Aluminum alloy photovoltaic cable

Abstract

The present invention relates to the field of cable technology and proposes an aluminum alloy photovoltaic cable. The cable comprises, from the inside out, a conductor, an insulation layer, and a sheath layer. The sheath layer comprises the following components by weight: 100 parts high-density polyethylene, 10-15 parts nitrile rubber, 10-20 parts unsaturated polyester composite pyrophyllite powder, 6-10 parts ethylene-vinyl acetate copolymer, 0.2-0.3 parts vulcanizing agent, 2-4 parts plasticizer, and 0.5-1.3 parts antioxidant. The raw materials of the unsaturated polyester composite pyrophyllite powder include pyrophyllite powder and unsaturated polyester in a weight ratio of 32:2-9. The unsaturated polyester includes 196 type unsaturated polyester and 191 type unsaturated polyester. The above technical solution solves the problem of poor tensile properties of the sheath layer of the aluminum alloy photovoltaic cable in the related art.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to an aluminum alloy photovoltaic cable. Background Art

[0002] In practical applications, aluminum alloy photovoltaic cables must withstand long-term, complex, and ever-changing environmental challenges. During the construction and operation of photovoltaic power plants, cables are often subjected to mechanical stresses such as stretching, bending, and extrusion, with tensile stress being particularly hazardous. If the cable sheath's tensile strength is insufficient, it can easily crack or break due to external forces during installation or displacement caused by environmental factors. This not only leaves the internal conductors and insulation unprotected, significantly increasing safety risks such as short circuits and leakage, but also significantly shortens the cable's service life, increasing maintenance costs and the risk of downtime for the power generation system.

[0003] Currently, common aluminum alloy photovoltaic cable sheath materials on the market suffer from significant shortcomings in terms of tensile properties. For example, while ordinary polyethylene possesses a certain degree of flexibility, its tensile strength is low, making it difficult to withstand significant tensile forces. To improve this, reinforcing materials such as inorganic fillers are often added. However, this reinforcement method relies on the inherent hardness and strength of the filler itself. When added to the sheath, it suffers from uneven dispersion, resulting in very limited improvement in the sheath's tensile properties.

[0004] Therefore, developing an aluminum alloy photovoltaic cable that can significantly improve the tensile properties of the sheath layer is of great significance to extending the service life of the cable and ensuring the safe and stable operation of photovoltaic power stations. Summary of the Invention

[0005] The present invention provides an aluminum alloy photovoltaic cable, which solves the problem of poor tensile performance of the sheath layer of the aluminum alloy photovoltaic cable in the related art.

[0006] The technical solutions of the present invention are as follows:

[0007] The present invention provides an aluminum alloy photovoltaic cable, which comprises, from the inside to the outside, a conductor, an insulation layer, and a sheath layer, wherein the sheath layer comprises the following components in parts by weight:

[0008] 100 parts of high-density polyethylene, 10-15 parts of nitrile rubber, 10-20 parts of unsaturated polyester composite pyrophyllite powder, 6-10 parts of ethylene-vinyl acetate copolymer, 0.2-0.3 parts of vulcanizing agent, 2-4 parts of plasticizer, 0.5-1.3 parts of antioxidant;

[0009] The raw materials of the unsaturated polyester composite pyrophyllite powder include pyrophyllite powder and unsaturated polyester in a weight ratio of 32:2-9;

[0010] The unsaturated polyester includes 196 type unsaturated polyester and 191 type unsaturated polyester.

[0011] In the present invention, the aluminum alloy photovoltaic cable uses high-density polyethylene as the base material, which can provide basic structural support and protection for the cable. Combined with nitrile rubber, unsaturated polyester composite pyrophyllite powder, ethylene-vinyl acetate copolymer, plasticizer, and antioxidant, it can form an aluminum alloy photovoltaic cable sheath layer with a uniform, dense and stable internal structure.

