High-brightness passive light-emitting soft cable for open-pit mine and preparation method thereof

Abstract

The application relates to the technical field of electric wire and cable, and discloses an open-pit mine high-brightness passive light-emitting flexible cable and a preparation method thereof. The open-pit mine high-brightness passive light-emitting flexible cable comprises a power line core (1), an LED lamp strip (2), a grounding line conductor (3), a detection line (4), an inner sheath layer (5), a reinforcing layer (6) and an outer sheath layer (7). The outer sheath layer (7) is prepared from the following raw materials in parts by weight: 70-90 parts of polyurethane, 20-25 parts of a flame retardant, 15-20 parts of high-density polyethylene, 10-14 parts of an ethylene-methyl acrylate copolymer, 10-20 parts of a filler, 1-3 parts of an antioxidant, 2-3 parts of a plasticizer and 2-4 parts of a compatilizer. The filler is prepared from the following raw materials: silicon dioxide, melamine, dodecylamine and polyvinylpyrrolidone. The technical scheme can solve the problem of poor wear resistance of the mine cable in the related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric wire and cable, in particular, to a high-brightness passive light-emitting flexible cable for open-pit mine and a preparation method thereof. BACKGROUND

[0002] The open-pit mine is usually operated continuously for 24 hours, and the lighting facilities are limited in coverage at night or in dim light environment. The traditional cable has no obvious identification, and is easily damaged by moving equipment. Not only does it affect the production efficiency, but also it may cause safety hazards. Moreover, the unclear cable laying path also brings great inconvenience to inspection and maintenance, increases the operation risk and maintenance cost. Therefore, the high-brightness passive light-emitting flexible cable becomes the preferred type for open-pit mine. Through the passive light-emitting technology, the transparent material such as polyurethane is used as the sheath layer, which can continuously release high-brightness light at night, clearly identify the laying path, improve the visibility, effectively avoid the risk of equipment damage, reduce the incidence of safety accidents, and facilitate the positioning and troubleshooting of inspection personnel, and improve the maintenance efficiency.

[0003] At the same time, due to the frequent movement of mining, transportation and other equipment during mining, the wear resistance of the cable is also required. At present, in order to improve the wear resistance of the sheath of the mine cable, the technical means of adding inorganic fillers such as silicon dioxide in the outer sheath layer matrix is generally used. However, due to the high surface energy of silicon dioxide, it is easy to agglomerate and difficult to disperse uniformly, so that its enhancement effect on wear resistance cannot be well played. Therefore, it is necessary to propose a high-brightness passive light-emitting flexible cable for open-pit mine with good wear resistance and a preparation method thereof, so as to meet the core needs of open-pit mine operation, improve the production efficiency and safety of mine. SUMMARY

[0004] The present application provides a high-brightness passive light-emitting flexible cable for open-pit mine and a preparation method thereof, which solves the problem of poor wear resistance of the mine cable in the related art.

[0005] The technical scheme of the present application is as follows:

[0006] The present application provides a high-brightness passive light-emitting flexible cable for open-pit mine, which comprises a power line core, an LED lamp strip, a grounding line conductor, a detection line, an inner sheath layer, a reinforcing layer and an outer sheath layer.

[0007] The outer sheath layer comprises the following components by weight: polyurethane 70-90 parts, flame retardant 20-25 parts, high-density polyethylene 15-20 parts, ethylene-methyl acrylate copolymer 10-14 parts, filler 10-20 parts, antioxidant 1-3 parts, plasticizer 2-3 parts, and compatibilizer 2-4 parts.

[0008] The filler comprises raw materials of the following components in parts by weight: 100 parts of silicon dioxide, 16.8-19.2 parts of melamine, 4.8-7.2 parts of dodecylamine, and 2-3 parts of polyvinylpyrrolidone.

[0009] As a further technical solution, the power line core is cabled with the LED lamp strip, the ground line conductor and the detection line; the power line core comprises a power line core conductor and a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer I, an isolation layer and a metal shielding layer II arranged in sequence on the outer side of the power line core conductor; and the detection line comprises a detection line conductor and a detection line insulation layer arranged on the outer side of the detection line conductor.

[0010] As a further technical solution, the mass ratio of melamine to dodecylamine is 3:1.

