Fluororubber material for desert armored photovoltaic cable and preparation method thereof

Abstract

The invention relates to the technical field of fluororubber, in particular to a fluororubber material for a desert armored photovoltaic cable and a preparation method of the fluororubber material. The fluororubber material for the desert armored photovoltaic cable is prepared from the following raw materials in parts by mass: 100 parts of fluororubber, 5 to 15 parts of methyl vinyl silicone rubber, 1 to 3 parts of compatilizer, 1 to 2 parts of composite vulcanizing agent, 40 to 60 parts of fumed silica, 1 to 4 parts of nano silicon dioxide, 10 to 30 parts of activated carbon fiber, 1 to 3 parts of polyethylene wax and 1 to 2 parts of calcium stearate. Wherein the fluororubber is a copolymer of polyvinylidene fluoride and perfluoropropylene. After the fluororubber is activated, the carbon fibers are promoted to be combined into a matrix, and the materials such as the methyl vinyl silicone rubber, the fumed silica and the nano silicon dioxide are matched, so that the wear resistance and the aging resistance are greatly improved, the mechanical property is excellent, and the cable material is used for protecting the cable and ensuring the safe operation of the cable. Meanwhile, the preparation method is simple and easy to implement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluororubber, and particularly relates to a fluororubber material for desert armored photovoltaic cable and a preparation method thereof. BACKGROUND

[0002] With the acceleration of global energy structure transformation, photovoltaic technology has become the core direction of green energy development. Desert areas, with their long average daily sunshine intensity, low vegetation coverage and vast land resources, have become an ideal site for large-scale photovoltaic power station construction.

[0003] However, the extreme characteristics of the desert environment pose a serious challenge to the supporting cable of the photovoltaic system: frequent sandstorms can wear the surface of the cable, and the intensity of ultraviolet radiation is extremely high, while the ground temperature in summer often exceeds 70 DEG C, and the diurnal temperature difference can reach 50 DEG C.

[0004] Current desert armored photovoltaic cable sheath materials mostly use ordinary PVC or low-density polyethylene, but their weather resistance, mechanical strength and anti-aging performance are difficult to meet the long-term service requirements. At present, under the action of sand wind erosion, cracks are easily generated on the surface of the sheath, which leads to the exposure of the insulation layer and causes the risk of short circuit; and the conventional rubber sheath softens and deforms at high temperatures, which causes the cable structure to be loose and affects the stability of power transmission; in the desert environment, high-intensity ultraviolet rays cause the high molecular chain to break, and the material becomes brittle and cracked, significantly shortening the service life of the system.

[0005] Fluororubber (FKM) has become the mainstream choice for photovoltaic cable sheath due to its high bond energy of C-F bond in the molecular chain and better heat resistance than traditional materials. However, the use of fluororubber alone still has the problem of easy cracking in extremely low temperature environment, and although it can be blended with fiber materials to improve low temperature brittleness, the fiber materials are prone to agglomeration in the system, which also causes poor improvement effect of mechanical properties.

[0006] Cable sheath material is the protective layer of the outer layer of the cable, and is used to protect the cable and ensure the safe operation of the cable. In view of the above problems, it is urgent to develop a sheath material with excellent mechanical properties, wear resistance, high temperature resistance and ultraviolet aging resistance to meet the harsh requirements of the desert environment. SUMMARY

[0007] The present application relates to the technical field of fluororubber, and particularly relates to a fluororubber material for desert armored photovoltaic cable and a preparation method thereof.

[0008] A fluororubber material for desert armored photovoltaic cables comprises, by weight, the following raw materials: 100 parts fluororubber, 5-15 parts methyl vinyl silicone rubber, 1-3 parts compatibilizer, 1-2 parts composite vulcanizing agent, 40-60 parts fumed silica, 1-4 parts nano silica, 10-30 parts activated carbon fiber, 1-3 parts polyethylene wax, and 1-2 parts calcium stearate; wherein the fluororubber is a copolymer of polyvinylidene fluoride and perfluoropropylene.

[0009] Preferably, the vinyl content in the methyl vinyl silicone rubber is 0.07-0.12%.

[0010] Preferably, the compatibilizer is silane coupling agent KH-560.

[0011] Preferably, the composite vulcanizing agent includes N,N'-biscinnamaldehyde-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide.

