A weather-resistant low-voltage cable and a method for preparing the same

Abstract

The present invention relates to the field of cable technology, and proposes a weather-resistant low-voltage cable and a preparation method thereof. The low-voltage cable includes a core, an insulating layer and a protective layer from the inside to the outside, and the raw materials of the protective layer include the following components by weight: 60 parts of polyvinyl chloride resin, 15-20 parts of ethylene propylene rubber, 8-12 parts of polyhexanediol adipate, 10-18 parts of ethylene-vinyl acetate copolymer, 20-35 parts of filler, 30-38 parts of flame retardant, 1-4 parts of the first plasticizer, 1-3 parts of the first antioxidant, and 2-4 parts of the first compatibilizer; the filler is serpentine loaded with nanocellulose. Through the above technical scheme, the problems of poor corrosion resistance, poor thermal stability and poor mechanical properties of the low-voltage cable protective layer in the related art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a weather-resistant low-voltage cable and a preparation method thereof. Background Art

[0002] Low-voltage cable refers to power cables with a rated voltage of 1kV or less. It is mainly used to transmit and distribute electrical energy, and to deliver electrical energy from power sources to various low-voltage electrical equipment, such as household appliances, small factory equipment, etc. It is widely used in the fields of electrical wiring in buildings, power and lighting systems in industrial plants, etc. Low-voltage cables are usually composed of a core, an insulation layer and a protective layer. They have the characteristics of simple structure, easy use, safety and reliability, and are suitable for power transmission under various environmental conditions indoors and outdoors. The core of a low-voltage cable is generally made of metal materials such as copper or aluminum and is used to conduct current. The insulation layer is wrapped around the outside of the core to play the role of insulation protection and prevent current leakage. The protective layer is a protective structure outside the insulation layer, usually made of EPDM rubber or polyvinyl chloride resin. Although the protective layer of a low-voltage cable formed by EPDM rubber or polyvinyl chloride resin has a certain weather resistance, it is also exposed to the external environment for a long time, and has poor corrosion resistance and poor thermal stability, which will indirectly reduce the mechanical properties of the protective layer of the low-voltage cable. Therefore, improving the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The invention provides a weather-resistant low-voltage cable and a preparation method thereof, which solves the problems of poor corrosion resistance, poor thermal stability and poor mechanical properties of a low-voltage cable protective layer in the related art.

[0004] The technical solution of the present invention is as follows:

[0005] The present invention provides a weather-resistant low-voltage cable, which comprises a core, an insulating layer and a protective layer from the inside to the outside, wherein the raw materials of the protective layer include the following components in parts by weight:

[0006] 60 parts of polyvinyl chloride resin, 15-20 parts of ethylene propylene rubber, 8-12 parts of polyhexanediol adipate, 10-18 parts of ethylene-vinyl acetate copolymer, 20-35 parts of filler, 30-38 parts of flame retardant, 1-4 parts of first plasticizer, 1-3 parts of first antioxidant, 2-4 parts of first compatibilizer;

[0007] The filler is serpentine loaded with nanocellulose.

[0008] As a further technical solution, the raw material of the serpentine loaded with nanocellulose includes serpentine and nanocellulose.

[0009] As a further technical solution, the weight ratio of the serpentine to the nanocellulose is 4-19:1.

[0010] When the weight ratio of serpentine to nanocellulose is 4~19:1, the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer can be further improved.

[0011] As a further technical solution, the preparation method of the nanocellulose-loaded serpentine comprises the following steps: uniformly dispersing the nanocellulose and the serpentine in anhydrous ethanol, stirring, and drying to obtain the nanocellulose-loaded serpentine.

[0012] As a further technical solution, the particle size of the serpentine is 40-70 μm.

[0013] As a further technical solution, during the stirring, the stirring speed is 600-700 r / min, and the stirring time is 2-3 h; during the drying, the temperature is 105-115° C.

[0014] As a further technical solution, the nanocellulose-loaded serpentine is a modified nanocellulose-loaded serpentine, and the raw materials of the modified nanocellulose-loaded serpentine include stearic acid amide compounds and nanocellulose-loaded serpentine.

[0015] Modification of serpentine loaded with nanocellulose by stearic acid amide compounds can further improve the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer. The reason may be that the addition of stearic acid amide compounds can make the filler more evenly dispersed in the low-voltage cable protective layer material, thereby further promoting the interaction between serpentine loaded with nanocellulose and various organic materials in the protective layer, thereby further improving the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer.

