A highly flexible aluminum alloy cable

Abstract

The present invention relates to the field of cable technology, and proposes a highly flexible aluminum alloy cable, which comprises, from the inside to the outside, a conductor, an insulation layer, an armor layer, and a sheath layer, wherein the sheath layer comprises the following components in parts by weight: polyvinyl chloride, methylphenyl vinyl silicone rubber, ethylene-vinyl acetate copolymer, composite glass fiber material, garnet powder, plasticizer, antioxidant, crosslinking agent, and ultraviolet absorber; the preparation method of the composite glass fiber material comprises the following steps: A1, dispersing nanocellulose in water, adding glass fiber, and dispersing it evenly to form a cellulose dispersion; A2, adding a water-soluble calcium salt to the cellulose dispersion, dispersing it evenly, and freeze-drying it to obtain a composite glass fiber material. Through the above technical solution, the problem of poor flexibility when the aluminum alloy cable has good mechanical properties in the related art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a high-flexibility aluminum alloy cable. Background Art

[0002] Aluminum alloy cables are widely used in power transmission and distribution systems due to their light weight and excellent conductivity. However, cables may be subject to mechanical forces such as extrusion, puncture, and friction during laying, installation, and long-term use. To ensure cable strength, inorganic fillers or fiber-based reinforcements are often added to the sheath. These reinforcements effectively improve the mechanical properties of the cable and provide the necessary structural support. Because the elastic modulus of inorganic fillers and fiber-based reinforcements is much higher than that of organic polymers, they form a rigid skeleton within the polymer matrix. Excessive use can hinder the deformation of the polymer molecular chains under external forces, resulting in stress concentration around the reinforcements during cable bending. Fatigue fracture occurs under long-term bending stress, shortening the cable's service life.

[0003] Therefore, it is important to develop an aluminum alloy cable that has good flexibility while improving its mechanical properties, which is of great significance for improving the comprehensive performance of the aluminum alloy cable and extending the service life of the cable. Summary of the Invention

[0004] The present invention provides a highly flexible aluminum alloy cable, which solves the problem in the related art that the aluminum alloy cable has good mechanical properties but poor flexibility.

[0005] The technical solutions of the present invention are as follows:

[0006] The present invention provides a highly flexible aluminum alloy cable, which comprises, from the inside to the outside, a conductor, an insulation layer, an armor layer, and a sheath layer, wherein the sheath layer comprises the following components in parts by weight:

[0007] 80 parts of polyvinyl chloride, 10-18 parts of methylphenyl vinyl silicone rubber, 8-10 parts of ethylene-vinyl acetate copolymer, 3-10 parts of composite glass fiber material, 5-12 parts of garnet powder, 1-3 parts of plasticizer, 0.8-1.5 parts of antioxidant, 0.5-1 part of crosslinking agent, 1-2 parts of ultraviolet absorber;

[0008] The preparation method of the composite glass fiber material comprises the following steps:

[0009] A1. Disperse nanocellulose in water, add glass fiber, and disperse evenly to form a cellulose dispersion;

[0010] A2. Adding water-soluble calcium salt to the cellulose dispersion, dispersing the mixture evenly, and freeze-drying the mixture to obtain the composite glass fiber material.

[0011] The high-flexibility aluminum alloy cable of the present invention includes a conductor, an insulation layer, an armor layer and a sheath layer from the inside to the outside. The conductor is an aluminum alloy conductor with good electrical conductivity. Compared with pure aluminum or pure copper conductors, the aluminum alloy conductor has relatively high strength and light weight, which is conducive to the long-term use of the cable; the insulation layer is a cross-linked polyethylene insulation layer, which is wrapped around the outside of the conductor and plays a role in isolating the current to ensure that the insulation layer will not be broken down under a certain voltage; the armor layer is a galvanized steel strip metal armor layer, which is located outside the insulation layer and can withstand certain external force impact and extrusion to protect the internal conductor and insulation layer from damage; the sheath layer is the outermost layer of the high-flexibility aluminum alloy cable and plays a protective role for the high-flexibility aluminum alloy cable as a whole.

[0012] In the high-flexibility aluminum alloy cable sheath layer of the present invention, polyvinyl chloride is used as the base material to give the sheath layer a basic structural support function, which can resist external physical impact, wear and corrosion to a certain extent. The polyvinyl chloride can be polyvinyl chloride NI00-50, polyvinyl chloride S-700, polyvinyl chloride DG-800, polyvinyl chloride DG-1000K, preferably polyvinyl chloride NI00-50.

