A photovoltaic cable resistant to photothermal aging and its preparation method

Abstract

The application relates to a light-heat aging resistant photovoltaic cable and a preparation method thereof, and belongs to the technical field of high polymer materials. The light-heat aging resistant photovoltaic cable is composed of a conductor core and an insulating layer, a filling layer and an outer sheath which are sequentially coated outside the conductor core; the outer sheath comprises the following raw materials in parts by weight: 80-120 parts of polyvinyl chloride resin, 3-5 parts of a modified aging resistant agent, 2-8 parts of a modified flame retardant, 1-3 parts of dioctyl phthalate, 10-20 parts of nano silicon dioxide, 1-3 parts of butyl stearate and 3-5 parts of zinc stearate; the light-heat aging resistant photovoltaic cable prepared by the application has not only good ultraviolet resistance and heat aging resistance, but also excellent flame retardation.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a photovoltaic cable resistant to photothermal aging and its preparation method. Background Technology

[0002] A photovoltaic (PV) power generation system is a power generation system that uses the photovoltaic effect of semiconductor materials to convert solar radiation energy into electrical energy. PV cables, as dedicated connecting cables for PV power plant systems, are mainly composed of copper stranded wire, an insulation layer, and a protective sheath. They possess characteristics such as high temperature resistance, cold resistance, oil resistance, acid and alkali resistance, long service life, and environmental friendliness.

[0003] However, photovoltaic equipment is generally installed in areas with abundant sunlight but harsh environments, such as deserts, Gobi, mountains, and coastal areas. This exposes photovoltaic cables to high temperatures and ultraviolet radiation for extended periods, causing the cable sheaths to age rapidly due to prolonged exposure to sunlight. The root cause lies in the poor stability of PVC. Under ultraviolet radiation, the dechlorination reaction is accelerated, causing the material to harden and become easily damaged under external forces, thus losing its protective function. In addition, although PVC has a certain flame-retardant effect when it burns, its flame-retardant properties are no longer sufficient to meet the increasing demands of practical applications. Therefore, the development of photovoltaic cables with excellent resistance to photothermal aging has significant practical significance and application value. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a photovoltaic cable resistant to photothermal aging and its preparation method.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A photovoltaic cable resistant to photothermal aging is composed of a conductor core and an insulation layer, a filling layer and an outer sheath sequentially wrapped around the outside of the conductor core;

[0007] Furthermore, the conductor core is a copper conductor core;

[0008] Furthermore, the outer sheath comprises the following raw materials in parts by weight: 80-120 parts of polyvinyl chloride resin, 3-5 parts of modified aging resistant agent, 2-8 parts of modified flame retardant, 1-3 parts of dioctyl phthalate, 10-20 parts of nano silica, 1-3 parts of butyl stearate, and 3-5 parts of zinc stearate.

[0009] Furthermore, the modified anti-aging agent is prepared by the following method:

[0010] Step A1: 1,3-Dimethyl-6-aminouracil and aqueous acetic acid solution were mixed evenly under ultrasonic conditions, and then formaldehyde was added. The mixture was reacted at 35°C for 24 hours under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature, filtered, washed, and dried under vacuum at 60°C for 24 hours to obtain the compound.

[0011] Furthermore, the ratio of 1,3-dimethyl-6-aminourea pyrimidine, aqueous acetic acid solution, and formaldehyde is 0.02-0.04 mol: 30 mL: 0.01-0.02 mol, and the volume ratio of acetic acid to deionized water in the aqueous acetic acid solution is 1:9;

[0012] The compound was first prepared by reacting 1,3-dimethyl-6-aminourea pyrimidine with formaldehyde;

[0013] Step A2: Add maleic anhydride to a four-necked flask equipped with a thermometer, condenser and mechanical stirrer, heat to 120°C and stir for 15 min, then cool to 90°C and add the compound and mix well, then add tetrahydrofuran and react for 5 h, rotary evaporate and dry to obtain the preproduct.

[0014] Furthermore, the ratio of maleic anhydride, the compound, and tetrahydrofuran is 0.02-0.04 mol: 0.01-0.02 mol: 10-20 mL;

[0015] Secondly, the amino group of the compound is reacted with maleic anhydride to prepare the preproduct.