[0016] As a further technical solution, the preparation method of the modified serpentine loaded with nanocellulose includes the following steps: dissolving the stearic acid amide compound in toluene to obtain a stearic acid amide compound solution, adding the serpentine loaded with nanocellulose to the stearic acid amide compound solution, dispersing evenly, concentrating, and drying to obtain the modified serpentine loaded with nanocellulose.

[0017] As a further technical solution, the mass fraction of the stearic acid amide compound solution is 5% to 9%.

[0018] As a further technical solution, the weight ratio of the serpentine loaded with nanocellulose to the stearic acid amide compound is 4-14:1.

[0019] When the weight ratio of serpentine loaded with nanocellulose and stearic acid amide compounds is 4-14:1, the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer can be further improved.

[0020] As a further technical solution, the stearic acid amide compound includes one or two of ethylene bisstearic acid amide and hydroxystearic acid amide.

[0021] As a further technical solution, the raw materials of the insulating layer include the following components in parts by weight:

[0022] 80 parts of polyethylene, 20-30 parts of EPDM rubber, 20-25 parts of ethylene-vinyl acetate copolymer, 1-5 parts of a second plasticizer, 1-3 parts of a second antioxidant, and 3-6 parts of a second compatibilizer.

[0023] As a further technical solution, the material of the wire core is one of copper alloy or aluminum alloy.

[0024] As a further technical solution, the flame retardant is one or both of magnesium hydroxide and aluminum hydroxide.

[0025] As a further technical solution, the first plasticizer and the second plasticizer are independently one or more of diisononyl phthalate, dioctyl phthalate, and chlorinated paraffin.

[0026] As a further technical solution, the first antioxidant and the second antioxidant are independently one or more of antioxidant 1010, antioxidant 1035, and antioxidant K300.

[0027] As a further technical solution, the first compatibilizer and the second compatibilizer are each independently maleic anhydride grafted polyethylene, and the model of the maleic anhydride grafted polyethylene can be selected from one of ZJ-800E, AT2487E, and TY1057H.

[0028] The present invention also provides a method for preparing the weather-resistant low-voltage cable, comprising the following steps:

[0029] S1, blending and extruding the components of the protective layer in parts by weight to obtain a protective layer material;

[0030] S2, blending the components of the insulating layer in parts by weight, and extruding the mixture to the outer periphery of the wire core to obtain a wire core coated with an insulating layer;

[0031] S3, coating the protective layer material on the outer periphery of the wire core coated with the insulating layer to obtain a low-voltage cable.

[0032] As a further technical solution, in step S1, the temperature during extrusion is 140-160°C.

[0033] As a further technical solution, in step S2, the temperature during extrusion is 150-170°C.

[0034] The working principle and beneficial effects of the present invention are:

[0035] In the present invention, the protective layer uses polyvinyl chloride resin as a matrix material, and ethylene propylene diene monomer rubber, polyhexamethylene adipate and ethylene-vinyl acetate copolymer are added. Under the joint action of these components and the use of fillers, the low-voltage cable protective layer can have a tight and stable internal structure, so that the low-voltage cable protective layer has good corrosion resistance, good thermal stability and good mechanical properties. Among them, the filler is serpentine loaded with nanocellulose. By loading nanocellulose on serpentine, the agglomeration of serpentine in organic materials can be reduced, and the interface interaction between serpentine and various organic components in the protective layer can also be strengthened, thereby improving the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the following embodiments and comparative examples, the model of polyvinyl chloride resin is TY-800; the model of EPDM rubber is IP 4640 L; the model of polyhexanediol adipate is XCP-1000H; the model of ethylene-vinyl acetate copolymer is UE647-04; the model of nanocellulose is llb75354; the particle size of serpentine is 45 μm; the model of maleic anhydride grafted polyethylene is ZJ-800E; the wire core is aluminum alloy, model AA8030; and the model of polyethylene is U-PE350.

