Wear-resistant cable and preparation method thereof

Abstract

The present invention relates to the field of cable technology, and proposes a wear-resistant cable and a preparation method thereof. A wear-resistant cable comprises, from the outside to the inside, an outer sheath, an insulating layer, and a conductor. The outer sheath comprises the following components in parts by weight: 80 parts of polyurethane, 18 to 24 parts of high-density polyethylene, 4 to 6 parts of ethylene-butyl acrylate copolymer, 5 to 8 parts of ethylene-vinyl acetate copolymer, 10 to 20 parts of sillimanite, 4 to 8 parts of a lubricating component, 20 to 30 parts of a flame retardant, 1 to 3 parts of an antioxidant, and 2 to 4 parts of a plasticizer; the lubricating component comprises N,N-bis(hydroxyethyl)cocamide and aluminum dihydroxystearate in a weight ratio of 1:9 to 9:1. Through the above technical solution, the problem of poor wear resistance of the cable outer sheath in the related art is solved.

Description

Technical Field

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

[0002] A cable is a device for transmitting electrical energy or signals, typically consisting of a conductor, an insulation layer, and an outer sheath. Depending on the application scenario or different performance requirements, it may also have a shielding layer, armor layer, or other additional layers. The conductor is the part of the cable that transmits current or signals, and is typically made of metal materials such as copper and aluminum. The insulation layer is typically wrapped around the outside of the conductor. Its main function is to isolate the conductor from other parts to prevent current leakage and short circuits. Commonly used materials include polyvinyl chloride and ethylene propylene rubber. The outer sheath is the outermost layer of the cable, in direct contact with the external environment. It is typically made of materials such as cross-linked polyethylene and polyurethane to provide protection.

[0003] Usually, the outer sheath and some additional wear-resistant structures play the main wear-resistant role in wear-resistant cables. In order to make the cable outer sheath play a better protective role, some wear-resistant materials are usually introduced into the cable outer sheath. Fiber materials are often used to improve the wear resistance and other mechanical properties of the cable outer sheath. However, the compatibility with the base material is poor, which limits the improvement of the wear resistance of the outer sheath.

[0004] Therefore, in order to enable the cable to be used for a long time in a high-wear environment, it is necessary to develop a cable with better wear resistance, which is of great significance for extending the service life of the cable. Summary of the Invention

[0005] The present invention provides a wear-resistant cable and a preparation method thereof, which solves the problem of poor wear resistance of the outer sheath of the cable in the related art.

[0006] The technical solutions of the present invention are as follows:

[0007] The present invention provides a wear-resistant cable, which comprises an outer sheath, an insulating layer and a conductor from the outside to the inside, wherein the outer sheath comprises the following components in parts by weight:

[0008] 80 parts of polyurethane, 18-24 parts of high-density polyethylene, 4-6 parts of ethylene-butyl acrylate copolymer, 5-8 parts of ethylene-vinyl acetate copolymer, 10-20 parts of sillimanite, 4-8 parts of lubricating component, 20-30 parts of flame retardant, 1-3 parts of antioxidant, and 2-4 parts of plasticizer;

[0009] The lubricating component comprises N,N-bis(hydroxyethyl)cocamide and dihydroxy aluminum stearate in a weight ratio of 1:9 to 9:1.

[0010] As a further technical solution, the weight of the N,N-bis(hydroxyethyl)cocamide is greater than or equal to the weight of the dihydroxy aluminum stearate.

[0011] In the present invention, when the weight of N, N-bis (hydroxyethyl) cocamide is greater than or equal to the weight of aluminum dihydroxystearate, the wear resistance of the cable outer sheath can be further improved, so that the wear amount of the cable outer sheath is 2.32-2.58 mg. However, when the weight of N, N-bis (hydroxyethyl) cocamide is less than the weight of aluminum dihydroxystearate, the improvement of the wear resistance is relatively poor.

[0012] As a further technical solution, the weight ratio of the N,N-di(hydroxyethyl)cocamide to dihydroxy aluminum stearate is 2 to 5:1.

[0013] As a further technical solution, the sillimanite is polybutylene succinate-coated sillimanite.

[0014] As a further technical solution, the raw materials for the polybutylene succinate-coated sillimanite include sillimanite and polybutylene succinate.

