Anti-aging corrosion-resistant photovoltaic cable

Abstract

The invention relates to the technical field of industrial production, and discloses an anti-aging corrosion-resistant photovoltaic cable, which comprises an insulating layer, uniformly distributed conductors are arranged on the inner diameter of the insulating layer, an insulating layer is arranged on the outer diameter of the insulating layer, a protective layer is arranged on the outer diameter of the insulating layer, and a sheath layer is arranged on the outer diameter of the protective layer. Reinforcing layers which are uniformly distributed are arranged between the sheath layer and the protective layer, the reinforcing layers are uniformly arranged and spirally wound on the surface of the protective layer, the insulating layer is made of a modified polyolefin material, and the protective layer is formed by blending fluoroplastic and an anti-aging additive. By adopting a multi-layer structure, the antioxidant can capture free radicals generated by thermo-oxidative aging, the 2-hydroxy-4-n-octyloxybenzophenone can absorb ultraviolet rays to reduce photo-oxidative damage, the protective layer contains a hindered amine light stabilizer and can circularly capture the free radicals and regenerate antioxidant groups, and the sheath layer contains polytetrafluoroethylene micro powder and prevents corrosion medium permeation. And the comprehensive effects of aging resistance and corrosion resistance are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial production, in particular to an anti-aging and corrosion-resistant photovoltaic cable. BACKGROUND

[0002] The photovoltaic cable is a key wire connecting various components in the photovoltaic system, and plays an important role in transmitting electric energy. Its performance is directly related to the stability and efficiency of the entire photovoltaic system. In industrial production, when the photovoltaic system is used to power the stamping die, the photovoltaic cable needs to adapt to the working environment of the stamping die. It not only needs to meet the basic requirements of power transmission, but also needs to have the ability to cope with complex working conditions. During the operation of the stamping die, it often accompanies complex working conditions such as high temperature, mechanical vibration and metal debris flying. The photovoltaic cable that powers it needs to work in such harsh environments for a long time. It not only needs to ensure stable power transmission, but also needs to withstand the erosion of various external factors. Therefore, it puts forward very high requirements for the performance of the cable. Once the performance of the cable declines or is damaged, it may cause the stamping die to stop, affecting the production progress, and even causing safety accidents.

[0003] However, the existing photovoltaic cable for stamping die has obvious deficiencies in anti-aging and corrosion resistance. The materials used in the insulation layer, protective layer and sheath layer of ordinary cables lack effective synergistic anti-aging and corrosion resistance mechanism. The insulation layer is difficult to resist thermal oxidative aging and light aging at the same time. The anti-aging chain of the protective layer is incomplete and cannot cope with the continuous attack of free radicals for a long time. The sheath layer also cannot form an effective physical barrier to block the penetration of corrosive media. In the high temperature and complex corrosion environment of the stamping die, these cables are prone to aging and cracking, and their performance decays, greatly shortening their service life, increasing maintenance costs and safety hazards. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides an anti-aging and corrosion-resistant photovoltaic cable, which solves the problem of obvious deficiencies in anti-aging and corrosion resistance of photovoltaic cables.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: an anti-aging and corrosion-resistant photovoltaic cable, comprising an insulation layer, the insulation layer is provided with uniformly distributed conductors in the inner diameter, the insulation layer is provided with an insulating layer in the outer diameter, the insulating layer is provided with a protective layer in the outer diameter, the protective layer is provided with a sheath layer in the outer diameter, the sheath layer and the protective layer are provided with uniformly distributed reinforcing layers, the reinforcing layers are uniformly arranged and spirally wound on the surface of the protective layer. The insulation layer is a modified polyolefin material, the protective layer is a blend of fluoroplastic and anti-aging additives, the protective layer is a corrosion-resistant polyamide composite material, and the sheath layer is a corrosion-resistant polyamide composite material.

[0006] Preferably, the gap between the insulating layer and the conductor is filled with a water-resistant gel comprising the following ingredients in parts by weight: butyl rubber base 60-70 parts, water-absorbing resin 15-20 parts, nano-montmorillonite 3-5 parts, antioxidant 0.5-1 part.

