Fluoroplastic cable

Abstract

The invention relates to the technical field of cables, and provides a fluoroplastic cable which sequentially comprises a cable core, an insulating layer and a protective layer from inside to outside, and the protective layer comprises the following raw materials in parts by weight: 100 parts of polytetrafluoroethylene, 15-20 parts of an ethylene-tetrafluoroethylene copolymer, 8-12 parts of a compatilizer, 15-20 parts of a wear-resistant filler, 1-3 parts of a lubricant, 1-4 parts of a dispersant and 2-3 parts of an antioxidant; the compatilizer is prepared from a styrene-maleic anhydride copolymer and an epoxy group-containing compound. According to the technical scheme, the problems of poor mechanical strength and wear resistance of the fluoroplastic cable in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of cables, and in particular to a fluoroplastic cable. Background Art

[0002] Cables are the main carrier of power transmission, transmitting the electricity generated by power plants to various substations, factories, commercial buildings and homes. In some crowded places, such as high-rise buildings, hospitals, shopping malls, etc., and places with extremely high safety requirements, such as nuclear power plants and subways, higher requirements are placed on the flame retardant performance and low smoke of cables.

[0003] Fluoroplastic cables have good flame retardant properties and are not easy to burn, which can prevent the fire from spreading to other areas through the cable. Moreover, when burning, fluoroplastic cables produce very little smoke, which can give people more time to evacuate to a safe area when a fire occurs, effectively ensuring the safety of personnel. However, fluoroplastic cables have poor mechanical properties and low hardness. When subjected to external friction, they are more susceptible to wear, which affects the normal use of fluoroplastic cables. Summary of the invention

[0004] The invention provides a fluoroplastic cable, which solves the problem of poor mechanical strength and wear resistance of the fluoroplastic cable in the related art.

[0005] The technical solution of the present invention is as follows: The invention provides a fluoroplastic cable, which comprises a cable core, an insulating layer and a protective layer from the inside to the outside. The protective layer comprises the following raw materials in parts by weight: 100 parts of polytetrafluoroethylene, 15-20 parts of ethylene-tetrafluoroethylene copolymer, 8-12 parts of compatibilizer, 15-20 parts of wear-resistant filler, 1-3 parts of lubricant, 1-4 parts of dispersant and 2-3 parts of antioxidant; the compatibilizer consists of styrene-maleic anhydride copolymer and epoxy-containing compound.

[0006] As a further technical solution, the mass ratio of the styrene-maleic anhydride copolymer to the epoxy-containing compound is 5:1-2.

[0007] As a further technical solution, the epoxy-containing compound includes one or more of (7-octenyl)ethylene oxide, vinylcyclohexene dioxide, and 3-[(p-acetylamino)phenoxy]-1,2-propylene oxide.

[0008] As a further technical solution, the insulating layer is a polyvinyl chloride insulating layer.

[0009] As a further technical solution, the ethylene-tetrafluoroethylene copolymer consists of a first ethylene-tetrafluoroethylene copolymer and a second ethylene-tetrafluoroethylene copolymer, wherein the first ethylene-tetrafluoroethylene copolymer and the second ethylene-tetrafluoroethylene copolymer have the same density and different melt mass flow rates.

[0010] As a further technical solution, the melt mass flow rate of the first ethylene-tetrafluoroethylene copolymer is 10-20 g / 10 min, and the melt mass flow rate of the second ethylene-tetrafluoroethylene copolymer is 30-40 g / 10 min.

[0011] As a further technical solution, the mass ratio of the first ethylene-tetrafluoroethylene copolymer to the second ethylene-tetrafluoroethylene copolymer is 3:1-3.

[0012] As a further technical solution, the mass ratio of the first ethylene-tetrafluoroethylene copolymer to the second ethylene-tetrafluoroethylene copolymer is 3:2.

[0013] As a further technical solution, the density of the first ethylene-tetrafluoroethylene copolymer and the second ethylene-tetrafluoroethylene copolymer are both 1.78 g / cm 3 .

[0014] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 2246.

[0015] As a further technical solution, the wear-resistant filler includes one or both of barium sulfate and calcium sulfate.

[0016] As a further technical solution, the particle size of the wear-resistant filler is 1250 mesh.

[0017] As a further technical solution, the lubricant includes one or both of stearic acid and polyethylene wax.