[0013] In the high-flexibility aluminum alloy cable sheath layer of the present invention, the ethylene-vinyl acetate copolymer has good toughness and elasticity, and has good compatibility with polyvinyl chloride. It is uniformly dispersed in the polyvinyl chloride matrix and can give the sheath layer basic flexibility. The model of the ethylene-vinyl acetate copolymer can be EVA V5110J, EVA 7760S, EVA 18J3, EVA1807EG, and is preferably EVA 18J3.

[0014] In the high-flexibility aluminum alloy cable sheath layer of the present invention, garnet powder is a silicate mineral with relatively high hardness. By combining it with a composite glass fiber material and reasonably regulating the content of the two, the mechanical properties of the sheath layer can be effectively enhanced.

[0015] In the sheath layer of the high-flexibility aluminum alloy cable of the present invention, the plasticizer can increase the fluidity between the polymer molecular chains in the sheath layer and improve the flexibility of the cable. At the same time, the plasticizer can also improve the processing performance of the polymer molecules, making them easier to plasticize during the molding process. The plasticizer can be any one or more plasticizers in the art, for example, dioctyl phthalate, diisononyl phthalate, trioctyl trimellitate, dioctyl terephthalate, dioctyl sebacate, preferably dioctyl phthalate and trioctyl trimellitate, more preferably trioctyl trimellitate. Dioctyl phthalate and trioctyl trimellitate have good compatibility with polyvinyl chloride substrates and can shorten the plasticization time of polymer molecules. Among them, trioctyl trimellitate has a better plasticizing effect.

[0016] In the sheath layer of the highly flexible aluminum alloy cable of the present invention, the addition of an antioxidant can delay the occurrence of oxidation reaction in the sheath layer to a certain extent, maintain the stability of the cable, and thus extend the service life of the cable. The antioxidant can be any one or more antioxidants in the art, for example, antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 1024, preferably antioxidant 1010 and antioxidant 1076. Antioxidant 1010 and antioxidant 1076 are both hindered phenol antioxidants, which have relatively stable chemical structures and can better withstand the high temperature environment during the processing of the components in the sheath layer.

[0017] In the high-flexibility aluminum alloy cable sheath layer of the present invention, the addition of a cross-linking agent can form chemical bonds between the polyvinyl chloride molecular chains to form a three-dimensional network structure. The cross-linked polymer material is not easy to soften and deform under high temperature and other external forces, thereby improving the stability of the cable. The cross-linking agent can be any one or more cross-linking agents in the art, for example, benzoyl peroxide, trimethylolpropane trimethacrylate, and vinyl triethoxysilane, preferably benzoyl peroxide and vinyl triethoxysilane.

[0018] In the high-flexibility and toughness aluminum alloy cable sheath layer of the present invention, the addition of an ultraviolet absorber can effectively prevent the degradation and aging of polyvinyl chloride and ethylene-vinyl acetate copolymer due to ultraviolet radiation, and can ensure that the cable can be used for a long time in an outdoor environment. The ultraviolet absorber can be any one or more ultraviolet absorbers in the field, for example, ultraviolet absorber UV-531, ultraviolet absorber UV-320, ultraviolet absorber UV-234, and ultraviolet absorber UV-238, preferably ultraviolet absorber UV-531 and ultraviolet absorber UV-234. Ultraviolet absorber UV-531 and ultraviolet absorber UV-234 have good stability and better compatibility with polyvinyl chloride substrates than other ultraviolet absorbers, and are better for improving the ability of the high-flexibility and toughness aluminum alloy cable sheath layer to resist ultraviolet damage.

[0019] As a further technical solution, the water-soluble calcium salt includes one or more of calcium acetate, calcium chloride, and calcium nitrate, preferably calcium chloride.

[0020] As a further technical solution, the weight ratio of the glass fiber to the nanocellulose is 15:2-6, for example, 15:2, 15:3, 15:4, 15:5, 15:6, preferably 15:3-5.

[0021] In the high-flexibility aluminum alloy cable sheath layer of the present invention, by adjusting the weight ratio of glass fiber and nanocellulose when preparing the composite glass fiber material, when the weight ratio of glass fiber and nanocellulose is 15:3-5, the flexibility of the aluminum alloy cable can be further improved, and the cyclic flexural test thereof can reach 6071000-6075000 times. When the weight ratio of glass fiber and nanocellulose is outside the range of 15:3-5, the effect of improving the flexibility of the aluminum alloy cable is slightly worse.