[0038] Example 1

[0039] A weather-resistant low-voltage cable comprises a core, an insulating layer and a protective layer from the inside to the outside, wherein the raw materials of the protective layer comprise the following components in parts by weight:

[0040] 60 parts of polyvinyl chloride resin, 15 parts of ethylene propylene rubber, 8 parts of poly(hexanediol adipate), 10 parts of ethylene-vinyl acetate copolymer, 20 parts of filler, 30 parts of magnesium hydroxide, 1 part of dioctyl phthalate, 1 part of antioxidant 1035, 2 parts of maleic anhydride grafted polyethylene;

[0041] The filler is serpentine loaded with nanocellulose; the preparation method of serpentine loaded with nanocellulose comprises the following steps: 5 parts of nanocellulose and 15 parts of serpentine are uniformly dispersed in anhydrous ethanol, stirred at a stirring speed of 600 r / min for 3 hours, and spray-dried at 105° C. to obtain serpentine loaded with nanocellulose;

[0042] The raw materials of the insulating layer include the following components in parts by weight:

[0043] 80 parts of polyethylene, 20 parts of EPDM rubber, 20 parts of ethylene-vinyl acetate copolymer, 1 part of diisononyl phthalate, 1 part of antioxidant 1010, 3 parts of maleic anhydride grafted polyethylene;

[0044] A method for preparing a weather-resistant low-voltage cable comprises the following steps:

[0045] S1, blending the above components of the protective layer in parts by weight, and extruding to obtain a protective layer material;

[0046] During extrusion, the extrusion process is zoned extrusion, the extrusion temperature of zone 1 is 140°C, the extrusion temperature of zone 2 is 160°C, and the extrusion temperature of zone 3 is 150°C;

[0047] S2, blending the above components of the insulating layer in parts by weight, and extruding the mixture to the outer periphery of the wire core to obtain a wire core coated with an insulating layer;

[0048] During extrusion, the extrusion process is zoned extrusion, the extrusion temperature of zone 1 is 150°C, the extrusion temperature of zone 2 is 170°C, and the extrusion temperature of zone 3 is 160°C;

[0049] S3. A protective layer material is coated on the outer periphery of the wire core coated with an insulating layer to obtain a low-voltage cable.

[0050] Example 2

[0051] A weather-resistant low-voltage cable comprises a core, an insulating layer and a protective layer from the inside to the outside, wherein the raw materials of the protective layer comprise the following components in parts by weight:

[0052] 60 parts of polyvinyl chloride resin, 18 parts of ethylene propylene rubber, 10 parts of polyhexanediol adipate, 14 parts of ethylene-vinyl acetate copolymer, 30 parts of filler, 34 parts of magnesium hydroxide, 3 parts of dioctyl phthalate, 2 parts of antioxidant 1035, 3 parts of maleic anhydride grafted polyethylene;

[0053] The filler is serpentine loaded with nanocellulose; the preparation method of serpentine loaded with nanocellulose comprises the following steps: 7 parts of nanocellulose and 23 parts of serpentine are uniformly dispersed in anhydrous ethanol, stirred at a stirring speed of 650 r / min for 2.5 hours, and spray-dried at 110° C. to obtain serpentine loaded with nanocellulose;

[0054] The raw materials of the insulating layer include the following components in parts by weight:

[0055] 80 parts of polyethylene, 25 parts of EPDM rubber, 23 parts of ethylene-vinyl acetate copolymer, 3 parts of diisononyl phthalate, 2 parts of antioxidant 1010, 5 parts of maleic anhydride grafted polyethylene;

[0056] A method for preparing a weather-resistant low-voltage cable comprises the following steps:

[0057] S1, blending the above components of the protective layer in parts by weight, and extruding to obtain a protective layer material;

[0058] During extrusion, the extrusion process is zoned extrusion, the extrusion temperature of zone 1 is 140°C, the extrusion temperature of zone 2 is 160°C, and the extrusion temperature of zone 3 is 150°C;

[0059] S2, blending the above components of the insulating layer in parts by weight, and extruding the mixture to the outer periphery of the wire core to obtain a wire core coated with an insulating layer;

[0060] During extrusion, the extrusion process is zoned extrusion, the extrusion temperature of zone 1 is 150°C, the extrusion temperature of zone 2 is 170°C, and the extrusion temperature of zone 3 is 160°C;

[0061] S3. A protective layer material is coated on the outer periphery of the wire core coated with an insulating layer to obtain a low-voltage cable.

