Mining power cable with high wear resistance

Abstract

The invention relates to the technical field of cables, and provides a mining power cable with high wear resistance. The mining high-wear-resistant power cable comprises a conductor and a wear-resistant sheath layer coating the surface of the conductor, the wear-resistant sheath layer is prepared from the following raw materials in parts by weight: 95 to 105 parts of linear low-density polyethylene, 20 to 25 parts of organic montmorillonite / zirconium phosphate compound, 6 to 9 parts of aluminum hydroxide, 2 to 3 parts of ammonium polyphosphate, 3 to 5 parts of conductive carbon black, 5 to 7 parts of maleic anhydride grafted polyethylene, 0.5 to 0.6 part of anti-ultraviolet agent, 1 to 1.2 parts of dicumyl peroxide, 0.3 to 0.7 part of antioxidant and 0.8 to 1 part of lubricant. According to the mining high-wear-resistance power cable prepared in the invention, the balance of the performance of the mining high-wear-resistance power cable sheath material is improved, and the mining high-wear-resistance power cable sheath material has wear resistance and also has flexibility; the chemical corrosion resistance and the aging resistance of the mining high-wear-resistance power cable sheath material are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable, in particular, relates to a kind of mining high wear-resistant power cable. BACKGROUND

[0002] Mining power cable is mainly used to provide power support for various electrical equipment in mine, such as coal mining machine, heading machine, conveyor, ventilator, etc. It runs through all production links of mine, from power substation on the well to each working face underground, and undertakes the important task of power transmission, which is the "blood vessel" of mine power system. In different mine scenes, the laying mode of cable is various, including direct burial, overhead, hanging along the roadway wall, etc., and in the working process, it will be frequently dragged and bent with the movement of equipment, which puts high requirements on the mechanical properties of cable.

[0003] In mine operation, cable is subjected to extensive mechanical wear and tear. For example, when laying in the roadway, cable may rub against hard objects such as rocks and coal blocks; during equipment operation, cable may be stretched, extruded and repeatedly bent by equipment; in addition, during transportation and installation, improper operation may also cause damage to the surface of cable. Once the insulating layer or wear-resistant sheath layer of cable is damaged, not only the electrical properties of cable will be reduced, causing faults such as electric leakage and short circuit, but also serious accidents such as fire and explosion may occur, threatening the life safety of miners and the normal production of mine. Therefore, high wear resistance is one of the key properties of mining power cable, which can effectively improve the reliability and service life of cable, and reduce maintenance cost and safety risk.

[0004] The existing sheath materials of mining high wear-resistant power cable mostly only focus on the improvement of wear resistance, while ignoring the balance of other properties. For example, some high-hardness sheath materials have good wear resistance, but poor flexibility, which may crack when cable is bent; while some materials with good elasticity have insufficient wear resistance and are easily worn out. In addition, the chemical corrosion resistance and aging resistance of the material need to be further improved to adapt to the complex and variable environmental conditions of mine. In order to solve the above technical problems, the present application proposes a new mining high wear-resistant power cable. SUMMARY

[0005] The present application proposes a kind of mining high wear-resistant power cable, improves the balance of the performance of sheath material of mining high wear-resistant power cable, and has good wear resistance while considering flexibility; improve the chemical corrosion resistance and aging resistance of the sheath material of mining high wear-resistant power cable, to better adapt to the complex and variable environmental conditions of mine.

[0006] The technical scheme of the present application is as follows: In a first aspect, the present application provides a high wear-resistant power cable for mine, comprising a conductor and a wear-resistant sheath layer covering the surface of the conductor, wherein the wear-resistant sheath layer comprises the following raw materials in parts by weight: linear low density polyethylene 95-105 parts, organic montmorillonite / zirconium phosphate composite 20-25 parts, aluminum hydroxide 6-9 parts, ammonium polyphosphate 2-3 parts, conductive carbon black 3-5 parts, maleic anhydride grafted polyethylene 5-7 parts, anti-ultraviolet agent 0.5-0.6 parts, dicumyl peroxide 1-1.2 parts, antioxidant 0.3-0.7 parts, and lubricant 0.8-1 part.

