Composite rubber sleeve for intelligent mining equipment cable and preparation method of composite rubber sleeve

Abstract

The invention relates to the technical field of composite rubber jackets for cables. The composite rubber sleeve is prepared from the following raw materials in parts by weight: 60 to 80 parts of chlorinated polyethylene rubber, 40 to 60 parts of ethylene propylene diene monomer, 20 to 30 parts of carbon black, 10 to 20 parts of precipitated calcium carbonate, 6 to 10 parts of talcum powder, 4 to 6 parts of filler, 2 to 4 parts of anti-aging agent, 3 to 5 parts of magnesium oxide, 0.6 to 0.8 part of paraffin, 0.2 to 0.4 part of polyethylene wax, 0.4 to 0.6 part of microcrystalline wax, 2 to 4 parts of antimony trioxide, 2 to 4 parts of chlorinated paraffin and 1 to 3 parts of additive. According to the invention, KH570 provides a reactive methacryloyloxy group which can also participate in a vulcanization system reaction, so that the interface bonding performance of the quartz powder, the mica powder and a material matrix is effectively improved, the strength performance of the composite rubber sleeve is effectively improved, and the service life of the composite rubber sleeve is effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of composite sheath technology for cables, specifically a composite sheath for cables used in intelligent mining equipment and its preparation method. Background Technology

[0002] Composite sheaths for cables are typically made from rubber as the base material through blending and extrusion molding. They can ensure the safety of cable transmission and are mainly used in power cables, communication cables and other fields. They are especially suitable for complex working conditions such as outdoor and underground applications.

[0003] In existing technologies, composite sheaths for cables are subjected to prolonged stress during use, making them prone to breakage and damage, thus affecting their service life. Therefore, this invention provides a composite sheath for cables used in intelligent mining equipment and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a composite sheath for cables of intelligent mining equipment and its preparation method. The composite sheath prepared by this invention not only has good tensile strength properties, but also excellent elongation at break properties, effectively improving the performance of the composite sheath.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a composite sheath for cables of intelligent mining equipment, comprising the following raw materials in parts by weight: 60-80 parts chlorinated polyethylene rubber, 40-60 parts ethylene propylene diene monomer (EPDM) rubber, 20-30 parts carbon black, 10-20 parts precipitated calcium carbonate, 6-10 parts talc, 4-6 parts filler, 2-4 parts antioxidant, 3-5 parts magnesium oxide, 0.6-0.8 parts paraffin wax, 0.2-0.4 parts polyethylene wax, 0.4-0.6 parts microcrystalline wax, 2-4 parts antimony trioxide, 2-4 parts chlorinated paraffin wax, and 1-3 parts additives; The filler is prepared by the following method: S1: Powder preparation, the raw materials of the powder include polyvinylidene fluoride, N,N-dimethylformamide, nano alumina, nano zinc oxide, KH550, and sodium dodecylbenzene sulfonate; S2: Preparation of the mixture, the raw materials of which include quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600, and the mass of the mixture is 20-30% of the mass of the powder; S3: Mixing treatment, the powder and the mixture are mixed to obtain the filler.

[0006] Further, the method for preparing the powder is as follows: polyvinylidene fluoride and N,N-dimethylformamide are stirred under nitrogen protection at a temperature of 50-60℃ for 1-2 hours to obtain a mixture. The mixture, nano-alumina, nano-zinc oxide, KH550, and sodium dodecylbenzenesulfonate are added to a reaction vessel. The reaction vessel is set at a temperature of 60-70℃ and a stirring speed of 300-500 rpm. The mixture is stirred at a constant temperature for 30-40 minutes. The resulting product is then placed in a vacuum drying oven at a temperature of 50-60℃ and a pressure of -0.09--0.1 MPa for 24-36 hours. The resulting product is then pulverized to obtain the powder.

[0007] Furthermore, the mass ratio of polyvinylidene fluoride and N,N-dimethylformamide is 1:(2-3), and the mass ratio of the mixture, nano-alumina, nano-zinc oxide, KH550, and sodium dodecylbenzenesulfonate is 1:(0.2-0.4):(0.1-0.3):(0.04-0.06):(0.04-0.06).