[0062] Example 3

[0063] A weather-resistant low-voltage cable comprises a core, an insulating layer and a protective layer from the inside to the outside, wherein the raw materials of the protective layer comprise the following components in parts by weight:

[0064] 60 parts of polyvinyl chloride resin, 20 parts of ethylene propylene rubber, 12 parts of polyhexanediol adipate, 18 parts of ethylene-vinyl acetate copolymer, 35 parts of filler, 38 parts of magnesium hydroxide, 4 parts of dioctyl phthalate, 3 parts of antioxidant 1035, 4 parts of maleic anhydride grafted polyethylene;

[0065] The filler is serpentine loaded with nanocellulose; the preparation method of serpentine loaded with nanocellulose comprises the following steps: 8 parts of nanocellulose and 27 parts of serpentine are uniformly dispersed in anhydrous ethanol, stirred at a stirring speed of 700 r / min for 2 hours, and spray-dried at 115° C. to obtain serpentine loaded with nanocellulose;

[0066] The raw materials of the insulating layer include the following components in parts by weight:

[0067] 80 parts of polyethylene, 30 parts of EPDM rubber, 25 parts of ethylene-vinyl acetate copolymer, 5 parts of diisononyl phthalate, 3 parts of antioxidant 1010, 6 parts of maleic anhydride grafted polyethylene;

[0068] A method for preparing a weather-resistant low-voltage cable comprises the following steps:

[0069] S1, blending the above components of the protective layer in parts by weight, and extruding to obtain a protective layer material;

[0070] During extrusion, the extrusion process is zoned extrusion, the extrusion temperature of zone 1 is 140°C, the extrusion temperature of zone 2 is 160°C, and the extrusion temperature of zone 3 is 150°C;

[0071] S2, blending the above components of the insulating layer in parts by weight, and extruding the mixture to the outer periphery of the wire core to obtain a wire core coated with an insulating layer;

[0072] During extrusion, the extrusion process is zoned extrusion, the extrusion temperature of zone 1 is 150°C, the extrusion temperature of zone 2 is 170°C, and the extrusion temperature of zone 3 is 160°C;

[0073] S3. A protective layer material is coated on the outer periphery of the wire core coated with an insulating layer to obtain a low-voltage cable.

[0074] Example 4

[0075] The only difference between this embodiment and embodiment 2 is that in this embodiment, 29 parts of serpentine and 1 part of nanocellulose are added to the filler.

[0076] Example 5

[0077] The only difference between this embodiment and embodiment 2 is that in this embodiment, 28.5 parts of serpentine and 1.5 parts of nanocellulose are added to the filler.

[0078] Example 6

[0079] The only difference between this embodiment and embodiment 2 is that in this embodiment, 24 parts of serpentine and 6 parts of nanocellulose are added to the filler.

[0080] Example 7

[0081] The only difference between this embodiment and embodiment 5 is that in this embodiment, the filler is modified serpentine loaded with nanocellulose, and the preparation method of the modified serpentine loaded with nanocellulose comprises the following steps: dissolving 7 parts of hydroxystearic acid amide in toluene to obtain a hydroxystearic acid amide solution with a mass fraction of 6%, adding 23 parts of serpentine loaded with nanocellulose (wherein the weight ratio of serpentine to nanocellulose is 19:1) to the 6% hydroxystearic acid amide solution, dispersing evenly, concentrating, and drying to obtain modified serpentine loaded with nanocellulose.

[0082] Example 8

[0083] The only difference between this embodiment and embodiment 7 is that, in this embodiment, 29 parts of serpentine loaded with nanocellulose are added (wherein the weight ratio of serpentine to nanocellulose is 19:1), and 1 part of hydroxystearic acid amide is added.

[0084] Example 9

[0085] The only difference between this embodiment and embodiment 7 is that in this embodiment, 24 parts of serpentine loaded with nanocellulose are added (wherein the weight ratio of serpentine to nanocellulose is 19:1), and 6 parts of hydroxystearic acid amide are added.

[0086] Example 10

[0087] The only difference between this embodiment and embodiment 7 is that, in this embodiment, 28 parts of serpentine loaded with nanocellulose are added (wherein the weight ratio of serpentine to nanocellulose is 19:1), and 2 parts of hydroxystearic acid amide are added.

[0088] Comparative Example 1

[0089] The difference between this comparative example and Example 1 is that in this comparative example, the filler is 20 parts of serpentine.