[0016] Step A3: Mix 2,4-dihydroxybenzophenone, the preproduct and N,N-dimethylformamide evenly, react at 80-100℃ for 3 hours under nitrogen protection, cool to room temperature, filter, wash and dry to obtain the modified anti-aging agent.

[0017] Furthermore, the ratio of 2,4-dihydroxybenzophenone, the preproduct, and N,N-dimethylformamide is 0.1-0.2 mol: 0.1-0.2 mol: 10-20 mL;

[0018] Finally, the modified anti-aging agent was prepared by reacting the carboxyl group of the preproduct with the hydroxyl group of 2,4-dihydroxybenzophenone.

[0019] Furthermore, the modified flame retardant is prepared by the following method:

[0020] Step B1: Mix m-chloroaniline and ethanol evenly at 80°C, then add benzaldehyde and mix evenly. React at 80°C for 8 hours, cool to room temperature, filter, wash, and vacuum dry for 24 hours to obtain intermediate 1.

[0021] Furthermore, the ratio of m-chloroaniline, ethanol, and benzaldehyde used is 0.01-0.02 mol: 300 mL: 0.01-0.02 mol;

[0022] First, the amino group of m-chloroaniline reacts with the aldehyde group of benzaldehyde to generate intermediate 1;

[0023] Step B2: Mix intermediate 1, phenylboronic acid and N,N-dimethylformamide, react at 50-100℃ for 5-10h, cool to room temperature, filter, wash and dry to obtain intermediate 2;

[0024] Furthermore, the ratio of intermediate 1, phenylboronic acid, and N,N-dimethylformamide is 0.1-0.2 mol: 0.05-0.1 mol: 150-300 mL;

[0025] Secondly, intermediate 2 is generated by reacting the chlorine atom of intermediate 1 with phenylboronic acid.

[0026] Step B3: Mix 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and ethanol at 80°C until homogeneous. Under magnetic stirring, slowly add intermediate 2 and react for 8 hours. Filter, wash, and vacuum dry for 24 hours to obtain the modified flame retardant.

[0027] Furthermore, the ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, ethanol, and intermediate 2 is 0.02-0.04 mol: 300 mL: 0.01-0.02 mol;

[0028] Finally, the modified flame retardant was prepared by reacting intermediates 2 and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0029] A method for preparing a photovoltaic cable resistant to photothermal aging specifically includes the following steps:

[0030] S1. Weigh the raw materials according to the weight parts, mix polyvinyl chloride resin, modified aging resistant agent, modified flame retardant, dioctyl phthalate, nano silica, butyl stearate and zinc stearate, mix at high speed of 2000 rpm for 5 minutes, extrude, cool and granulate to obtain the outer sheath.

[0031] S2. Polyethylene is extruded onto the surface of the conductor core to form an insulation layer, and polypropylene is filled onto the surface of the insulation layer to form a filler layer. The outer sheath is then extruded onto the surface of the filler layer and cooled to solidify, thus obtaining a photovoltaic cable resistant to photothermal aging.

[0032] The beneficial effects of this invention are:

[0033] The photovoltaic cable of the present invention has good resistance to ultraviolet radiation and thermal aging, and also has excellent flame retardant effect, thus extending its service life.

[0034] In the modified aging resistant agent prepared by this invention, the carbonyl group of 2,4-dihydroxybenzophenone forms an intramolecular hydrogen bond with the benzene ring, which can efficiently absorb ultraviolet light and release the excited electrons to a higher energy level through molecular vibration in the form of weak long wavelengths, thereby reducing material aging caused by ultraviolet light. At the same time, the maleimide group enhances the intermolecular forces, increases the glass transition temperature and melting point of the material, inhibits the movement of molecular chain segments at high temperatures, and reduces material aging caused by high-temperature thermal aging. In addition, the nitrogen atom in 1,3-dimethyl-6-aminouracil can use its lone pair electrons to capture alkyl free radicals and peroxy free radicals generated by the thermal degradation of PVC, terminate the chain reaction, and delay the thermo-oxidative aging process. The amide bond in the preproduct forms a hydrogen bond network with the PVC molecular chain, increases the glass transition temperature of the material, inhibits the movement of chain segments at high temperatures, and reduces material aging caused by high-temperature thermal aging. Furthermore, the ester bond in this modified aging resistant agent improves the low-temperature toughness of PVC through flexibility and maintains the stiffness of the material through hydrogen bonding.

