Ultraviolet-resistant photovoltaic cable

Abstract

The invention relates to the technical field of cables, and provides an ultraviolet-resistant photovoltaic cable which sequentially comprises a conductor, an insulating layer, a lining layer, a shielding layer and an outer sheath from inside to outside, and the outer sheath is prepared from the following raw materials in parts by weight: 35-45 parts of chloroprene rubber, 20-25 parts of ethylene propylene rubber, 25-35 parts of a flame retardant, 1-3 parts of a vulcanizing agent, 3-5 parts of an antioxidant, 0.8-1.2 parts of an ultraviolet absorbent, 3-5 parts of a lubricant and 15-25 parts of reinforcing filler; the reinforcing filler comprises lignin fibers and nano titanium dioxide, and the mass ratio of the lignin fibers to the nano titanium dioxide is (1: 5)-(5: 1). According to the technical scheme, the problems of poor mechanical property and ultraviolet resistance of the photovoltaic cable in the prior art are solved.

Description

Technical Field

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

[0002] With the continuous growth of global demand for energy and the increasing emphasis on clean energy, the development and utilization of solar energy as an inexhaustible clean energy has been rapidly developed. The photovoltaic industry has experienced rapid growth in the past few decades and has become an important part of the global energy field. In photovoltaic systems, photovoltaic cables play a vital role. It is responsible for transmitting the electricity generated by solar panels to inverters, distribution boxes and other equipment, and then integrating the electricity into the power grid or for users. The performance of photovoltaic cables directly affects the efficiency, stability and reliability of photovoltaic systems. Photovoltaic systems are usually installed outdoors and exposed to direct sunlight for a long time. Ultraviolet rays are one of the important factors that cause aging and degradation of photovoltaic cables. Ultraviolet rays can destroy the sheath material of the cable and change its molecular structure, thereby reducing the mechanical properties of the cable and causing faults such as leakage or short circuit in the cable. Therefore, the preparation of a UV-resistant photovoltaic cable is a problem that needs to be solved at present. Summary of the invention

[0003] The present invention provides a UV-resistant photovoltaic cable, which solves the problems of poor mechanical properties and UV resistance of photovoltaic cables in related technologies.

[0004] The technical solution of the present invention is as follows: The invention provides a UV-resistant photovoltaic cable, which comprises, from inside to outside, a conductor, an insulating layer, an inner lining layer, a shielding layer, and an outer sheath in sequence. The outer sheath comprises the following raw materials in parts by weight: 35-45 parts of chloroprene rubber, 20-25 parts of ethylene-propylene rubber, 25-35 parts of a flame retardant, 1-3 parts of a vulcanizer, 3-5 parts of an antioxidant, 0.8-1.2 parts of a UV absorber, 3-5 parts of a lubricant, and 15-25 parts of a reinforcing filler; the reinforcing filler comprises lignin fiber and nano-titanium dioxide, and the mass ratio of the lignin fiber to the nano-titanium dioxide is 1:5-5:1.

[0005] As a further technical solution, the conductor is copper wire; the insulating layer is polyethylene; the lining layer is mica tape; and the shielding layer is aluminum foil tape.

[0006] As a further technical solution, the mass ratio of the lignin fiber to the nano-titanium dioxide is 1:2-3.

[0007] As a further technical solution, the preparation method of the reinforcing filler comprises the following steps: adding lignin fiber and nano-titanium dioxide into deionized water for mixing, filtering and drying to obtain the reinforcing filler.

[0008] As a further technical solution, the mixing temperature is 50° C. and the mixing time is 2 hours.

[0009] As a further technical solution, the nano titanium dioxide is modified nano titanium dioxide, and the modified nano titanium dioxide is obtained by modifying nano titanium dioxide with an amino compound.

[0010] As a further technical solution, the added amount of the amino compound is 2% to 4% of the mass of the nano-titanium dioxide.

[0011] As a further technical solution, the amino-containing compound includes one or more of 3-phenyl-1-propylamine, 3,3-methylenedianiline, tris(4-aminophenyl)methane, 4-(1-aminobutyl)phenol, 3,4-diaminophenol, butyl carbamate, octylamine, and 1,2-bis(3-aminopropylamino)ethane.