[0011] As a further technical solution, the preparation method of the filler comprises the following steps:

[0012] A1, the formaldehyde aqueous solution is warmed to 60-65℃, and after the pH is adjusted to be alkaline, melamine and dodecylamine are sequentially added and mixed to obtain a prepolymer solution;

[0013] A2, the silicon dioxide and polyvinylpyrrolidone are dispersed in water to obtain a silicon dioxide dispersion;

[0014] A3, the prepolymer solution and the silicon dioxide dispersion are once mixed, the pH is adjusted to be acidic, and then secondary mixing is performed, and the filler is obtained after drying.

[0015] As a further technical solution, in step A1, the pH is adjusted to be alkaline, specifically: a 10wt% sodium carbonate solution is used to adjust the pH to 8.5-9.5.

[0016] As a further technical solution, in step A1, the mixing temperature is 70-75℃, and the mixing time is 20-40min.

[0017] As a further technical solution, in step A1, the mass fraction of formaldehyde in the formaldehyde aqueous solution is 37wt%.

[0018] As a further technical solution, in step A1, the mass ratio of the sum of the mass of melamine and dodecylamine to the mass of the formaldehyde aqueous solution is 3:12.5.

[0019] As a further technical solution, in step A2, the mass-to-volume ratio of the silicon dioxide to water is 1g:10mL.

[0020] As a further technical solution, in step A3, the pH is adjusted to be acidic, specifically: using a 10wt% acetic acid aqueous solution to adjust the pH to 5.0~5.5.

[0021] As a further technical solution, before adjusting the pH to be acidic, cooling is performed.

[0022] As a further technical solution, in step A3, the temperature of the first mixing is 55~65℃, and the time is 25~35min; the temperature of the second mixing is 55~65℃, and the time is 2~4h.

[0023] As a further technical solution, the ethylene-methyl acrylate copolymer includes a first ethylene-methyl acrylate copolymer and a second ethylene-methyl acrylate copolymer; the methyl acrylate contents of the first and second ethylene-methyl acrylate copolymers are different.

[0024] As a further technical solution, the methyl acrylate content of the first ethylene-methyl acrylate copolymer is 14wt%; the methyl acrylate content of the second ethylene-methyl acrylate copolymer is 24wt%.

[0025] The open-pit mine high-brightness passive light-emitting soft cable can improve the mechanical strength of the outer sheath layer of the cable by compounding ethylene-methyl acrylate copolymers with different methyl acrylate contents into the outer sheath layer. The first ethylene-methyl acrylate copolymer with a low methyl acrylate content has a higher proportion of ethylene segments in the molecular chain, and has better compatibility with high-density polyethylene, which can enhance the entanglement between molecular chains and improve the tensile strength of the material; the second ethylene-methyl acrylate copolymer with a high methyl acrylate content has a relatively high proportion of polar groups, which can interact with the polar groups in the polyurethane matrix, and the two synergistically improve the mechanical strength of the outer sheath layer of the open-pit mine high-brightness passive light-emitting soft cable.

[0026] As a further technical solution, the mass ratio of the first ethylene-methyl acrylate copolymer to the second ethylene-methyl acrylate copolymer is 2~3:1, preferably 2.5:1.

[0027] As a further technical solution, the flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

[0028] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 1076, and antioxidant 168.

[0029] As a further technical solution, the plasticizer includes one or both of epoxidized soybean oil and epoxidized octyl stearate.

[0030] As a further technical solution, the compatibility agent is maleic anhydride grafted polyethylene.

[0031] As a further technical solution, the ground wire conductor is a tinned copper wire.

[0032] As a further technical solution, the detection line conductor is a tinned copper wire, and the detection line insulation layer is an ethylene-propylene-diene rubber material.

[0033] As a further technical solution, the conductor is a tinned copper wire.

[0034] As a further technical solution, the power line core preparation method comprises the following steps:

[0035] B1, the conductor shielding layer material is extruded and wrapped outside the power line core conductor to form a conductor shielding layer;

[0036] B2, the insulation layer material is extruded and wrapped outside the conductor shielding layer to form an insulation layer;

[0037] B3, the insulation shielding layer material is extruded and wrapped outside the insulation layer to form an insulation shielding layer;

[0038] B4, the metal shielding layer I material is wound outside the insulation shielding layer to form a metal shielding layer I;

[0039] B5, the isolation layer material is uniformly wrapped along the outer periphery of the metal shielding layer I to form an isolation layer,

[0040] B6, the metal shielding layer II material is wound outside the isolation layer in a braided manner to form a metal shielding layer II, thereby obtaining the power line core.

