includes the following components: 10-12 parts of intermediate A, 7-8 parts of intermediate B, 3-4 parts of calcium carbonate, and 40-60 parts of acetone.

[0016] The beneficial effects of the present application are as follows: The present application effectively improves the overall heat resistance and aging resistance by preparing a modified filler and introducing it into the sheath material of the cable. Firstly, in the scheme, the obtained mercaptosilica is a mesoporous nanorod, and when the modifier is dissolved in acetone together with the mercaptosilica, the modifier can be loaded in the mesoporous channels of the silica by van der Waals force and capillary action in the channels, which can effectively prevent the migration of the prepared modifier; at the same time, the mercapto groups on the surface of the nanorod can form physical crosslinking or hydrogen bonding with the double bonds in the matrix, improving the compatibility of the filler.

[0017] Secondly, the prepared modifier contains a hindered phenol structure which can effectively capture free radicals and interrupt the oxidative degradation chain reaction of the polymer chain; meanwhile, the conjugated system contained in the structure can absorb ultraviolet light energy and convert it into harmless heat energy, reduce photo-oxidation damage, and improve the anti-aging performance of the material; at the same time, the rigid skeleton of the modified filler matrix silicon dioxide can disperse stress, so that the material still maintains mechanical integrity at high temperature, thereby significantly improving the long-term heat resistance and stability of the cable. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part 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.

[0019] Embodiment one: a preparation process of a heat-resistant and anti-aging cable is as follows: Step 1: 100 parts of polyvinyl chloride, 5 parts of acrylate rubber, 1 part of stearic acid, 2 parts of titanium dioxide, 1 part of polyethylene wax and 10 parts of modified filler are added into a high-speed mixer and blended for 10 min, and then discharged, dried to obtain mixed raw materials; Step 2: the mixed raw materials are transferred to a twin-screw extrusion platform for melt blending, and extruded and granulated (temperature 170℃, screw rotation speed 50rpm) to obtain a material forming a sheath layer; Step 3: the material of the insulation layer and the material of the sheath layer are sequentially coated on the conductor to obtain a heat-resistant and anti-aging cable; The preparation process of the modified filler is as follows: A1: 25 parts of cetyltrimethylammonium bromide are dissolved in 100 parts of deionized water, 50 parts of 25wt% ammonia water are added and stirred for 1h, then 100 parts of tetraethyl orthosilicate are added and stirred at room temperature for 3h, after filtration and washing, the product is transferred to 120 parts of ethanol, 60 parts of mercaptopropyltrimethoxysilane are added, and the reaction is carried out at room temperature for 24h, then the obtained product is added to 300 parts of acidic ethanol solution (consisting of ethanol and hydrochloric acid, the volume ratio of the two is 9:1, and the concentration of hydrochloric acid is 37wt%), and stirred at 70℃ for 10h, after cooling, centrifugal separation and drying, mercaptopropylated silicon dioxide is obtained; A2: 50 parts of the modifier are mixed with 250 parts of acetone, stirred uniformly, then 100 parts of mercaptopropylated silicon dioxide are added, stirred at room temperature for 10h, then continue to stir under vacuum for 1h, after centrifugal separation, washed with deionized water and dried, a modified filler is obtained; The preparation process of the modified filler is as follows: S1: 10 parts of 3,5-bis(tert-butyl)-4-hydroxybenzene propionyl chloride were mixed with 50 parts of dichloromethane, 6 parts of 3-bromo-1-propanol and 4 parts of triethylamine were added, and the reaction was carried out at 20°C for 6h. The reaction solution was washed with water, the organic phase was dried with anhydrous magnesium sulfate, and the solvent was removed by rotary evaporation. After purification, intermediate A was obtained; S2: 10 parts of 2,4-dihydroxybenzophenone were dissolved in 60 parts of tetrahydrofuran, 0.5 parts of tetraethylammonium bromide was added, and stirred uniformly. 5 parts of 1,3-dioxolane-2-one was slowly added dropwise at room temperature. After the addition was completed, the temperature was raised to 70°C, and the reaction was refluxed for 2h. After the reaction was completed, it was cooled to room temperature, the solvent was evaporated under reduced pressure, and after drying, filtering, concentrating and purifying, intermediate B was obtained; S3: 10 parts of intermediate A, 7 parts of intermediate B and 3 parts of calcium carbonate were added to 40 parts of acetone, stirred uniformly, and the temperature was raised to 30°C. The reaction was carried out for 3h. The acetone was removed by rotary evaporation, and after washing, drying and purifying, the modifier was obtained.