[0012] In the present invention, by modifying nano titanium dioxide with amino compounds, the agglomeration of nano titanium dioxide can be inhibited and its dispersion performance in the rubber substrate can be improved, wherein the amino group in the amino compound can also form hydrogen bonds with the hydroxyl groups in the lignin fiber, thereby enhancing the binding property between the lignin fiber and the nano titanium dioxide, thereby improving the mechanical properties and UV resistance of the cable.

[0013] As a further technical solution, the number of amino groups in the amino-containing compound is 1-2, for example, one or more of 3-phenyl-1-propylamine, 3,3-methylenedianiline, and 1,10-diaminodecane.

[0014] In the present invention, by limiting the number of amino groups in the amino-containing compound to 1-2, the ultraviolet resistance and mechanical properties of the outer sheath are further improved.

[0015] As a further technical solution, the amino-containing compound also contains phenolic hydroxyl groups.

[0016] In the present invention, by limiting the amino-containing compound to also contain phenolic hydroxyl groups, the ultraviolet resistance of the outer sheath is further improved.

[0017] As a further technical solution, the preparation method of the modified nano titanium dioxide comprises the following steps: dissolving an amino compound in methanol, adding nano titanium dioxide for modification, and obtaining the modified nano titanium dioxide after drying.

[0018] As a further technical solution, the modification temperature is 40-50°C, and the modification time is 6-7h.

[0019] As a further technical solution, the amino compound includes one or two of 4-(1-aminobutyl)phenol and 3,4-diaminophenol.

[0020] As a further technical solution, the ultraviolet absorber includes one or more of ultraviolet absorber UV-120, ultraviolet absorber UV-1164, and ultraviolet absorber UV-531.

[0021] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 1135, and antioxidant 1076.

[0022] As a further technical solution, the vulcanizing agent includes one or more of diisopropylbenzene oxide, di-tert-butyl peroxyisopropylbenzene, and sulfur.

[0023] As a further technical solution, the lubricant includes one or more of stearic acid, calcium stearate, and polyethylene wax.

[0024] As a further technical solution, the flame retardant includes one or both of aluminum hydroxide and magnesium hydroxide.

[0025] The present invention also provides a method for preparing a UV-resistant photovoltaic cable, comprising the following steps: S1. Extruding polyethylene on the outside of the copper wire to obtain an insulating layer; S2, wrapping the mica tape around the outer side of the insulation layer to obtain an inner lining layer; S3, wrapping an aluminum foil tape around the outer side of the inner lining layer to obtain a shielding layer; S4. After mixing chloroprene rubber, ethylene propylene rubber, flame retardant, antioxidant, ultraviolet absorber, lubricant and reinforcing filler, add vulcanizing agent for vulcanization, and then extrude and wrap them on the outside of the shielding layer to obtain a UV-resistant photovoltaic cable.

[0026] The working principle and beneficial effects of the present invention are: In the present invention, chloroprene rubber and ethylene propylene rubber are used as base materials, so that the outer sheath of the cable has good flexibility and weather resistance, and the internal structure of the cable is effectively protected; the addition of flame retardant improves the flame retardant performance of the cable and reduces the risk of fire; reinforcing fillers composed of lignin fiber and nano titanium dioxide are also added, and the synergistic effect of lignin fiber and nano titanium dioxide further improves the ultraviolet resistance and mechanical properties of the outer sheath of the cable, thereby solving the problem of poor mechanical properties and ultraviolet resistance of the cable. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the following embodiments and comparative examples: Neoprene, model: CR244; EPDM, model: 4045M; lignin fiber, length: 1 mm, diameter: 100 μm; nano-titanium dioxide, particle size: 50 nm.

[0029] Example 1 A method for preparing a UV-resistant photovoltaic cable comprises the following steps: S1. Extruding polyethylene on the outside of the copper wire to obtain an insulating layer; S2, wrapping the mica tape around the outer side of the insulation layer to obtain an inner lining layer; S3, wrapping an aluminum foil tape around the outer side of the inner lining layer to obtain a shielding layer; S4. After mixing 35 parts of chloroprene rubber, 20 parts of ethylene propylene rubber, 25 parts of aluminum hydroxide, 3 parts of antioxidant 1010, 0.8 parts of UV absorber UV-120, 3 parts of stearic acid, and 15 parts of reinforcing fillers, 1 part of diisopropylbenzene oxide is added for vulcanization, and then extruded on the outside of the shielding layer to obtain a UV-resistant photovoltaic cable.

