Wear-resistant cable for rail transit as well as preparation method and application of wear-resistant cable

Abstract

The invention relates to the technical field of cables, and provides a wear-resistant cable for rail transit and a preparation method and application thereof, and the wear-resistant cable sequentially comprises a conductor, an insulating layer and a sheath layer from inside to outside; the conductor is an aluminum conductor or a copper conductor, and the insulating layer is a crosslinked polyethylene insulating layer; the sheath layer comprises the following raw material components in parts by weight: 100 parts of polyethylene, 30-40 parts of an acetic acid-vinyl acetate copolymer, 5-35 parts of epoxidized natural rubber, 8-20 parts of polyethylene glycol terephthalate and 30-40 parts of nano titanium silicide. According to the technical scheme, the problems of poor wear resistance and low tensile strength of a cable sheath layer in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a wear-resistant cable for rail transit and a preparation method and application thereof. Background Art

[0002] With the rapid development of the rail transit industry, the market has increasingly higher performance requirements for various supporting facilities. As a key part of the rail transit system for transmitting power and signals, the reliability of cables is directly related to the safe operation of the entire system. In the complex environment of rail transit, cables face a variety of challenges, among which wear resistance is a crucial performance indicator.

[0003] At present, the common cable sheath materials on the market have certain insulation properties, but their wear resistance and tensile strength are relatively poor. In the harsh environment of rail transit, after a period of use, the sheath of these cables is prone to wear and damage, thereby reducing the service life and safety of the cables. Therefore, for rail transit construction, it is of great significance to develop a cable with good wear resistance and high tensile strength. Summary of the invention

[0004] The present invention provides a wear-resistant cable for rail transit and a preparation method and application thereof, which solve the problems of poor wear resistance and low tensile strength of the cable sheath layer in the related art.

[0005] The technical solution of the present invention is as follows: The present invention provides a wear-resistant cable for rail transit, which comprises a conductor, an insulating layer and a sheath layer from the inside to the outside; The conductor is an aluminum conductor or a copper conductor, and the insulating layer is a cross-linked polyethylene insulating layer; The raw materials of the sheath layer include the following components in parts by weight: 100 parts of polyethylene, 30-40 parts of acetic acid-vinyl acetate copolymer, 5-35 parts of epoxidized natural rubber, 8-20 parts of polyethylene terephthalate, and 30-40 parts of nano titanium silicide.

[0006] As a further technical solution, the weight ratio of the epoxidized natural rubber to polyethylene terephthalate is 1-1.5:1.

[0007] In the present invention, when the weight ratio of epoxidized natural rubber to polyethylene terephthalate is 1-1.5:1, the effects of the two can be further enhanced, thereby further improving the tensile strength and wear resistance of the jacket layer.

[0008] As a further technical solution, the epoxidation degree of the epoxidized natural rubber is ≥25 mol%.

[0009] In the present invention, when the epoxidation degree of the epoxidized natural rubber is ≥25 mol %, the tensile strength and abrasion resistance of the sheath layer can be further improved.

[0010] As a further technical solution, the median particle size of the nano titanium silicide is 50-100 nm.

[0011] As a further technical solution, the nano titanium silicide is 5-amino-o-cresol-modified nano titanium silicide.

[0012] In the present invention, when the nano titanium silicide is 5-amino-o-cresol-modified nano titanium silicide, the tensile strength and wear resistance of the sheath layer can be further improved. It is speculated that 5-amino-o-cresol can not only improve the dispersion performance of the nano titanium silicide, but also cause the nano titanium silicide and polyethylene terephthalate to produce weak interaction between aromatic rings, thereby further improving the embedding effect of the nano titanium silicide inside the sheath layer, and further improving the tensile strength and wear resistance of the sheath layer.

[0013] As a further technical solution, in the 5-amino-o-cresol-modified nano-titanium silicide, the weight ratio of 5-amino-o-cresol to nano-titanium silicide is 3-7:100.

[0014] In the present invention, when the weight ratio of 5-amino-o-cresol to nano-titanium silicide is 3-7:100, it helps to further improve the tensile strength and wear resistance of the sheath layer.