[0018] As a further technical solution, the dispersant is one or both of fatty alcohol polyoxyethylene ether and triethylhexyl phosphoric acid.

[0019] The present invention also provides a method for preparing a fluoroplastic cable, comprising the following steps: S1. After extruding polyvinyl chloride outside the conductor, a conductor core is obtained; S2, twisting a plurality of conductor cores to obtain a cable core; S3, extruding the insulating layer raw material outside the cable core to obtain a semi-finished cable; S4. Extruding the raw material of the protective layer onto the semi-finished cable to obtain a fluoroplastic cable.

[0020] The working principle and beneficial effects of the present invention are: In the present invention, the tensile strength of polytetrafluoroethylene is relatively low, while the tensile strength of ethylene-tetrafluoroethylene copolymer is relatively high. The joint use of polytetrafluoroethylene and ethylene-tetrafluoroethylene copolymer can improve the overall tensile strength of the fluoroplastic cable protective layer. In addition, polytetrafluoroethylene is difficult to process, while ethylene-tetrafluoroethylene copolymer has relatively high processing performance. Adding ethylene-tetrafluoroethylene copolymer to polytetrafluoroethylene can also improve the processing performance of polytetrafluoroethylene, and improve the appearance, mechanical strength and wear resistance of the cable protective layer. The compatibilizer is composed of styrene-maleic anhydride copolymer and epoxy-containing compound. The addition of the compatibilizer can improve the mechanical strength and wear resistance of the fluoroplastic cable protective layer. DETAILED DESCRIPTION

[0021] 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.

[0022] In the following examples and comparative examples: Polytetrafluoroethylene: purity 100%; Styrene-maleic anhydride copolymer: model SMA-700; manufacturer: Jiaxing Huawen Chemical Co., Ltd.; 720AP ethylene-tetrafluoroethylene copolymer, melt mass flow rate is 10~20g / 10min, density is 1.78g / cm 3 ; 740AP ethylene-tetrafluoroethylene copolymer, melt mass flow rate is 30~40g / 10min, density is 1.78g / cm 3 ; All purchased from Dongguan Kadar Plastic Raw Materials Co., Ltd.; Barium sulfate: particle size 1250 mesh; Calcium sulfate: particle size 1250 mesh.

[0023] Example 1 A method for preparing a fluoroplastic cable comprises the following steps: S1. After extruding polyvinyl chloride outside the conductor, a conductor core is obtained; S2, twisting a plurality of conductor cores to obtain a cable core; S3, extruding the insulating layer material outside the cable core to form a polyvinyl chloride insulating layer to obtain a semi-finished cable; S4. Mix 100 parts of polytetrafluoroethylene, 15 parts of 720AP ethylene-tetrafluoroethylene copolymer, 8 parts of compatibilizer, 15 parts of barium sulfate, 1 part of stearic acid, 1 part of triethylhexyl phosphoric acid and 2 parts of antioxidant 2246, and extrude them on the outside of the cable semi-finished product to obtain a fluoroplastic cable; the compatibilizer is composed of styrene-maleic anhydride copolymer and (7-octenyl) ethylene oxide in a mass ratio of 5:1.

[0024] Example 2 A method for preparing a fluoroplastic cable comprises the following steps: S1. After extruding polyvinyl chloride outside the conductor, a conductor core is obtained; S2, twisting a plurality of conductor cores to obtain a cable core; S3, extruding the insulating layer material outside the cable core to form a polyvinyl chloride insulating layer to obtain a semi-finished cable; S4. Mix 100 parts of polytetrafluoroethylene, 18 parts of 720AP ethylene-tetrafluoroethylene copolymer, 10 parts of compatibilizer, 17 parts of calcium sulfate, 2 parts of stearic acid, 2 parts of triethylhexyl phosphoric acid and 2.5 parts of antioxidant 1010, and extrude them on the outside of the cable semi-finished product to obtain a fluoroplastic cable; the compatibilizer is composed of styrene-maleic anhydride copolymer and (7-octenyl) ethylene oxide in a mass ratio of 5:1.5.