[0012] More preferably, the mass ratio of N,N'-biscinnamaldehyde-1,6-hexanediamine to 2-mercaptobenzothiazole is 1:0.1-0.5:0.1-0.3.

[0013] Preferably, the activated carbon fiber is prepared by the following steps: plasma treatment of the carbon fiber with a mixture of oxygen and argon for 10-20 minutes, with a plasma treatment power of 400-500W; immersion in an ethanol solution containing 3-aminopropyltriethoxysilane, stirring at 80-90℃ for 1-2 hours, filtering, and drying.

[0014] More preferably, the volume ratio of oxygen to argon is 1:4-6.

[0015] More preferably, the mass ratio of carbon fiber to 3-aminopropyltriethoxysilane is 10-20:0.3-0.8.

[0016] The preparation method of the above-mentioned fluororubber material for desert armored photovoltaic cables includes the following steps: S1. Fluororubber is irradiated with ultraviolet light for 10-20 minutes, then soaked in sodium hydroxide solution, allowed to stand for 5-10 minutes, filtered, washed, and vacuum dried; the product is mixed with activated carbon fiber, polyethylene wax, and calcium stearate, and kneaded at 120-130℃ for 1-5 minutes to obtain compound a. S2. Mix methyl vinyl silicone rubber, fumed silica, nano silica, compatibilizer, and composite vulcanizing agent, and knead at 120-140℃ for 2-6 minutes. Then add compound a and continue kneading for 1-3 minutes to obtain compound b. Extrude and granulate.

[0017] Preferably, in S1, the ultraviolet wavelength is 254 nm and the ultraviolet irradiation intensity is 80-120 mW / cm². 2 .

[0018] Preferably, in S2, an extruder is used for extrusion granulation, and the temperatures of each zone of the extruder are as follows: Zone I 145-150℃, Zone II 170-175℃, Zone III 180-190℃, Zone IV 200-205℃, Zone V 210-220℃, and the die head 195-205℃.

[0019] Beneficial effects: This invention uses fluororubber (a copolymer of polyvinylidene fluoride and perfluoropropylene) as the matrix material and employs ultraviolet pre-irradiation treatment to form active sites on the surface of the fluororubber. This not only solves the problem of poor compatibility of traditional fluororubber, but also enhances the interfacial bonding strength with activated carbon fibers.

[0020] This invention utilizes carbon fibers that have undergone plasma treatment and modification with silane coupling agents to introduce a large number of oxygen-containing polar groups and amino groups on their surface. On the one hand, these groups can chemically bond with the molecular chains of fluororubber, effectively solving the problem of easy agglomeration of carbon fibers in the rubber matrix. On the other hand, they also avoid the processing difficulties caused by excessive aspect ratio. In the desert wind erosion environment, a three-dimensional network structure is formed, which can effectively disperse the impact stress of sand particles and significantly reduce the wear rate of cable surfaces.

[0021] This invention utilizes the synergistic effect of methyl vinyl silicone rubber and fluororubber. The side methyl groups of the silicone rubber can rotate freely, maintaining flexibility within a temperature range of -50℃ to 200℃, thus solving the low-temperature brittleness problem of fluororubber and significantly extending its service life. The composite vulcanization system employs N,N'-dicinnamyl-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide, creating a polysulfide crosslinking network that maintains structural stability at high temperatures. N,N-dicinnamyl-1,6-hexanediamine, as the main vulcanizing agent, has a rigid structure that inhibits chain slippage at high temperatures, while 2-mercaptobenzothiazole promotes uniformity of the vulcanization reaction. Combined with diisobutylthiuram disulfide, it increases the crosslinking density. The synergistic effect of these three components reduces the compression set of the material at 70℃.

[0022] This invention optimizes the formulation and process to activate fluororubber, thereby promoting the bonding of carbon fibers into the matrix. Combined with methyl vinyl silicone rubber, fumed silica, and nano-silica, this significantly improves the material's wear resistance and aging resistance while maintaining excellent mechanical properties. It is used to protect cables and ensure their safe operation. Furthermore, the preparation method of this invention is simple and easy to implement, making it suitable for large-scale application. Attached Figure Description

[0023] Figure 1 This is a comparison chart of the tensile strength and wear amount of the fluororubber material for desert armored photovoltaic cables obtained in Example 5 and Comparative Examples 1-2.