[0035] The modified flame retardant prepared by this invention significantly improves the flame retardant performance of PVC outer sheaths through the synergistic effect of boron and phosphorus. In the initial stage of combustion, the boric acid groups in intermediate 2 are dehydrated by heat, accelerating char formation and forming a glassy protective layer, effectively inhibiting flame spread. Its aromatic boric acid structure is transformed into a BOC network structure at high temperature, enhancing the stability of the char layer. At the same time, the non-combustible gas generated by the decomposition of boric acid groups expands the char layer, further improving the flame retardant performance. In addition, the phosphorus-nitrogen flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, as a phosphoraphenanthrene compound with high thermal stability, promotes the formation of a dense and continuous char layer during combustion, insulating against heat and oxygen and blocking the exchange of combustible gases, inhibiting combustion, and synergistically retardant with phosphorus-oxygen double bonds, improving flame retardant efficiency. Furthermore, the modified flame retardant prepared by this invention is halogen-free, which helps reduce environmental pollution and ecosystem damage, is harmless to human health, and achieves sustainable development. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1: A method for preparing a photovoltaic cable resistant to photothermal aging, specifically including the following steps:

[0038] S1. Weigh the raw materials according to the weight parts, mix 80 parts of polyvinyl chloride resin, 3 parts of modified aging resistant agent, 2 parts of modified flame retardant, 1 part of dioctyl phthalate, 10 parts of nano silica, 1 part of butyl stearate and 3 parts of zinc stearate, mix at high speed of 2000 rpm for 5 minutes, extrude, cool and granulate to obtain the outer sheath.

[0039] S2. Polyethylene is extruded onto the surface of the copper conductor core to form an insulation layer, and polypropylene is filled onto the surface of the insulation layer to form a filler layer. The outer sheath is then extruded onto the surface of the filler layer and cooled to solidify, thus obtaining a photovoltaic cable resistant to photothermal aging.

[0040] The modified anti-aging agent is prepared by the following method:

[0041] Step A1: 0.02 mol of 1,3-dimethyl-6-aminourea pyrimidine and 30 mL of acetic acid aqueous solution were mixed evenly under ultrasonic conditions, and then 0.01 mol of formaldehyde was added. The mixture was reacted at 35 °C for 24 h under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature, filtered, washed, and dried under vacuum at 60 °C for 24 h to obtain the compound. The volume ratio of acetic acid to deionized water in the acetic acid aqueous solution was 1:9.

[0042] Step A2: Add 0.02 mol of maleic anhydride to a four-necked flask equipped with a thermometer, condenser and mechanical stirrer, heat to 120℃ and stir for 15 min, then cool to 90℃ and add 0.01 mol of the compound and mix well, then add 10 mL of tetrahydrofuran and react for 5 h, rotary evaporate and dry to obtain the preproduct.

[0043] Step A3: Mix 0.1 mol of 2,4-dihydroxybenzophenone, 0.1 mol of preproduct and 10 mL of N,N-dimethylformamide evenly, react at 80°C for 3 h under nitrogen protection, cool to room temperature, filter, wash and dry to obtain the modified anti-aging agent;

[0044] The modified flame retardant is prepared by the following method:

[0045] Step B1: Mix 0.01 mol m-chloroaniline and 300 mL ethanol at 80 °C until homogeneous, then add 0.01 mol benzaldehyde and mix until homogeneous. React at 80 °C for 8 h, cool to room temperature, filter, wash, and vacuum dry for 24 h to obtain intermediate 1.

[0046] Step B2: Mix 0.1 mol of intermediate 1, 0.05 mol of phenylboronic acid and 150 mL of N,N-dimethylformamide, react at 50 °C for 5-10 h, cool to room temperature, filter, wash and dry to obtain intermediate 2;

[0047] Step B3: Mix 0.02 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 300 mL of ethanol at 80 °C until homogeneous. Under magnetic stirring, slowly add 0.01 mol of intermediate 2 and react for 8 h. Filter, wash, and vacuum dry for 24 h to obtain the modified flame retardant.