[0007] Preferably, the modified polyolefin material of the insulating layer comprises the following ingredients in parts by weight: ethylene-vinyl acetate copolymer 80-90 parts; antioxidant 1-3 parts; 2-hydroxy-4-n-octyloxybenzophenone 0.5-2 parts; nano-magnesium hydroxide 5-10 parts; maleic anhydride grafted polyethylene 2-5 parts.

[0008] Preferably, the cross-linked polyethylene material of the insulating layer comprises the following ingredients in parts by weight: low-density polyethylene 70-80 parts; triallyl isocyanurate 3-5 parts; dicumyl peroxide 0.5-1 part; nano-silicon dioxide 2-4 parts; zinc stearate 0.3-0.8 part.

[0009] Preferably, the fluoroplastic and anti-aging additive blended material of the protective layer comprises the following ingredients in parts by weight: polytetrafluoroethylene 60-70 parts; polyvinylidene fluoride 20-30 parts; hindered amine light stabilizer 1.5-3 parts; phosphite antioxidant 0.8-1.5 parts; carbon fiber 5-8 parts.

[0010] Preferably, the corrosion-resistant polyamide composite material of the sheath layer comprises the following ingredients in parts by weight: polyamide 65-75 parts; glass fiber 15-20 parts; polytetrafluoroethylene micro powder 5-10 parts; copper ion inhibitor 0.5-1.5 parts; ultraviolet absorber 0.8-2 parts.

[0011] Preferably, the reinforcing layer is composed of galvanized high-carbon steel wire bundle, wound equidistantly at a spiral angle of 55°-65°, and the surface of the reinforcing layer is provided with a polymer adhesive layer, and the surface of the adhesive layer is coated with a silane coupling agent composite coating.

[0012] Preferably, the insulation layer and the sheath layer are formed by a double-layer co-extrusion process, and the extrusion temperature is controlled as follows: the insulation layer is 180-190 DEG C, and the sheath layer is 195-205 DEG C.

[0013] Preferably, the conductor is twisted by multiple strands of tinned copper wires, the copper wires are subjected to annealing treatment, and the tinning layer is a bright plating layer; the multiple strands of copper wires are arranged in a concentric layer.

[0014] Preferably, the outer surface of the insulation layer is subjected to corona treatment, and the protective layer is coated on the outer surface of the insulation layer by an extrusion process, so that the two form a continuous and gapless combined structure.

[0015] The application provides an anti-aging and corrosion-resistant photovoltaic cable. 1. Since the application adopts a multi-layer structure, the insulation layer contains an antioxidant and 2-hydroxy-4-n-octyloxybenzophenone, the antioxidant can capture free radicals generated by thermal oxidative aging, the 2-hydroxy-4-n-octyloxybenzophenone can absorb ultraviolet rays to reduce photo-oxidation damage, the protective layer contains a hindered amine light stabilizer, which can cyclically capture free radicals and regenerate antioxidant groups, thereby enhancing the anti-aging chain, and the sheath layer contains polytetrafluoroethylene powder, which hinders the penetration of corrosive media, so that the comprehensive effects of anti-aging and corrosion resistance are achieved.

[0016] 2. In the application, the surface of the reinforcing layer is provided with a polymer adhesive layer and a silane coupling agent composite coating, and the outer surface of the insulation layer is subjected to corona treatment, so that the interlayer adhesion is enhanced, the polymer adhesive layer and the silane coupling agent composite coating improve the connection tightness of the reinforcing layer and the sheath layer, the corona treatment increases the polarity and roughness of the surface of the insulation layer, the protective layer and the insulation layer are combined more firmly, the influence of gaps and abrasion is reduced, the invasion of corrosive media is prevented, and the effects of improving the structural stability and durability of the cable are achieved.

[0017] 3. In the application, the insulation layer and the sheath layer are formed by a double-layer co-extrusion process, and the extrusion temperature and other parameters are optimized, so that the molten insulation layer and sheath layer material are combined synchronously in the extrusion process, the interlayer interface defects caused by step-by-step forming are reduced, and the possibility of diffusion of aging media and corrosive media through the interface is reduced, so that the effects of improving the overall performance of the cable and prolonging the service life are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a perspective view of the anti-aging and corrosion-resistant photovoltaic cable of the application; Figure 2 It is a schematic view of the anti-aging and corrosion-resistant photovoltaic cable of the application; Figure 3 It is a schematic view of the anti-aging and corrosion-resistant photovoltaic cable of the application.