[0024] Figure 2 This is a comparison chart showing the change rate of tensile strength of the fluororubber materials for desert armored photovoltaic cables obtained in Example 5 and Comparative Examples 1-2 after thermal aging and UV aging. Detailed Implementation

[0025] The fluororubber used below was purchased from a Shanghai-based fluorochemical technology company, with the grade FE2602-1. The methyl vinyl silicone rubber used below was sourced from Dow Corning, with the grade RBG-0611 and a vinyl content of 0.11%. The fumed silica used below was purchased from a Shandong-based Laiyuan Chemical Co., Ltd., with a particle size of 10-50 nm. The carbon fiber used below was purchased from a Cangzhou-based Lixin New Materials Technology Co., Ltd.

[0026] The present invention will be further explained below with reference to specific embodiments.

[0027] Example 1 A fluororubber material for desert armored photovoltaic cables, the raw materials of which include: 100g fluororubber, 5g methyl vinyl silicone rubber, 1g KH-560 coupling agent, 1g composite vulcanizing agent, 40g fumed silica, 1g nano silica, 10g activated carbon fiber, 1g polyethylene wax, and 1g calcium stearate.

[0028] The composite vulcanizing agent is composed of N,N'-biscinnamaldehyde-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide in a mass ratio of 1:0.1:0.1.

[0029] Activated carbon fibers are prepared using the following steps: 10g of carbon fibers are placed in a plasma treatment device and subjected to plasma treatment for 10 minutes using a mixture of oxygen and argon in a volume ratio of 1:4 at a treatment power of 400W. The carbon fibers are then immersed in 30g of an ethanol solution containing 3-aminopropyltriethoxysilane (where the mass fraction of 3-aminopropyltriethoxysilane is 1%, and the ethanol solution is composed of ethanol and water in a mass ratio of 5:5). The mixture is stirred at 80℃ for 1 hour, filtered, washed, and vacuum dried.

[0030] The preparation method of the above-mentioned fluororubber material for desert armored photovoltaic cables includes the following steps: S1. Irradiate fluororubber under ultraviolet radiation for 10 minutes, where the irradiation intensity is 80 mW / cm². 2 The ultraviolet light wavelength is 254nm. The product is soaked in a 0.5mol / L sodium hydroxide solution, left to stand for 5 minutes, filtered, washed, and vacuum dried. The product, activated carbon fiber, polyethylene wax, and calcium stearate are added to No. 1 mixer and mixed at 120℃ for 1 minute to obtain mixture a. S2. Add methyl vinyl silicone rubber, fumed silica, nano silica, KH-560 coupling agent, and composite vulcanizing agent to No. 2 mixer and mix at 120℃ for 2 minutes. Then add mixture a and continue mixing for 1 minute to obtain mixture b. The compound b is fed into a twin-screw extruder for granulation. The temperatures of each zone of the extruder are as follows: Zone I 145℃, Zone II 170℃, Zone III 180℃, Zone IV 200℃, Zone V 210℃, and the die head 195℃.

[0031] Example 2 A fluororubber material for desert armored photovoltaic cables comprises the following raw materials: 100g fluororubber, 15g methyl vinyl silicone rubber, 3g KH-560 coupling agent, 2g composite vulcanizing agent, 60g fumed silica, 4g nano silica, 30g activated carbon fiber, 3g polyethylene wax, and 2g calcium stearate.

[0032] The composite vulcanizing agent is composed of N,N'-biscinnamaldehyde-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide in a mass ratio of 1:0.5:0.3.

[0033] Activated carbon fibers are prepared using the following steps: 20g of carbon fibers are placed in a plasma treatment device and subjected to plasma treatment for 20min using a mixture of oxygen and argon at a volume ratio of 1:6, with a treatment power of 500W. The carbon fibers are then immersed in 40g of an ethanol solution containing 3-aminopropyltriethoxysilane (where the mass fraction of 3-aminopropyltriethoxysilane is 2%, and the ethanol solution is composed of ethanol and water at a mass ratio of 7:3). The mixture is stirred at 90℃ for 2h, filtered, washed, and vacuum dried.