[0020] Example two: the preparation process of a heat-resistant and anti-aging cable is as follows: Step 1: 120 parts of polyvinyl chloride, 8 parts of acrylate rubber, 2 parts of stearic acid, 4 parts of titanium dioxide, 2 parts of polyethylene wax and 12 parts of modified filler were added to a high-speed mixer and blended for 12min. After discharging, drying was carried out to obtain a mixed raw material; Step 2: The mixed raw material was transferred to a twin-screw extrusion platform for melt blending, and extrusion granulation was carried out (temperature 190°C, screw rotation speed 70rpm) to obtain a material forming a sheath layer; Step 3: The material of the insulation layer and the material of the sheath layer were successively coated on the conductor to obtain a heat-resistant and anti-aging cable; The preparation process of the modified filler is as follows: A1: 30 parts of hexadecyl trimethyl ammonium bromide was dissolved in 120 parts of deionized water, 80 parts of 25wt% ammonia water was added and stirred for 2h. Then 120 parts of tetraethyl orthosilicate was added dropwise, and stirred at room temperature for 4h. After filtering and washing, it was transferred to 160 parts of ethanol, 80 parts of mercaptopropyl trimethoxysilane was added dropwise, and reacted at room temperature for 24h. The obtained product was added to 350 parts of acidic ethanol solution (consisting of ethanol and hydrochloric acid, the volume ratio of the two is 9:1, and the concentration of hydrochloric acid is 37wt%), and stirred at 80°C for 12h. After cooling, centrifugal separation and drying, mercapto silica was obtained; A2: 60 parts of the modifier was mixed with 300 parts of acetone, and after stirring uniformly, 120 parts of mercapto silica was added. Stirring was carried out at room temperature for 12h, and then under vacuum, stirring was continued for 2h. After centrifugal separation, washing with deionized water and drying, the modified filler was obtained; The preparation process of the modified filler is as follows: S1: 12 parts of 3,5-bis(tert-butyl)-4-hydroxybenzene propionyl chloride were mixed with 60 parts of dichloromethane, 7 parts of 3-bromo-1-propanol and 5 parts of triethylamine were added, and the reaction was carried out at 30°C for 8h. The reaction solution was washed with water, the organic phase was dried over anhydrous magnesium sulfate, and the solvent was removed by rotary evaporation. After purification, intermediate A was obtained. S2: 12 parts of 2,4-dihydroxybenzophenone were dissolved in 80 parts of tetrahydrofuran, 1 part of tetraethylammonium bromide was added, and stirred uniformly. 6 parts of 1,3-dioxolane-2-one was slowly added dropwise at room temperature. After the addition was completed, the temperature was raised to 80°C, and the reaction was refluxed for 3h. After the reaction was completed, the solution was cooled to room temperature and the solvent was evaporated under reduced pressure. After drying, filtering, concentrating and purifying, intermediate B was obtained. S3: 12 parts of intermediate A, 8 parts of intermediate B and 4 parts of calcium carbonate were added to 60 parts of acetone, stirred uniformly, and the temperature was raised to 40°C. The reaction was carried out for 4h. The acetone was removed by rotary evaporation. After washing, drying and purifying, the modifier was obtained.

