Wear-resistant high-strength silane crosslinked polyethylene insulation material and preparation method thereof

Abstract

The invention relates to the technical field of insulating materials, in particular to a wear-resistant high-strength silane crosslinked polyethylene insulating material and a preparation method thereof. The wear-resistant high-strength silane crosslinked polyethylene insulating material comprises the following raw materials in parts by weight: 60-80 parts of polyethylene, 10-14 parts of polyvinyl alcohol, 2-4 parts of a silane coupling agent, 2-4 parts of a reinforcing material, 2-4 parts of an additive, 1-3 parts of a nucleating agent, 1-3 parts of a lubricant, 0.6-0.8 part of a flame retardant and 0.4-0.6 part of an antioxidant. According to the invention, the reinforcing material is added in the preparation process of the polyethylene insulating material, particles of the nano titanium dioxide can be uniformly dispersed in a polyethylene matrix, a better structure supporting effect is achieved, the wear resistance of the insulating material is improved, and the aluminum borate whisker can be matched with the nano titanium dioxide to further improve the performance of the polyethylene matrix; the EVA rubber and the zirconium dioxide are matched for use, so that the effect of enhancing the toughness of the polyethylene matrix can be achieved, and the overall strength of the polyethylene insulating material is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of insulating materials, in particular to a wear-resistant high-strength silane cross-linked polyethylene insulating material and a preparation method thereof. Background Art

[0002] Polyethylene insulation material is a material made of polyethylene resin as the basic raw material, by adding various additives and undergoing a specific processing technique. It is used to provide insulation protection for electrical equipment or lines. Since polyethylene has excellent electrical insulation properties, chemical stability, processing performance and relatively low cost, the insulation material made from it is widely used in industries such as wires and cables.

[0003] In the prior art, polyethylene insulation material uses polyethylene as a matrix, and the molecular chains inside the polyethylene matrix are relatively dispersed, which makes the overall cohesion of the material limited, affecting the strength performance of the polyethylene insulation material. Based on this, the present invention provides a wear-resistant high-strength silane cross-linked polyethylene insulation material and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a wear-resistant high-strength silane cross-linked polyethylene insulating material and a preparation method thereof. The insulating material prepared by the present invention not only has good wear resistance, but also has excellent strength performance, which effectively improves the performance of the insulating material.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In the first aspect, the present invention provides a wear-resistant and high-strength silane cross-linked polyethylene insulation material, comprising the following raw materials in parts by weight: 60 to 80 parts of polyethylene, 10 to 14 parts of polyvinyl alcohol, 2 to 4 parts of silane coupling agents, 2 to 4 parts of reinforcing materials, 2 to 4 parts of additives, 1 to 3 parts of nucleating agents, 1 to 3 parts of lubricants, 0.6 to 0.8 parts of flame retardants and 0.4 to 0.6 parts of antioxidants.

[0007] Furthermore, the reinforcing material is composed of nano titanium dioxide, aluminum borate whisker, EVA rubber and zirconium dioxide, and the mass ratio of the nano titanium dioxide, aluminum borate whisker, EVA rubber and zirconium dioxide group is 1: (0.6-0.8): (0.6-0.8): (0.2-0.4).

[0008] Furthermore, the reinforcing material is pretreated on nano titanium dioxide before preparation, and the pretreatment method of the nano titanium dioxide is: mixing the nano titanium dioxide with vinyl trimethoxy silane, the mass of the vinyl trimethoxy silane is 2-4% of the mass of the nano titanium dioxide, sending the mixture of nano titanium dioxide and vinyl trimethoxy silane into an oven, setting the oven at 70-80° C. for drying for 2-4 hours, thereby completing the pretreatment of the nano titanium dioxide.

[0009] Furthermore, the reinforcing material is pretreated on the aluminum borate whisker before preparation, and the pretreatment method of the aluminum borate whisker is: the aluminum borate whisker is sent into an ultrasonic disperser, polyethylene glycol is added, the mass of the polyethylene glycol is 1-3% of the mass of the aluminum borate whisker, and the ultrasonic disperser is set at 300-400W for 15-25min to complete the pretreatment of the aluminum borate whisker.

[0010] Furthermore, the reinforcing material pre-treats the EVA rubber before preparation, and the pre-treatment method of the EVA rubber is: crushing and grinding the EVA rubber, the grinding particle size is ≤75μm, and rubber powder is obtained, and the rubber powder is sent to an oven, and the oven is set at 50-60°C for 4-6h to complete the pre-treatment of the EVA rubber.

[0011] Furthermore, the zirconium dioxide has a particle size of ≤100 μm.