[0034] The preparation method of the above-mentioned fluororubber material for desert armored photovoltaic cables includes the following steps: S1. Irradiate fluororubber under ultraviolet radiation for 20 minutes, where the irradiation intensity is 120 mW / cm². 2 The ultraviolet light wavelength is 254nm. The product is soaked in a 1.2mol / L sodium hydroxide solution, left to stand for 10min, filtered, washed, and vacuum dried. The product, activated carbon fiber, polyethylene wax, and calcium stearate are added to No. 1 mixer and mixed at 130℃ for 5min to obtain mixture a. S2. Add methyl vinyl silicone rubber, fumed silica, nano silica, KH-560 coupling agent, and composite vulcanizing agent to No. 2 mixer and mix at 140℃ for 6 minutes. Then add mixture a and continue mixing for 3 minutes to obtain mixture b. The compound b is fed into a twin-screw extruder for granulation. The temperatures of each zone of the extruder are as follows: Zone I 150℃, Zone II 175℃, Zone III 190℃, Zone IV 205℃, Zone V 220℃, and the die head 205℃.

[0035] Example 3 A fluororubber material for desert armored photovoltaic cables comprises the following raw materials: 100g fluororubber, 8g methyl vinyl silicone rubber, 2.5g KH-560 coupling agent, 1.3g composite vulcanizing agent, 55g fumed silica, 2g nano silica, 25g activated carbon fiber, 1.5g polyethylene wax, and 1.5g calcium stearate.

[0036] The composite vulcanizing agent is composed of N,N'-biscinnamaldehyde-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide in a mass ratio of 1:0.4:0.2.

[0037] Activated carbon fibers are prepared using the following steps: 17g of carbon fibers are placed in a plasma treatment device and subjected to plasma treatment for 18 minutes using a mixture of oxygen and argon at a volume ratio of 1:4.5, with a treatment power of 420W. The carbon fibers are then immersed in 37g of an ethanol solution containing 3-aminopropyltriethoxysilane (where the mass fraction of 3-aminopropyltriethoxysilane is 1.5%, and the ethanol solution is composed of ethanol and water at a mass ratio of 5.5:4.5). The mixture is stirred at 82℃ for 100 minutes, filtered, washed, and vacuum dried.

[0038] The preparation method of the above-mentioned fluororubber material for desert armored photovoltaic cables includes the following steps: S1. Irradiate fluororubber under ultraviolet radiation for 12 minutes, where the irradiation intensity is 110 mW / cm². 2 The ultraviolet light wavelength is 254nm. The product is soaked in a 0.6mol / L sodium hydroxide solution, left to stand for 9 minutes, filtered, washed, and vacuum dried. The product, activated carbon fiber, polyethylene wax, and calcium stearate are added to No. 1 mixer and mixed at 122℃ for 4 minutes to obtain mixture a. S2. Add methyl vinyl silicone rubber, fumed silica, nano silica, KH-560 coupling agent, and composite vulcanizing agent to No. 2 mixer and mix at 125℃ for 5 minutes. Then add mixture a and continue mixing for 2 minutes to obtain mixture b. The compound b was fed into a twin-screw extruder for granulation. The temperatures of each zone of the extruder were as follows: Zone I 147℃, Zone II 173℃, Zone III 182℃, Zone IV 203℃, Zone V 212℃, and the die head 202℃.

[0039] Example 4 A fluororubber material for desert armored photovoltaic cables comprises the following raw materials: 100g fluororubber, 12g methyl vinyl silicone rubber, 1.5g KH-560 coupling agent, 1.7g composite vulcanizing agent, 45g fumed silica, 3g nano silica, 15g activated carbon fiber, 2.5g polyethylene wax, and 1.5g calcium stearate.

[0040] The composite vulcanizing agent is composed of N,N'-biscinnamaldehyde-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide in a mass ratio of 1:0.2:0.4.

[0041] Activated carbon fibers are prepared using the following steps: 13g of carbon fibers are placed in a plasma treatment device and subjected to plasma treatment for 12 minutes using a mixture of oxygen and argon at a volume ratio of 1:5.5, with a treatment power of 480W. The carbon fibers are then immersed in 33g of an ethanol solution containing 3-aminopropyltriethoxysilane (where the mass fraction of 3-aminopropyltriethoxysilane is 1.5%, and the ethanol solution is composed of ethanol and water at a mass ratio of 6.5:3.5). The mixture is stirred at 88℃ for 80 minutes, filtered, washed, and vacuum dried.