[0021] Example Three: A preparation process of a heat-resistant and anti-aging cable is as follows: Step 1: 110 parts of polyvinyl chloride, 6.5 parts of acrylate rubber, 1.5 parts of stearic acid, 3 parts of titanium dioxide, 1.5 parts of polyethylene wax and 11 parts of modified filler were added to a high-speed mixer and blended for 11 min. After discharging, the mixed raw materials were dried to obtain a mixed raw material; Step 2: The mixed raw material was transferred to a twin-screw extrusion platform for melt blending, and extrusion granulation was carried out (temperature 180°C, screw rotation speed 60 rpm) to obtain a material for forming a sheath layer; Step 3: The material for the insulation layer and the material for the sheath layer were successively coated on the conductor to obtain a heat-resistant and anti-aging cable; The preparation process of the modified filler is as follows: A1: 27.5 parts of hexadecyl trimethyl ammonium bromide were dissolved in 110 parts of deionized water, 65 parts of 25wt% ammonia water was added and stirred for 1.5h. Then 110 parts of tetraethyl orthosilicate was added dropwise and stirred at room temperature for 3.5h. After filtering and washing, it was transferred to 140 parts of ethanol, 70 parts of mercaptopropyl trimethoxysilane was added dropwise, and the reaction was carried out at room temperature for 24h. The obtained product was added to 325 parts of acidic ethanol solution (consisting of ethanol and hydrochloric acid, the volume ratio of the two is 9:1, and the concentration of hydrochloric acid is 37wt%), and stirred at 75°C for 11h. After cooling, centrifugal separation and drying, mercapto silica was obtained; A2: 55 parts of the modifier were mixed with 275 parts of acetone, stirred uniformly, and then 110 parts of mercapto silica was added. The stirring was carried out at room temperature for 11h, and then the stirring was continued under vacuum for 1.5h. After centrifugal separation, the product was washed with deionized water and dried to obtain the modified filler; The preparation process of the modified filler is as follows: S1: 11 parts of 3,5-bis(tert-butyl)-4-hydroxybenzene propionyl chloride were mixed with 55 parts of dichloromethane, 6.5 parts of 3-bromo-1-propanol and 4.5 parts of triethylamine were added, and the reaction was carried out at 25℃ for 7h. The reaction solution was washed with water, the organic phase was dried with anhydrous magnesium sulfate, the solvent was removed by rotary evaporation, and after purification, intermediate A was obtained; S2: 11 parts of 2,4-dihydroxybenzophenone were dissolved in 70 parts of tetrahydrofuran, 0.75 parts of tetraethylammonium bromide was added, stirred uniformly, 5.5 parts of 1,3-dioxolane-2-one was slowly added dropwise at room temperature, after the dropwise addition was completed, the temperature was raised to 75℃, and the reaction was refluxed for 2.5h. After the reaction was completed, it was cooled to room temperature, the solvent was evaporated under reduced pressure, dried, filtered, concentrated and purified to obtain intermediate B; S3: 11 parts of intermediate A, 7.5 parts of intermediate B and 3.5 parts of calcium carbonate were added to 50 parts of acetone, stirred uniformly, the temperature was raised to 35℃, and the reaction was carried out for 3.5h. The acetone was removed by rotary evaporation, and after washing, drying and purification, the modifier was obtained.

[0022] Comparative Example One: No modified filler was added, and the rest was the same as Example Three, as follows: Step 1: 110 parts of polyvinyl chloride, 6.5 parts of acrylate rubber, 1.5 parts of stearic acid, 3 parts of titanium dioxide, 1.5 parts of polyethylene wax were added to a high-speed mixer and blended for 11 min. After discharging, drying was performed to obtain a mixed raw material; Step 2: The mixed raw material was transferred to a twin-screw extrusion platform for melt blending, and extrusion granulation was performed (temperature 180℃, screw rotation speed 60rpm) to obtain a material forming a sheath layer; Step 3: The material of the insulation layer and the material of the sheath layer were successively coated on the conductor to obtain a heat-resistant and anti-aging cable.