[0041] As a further technical solution, the conductor shielding layer is a cross-linked polyethylene material, the insulation layer is an ethylene-propylene-diene rubber material; the insulation shielding layer is a cross-linked polyethylene material; the metal shielding layer I material is an aluminum-plastic composite tape; the metal shielding layer II material is a tinned copper wire; and the isolation layer is a polypropylene wrapping tape.

[0042] The application also provides a preparation method of the high-brightness passive light-emitting soft cable for open-pit mines, which comprises the following steps:

[0043] S1, the inner sheath layer material is extruded and wrapped outside the cable core composed of the power line core, the LED lamp strip, the ground wire conductor and the detection line to form an inner sheath layer;

[0044] S2, the reinforcing layer material is wound outside the inner sheath layer to form a reinforcing layer;

[0045] S3, the outer sheath layer raw material is mixed and then extruded and wrapped outside the reinforcing layer to form an outer sheath layer, thereby obtaining the high-brightness passive light-emitting soft cable for open-pit mines.

[0046] As a further technical solution, the inner sheath layer is a polyurethane material, and the reinforcing layer is a Kevlar aramid cloth.

[0047] The working principle and beneficial effects of the present application are as follows:

[0048] 1、The open-pit mine high-brightness passive light-emitting flexible cable can be driven by a power line core to work, and the LED light strip can be lit without external power supply, ensuring that the cable realizes visual function at night and ensuring safe use of the cable during operation.

[0049] 2、The open-pit mine high-brightness passive light-emitting flexible cable can improve the wear resistance of the outer sheath layer of the open-pit mine high-brightness passive light-emitting flexible cable by adding a filler composed of silicon dioxide, melamine, dodecylamine and polyvinylpyrrolidone in the outer sheath layer. Among them, polyvinylpyrrolidone as a dispersant for silicon dioxide can be connected with part of the silicon hydroxyl on the surface of silicon dioxide, realizing dispersion effect while still retaining part of the active silicon hydroxyl; melamine and dodecylamine act as a complex monomer to form a coating layer on the surface of the silicon dioxide particles; the coating layer can fully cover and consume the active silicon hydroxyl remaining on the surface of silicon dioxide, greatly weakening the hydrogen bond action between particles, effectively inhibiting the agglomeration of silicon dioxide, and significantly improving the dispersion stability and interfacial bonding force of the filler in the cable sheath layer; at the same time, the side groups of polyvinylpyrrolidone can promote melamine and dodecylamine to form a more dense and firm coating layer through hydrogen bond force, improve the coating stability and bonding strength, thereby realizing the effect of improving the wear resistance of the outer sheath of the open-pit mine cable. BRIEF DESCRIPTION OF DRAWINGS

[0050] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0051] Figure 1 Figure 1 is a structural schematic diagram of the open-pit mine high-brightness passive light-emitting flexible cable of the present application embodiment 1;

[0052] In the figure: 1, power line core; 11, power line core conductor; 12, conductor shield layer; 13, insulating layer; 14, insulating shield layer; 15, metal shield layer I; 16, isolation layer; 17, metal shield layer II; 2, LED light strip; 3, ground wire conductor; 4, detection line; 41, detection line conductor; 42, detection line insulating layer; 5, inner sheath layer; 6, reinforcing layer; 7, outer sheath layer. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort are within the protection scope of the present application.

[0054] In the following examples and comparative examples, the polyurethane is model T3190; the magnesium hydroxide has a particle size of 5 μm; the aluminum hydroxide has a particle size of 5 μm; the high-density polyethylene is item DMDA-8008H; the first ethylene-methyl acrylate copolymer is model 1214AC; the second ethylene-methyl acrylate copolymer is model 1224AC; the silicon dioxide has a particle size of 20 nm; the epoxy soybean oil is item 072610, purchased from China Aviation New Materials (Shandong) Co., Ltd.; the maleic anhydride grafted polyethylene is item HT20E100, purchased from Shangxi (Shanghai) Chemical Auxiliary Co., Ltd.; and the polyvinylpyrrolidone is model PVP-K30.