[0008] Further, the method for preparing the mixture is as follows: Quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 are added to a mixer, which is set to 200-400 rpm and stirred for 2-4 hours. The resulting product is filtered using a nylon filter cloth and then fed into a spray fluidized bed. The hot air temperature is set to 110-130°C, and the resulting product is added back to the mixer. 20-30% of the product mass of activated carbon particles are added to the mixer, which is then stirred at 400-600 rpm for 40-60 minutes. After filtration using a filter cloth, the resulting product is sent to an oven and dried at 50-60°C for 4-6 hours to obtain the mixture.

[0009] Furthermore, the mass ratio of quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 is 1:(1.2-1.4):(0.02-0.04):(0.03-0.05):(0.01-0.03):(0.2-0.4):(0.02-0.04).

[0010] Furthermore, the particle size of quartz powder and mica powder is ≤5μm, the pore size of nylon filter cloth is 8~12μm, and the particle size of activated carbon particles is 1~10mm. The pore size of the filter cloth is smaller than that of the activated carbon particles.

[0011] Furthermore, the mixing process is as follows: the powder and the mixture are added to a mixer, and the mixer is set to 60-100 rpm for 20-40 minutes to obtain the filler.

[0012] Furthermore, the antioxidant is selected from N-isopropyl-N'-phenyl-p-phenylenediamine, and the carbon black is selected from N550 carbon black.

[0013] Furthermore, the additive is prepared by mixing di-tert-butylperoxyisopropylbenzene, diisopropylbenzene peroxide, and difurfuryl acetone, with the mass ratio of di-tert-butylperoxyisopropylbenzene, diisopropylbenzene peroxide, and difurfuryl acetone being 1:(0.3-0.5):(0.4-0.6).

[0014] Secondly, this invention also provides a method for preparing composite rubber sleeves for cables of intelligent mining equipment. Chlorinated polyethylene rubber and EPDM rubber are weighed as needed and added to a two-roll mill. The temperature is set to 40–50°C and the mixture is treated for 1.5–2.5 hours. An antioxidant is added and the mixture is treated for 20–30 minutes. Magnesium oxide, paraffin wax, polyethylene wax, and microcrystalline wax are added and the mixture is treated for 6–10 minutes. Carbon black, precipitated calcium carbonate, and talc are added and the mixture is treated for 1–2 hours. Antimony trioxide and chlorinated paraffin wax are added and the mixture is treated for 40–60 seconds. Fillers and additives are added and the mixture is treated for 60–80 seconds. Finally, the mixture is heated to 88–98°C. The rubber is discharged from the bottom and the resulting product is added to an internal mixer. The internal mixer is set to a temperature of 90-110℃, a speed of 30-50 rpm, and a pressure of 1-2 MPa. The mixing process is carried out for 20-30 minutes. After discharge, the resulting product is sheeted and cooled. The resulting product is then fed into a single-screw extruder. The die head temperature is set to 100-120℃ and the screw speed is set to 20-40 rpm. The resulting product is subjected to a vulcanization reaction. The vulcanization temperature is set to 160-180℃, the vulcanization time is set to 20-40 minutes, and the vulcanization pressure is set to 10-15 MPa to obtain a composite rubber sleeve for cables of intelligent mining equipment.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the addition of quartz powder and mica powder to the filler during the preparation of the composite rubber sleeve can provide hardness and rigidity. Mica powder, as a sheet-like filler, can effectively improve the modulus and the tensile properties of the material. Vinyltrimethoxysilane can provide reactive vinyl groups to co-crosslink with the subsequent vulcanization system. KH570 provides reactive methacryloyloxy groups, which can also participate in the vulcanization system reaction, effectively improving the interfacial bonding performance between quartz powder, mica powder and the material matrix, thereby effectively improving the strength and service life of the composite rubber sleeve.