[0023] Comparative Example Two: The modified filler was mercapto-modified silica, and no further modification was performed thereafter. The rest was the same as Example Three, as follows: Step 1: 110 parts of polyvinyl chloride, 6.5 parts of acrylate rubber, 1.5 parts of stearic acid, 3 parts of titanium dioxide, 1.5 parts of polyethylene wax, and 11 parts of mercapto-modified silica were added to a high-speed mixer and blended for 11 min. After discharging, drying was performed to obtain a mixed raw material; Step 2: The mixed raw material was transferred to a twin-screw extrusion platform for melt blending, and extrusion granulation was performed (temperature 180℃, screw rotation speed 60rpm) to obtain a material forming a sheath layer; Step 3: The material of the insulation layer and the material of the sheath layer were successively coated on the conductor to obtain a heat-resistant and anti-aging cable; The preparation process of the mercapto-modified silica is as follows: A1: 27.5 parts of hexadecyltrimethylammonium bromide was dissolved in 110 parts of deionized water, 65 parts of 25wt% ammonia water was added and stirred for 1.5h, then 110 parts of tetraethyl orthosilicate was added dropwise, stirred at room temperature for 3.5h, after filtration and washing, it was transferred to 140 parts of ethanol, 70 parts of mercaptopropyltrimethoxysilane was added dropwise, reacted at room temperature for 24h, the obtained product was added to 325 parts of acidic ethanol solution (consisting of ethanol and hydrochloric acid, the volume ratio of the two is 9:1, the concentration of hydrochloric acid is 37wt%), stirred at 75℃ under reflux for 11h, after cooling, centrifugal separation and drying, mercaptosilica was obtained.

[0024] Detection test: The materials of the sheath layers obtained from the examples and comparative examples were subjected to relevant performance detection, the inspection standards of tensile strength and elongation at break referred to GB / T 1701; aging was the change rate of tensile strength and elongation at break after treatment in an oven at 100℃ for 168h; the obtained data were shown in the following table: Table One Conclusion: The heat resistance and aging resistance of the cable were significantly improved by introducing the modified filler, and the specific performance was that: the change rate of tensile strength of the sheath materials of examples one to three was only 3.2%-3.9% after aging at 100℃ for 168h, and the change rate of elongation at break was as low as 1.5%-1.9%, which was far superior to comparative example one (change rate 17.4% and 18.6%) without adding modified filler and comparative example two (change rate 7.8% and 8.9%) using only mercaptosilica. The modified filler fixed the hindered phenol modifier through the mesoporous structure of mercaptosilica, synergistically inhibited thermal oxidative degradation, and at the same time, the silica skeleton enhanced the mechanical stability, so that the cable maintained excellent mechanical properties and durability at high temperature.

[0025] In the description of the specification, the description of the reference terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0026] The above is only an example and description of the present application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the scope of the invention or exceed the scope defined by the present claims, which shall belong to the protection scope of the present application.

Claims

1. A heat-resistant and anti-aging cable, characterized in that: The manufacturing process of the heat-resistant and anti-aging cable is as follows: Step 1: Add polyvinyl chloride, acrylate rubber, stearic acid, titanium dioxide, polyethylene wax, and modified filler to a high-speed mixer and mix for 10-12 minutes. After discharge, dry to obtain the mixed raw material. Step 2: Transfer the mixed raw materials to a twin-screw extrusion platform for melt blending, extrusion granulation, and obtain the material that forms the sheath layer; Step 3: The insulation material and the sheath material are sequentially wrapped around the conductor to obtain a heat-resistant and anti-aging cable.

2. The heat-resistant and anti-aging cable according to claim 1, characterized in that: The mixed raw materials include the following components by weight: 100-120 parts polyvinyl chloride, 5-8 parts acrylate rubber, 1-2 parts stearic acid, 2-4 parts titanium dioxide, 1-2 parts polyethylene wax, and 10-12 parts modified filler.