[0012] In the present invention, each component in the sheath layer of the aluminum alloy photovoltaic cable will generate active free radicals during the processing process. The antioxidant can block the oxidation chain reaction by capturing free radicals, significantly delaying material aging, thereby improving the overall service life of the aluminum alloy photovoltaic cable. The antioxidant is a conventional antioxidant in the field, for example, it can be antioxidant 1010, antioxidant 168, antioxidant 3114, antioxidant 1076, antioxidant 330, preferably one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0013] In the present invention, the addition of a plasticizer to the sheath layer of the aluminum alloy photovoltaic cable can adjust the interaction force between the polymer molecular chains to a certain extent, facilitate the melting of the components of the sheath layer at a relatively low temperature, and improve production efficiency. The plasticizer is a conventional plasticizer in the field, for example, it can be one or more of dioctyl adipate, dibutyl phthalate, and dioctyl sebacate.

[0014] As a further technical solution, the weight of the 196 type unsaturated polyester is greater than the weight of the 191 type unsaturated polyester.

[0015] In the present invention, when the weight percentage of the 196-type unsaturated polyester in the aluminum alloy photovoltaic cable sheath layer is greater than the weight percentage of the 191-type unsaturated polyester, the tensile properties of the aluminum alloy photovoltaic cable sheath layer can be further improved, and the tensile strength thereof can be increased to above 31.5 MPa. When the weight percentage of the 196-type unsaturated polyester is less than the weight percentage of the 191-type unsaturated polyester, the effect of improving the tensile properties of the aluminum alloy photovoltaic cable sheath layer is less.

[0016] As a further technical solution, the preparation method of the unsaturated polyester composite pyrophyllite powder comprises the following steps:

[0017] A1, the pyrophyllite powder is added to water, the pH value of the mixed solution is adjusted to 4-6, then a coupling agent is added, uniformly dispersed, concentrated, and dried to obtain pre-treated pyrophyllite powder;

[0018] A2, adding the pretreated pyrophyllite powder to the unsaturated polyester, mixing evenly, solidifying, and pulverizing to obtain the unsaturated polyester composite pyrophyllite powder.

[0019] As a further technical solution, in step A1, the coupling agent includes one or more of titanate, γ-aminopropyltriethoxysilane, and γ-glycidoxypropyltrimethoxysilane, preferably γ-aminopropyltriethoxysilane.

[0020] As a further technical solution, the added amount of the coupling agent is 0.5% of the weight of the pyrophyllite powder.

[0021] As a further technical solution, in step A2, the mixing is performed uniformly by ball milling, with a ball milling speed of 200-300 rpm and a ball milling time of 20-30 min.

[0022] As a further technical solution, during the pulverization, the particle size of the unsaturated polyester composite pyrophyllite powder is 30-40 μm.

[0023] As a further technical solution, the raw material of the composite pyrophyllite powder also includes elastomer-modified epoxy vinyl ester resin.

[0024] In the present invention, when the raw materials of the composite pyrophyllite powder also include elastomer-modified epoxy vinyl ester resin, two different types of unsaturated polyester and elastomer-modified epoxy vinyl ester resin are used to jointly compound the pyrophyllite powder, which can significantly improve the impact resistance of the aluminum alloy photovoltaic cable sheath layer without affecting the tensile properties of the aluminum alloy photovoltaic cable sheath layer.

[0025] As a further technical solution, the weight ratio of the unsaturated polyester to the elastomer-modified epoxy vinyl ester resin is 1 to 3:1.

[0026] In the present invention, by regulating the weight ratio of unsaturated polyester and elastomer-modified epoxy vinyl ester resin, when the weight ratio of unsaturated polyester and elastomer-modified epoxy vinyl ester resin is 1-3:1, the impact resistance of the aluminum alloy photovoltaic cable sheath layer can be further improved, so that the notched impact strength of the aluminum alloy photovoltaic cable sheath layer is increased to 24.0-24.5 kJ·m -2 .

[0027] As a further technical solution, the preparation method of the unsaturated polyester composite pyrophyllite powder comprises the following steps:

[0028] B1, the pyrophyllite powder is added to water, the pH value of the mixed solution is adjusted to 4-6, then a coupling agent is added, the mixture is evenly dispersed, concentrated, and dried to obtain pre-treated pyrophyllite powder;

[0029] B2, add described pre-treated pyrophyllite powder to unsaturated polyester, after mixing, solidify, pulverize, obtain composite pyrophyllite powder semi-finished product;

[0030] B3. After dispersing the elastomer-modified epoxy vinyl ester resin in ethyl acetate, the composite pyrophyllite powder semi-finished product was added, mixed uniformly, concentrated, and dried to obtain unsaturated polyester composite pyrophyllite powder.

