Fluoroplastic cable

Abstract

The application relates to the cable technical field and discloses a fluoroplastic cable which comprises, from inside to outside, a cable core, an insulation layer and a protective layer; the protective layer comprises the following components by weight: 100 parts of polytetrafluoroethylene, 15-20 parts of ethylene-tetrafluoroethylene copolymer, 8-12 parts of a compatilizer, 15-20 parts of wear-resistant filler, 1-3 parts of a lubricant, 1-4 parts of a dispersing agent and 2-3 parts of an antioxidant; the compatilizer is composed of styrene-maleic anhydride copolymer and an epoxy-containing compound. The technical scheme can solve the problem of poor mechanical strength and wear resistance of fluoroplastic cables in the related art.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more specifically, to a fluoroplastic cable. Background Technology

[0002] Cables are the primary carriers of electricity, delivering power generated by power plants to substations, factories, commercial buildings, and homes. In densely populated areas such as high-rise buildings, hospitals, and shopping malls, and in locations with extremely high safety requirements such as nuclear power plants and subways, higher demands are placed on the flame-retardant properties and low-smoke characteristics of cables.

[0003] Fluoroplastic cables have good flame-retardant properties, are not easily combustible, and can prevent fire from spreading to other areas through the cables. Furthermore, fluoroplastic cables produce very little smoke when burning, allowing more time for evacuation to safe areas during a fire, effectively protecting personnel safety. However, fluoroplastic cables have poor mechanical properties and low hardness, making them more prone to wear under external friction, thus affecting their normal use. Summary of the Invention

[0004] This invention proposes a fluoroplastic cable that solves the problem of poor mechanical strength and wear resistance of fluoroplastic cables in related technologies.

[0005] The technical solution of the present invention is as follows:

[0006] This invention proposes a fluoroplastic cable, comprising, from the inside out, a cable core, an insulation layer, and a protective layer. The protective layer comprises the following raw materials in parts by weight: 100 parts polytetrafluoroethylene, 15-20 parts ethylene-tetrafluoroethylene copolymer, 8-12 parts compatibilizer, 15-20 parts wear-resistant filler, 1-3 parts lubricant, 1-4 parts dispersant, and 2-3 parts antioxidant. The compatibilizer is composed of styrene-maleic anhydride copolymer and an epoxy-containing compound.

[0007] As a further technical solution, the mass ratio of the styrene-maleic anhydride copolymer to the epoxy-containing compound is 5:1~2.

[0008] As a further technical solution, the epoxy-containing compound includes one or more of (7-octenyl)ethylene oxide, vinylcyclohexene dioxide, and 3-[(p-acetamino)phenoxy]-1,2-epoxypropane.

[0009] As a further technical solution, the insulation layer is a polyvinyl chloride insulation layer.

[0010] As a further technical solution, the ethylene-tetrafluoroethylene copolymer is composed 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 but different melt flow rates.

[0011] As a further technical solution, the melt flow rate of the first ethylene-tetrafluoroethylene copolymer is 10~20 g / 10 min, and the melt flow rate of the second ethylene-tetrafluoroethylene copolymer is 30~40 g / 10 min.

[0012] As a further technical solution, the mass ratio of the first ethylene-tetrafluoroethylene copolymer to the second ethylene-tetrafluoroethylene copolymer is 3:1~3.

[0013] As a further technical solution, the mass ratio of the first ethylene-tetrafluoroethylene copolymer to the second ethylene-tetrafluoroethylene copolymer is 3:2.

[0014] As a further technical solution, the density of both the first ethylene-tetrafluoroethylene copolymer and the second ethylene-tetrafluoroethylene copolymer is 1.78 g / cm³. 3 .

[0015] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 2246.

[0016] As a further technical solution, the wear-resistant filler includes one or two of barium sulfate and calcium sulfate.

[0017] As a further technical solution, the particle size of the wear-resistant filler is 1250 mesh.

[0018] As a further technical solution, the lubricant includes one or both of stearic acid and polyethylene wax.

[0019] As a further technical solution, the dispersant is one or both of fatty alcohol polyoxyethylene ether and triethylhexyl phosphoric acid.

[0020] This invention also proposes a method for preparing fluoroplastic cables, comprising the following steps:

[0021] S1. After extruding polyvinyl chloride around the conductor, a conductor core is obtained;

[0022] S2. Twisting multiple conductor cores together to obtain a cable core;

[0023] S3. Extruding the insulation material onto the outside of the cable core to obtain a semi-finished cable;

[0024] S4. Extrude the protective layer material onto the outside of the cable semi-finished product to obtain a fluoroplastic cable.