[0042] The preparation method of the above-mentioned fluororubber material for desert armored photovoltaic cables includes the following steps: S1. Irradiate fluororubber under ultraviolet radiation for 18 minutes, where the irradiation intensity is 90 mW / cm². 2 The ultraviolet light wavelength is 254nm. The product is soaked in a 1mol / L sodium hydroxide solution, left to stand for 7min, filtered, washed, and vacuum dried. The product, along with activated carbon fiber, polyethylene wax, and calcium stearate, is added to No. 1 mixer and mixed at 128℃ for 2min to obtain mixture a. S2. Add methyl vinyl silicone rubber, fumed silica, nano silica, KH-560 coupling agent, and composite vulcanizing agent to No. 2 mixer and mix at 135℃ for 3 minutes. Then add mixture a and continue mixing for 2 minutes to obtain mixture b. The compound b was fed into a twin-screw extruder for granulation. The temperatures of each zone of the extruder were as follows: Zone I 149℃, Zone II 171℃, Zone III 188℃, Zone IV 201℃, Zone V 218℃, and the die head 198℃.

[0043] Example 5 A fluororubber material for desert armored photovoltaic cables comprises the following raw materials: 100g fluororubber, 10g methyl vinyl silicone rubber, 2g KH-560 coupling agent, 1.5g composite vulcanizing agent, 50g fumed silica, 2.5g nano silica, 20g activated carbon fiber, 2g polyethylene wax, and 1.5g calcium stearate.

[0044] The composite vulcanizing agent is composed of N,N'-biscinnamaldehyde-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide in a mass ratio of 1:0.3:0.3.

[0045] Activated carbon fibers are prepared using the following steps: 15g of carbon fibers are placed in a plasma treatment device and subjected to plasma treatment for 15min using a mixture of oxygen and argon at a volume ratio of 1:5, with a treatment power of 450W. The carbon fibers are then immersed in 35g of an ethanol solution containing 3-aminopropyltriethoxysilane (where the mass fraction of 3-aminopropyltriethoxysilane is 1.5%, and the ethanol solution is composed of ethanol and water at a mass ratio of 6:4). The mixture is stirred at 85℃ for 90min, filtered, washed, and vacuum dried.

[0046] The preparation method of the above-mentioned fluororubber material for desert armored photovoltaic cables includes the following steps: S1. Irradiate fluororubber under ultraviolet radiation for 15 minutes, where the irradiation intensity is 100 mW / cm². 2 The ultraviolet light wavelength is 254nm. The product is soaked in a 0.8mol / L sodium hydroxide solution, left to stand for 8 minutes, filtered, washed, and vacuum dried. The product, activated carbon fiber, polyethylene wax, and calcium stearate are added to No. 1 mixer and mixed at 125℃ for 3 minutes to obtain mixture a. S2. Add methyl vinyl silicone rubber, fumed silica, nano silica, KH-560 coupling agent, and composite vulcanizing agent to No. 2 mixer and mix at 130℃ for 4 minutes. Then add mixture a and continue mixing for 2 minutes to obtain mixture b. The compound b is fed into a twin-screw extruder for granulation. The temperatures of each zone of the extruder are as follows: Zone I 148℃, Zone II 172℃, Zone III 185℃, Zone IV 202℃, Zone V 215℃, and the die head 200℃.

[0047] Comparative Example 1 A fluororubber material for desert armored photovoltaic cables comprises the following raw materials: 100g fluororubber, 10g methyl vinyl silicone rubber, 2g KH-560 coupling agent, 1.5g composite vulcanizing agent, 50g fumed silica, 2.5g nano silica, 20g activated carbon fiber, 2g polyethylene wax, and 1.5g calcium stearate.

[0048] The composite vulcanizing agent is composed of N,N'-biscinnamaldehyde-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide in a mass ratio of 1:0.3:0.3.