[0055] Example 1

[0056] A high-brightness passive light-emitting flexible cable for open-pit mines comprises a power line core 1, an LED lamp strip 2, a grounding line conductor 3, a detection line 4, an inner sheath layer 5, a reinforcing layer 6, and an outer sheath layer 7; the power line core 1 is cabled with the LED lamp strip 2, the grounding line conductor 3, and the detection line 4; the power line core 1 comprises a power line core conductor 11 and, in sequence, a conductor shielding layer 12, an insulating layer 13, an insulating shielding layer 14, a metal shielding layer I 15, an isolation layer 16, and a metal shielding layer II 17 arranged outside the power line core conductor 11; and the detection line 4 comprises a detection line conductor 41 and a detection line insulating layer 42 arranged outside the detection line conductor 41.

[0057] The outer sheath layer 7 comprises the following components by weight: 70 parts of polyurethane, 20 parts of magnesium hydroxide, 15 parts of high-density polyethylene, 10 parts of ethylene-methyl acrylate copolymer, 10 parts of filler, 1 part of antioxidant 1010, 2 parts of epoxy soybean oil, and 2 parts of maleic anhydride grafted polyethylene; the ethylene-methyl acrylate copolymer is the first ethylene-methyl acrylate copolymer.

[0058] The preparation method of the filler comprises the following steps:

[0059] A1. 100 parts of a formaldehyde aqueous solution with a mass fraction of 37 wt% is warmed to 65℃, a sodium carbonate solution with a mass fraction of 10 wt% is used to adjust the pH to 8.5, 16.8 parts of melamine and 7.2 parts of dodecylamine are sequentially added, and the mixture is mixed at 70℃ for 30 min to obtain a prepolymer solution;

[0060] A2, 100 parts of silica, 2.5 parts of polyvinylpyrrolidone were dispersed in water to obtain a silica dispersion; the mass-volume ratio of silica and water was 1 g:10 mL;

[0061] A3, the prepolymer solution and the silica dispersion were mixed once at a temperature of 60 DEG C for 30 min, then cooled to 25 DEG C, and then adjusted to pH 5.0 using a 10wt% acetic acid aqueous solution, and then mixed twice at a temperature of 55 DEG C for 4 h, and then dried to obtain the filler;

[0062] A preparation method of a high-brightness passive light-emitting soft cable for open-pit mines, comprising the following steps:

[0063] S1, a polyurethane material is extruded and wrapped outside the cable core composed of a power line core 1, an LED lamp strip 2, a grounding conductor 3 and a detection line 4 to form an inner sheath layer 5; wherein the grounding conductor 3 is a tinned copper wire; the detection line 4 comprises a tinned copper wire conductor and a ternary ethylene-propylene rubber material extruded and wrapped outside the tinned copper wire conductor;

[0064] S2, Kevlar aramid cloth is wound outside the inner sheath layer 5 to form a reinforcing layer 6;

[0065] S3, the outer sheath layer raw material is mixed and extruded and wrapped outside the reinforcing layer 6 to form an outer sheath layer 7, thereby obtaining a high-brightness passive light-emitting soft cable for open-pit mines;

[0066] The preparation method of the power line core comprises the following steps:

[0067] B1, a polyethylene material is extruded and wrapped outside the power line core conductor 11 to form a conductor shielding layer 12 after cross-linking;

[0068] B2, a ternary ethylene-propylene rubber material is extruded and wrapped outside the conductor shielding layer 12 to form an insulating layer 13;

[0069] B3, a polyethylene material is extruded and wrapped outside the insulating layer 13 to form an insulating shielding layer 14 after cross-linking;

[0070] B4, an aluminum plastic composite tape is wound outside the insulating shielding layer 14 to form a metal shielding layer I 15;

[0071] B5, a polypropylene wrapping tape is uniformly wrapped along the outer periphery of the metal shielding layer I 15 to form an isolation layer 16,

[0072] B6, a tinned copper wire is wound outside the isolation layer 16 in a braided manner to form a metal shielding layer II 17, thereby obtaining the power line core 1;

[0073] The structure of the high-brightness passive light-emitting soft cable for open-pit mines prepared in Example 1 is shown in Figure 1 .