[0025] The working principle and beneficial effects of this invention are as follows:

[0026] In this invention, polytetrafluoroethylene (PTFE) has low tensile strength, while ethylene-tetrafluoroethylene copolymer (ETC) has high tensile strength. The combined use of PTFE and ETC can improve the overall tensile strength of the fluoroplastic cable protective layer. Moreover, PTFE is difficult to process, while ETC has high processing performance. Adding ETC to PTFE can also improve the processing performance of PTFE, and improve the appearance, mechanical strength, and abrasion resistance of the cable protective layer. The compatibilizer is composed of styrene-maleic anhydride copolymer and epoxy-containing compounds. The addition of the compatibilizer can improve the mechanical strength and abrasion resistance of the fluoroplastic cable protective layer. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] In the following embodiments and comparative examples:

[0029] Polytetrafluoroethylene: 100% purity;

[0030] Styrene-maleic anhydride copolymer: Model SMA-700; Manufacturer: Jiaxing Huawen Chemical Co., Ltd.

[0031] 720AP ethylene-tetrafluoroethylene copolymer, with a melt flow rate of 10~20 g / 10 min and a density of 1.78 g / cm³. 3 740AP ethylene-tetrafluoroethylene copolymer, melt flow rate of 30~40 g / 10 min, density of 1.78 g / cm³ 3 All materials were purchased from Dongguan Kadar Plastic Raw Materials Co., Ltd.

[0032] Barium sulfate: particle size 1250 mesh;

[0033] Calcium sulfate: particle size 1250 mesh.

[0034] Example 1

[0035] A method for preparing a fluoroplastic cable includes the following steps:

[0036] S1. After extruding polyvinyl chloride around the conductor, a conductor core is obtained;

[0037] S2. Twisting multiple conductor cores together to obtain a cable core;

[0038] S3. Extruding the insulation material around the cable core to form a polyvinyl chloride insulation layer, thus obtaining a semi-finished cable;

[0039] 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 triethylhexylphosphonic acid, and 2 parts of antioxidant 2246 and extrude the mixture onto 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.

[0040] Example 2

[0041] A method for preparing a fluoroplastic cable includes the following steps:

[0042] S1. After extruding polyvinyl chloride around the conductor, a conductor core is obtained;

[0043] S2. Twisting multiple conductor cores together to obtain a cable core;

[0044] S3. Extruding the insulation material around the cable core to form a polyvinyl chloride insulation layer, thus obtaining a semi-finished cable;

[0045] 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 triethylhexylphosphonic acid, and 2.5 parts of antioxidant 1010 and extrude the mixture onto 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.

[0046] Example 3

[0047] A method for preparing a fluoroplastic cable includes the following steps:

[0048] S1. After extruding polyvinyl chloride around the conductor, a conductor core is obtained;

[0049] S2. Twisting multiple conductor cores together to obtain a cable core;

[0050] S3. Extruding the insulation material around the cable core to form a polyvinyl chloride insulation layer, thus obtaining a semi-finished cable;

[0051] S4. Mix 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 triethylhexylphosphonic acid, and 3 parts of antioxidant 168 and extrude the mixture onto 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.

[0052] Example 4

[0053] The difference between Example 4 and Example 1 is that (7-octenyl) ethylene oxide is replaced with an equal amount of vinylcyclohexene dioxide.

[0054] Example 5

[0055] The difference between Example 5 and Example 1 is that (7-octenyl)ethylene oxide is replaced with an equal amount of 3-[(p-acetamino)phenoxy]-1,2-epoxypropane.

[0056] Example 6

[0057] Compared with Example 5, Example 6 differs in that 3-[(p-acetamino)phenoxy]-1,2-epoxypropane is completely replaced with 3-[(p-acetamino)phenoxy]-1,2-epoxypropane and (7-octenyl)epoxyethylene in a mass ratio of 1:1.

[0058] Example 7

[0059] The difference between Example 6 and Example 5 is that 3-[(p-acetamino)phenoxy]-1,2-epoxypropane is completely replaced with 3-[(p-acetamino)phenoxy]-1,2-epoxypropane and vinylcyclohexene dioxide in a mass ratio of 1:1.

[0060] Example 8

[0061] The difference between Example 1 and Example 8 is that the 720AP ethylene-tetrafluoroethylene copolymer is replaced with an equal amount of 740AP ethylene-tetrafluoroethylene copolymer.

[0062] Example 9

[0063] Compared with Example 1, Example 9 differs in that all 720AP ethylene-tetrafluoroethylene copolymers are replaced with 720AP ethylene-tetrafluoroethylene copolymers and 740AP ethylene-tetrafluoroethylene copolymers in a mass ratio of 3:1.

[0064] Example 10

[0065] Compared with Example 1, Example 9 differs in that all 720AP ethylene-tetrafluoroethylene copolymers are replaced with 720AP ethylene-tetrafluoroethylene copolymers and 740AP ethylene-tetrafluoroethylene copolymers in a mass ratio of 3:2.

[0066] Example 11

[0067] Compared with Example 1, Example 9 differs in that all 720AP ethylene-tetrafluoroethylene copolymers are replaced with 720AP ethylene-tetrafluoroethylene copolymers and 740AP ethylene-tetrafluoroethylene copolymers in a mass ratio of 1:1.