[0019] 1, sheath layer; 2, reinforcing layer; 3, protective layer; 4, insulation layer; 5, insulation layer; 6, conductor. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0021] Preparation Example 1 Preparation of water-blocking gel: take butyl rubber base material, water-absorbing resin, nano-montmorillonite, antioxidant, and add the above raw materials into a mixing machine, stir and mix at 80-100℃ for 30-60 minutes to obtain the water-blocking gel.

[0022] Preparation Example 2 Preparation of insulation layer material: take ethylene-vinyl acetate copolymer, antioxidant, 2-hydroxy-4-n-octyloxybenzophenone, nano-magnesium hydroxide, and maleic anhydride grafted polyethylene, and add these raw materials into a twin-screw extruder for melt blending and extrusion at 160-180℃ to obtain the modified polyolefin material of the insulation layer.

[0023] Preparation Example 3 Preparation of insulation layer material: take low-density polyethylene, triallyl isocyanurate, dicumyl peroxide, nano-silicon dioxide, and zinc stearate, and add them into a mixing device for thorough mixing, then put them into an extruder for extrusion at 170-190℃ to obtain the cross-linked polyethylene material of the insulation layer.

[0024] Preparation Example 4 Preparation of protective layer material: take polytetrafluoroethylene, polyvinylidene fluoride, hindered amine light stabilizer, phosphite antioxidant, and carbon fiber, and mix these raw materials uniformly in a high-speed mixer, then melt blend at 200-220℃ to obtain the fluoroplastic and anti-aging additive blended material of the protective layer.

[0025] Preparation Example 5 Preparation of sheath layer material: take polyamide, glass fiber, polytetrafluoroethylene powder, copper ion inhibitor, and ultraviolet absorber, mix them, then add them into a twin-screw extruder for extrusion and granulation at 230-250℃ to obtain the corrosion-resistant polyamide composite material of the sheath layer.

[0026] Preparation Example 6 Preparation of reinforcing layer: select galvanized high-carbon steel wire bundle, coat a polymer bonding layer on the surface of the wire bundle, dry the bonding layer, then coat a silane coupling agent composite coating on the surface of the wire bundle, and dry to obtain the reinforcing layer.

[0027] The application will be further described in detail below with reference to the accompanying drawings Figure 1 to the accompanying drawings Figure 3 and examples Example 1 Firstly, the conductor 6 is prepared by arranging a plurality of annealed tinned copper wires in a right-twisted manner in concentric layers to form the conductor 6, and the tinning layer is a bright plating layer. Then, the water-blocking gel prepared in Preparation Example 1 according to 60 parts of butyl rubber base, 15 parts of water-absorbing resin, 3 parts of nano-montmorillonite, and 0.5 parts of antioxidant is filled in the gap between the outer surface of the conductor 6 and the subsequent insulating layer 5 and the conductor 6. Then, the modified polyolefin material prepared in Preparation Example 2 according to 80 parts of ethylene-vinyl acetate copolymer, 1 part of antioxidant, 0.5 part of 2-hydroxy-4-n-octyloxybenzophenone, 5 parts of nano-magnesium hydroxide, and 2 parts of maleic anhydride grafted polyethylene is coated on the outer surface of the conductor 6 by an extruder at 180°C to form the insulating layer 5. Subsequently, the crosslinked polyethylene material prepared in Preparation Example 3 according to 70 parts of low-density polyethylene, 3 parts of triallyl isocyanurate, 0.5 parts of dicumyl peroxide, 2 parts of nano-silicon dioxide, and 0.3 parts of zinc stearate is extruded on the outer surface of the insulating layer 5 to form the barrier layer 4, and the outer surface of the barrier layer 4 is subjected to corona treatment. Then, the fluoroplastic and anti-aging additive blended material prepared in Preparation Example 4 according to 60 parts of polytetrafluoroethylene, 20 parts of polyvinylidene fluoride, 1.5 parts of hindered amine light stabilizer, 0.8 parts of phosphite antioxidant, and 5 parts of carbon fiber is coated on the outer surface of the barrier layer 4 by an extrusion process to form the protective layer 3, so as to ensure that the two form a continuous and gap-free combined structure. Subsequently, the reinforcing layer 2 prepared in Preparation Example 6 is wound on the surface of the protective layer 3 at an equal distance with a spiral angle of 55°. Finally, the corrosion-resistant polyamide composite material prepared in Preparation Example 5 according to 65 parts of polyamide, 15 parts of glass fiber, 5 parts of polytetrafluoroethylene powder, 0.5 parts of copper ion inhibitor, and 0.8 parts of ultraviolet absorber is extruded on the outer surface of the reinforcing layer 2 at 195°C by a double-layer co-extrusion process with the insulating layer 5 to form the sheath layer 1, thereby completing the preparation of the entire photovoltaic cable.