[0022] As a further technical solution, the average particle size of the nanocellulose is 20-50 nm, for example, 20 nm, 30 nm, 40 nm, 50 nm, preferably 50 nm.

[0023] As a further technical solution, the glass fiber is glass fiber powder, and the average particle size of the glass fiber powder is 50-80 μm, for example, 50 μm, 60 μm, 70 μm, 80 μm, preferably 60 μm.

[0024] As a further technical solution, the average particle size of the garnet powder is 10-30 μm, for example, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, preferably 30 μm.

[0025] As a further technical solution, in step A1 and step A2, the uniform dispersion is achieved by stirring, with the stirring speed independently ranging from 900 to 1200 rpm and the stirring time independently ranging from 20 to 40 min.

[0026] As a further technical solution, in step A2, during the freeze-drying, the temperature is -45~-40°C, the pressure is 10~15MPa, and the time is 40~45h.

[0027] As a further technical solution, the amount of the water-soluble calcium salt added is 0.2% to 0.3% of the weight of the glass fiber.

[0028] The present invention provides a method for preparing a high-flexibility aluminum alloy cable, which is used to prepare the high-flexibility aluminum alloy cable, comprising the following steps:

[0029] S1, extruding the insulating layer and coating it on the outer layer of the conductor to form an insulating layer;

[0030] S2. Installing an armor layer on the outer periphery of the insulating layer to obtain a semi-finished cable;

[0031] S3. Blend the polyethylene, methylphenyl vinyl silicone rubber, ethylene-vinyl acetate copolymer, composite glass fiber material, garnet powder, plasticizer, antioxidant, crosslinking agent, and ultraviolet absorber, and extrude and coat them on the outside of the cable semi-finished product to obtain the high-flexibility aluminum alloy cable.

[0032] As a further technical solution, the sheath layer further comprises 3 to 8 parts of N-hydroxymethylchloroacetamide.

[0033] The present invention also provides a method for preparing a highly flexible aluminum alloy cable, which comprises the following steps:

[0034] S1, extruding the insulating layer and coating it on the outer layer of the conductor to form an insulating layer;

[0035] S2. Installing an armor layer on the outer periphery of the insulating layer to obtain a semi-finished cable;

[0036] S3. After blending the composite glass fiber material, garnet powder and N-hydroxymethyl chloroacetamide, the remaining components in the sheath layer are added, blended, and extruded and coated on the outside of the semi-finished cable to obtain the highly flexible aluminum alloy cable.

[0037] The working principle and beneficial effects of the present invention are:

[0038] In the sheath layer of the highly flexible aluminum alloy cable of the present invention, nanocellulose and water-soluble calcium salts are used to perform a composite treatment on glass fibers. The resulting composite glass fiber material can improve the flexibility of the aluminum alloy cable, allowing its cyclic flexural test to reach more than 6,042,000 times. In order to improve the mechanical properties of aluminum alloy cables, inorganic fillers or fiber-based reinforcing agents are usually added to the sheath layer. However, the addition of a large amount of reinforcing agents can affect the flexibility of the cable. To address the problem of reduced cable flexibility when a large amount of reinforcing agents are present, the present invention uses nanocellulose and water-soluble calcium salts to perform a composite treatment on glass fibers. Nanocellulose-based aerogel materials are formed on the periphery of the rigid glass fibers, giving the glass fibers a certain flexibility. The presence of the water-soluble calcium salt can enhance the skeletal support strength of the glass fibers, while enhancing the bonding between the nanocellulose-based aerogel materials and the glass fibers, thereby improving the stability of the composite glass fiber material. Adding the composite glass fiber material to the sheath layer of the aluminum alloy cable does not affect the mechanical properties of the cable sheath layer, but can also improve the flexibility of the aluminum alloy cable. DETAILED DESCRIPTION

[0039] 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 embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] In the following embodiments and comparative examples, the model of polyvinyl chloride is NI00-50; the model of methylphenyl vinyl silicone rubber is MY120; the model of ethylene-vinyl acetate copolymer is EVA 18J3; the average particle size of nanocellulose is 50 nm; the glass fiber is glass fiber powder with an average particle size of 60 μm; the average particle size of garnet powder is 30 μm; and in the cross-linked polyethylene insulation layer, the polyethylene is linear low-density polyethylene with a model of DFDA-7042.