[0048] Example 2: A method for preparing a photovoltaic cable resistant to photothermal aging, specifically including the following steps:

[0049] S1. Weigh the raw materials according to the weight parts, mix 100 parts of polyvinyl chloride resin, 4 parts of modified aging resistant agent, 5 parts of modified flame retardant, 2 parts of dioctyl phthalate, 15 parts of nano silica, 2 parts of butyl stearate and 4 parts of zinc stearate, mix at high speed of 2000 rpm for 5 minutes, extrude, cool and granulate to obtain the outer sheath.

[0050] S2. Polyethylene is extruded onto the surface of the copper conductor core to form an insulation layer, and polypropylene is filled onto the surface of the insulation layer to form a filler layer. The outer sheath is then extruded onto the surface of the filler layer and cooled to solidify, thus obtaining a photovoltaic cable resistant to photothermal aging.

[0051] The modified anti-aging agent is prepared by the following method:

[0052] Step A1: 0.03 mol of 1,3-dimethyl-6-aminoureapyrimidine and 30 mL of acetic acid aqueous solution were mixed evenly under ultrasonic conditions, and then 0.015 mol of formaldehyde was added. The mixture was reacted at 35 °C for 24 h under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature, filtered, washed, and dried under vacuum at 60 °C for 24 h to obtain the compound. The volume ratio of acetic acid to deionized water in the acetic acid aqueous solution was 1:9.

[0053] Step A2: Add 0.03 mol of maleic anhydride to a four-necked flask equipped with a thermometer, condenser and mechanical stirrer, heat to 120℃ and stir for 15 min, then cool to 90℃ and add 0.015 mol of the compound and mix well, then add 15 mL of tetrahydrofuran and react for 5 h, rotary evaporate and dry to obtain the preproduct.

[0054] Step A3: Mix 0.15 mol of 2,4-dihydroxybenzophenone, 0.15 mol of preproduct and 15 mL of N,N-dimethylformamide evenly, react at 90°C for 3 h under nitrogen protection, cool to room temperature, filter, wash and dry to obtain the modified anti-aging agent.

[0055] The modified flame retardant is prepared by the following method:

[0056] Step B1: Mix 0.015 mol m-chloroaniline and 300 mL ethanol at 80 °C until homogeneous, then add 0.015 mol benzaldehyde and mix until homogeneous. React at 80 °C for 8 h, cool to room temperature, filter, wash, and vacuum dry for 24 h to obtain intermediate 1.

[0057] Step B2: Mix 0.15 mol of intermediate 1, 0.075 mol of phenylboronic acid and 225 mL of N,N-dimethylformamide, react at 75 °C for 7.5 h, cool to room temperature, filter, wash and dry to obtain intermediate 2;

[0058] Step B3: Mix 0.03 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 300 mL of ethanol at 80 °C until homogeneous. Under magnetic stirring, slowly add 0.015 mol of intermediate 2 and react for 8 h. Filter, wash, and vacuum dry for 24 h to obtain the modified flame retardant.

[0059] Example 3: A method for preparing a photovoltaic cable resistant to photothermal aging, specifically including the following steps:

[0060] S1. Weigh the raw materials according to the weight parts, mix 120 parts of polyvinyl chloride resin, 5 parts of modified aging resistant agent, 8 parts of modified flame retardant, 3 parts of dioctyl phthalate, 20 parts of nano silica, 3 parts of butyl stearate and 5 parts of zinc stearate, mix at high speed of 2000 rpm for 5 minutes, extrude, cool and granulate to obtain the outer sheath.

[0061] S2. Polyethylene is extruded onto the surface of the copper conductor core to form an insulation layer, and polypropylene is filled onto the surface of the insulation layer to form a filler layer. The outer sheath is then extruded onto the surface of the filler layer and cooled to solidify, thus obtaining a photovoltaic cable resistant to photothermal aging.