[0016] 2. In this invention, by adding polyvinylidene fluoride (PVDF) to the powder, PVDF can act as a carrier and physically entangle with the material matrix. Nano-alumina and nano-zinc oxide, as nanoparticles, provide rigidity reinforcement for the PVDF filling structure and increase the specific surface area. Furthermore, nano-zinc oxide can act as a thermally conductive filler during the molding and preparation of the composite sleeve, improving the bonding reaction efficiency of each material, making the stress transmission of the composite sleeve more uniform, and improving the strength performance of the composite sleeve. Attached Figure Description

[0017] Figure 1 This invention provides a formula diagram for a composite sheath for cables used in intelligent mining equipment and its preparation method. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0020] Example 1: Raw material preparation: 60 parts chlorinated polyethylene rubber, 40 parts ethylene propylene diene monomer (EPDM) rubber, 20 parts carbon black, 10 parts precipitated calcium carbonate, 6 parts talc, 4 parts filler, 2 parts antioxidant, 3 parts magnesium oxide, 0.6 parts paraffin wax, 0.2 parts polyethylene wax, 0.4 parts microcrystalline wax, 2 parts antimony trioxide, 2 parts chlorinated paraffin wax, 1 part additive. The antioxidant is N-isopropyl-N'-phenyl-p-phenylenediamine, the carbon black is N550 carbon black, and the additive is a mixture of di-tert-butylperoxyisopropylbenzene, diisopropylbenzene peroxide, and difurfuryl acetone, with a mass ratio of 1:0.3:0.4. Packing material preparation: S1: Powder preparation, the raw materials of the powder include polyvinylidene fluoride, N,N-dimethylformamide, nano alumina, nano zinc oxide, KH550, and sodium dodecylbenzene sulfonate; The method for preparing the powder is as follows: Polyvinylidene fluoride and N,N-dimethylformamide are stirred at 50°C under nitrogen protection for 1 hour to obtain a mixed solution. The mixed solution, nano-alumina, nano-zinc oxide, KH550, and sodium dodecylbenzenesulfonate are added to a reaction vessel. The reaction vessel is set at 60°C and the stirring speed is 300 rpm. The mixture is stirred at a constant temperature for 30 minutes. The resulting product is sent to a vacuum drying oven at 50°C and a pressure of -0.09 MPa for 24 hours. The resulting product is then pulverized to obtain the powder. The mass ratio of polyvinylidene fluoride and N,N-dimethylformamide is 1:2, and the mass ratio of the mixed solution, nano-alumina, nano-zinc oxide, KH550, and sodium dodecylbenzenesulfonate is 1:0.2:0.1:0.04:0.04. S2: Preparation of the mixture, the raw materials of which include quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600, and the mass of the mixture is 20% of the mass of the powder; The method for preparing the mixture is as follows: Quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 are added to a mixer. The mixer is set to 200 rpm and stirred for 2 hours. The resulting product is filtered using a nylon filter cloth and then fed into a spray fluidized bed. The hot air temperature is set to 110℃. The resulting product is then added back to the mixer, along with 20% (by weight) of activated carbon granules. The mixer is set to 400 rpm and stirred for 40 minutes. Afterward, the mixture is used... The filter cloth is filtered, and the resulting product is sent to an oven and dried at 50°C for 4 hours to obtain a mixture. The mass ratio of quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 is 1:1.2:0.02:0.03:0.01:0.2:0.02. The particle size of quartz powder and mica powder is ≤5μm, the pore size of nylon filter cloth is 8μm, and the particle size of activated carbon particles is 1mm. The pore size of the filter cloth is smaller than that of the activated carbon particles. S3: Mixing process, the powder and the mixture are mixed to obtain the filler; The mixing process is as follows: the powder and the mixture are added to a mixer, the mixer is set to 60 rpm and stirred for 20 minutes to obtain the filler; Preparation of finished product: Weigh out chlorinated polyethylene rubber and EPDM rubber as needed and add them to a two-roll mill. Set the temperature to 40℃ and treat for 1.5 hours. Add antioxidant and treat for 20 minutes. Add magnesium oxide, paraffin wax, polyethylene wax, and microcrystalline wax and treat for 6 minutes. Add carbon black, precipitated calcium carbonate, and talc powder and treat for 1 hour. Add antimony trioxide and chlorinated paraffin wax and treat for 40 seconds. Add fillers and additives and treat for 60 seconds. Then discharge the rubber at 88℃. Add the resulting product to a mixer. Set the mixer temperature to 90℃, the speed to 30 rpm, and the pressure to 1 MPa. Mix for 20 minutes. After discharge, the resulting product is sheeted and cooled. The resulting product is sent to a single-screw extruder. Set the die head temperature to 100℃ and the screw speed to 20 rpm. The resulting product is subjected to a vulcanization reaction. Set the vulcanization temperature to 160℃, the vulcanization time to 20 minutes, and the vulcanization pressure to 10 MPa to obtain a composite rubber sleeve for cables of intelligent mining equipment.