[0025] Example 3 A method for preparing a fluoroplastic cable comprises the following steps: S1. After extruding polyvinyl chloride outside the conductor, a conductor core is obtained; S2, twisting a plurality of conductor cores to obtain a cable core; S3, extruding the insulating layer material outside the cable core to form a polyvinyl chloride insulating layer to obtain a semi-finished cable; S4. 100 parts of polytetrafluoroethylene, 20 parts of 720AP ethylene-tetrafluoroethylene copolymer, 12 parts of compatibilizer, 20 parts of calcium sulfate, 3 parts of stearic acid, 4 parts of triethylhexyl phosphoric acid and 3 parts of antioxidant 168 are mixed and extruded on the outside of the cable semi-finished product to obtain a fluoroplastic cable; the compatibilizer is composed of styrene-maleic anhydride copolymer and (7-octenyl) ethylene oxide in a mass ratio of 5:2.

[0026] Example 4 Compared with Example 1, Example 4 is different in that (7-octenyl)ethylene oxide is replaced by an equal amount of vinylcyclohexene dioxide.

[0027] Example 5 Compared with Example 1, Example 5 is different in that (7-octenyl)ethylene oxide is replaced with an equal amount of 3-[(p-acetylamino)phenoxy]-1,2-propylene oxide.

[0028] Example 6 Compared with Example 5, Example 6 is different in that all 3-[(p-acetylamino)phenoxy]-1,2-propylene oxide is replaced by 3-[(p-acetylamino)phenoxy]-1,2-propylene oxide and (7-octenyl)ethylene oxide in a mass ratio of 1:1.

[0029] Example 7 Compared with Example 5, Example 6 is different in that all 3-[(p-acetylamino)phenoxy]-1,2-propylene oxide is replaced by 3-[(p-acetylamino)phenoxy]-1,2-propylene oxide and vinylcyclohexene dioxide in a mass ratio of 1:1.

[0030] Example 8 Compared with Example 1, Example 8 is different in that 720AP ethylene-tetrafluoroethylene copolymer is replaced by an equal amount of 740AP ethylene-tetrafluoroethylene copolymer.

[0031] Example 9 Compared with Example 1, Example 9 is different in that the 720AP ethylene-tetrafluoroethylene copolymer is completely replaced by a 720AP ethylene-tetrafluoroethylene copolymer and a 740AP ethylene-tetrafluoroethylene copolymer in a mass ratio of 3:1.

[0032] Example 10 Compared with Example 1, Example 9 is different in that the 720AP ethylene-tetrafluoroethylene copolymer is completely replaced by a 720AP ethylene-tetrafluoroethylene copolymer and a 740AP ethylene-tetrafluoroethylene copolymer in a mass ratio of 3:2.

[0033] Embodiment 11 Compared with Example 1, Example 9 is different in that the 720AP ethylene-tetrafluoroethylene copolymer is completely replaced by a 720AP ethylene-tetrafluoroethylene copolymer and a 740AP ethylene-tetrafluoroethylene copolymer in a mass ratio of 1:1.

[0034] Comparative Example 1 Compared with Example 1, the compatibilizer of Comparative Example 1 is styrene-maleic anhydride copolymer.

[0035] Comparative Example 2 Compared with Example 1, the compatibilizer of Comparative Example 2 is (7-octenyl)ethylene oxide.

[0036] Comparative Example 3 Compared with Example 1, the compatibilizer in Comparative Example 3 is polypropylene glycol diglycidyl ether.

[0037] Comparative Example 4 Compared with Example 1, the polypropylene glycol diglycidyl ether of Comparative Example 4.

[0038] Test example The outer protective layer of the fluoroplastic cables prepared in Examples 1 to 11 and Comparative Examples 1 to 4 was cut open axially, and a narrow strip was taken to prepare a dumbbell-shaped test piece. The tensile strength of the protective layer of the test piece was measured according to the measurement method in GB / T 1040.3-2006 "Determination of tensile properties of plastics Part 3: Test conditions for films and sheets", and the wear amount of the protective layer was measured according to the measurement method in GB / T 3960-2016 "Plastic sliding friction and wear test method". The test conditions were 200 r / min, 2h, and the load was 196N. The measurement results are shown in Table 1.

[0039] Table 1 Performance measurement results of fluoroplastic cable protective layer in Examples and Comparative Examples

[0040] Compared with Example 1, the compatibilizer in Comparative Example 1 is styrene-maleic anhydride copolymer, the compatibilizer in Comparative Example 2 is (7-octenyl)ethylene oxide, Comparative Example 3 is other compatibilizers, and Comparative Example 4 does not add a compatibilizer. As a result, the tensile strength of the protective layer of the fluoroplastic cable in Comparative Examples 1 to 4 is lower than that in Example 1, and the wear amount is higher than that in Example 1, indicating that when the compatibilizer is composed of styrene-maleic anhydride copolymer and (7-octenyl)ethylene oxide, the mechanical strength and wear resistance of the fluoroplastic cable can be improved.