[0062] The modified anti-aging agent is prepared by the following method:

[0063] Step A1: 0.04 mol of 1,3-dimethyl-6-aminourea pyrimidine and 30 mL of acetic acid aqueous solution were mixed evenly under ultrasonic conditions, and then 0.02 mol of formaldehyde was added. The mixture was reacted at 35 °C for 24 h under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature, filtered, washed, and dried under vacuum at 60 °C for 24 h to obtain the compound. The volume ratio of acetic acid to deionized water in the acetic acid aqueous solution was 1:9.

[0064] Step A2: Add 0.04 mol of maleic anhydride to a four-necked flask equipped with a thermometer, condenser and mechanical stirrer, heat to 120℃ and stir for 15 min, then cool to 90℃ and add 0.02 mol of the compound and mix well, then add 20 mL of tetrahydrofuran and react for 5 h, rotary evaporate and dry to obtain the preproduct.

[0065] Step A3: Mix 0.2 mol of 2,4-dihydroxybenzophenone, 0.2 mol of preproduct and 20 mL of N,N-dimethylformamide evenly, react at 100°C for 3 h under nitrogen protection, cool to room temperature, filter, wash and dry to obtain the modified anti-aging agent;

[0066] The modified flame retardant is prepared by the following method:

[0067] Step B1: Mix 0.02 mol m-chloroaniline and 300 mL ethanol at 80 °C until homogeneous, then add 0.02 mol benzaldehyde and mix until homogeneous. React at 80 °C for 8 h, cool to room temperature, filter, wash, and vacuum dry for 24 h to obtain intermediate 1.

[0068] Step B2: Mix 0.2 mol of intermediate 1, 0.1 mol of phenylboronic acid and 300 mL of N,N-dimethylformamide, react at 100 °C for 10 h, cool to room temperature, filter, wash and dry to obtain intermediate 2;

[0069] Step B3: Mix 0.04 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 300 mL of ethanol at 80 °C until homogeneous. Under magnetic stirring, slowly add 0.02 mol of intermediate 2 and react for 8 h. Filter, wash, and vacuum dry for 24 h to obtain the modified flame retardant.

[0070] Comparative Example 1: This comparative example is a photovoltaic cable resistant to photothermal aging. The difference between this example and Example 3 is that an equal amount of antioxidant 1010 is used instead of the modified aging resistant agent prepared in Example 3. All other aspects are the same.

[0071] Comparative Example 2: This comparative example is a photovoltaic cable resistant to photothermal aging. The difference between this example and Example 3 is that an equal amount of magnesium hydroxide is used instead of the modified flame retardant prepared in Example 3. All other aspects are the same.

[0072] Performance testing: The photovoltaic cables with photothermal aging resistance obtained in Examples 1-3 and Comparative Examples 1-2 were cut into standard test sizes; the samples were cut to a length of 100 mm and a width of 50 mm, and tested in an ultraviolet aging test chamber. Under 340 nm ultraviolet light irradiation, the samples were placed 20 cm away from the light source (500 W / m). 2 The sample was irradiated for 72 hours on a rotating sample holder (340 nm), and the color difference before and after the irradiation was measured. Tensile strength was tested according to GB / T1040.1-2018. Vertical burning performance was tested according to GB / T2408-2008. The test results are shown in Table 1 below.

[0073] Table 1

[0074]

[0075] As can be seen from the test data in Table 1, the photovoltaic cable resistant to photothermal aging prepared by the present invention has good resistance to ultraviolet radiation and thermal aging. Table 1 also shows that the photovoltaic cable resistant to photothermal aging prepared by the present invention has good flame retardant effect and tensile strength, and extends service life.