[0015] In the present invention, polybutylene succinate is used to coat sillimanite, which can improve the deformation resistance of the cable outer sheath. The reason is presumably that the surface treatment of sillimanite with polybutylene succinate can improve the bonding force between the sillimanite and the base material of the outer sheath, thereby making the sillimanite evenly dispersed in the outer sheath and reducing the pullout of the sillimanite. As a result, when the outer sheath is subjected to external force, the sillimanite in the outer sheath can better disperse the stress, thereby improving the deformation resistance of the cable outer sheath.

[0016] As a further technical solution, the weight ratio of sillimanite to polybutylene succinate is 10:1-2.

[0017] In the present invention, by regulating the weight ratio of sillimanite to polybutylene succinate, it is found that when the weight ratio of sillimanite to polybutylene succinate is 10:1-2, the deformation resistance of the cable outer sheath can be further improved.

[0018] As a further technical solution, the plasticizer is one or more of dioctyl phthalate, dibutyl phthalate, and diisononyl phthalate; and / or

[0019] The flame retardant is one or more of magnesium hydroxide, aluminum hydroxide, tetrabromobisphenol A, and triphenyl phosphate; and / or

[0020] The antioxidant is one or more of antioxidant 1098, antioxidant 264, and antioxidant 3114.

[0021] In the present invention, the addition of plasticizer to the cable outer sheath can reduce the interaction force between polymer molecules, making it easier for the molecular chains to slide relative to each other. During the processing of the cable outer sheath material, the material can have better fluidity during the molding process and the plasticity of the outer sheath material can be improved.

[0022] The addition of flame retardant to the cable outer sheath makes the cable outer sheath have certain flame retardant properties. It can form a heat-insulating and oxygen-isolating protective layer on the surface of the cable outer sheath, which can prevent heat from being transferred to the inside of the cable and protect the internal insulation layer and conductor from being damaged by high temperature.

[0023] The antioxidant in the cable outer sheath can capture the free radicals produced during the oxidation process, interrupt the chain reaction of the oxidation reaction, thereby slowing down the oxidation rate of the cable outer sheath and extending the service life of the cable.

[0024] As a further technical solution, the insulating layer is a polyvinyl chloride insulating layer;

[0025] The conductor is made of pure copper, copper alloy, or aluminum alloy.

[0026] As a further technical solution, when the flame retardant is magnesium hydroxide and triphenyl phosphate, the weight ratio of the magnesium hydroxide to triphenyl phosphate is 4-9:1.

[0027] The present invention also provides a method for preparing the wear-resistant cable, comprising the following steps:

[0028] S1, extruding the insulating layer and coating it on the surface of the conductor to form a conductor with the insulating layer coated on the surface;

[0029] S2. Mixing the components of the outer sheath and extruding the mixture onto the surface of the conductor covered with the insulation layer to obtain the wear-resistant cable.

[0030] The present invention also provides a method for preparing the wear-resistant cable, comprising the following steps:

[0031] S0, dissolving polybutylene succinate in chloroform, adding sillimanite, mixing, and drying to obtain polybutylene succinate-coated sillimanite;

[0032] S1, extruding the insulating layer and coating it on the surface of the conductor to form a conductor with the insulating layer coated on the surface;

[0033] S2. Mix the components of the outer sheath and extrude the mixture onto the surface of the conductor wrapped with the insulation layer to obtain the wear-resistant cable.

[0034] As a further technical solution, in step S0, the adding of sillimanite is divided into a first addition and a second addition. In the first addition, 55% to 65% of the weight of the sillimanite is added, and then stirred at 350 to 400 r / min for 1 to 2 hours; in the second addition, the remaining weight of the sillimanite is added, and stirred at 550 to 650 r / min for 1 to 2 hours.

[0035] The working principle and beneficial effects of the present invention are:

[0036] 1. In the present invention, the outer sheath of the wear-resistant cable is based on polyurethane, combined with high-density polyethylene, ethylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, sillimanite, a lubricating component, a flame retardant, an antioxidant and a plasticizer. The components cooperate with each other and play a synergistic role, so that the prepared outer sheath of the cable has good wear resistance.

[0037] 2. Polyurethane is the basic component, and its molecular structure contains urethane groups. The interaction between these groups gives the outer sheath basic mechanical properties and wear resistance. Ethylene-butyl acrylate copolymer and ethylene-vinyl acetate copolymer have good flexibility and impact resistance. The two can improve the processing performance of the outer sheath, making the outer sheath easier to form during the molding process, and can improve the outer sheath's ability to resist damage when impacted.