[0007] As a further technical solution, the preparation method of the organic montmorillonite / zirconium phosphate composite comprises: dispersing zirconium phosphate in water to obtain a zirconium phosphate suspension, adding organic montmorillonite to the zirconium phosphate suspension, high-speed shearing at 65-75℃ and 10000-12000rpm for 60-80min, adjusting the pH to 8.5±0.1 with dilute ammonia water to obtain a reaction solution, and spray drying the reaction solution to obtain an organic montmorillonite / zirconium phosphate composite powder.

[0008] As a further technical solution, the inlet temperature of the spray drying is 175-185℃, and the outlet temperature is 75-85℃.

[0009] As a further technical solution, the amount ratio of the zirconium phosphate, water and organic montmorillonite is 25-35g:280-320mL:100-110g.

[0010] As a further technical solution, the preparation method of the organic montmorillonite comprises: adding sodium-based montmorillonite to 55-65℃ water under stirring at 450-550rpm to obtain a montmorillonite suspension, dissolving CTAB in 65-75℃ hot water to obtain a CTAB aqueous solution, then adding the montmorillonite suspension, stirring at 70-80℃ and 750-850rpm for 2-3h, and centrifuging, washing and drying to obtain the organic montmorillonite.

[0011] As a further technical solution, the weight ratio of the sodium-based montmorillonite and water in the montmorillonite suspension is 1g:5-6mL; and the amount ratio of the CTAB and water in the CTAB aqueous solution is 1.5g:35-40mL.

[0012] As a further technical solution, the weight ratio of the sodium-based montmorillonite and CTAB is 100:15-20.

[0013] As a further technical solution, the anti-ultraviolet agent is UV-944; the antioxidant comprises antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the lubricant comprises calcium stearate and polyethylene wax in a weight ratio of 2:1.

[0014] In a second aspect, the present application provides a preparation method of the high wear-resistant power cable for mine, which comprises the following steps: weighing raw materials according to a proportion, mixing 1 / 2 weight parts of linear low density polyethylene, organic montmorillonite / zirconium phosphate compound and maleic anhydride grafted polyethylene with 1 / 2 weight parts of lubricant, granulating to obtain wear-resistant master batch by using a double screw extruder at a temperature of 120-150 DEG C and a screw rotation speed of 150-200 rpm; mixing the wear-resistant master batch with the remaining linear low density polyethylene, conductive carbon black, aluminum hydroxide and ammonium polyphosphate at a temperature of 100-110 DEG C for 5-7 min, adding antioxidants, ultraviolet resistant agents and the remaining lubricant and continuing to mix for 3-5 min, finally adding dicumyl peroxide and mixing at a temperature of 110-120 DEG C for 2-4 min before discharging, extruding by using an extruder to coat the outer layer of the conductor, and cooling and shaping to obtain the high wear-resistant power cable for mine.

[0015] As a further technical solution, the extrusion coating step is: melting and plasticizing at a temperature of 130-150 DEG C, then controlling the extruder die temperature to be 170-180 DEG C, and extrusion coating after normal pressure steam crosslinking for 5-6 h at a temperature of 85-95 DEG C.

[0016] The working principle and beneficial effects of the present application are as follows: The present application realizes the synergistic optimization of wear resistance and flexibility of the sheath material by constructing a multi-phase reinforced system with organic montmorillonite / zirconium phosphate compound as the core. Organic montmorillonite (OMMT) and zirconium phosphate form an intercalation-exfoliation composite structure through high-speed shearing: the layered silicate structure of OMMT provides basic rigid support, and the interlayer phosphate groups of zirconium phosphate enhance the interface bonding with the OMMT layers through hydrogen bonding, forming a "rigid-flexible" alternating layered skeleton. When stressed, the rigid layers of zirconium phosphate bear the main wear stress, and the flexible layers of OMMT disperse the stress through interlayer sliding to avoid brittle fracture caused by local stress concentration. At the same time, maleic anhydride grafted polyethylene as a compatibilizer, its anhydride groups chemically react with the hydroxyl groups on the edge of OMMT to form a chemically bonded interface layer, which significantly improves the interfacial adhesion between the composite filler and the linear low density polyethylene (LLDPE) matrix, ensuring the stress transfer efficiency, thereby maintaining the material flexibility while maintaining high wear resistance.