[0012] Furthermore, the reinforcing material is prepared by the following method: zirconium dioxide is weighed as needed, and pre-treated nano titanium dioxide, aluminum borate whisker, and EVA rubber are added, and the zirconium dioxide and nano titanium dioxide are fed into a mixer, and the mixer is set to 200-300 r / min for stirring for 6-10 minutes, and then the aluminum borate whisker and EVA rubber are added into the mixer, and the mixer is set to 600-700 r / min for stirring for 10-20 minutes to obtain the reinforcing material.

[0013] Furthermore, the additive is composed of anhydrous ethanol, corn starch and lignin fiber, and the mass ratio of the anhydrous ethanol, corn starch and lignin fiber is 1: (0.2-0.4): (0.1-0.3). The additive is prepared by the following method: adding anhydrous ethanol, corn starch and lignin fiber into a water bath, stirring evenly and heating in a water bath to 80-90° C., keeping the temperature for reaction for 30-40 minutes, cooling to room temperature and stirring evenly to prepare the additive.

[0014] Furthermore, the silane coupling agent is vinyl trimethoxysilane, the nucleating agent is at least one of methyl dibenzylidene sorbitol and ethyl dibenzylidene sorbitol, the lubricant is calcium stearate, the flame retardant is at least one of aluminum hydroxide, magnesium hydroxide, and ammonium polyphosphate, and the antioxidant is phosphite.

[0015] In a second aspect, the present invention also provides a method for preparing a wear-resistant high-strength silane cross-linked polyethylene insulating material, comprising the following steps:

[0016] S1: Weigh polyethylene, polyvinyl alcohol, lubricant, flame retardant and antioxidant as needed and add them into a mixer, set the mixer to 600-800 r / min and mix for 10-20 min, weigh reinforcement material and additives as needed and add them into the mixer during the mixing process, add silane coupling agent and nucleating agent into the mixer, set the mixer to 800-1000 r / min and mix for 10-20 min to obtain a preliminary material;

[0017] S2: The preliminary material is fed into a twin-screw extruder, the twin-screw extruder is set at 100-200 r / min, the temperature is 140-160° C., and the material is extruded and granulated by the twin-screw extruder, and then dehydrated and dried to obtain a wear-resistant and high-strength silane cross-linked polyethylene insulation material.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, reinforcing materials are added during the preparation of polyethylene insulation materials, wherein nano titanium dioxide particles can be evenly dispersed in the polyethylene matrix, playing a good structural support role, improving the wear resistance of the insulation material, aluminum borate whiskers can be combined with nano titanium dioxide to further improve the performance of the polyethylene matrix, and the combined use of EVA rubber and zirconium dioxide can enhance the toughness of the polyethylene matrix, further improving the overall strength of the polyethylene insulation material.

[0020] 2. In the present invention, by adding corn starch and lignin fiber to the additive, the lignin fiber can combine with corn starch to form an interwoven grid structure, which limits the free movement of the polyethylene molecular chains. When the insulating material is stretched, the molecular chains are not easy to move, which improves the compactness of the polyethylene molecular chains and further improves the strength performance of the polyethylene insulating material. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] The present embodiment provides a wear-resistant and high-strength silane cross-linked polyethylene insulating material, comprising the following raw materials in parts by weight: 60 to 80 parts of polyethylene, 10 to 14 parts of polyvinyl alcohol, 2 to 4 parts of silane coupling agents, 2 to 4 parts of reinforcing materials, 2 to 4 parts of additives, 1 to 3 parts of nucleating agents, 1 to 3 parts of lubricants, 0.6 to 0.8 parts of flame retardants and 0.4 to 0.6 parts of antioxidants.

[0023] In some embodiments, the reinforcing material is composed of nano titanium dioxide, aluminum borate whiskers, EVA rubber and zirconium dioxide, and the mass ratio of nano titanium dioxide, aluminum borate whiskers, EVA rubber and zirconium dioxide is 1: (0.6-0.8): (0.6-0.8): (0.2-0.4).

[0024] In some embodiments, the reinforcing material is pretreated on the nano titanium dioxide before preparation, and the pretreatment method of the nano titanium dioxide is: mixing the nano titanium dioxide with vinyl trimethoxy silane, the mass of vinyl trimethoxy silane is 2-4% of the mass of the nano titanium dioxide, sending the mixture of nano titanium dioxide and vinyl trimethoxy silane into an oven, setting the oven at 70-80°C for drying for 2-4 hours, thereby completing the pretreatment of the nano titanium dioxide.

[0025] In some embodiments, the reinforcing material is pretreated on the aluminum borate whiskers before preparation. The pretreatment method of the aluminum borate whiskers is: the aluminum borate whiskers are sent into an ultrasonic disperser, polyethylene glycol is added, the mass of the polyethylene glycol is 1-3% of the mass of the aluminum borate whiskers, the ultrasonic disperser is set at 300-400W for 15-25 minutes, and the pretreatment of the aluminum borate whiskers is completed.