[0015] As a further technical solution, the preparation method of 5-amino-o-cresol modified nano titanium silicide comprises the following steps: dissolving 5-amino-o-cresol in ethanol, adding nano titanium silicide, dispersing evenly, and drying to obtain the 5-amino-o-cresol modified nano titanium silicide.

[0016] As a further technical solution, the raw material of the sheath layer also includes 2 to 5 parts of an antioxidant.

[0017] In the present invention, the addition of an antioxidant can prevent the mechanical properties of the sheath layer from being degraded due to oxidation, thereby extending the service life of the cable.

[0018] As a further technical solution, the antioxidant includes one or more of antioxidant 1076, antioxidant 168, and antioxidant 1010, preferably antioxidant 1076.

[0019] As a further technical solution, the raw material of the sheath layer also includes 1 to 4 parts of a lubricant.

[0020] In the present invention, the addition of lubricant can reduce the surface defects of the sheath layer and improve the overall quality of the sheath layer.

[0021] As a further technical solution, the lubricant includes one or more of silicone masterbatch, calcium stearate, and solid paraffin, preferably calcium stearate.

[0022] The present invention also proposes a method for preparing a wear-resistant cable for rail transit, comprising the following steps: S1, blending and extruding the raw materials of the sheath layer to obtain a sheath layer material; S2. In order of the insulating layer and the sheath layer from the inside to the outside, the insulating layer material and the sheath layer material are extruded onto the surface of the conductor to obtain a wear-resistant cable.

[0023] As a further technical solution, in step S1, the temperature during extrusion is 120-150°C.

[0024] The present invention also proposes the use of the wear-resistant cable for rail transit or the wear-resistant cable prepared by the preparation method in rail transit.

[0025] The working principle and beneficial effects of the present invention are: In the present invention, the tensile strength and wear resistance of the cable sheath layer are improved by optimizing the component formula of the sheath layer. Among them, the epoxidized natural rubber and polyethylene terephthalate in the raw materials of the sheath layer can be cross-linked, thereby forming a mesh structure inside the sheath layer, thereby improving the tensile strength and wear resistance of the sheath layer. In addition, the addition of nano titanium silicide can form an inlay inside the sheath layer, improve the ability of the sheath layer to resist deformation due to external forces, thereby improving the tensile strength and wear resistance of the sheath layer. DETAILED DESCRIPTION

[0026] 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.

[0027] In the following embodiments and comparative examples, unless otherwise specified, the conductor is a pure aluminum conductor; the insulating layer material is cross-linked polyethylene, model LE0592; the model of polyethylene is DFDA-7042; the model of acetic acid-vinyl acetate copolymer is EVA-7A50H; the natural rubber is No. 10 standard rubber; the model of polyethylene terephthalate is GN119; and the median particle size of nano-titanium silicide is 75 nm.

[0028] Example 1 A method for preparing a wear-resistant cable for rail transit, comprising the following steps: S1. By weight, 100 parts of polyethylene, 30 parts of acetic acid-vinyl acetate copolymer, 5 parts of epoxidized natural rubber (model ENR-10, epoxidation degree of 10 mol%), 8 parts of polyethylene terephthalate, 10 parts of nano-titanium silicide, 2 parts of antioxidant 1076 and 1 part of calcium stearate are blended and extruded to obtain a sheath layer material; Among them, during extrusion, the temperature of zone 1 is 130°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 120°C; S2. In order of insulating layer and sheath layer from inside to outside, the insulating layer material and the sheath layer material are extruded onto the surface of the conductor to obtain a wear-resistant cable.

[0029] Example 2 A method for preparing a wear-resistant cable for rail transit, comprising the following steps: S1. By weight, 100 parts of polyethylene, 40 parts of acetic acid-vinyl acetate copolymer, 35 parts of epoxidized natural rubber (model ENR-10, epoxidation degree of 10 mol%), 20 parts of polyethylene terephthalate, 40 parts of nano-titanium silicide, 5 parts of antioxidant 1076 and 4 parts of calcium stearate are blended and extruded to obtain a sheath layer material; Among them, during extrusion, the temperature of zone 1 is 130°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 120°C; S2. In order of insulating layer and sheath layer from inside to outside, the insulating layer material and the sheath layer material are extruded onto the surface of the conductor to obtain a wear-resistant cable.