[0017] In view of the problems of high temperature, humidity and chemical corrosion in mine environment, the application designs an aluminum hydroxide-ammonium polyphosphate synergistic flame-retardant system and an anti-aging system of anti-ultraviolet-antioxidant. The aluminum hydroxide decomposes and absorbs heat at 200-300 DEG C, reduces the surface temperature of the material, and the generated water vapor dilutes the combustible gas concentration; the ammonium polyphosphate decomposes at a higher temperature to form a phosphoric acid glassy covering layer to isolate oxygen and heat transfer. Both of them realize efficient smoke suppression and flame retardation through staged flame retardation. In terms of anti-aging, the anti-ultraviolet agent 944 absorbs ultraviolet light energy through the benzotriazole structure and converts it into harmless heat energy, while the antioxidant 1010 (hindered phenol) and 168 (phosphite) form a synergistic antioxidant network: 1010 captures free radicals to terminate chain oxidation reactions, and 168 decomposes hydroperoxide to generate stable products to prevent further decomposition of free radicals. This "light-heat" double protection mechanism significantly slows down the aging rate of the material in the high temperature environment of the mine.

[0018] To solve the problem of performance degradation caused by easy agglomeration of inorganic fillers, the application implements multi-scale regulation from molecular design to process control. At the molecular level, the organic montmorillonite is modified by CTAB (hexadecyl trimethyl ammonium bromide) intercalation, the long-chain alkyl group interacts with the non-polar segment of LLDPE through van der Waals force to reduce the surface energy of OMMT; after adjusting the pH of zirconium phosphate with dilute ammonia water, the surface phosphate group and the quaternary ammonium salt head group of CTAB form a double electric layer structure through electrostatic interaction to further enhance the dispersion stability. At the process level, a two-step granulation method is adopted: first, the organic montmorillonite / zirconium phosphate composite is premixed and granulated with part of LLDPE by high-speed shearing to form uniformly dispersed wear-resistant master particles; then, the remaining matrix and other additives are mixed again to avoid uneven dispersion caused by direct high filler content mixing. The spray drying process prevents the agglomeration of composite particles by rapid evaporation of water to ensure that the fillers are uniformly dispersed in the matrix at the nanoscale.

[0019] The application builds a multifunctional structure of "chemical crosslinking-physical entanglement-conductive network" by initiating LLDPE crosslinking with dicumyl peroxide (DCP) and combining the synergistic effect of conductive carbon black. The free radicals generated by the decomposition of DCP attack the LLDPE molecular chain to form C-C crosslinking bonds, improving the thermal stability and wear resistance of the material; at the same time, the conductive carbon black particles form chain-like or network-like conductive paths during melt blending, not only giving the material anti-static properties (preventing mine dust adsorption), but also acting as crosslinking points to promote physical entanglement between polymer chains and enhance the interfacial bonding force. In the extrusion crosslinking process, atmospheric steam crosslinking makes the crosslinking reaction proceed uniformly in three dimensions, avoiding the embrittlement caused by excessive local crosslinking; and the high temperature of the die ensures that the melt is fully plasticized to eliminate internal stress, finally forming a gradient crosslinking structure with a dense outer layer and a loose inner layer, balancing the surface wear resistance and overall flexibility. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only a 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 work, are within the scope of protection of the present application.

[0021] It should be noted that the linear low density polyethylene in the present application is LL7835A, which is purchased from Dongguan Hongchuang Plastic Co., Ltd.; the ammonium polyphosphate is purchased from Shanghai Maikelin Biochemical Technology Co., Ltd.; the maleic anhydride grafted polyethylene is CH905D purchased from Guangdong Chuanheng New Material Technology Co., Ltd.; and the polyethylene wax is H100 purchased from Qingdao Haijiao Chemical Co., Ltd.