[0049] Activated carbon fibers are prepared using the following steps: 15g of carbon fibers are placed in a plasma treatment device and subjected to plasma treatment for 15min using a mixture of oxygen and argon at a volume ratio of 1:5, with a treatment power of 450W. The carbon fibers are then immersed in 35g of an ethanol solution containing 3-aminopropyltriethoxysilane (where the mass fraction of 3-aminopropyltriethoxysilane is 1.5%, and the ethanol solution is composed of ethanol and water at a mass ratio of 6:4). The mixture is stirred at 85℃ for 90min, filtered, washed, and vacuum dried.

[0050] The preparation method of the above-mentioned fluororubber material for desert armored photovoltaic cables includes the following steps: S1. Fluororubber, activated carbon fiber, polyethylene wax and calcium stearate are added to No. 1 mixer and mixed at 125℃ for 3 minutes to obtain mixture a. S2. Add methyl vinyl silicone rubber, fumed silica, nano silica, KH-560 coupling agent, and composite vulcanizing agent to No. 2 mixer and mix at 130℃ for 4 minutes. Then add mixture a and continue mixing for 2 minutes to obtain mixture b. The compound b is fed into a twin-screw extruder for granulation. The temperatures of each zone of the extruder are as follows: Zone I 148℃, Zone II 172℃, Zone III 185℃, Zone IV 202℃, Zone V 215℃, and the die head 200℃.

[0051] Comparative Example 2 A fluororubber material for desert armored photovoltaic cables comprises the following raw materials: 100g fluororubber, 10g methyl vinyl silicone rubber, 2g KH-560 coupling agent, 1.5g composite vulcanizing agent, 50g fumed silica, 2.5g nano silica, 20g activated carbon fiber, 2g polyethylene wax, and 1.5g calcium stearate.

[0052] The composite vulcanizing agent is composed of N,N'-biscinnamaldehyde-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide in a mass ratio of 1:0.3:0.3.

[0053] Activated carbon fibers are prepared by the following steps: 15g of carbon fibers are soaked in 35g of an ethanol solution containing 3-aminopropyltriethoxysilane (where the mass fraction of 3-aminopropyltriethoxysilane is 1.5%, and the ethanol solution is made by mixing ethanol and water in a mass ratio of 6:4), stirred at 85℃ for 90min, filtered, washed, and vacuum dried.

[0054] The preparation method of the above-mentioned fluororubber material for desert armored photovoltaic cables includes the following steps: S1. Irradiate fluororubber under ultraviolet radiation for 15 minutes, where the irradiation intensity is 100 mW / cm². 2The ultraviolet light wavelength is 254nm. The product is soaked in a 0.8mol / L sodium hydroxide solution, left to stand for 8 minutes, filtered, washed, and vacuum dried. The product, activated carbon fiber, polyethylene wax, and calcium stearate are added to No. 1 mixer and mixed at 125℃ for 3 minutes to obtain mixture a. S2. Add methyl vinyl silicone rubber, fumed silica, nano silica, KH-560 coupling agent, and composite vulcanizing agent to No. 2 mixer and mix at 130℃ for 4 minutes. Then add mixture a and continue mixing for 2 minutes to obtain mixture b. The compound b is fed into a twin-screw extruder for granulation. The temperatures of each zone of the extruder are as follows: Zone I 148℃, Zone II 172℃, Zone III 185℃, Zone IV 202℃, Zone V 215℃, and the die head 200℃.

[0055] The tensile strength of the fluororubber materials for desert armored photovoltaic cables obtained in Example 5 and Comparative Examples 1-2 was determined in accordance with GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber".

[0056] The wear amount of the fluororubber materials for desert armored photovoltaic cables obtained in Example 5 and Comparative Examples 1-2 was determined using an abrasion tester in accordance with GB / T 1689-2014 "Determination of abrasion resistance of vulcanized rubber (using Akron abrasion tester)".

[0057] like Figure 1 As shown, the fluororubber material for desert armored photovoltaic cables obtained in Example 5 has the highest tensile strength and the least wear, which is better than Comparative Examples 1-2 (P<0.05).

[0058] The tensile strength of the fluororubber materials for desert armored photovoltaic cables obtained in Example 5 and Comparative Examples 1-2 after heat aging at 150℃ for 240h was determined in accordance with GB / T 3512-2014 "Accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber in hot air". The change rate of tensile strength was calculated.