[0028] Example 2 Firstly, the conductor 6 is prepared by arranging a plurality of annealed tinned copper wires in a right-twisted manner in concentric layers to form the conductor 6, and the tinning layer is a bright plating layer. Then, the water-blocking gel prepared in Preparation Example 1 according to 65 parts of butyl rubber base, 17 parts of water-absorbing resin, 4 parts of nano-montmorillonite, and 0.7 parts of antioxidant is filled in the gap between the outer surface of the conductor 6 and the subsequent insulating layer 5 and the conductor 6. Then the modified polyolefin material prepared in Preparation Example 2 according to ethylene-vinyl acetate copolymer 85 parts, antioxidant 2 parts, 2-hydroxy-4-n-octyloxy benzophenone 1 part, nano-magnesium hydroxide 7 parts, maleic anhydride grafted polyethylene 3 parts is used to coat the conductor 6 outside through an extruder at 185°C to form the insulation layer 5; Then the cross-linked polyethylene material prepared in Preparation Example 3 according to low-density polyethylene 75 parts, triallyl isocyanurate 4 parts, dicumyl peroxide 0.7 parts, nano-silicon dioxide 3 parts, zinc stearate 0.5 parts is used to extrude the insulation layer 5 outside to form the barrier layer 4, and the outer surface of the barrier layer 4 is subjected to corona treatment; Then the fluoroplastic and anti-aging additive blended material prepared in Preparation Example 4 according to polytetrafluoroethylene 65 parts, polyvinylidene fluoride 25 parts, hindered amine light stabilizer 2 parts, phosphite antioxidant 1 part, carbon fiber 6 parts is used to coat the outer surface of the barrier layer 4 through an extrusion process to form the protective layer 3, so that the two form a continuous and gapless combined structure; Subsequently, the reinforcing layer 2 prepared in Preparation Example 6 is wound on the surface of the protective layer 3 at an equal distance with a 60° spiral angle; Finally, the corrosion-resistant polyamide composite material prepared in Preparation Example 5 according to polyamide 70 parts, glass fiber 17 parts, polytetrafluoroethylene powder 7 parts, copper ion inhibitor 1 part, and ultraviolet absorber 1.5 parts is used to coat the reinforcing layer 2 outside through a double-layer co-extrusion process at 200°C to form the sheath layer 1, and the preparation of the photovoltaic cable is completed.