[0022] Embodiment 1 The present embodiment provides a mine high wear-resistant power cable, which comprises a conductor and a wear-resistant sheath layer covering the surface of the conductor, and the wear-resistant sheath layer comprises the following raw materials in parts by weight: 100 parts of linear low density polyethylene, 22 parts of organicized montmorillonite / zirconium phosphate composite, 7 parts of aluminum hydroxide, 2.5 parts of ammonium polyphosphate, 4 parts of conductive carbon black, 6 parts of maleic anhydride grafted polyethylene, 0.55 parts of anti-ultraviolet agent, 1.1 parts of dicumyl peroxide, 0.5 parts of antioxidant and 0.9 parts of lubricant. The anti-ultraviolet agent is UV-944; the antioxidant comprises antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the lubricant comprises calcium stearate and polyethylene wax in a weight ratio of 2:1. The preparation method of the organicized montmorillonite / zirconium phosphate composite comprises the following steps: 100g sodium-based montmorillonite is added into 60℃ water and stirred and dispersed at 500rpm to obtain a montmorillonite suspension, 18g CTAB is dissolved in 70℃ hot water to obtain a CTAB aqueous solution, which is then added into the montmorillonite suspension, and stirring is carried out at 75℃ and 800rpm for 2.5h, and then centrifugal separation, washing and drying are carried out to obtain organicized montmorillonite; the amount ratio of sodium-based montmorillonite to water in the montmorillonite suspension is 1g:5.5mL; and the amount ratio of CTAB to water in the CTAB aqueous solution is 1.5g:38mL. 30g zirconium phosphate is dispersed in 300mL water to obtain a zirconium phosphate suspension, 105g organicized montmorillonite is added into the zirconium phosphate suspension, high-speed shearing is carried out at 70℃ and 11000rpm for 70min, dilute ammonia water is used to adjust the pH value to 8.5 to obtain a reaction liquid, and then spray drying is carried out on the reaction liquid to obtain an organicized montmorillonite / zirconium phosphate composite powder; the inlet temperature of the spray drying is 180℃, and the outlet temperature is 80℃.

[0023] The preparation method of the mine high wear-resistant power cable comprises the following steps: weighing raw materials according to proportions, mixing 1 / 2 weight parts of linear low-density polyethylene, organic montmorillonite / zirconium phosphate compound, maleic anhydride grafted polyethylene and 1 / 2 weight parts of lubricant, granulating to obtain wear-resistant master batch by using a double-screw extruder at a temperature of 135 DEG C and a screw rotation speed of 180 rpm; mixing the wear-resistant master batch with the remaining linear low-density polyethylene, conductive carbon black, aluminum hydroxide and ammonium polyphosphate at a temperature of 105 DEG C for 6 min, continuously mixing for 4 min by adding antioxidants, anti-ultraviolet agents and the remaining lubricant, finally mixing for 3 min by adding dicumyl peroxide at a temperature of 115 DEG C, discharging, melting and plasticizing by using an extruder at a temperature of 140 DEG C, then controlling the temperature of the extruder die head to be 175 DEG C, extruding to coat the outer layer of the conductor by performing normal-pressure steam crosslinking at a temperature of 90 DEG C for 5.5 h, and cooling and shaping.

[0024] Example 2 The embodiment provides a mine high wear-resistant power cable, which comprises a conductor and a wear-resistant sheath layer coated on the surface of the conductor, and the wear-resistant sheath layer comprises the following raw materials in parts by weight: 95 parts of linear low-density polyethylene, 20 parts of organic montmorillonite / zirconium phosphate compound, 6 parts of aluminum hydroxide, 2 parts of ammonium polyphosphate, 3 parts of conductive carbon black, 5 parts of maleic anhydride grafted PE, 0.5 part of anti-ultraviolet agent, 1 part of dicumyl peroxide, 0.3 part of antioxidant and 0.8 part of lubricant. The anti-ultraviolet agent is UV-944; the antioxidant comprises antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the lubricant comprises calcium stearate and polyethylene wax in a weight ratio of 2:1. The preparation method of the organic montmorillonite / zirconium phosphate compound comprises the following steps: 100 g of sodium-based montmorillonite is added into water at 55 DEG C and stirred and dispersed at 450 rpm to obtain a montmorillonite suspension; 15 g of CTAB is dissolved in hot water at 65 DEG C to obtain a CTAB aqueous solution, which is then added into the montmorillonite suspension, and stirred at 70 DEG C and 750 rpm for 2 h; after centrifugal separation, washing and drying, the organic montmorillonite is obtained; the weight ratio of sodium-based montmorillonite to water in the montmorillonite suspension is 1 g:5 mL; and the weight ratio of CTAB to water in the CTAB aqueous solution is 1.5 g:35 mL. 25 g of zirconium phosphate is dispersed in 280 mL of water to obtain a zirconium phosphate suspension; 100 g of the organic montmorillonite is added into the zirconium phosphate suspension, and high-speed shearing is performed at 65 DEG C and 10000 rpm for 60 min; the reaction liquid is obtained by adjusting the pH value to 8.5 by using dilute ammonia water; and the organic montmorillonite / zirconium phosphate compound powder is obtained by performing spray drying on the reaction liquid; the inlet temperature of the spray drying is 175 DEG C, and the outlet temperature is 75 DEG C.