[0021] Example 2: Raw material preparation: 70 parts chlorinated polyethylene rubber, 50 parts ethylene propylene diene monomer (EPDM) rubber, 25 parts carbon black, 15 parts precipitated calcium carbonate, 8 parts talc, 5 parts filler, 3 parts antioxidant, 4 parts magnesium oxide, 0.7 parts paraffin wax, 0.3 parts polyethylene wax, 0.5 parts microcrystalline wax, 3 parts antimony trioxide, 3 parts chlorinated paraffin wax, 2 parts additives. The antioxidant is N-isopropyl-N'-phenyl-p-phenylenediamine, the carbon black is N550 carbon black, and the additive is prepared by mixing di-tert-butylperoxyisopropylbenzene, diisopropylbenzene peroxide, and difurfuryl acetone, with a mass ratio of 1:0.4:0.5. Packing material preparation: S1: Powder preparation, the raw materials of the powder include polyvinylidene fluoride, N,N-dimethylformamide, nano alumina, nano zinc oxide, KH550, and sodium dodecylbenzene sulfonate; The method for preparing the powder is as follows: Polyvinylidene fluoride and N,N-dimethylformamide are stirred at 55℃ under nitrogen protection for 1.5h to obtain a mixed solution. The mixed solution, nano alumina, nano zinc oxide, KH550, and sodium dodecylbenzenesulfonate are added to a reaction vessel. The reaction vessel is set at 65℃ and the stirring speed is 400rpm. The mixture is stirred at a constant temperature for 35min. The resulting product is sent to a vacuum drying oven, which is set at 55℃ and the pressure is -0.095MPa for 30h. The resulting product is then pulverized to obtain the powder. The mass ratio of polyvinylidene fluoride and N,N-dimethylformamide is 1:2.5, and the mass ratio of the mixed solution, nano alumina, nano zinc oxide, KH550, and sodium dodecylbenzenesulfonate is 1:0.3:0.2:0.05:0.05. S2: Preparation of the mixture, the raw materials of which include quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600, and the mass of the mixture is 25% of the mass of the powder; The method for preparing the mixture is as follows: Quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 are added to a mixer. The mixer is set to 300 rpm and stirred for 3 hours. The resulting product is filtered using a nylon filter cloth and then fed into a spray fluidized bed. The hot air temperature is set to 120°C. The resulting product is then added back to the mixer, along with 25% (by weight) of activated carbon granules. The mixer is stirred at 500 rpm for 50 minutes. Afterward, the mixture is used... The filter cloth is filtered, and the resulting product is sent to an oven and dried at 55°C for 5 hours to obtain a mixture. The mass ratio of quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 is 1:1.3:0.03:0.04:0.02:0.3:0.03. The particle size of quartz powder and mica powder is ≤5μm, the pore size of nylon filter cloth is 10μm, and the particle size of activated carbon particles is 5mm. The pore size of the filter cloth is smaller than that of the activated carbon particles. S3: Mixing process, the powder and the mixture are mixed to obtain the filler; The mixing process is as follows: the powder and the mixture are added to a mixer, the mixer is set to 80 rpm and stirred for 30 minutes to obtain the filler; Preparation of finished product: Weigh out chlorinated polyethylene rubber and EPDM rubber as needed and add them to a two-roll mill. Set the temperature to 45℃ and treat for 2 hours. Add antioxidant and treat for 25 minutes. Add magnesium oxide, paraffin wax, polyethylene wax, and microcrystalline wax and treat for 8 minutes. Add carbon black, precipitated calcium carbonate, and talc powder and treat for 1.5 hours. Add antimony trioxide and chlorinated paraffin wax and treat for 50 seconds. Add fillers and additives and treat for 70 seconds. Then discharge the rubber at 93℃. Add the resulting product to a mixer. Set the mixer temperature to 100℃, the speed to 40 rpm, and the pressure to 1.5 MPa. Mix for 25 minutes. After discharge, the resulting product is sheeted and cooled. The resulting product is sent to a single-screw extruder. Set the die head temperature to 110℃ and the screw speed to 30 rpm. The resulting product is subjected to a vulcanization reaction. Set the vulcanization temperature to 170℃, the vulcanization time to 30 minutes, and the vulcanization pressure to 12 MPa to obtain a composite rubber sleeve for cables of intelligent mining equipment.