[0029] Example 3 An anti-aging and corrosion-resistant photovoltaic cable is prepared by first preparing a conductor 6, arranging a plurality of annealed tin-plated copper wires in a right-twisted arrangement according to concentric layers to form the conductor 6, and the tin-plated layer is a bright plating layer; Then the water-blocking gel prepared in Preparation Example 1 according to butyl rubber base 70 parts, water-absorbing resin 20 parts, nano-montmorillonite 5 parts, and antioxidant 1 part is used to fill the gap between the outer surface of the conductor 6 and the insulation layer 5 and the conductor 6; Then the modified polyolefin material prepared in Preparation Example 2 according to ethylene-vinyl acetate copolymer 90 parts, antioxidant 3 parts, 2-hydroxy-4-n-octyloxy benzophenone 2 parts, nano-magnesium hydroxide 10 parts, and maleic anhydride grafted polyethylene 5 parts is used to coat the conductor 6 outside through an extruder at 190°C to form the insulation layer 5; Then the cross-linked polyethylene material prepared in Preparation Example 3 according to low-density polyethylene 80 parts, triallyl isocyanurate 5 parts, dicumyl peroxide 1 part, nano-silicon dioxide 4 parts, and zinc stearate 0.8 parts is used to extrude the insulation layer 5 outside to form the barrier layer 4, and the outer surface of the barrier layer 4 is subjected to corona treatment; Then the fluoroplastic and anti-aging additive blending material prepared in the preparation example 4 with polytetrafluoroethylene 70 parts, polyvinylidene fluoride 30 parts, hindered amine light stabilizer 3 parts, phosphite antioxidant 1.5 parts, carbon fiber 8 parts, is coated on the outer surface of the insulation layer 4 by extrusion process to form the protective layer 3, ensuring the two form a continuous and gapless combination structure; Then the reinforcing layer 2 prepared in the preparation example 6 is spirally wound on the surface of the protective layer 3 at an equal interval of 65°; Finally, the corrosion-resistant polyamide composite material prepared in the preparation example 5 with polyamide 75 parts, glass fiber 20 parts, polytetrafluoroethylene powder 10 parts, copper ion inhibitor 1.5 parts, and ultraviolet absorber 2 parts is extruded on the outer surface of the reinforcing layer 2 at 205°C by double-layer co-extrusion process to form the sheath layer 1, completing the preparation of the entire photovoltaic cable.

[0030] Comparative Example 1 Compared with Example 3, the difference lies in that the 2-hydroxy-4-n-octyloxybenzophenone is not added in the modified polyolefin material of the insulation layer 5, and the rest of the raw materials and processes are the same.

[0031] Comparative Example 2 Compared with Example 3, the difference lies in that the hindered amine light stabilizer is not added in the fluoroplastic and anti-aging additive blending material of the protective layer 3, and the rest of the raw materials and processes are the same.

[0032] Comparative Example 3 Compared with Example 3, the difference lies in that the polytetrafluoroethylene powder is not added in the corrosion-resistant polyamide composite material of the sheath layer 1, and the rest of the raw materials and processes are the same.

[0033] Comparative Example 4 Compared with Example 3, the difference lies in that the polymer adhesive layer and the silane coupling agent composite coating are not set on the surface of the reinforcing layer 2, and the rest of the raw materials and processes are the same.

[0034] Comparative Example 5 Compared with Example 3, the difference lies in that the double-layer co-extrusion process is not used for the insulation layer 5 and the sheath layer 1, but they are extruded separately, and the rest of the raw materials and processes are the same.

[0035] Comparative Example 6 Compared with Example 3, the difference lies in that the outer surface of the insulation layer 4 is not subjected to corona treatment, and the rest of the raw materials and processes are the same.

[0036] Table 1, Anti-aging and Corrosion Resistance Test Data According to Table 1, the embodiments and the comparative examples have obvious differences in the two key performances of 150℃ heat aging tensile strength retention rate and corrosion degree in metal chip abrasion and salt spray combined test. The 150℃ heat aging tensile strength retention rate of the embodiments is generally higher than that of the comparative examples, among which the retention rate of Example 3 is the highest, indicating that its anti-aging performance is the best. In terms of corrosion degree in metal chip abrasion and salt spray combined test, the embodiments are generally better than the comparative examples. The corrosion degree of Example 3 is 0 level, which reflects more excellent corrosion resistance. This shows that the raw material ratio and preparation method adopted in the present application can effectively improve the comprehensive performance of the photovoltaic cable for stamping die, especially the formula and process of Example 3, which performs best in the balance of anti-aging and corrosion resistance.

[0037] The 150℃ heat aging tensile strength retention rate in the table is a key indicator of the anti-aging performance of the material (%). The larger the value, the better the anti-aging performance. The corrosion degree in metal chip abrasion and salt spray combined test is an indicator of the corrosion resistance of the material (level). The lower the level, the better the corrosion resistance.