[0030] The reinforcing filler is composed of lignin fiber and nano-titanium dioxide in a mass ratio of 1:5; the preparation method of the reinforcing filler comprises the following steps: adding 8g of lignin fiber and 40g of modified nano-titanium dioxide into 300mL of deionized water, heating to 50°C and stirring for 2h, filtering and drying to obtain the reinforcing filler.

[0031] Example 2 A method for preparing a UV-resistant photovoltaic cable comprises the following steps: S1. Extruding polyethylene on the outside of the copper wire to obtain an insulating layer; S2, wrapping the mica tape around the outer side of the insulation layer to obtain an inner lining layer; S3, wrapping an aluminum foil tape around the outer side of the inner lining layer to obtain a shielding layer; S4. After mixing 45 parts of chloroprene rubber, 25 parts of ethylene-propylene rubber, 35 parts of magnesium hydroxide, 5 parts of antioxidant 1135, 1.2 parts of ultraviolet absorber UV-531, 5 parts of calcium stearate and 25 parts of reinforcing filler, 3 parts of di-tert-butyl peroxyisopropylbenzene are added for vulcanization, and then extruded on the outside of the shielding layer to obtain a UV-resistant photovoltaic cable.

[0032] The reinforcing filler is obtained by mixing lignin fiber and nano-titanium dioxide in a mass ratio of 5:1; the preparation method of the reinforcing filler comprises the following steps: adding 40g of lignin fiber and 8g of modified nano-titanium dioxide into 300mL of deionized water, heating to 50°C and stirring for 2h, filtering and drying to obtain the reinforcing filler.

[0033] Example 3 The only difference between this embodiment and embodiment 1 is that the reinforcing filler is composed of lignin fiber and nano-titanium dioxide in a mass ratio of 1:2.

[0034] Example 4 The only difference between this embodiment and embodiment 1 is that the reinforcing filler is composed of lignin fiber and nano-titanium dioxide in a mass ratio of 1:3.

[0035] Example 5 The only difference between this embodiment and embodiment 4 is that the nano titanium dioxide is replaced by an equal amount of modified nano titanium dioxide.

[0036] The preparation method of modified nano titanium dioxide comprises the following steps: dissolving 1g 3-phenyl-1-propylamine in 400mL methanol, adding 50g nano titanium dioxide and dispersing evenly, heating to 40°C, stirring at the temperature for 7h, and obtaining modified nano titanium dioxide after drying.

[0037] Example 6 The present embodiment is different from the embodiment 5 in that the preparation method of modified nano titanium dioxide comprises the following steps: dissolving 2 g of 3-phenyl-1-propylamine in 400 mL of methanol, adding 50 g of nano titanium dioxide and dispersing the mixture evenly, heating the mixture to 50° C., stirring the mixture for 6 h, and drying the mixture to obtain modified nano titanium dioxide.

[0038] Example 7 The only difference between this embodiment and embodiment 5 is that 3-phenyl-1-propylamine is replaced by an equal amount of 3,3-methylenedianiline.

[0039] Example 8 The only difference between this example and Example 6 is that 3-phenyl-1-propylamine is replaced by an equal amount of tris(4-aminophenyl)methane.

[0040] Example 9 The only difference between this embodiment and embodiment 5 is that 3-phenyl-1-propylamine is replaced by an equal amount of 4-(1-aminobutyl)phenol.

[0041] Example 10 The only difference between this embodiment and embodiment 5 is that 3-phenyl-1-propylamine is replaced by an equal amount of 3,4-diaminophenol.

[0042] Comparative Example 1 The only difference between this comparative example and Example 1 is that the wood cellulose is replaced by an equal amount of nano-titanium dioxide.

[0043] Comparative Example 2 The only difference between this comparative example and Example 1 is that the nano titanium dioxide is replaced by an equal amount of wood cellulose.