[0022] Example 3: Raw material preparation: 80 parts chlorinated polyethylene rubber, 60 parts ethylene propylene diene monomer (EPDM) rubber, 30 parts carbon black, 20 parts precipitated calcium carbonate, 10 parts talc, 6 parts filler, 4 parts antioxidant, 5 parts magnesium oxide, 0.8 parts paraffin wax, 0.4 parts polyethylene wax, 0.6 parts microcrystalline wax, 4 parts antimony trioxide, 4 parts chlorinated paraffin wax, 3 parts additives; The antioxidant is N-isopropyl-N'-phenyl-p-phenylenediamine, the carbon black is N550 carbon black, and the additive is prepared by mixing di-tert-butylperoxyisopropylbenzene, diisopropylbenzene peroxide, and difurfuryl acetone, with a mass ratio of 1:0.5:0.6. Packing material preparation: S1: Powder preparation, the raw materials of the powder include polyvinylidene fluoride, N,N-dimethylformamide, nano alumina, nano zinc oxide, KH550, and sodium dodecylbenzene sulfonate; The method for preparing the powder is as follows: Polyvinylidene fluoride and N,N-dimethylformamide are stirred at 60℃ under nitrogen protection for 2 hours to obtain a mixed solution. The mixed solution, nano-alumina, nano-zinc oxide, KH550, and sodium dodecylbenzenesulfonate are added to a reaction vessel. The reaction vessel is set at 70℃ and the stirring speed is 500 rpm. The mixture is stirred at a constant temperature for 40 minutes. The resulting product is sent to a vacuum drying oven, which is set at 60℃ and the pressure is -0.1 MPa for 36 hours. The resulting product is then pulverized to obtain the powder. The mass ratio of polyvinylidene fluoride and N,N-dimethylformamide is 1:3, and the mass ratio of the mixed solution, nano-alumina, nano-zinc oxide, KH550, and sodium dodecylbenzenesulfonate is 1:0.4:0.3:0.06:0.06. S2: Preparation of the mixture, the raw materials of which include quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600, and the mass of the mixture is 30% of the mass of the powder; The method for preparing the mixture is as follows: Quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 are added to a mixer. The mixer is set to 400 rpm and stirred for 4 hours. The resulting product is filtered using a nylon filter cloth. The resulting product is then fed into a spray fluidized bed with a hot air temperature set to 130℃. The resulting product is added back to the mixer, along with 30% (by weight) of activated carbon granules. The mixer is stirred at 600 rpm for 60 minutes. The mixture is then filtered... The filter cloth is filtered, and the resulting product is sent to an oven and dried at 60°C for 6 hours to obtain a mixture. The mass ratio of quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 is 1:1.4:0.04:0.05:0.03:0.4:0.04. The particle size of quartz powder and mica powder is ≤5μm, the pore size of nylon filter cloth is 12μm, and the particle size of activated carbon particles is 10mm. The pore size of the filter cloth is smaller than that of the activated carbon particles. S3: Mixing process, the powder and the mixture are mixed to obtain the filler; The mixing process is as follows: the powder and the mixture are added to a mixer, the mixer is set to 100 rpm and stirred for 40 minutes to obtain the filler; Preparation of finished product: Weigh out chlorinated polyethylene rubber and EPDM rubber as needed and add them to a two-roll mill. Set the temperature to 50℃ and treat for 2.5 hours. Add antioxidant and treat for 30 minutes. Add magnesium oxide, paraffin wax, polyethylene wax, and microcrystalline wax and treat for 10 minutes. Add carbon black, precipitated calcium carbonate, and talc and treat for 2 hours. Add antimony trioxide and chlorinated paraffin wax and treat for 60 seconds. Add fillers and additives and treat for 80 seconds. Then discharge the rubber at 98℃. Add the resulting product to a mixer. Set the mixer temperature to 110℃, the speed to 50 rpm, and the pressure to 2 MPa. Mix for 30 minutes. After discharge, the resulting product is sheeted and cooled. The resulting product is sent to a single-screw extruder. Set the die head temperature to 120℃ and the screw speed to 40 rpm. The resulting product is subjected to a vulcanization reaction. Set the vulcanization temperature to 180℃, the vulcanization time to 40 minutes, and the vulcanization pressure to 15 MPa to obtain a composite rubber sleeve for cables of intelligent mining equipment.