[0038] The 150℃ heat aging tensile strength retention rate of Example 3 in Examples 1 to 3 is as high as 90%, and the corrosion degree in metal chip abrasion and salt spray combined test is 0 level. The synergistic effect of the antioxidant in the insulation layer, 2-hydroxy-4-n-octyloxybenzophenone, and the hindered amine light stabilizer in the protective layer, and the polytetrafluoroethylene micro powder in the sheath layer is significant. The antioxidant and 2-hydroxy-4-n-octyloxybenzophenone in the insulation layer play the role of antioxidant and ultraviolet absorption to ensure the stability of the insulation. The hindered amine light stabilizer in the protective layer captures free radicals to enhance the anti-aging ability. The polytetrafluoroethylene micro powder in the sheath layer forms a physical barrier to improve the corrosion resistance. The processes such as corona treatment of the separation layer, double-layer co-extrusion, and surface treatment of the reinforcing layer further strengthen the overall performance.

[0039] In Comparative Examples 1 and 2, the 150℃ heat aging tensile strength retention rate is 68%-84%, and the corrosion degree in metal chip abrasion and salt spray combined test is 1 level. Because the insulation layer lacks 2-hydroxy-4-n-octyloxybenzophenone or the protective layer lacks hindered amine light stabilizer, the anti-aging system is incomplete, which cannot effectively resist the erosion of aging factors, resulting in unsatisfactory anti-aging performance and corrosion resistance.

[0040] In Comparative Example 3, the 150℃ heat aging tensile strength retention rate is 85%, and the corrosion degree in metal chip abrasion and salt spray combined test is 2 level, which is significantly worse than Example 3. Because the sheath layer lacks polytetrafluoroethylene micro powder, it cannot form an effective physical barrier, and corrosive media can easily invade, resulting in a significant decrease in corrosion resistance, which also affects the overall anti-aging performance.

[0041] The tensile strength retention rate of Comparative Example 4 after heat aging at 150°C is 84%, and the corrosion degree in the metal chip abrasion and salt spray combined test is level 1. Although the anti-aging performance is slightly better than that of some comparative examples, the corrosion resistance is still insufficient. Because the surface of the reinforcing layer is not provided with a polymer adhesive layer and a silane coupling agent composite coating, the reinforcing layer and the sheath layer are not tightly combined, and gaps are easily generated during abrasion, which provides an opportunity for corrosive media.

[0042] The tensile strength retention rate of Comparative Example 5 after heat aging at 150°C is 82%, and the corrosion degree in the metal chip abrasion and salt spray combined test is level 1. Because the insulation layer and the sheath layer are not subjected to a double-layer co-extrusion process, there are interface defects between the layers, and the aging medium and corrosive medium can easily diffuse through the defects, resulting in a decrease in the overall performance of the material.

[0043] The tensile strength retention rate of Comparative Example 6 after heat aging at 150°C is 83%, and the corrosion degree in the metal chip abrasion and salt spray combined test is level 1. Because the outer surface of the insulating layer is not subjected to a corona treatment, the adhesion between the protective layer and the insulating layer is weak, and gaps are easily generated between the layers, which allows heat and corrosive media to invade, affecting the anti-aging and corrosion resistance.

[0044] The stamping die of the stamping die of Comparative Examples 1 to 6 is applied to the stamping die, and the performance of the obtained cable is verified; The test equipment is a tensile testing machine, and the tensile strength retention rate of the material after heat aging at 150°C for 500 hours is measured; The metal chip abrasion and salt spray combined test uses a salt spray test chamber, and 0.1-0.3mm iron-based chips are introduced. After 168 hours in a 5% NaCl solution salt spray environment, the corrosion level is evaluated according to the corrosion degree grading standard; According to the data in the table and the above analysis, Example 3 is the most preferred, with the best anti-aging performance, effectively resisting high-temperature aging during the operation of the stamping die, prolonging the service life of the cable, and having the best corrosion resistance, capable of withstanding the corrosive environment around the die, reducing corrosion damage, meeting the high-performance requirements of the stamping die for the cable, and significantly improving the operation stability and economy of the stamping die.