[0068] Comparative Example 1

[0069] Compared with Example 1, the compatibilizer in Comparative Example 1 was a styrene-maleic anhydride copolymer.

[0070] Comparative Example 2

[0071] Compared with Example 1, the compatibilizer in Comparative Example 2 was (7-octenyl)ethylene oxide.

[0072] Comparative Example 3

[0073] Compared with Example 1, the compatibilizer in Comparative Example 3 was polypropylene glycol diglycidyl ether.

[0074] Comparative Example 4

[0075] Compared to Example 1, the polypropylene glycol diglycidyl ether of Comparative Example 4...

[0076] Test case

[0077] The outer protective layer of the fluoroplastic cables prepared in Examples 1-11 and Comparative Examples 1-4 was cut axially, and a narrow strip was taken to prepare a dumbbell-shaped specimen. The tensile strength of the protective layer was measured according to the test 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 test method in GB / T 3960-2016 "Plastics - Test method for sliding friction and wear". The test conditions were 200 r / min, 2 h, and 196 N load. The test results are shown in Table 1.

[0078] Table 1. Performance test results of fluoroplastic cable protective layers in the examples and comparative examples.

[0079]

[0080] Compared with Example 1, the compatibilizer in Comparative Example 1 was styrene-maleic anhydride copolymer, the compatibilizer in Comparative Example 2 was (7-octenyl) ethylene oxide, the compatibilizer in Comparative Example 3 was other compatibilizers, and no compatibilizer was added in Comparative Example 4. The results showed that the tensile strength of the protective layer of the fluoroplastic cables in Comparative Examples 1 to 4 was lower than that in Example 1, and the wear was higher than that in Example 1. This indicates 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 cables can be improved.

[0081] Compared with Example 1, Examples 4 and 5 changed the composition of the compatibilizer respectively. As a result, the tensile strength of Example 5 was higher than that of Examples 1 and 4, and the wear amount was lower than that of Examples 1 and 4. This shows that when the compatibilizer is composed of styrene-maleic anhydride copolymer and 3-[(p-acetamino)phenoxy]-1,2-epoxypropane, it can further improve the mechanical strength and wear resistance of the fluoroplastic cable protective layer.

[0082] Compared with Example 5, Examples 6 and 7 changed the composition of the compatibilizer. As a result, the tensile strength of Example 6 was higher than that of Examples 5 and 7, and the wear was lower than that of Examples 5 and 7. This shows that when the compatibilizer is composed of styrene-maleic anhydride copolymer, 3-[(p-acetamino)phenoxy]-1,2-epoxypropane and (7-octenyl)epoxyethylene, it can further improve the mechanical strength and wear resistance of the fluoroplastic cable protective layer.

[0083] Compared with Example 1, Examples 8-11 changed the composition of the ethylene-tetrafluoroethylene copolymer. As a result, the tensile strength of the fluoroplastic cable in Example 10 was higher than that in Examples 8-11, and the wear was lower than that in Examples 8-11. This shows 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 fluoroplastic cable protective layer can be further improved.

[0084] The above are merely 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 within the protection scope of the present invention.

Claims

1. A fluoroplastic cable, characterized in that, From inside to outside, the cable core, the insulation layer, the protective layer, the protective layer includes the following weight parts components: 100 parts of polytetrafluoroethylene, 15~20 parts of ethylene-tetrafluoroethylene copolymer, 8~12 parts of a compatibilizer, 15~20 parts of wear-resistant filler, 1~3 parts of a lubricant, 1~4 parts of a dispersing agent, 2~3 parts of an antioxidant; The compatibilizer is composed of styrene-maleic anhydride copolymer and epoxy-containing compound; The mass ratio of the styrene-maleic anhydride copolymer and the epoxy-containing compound is 5:1~2; The epoxy-containing compound includes one or more of (7-octenyl) oxirane, ethylene dioxy cyclohexene, 3-[(p-acetylamino) phenoxy]-1,2-epoxy propane.

2. A fluoroplastic cable according to claim 1, wherein The insulation layer is a polyvinyl chloride insulation layer.

3. A fluoroplastic cable according to claim 1, wherein The ethylene-tetrafluoroethylene copolymer is composed 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.

4. A fluoroplastic cable according to claim 3, wherein 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.

5. A fluoroplastic cable according to claim 1, wherein The antioxidant includes one or more of antioxidant 1010, antioxidant 168, antioxidant 2246.

6. A fluoroplastic cable according to claim 1, wherein The wear-resistant filler includes one or both of barium sulfate and calcium sulfate.

7. A fluoroplastic cable according to claim 1, wherein The lubricant includes one or both of stearic acid and polyethylene wax.

8. A fluoroplastic cable according to claim 1, wherein The dispersing agent is one or both of fatty alcohol polyoxyethylene ether and triethylhexyl phosphate. The dispersing agent is one or both of fatty alcohol polyoxyethylene ether and triethylhexyl phosphate.

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