[0023] Comparative Example 1: The difference between this comparative example and Example 1 is that this comparative example does not contain nano-alumina or nano-zinc oxide.

[0024] Comparative Example 2 differs from Example 1 in that it does not contain powder; instead, an equal amount of mixture is used to replace the filler.

[0025] Comparative Example 3 differs from Example 1 in that it does not contain filler.

[0026] Performance testing: Performance tests were conducted on the composite sleeves prepared in Examples 1, 2, 3, 1, 2, and 3 (Comparative Examples). The test data are recorded in the table below: Table 1

[0027] It is evident that the tensile strength and elongation at break of the composite sleeves prepared in Comparative Examples 1, 2, and 3 are all lower than those in Examples 1, 2, and 3. This indicates that in the preparation of the composite sleeves, the addition of quartz powder and mica powder to the fillers can provide hardness and rigidity. Mica powder, as a sheet-like filler, can effectively improve the modulus and tensile properties of the material. Vinyltrimethoxysilane can provide reactive vinyl groups, which can co-crosslink with the subsequent vulcanization system. KH570 provides reactive methacryloyloxy groups, which can also participate in the vulcanization system reaction, effectively improving the properties of quartz powder and mica powder. The interfacial bonding performance between the masterbatch and the material matrix effectively improves the strength performance of the composite sleeve. By adding polyvinylidene fluoride (PVDF) to the powder, PVDF can act as a carrier and physically entangle with the material matrix. Nano-alumina and nano-zinc oxide, as nanoparticles, provide rigidity reinforcement for the PVDF filling structure and increase the specific surface area. Furthermore, nano-zinc oxide can act as a thermally conductive filler during the molding and preparation of the composite sleeve, improving the bonding reaction efficiency of each material, resulting in more uniform stress transmission in the composite sleeve and enhancing its strength performance.

[0028] By comparing and analyzing the relevant data in the table, it can be seen that the composite sheath prepared by this invention not only has good tensile strength properties but also excellent elongation at break properties. This indicates that the composite sheath for intelligent mining equipment cables provided by this invention has a broader market prospect and is more suitable for widespread application.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A composite rubber sleeve for cables of intelligent mining equipment, characterized in that: The raw materials include the following parts by weight: 60-80 parts chlorinated polyethylene rubber, 40-60 parts ethylene propylene diene monomer (EPDM) rubber, 20-30 parts carbon black, 10-20 parts precipitated calcium carbonate, 6-10 parts talc, 4-6 parts filler, 2-4 parts antioxidant, 3-5 parts magnesium oxide, 0.6-0.8 parts paraffin wax, 0.2-0.4 parts polyethylene wax, 0.4-0.6 parts microcrystalline wax, 2-4 parts antimony trioxide, 2-4 parts chlorinated paraffin wax, and 1-3 parts additives; The filler is prepared by the following method: S1: Powder preparation, the raw materials of the powder include polyvinylidene fluoride, N,N-dimethylformamide, nano alumina, nano zinc oxide, KH550, and sodium dodecylbenzene sulfonate; S2: Preparation of the mixture, the raw materials of which include quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600, and the mass of the mixture is 20-30% of the mass of the powder; S3: Mixing treatment, the powder and the mixture are mixed to obtain the filler.

2. The composite sheath for cables of intelligent mining equipment according to claim 1, characterized in that, The method for preparing the powder is as follows: polyvinylidene fluoride and N,N-dimethylformamide are stirred at a temperature of 50-60℃ under nitrogen protection for 1-2 hours to obtain a mixture. The mixture, nano-alumina, nano-zinc oxide, KH550, and sodium dodecylbenzenesulfonate are added to a reaction vessel. The reaction vessel is set at a temperature of 60-70℃ and a stirring speed of 300-500 rpm. The mixture is stirred at a constant temperature for 30-40 minutes. The resulting product is then placed in a vacuum drying oven at a temperature of 50-60℃ and a pressure of -0.09--0.1 MPa for 24-36 hours. The resulting product is then pulverized to obtain the powder.