[0030] Example 3 A method for preparing a wear-resistant cable for rail transit, comprising the following steps: S1. By weight, 100 parts of polyethylene, 35 parts of acetic acid-vinyl acetate copolymer, 10 parts of epoxidized natural rubber (model ENR-10, epoxidation degree of 10 mol%), 15 parts of polyethylene terephthalate, 40 parts of nano-titanium silicide, 3 parts of antioxidant 1076 and 2 parts of calcium stearate are blended and extruded to obtain a sheath layer material; Among them, during extrusion, the temperature of zone 1 is 130°C, the temperature of zone 2 is 150°C, and the temperature of zone 3 is 120°C; S2. In order of insulating layer and sheath layer from inside to outside, the insulating layer material and the sheath layer material are extruded onto the surface of the conductor to obtain a wear-resistant cable.

[0031] Example 4 The only difference between this embodiment and embodiment 3 is that, in this embodiment, the weight parts of epoxidized natural rubber are 17 parts, and the weight parts of polyethylene terephthalate are 8 parts.

[0032] Example 5 The only difference between this embodiment and embodiment 3 is that in this embodiment, the weight parts of epoxidized natural rubber are 12.5 parts, and the weight parts of polyethylene terephthalate are 12.5 parts.

[0033] Example 6 The only difference between this embodiment and embodiment 3 is that, in this embodiment, the weight parts of epoxidized natural rubber are 15 parts, and the weight parts of polyethylene terephthalate are 10 parts.

[0034] Example 7 The only difference between this embodiment and embodiment 6 is that in this embodiment, the type of epoxidized natural rubber is ENR-25, and the epoxidation degree is 25 mol%.

[0035] Example 8 The only difference between this embodiment and embodiment 6 is that in this embodiment, the type of epoxidized natural rubber is ENR-50, and the epoxidation degree is 50 mol%.

[0036] Example 9 The only difference between this embodiment and embodiment 8 is that in this embodiment, the nano titanium silicide is 5-amino-o-cresol-modified nano titanium silicide, and the preparation method of 5-amino-o-cresol-modified nano titanium silicide comprises the following steps: dissolving 1 part of 5-amino-o-cresol in 150 parts of ethanol, adding 100 parts of nano titanium silicide, dispersing evenly, and drying to obtain 5-amino-o-cresol-modified nano titanium silicide.

[0037] Example 10 The difference between this embodiment and embodiment 9 is that, in this embodiment, the weight portion of 5-amino-o-cresol is 10 parts.

[0038] Embodiment 11 The difference between this embodiment and embodiment 9 is that, in this embodiment, the weight portion of 5-amino-o-cresol is 3 parts.

[0039] Example 12 The difference between this embodiment and embodiment 9 is that, in this embodiment, the weight portion of 5-amino-o-cresol is 7 parts.

[0040] Comparative Example 1 The difference between this comparative example and Example 1 is that in this comparative example, no epoxidized natural rubber is added, and 13 parts of polyethylene terephthalate are added.

[0041] Comparative Example 2 The difference between this comparative example and Example 1 is that in this comparative example, polyethylene terephthalate is not added, and 13 parts of epoxidized natural rubber are added.

[0042] Comparative Example 3 The only difference between this comparative example and Example 1 is that in this comparative example, polyethylene terephthalate and epoxidized natural rubber are not added.

[0043] Comparative Example 4 The only difference between this comparative example and Example 1 is that in this comparative example, the epoxidized natural rubber is replaced by an equal amount of natural rubber.

[0044] Comparative Example 5 The only difference between this comparative example and Example 1 is that in this comparative example, nano titanium silicide is not added.

[0045] The following performance tests were performed on the sheath layer materials in Examples 1 to 12 and Comparative Examples 1 to 5: ① Tensile strength: refer to GB / T 1040.1-2018 "Determination of tensile properties of plastics Part 1: General" to test the tensile strength, where the test speed is 20mm / min, and the average of the results of 3 specimens in each group is taken as the final result, and the result is retained to one decimal place; ② Volume wear: refer to GB / T 3960-2016 "Plastic Sliding Friction and Wear Test Method" to test volume wear, where the test ring rotates at 200r / min, the test time is 2h, the load is 196N, and the average value of the results of 3 specimens in each group is taken as the final result.