3. The heat-resistant and anti-aging cable according to claim 1, characterized in that: The extrusion granulation process parameters are: temperature 170-190℃, screw speed 50-70rpm.

4. The heat-resistant and anti-aging cable according to claim 1, characterized in that: The preparation process of the modified filler is as follows: A1: Dissolve hexadecyltrimethylammonium bromide in deionized water, add ammonia and stir for 1-2 h, then add tetraethyl orthosilicate dropwise, stir at room temperature for 3-4 h, filter, wash, transfer to ethanol, add mercaptopropyltrimethoxysilane dropwise, react at room temperature for 24 h, add the obtained product to acidic ethanol solution, reflux and stir at 70-80℃ for 10-12 h, cool, centrifuge, and dry to obtain mercaptolated silica; A2: Mix the modifier with acetone, stir evenly, add mercapto-modified silica, stir at room temperature for 10-12 hours, then continue stirring under vacuum for 1-2 hours, centrifuge, wash with deionized water, and dry to obtain the modified filler.

5. The heat-resistant and anti-aging cable according to claim 4, characterized in that: The raw materials in the mercapto-modified silica include the following substances: by weight, 25-30 parts hexadecyltrimethylammonium bromide, 100-120 parts deionized water, 50-80 parts ammonia, 100-120 parts tetraethyl orthosilicate, 120-160 parts ethanol, 60-80 parts mercaptopropyltrimethoxysilane, and 300-350 parts acidic ethanol solution; wherein, the concentration of ammonia is 25 wt%; the acidic ethanol solution is composed of ethanol and hydrochloric acid in a volume ratio of 9:1, and the concentration of hydrochloric acid is 37 wt%.

6. The heat-resistant and anti-aging cable according to claim 4, characterized in that: The modified filler contains the following components by weight: 50-60 parts modifier, 250-300 parts acetone, and 100-120 parts mercapto-modified silica.

7. The heat-resistant and anti-aging cable according to claim 4, characterized in that: The preparation process of the modifier is as follows: S1: 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride was mixed with dichloromethane, and 3-bromo-1-propanol and triethylamine were added. The mixture was reacted at 20-30℃ for 6-8 h. The reaction solution was washed with water, the organic phase was dried with anhydrous magnesium sulfate, the solvent was removed by rotary evaporation, and after purification, intermediate A was obtained. S2: Dissolve 2,4-dihydroxybenzophenone in tetrahydrofuran, add tetraethylammonium bromide, stir well, and slowly add 1,3-dioxolane-2-one dropwise at room temperature. After the addition is complete, raise the temperature to 70-80℃ and reflux for 2-3 hours. After the reaction is complete, cool to room temperature, evaporate the solvent under reduced pressure, dry, filter, concentrate, and purify to obtain intermediate B. S3: Add intermediate A, intermediate B, and calcium carbonate to acetone, stir until homogeneous, raise the temperature to 30-40℃, react for 3-4 hours, remove acetone by rotary evaporation, and obtain the modifier after washing, drying, and purification.

8. The heat-resistant and anti-aging cable according to claim 7, characterized in that: The raw materials in intermediate A include the following components: by weight, 10-12 parts of 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride, 50-60 parts of dichloromethane, 6-7 parts of 3-bromo-1-propanol, and 4-5 parts of triethylamine.

9. A heat-resistant and anti-aging cable according to claim 7, characterized in that: The intermediate B raw material includes the following components: by weight, 10-12 parts of 2,4-dihydroxybenzophenone, 60-80 parts of tetrahydrofuran, 0.5-1 part of tetraethylammonium bromide, and 5-6 parts of 1,3-dioxolane-2-one.

10. A heat-resistant and anti-aging cable according to claim 7, characterized in that: The modifier comprises the following components by weight: 10-12 parts intermediate A, 7-8 parts intermediate B, 3-4 parts calcium carbonate, and 40-60 parts acetone.

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