[0038] 3. The lubricating components include N,N-bis(hydroxyethyl)cocamide and dihydroxy aluminum stearate. The combined use of N,N-bis(hydroxyethyl)cocamide and dihydroxy aluminum stearate can reduce the friction between the components of the outer sheath, especially the friction between sillimanite and various polymers, so that the prepared outer sheath is uniform and dense, thereby greatly improving the wear resistance of the cable outer sheath. DETAILED DESCRIPTION

[0039] 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 embodiments described 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 making any creative efforts are within the scope of protection of the present invention.

[0040] In the following examples and comparative examples, the model of polyurethane is TPU 3491A; the model of high-density polyethylene is DMDA-8920; the model of ethylene-butyl acrylate copolymer is 3717AC; the model of ethylene-vinyl acetate copolymer is EVA V5110J; the average particle size of sillimanite is 325 μm; the CAS number of aluminum dihydroxystearate is 7047-84-9, and the content is 99%; and the model of polybutylene succinate is 3001MD.

[0041] Example 1

[0042] A method for preparing a wear-resistant cable comprises the following steps:

[0043] S1. Extruding and coating a polyvinyl chloride insulation layer on the surface of an aluminum alloy conductor to form a conductor having an insulation layer coated on the surface;

[0044] S2. 80 parts of polyurethane, 18 parts of high-density polyethylene, 4 parts of ethylene-butyl acrylate copolymer, 5 parts of ethylene-vinyl acetate copolymer, 10 parts of sillimanite, 0.4 parts of N,N-bis(hydroxyethyl)cocamide, 3.6 parts of dihydroxystearate aluminum, 16 parts of magnesium hydroxide, 4 parts of triphenyl phosphate, 1 part of antioxidant 1098, and 2 parts of dibutyl phthalate are mixed and extruded onto the surface of a conductor coated with an insulating layer to obtain a wear-resistant cable.

[0045] Example 2

[0046] A method for preparing a wear-resistant cable comprises the following steps:

[0047] S1. Extruding and coating a polyvinyl chloride insulation layer on the surface of an aluminum alloy conductor to form a conductor having an insulation layer coated on the surface;

[0048] S2. 80 parts of polyurethane, 21 parts of high-density polyethylene, 5 parts of ethylene-butyl acrylate copolymer, 6 parts of ethylene-vinyl acetate copolymer, 16 parts of sillimanite, 2 parts of N,N-bis(hydroxyethyl)cocamide, 4 parts of dihydroxystearate aluminum, 21 parts of magnesium hydroxide, 4 parts of triphenyl phosphate, 2 parts of antioxidant 264, and 3 parts of dioctyl phthalate are mixed and extruded onto the surface of a conductor coated with an insulating layer to obtain a wear-resistant cable.

[0049] Example 3

[0050] A method for preparing a wear-resistant cable comprises the following steps:

[0051] S1. Extruding and coating a polyvinyl chloride insulation layer on the surface of an aluminum alloy conductor to form a conductor having an insulation layer coated on the surface;

[0052] S2. 80 parts of polyurethane, 24 parts of high-density polyethylene, 6 parts of ethylene-butyl acrylate copolymer, 8 parts of ethylene-vinyl acetate copolymer, 20 parts of sillimanite, 7.2 parts of N,N-bis(hydroxyethyl)cocamide, 0.8 parts of dihydroxystearate aluminum, 27 parts of magnesium hydroxide, 3 parts of triphenyl phosphate, 3 parts of antioxidant 3114, and 4 parts of diisononyl phthalate are mixed and extruded onto the surface of a conductor coated with an insulating layer to obtain a wear-resistant cable.

[0053] Example 4

[0054] The only difference between this embodiment and embodiment 2 is that 2 parts of N, N-bis (hydroxyethyl) cocamide and 4 parts of dihydroxy aluminum stearate in embodiment 2 are replaced by 3 parts of N, N-bis (hydroxyethyl) cocamide and 3 parts of dihydroxy aluminum stearate.

[0055] Example 5

[0056] The only difference between this embodiment and embodiment 2 is that 2 parts of N, N-bis (hydroxyethyl) cocamide and 4 parts of dihydroxy aluminum stearate in embodiment 2 are replaced by 4 parts of N, N-bis (hydroxyethyl) cocamide and 2 parts of dihydroxy aluminum stearate.

[0057] Example 6

[0058] The only difference between this embodiment and embodiment 2 is that 2 parts of N, N-bis (hydroxyethyl) cocamide and 4 parts of dihydroxy aluminum stearate in embodiment 2 are replaced by 5 parts of N, N-bis (hydroxyethyl) cocamide and 1 part of dihydroxy aluminum stearate.