[0031] As a further technical solution, in step B2, during the pulverization, the particle size of the composite pyrophyllite powder semi-finished product is 30-40 μm.

[0032] As a further technical solution, the plasticizer includes one or more of dioctyl adipate, dibutyl phthalate, and dioctyl sebacate.

[0033] In the present invention, the three plasticizers, dioctyl adipate, dibutyl phthalate, and dioctyl sebacate, have relatively stable performance in the cable material and are not easy to volatilize and migrate. At the same time, they have good compatibility with the various components in the sheath layer of the aluminum alloy photovoltaic cable, thereby improving the processing performance of the sheath layer material. In addition, the plasticizing effect of the aluminum alloy photovoltaic cable is long-lasting during long-term use, thereby ensuring the reliability of the power transmission system.

[0034] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0035] In the present invention, antioxidant 1010, antioxidant 168, and antioxidant 1076 can better interact with the components in the aluminum alloy photovoltaic cable sheath layer, and have a better effect of improving the stability of the aluminum alloy photovoltaic cable sheath layer.

[0036] As a further technical solution, the vulcanizing agent includes one or both of sulfur and dicumyl peroxide, preferably sulfur.

[0037] As a further technical solution, the conductor is made of aluminum alloy;

[0038] The insulating layer is a polyvinyl chloride insulating layer.

[0039] In the present invention, the conductor is made of aluminum alloy, which is lighter than copper alloy and has good conductivity. Compared with pure aluminum, aluminum alloy has higher strength, which can improve the ability of aluminum alloy photovoltaic cables to withstand external mechanical stress to a certain extent.

[0040] The insulation layer is a polyvinyl chloride insulation layer. Polyvinyl chloride has good insulation properties and can effectively prevent current leakage, ensuring the safety of power transmission in aluminum alloy photovoltaic cables. At the same time, polyvinyl chloride has relatively good flexibility and can buffer the damage to the conductor caused by external stress. Combined with the sheath layer, it can enhance the overall stability of the aluminum alloy photovoltaic cable.

[0041] The present invention also provides a method for preparing an aluminum alloy photovoltaic cable, which is used to prepare the aluminum alloy photovoltaic cable, comprising the following steps:

[0042] S1. Extruding and coating the insulating layer on the periphery of the conductor to form a semi-finished cable;

[0043] S2. Blending the components of the sheath layer, extruding and coating the outer periphery of the semi-finished cable, and vulcanizing to obtain an aluminum alloy photovoltaic cable.

[0044] The working principle and beneficial effects of the present invention are:

[0045] 1. The present invention utilizes an unsaturated polyester composite with pyrophyllite powder to improve the tensile properties of the aluminum alloy photovoltaic cable sheath. To address the existing problem of limited reinforcement due to uneven dispersion when adding inorganic fillers, the present invention utilizes an unsaturated polyester composite with pyrophyllite powder, improving its dispersion in a high-density polyethylene substrate and thereby effectively increasing the overall tensile strength of the sheath material.

[0046] 2. The unsaturated polyester in the present invention adopts 196 type unsaturated polyester and 191 type unsaturated polyester. After the two different types of unsaturated polyesters are compounded with pyrophyllite powder, the active groups of the different types of unsaturated polyesters complement each other. After the compounding treatment of the pyrophyllite powder, the ability of the pyrophyllite powder to disperse stress in the high-density polyethylene substrate can be significantly improved, thereby effectively improving the overall tensile strength of the sheath layer material. DETAILED DESCRIPTION

[0047] 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.

[0048] In the following examples and comparative examples, the model of high-density polyethylene is DMDA-8008H; the model of nitrile rubber is NBR1704; the particle size of pyrophyllite powder is 45 μm; the model of ethylene-vinyl acetate copolymer is EVA 260; 196 type unsaturated polyester is purchased from Jinan Sunny Chemical Technology Co., Ltd.; 191 type unsaturated polyester is purchased from Jinan Sunny Chemical Technology Co., Ltd.; and the elastomer-modified epoxy vinyl ester resin is Derakane 8084.