[0041] Example 1

[0042] The preparation method of the composite glass fiber material comprises the following steps:

[0043] A1. Disperse 2 parts of nanocellulose in 30 parts of water, add 15 parts of glass fiber, and stir at 900 rpm for 40 minutes to form a cellulose dispersion;

[0044] A2. Add 0.03 parts of calcium chloride to the above cellulose dispersion, stir at 900 rpm for 40 min, and freeze-dry at -45°C and 10 MPa for 45 h to obtain a composite glass fiber material;

[0045] A method for preparing a highly flexible aluminum alloy cable comprises the following steps:

[0046] S1. Extruding the raw material of the insulation layer and coating it on the outer layer of the aluminum alloy conductor to form a cross-linked polyethylene insulation layer;

[0047] S2. Installing a galvanized steel tape armor layer on the periphery of the cross-linked polyethylene insulation layer to obtain a semi-finished cable;

[0048] S3. Blend 80 parts of polyvinyl chloride, 10 parts of methylphenyl vinyl silicone rubber, 8 parts of ethylene-vinyl acetate copolymer, 3 parts of composite glass fiber material, 5 parts of garnet powder, 1 part of trioctyl trimellitate, 0.8 parts of antioxidant 1076, 0.5 parts of vinyl triethoxysilane and 1 part of ultraviolet absorber UV-531, extrude and coat the mixture on the outside of the semi-finished cable to obtain a highly flexible aluminum alloy cable.

[0049] Example 2

[0050] The preparation method of the composite glass fiber material comprises the following steps:

[0051] A1. Disperse 2 parts of nanocellulose in 30 parts of water, add 15 parts of glass fiber, and stir at 1050 rpm for 30 minutes to form a cellulose dispersion;

[0052] A2. Add 0.045 parts of calcium chloride to the above cellulose dispersion, stir at a stirring speed of 1050 rpm for 30 minutes, and freeze-dry at -40°C and 15 MPa for 40 hours to obtain a composite glass fiber material;

[0053] A method for preparing a highly flexible aluminum alloy cable comprises the following steps:

[0054] S1. Extruding the raw material of the insulation layer and coating it on the outer layer of the aluminum alloy conductor to form a cross-linked polyethylene insulation layer;

[0055] S2. Installing a galvanized steel tape armor layer on the periphery of the cross-linked polyethylene insulation layer to obtain a semi-finished cable;

[0056] S3. Blend 80 parts of polyvinyl chloride, 15 parts of methylphenyl vinyl silicone rubber, 9 parts of ethylene-vinyl acetate copolymer, 8 parts of composite glass fiber material, 8 parts of garnet powder, 2 parts of trioctyl trimellitate, 1 part of antioxidant 1076, 0.8 parts of vinyl triethoxysilane and 1.5 parts of ultraviolet absorber UV-531, extrude and coat the mixture on the outside of the semi-finished cable to obtain a highly flexible aluminum alloy cable.

[0057] Example 3

[0058] The preparation method of the composite glass fiber material comprises the following steps:

[0059] A1. Disperse 2 parts of nanocellulose in 30 parts of water, add 15 parts of glass fiber, and stir at 1200 rpm for 20 minutes to form a cellulose dispersion;

[0060] A2. Add 0.045 parts of calcium chloride to the above cellulose dispersion, stir at a stirring speed of 1200 rpm for 20 minutes, and freeze-dry at -40°C and 15 MPa for 40 hours to obtain a composite glass fiber material;

[0061] A method for preparing a highly flexible aluminum alloy cable comprises the following steps:

[0062] S1. Extruding the raw material of the insulation layer and coating it on the outer layer of the aluminum alloy conductor to form a cross-linked polyethylene insulation layer;

[0063] S2. Installing a galvanized steel tape armor layer on the periphery of the cross-linked polyethylene insulation layer to obtain a semi-finished cable;

[0064] S3. 80 parts of polyvinyl chloride, 18 parts of methylphenyl vinyl silicone rubber, 10 parts of ethylene-vinyl acetate copolymer, 10 parts of composite glass fiber material, 12 parts of garnet powder, 3 parts of trioctyl trimellitate, 1.5 parts of antioxidant 1010, 1 part of vinyl triethoxysilane and 2 parts of ultraviolet absorber UV-234 are blended and extruded and coated on the outside of the cable semi-finished product to obtain a highly flexible aluminum alloy cable.