[0059] Example 7

[0060] A method for preparing a wear-resistant cable comprises the following steps:

[0061] S0, dissolving 1 part of polybutylene succinate in 40 parts of chloroform, adding 11 parts of sillimanite, stirring at 350r / min for 2h, adding 9 parts of sillimanite, stirring at 550r / min for 2h, and drying to obtain polybutylene succinate-coated sillimanite;

[0062] S1. Extruding and coating a polyvinyl chloride insulation layer on the surface of an aluminum alloy conductor to form a conductor having an insulation layer coated on the surface;

[0063] S2. 80 parts of polyurethane, 21 parts of high-density polyethylene, 5 parts of ethylene-butyl acrylate copolymer, 6 parts of ethylene-vinyl acetate copolymer, 16 parts of polybutylene succinate-coated sillimanite, 5 parts of N,N-bis(hydroxyethyl)cocamide, 1 part of dihydroxystearate aluminum, 21 parts of magnesium hydroxide, 4 parts of triphenyl phosphate, 2 parts of antioxidant 264, and 3 parts of dioctyl phthalate are mixed and extruded onto the surface of a conductor coated with an insulating layer to obtain a wear-resistant cable.

[0064] Example 8

[0065] A method for preparing a wear-resistant cable comprises the following steps:

[0066] S0, dissolving 1 part of polybutylene succinate in 40 parts of chloroform, adding 13 parts of sillimanite, stirring at 400 r / min for 1 hour, adding 7 parts of sillimanite, stirring at 650 r / min for 1 hour, and drying to obtain polybutylene succinate-coated sillimanite;

[0067] S1. Extruding and coating a polyvinyl chloride insulation layer on the surface of an aluminum alloy conductor to form a conductor having an insulation layer coated on the surface;

[0068] S2. 80 parts of polyurethane, 21 parts of high-density polyethylene, 5 parts of ethylene-butyl acrylate copolymer, 6 parts of ethylene-vinyl acetate copolymer, 16 parts of polybutylene succinate-coated sillimanite, 5 parts of N,N-bis(hydroxyethyl)cocamide, 1 part of dihydroxystearate aluminum, 21 parts of magnesium hydroxide, 4 parts of triphenyl phosphate, 2 parts of antioxidant 264, and 3 parts of dioctyl phthalate are mixed and extruded onto the surface of a conductor coated with an insulating layer to obtain a wear-resistant cable.

[0069] Example 9

[0070] The only difference between this embodiment and embodiment 8 is that in the preparation process of polybutylene succinate-coated sillimanite in this embodiment, 5 parts of polybutylene succinate are added.

[0071] Example 10

[0072] The only difference between this embodiment and embodiment 8 is that in the preparation process of polybutylene succinate-coated sillimanite in this embodiment, 2 parts of polybutylene succinate are added.

[0073] Example 11

[0074] The only difference between this embodiment and embodiment 8 is that in the preparation process of polybutylene succinate-coated sillimanite in this embodiment, 4 parts of polybutylene succinate are added.

[0075] Comparative Example 1

[0076] The only difference between this comparative example and Example 1 is that in this comparative example, no N,N-bis(hydroxyethyl)cocamide is added, and 4 parts of aluminum dihydroxystearate are added.

[0077] Comparative Example 2

[0078] The only difference between this comparative example and Example 1 is that in this comparative example, no aluminum dihydroxystearate is added, and 4 parts of N,N-bis(hydroxyethyl)cocamide are added.

[0079] Comparative Example 3

[0080] The only difference between this comparative example and Example 1 is that in this comparative example, dihydroxy aluminum stearate is replaced by an equal amount of dibasic lead stearate.

[0081] Comparative Example 4

[0082] The only difference between this comparative example and Example 1 is that in this comparative example, N,N-di(hydroxyethyl)cocamide is replaced by an equal amount of ethylene bisstearamide.

[0083] Comparative Example 5

[0084] The only difference between this comparative example and Example 1 is that in this comparative example, neither N,N-di(hydroxyethyl)cocamide nor dihydroxystearate aluminum was added.

[0085] Experimental Example 1 Wear resistance test

[0086] After mixing and cooling the components of the outer sheaths of Examples 1 to 6 and Comparative Examples 1 to 5, cable outer sheath samples with a size of 30 mm × 7 mm × 6 mm were obtained. Mass wear tests were performed according to the method in GB / T 3960-2016 "Plastics Sliding Friction Wear Test Method". The test results are the average values ​​of the three samples.