[0049] Example 1

[0050] The preparation method of unsaturated polyester composite pyrophyllite powder comprises the following steps:

[0051] A1. Add 32 parts of pyrophyllite powder to 50 parts of water, adjust the pH value of the mixture to 4 with 8% hydrochloric acid solution, then add 0.16 parts of γ-aminopropyltriethoxysilane, disperse evenly, concentrate, and dry to obtain pretreated pyrophyllite powder;

[0052] A2, the above-mentioned pretreated pyrophyllite powder was added to 2 parts of 196 type unsaturated polyester and 2 parts of 191 type unsaturated polyester, and the mixture was ball-milled at a ball-milling speed of 200 rpm for 30 min, mixed uniformly, cured, and pulverized to obtain an unsaturated polyester composite pyrophyllite powder with a particle size of 35 μm;

[0053] A method for preparing an aluminum alloy photovoltaic cable comprises the following steps:

[0054] S1. Extruding and coating a polyvinyl chloride insulation layer on the outer periphery of the aluminum alloy conductor to form a semi-finished cable;

[0055] S2. Blend 100 parts of high-density polyethylene, 10 parts of nitrile rubber, 10 parts of unsaturated polyester composite pyrophyllite powder, 6 parts of ethylene-vinyl acetate copolymer, 2 parts of dioctyl adipate, 0.5 parts of antioxidant 1010, and 0.2 parts of sulfur, extrude and coat them on the periphery of the cable semi-finished product, and vulcanize to obtain an aluminum alloy photovoltaic cable.

[0056] Example 2

[0057] The preparation method of unsaturated polyester composite pyrophyllite powder comprises the following steps:

[0058] A1. Add 32 parts of pyrophyllite powder to 50 parts of water, adjust the pH value of the mixture to 5 with 8% by mass hydrochloric acid solution, then add 0.16 parts of γ-aminopropyltriethoxysilane, disperse evenly, concentrate, and dry to obtain pretreated pyrophyllite powder;

[0059] A2, the pretreated pyrophyllite powder was added to 4 parts of 196 type unsaturated polyester and 4 parts of 191 type unsaturated polyester, and the mixture was ball-milled at a speed of 250 rpm for 25 min, mixed evenly, cured, and pulverized to obtain an unsaturated polyester composite pyrophyllite powder with a particle size of 35 μm;

[0060] A method for preparing an aluminum alloy photovoltaic cable comprises the following steps:

[0061] S1. Extruding and coating a polyvinyl chloride insulation layer on the outer periphery of the aluminum alloy conductor to form a semi-finished cable;

[0062] S2. Blend 100 parts of high-density polyethylene, 13 parts of nitrile rubber, 16 parts of unsaturated polyester composite pyrophyllite powder, 8 parts of ethylene-vinyl acetate copolymer, 3 parts of dioctyl adipate, 1 part of antioxidant 1010, and 0.25 parts of sulfur, extrude and coat them on the periphery of the cable semi-finished product, and vulcanize to obtain an aluminum alloy photovoltaic cable.

[0063] Example 3

[0064] The preparation method of unsaturated polyester composite pyrophyllite powder comprises the following steps:

[0065] A1. Add 32 parts of pyrophyllite powder to 50 parts of water, adjust the pH value of the mixture to 6 with 8% hydrochloric acid solution, then add 0.16 parts of γ-aminopropyltriethoxysilane, disperse evenly, concentrate, and dry to obtain pretreated pyrophyllite powder;

[0066] A2, the above-mentioned pretreated pyrophyllite powder was added to 4.5 parts of 196 type unsaturated polyester and 4.5 parts of 191 type unsaturated polyester, and the mixture was ball-milled at a ball milling speed of 300 rpm for 20 min, mixed uniformly, cured, and pulverized to obtain an unsaturated polyester composite pyrophyllite powder with a particle size of 35 μm;

[0067] A method for preparing an aluminum alloy photovoltaic cable comprises the following steps:

[0068] S1. Extruding and coating a polyvinyl chloride insulation layer on the outer periphery of the aluminum alloy conductor to form a semi-finished cable;

[0069] S2. Blend 100 parts of high-density polyethylene, 15 parts of nitrile rubber, 20 parts of unsaturated polyester composite pyrophyllite powder, 10 parts of ethylene-vinyl acetate copolymer, 4 parts of dioctyl adipate, 1.3 parts of antioxidant 1010, and 0.3 part of sulfur, extrude and coat them on the periphery of the cable semi-finished product, and vulcanize to obtain an aluminum alloy photovoltaic cable.