[0065] Example 4

[0066] The only difference between this embodiment and embodiment 2 is that in the preparation method of the composite glass fiber material in this embodiment, 3 parts of nanocellulose are added.

[0067] Example 5

[0068] The only difference between this embodiment and embodiment 2 is that in the preparation method of the composite glass fiber material in this embodiment, 5 parts of nanocellulose are added.

[0069] Example 6

[0070] The only difference between this embodiment and embodiment 2 is that in the preparation method of the composite glass fiber material in this embodiment, 6 parts of nanocellulose are added.

[0071] Example 7

[0072] The only difference between this embodiment and embodiment 6 is that the preparation method of the high-flexibility aluminum alloy cable in this embodiment is different, specifically:

[0073] S1. Extruding the raw material of the insulation layer and coating it on the outer layer of the aluminum alloy conductor to form a cross-linked polyethylene insulation layer;

[0074] S2. Installing a galvanized steel tape armor layer on the periphery of the cross-linked polyethylene insulation layer to obtain a semi-finished cable;

[0075] S3. 8 parts of composite glass fiber material, 8 parts of garnet powder and 3 parts of N-hydroxymethylchloroacetamide are blended together, and then 80 parts of polyvinyl chloride, 15 parts of methylphenyl vinyl silicone rubber, 9 parts of ethylene-vinyl acetate copolymer, 2 parts of trioctyl trimellitate, 1 part of antioxidant 1076, 0.8 parts of vinyl triethoxysilane and 1.5 parts of ultraviolet absorber UV-531 are added and blended, and then extruded and coated on the outside of the cable semi-finished product to obtain a highly flexible aluminum alloy cable.

[0076] Example 8

[0077] The only difference between this embodiment and embodiment 7 is that, in this embodiment, 5 parts of N-hydroxymethyl chloroacetamide are added.

[0078] Example 9

[0079] The only difference between this embodiment and embodiment 7 is that, in this embodiment, 6 parts of N-hydroxymethyl chloroacetamide are added.

[0080] Example 10

[0081] The only difference between this embodiment and embodiment 7 is that, in this embodiment, 8 parts of N-hydroxymethyl chloroacetamide are added.

[0082] Comparative Example 1

[0083] The only difference between this comparative example and Example 1 is that in this comparative example, the composite glass fiber material is replaced with an equal amount of glass fiber.

[0084] Comparative Example 2

[0085] The only difference between this comparative example and Example 1 is that the preparation method of the high-flexibility aluminum alloy cable in this comparative example is different, specifically:

[0086] A method for preparing a highly flexible aluminum alloy cable comprises the following steps:

[0087] S1. Extruding the raw material of the insulation layer and coating it on the outer layer of the aluminum alloy conductor to form a cross-linked polyethylene insulation layer;

[0088] S2. Installing a galvanized steel tape armor layer on the periphery of the cross-linked polyethylene insulation layer to obtain a semi-finished cable;

[0089] S3. 80 parts of polyvinyl chloride, 10 parts of methylphenyl vinyl silicone rubber, 8 parts of ethylene-vinyl acetate copolymer, 3 parts of glass fiber, 0.4 parts of nanocellulose, 0.006 parts of calcium chloride, 5 parts of garnet powder, 1 part of trioctyl trimellitate, 0.8 parts of antioxidant 1076, 0.5 parts of vinyl triethoxysilane and 1 part of ultraviolet absorber UV-531 are blended, and extruded and coated on the outside of the cable semi-finished product to obtain a highly flexible aluminum alloy cable.

[0090] Comparative Example 3

[0091] The only difference between this comparative example and Example 1 is that in this comparative example, no composite glass fiber material is added.

[0092] Experimental Example 1

[0093] The high-flexibility aluminum alloy cables prepared in Examples 1 to 6 and Comparative Examples 1 to 3 were subjected to a flexural test according to the test method specified in GB / T 5013.2-2008 "Rubber insulated cables with rated voltages of 450 / 750 V and below - Part 2: Test methods", with a load of 1 kg and a pulley diameter of 80 mm. The test results are shown in Table 1:

[0094] Table 1 Flexural test results of Examples 1 to 6 and Comparative Examples 1 to 3

[0095]

[0096] Compared with Comparative Examples 1 to 3, the number of cyclic flexural tests of the high-flexibility aluminum alloy cables prepared in Examples 1 to 6 is increased, indicating that the composite glass fiber material is prepared by composite treatment of glass fiber with nanocellulose and water-soluble calcium salt, and is added to the sheath layer of the high-flexibility aluminum alloy cable, which can effectively improve the flexibility of the aluminum alloy cable.