[0076] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A light-heat-aging-resistant photovoltaic cable, which is composed of a conductor core and an insulating layer, a filling layer and an outer sheath which are successively coated outside the conductor core, characterized in that, The outer sheath comprises the following raw materials by weight: Polyvinyl chloride resin 80-120 parts, modified anti-aging agent 3-5 parts, modified flame retardant 2-8 parts, dioctyl phthalate 1-3 parts, nano-silica 10-20 parts, butyl stearate 1-3 parts, zinc stearate 3-5 parts; The modified anti-aging agent is prepared by the following method: Step A1: 1, 3-dimethyl-6-amino urea pyrimidine and aqueous acetic acid are mixed uniformly under ultrasonic conditions, then formaldehyde is added, and the reaction is carried out at 35℃ for 24h under nitrogen protection. After the reaction is completed, it is cooled to room temperature, filtered, washed, and dried at 60℃ for 24h to obtain the compound. Step A2: Maleic anhydride is added to a four-necked flask equipped with a thermometer, a condenser and a mechanical stirring device, and stirred at 120℃ for 15min, then cooled to 90℃, and the compound is added and mixed uniformly, then tetrahydrofuran is added and reacted for 5h, then rotary evaporated, dried to obtain the pre-product. Step A3: 2, 4-dihydroxybenzophenone, the pre-product and N, N-dimethylformamide are mixed uniformly, and the reaction is carried out at 80-100℃ for 3h under nitrogen protection, then cooled to room temperature, filtered, washed and dried to obtain the modified anti-aging agent. The modified flame retardant is prepared by the following method: Step B1: m-Chloroaniline and ethanol are mixed uniformly at 80℃, then benzaldehyde is added and mixed uniformly, and the reaction is carried out at 80℃ for 8h, then cooled to room temperature, filtered, washed and dried at vacuum for 24h to obtain the intermediate 1. Step B2: The intermediate 1, phenylboronic acid and N, N-dimethylformamide are mixed and reacted at 50-100℃ for 5-10h, then filtered, washed and dried after cooling to room temperature to obtain the intermediate 2. Step B3: 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and ethanol are mixed uniformly at 80℃, then the intermediate 2 is slowly added under magnetic stirring, and the reaction is carried out for 8h, then filtered, washed and dried at vacuum for 24h to obtain the modified flame retardant.

2. A photovoltaic cable resistant to light and heat ageing according to claim 1, characterised in that, The conductor core is a copper conductor core.

3. A photovoltaic cable resistant to light and heat ageing according to claim 1, characterised in that, In step A1, the amount ratio of 1, 3-dimethyl-6-amino urea pyrimidine, aqueous acetic acid and formaldehyde is 0.02-0.04mol: 30mL: 0.01-0.02mol, and the volume ratio of acetic acid and deionized water in aqueous acetic acid is 1:

9.

4. A photovoltaic cable resistant to light and heat ageing according to claim 1, characterised in that, In step A2, the amount ratio of maleic anhydride, the compound and tetrahydrofuran is 0.02-0.04mol: 0.01-0.02mol: 10-20mL.

5. A photovoltaic cable resistant to light and heat ageing according to claim 1, characterised in that, In step A3, the amount ratio of 2, 4-dihydroxybenzophenone, the pre-product and N, N-dimethylformamide is 0.1-0.2mol: 0.1-0.2mol: 10-20mL.

6. A photovoltaic cable resistant to light and thermal ageing according to claim 1, characterised in that, In step B1, the amount ratio of m-chloroaniline, ethanol and benzaldehyde is 0.01-0.02mol: 300mL: 0.01-0.02mol.

7. A photovoltaic cable resistant to light and thermal ageing according to claim 1, characterised in that, In step B2, the amount ratio of the intermediate 1, phenylboronic acid and N, N-dimethylformamide is 0.1-0.2mol: 0.05-0.1mol: 150-300mL.

8. A photovoltaic cable resistant to light and thermal ageing according to claim 1, characterised in that, The ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, ethanol and intermediate 2 in step B3 is 0.02-0.04 mol: 300 mL: 0.01-0.02 mol.

9. A process for the preparation of a photovoltaic cable resistant to light thermal ageing according to any one of claims 1-8, characterized in that, The method comprises the following steps: S1, the raw materials are weighed by weight parts, the polyvinyl chloride resin, the modified anti-aging agent, the modified flame retardant, dioctyl phthalate, nano silicon dioxide, butyl stearate and zinc stearate are mixed at a high speed of 2000 rpm for 5 min, extruded, cooled and cut into particles to obtain an outer sheath; S2, the conductor core is extruded with polyethylene to form an insulation layer, the insulation layer is filled with polypropylene to form a filling layer, and the outer sheath is extruded on the surface of the filling layer and cooled and solidified to obtain a light and heat aging resistant photovoltaic cable.

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