[0070] Example 4

[0071] The only difference between this embodiment and embodiment 2 is that in the preparation method of unsaturated polyester composite pyrophyllite powder in this embodiment, the amount of 196 type unsaturated polyester added is 2 parts, and the amount of 191 type unsaturated polyester added is 6 parts.

[0072] Example 5

[0073] The only difference between this embodiment and embodiment 2 is that in the preparation method of unsaturated polyester composite pyrophyllite powder in this embodiment, the amount of 196 type unsaturated polyester added is 6 parts, and the amount of 191 type unsaturated polyester added is 2 parts.

[0074] Example 6

[0075] The only difference between this embodiment and embodiment 5 is that the preparation method of the unsaturated polyester composite pyrophyllite powder in this embodiment is different, specifically:

[0076] B1. Add 32 parts of pyrophyllite powder to 50 parts of water, adjust the pH value of the mixture to 5 with 8% by mass hydrochloric acid solution, then add 0.16 parts of γ-aminopropyltriethoxysilane, disperse evenly, concentrate, and dry to obtain pretreated pyrophyllite powder;

[0077] B2, the pretreated pyrophyllite powder was added to 1.5 parts of 196 type unsaturated polyester and 0.5 parts of 191 type unsaturated polyester, and the mixture was ball-milled at a ball-milling speed of 250 rpm for 25 min, mixed uniformly, cured, and pulverized to obtain a composite pyrophyllite powder semi-finished product with a particle size of 35 μm;

[0078] B3. After dispersing 6 parts of elastomer-modified epoxy vinyl ester resin in 40 parts of ethyl acetate, add the above-mentioned composite pyrophyllite powder semi-finished product, mix evenly, concentrate, and dry to obtain unsaturated polyester composite pyrophyllite powder.

[0079] Example 7

[0080] The only difference between this embodiment and Example 6 is that in the preparation method of the unsaturated polyester composite pyrophyllite powder in this embodiment, the amount of 196 type unsaturated polyester added is 5.25 parts, the amount of 191 type unsaturated polyester added is 1.75 parts, and the amount of elastomer-modified epoxy vinyl ester resin added is 1 part.

[0081] Example 8

[0082] The only difference between this embodiment and Example 6 is that in the preparation method of the unsaturated polyester composite pyrophyllite powder in this embodiment, the amount of 196 type unsaturated polyester added is 3 parts, the amount of 191 type unsaturated polyester added is 1 part, and the amount of elastomer-modified epoxy vinyl ester resin added is 4 parts.

[0083] Example 9

[0084] The only difference between this embodiment and Example 6 is that in the preparation method of the unsaturated polyester composite pyrophyllite powder in this embodiment, the amount of 196 type unsaturated polyester added is 4.5 parts, the amount of 191 type unsaturated polyester added is 1.5 parts, and the amount of elastomer-modified epoxy vinyl ester resin added is 2 parts.

[0085] Comparative Example 1

[0086] The only difference between this comparative example and Example 2 is that the unsaturated polyester composite pyrophyllite powder is replaced by an equal amount of pyrophyllite powder.

[0087] Comparative Example 2

[0088] The only difference between this comparative example and Example 2 is that the 196-type unsaturated polyester is replaced by an equal amount of the 191-type unsaturated polyester.

[0089] Comparative Example 3

[0090] The only difference between this comparative example and Example 2 is that the 191-type unsaturated polyester is replaced by an equal amount of the 196-type unsaturated polyester.

[0091] Experimental Example 1

[0092] Three specimens were cut from the sheath layer of the aluminum alloy photovoltaic cables prepared in Examples 1 to 5 and Comparative Examples 1 to 3, and dumbbell specimens with a thickness of 2 mm were prepared according to the method in GB / T 2951.11-2008 "General test methods for insulation and sheathing materials of electric and optical cables Part 11: General test methods for thickness and dimensional measurements - Mechanical properties tests". The tensile strength was tested. The test results are shown in Table 1.

[0093] Table 1 Test results of sheath layer tensile properties

[0094]

[0095] Compared with Comparative Examples 1 to 3, the tensile strength of Examples 1 to 5 is improved and can be increased to above 28.6 MPa, indicating that the tensile properties of the cable sheath layer can be improved by composite treatment of pyrophyllite powder with two different unsaturated polyesters, 196-type unsaturated polyester and 191-type unsaturated polyester.