[0046] The test results are shown in Table 1 below.

[0047] Table 1 Sheath layer material performance test results

[0048] Comparison between Example 1 and Comparative Examples 1 to 4 shows that the addition of epoxidized natural rubber and polyethylene terephthalate can significantly improve the tensile strength and wear resistance of the sheath layer. Comparison between Example 1 and Comparative Example 5 shows that the addition of nano-titanium silicide can significantly improve the tensile strength and wear resistance of the sheath layer.

[0049] Comparison between Examples 3-4 and 5-6 shows that when the weight ratio of epoxidized natural rubber to polyethylene terephthalate is 1-1.5:1, the effect of the two can be further enhanced, thereby further improving the tensile strength and wear resistance of the sheath layer. Comparison between Examples 6 and 7-8 shows that when the epoxidation degree of the epoxidized natural rubber is ≥25 mol%, the tensile strength and wear resistance of the sheath layer can be further improved.

[0050] Comparison between Example 8 and Examples 9 to 12 shows that by modifying nano titanium silicide with 5-amino-o-cresol, the tensile strength and wear resistance of the sheath layer can be further improved. Comparison between Examples 9 to 10 and Examples 11 to 12 shows that when the weight ratio of 5-amino-o-cresol to nano titanium silicide is 3 to 7:100, it helps to further improve the tensile strength and wear resistance of the sheath layer.

[0051] 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 wear-resistant cable for rail transit, characterized in that: From inside to outside, it includes conductor, insulation layer and sheath layer; The conductor is an aluminum conductor or a copper conductor, and the insulating layer is a cross-linked polyethylene insulating layer; The raw materials of the sheath layer include the following components in parts by weight: 100 parts of polyethylene, 30-40 parts of acetic acid-vinyl acetate copolymer, 5-35 parts of epoxidized natural rubber, 8-20 parts of polyethylene terephthalate, and 30-40 parts of nano titanium silicide.

2. A wear-resistant cable for rail transit according to claim 1, characterized in that: The weight ratio of the epoxidized natural rubber to polyethylene terephthalate is 1-1.5:

1.

3. A wear-resistant cable for rail transit according to claim 1, characterized in that: The epoxidation degree of the epoxidized natural rubber is ≥25 mol %.

4. The wear-resistant cable for rail transit according to claim 1, characterized in that: The nano titanium silicide is 5-amino-o-cresol modified nano titanium silicide.

5. A wear-resistant cable for rail transit according to claim 4, characterized in that: In the 5-amino-o-cresol-modified nano-titanium silicide, the weight ratio of 5-amino-o-cresol to nano-titanium silicide is 3-7:

100.

6. A wear-resistant cable for rail transit according to claim 4, characterized in that: The preparation method of 5-amino-o-cresol modified nano titanium silicide comprises the following steps: dissolving 5-amino-o-cresol in ethanol, adding nano titanium silicide, dispersing evenly, and drying to obtain the 5-amino-o-cresol modified nano titanium silicide.

7. A wear-resistant cable for rail transit according to any one of claims 1 to 6, characterized in that: The raw materials of the sheath layer also include 2 to 5 parts of an antioxidant; The antioxidant includes one or more of antioxidant 1076 , antioxidant 168 , and antioxidant 1010 .

8. A wear-resistant cable for rail transit according to any one of claims 1 to 6, characterized in that: The raw materials of the sheath layer also include 1 to 4 parts of lubricant; The lubricant includes one or more of silicone masterbatch, calcium stearate, and solid paraffin.

9. The method for preparing a wear-resistant cable for rail transit according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, blending and extruding the raw materials of the sheath layer to obtain a sheath layer material; S2. In order of the insulating layer and the sheath layer from the inside to the outside, the insulating layer material and the sheath layer material are extruded onto the surface of the conductor to obtain a wear-resistant cable.

10. Use of the wear-resistant cable for rail transit according to any one of claims 1 to 8 or the wear-resistant cable prepared by the preparation method according to claim 9 in rail transit.

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