[0090] Comparative Example 2

[0091] A weather-resistant low-voltage cable comprises a core, an insulating layer and a protective layer from the inside to the outside, wherein the raw materials of the protective layer comprise the following components in parts by weight:

[0092] 60 parts of polyvinyl chloride resin, 15 parts of ethylene propylene rubber, 8 parts of poly(hexanediol adipate), 10 parts of ethylene-vinyl acetate copolymer, 5 parts of nanocellulose, 15 parts of serpentine, 30 parts of magnesium hydroxide, 1 part of dioctyl phthalate, 1 part of antioxidant 1035, and 2 parts of maleic anhydride grafted polyethylene;

[0093] The raw materials of the insulating layer include the following components in parts by weight:

[0094] 80 parts of polyethylene, 20 parts of EPDM rubber, 20 parts of ethylene-vinyl acetate copolymer, 1 part of diisononyl phthalate, 1 part of antioxidant 1010, 3 parts of maleic anhydride grafted polyethylene;

[0095] A method for preparing a weather-resistant low-voltage cable comprises the following steps:

[0096] S1, blending the above components of the protective layer in parts by weight, and extruding to obtain a protective layer material;

[0097] During extrusion, the extrusion process is zoned extrusion, the extrusion temperature of zone 1 is 140°C, the extrusion temperature of zone 2 is 160°C, and the extrusion temperature of zone 3 is 150°C;

[0098] S2, blending the above components of the insulating layer in parts by weight, and extruding the mixture to the outer periphery of the wire core to obtain a wire core coated with an insulating layer;

[0099] During extrusion, the extrusion process is zoned extrusion, the extrusion temperature of zone 1 is 150°C, the extrusion temperature of zone 2 is 170°C, and the extrusion temperature of zone 3 is 160°C;

[0100] S3. A protective layer material is coated on the outer periphery of the wire core coated with an insulating layer to obtain a low-voltage cable.

[0101] The following performance tests were performed on the low-voltage cable protective layer materials prepared in Examples 1 to 10 and Comparative Examples 1 to 2:

[0102] (1) Mechanical properties test: The low-voltage cable protective layer materials prepared in Examples 1 to 10 and Comparative Examples 1 to 2 were subjected to a tensile strength test according to the test method in GB / T 1040.1-2018 "Determination of tensile properties of plastics Part 1: General Principles"; wherein the average value of 5 specimens was taken as the result value, and the test speed was 200 mm / min; the test results are shown in Table 1 below;

[0103] (2) Corrosion resistance test: The low-voltage cable protective layer materials prepared in Examples 1 to 10 and Comparative Examples 1 to 2 were immersed in a hydrochloric acid solution with a mass fraction of 30% for 72 hours, and the tensile strength after the corrosion test was tested according to the above tensile strength test method. The corrosion tensile strength change rate was calculated according to the following formula: Corrosion tensile strength change rate (%) = (tensile strength before corrosion test - tensile strength after corrosion test) / tensile strength before corrosion test × 100%; the test results are shown in Table 1 below;

[0104] (3) Thermal aging performance test: The low-voltage cable protective layer materials prepared in Examples 1 to 10 and Comparative Examples 1 to 2 were subjected to thermal aging tests according to GB / T 7141-2008 "Test Methods for Thermal Aging of Plastics", and then the tensile strength after the thermal aging test was tested according to the above-mentioned tensile strength test method, and the change rate of tensile strength after thermal aging was calculated according to the following formula: change rate of tensile strength after thermal aging (%) = (tensile strength before thermal aging test - tensile strength after thermal aging test) / tensile strength before thermal aging test × 100%; when conducting the thermal aging test, method B was adopted, the temperature was 90°C, and the time was 128 h. The test results are shown in Table 1 below.

[0105] Table 1 Performance test results of Examples 1 to 10 and Comparative Examples 1 to 2

[0106]

[0107] Compared with Comparative Examples 1-2, the tensile strength of the low-voltage cable protective layer material prepared in Example 1 is significantly improved, and the corrosion resistance tensile strength change rate and the heat aging tensile strength change rate are significantly reduced, indicating that when the filler is serpentine loaded with nanocellulose, the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer can be improved by loading nanocellulose on serpentine.

[0108] Compared with Examples 2 and 4, the tensile strength of the low-voltage cable protective layer materials prepared in Examples 5 to 6 is improved, and the corrosion resistance tensile strength change rate and the heat aging tensile strength change rate are reduced, indicating that when the weight ratio of serpentine to nanocellulose is 4 to 19:1, the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer can be further improved.