[0025] The preparation method of the mine high wear-resistant power cable comprises the following steps: weighing raw materials according to proportions, mixing 1 / 2 weight parts of linear low-density polyethylene, organic montmorillonite / zirconium phosphate compound, maleic anhydride grafted polyethylene and 1 / 2 weight parts of lubricant, granulating to obtain wear-resistant master batch by using a double-screw extruder at a temperature of 120 DEG C and a screw rotation speed of 150 rpm; mixing the wear-resistant master batch with the remaining linear low-density polyethylene, conductive carbon black, aluminum hydroxide and ammonium polyphosphate at a temperature of 100 DEG C for 5 min, continuously mixing for 3 min by adding antioxidants, anti-ultraviolet agents and the remaining lubricant, finally mixing for 2 min by adding dicumyl peroxide at a temperature of 110 DEG C, discharging, melting and plasticizing by using an extruder at a temperature of 130 DEG C, then controlling the temperature of the extruder die head to be 170 DEG C, extruding to coat the outer layer of the conductor by performing normal-pressure steam crosslinking at a temperature of 85 DEG C for 5 h, and cooling and shaping.

[0026] Example 3 The embodiment provides a mine high wear-resistant power cable, which comprises a conductor and a wear-resistant sheath layer coated on the surface of the conductor, and the wear-resistant sheath layer comprises the following raw materials in parts by weight: linear low-density polyethylene 105 parts, organic montmorillonite / zirconium phosphate compound 25 parts, aluminum hydroxide 9 parts, ammonium polyphosphate 3 parts, conductive carbon black 5 parts, maleic anhydride grafted PE 7 parts, anti-ultraviolet agent 0.6 part, dicumyl peroxide 1.2 part, antioxidant 0.7 part and lubricant 1 part. The anti-ultraviolet agent is UV-944; the antioxidant comprises antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the lubricant comprises calcium stearate and polyethylene wax in a weight ratio of 2:1. The preparation method of the organic montmorillonite / zirconium phosphate compound comprises the following steps: 100 g sodium-based montmorillonite is added into water at 65 DEG C and stirred and dispersed at 550 rpm to obtain a montmorillonite suspension, 20 g CTAB is dissolved in hot water at 75 DEG C to obtain a CTAB aqueous solution, then the CTAB aqueous solution is added into the montmorillonite suspension, and stirring is performed at 80 DEG C and 850 rpm for 3 h, and then centrifugal separation, washing and drying are performed to obtain the organic montmorillonite; the weight ratio of sodium-based montmorillonite to water in the montmorillonite suspension is 1 g:6 mL; and the weight ratio of CTAB to water in the CTAB aqueous solution is 1.5 g:40 mL. 35 g zirconium phosphate is dispersed in 320 mL water to obtain a zirconium phosphate suspension, 110 g organic montmorillonite is added into the zirconium phosphate suspension, high-speed shearing is performed at 75 DEG C and 12000 rpm for 80 min, dilute ammonia water is used to adjust the pH value to 8.5 to obtain a reaction solution, the reaction solution is subjected to spray drying to obtain an organic montmorillonite / zirconium phosphate compound powder; the inlet temperature of the spray drying is 185 DEG C, and the outlet temperature is 85 DEG C.

[0027] The preparation method of the mine high wear-resistant power cable comprises the following steps: weighing raw materials according to proportions, mixing 1 / 2 weight parts of linear low-density polyethylene, organic montmorillonite / zirconium phosphate compound, maleic anhydride grafted polyethylene and 1 / 2 weight parts of lubricant, granulating to obtain wear-resistant master batch by using a double-screw extruder at a temperature of 150 DEG C and a screw rotation speed of 200 rpm; mixing the wear-resistant master batch with remaining linear low-density polyethylene, conductive carbon black, aluminum hydroxide and ammonium polyphosphate at a temperature of 110 DEG C for 7 min, continuously mixing for 5 min by adding antioxidants, anti-ultraviolet agents and remaining lubricant, discharging after mixing for 4 min by adding dicumyl peroxide at a temperature of 120 DEG C, melting and plasticizing by using an extruder at a temperature of 150 DEG C, then controlling the temperature of the extruder die head to be 180 DEG C, and extruding to coat the outer layer of the conductor after steam crosslinking at a temperature of 95 DEG C for 6 h, and cooling and shaping.