[0097] Experimental Example 2

[0098] Three specimens were cut from the sheath layer of each of the highly flexible aluminum alloy cables prepared in Examples 6 to 10. Dumbbell specimens with a thickness of 2 mm were prepared according to the method in GB / T2951.11-2008 "General test methods for insulation and sheath materials of electric and optical cables - Part 11: General test methods - Thickness and dimensional measurements - Mechanical properties tests". The tensile strength and elongation at break were tested. The test results are shown in Table 2.

[0099] Table 2 Test results of tensile strength and elongation at break of Examples 6 to 10

[0100]

[0101] As can be seen from Table 2, the tensile strength of the high-flexibility aluminum alloy cable sheath layer prepared in Examples 6 to 10 is ≥16.5N / mm 2 , elongation at break ≥ 310%, minimum tensile strength 12.5N / mm 2 , the standard requirement of a minimum elongation at break of 150%; in addition, compared with Example 6, the tensile strength and elongation at break of Examples 7 to 10 are improved, indicating that when N-hydroxymethylchloroacetamide is added to the sheath layer of the high-flexibility aluminum alloy cable, the mechanical properties of the sheath layer of the high-flexibility aluminum alloy cable can be improved.

[0102] 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 scope of protection of the present invention.

Claims

1. A highly flexible aluminum alloy cable, comprising, from the inside to the outside, a conductor, an insulation layer, an armor layer, and a sheath layer, characterized in that: The sheath layer comprises the following components in parts by weight: 80 parts of polyvinyl chloride, 10-18 parts of methylphenyl vinyl silicone rubber, 8-10 parts of ethylene-vinyl acetate copolymer, 3-10 parts of composite glass fiber material, 5-12 parts of garnet powder, 1-3 parts of plasticizer, 0.8-1.5 parts of antioxidant, 0.5-1 part of crosslinking agent, 1-2 parts of ultraviolet absorber; The preparation method of the composite glass fiber material comprises the following steps: A1. Disperse nanocellulose in water, add glass fiber, and disperse evenly to form a cellulose dispersion; A2. Adding water-soluble calcium salt to the cellulose dispersion, dispersing the mixture evenly, and freeze-drying the mixture to obtain the composite glass fiber material.

2. A highly flexible aluminum alloy cable according to claim 1, characterized in that: The water-soluble calcium salt includes one or more of calcium acetate, calcium chloride and calcium nitrate.

3. The highly flexible aluminum alloy cable according to claim 1, characterized in that: The weight ratio of the glass fiber to the nanocellulose is 15:2-6.

4. The highly flexible aluminum alloy cable according to claim 1, characterized in that: In step A1 and step A2, the uniform dispersion is achieved by stirring, with the stirring speed being independently 900-1200 rpm and the stirring time being independently 20-40 min.

5. The highly flexible aluminum alloy cable according to claim 1, characterized in that: In step A2, during the freeze-drying, the temperature is -45 to -40°C, the pressure is 10 to 15 MPa, and the time is 40 to 45 hours.

6. The highly flexible aluminum alloy cable according to claim 1, characterized in that: The amount of the water-soluble calcium salt added is 0.2% to 0.3% of the weight of the glass fiber.

7. The high-flexibility aluminum alloy cable according to claim 1, characterized in that: The sheath layer further comprises 3 to 8 parts of N-hydroxymethyl chloroacetamide.

8. The highly flexible aluminum alloy cable according to claim 1, characterized in that: The conductor is an aluminum alloy conductor; The insulating layer is a cross-linked polyethylene insulating layer; The armor layer is a galvanized steel strip.

9. The highly flexible aluminum alloy cable according to claim 1, characterized in that: The plasticizer includes one or two of dioctyl phthalate and trioctyl trimellitate; The antioxidant includes one or both of antioxidant 1010 and antioxidant 1076.

10. The highly flexible aluminum alloy cable according to claim 1, characterized in that: The cross-linking agent includes one or two of benzoyl peroxide and vinyl triethoxysilane; The ultraviolet absorber includes one or both of ultraviolet absorber UV-531 and ultraviolet absorber UV-234.

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