[0096] Experimental Example 2

[0097] Three samples were cut from the sheath layer of each of the aluminum alloy photovoltaic cables prepared in Examples 5 to 9, and V-notched according to GB / T 1043.1-2008 were used for impact tests. The specific test data are shown in Table 2.

[0098] Table 2 Test results of impact resistance of sheath layer

[0099]

[0100] Compared with Example 5, the notched impact strength of Examples 6 to 9 is improved, indicating that when the raw materials of the composite pyrophyllite powder also include an elastomer-modified epoxy vinyl ester resin, the pyrophyllite powder is compounded with unsaturated polyester and elastomer-modified epoxy vinyl ester resin to improve the impact resistance of the cable sheath layer.

[0101] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, 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. An aluminum alloy photovoltaic cable, comprising a conductor, an insulation layer and a sheath layer from the inside out, characterized in that: The sheath layer comprises the following components in parts by weight: 100 parts of high-density polyethylene, 10-15 parts of nitrile rubber, 10-20 parts of unsaturated polyester composite pyrophyllite powder, 6-10 parts of ethylene-vinyl acetate copolymer, 0.2-0.3 parts of vulcanizing agent, 2-4 parts of plasticizer, 0.5-1.3 parts of antioxidant; The raw materials of the unsaturated polyester composite pyrophyllite powder include pyrophyllite powder and unsaturated polyester in a weight ratio of 32:2-9; The unsaturated polyester includes 196 type unsaturated polyester and 191 type unsaturated polyester; The preparation method of the unsaturated polyester composite pyrophyllite powder comprises the following steps: A1, the pyrophyllite powder is added to water, the pH value of the mixed solution is adjusted to 4-6, then a coupling agent is added, uniformly dispersed, concentrated, and dried to obtain pre-treated pyrophyllite powder; A2, adding the pretreated pyrophyllite powder to the unsaturated polyester, mixing evenly, solidifying, and pulverizing to obtain the unsaturated polyester composite pyrophyllite powder.

2. The aluminum alloy photovoltaic cable according to claim 1, characterized in that: The weight portion of the 196 type unsaturated polyester is greater than the weight portion of the 191 type unsaturated polyester.

3. The aluminum alloy photovoltaic cable according to claim 1, characterized in that: In step A1, the coupling agent includes one or more of titanate, γ-aminopropyltriethoxysilane, and γ-glycidoxypropyltrimethoxysilane.

4. The aluminum alloy photovoltaic cable according to claim 1, characterized in that: In step A2, the mixing is performed uniformly by ball milling, with a ball milling speed of 200-300 rpm and a ball milling time of 20-30 min.

5. The aluminum alloy photovoltaic cable according to claim 1, characterized in that: The raw materials of the unsaturated polyester composite pyrophyllite powder also include elastomer-modified epoxy vinyl ester resin.

6. The aluminum alloy photovoltaic cable according to claim 5, characterized in that: The weight ratio of the unsaturated polyester to the elastomer-modified epoxy vinyl ester resin is 1 to 3:

1.

7. The aluminum alloy photovoltaic cable according to claim 5, characterized in that: The preparation method of the unsaturated polyester composite pyrophyllite powder comprises the following steps: B1, the pyrophyllite powder is added to water, the pH value of the mixed solution is adjusted to 4-6, then a coupling agent is added, the mixture is evenly dispersed, concentrated, and dried to obtain pre-treated pyrophyllite powder; B2, add described pre-treated pyrophyllite powder to unsaturated polyester, after mixing, solidify, pulverize, obtain composite pyrophyllite powder semi-finished product; B3. After dispersing the elastomer-modified epoxy vinyl ester resin in ethyl acetate, the composite pyrophyllite powder semi-finished product was added, mixed uniformly, concentrated, and dried to obtain unsaturated polyester composite pyrophyllite powder.

8. The aluminum alloy photovoltaic cable according to claim 1, characterized in that: The plasticizer includes one or more of dioctyl adipate, dibutyl phthalate, and dioctyl sebacate; The antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076; The vulcanizing agent includes one or both of sulfur and dicumyl peroxide.

9. The aluminum alloy photovoltaic cable according to claim 1, characterized in that: The conductor is made of aluminum alloy; The insulating layer is a polyvinyl chloride insulating layer.

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