3. The composite sheath for cables of intelligent mining equipment according to claim 2, characterized in that, The mass ratio of polyvinylidene fluoride and N,N-dimethylformamide is 1:(2-3), and the mass ratio of the mixture, nano alumina, nano zinc oxide, KH550, and sodium dodecylbenzenesulfonate is 1:(0.2-0.4):(0.1-0.3):(0.04-0.06):(0.04-0.06).

4. The composite sheath for cables of intelligent mining equipment according to claim 1, characterized in that, The method for preparing the mixture is as follows: Quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 are added to a mixer. The mixer is set to 200-400 rpm and stirred for 2-4 hours. The resulting product is filtered using a nylon filter cloth. The resulting product is then fed into a spray fluidized bed with a hot air temperature set to 110-130°C. The resulting product is then added back to the mixer, along with 20-30% (by weight) of activated carbon granules. The mixer is set to 400-600 rpm and stirred for 40-60 minutes. After filtration using a filter cloth, the resulting product is sent to an oven and dried at 50-60°C for 4-6 hours to obtain the mixture.

5. The composite sheath for cables of intelligent mining equipment according to claim 4, characterized in that, The mass ratio of quartz powder, mica powder, vinyltrimethoxysilane, KH570, dodecyltrimethylammonium chloride, sodium lignosulfonate, and polyethylene glycol 600 is 1:(1.2-1.4):(0.02-0.04):(0.03-0.05):(0.01-0.03):(0.2-0.4):(0.02-0.04).

6. The composite sheath for cables of intelligent mining equipment according to claim 4, characterized in that, The particle size of quartz powder and mica powder is ≤5μm, the pore size of nylon filter cloth is 8~12μm, and the particle size of activated carbon particles is 1~10mm. The pore size of the filter cloth is smaller than that of the activated carbon particles.

7. The composite sheath for cables of intelligent mining equipment according to claim 1, characterized in that, The mixing process is as follows: the powder and the mixture are added to a mixer, and the mixer is set to 60-100 rpm for 20-40 minutes to obtain the filler.

8. The composite sheath for cables of intelligent mining equipment according to claim 1, characterized in that, The antioxidant is N-isopropyl-N'-phenyl-p-phenylenediamine, and the carbon black is N550 carbon black.

9. The composite sheath for cables of intelligent mining equipment according to claim 1, characterized in that, The additive is prepared by mixing di-tert-butylperoxyisopropylbenzene, diisopropylbenzene peroxide, and difurfuryl acetone, with the mass ratio of di-tert-butylperoxyisopropylbenzene, diisopropylbenzene peroxide, and difurfuryl acetone being 1:(0.3-0.5):(0.4-0.6).

10. The method for preparing composite sheaths for cables of intelligent mining equipment according to any one of claims 1 to 9, characterized in that, Weigh out chlorinated polyethylene rubber and ethylene propylene diene monomer (EPDM) rubber as needed and add them to a two-roll mill. Set the temperature to 40–50°C and treat for 1.5–2.5 hours. Add antioxidants and treat for 20–30 minutes. Add magnesium oxide, paraffin wax, polyethylene wax, and microcrystalline wax and treat for 6–10 minutes. Add carbon black, precipitated calcium carbonate, and talc powder and treat for 1–2 hours. Add antimony trioxide and chlorinated paraffin wax and treat for 40–60 seconds. Add fillers and additives and treat for 60–80 seconds. Then discharge the rubber at 88–98°C. Add the resulting product to a three-stage mixer. The mill is set to a temperature of 90–110℃, a speed of 30–50 rpm, and a pressure of 1–2 MPa. The internal mixing process lasts for 20–30 minutes. After discharge, the product is sheeted and cooled. The resulting product is then fed into a single-screw extruder, where the die head temperature is set to 100–120℃ and the screw speed to 20–40 rpm. The resulting product undergoes a vulcanization reaction, with the vulcanization temperature set to 160–180℃ and the vulcanization time to 20–40 minutes. The vulcanization pressure is 10–15 MPa, thus producing a composite rubber sleeve for cables used in intelligent mining equipment.

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