[0045] After 500 hours of heat aging at 150°C, the overall tensile strength retention rate is detected: from each of the examples and comparative examples involved in Table 1, the cable sample with the same length and cross-sectional specification is selected, and the impurities on the surface of the sample are removed; Initial tensile strength test is performed on the sample using a tensile testing machine, and the initial value is recorded. Then, the sample is placed in a constant temperature aging oven at 150℃ for 500 hours, with the temperature strictly controlled within ±2℃. After aging, the sample is taken out and cooled for 2 hours at room temperature. Then, the same tensile testing machine is used to measure the tensile strength according to the same parameters as the initial test, with a tensile speed of 50mm / min. Finally, the overall tensile strength retention rate is calculated by the formula: (tensile strength after aging / initial tensile strength) x 100%.

[0046] This test is mainly based on GB / T2951.12-2008 Cable and optical cable insulation and sheath materials General test methods Part 12: General test methods Heat aging test method. Considering that the actual working temperature of the stamping die cable is usually 100-120℃, in order to shorten the test period and enhance the evaluation of the cable's anti-aging performance, the aging temperature is increased to 150℃, and the aging time is set to 500 hours, so as to fully reflect the long-term anti-aging characteristics of the cable material.

[0047] After 1000 hours of QUV aging test, the overall appearance color difference ΔE detection is performed: representative cable segments are selected from each sample as test samples, which are placed in the QUV aging test box, and the test parameters are set. UVB-313 lamp is used, with an irradiance of 0.71W / m 2 , and the test is performed in a mode of 4 hours of ultraviolet irradiation and 4 hours of condensation, with a total duration of 1000 hours. After the test is completed, the test sample is taken out, and the color difference instrument is used to measure the overall appearance color difference ΔE of the test sample, which reflects the color change degree of the cable after aging.

[0048] Referring to GB / T16422.3-2014 Plastics Laboratory Light Source Exposure Test Method Part 3: Fluorescent Ultraviolet Lamp, and considering the ultraviolet radiation environment that the stamping die cable may be subjected to outdoors and around the die, the specific parameters of this test are developed to evaluate the appearance aging degree of the cable under the action of long-term ultraviolet radiation.

[0049] After 168 hours of 5% sodium chloride solution salt spray test, the overall corrosion degree detection is performed: a salt spray test box is prepared, and a 5% sodium chloride solution is configured, and the pH value of the solution is adjusted to 6.5-7.2. Cable samples are selected from each sample and fixed on the sample holder in the test box, so that the surface of the test sample forms an angle of 15°-30° with the vertical direction. The test box is started, and the salt spray deposition rate is set to 1-2mL / (h•80cm 2), the temperature is kept at 35℃±2℃, and the test lasts for 168 hours. After the test, the sample is taken out, the surface residual salt spray is washed with deionized water, and dried at room temperature for 24 hours. Finally, according to the preset overall corrosion degree grading standard, 0 level is no corrosion, 1 level is slight corrosion, and 2 level is obvious corrosion, the sample is rated.

[0050] Based on the standard of GB / T10125-2021 Salt Spray Test for Artificial Atmosphere Corrosion Test, the standard specifies the basic parameters of salt spray test, and the detection strictly follows these basic parameters to evaluate the corrosion resistance of the cable in the salt spray environment.

[0051] 5% sodium chloride solution immersion for 168 hours overall mass loss rate detection: the same length and cross-section of cable samples are taken from each sample, the samples are accurately weighed first, and the initial mass is recorded, then the samples are completely immersed in 5% sodium chloride solution, and placed at room temperature for 168 hours, after the test, the samples are taken out and washed with deionized water to remove the surface residual solution, dried to constant weight at room temperature, then weighed again, the overall mass loss rate is calculated by the formula: (initial mass-immersed mass) / initial mass×100%.

[0052] Referring to the test idea of material resistance to liquid corrosion in GB / T2951.51-2008 Cable and optical cable insulation and sheath materials General test methods Part 51: Filling paste special test methods Drop point, oil separation, low temperature brittleness, total acid value, insoluble content and corrosion, combined with the possible salt spray humid environment around the stamping die, the detection method is developed to evaluate the corrosion resistance of the cable in the salt solution immersion.