[0041] Compared with Example 1, Examples 4 and 5 respectively changed the composition of the compatibilizer. As a result, the tensile strength of Example 5 was higher than that of Example 1 and Example 4, and the wear amount was lower than that of Example 1 and Example 4, indicating that when the compatibilizer is composed of styrene-maleic anhydride copolymer and 3-[(p-acetylamino)phenoxy]-1,2-propylene oxide, the mechanical strength and wear resistance of the fluoroplastic cable protective layer can be further improved.

[0042] Compared with Example 5, Examples 6 and 7 change the composition of the compatibilizer. As a result, the tensile strength of Example 6 is higher than that of Example 5 and Example 7, and the wear amount is lower than that of Example 5 and Example 7, indicating that when the compatibilizer is composed of styrene-maleic anhydride copolymer, 3-[(p-acetylamino)phenoxy]-1,2-propylene oxide and (7-octenyl)ethylene oxide, the mechanical strength and wear resistance of the fluoroplastic cable protective layer can be further improved.

[0043] Compared with Example 1, Examples 8 to 11 change the composition of the ethylene-tetrafluoroethylene copolymer. As a result, the tensile strength of the fluoroplastic cable in Example 10 is higher than that in Examples 8 to 11, and the wear amount is lower than that in Examples 8 to 11, indicating that when the ethylene-tetrafluoroethylene copolymer is composed of 720AP ethylene-tetrafluoroethylene copolymer and 740AP ethylene-tetrafluoroethylene copolymer in a mass ratio of 3:2, the mechanical strength and wear resistance of the protective layer of the fluoroplastic cable can be further improved.

[0044] 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 fluoroplastic cable, characterized in that: From the inside to the outside, there are cable core, insulation layer and protective layer. The protective layer includes the following raw materials in parts by weight: 100 parts of polytetrafluoroethylene, 15-20 parts of ethylene-tetrafluoroethylene copolymer, 8-12 parts of compatibilizer, 15-20 parts of wear-resistant filler, 1-3 parts of lubricant, 1-4 parts of dispersant and 2-3 parts of antioxidant; the compatibilizer is composed of styrene-maleic anhydride copolymer and epoxy-containing compound.

2. A fluoroplastic cable according to claim 1, characterized in that: The mass ratio of the styrene-maleic anhydride copolymer to the epoxy-containing compound is 5:1-2.

3. A fluoroplastic cable according to claim 1, characterized in that: The epoxy group-containing compound includes one or more of (7-octenyl)ethylene oxide, vinylcyclohexene dioxide, and 3-[(p-acetylamino)phenoxy]-1,2-propylene oxide.

4. A fluoroplastic cable according to claim 1, characterized in that: The insulating layer is a polyvinyl chloride insulating layer.

5. A fluoroplastic cable according to claim 1, characterized in that: The ethylene-tetrafluoroethylene copolymer consists of a first ethylene-tetrafluoroethylene copolymer and a second ethylene-tetrafluoroethylene copolymer. The first ethylene-tetrafluoroethylene copolymer and the second ethylene-tetrafluoroethylene copolymer have the same density and different melt mass flow rates.

6. A fluoroplastic cable according to claim 5, characterized in that: The melt mass flow rate of the first ethylene-tetrafluoroethylene copolymer is 10-20 g / 10 min, and the melt mass flow rate of the second ethylene-tetrafluoroethylene copolymer is 30-40 g / 10 min.

7. A fluoroplastic cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1010 , antioxidant 168 , and antioxidant 2246 .

8. A fluoroplastic cable according to claim 1, characterized in that: The wear-resistant filler includes one or both of barium sulfate and calcium sulfate.

9. A fluoroplastic cable according to claim 1, characterized in that: The lubricant includes one or both of stearic acid and polyethylene wax.

10. A fluoroplastic cable according to claim 1, characterized in that: The dispersant is one or two of fatty alcohol polyoxyethylene ether and triethylhexyl phosphoric acid.

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