[0074] Embodiment 2

[0075] A high-brightness passive light-emitting flexible cable for open-pit mine comprises a power line core 1, an LED light strip 2, a grounding line conductor 3, a detection line 4, an inner sheath layer 5, a reinforcing layer 6, and an outer sheath layer 7; the power line core 1 is cabled with the LED light strip 2, the grounding line conductor 3, and the detection line 4; the power line core 1 comprises a power line core conductor 11 and, in sequence, a conductor shielding layer 12, an insulating layer 13, an insulating shielding layer 14, a metal shielding layer I 15, an isolation layer 16, and a metal shielding layer II 17 arranged outside the power line core conductor 11; the detection line 4 comprises a detection line conductor 41 and a detection line insulating layer 42 arranged outside the detection line conductor 41;

[0076] The outer sheath layer 7 comprises the following raw materials in parts by weight: polyurethane 80 parts, aluminum hydroxide 23 parts, high-density polyethylene 18 parts, ethylene-methyl acrylate copolymer 12 parts, filler 15 parts, antioxidant 1076 2 parts, octyl epoxy stearate 2.5 parts, and maleic anhydride grafted polyethylene 3 parts; the ethylene-methyl acrylate copolymer is a first ethylene-methyl acrylate copolymer;

[0077] A preparation method of a filler comprises the following steps:

[0078] A1, warm 100 parts of a formaldehyde aqueous solution with a mass fraction of 37wt% to 65℃, adjust the pH to 9.0 using a sodium carbonate solution with a mass fraction of 10wt%, and then add 16.8 parts of melamine and 7.2 parts of dodecylamine in sequence, mix at 75℃ for 30min, and obtain a prepolymer solution;

[0079] A2, disperse 100 parts of silicon dioxide and 2.5 parts of polyvinylpyrrolidone in water to obtain a silicon dioxide dispersion; the mass-volume ratio of silicon dioxide and water is 1g:10mL;

[0080] A3, after mixing the prepolymer solution and the silicon dioxide dispersion once at a temperature of 60℃ for 30min, cool to 25℃, adjust the pH to 5.0 using a 10wt% acetic acid aqueous solution, and then mix again at a temperature of 60℃ for 3h, dry to obtain the filler;

[0081] A preparation method of a high-brightness passive light-emitting flexible cable for open-pit mine, same as Embodiment 1.

[0082] Embodiment 3

[0083] A kind of high-brightness passive light soft cable for open-pit mine, including power line core 1, LED lamp strip 2, ground wire conductor 3, detection line 4, inner sheath layer 5, reinforcing layer 6, outer sheath layer 7;Power line core 1 and LED lamp strip 2, ground wire conductor 3, detection line 4 are made into cable with core;Power line core 1 includes power line core conductor 11 and conductor shielding layer 12, insulating layer 13, insulating shielding layer 14, metal shielding layer I 15, isolation layer 16, metal shielding layer II 17 that are sequentially arranged on the outside of power line core conductor 11;Detection line 4 includes detection line conductor 41 and detection line insulating layer 42 arranged on the outside of detection line conductor 41;

[0084] Outer sheath layer 7 includes the following weight parts components raw materials: polyurethane 90 parts, aluminum hydroxide 25 parts, high-density polyethylene 20 parts, ethylene-methyl acrylate copolymer 14 parts, filler 20 parts, antioxidant 168 3 parts, octyl epoxy stearate 3 parts, maleic anhydride grafted polyethylene 4 parts;Ethylene-methyl acrylate copolymer is the first ethylene-methyl acrylate copolymer;

[0085] The preparation method of the filler comprises the following steps:

[0086] A1, 100 parts of 37wt% formaldehyde aqueous solution is warmed to 65 DEG C, and the pH is adjusted to 9.5 using 10wt% sodium carbonate solution, and 16.8 parts of melamine and 7.2 parts of dodecylamine are sequentially added, and mixed at 75 DEG C for 30 min to obtain a prepolymer solution;

[0087] A2, 100 parts of silica, 2.5 parts of polyvinylpyrrolidone are dispersed in water to obtain a silica dispersion; the mass-volume ratio of silica and water is 1g:10ml;

[0088] A3, the prepolymer solution and the silica dispersion are mixed once at a temperature of 60 DEG C for 30 min, then cooled to 25 DEG C, and then adjusted to pH 5.0 using 10wt% acetic acid aqueous solution, and then mixed twice at a temperature of 65 DEG C for 2h, and then dried to obtain the filler;

[0089] A kind of high-brightness passive light soft cable for open-pit mine of preparation method, same as example 1.

[0090] Example 4

[0091] Compared with example 1, the difference of the present embodiment is only that, in the present embodiment, melamine is 18 parts, and dodecylamine is 6 parts.

[0092] Example 5

[0093] Compared with example 1, the difference of the present embodiment is only that, in the present embodiment, melamine is 19.2 parts, and dodecylamine is 4.8 parts.