[0053] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. Anti-aging corrosion-resistant photovoltaic cable comprising an insulating layer (5), characterized in that: The insulating layer (5) is provided with uniformly distributed conductors (6) in the inner diameter, the insulating layer (5) is provided with an insulation layer (4) in the outer diameter, the insulation layer (4) is provided with a protective layer (3) in the outer diameter, the protective layer (3) is provided with a sheath layer (1) in the outer diameter, the sheath layer (1) and the protective layer (3) are provided with a uniformly distributed reinforcing layer (2) between them, the reinforcing layer (2) is uniformly arranged and spirally wound on the surface of the protective layer (3). The insulating layer (5) is a modified polyolefin material, the protective layer (3) is a fluoroplastic blended with an anti-aging additive, the protective layer (3) is a corrosion-resistant polyamide composite material, and the sheath layer (1) is a corrosion-resistant polyamide composite material.

2. An anti-aging corrosion resistant photovoltaic cable according to claim 1, characterized in that: The gap between the insulating layer (5) and the conductor (6) is filled with a water-blocking gel, and the water-blocking gel comprises the following raw materials by weight: Butyl rubber base 60-70 parts, water-absorbing resin 15-20 parts, nano-montmorillonite 3-5 parts, antioxidant 0.5-1 part.

3. The anti-aging corrosion resistant photovoltaic cable according to claim 1, wherein: The modified polyolefin material of the insulating layer (5) comprises the following raw materials by weight: Ethylene-vinyl acetate copolymer 80-90 parts; Antioxidant 1-3 parts; 2-hydroxy-4-n-octoxybenzophenone 0.5-2 parts; Nano-magnesium hydroxide 5-10 parts; Maleic anhydride grafted polyethylene 2-5 parts.

4. The anti-aging corrosion resistant photovoltaic cable of claim 1, wherein: The cross-linked polyethylene material of the insulation layer (4) comprises the following raw materials by weight: Low-density polyethylene 70-80 parts; Triallyl isocyanurate 3-5 parts; Dicumyl peroxide 0.5-1 part; Nano-silicon dioxide 2-4 parts; Zinc stearate 0.3-0.8 parts.

5. The anti-aging corrosion resistant photovoltaic cable according to claim 1, wherein: The fluoroplastic blended with an anti-aging additive of the protective layer (3) comprises the following raw materials by weight: Polytetrafluoroethylene 60-70 parts; Polyvinylidene fluoride 20-30 parts; Hindered amine light stabilizer 1.5-3 parts; Phosphite antioxidant 0.8-1.5 parts; Carbon fiber 5-8 parts.

6. The anti-aging, corrosion-resistant photovoltaic cable according to claim 1, characterized in that: The corrosion-resistant polyamide composite material of the sheath layer (1) comprises the following raw materials by weight: Polyamide 65-75 parts; Glass fiber 15-20 parts; Polytetrafluoroethylene powder 5-10 parts; Copper ion inhibitor 0.5-1.5 parts; Ultraviolet absorber 0.8-2 parts.

7. The anti-aging, corrosion-resistant photovoltaic cable according to claim 1, characterized in that: The reinforcing layer (2) is composed of galvanized high-carbon steel wire bundle, which is spirally wound at an equal distance with a spiral angle of 55-65°, and a polymer adhesive layer is provided on the surface of the reinforcing layer (2), and a silane coupling agent composite coating is coated on the surface of the adhesive layer.

8. The anti-aging, corrosion-resistant photovoltaic cable according to claim 1, characterized in that: The insulating layer (5) and the sheath layer (1) are formed by a double-layer co-extrusion process, and the extrusion temperature is controlled to be 180-190℃ for the insulating layer (5) and 195-205℃ for the sheath layer (1).

9. The anti-aging, corrosion-resistant photovoltaic cable of claim 1, wherein: The conductor (6) is composed of multiple strands of tinned copper wire, the copper wire is annealed, the tinning layer is a bright plating layer, and the multiple strands of copper wire are arranged in concentric layers.

10. The anti-aging, corrosion-resistant photovoltaic cable of claim 1, wherein: The outer surface of the insulation layer (4) is treated by corona, and the protective layer (3) is coated on the outer surface of the insulation layer (4) by an extrusion process, and the two form a continuous and gap-free combined structure.

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