[0109] Compared with Example 5, the tensile strength of the low-voltage cable protective layer materials prepared in Examples 7 to 10 is improved, and the corrosion resistance tensile strength change rate and the heat aging tensile strength change rate are reduced, indicating that when the serpentine loaded with nanocellulose is modified by stearic acid amide compounds, the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer can be further improved.

[0110] Compared with Examples 7 to 8, the tensile strength of the low-voltage cable protective layer materials prepared in Examples 9 to 10 is improved, and the corrosion resistance tensile strength change rate and the heat aging tensile strength change rate are reduced, indicating that when the weight ratio of serpentine loaded with nanocellulose and stearic acid amide compounds is 4 to 14:1, the corrosion resistance, thermal stability and mechanical properties of the low-voltage cable protective layer can be further improved.

[0111] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A weather-resistant low-voltage cable, characterized in that: From the inside to the outside, it includes a core, an insulating layer and a protective layer. The raw materials of the protective layer include the following components in parts by weight: 60 parts of polyvinyl chloride resin, 15-20 parts of ethylene propylene rubber, 8-12 parts of polyhexanediol adipate, 10-18 parts of ethylene-vinyl acetate copolymer, 20-35 parts of filler, 30-38 parts of flame retardant, 1-4 parts of first plasticizer, 1-3 parts of first antioxidant, 2-4 parts of first compatibilizer; The filler is serpentine loaded with nanocellulose; The raw material of the nanocellulose-loaded serpentine includes serpentine and nanocellulose, and the weight ratio of the serpentine to the nanocellulose is 4-19:1; The particle size of the serpentine is 40-70 μm.

2. A weather-resistant low-voltage cable according to claim 1, characterized in that: The preparation method of the nanocellulose-loaded serpentine comprises the following steps: uniformly dispersing the nanocellulose and the serpentine in anhydrous ethanol, stirring, and drying to obtain the nanocellulose-loaded serpentine.

3. A weather-resistant low-voltage cable according to claim 1, characterized in that: The nanocellulose-loaded serpentine is a modified nanocellulose-loaded serpentine, and the raw materials of the modified nanocellulose-loaded serpentine include stearic acid amide compounds and the nanocellulose-loaded serpentine.

4. A weather-resistant low-voltage cable according to claim 3, characterized in that: The preparation method of the modified nanocellulose-loaded serpentine comprises the following steps: dissolving the stearic acid amide compound in toluene to obtain a stearic acid amide compound solution, adding the nanocellulose-loaded serpentine to the stearic acid amide compound solution, dispersing evenly, concentrating, and drying to obtain the modified nanocellulose-loaded serpentine.

5. A weather-resistant low-voltage cable according to claim 3, characterized in that: The weight ratio of the nanocellulose-loaded serpentine to the stearic acid amide compound is 4-14:

1.

6. A weather-resistant low-voltage cable according to claim 3, characterized in that: The stearic acid amide compound includes one or both of ethylene bis stearic acid amide and hydroxy stearic acid amide.

7. A weather-resistant low-voltage cable according to claim 1, characterized in that: The raw materials of the insulating layer include the following components in parts by weight: 80 parts of polyethylene, 20-30 parts of EPDM rubber, 20-25 parts of ethylene-vinyl acetate copolymer, 1-5 parts of a second plasticizer, 1-3 parts of a second antioxidant, and 3-6 parts of a second compatibilizer.

8. A weather-resistant low-voltage cable according to claim 7, characterized in that: The flame retardant is one or both of magnesium hydroxide and aluminum hydroxide; and / or The first plasticizer and the second plasticizer are independently one or more of diisononyl phthalate, dioctyl phthalate, and chlorinated paraffin; and / or The first antioxidant and the second antioxidant are independently one or more of antioxidant 1010, antioxidant 1035, and antioxidant K300; and / or The first compatibilizer and the second compatibilizer are each independently maleic anhydride grafted polyethylene.

9. A method for preparing a weather-resistant low-voltage cable according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, blending and extruding the components of the protective layer in parts by weight to obtain a protective layer material; S2, blending the components of the insulating layer in parts by weight, and extruding the mixture to the outer periphery of the wire core to obtain a wire core coated with an insulating layer; S3, coating the protective layer material on the outer periphery of the wire core coated with the insulating layer to obtain a low-voltage cable.

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