[0094] Example 6

[0095] Compared with Example 1, the only difference of the present example is that the ethylene-methyl acrylate copolymer in the present example is composed of the first ethylene-methyl acrylate copolymer and the second ethylene-methyl acrylate copolymer with a mass ratio of 2:1.

[0096] Example 7

[0097] Compared with Example 1, the only difference of the present example is that the ethylene-methyl acrylate copolymer in the present example is composed of the first ethylene-methyl acrylate copolymer and the second ethylene-methyl acrylate copolymer with a mass ratio of 2.5:1.

[0098] Example 8

[0099] Compared with Example 1, the only difference of the present example is that the ethylene-methyl acrylate copolymer in the present example is composed of the first ethylene-methyl acrylate copolymer and the second ethylene-methyl acrylate copolymer with a mass ratio of 3:1.

[0100] Example 9

[0101] Compared with Example 1, the only difference of the present example is that the ethylene-methyl acrylate copolymer in the present example is the second ethylene-methyl acrylate copolymer.

[0102] Comparative Example 1

[0103] Compared with Example 1, the only difference of the present comparative example is that the preparation method of the filler in the present comparative example replaces the dodecylamine with an equal amount of melamine.

[0104] Comparative Example 2

[0105] Compared with Example 1, the only difference of the present comparative example is that the preparation method of the filler in the present comparative example comprises the following steps:

[0106] A1, 100 parts of a formaldehyde aqueous solution with a mass fraction of 37wt% is warmed to 65℃, a sodium carbonate solution with a mass fraction of 10wt% is used to adjust the pH to 8.5, 16.8 parts of melamine and 7.2 parts of dodecylamine are sequentially added, and the mixture is mixed at 70℃ for 30min to obtain a prepolymer solution; the mass ratio of melamine to the formaldehyde aqueous solution is 1:6;

[0107] A2, 100 parts of silica is dispersed in water to obtain a silica dispersion; the mass-volume ratio of silica to water is 1g:10mL;

[0108] A3. The prepolymer solution and silica dispersion are mixed once at 60°C for 30 min, cooled to 25°C, and the pH is adjusted to 5.0 with a 10 wt% acetic acid aqueous solution. The mixture is then mixed a second time at 55°C for 4 h and dried to obtain the filler.

[0109] Comparative Example 3

[0110] Compared with Example 1, the only difference in this comparative example is that the filler is replaced with an equal amount of silica.

[0111] The outer sheath of the high-brightness passive light-emitting flexible cables for open-pit mines prepared in Examples 1-9 and Comparative Examples 1-3 was tested according to the following method:

[0112] 1. Wear resistance test: The outer sheath layers of Examples 1-5 and Comparative Examples 1-3 were prepared into specimens with dimensions of 30mm×7mm×6mm. Mass wear test was carried out according to the method in GB / T 3960-2016 "Plastics Sliding Friction and Wear Test Method". The test result is the average value of the three specimens. The test ring speed was 200r / min, the test time was 2h, and the load was 196N.

[0113] 2. Tensile strength test: Referring to the methods in GB / T 2951.11-2008 "General test methods for insulation and sheath materials of cables and optical fibers - Part 11: General test methods for thickness and dimensional measurement and mechanical properties test", dumbbell specimens with a thickness of 2 mm were made from the outer sheath layers of Examples 1, 6-9 for tensile strength testing; the total distance between the clamps was 34 mm, and the clamp moving speed was 25 mm / min;

[0114] The test results are shown in Tables 1 and 2:

[0115] Table 1. Test results of abrasion resistance of the outer sheath of high-brightness passive luminous flexible cable for open-pit mining.

[0116]

[0117] The data in Table 1 show that the addition of fillers composed of silica, melamine, dodecylamine and polyvinylpyrrolidone can improve the wear resistance of the outer sheath of high-brightness passive light-emitting flexible cables for open-pit mines.

[0118] Table 2. Test results of the tensile strength of the outer sheath of high-brightness passive luminous flexible cable for open-pit mines.

[0119]

[0120] The data in Table 2 show that when the ethylene-methyl acrylate copolymer in the present application is composed of a first ethylene-methyl acrylate copolymer and a second ethylene-methyl acrylate copolymer with two different methyl acrylate contents, the tensile strength of the outer sheath layer of the high-brightness passive light-emitting soft cable for open-pit mines can be improved.