[0028] Example 4 On the basis of example 1, different from example 1, in this example, the steam crosslinking temperature is increased from 90 DEG C to 115 DEG C.

[0029] Example 5 On the basis of example 1, different from example 1, in this example, the ratio of calcium stearate to polyethylene wax in the lubricant is adjusted from 2:1 to 1:2.

[0030] Comparative Example 1 On the basis of example 1, different from example 1, in this comparative example, 22 parts of organic montmorillonite / zirconium phosphate compound are removed.

[0031] Comparative Example 2 On the basis of example 1, different from example 1, in this comparative example, 22 parts of organic montmorillonite / zirconium phosphate compound are replaced by an equal amount of pure organic montmorillonite.

[0032] Comparative Example 3 On the basis of example 1, different from example 1, in this comparative example, 22 parts of organic montmorillonite / zirconium phosphate compound are replaced by an equal amount of zirconium phosphate.

[0033] Comparative Example 4 On the basis of example 1, different from example 1, in this comparative example, 7 parts of aluminum hydroxide are removed.

[0034] Comparative Example 5 On the basis of example 1, different from example 1, in this comparative example, 2.5 parts of ammonium polyphosphate are removed.

[0035] Comparative Example 6 On the basis of Example 1, adjustment was made, and different from Example 1, in this comparative example, the conductive carbon black was reduced from 4 parts to 1 part.

[0036] Test Example 1: The mining high wear-resistant power cable prepared in the foregoing Examples 1-5 and Comparative Examples 1-6 was tested as follows: Tensile strength: tested according to GB / T 2951.11-2008, using a universal material testing machine, a clamp distance of 50 mm, a tensile speed of 300 mm / min, recording the maximum tension at the time of sample fracture, the tensile strength (N / mm 2 ) = maximum tension (N) / sample cross-sectional area (mm 2 ); Wear resistance: tested according to IEC 60245, fixing the cable sample on a grinding wheel abrasion testing machine, applying a pressure of 10 N, rubbing 1000 times at 40 r / min, measuring the abrasion amount of the cable surface; Moisture and heat aging resistance: after aging in a constant temperature and humidity chamber at 85°C / 85% RH for 30 days, testing the tensile strength after aging, calculating the retention rate of the tensile strength, and measuring the abrasion amount of the cable surface; Chemical corrosion resistance: after immersion in a 5% HCl solution for 72 h, testing the tensile strength, calculating the retention rate of the tensile strength, and measuring the abrasion amount of the cable surface according to the foregoing method; The test results are shown in Table 1 below: Table 1

[0037] In combination with the foregoing, the wear resistance and mechanical properties of Comparative Example 1 significantly decreased, and the performance attenuation after aging / corrosion was the most serious; the absence of composite fillers led to loose material structure, loss of wear-resistant framework, and a significant reduction in environmental tolerance. The wear resistance and strength of Comparative Example 2 were lower than those of Example 1, and the wear loss after aging / corrosion significantly increased; a single montmorillonite could not form a rigid support for zirconium phosphate, and the synergistic reinforcing effect of the composite material was missing. The performance of Comparative Example 3 was slightly better than that of Comparative Example 2 but still weaker than that of Example 1, and the wear loss after aging was high; zirconium phosphate was not rigid enough and had poor dispersibility, and did not form an interlaced reinforcing structure with the montmorillonite layers. The initial wear resistance of Comparative Example 4 was close to that of Example, but the performance decreased significantly after aging / corrosion; the absence of aluminum hydroxide weakened the flame-retardant system and material density, resulting in a reduction in environmental tolerance. The performance of Comparative Example 5 was similar to that of Comparative Example 4, and the tensile strength retention rate after aging significantly decreased; the synergistic flame-retardant and cross-linking promotion effect of ammonium polyphosphate was lost, and the thermal stability of the material decreased. The wear resistance of Comparative Example 6 slightly decreased, but the aging / corrosion resistance was better than that of the other comparative examples; carbon black was not enough to reduce wear resistance and electrical conductivity, but its high chemical stability slowed down environmental erosion. The initial strength of Example 4 slightly decreased, and the wear loss after aging / corrosion significantly increased; high temperature led to excessive cross-linking, material embrittlement, and an increase in microcracks, which accelerated environmental erosion. The initial wear resistance of Example 5 decreased, but the chemical corrosion resistance was maintained well; the increase in the proportion of polyethylene wax weakened the interfacial bonding force, but the increase in hydrophobicity slowed down the penetration of acid liquid.