[0087] Table 1 Wear resistance test of cable outer sheaths of Examples 1 to 6 and Comparative Examples 1 to 5

[0088]

[0089] As can be seen from Table 1, compared with Comparative Examples 1 to 5, the mass wear of the cable outer sheath prepared in Examples 1 to 6 is significantly reduced, indicating that the wear resistance of the cable outer sheath can be significantly improved by the combined use of N, N-di(hydroxyethyl)cocamide and dihydroxy aluminum stearate.

[0090] Experimental Example 2: Deformation resistance test

[0091] After mixing and cooling the components of the outer sheaths of Examples 6 to 11, cable outer sheath samples with a size of 80 mm × 10 mm × 4 mm were obtained. The flexural modulus was tested according to the method in GB / T 9341-2008 "Determination of Flexural Properties of Plastics". The test results are the average values ​​of 5 samples. The test results are shown in Table 2 below:

[0092] Table 2 Deformation resistance test of cable outer sheaths in Examples 6 to 11

[0093]

[0094] As can be seen from Table 2, compared with Example 6, the bending modulus of the cable outer sheaths of Examples 7 to 11 is improved, indicating that the use of polybutylene succinate to coat sillimanite can improve the deformation resistance of the cable outer sheath.

[0095] Experimental Example 3

[0096] The outer protective layer prepared in Example 1 was subjected to the following performance tests:

[0097] ① Test the oxygen index according to GB / T 2406.2-2009 "Determination of combustion behavior of plastics by oxygen index method Part 2: Room temperature test";

[0098] ② Refer to the method in GB / T 2951.11-2008 "General test methods for insulation and sheath materials of electric and optical cables Part 11: General test methods for thickness and dimensions - Mechanical properties test" to cut the outer sheath along the central axis to make a small dumbbell specimen with a thickness of 2mm, and perform the tensile strength test;

[0099] The test results are shown in Table 3 below:

[0100] Table 3 Test results of oxygen index and tensile strength of outer protective layer of Example 1

[0101]

[0102] 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 scope of protection of the present invention.

Claims

1. A wear-resistant cable, characterized in that: From the outside to the inside, it includes an outer sheath, an insulating layer and a conductor. The outer sheath includes the following components in parts by weight: 80 parts of polyurethane, 18-24 parts of high-density polyethylene, 4-6 parts of ethylene-butyl acrylate copolymer, 5-8 parts of ethylene-vinyl acetate copolymer, 10-20 parts of sillimanite, 4-8 parts of lubricating component, 20-30 parts of flame retardant, 1-3 parts of antioxidant, and 2-4 parts of plasticizer; The lubricating component comprises N,N-bis(hydroxyethyl)cocamide and aluminum dihydroxystearate in a weight ratio of 1:9 to 9:1; The weight of the N,N-bis(hydroxyethyl)cocamide is greater than or equal to the weight of the aluminum dihydroxystearate; The sillimanite is polybutylene succinate-coated sillimanite.

2. A wear-resistant cable according to claim 1, characterized in that: The weight ratio of the N,N-di(hydroxyethyl)cocamide to dihydroxy aluminum stearate is 2-5:

1.

3. The wear-resistant cable according to claim 1, characterized in that: The raw materials for the polybutylene succinate-coated sillimanite include sillimanite and polybutylene succinate in a weight ratio of 10:1-2.

4. The wear-resistant cable according to claim 1, characterized in that: The plasticizer is one or more of dioctyl phthalate, dibutyl phthalate, and diisononyl phthalate; and / or The flame retardant is one or more of magnesium hydroxide, aluminum hydroxide, tetrabromobisphenol A, and triphenyl phosphate; and / or The antioxidant is one or more of antioxidant 1098, antioxidant 264, and antioxidant 3114.

5. The wear-resistant cable according to claim 1, characterized in that: The insulating layer is a polyvinyl chloride insulating layer; The conductor is made of pure copper, copper alloy, or aluminum alloy.

6. A wear-resistant cable according to claim 4, characterized in that: When the flame retardant is magnesium hydroxide and triphenyl phosphate, the weight ratio of the magnesium hydroxide to triphenyl phosphate is 4-9:

1.

7. The method for preparing a wear-resistant cable according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, extruding the insulating layer and coating it on the surface of the conductor to form a conductor with the insulating layer coated on the surface; S2. Mixing the components of the outer sheath and extruding the mixture onto the surface of the conductor covered with the insulation layer to obtain the wear-resistant cable.

Images