[0121] The above only is the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-brightness passive light-emitting flexible cable for use in open-pit mines, characterized in that, The power line core (1), the LED lamp strip (2), the grounding line conductor (3), the detection line (4), the inner sheath layer (5), the reinforcing layer (6) and the outer sheath layer (7) are arranged in the cable core. The outer sheath layer (7) comprises the following raw materials in parts by weight: polyurethane 70-90 parts, flame retardant 20-25 parts, high-density polyethylene 15-20 parts, ethylene-methyl acrylate copolymer 10-14 parts, filler 10-20 parts, antioxidant 1-3 parts, plasticizer 2-3 parts, and compatibilizer 2-4 parts. The filler comprises the following raw materials in parts by weight: silicon dioxide 100 parts, melamine 16.8-19.2 parts, dodecylamine 4.8-7.2 parts, and polyvinylpyrrolidone 2-3 parts. The preparation method of the filler comprises the following steps: A1, the formaldehyde aqueous solution is warmed to 60-65℃, and after adjusting the pH to be alkaline, melamine and dodecylamine are sequentially added and mixed to obtain a prepolymer solution; A2, the silicon dioxide and polyvinylpyrrolidone are dispersed in water to obtain a silicon dioxide dispersion; A3, the prepolymer solution and the silicon dioxide dispersion are once mixed, the pH is adjusted to be acidic, and then twice mixed, and the filler is obtained after drying.

2. The high-brightness passive light-emitting flexible cable for open-pit mine according to claim 1, characterized in that, The power line core (1), the LED lamp strip (2), the grounding line conductor (3), and the detection line (4) are arranged in the cable core; the power line core (1) comprises a power line core conductor (11) and a conductor shielding layer (12), an insulation layer (13), an insulation shielding layer (14), a metal shielding layer I (15), an isolation layer (16), and a metal shielding layer II (17) arranged outside the power line core conductor (11) in sequence; and the detection line (4) comprises a detection line conductor (41) and a detection line insulation layer (42) arranged outside the detection line conductor (41).

3. The high-brightness passive light-emitting flexible cable for open-pit mine according to claim 1, characterized in that, In step A1, the pH is adjusted to be alkaline, specifically: a 10wt% sodium carbonate solution is used to adjust the pH to 8.5-9.

5.

4. The high-brightness, passive light-emitting flexible cable for use in surface mines according to claim 1, characterized in that, In step A1, the mixing temperature is 70-75℃, and the mixing time is 20-40min.

5. The high-brightness, passive light-emitting flexible cable for use in surface mines according to claim 1, characterized in that, In step A3, the pH is adjusted to be acidic, specifically: a 10wt% acetic acid aqueous solution is used to adjust the pH to 5.0-5.

5.

6. The high-brightness, passive light-emitting flexible cable for use in surface mines according to claim 1, characterized in that, The ethylene-methyl acrylate copolymer comprises a first ethylene-methyl acrylate copolymer and a second ethylene-methyl acrylate copolymer; the first ethylene-methyl acrylate copolymer and the second ethylene-methyl acrylate copolymer have different methyl acrylate contents.

7. The high-brightness, passive light-emitting flexible cable for use in surface mines according to claim 6, characterized in that, The methyl acrylate content of the first ethylene-methyl acrylate copolymer is 14wt%; and the methyl acrylate content of the second ethylene-methyl acrylate copolymer is 24wt%.

8. The high-brightness, passive light-emitting flexible cable for use in surface mines according to claim 7, characterized in that, The mass ratio of the first ethylene-methyl acrylate copolymer to the second ethylene-methyl acrylate copolymer is 2-3:

1.

9. A method for producing a high-brightness passive light-emitting flexible cable for open-pit mines, for producing a high-brightness passive light-emitting flexible cable for open-pit mines according to any one of claims 1 to 8, characterized in that, The steps comprise: S1, the inner sheath layer material is extruded and wrapped outside the cable core composed of the power line core (1), the LED lamp strip (2), the grounding line conductor (3), and the detection line (4) to form the inner sheath layer (5); S2, the reinforcing layer material is wound outside the inner sheath layer (5) to form the reinforcing layer (6); S3, after mixing the outer sheath layer raw material, extruding and wrapping outside the reinforcing layer (6) to form the outer sheath layer (7), obtaining the high-brightness passive light-emitting soft cable for open-pit mine.

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