[0059] The tensile strength of the fluororubber materials for desert armored photovoltaic cables obtained in Example 5 and Comparative Examples 1-2 after 240 hours of ultraviolet aging was determined in accordance with GB / T 14522-2008 "Artificial Climate Accelerated Test Methods for Plastics, Coatings and Rubber Materials for Mechanical Industry Products". The change rate of tensile strength was calculated. The ultraviolet aging process was based on cycle 1 in Table 4 of GB / T 16422.3-2014 "Laboratory Light Source Exposure Test Methods for Plastics Part 3: Fluorescent Ultraviolet Lamps".

[0060] like Figure 2As shown, the tensile strength change rate of the fluororubber material for desert armored photovoltaic cables obtained in Example 5 was the smallest, which was better than that of Comparative Examples 1-2 (P<0.05), confirming the heat aging resistance and UV aging resistance of the present invention.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fluororubber material for desert armored photovoltaic cables, characterized in that, Its raw materials include, by weight, 100 parts of fluororubber, 5-15 parts of methyl vinyl silicone rubber, 1-3 parts of compatibilizer, 1-2 parts of composite vulcanizing agent, 40-60 parts of fumed silica, 1-4 parts of nano silica, 10-30 parts of activated carbon fiber, 1-3 parts of polyethylene wax, and 1-2 parts of calcium stearate. Fluororubber is a copolymer of polyvinylidene fluoride and perfluoropropylene.

2. The fluororubber material for desert armored photovoltaic cables according to claim 1, characterized in that, The vinyl content in methyl vinyl silicone rubber is 0.07-0.12%.

3. The fluororubber material for desert armored photovoltaic cables according to claim 1, characterized in that, The compatibilizer is silane coupling agent KH-560.

4. The fluororubber material for desert armored photovoltaic cables according to claim 1, characterized in that, The composite vulcanizing agents include N,N'-biscinnamaldehyde-1,6-hexanediamine, 2-mercaptobenzothiazole, and diisobutylthiuram disulfide; The mass ratio of N,N'-biscinnamaldehyde-1,6-hexanediamine and 2-mercaptobenzothiazole is 1:0.1-0.5:0.1-0.

3.

5. The fluororubber material for desert armored photovoltaic cables according to claim 1, characterized in that, Activated carbon fibers are prepared by the following steps: the carbon fibers are plasma treated with a mixture of oxygen and argon for 10-20 minutes at a plasma treatment power of 400-500W; they are then soaked in an ethanol solution containing 3-aminopropyltriethoxysilane, stirred at 80-90℃ for 1-2 hours, filtered, and dried.

6. The fluororubber material for desert armored photovoltaic cables according to claim 5, characterized in that, The volume ratio of oxygen to argon is 1:4-6.

7. The fluororubber material for desert armored photovoltaic cables according to claim 5, characterized in that, The mass ratio of carbon fiber to 3-aminopropyltriethoxysilane is 10-20:0.3-0.

8.

8. The method for preparing fluororubber material for desert armored photovoltaic cables according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Irradiate the fluororubber with ultraviolet light for 10-20 minutes, immerse it in sodium hydroxide solution, let it stand for 5-10 minutes, filter, wash, and vacuum dry. The product is mixed with activated carbon fiber, polyethylene wax and calcium stearate, and kneaded at 120-130℃ for 1-5 minutes to obtain compound a. S2. Mix methyl vinyl silicone rubber, fumed silica, nano silica, compatibilizer, and composite vulcanizing agent, and knead at 120-140℃ for 2-6 minutes. Then add compound a and continue kneading for 1-3 minutes to obtain compound b. Extrude and granulate.

9. The method for preparing fluororubber material for desert armored photovoltaic cables according to claim 8, characterized in that, In S1, the ultraviolet wavelength is 254nm, and the ultraviolet irradiation intensity is 80-120mW / cm². 2 .

10. The method for preparing fluororubber material for desert armored photovoltaic cables according to claim 8, characterized in that, In S2, an extruder is used for extrusion granulation. The temperatures of each zone of the extruder are as follows: Zone I 145-150℃, Zone II 170-175℃, Zone III 180-190℃, Zone IV 200-205℃, Zone V 210-220℃, and the die head 195-205℃.

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