[0044] The photovoltaic cables prepared in Examples 1 to 10 and Comparative Examples 1 to 2 were tested for tensile strength of the outer sheath of the photovoltaic cables according to the test method in GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber"; the preparation method of the outer sheath was as follows: the sheath was cut along the cable axis, a narrow strip was cut, and a dumbbell specimen was prepared for testing; the change rate of tensile strength of the outer sheath after ultraviolet aging was determined according to the test method in GB / T16585-1996 "Artificial weathering aging (fluorescent ultraviolet lamp) test method for vulcanized rubber"; the ultraviolet aging condition was 0.89W / m 2 , temperature is 50℃, aging time is 480h, cycle time is 4h UV exposure and 4h condensation; the test results are shown in Table 1.

[0045] Table 1 Outer sheath performance test results

[0046] Compared with Example 1, the tensile strength of the outer sheath prepared in Comparative Examples 1-2 and the change rate of tensile strength after ultraviolet aging are lower than those in Example 1, indicating that the reinforcing filler composed of lignin fiber and nano-titanium dioxide can improve the mechanical properties and ultraviolet resistance of the outer sheath.

[0047] Compared with Example 4, Examples 5-6 use amino compounds to modify nano-titanium dioxide. As a result, the tensile strength of the outer sheath prepared in Examples 5-6 and the change rate of tensile strength after ultraviolet aging are higher than those in Example 4, indicating that the use of amino compounds to modify nano-titanium dioxide can further improve the mechanical properties and ultraviolet resistance of the outer sheath.

[0048] Compared with Example 4, Examples 7 to 8 change the number of amino groups in the amino-containing compound. As a result, the tensile strength of the outer sheath prepared in Example 8 and the change rate of tensile strength after ultraviolet aging are lower than those in Example 5 and Example 7, indicating that when the number of amino groups in the amino-containing compound is 1 to 2, the mechanical properties and UV resistance of the outer sheath can be further improved.

[0049] Compared with Example 5, the amino compounds in Examples 9 to 10 also contain phenolic hydroxyl groups. As a result, the change rate of tensile strength of the outer sheath prepared in Examples 9 to 10 after ultraviolet aging is higher than that in Example 5, indicating that when the number of amino groups in the amino compound is 1 to 2 and contains phenolic hydroxyl groups, the ultraviolet resistance of the outer sheath can be further improved.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A UV-resistant photovoltaic cable, characterized in that: The invention comprises, from inside to outside, a conductor, an insulating layer, an inner lining layer, a shielding layer and an outer sheath. The outer sheath comprises the following raw materials in parts by weight: 35-45 parts of chloroprene rubber, 20-25 parts of ethylene-propylene rubber, 25-35 parts of flame retardant, 1-3 parts of vulcanizer, 3-5 parts of antioxidant, 0.8-1.2 parts of ultraviolet absorber, 3-5 parts of lubricant and 15-25 parts of reinforcing filler. The reinforcing filler comprises lignin fiber and nano-titanium dioxide, and the mass ratio of the lignin fiber to the nano-titanium dioxide is 1:5-5:

1.

2. The UV-resistant photovoltaic cable according to claim 1, characterized in that: The mass ratio of the lignin fiber to the nano-titanium dioxide is 1:2-3.

3. The UV-resistant photovoltaic cable according to claim 1, characterized in that: The nano titanium dioxide is modified nano titanium dioxide, and the modified nano titanium dioxide is obtained by modifying nano titanium dioxide with an amino compound.

4. The UV-resistant photovoltaic cable according to claim 3, characterized in that: The added amount of the amino compound is 2% to 4% of the mass of the nano titanium dioxide.

5. The UV-resistant photovoltaic cable according to claim 3, characterized in that: The number of amino groups in the amino-containing compound is 1 to 2.

6. The UV-resistant photovoltaic cable according to claim 5, characterized in that: The amino-containing compound also contains phenolic hydroxyl groups.

7. The UV-resistant photovoltaic cable according to claim 6, characterized in that: The amino compound includes one or both of 4-(1-aminobutyl)phenol and 3,4-diaminophenol.

8. The UV-resistant photovoltaic cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1010 , antioxidant 1135 , and antioxidant 1076 .

9. The UV-resistant photovoltaic cable according to claim 1, characterized in that: The vulcanizing agent includes one or more of diisopropylbenzene oxide, di-tert-butyl peroxyisopropylbenzene, and sulfur.

10. The UV-resistant photovoltaic cable according to claim 1, characterized in that: The flame retardant includes one or both of aluminum hydroxide and magnesium hydroxide.

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