[0038] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high wear-resistant power cable for mining, characterized in that: The invention comprises a conductor and a wear-resistant sheath layer coated on the surface of the conductor. The wear-resistant sheath layer comprises the following raw materials in parts by weight: 95-105 parts of linear low-density polyethylene, 20-25 parts of an organic montmorillonite / zirconium phosphate composite, 6-9 parts of aluminum hydroxide, 2-3 parts of ammonium polyphosphate, 3-5 parts of conductive carbon black, 5-7 parts of maleic anhydride grafted polyethylene, 0.5-0.6 parts of an anti-ultraviolet agent, 1-1.2 parts of dicumyl peroxide, 0.3-0.7 parts of an antioxidant and 0.8-1 parts of a lubricant.

2. A high wear-resistant power cable for mining according to claim 1, characterized in that: The preparation method of the organized montmorillonite / zirconium phosphate composite comprises: dispersing zirconium phosphate in water to obtain a zirconium phosphate suspension, adding the organized montmorillonite to the zirconium phosphate suspension, high-speed shearing at 65-75°C and 10,000-12,000 rpm for 60-80 minutes, adjusting the pH to 8.5±0.1 with dilute ammonia water to obtain a reaction solution, and spray-drying the reaction solution to obtain the organized montmorillonite / zirconium phosphate composite powder.

3. A high wear-resistant power cable for mining according to claim 2, characterized in that: The inlet temperature of the spray drying is 175-185°C, and the outlet temperature is 75-85°C.

4. A high wear-resistant power cable for mining according to claim 2, characterized in that: The usage ratio of the zirconium phosphate, water and organized montmorillonite is 25-35 g: 280-320 mL: 100-110 g.

5. A high wear-resistant power cable for mining according to claim 2, characterized in that: The preparation method of the organized montmorillonite comprises: adding sodium montmorillonite to water at 55-65°C and stirring and dispersing at 450-550 rpm to obtain a montmorillonite suspension; dissolving CTAB in hot water at 65-75°C to obtain a CTAB aqueous solution; then adding the CTAB aqueous solution to the montmorillonite suspension; stirring and reacting at 70-80°C and 750-850 rpm for 2-3 hours; and centrifuging, washing, and drying to obtain the obtained product.

6. A high wear-resistant power cable for mining according to claim 5, characterized in that: The usage ratio of sodium montmorillonite to water in the montmorillonite suspension is 1 g: 5-6 mL; the usage ratio of CTAB to water in the CTAB aqueous solution is 1.5 g: 35-40 mL.

7. A high wear-resistant power cable for mining according to claim 5, characterized in that: The weight ratio of the sodium montmorillonite to CTAB is 100:15-20.

8. The high wear-resistant power cable for mining according to claim 1, characterized in that: The anti-ultraviolet agent is UV-944; the antioxidant includes antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the lubricant includes calcium stearate and polyethylene wax in a weight ratio of 2:

1.

9. A method for preparing a high wear-resistant power cable for mining according to any one of claims 1 to 8, characterized in that the steps include: Raw materials are weighed in proportion, 1 / 2 part by weight of linear low-density polyethylene, an organized montmorillonite / zirconium phosphate composite, maleic anhydride grafted polyethylene and 1 / 2 part by weight of a lubricant are mixed, and granulated using a twin-screw extruder at a temperature of 120-150° C. and a screw speed of 150-200 rpm to obtain a wear-resistant masterbatch; the wear-resistant masterbatch is mixed with the remaining linear low-density polyethylene, conductive carbon black, aluminum hydroxide and ammonium polyphosphate, and mixed at a temperature of 100-110° C. for 5-7 minutes, an antioxidant, an anti-ultraviolet agent and the remaining lubricant are added and mixed for 3-5 minutes, and finally dicumyl peroxide is added and mixed at a temperature of 110-120° C. for 2-4 minutes before discharging, extruding and coating on the outer layer of the conductor using an extruder, and cooling and shaping to obtain the product.

10. The method for preparing a high wear-resistant power cable for mining according to claim 9, characterized in that: The extrusion coating step comprises: melting and plasticizing at a temperature of 130-150° C., then controlling the extruder die head temperature to 170-180° C., performing normal pressure steam crosslinking at a temperature of 85-95° C. for 5-6 hours, and then extruding and coating.

Images