[0026] In some embodiments, the reinforcing material is pretreated on the EVA rubber before preparation. The pretreatment method of the EVA rubber is: crushing and grinding the EVA rubber, and the grinding particle size is ≤75μm to obtain rubber powder, and the rubber powder is sent to an oven, and the oven is set at 50-60℃ for 4-6h to complete the pretreatment of the EVA rubber.

[0027] In some embodiments, the zirconium dioxide has a particle size of ≤100 μm.

[0028] In some embodiments, the reinforcing material is prepared by the following method: zirconium dioxide is weighed as needed, and pre-treated nano titanium dioxide, aluminum borate whiskers, and EVA rubber are added, and the zirconium dioxide and nano titanium dioxide are fed into a mixer, and the mixer is set to 200-300 r / min and stirred for 6-10 minutes, and then the aluminum borate whiskers and EVA rubber are added into the mixer, and the mixer is set to 600-700 r / min and stirred for 10-20 minutes to obtain the reinforcing material.

[0029] In some embodiments, the additive is composed of anhydrous ethanol, corn starch and lignin fiber, and the mass ratio of anhydrous ethanol, corn starch and lignin fiber is 1: (0.2-0.4): (0.1-0.3). The additive is prepared by the following method: anhydrous ethanol, corn starch and lignin fiber are added into a water bath, stirred evenly and heated in a water bath to 80-90°C, kept warm for 30-40 minutes, cooled to room temperature and stirred evenly to prepare the additive.

[0030] In some embodiments, the silane coupling agent is vinyl trimethoxy silane, the nucleating agent is at least one of methyl dibenzylidene sorbitol and ethyl dibenzylidene sorbitol, the lubricant is calcium stearate, the flame retardant is at least one of aluminum hydroxide, magnesium hydroxide, and ammonium polyphosphate, and the antioxidant is phosphite.

[0031] In some embodiments, a method for preparing a wear-resistant high-strength silane cross-linked polyethylene insulation material comprises the following steps:

[0032] S1: Weigh polyethylene, polyvinyl alcohol, lubricant, flame retardant and antioxidant as needed and add them into a mixer, set the mixer to 600-800 r / min and mix for 10-20 min, weigh reinforcement material and additives as needed and add them into the mixer during the mixing process, add silane coupling agent and nucleating agent into the mixer, set the mixer to 800-1000 r / min and mix for 10-20 min to obtain a preliminary material;

[0033] S2: The preliminary material is fed into a twin-screw extruder, the twin-screw extruder is set at 100-200r / min, the temperature is 140-160°C, and the twin-screw extruder is used for extrusion granulation, dehydration and drying to obtain wear-resistant and high-strength silane cross-linked polyethylene insulation material.

[0034] In this embodiment, reinforcing materials are added during the preparation of polyethylene insulation materials, wherein nano titanium dioxide particles can be evenly dispersed in the polyethylene matrix, playing a good structural support role and improving the wear resistance of the insulation material. Aluminum borate whiskers can be combined with nano titanium dioxide to further improve the performance of the polyethylene matrix. The combination of EVA rubber and zirconium dioxide can enhance the toughness of the polyethylene matrix, further improving the overall strength of the polyethylene insulation material. By adding corn starch and lignin fibers to the additives, the lignin fibers can be combined with corn starch to form an interwoven grid structure, which limits the free movement of polyethylene molecular chains. When the insulation material is stretched, the molecular chains are not easy to move, thereby improving the compactness of the polyethylene molecular chains and further improving the strength performance of the polyethylene insulation material.

[0035] Based on the above embodiments, the inventors also conducted the following experiments:

[0036] It should be noted that the raw materials used in the following experiments are all commercially available raw materials.

[0037] Experiment 1:

[0038] Raw material preparation: 60 parts of polyethylene, 10 parts of polyvinyl alcohol, 2 parts of silane coupling agent, 2 parts of reinforcing material, 2 parts of additive, 1 part of nucleating agent, 1 part of lubricant, 0.6 parts of flame retardant and 0.4 parts of antioxidant. The silane coupling agent is vinyl trimethoxy silane, the nucleating agent is methyl dibenzylidene sorbitol, the lubricant is calcium stearate, the flame retardant is aluminum hydroxide, and the antioxidant is phosphite.

[0039] Preparation of reinforcement material: The mass ratio of nano titanium dioxide, aluminum borate whisker, EVA rubber and zirconium dioxide is 1:0.6:0.6:0.2, and the particle size of zirconium dioxide is ≤100 μm;

[0040] Mixing nano titanium dioxide with vinyl trimethoxysilane, wherein the mass of vinyl trimethoxysilane is 2% of the mass of nano titanium dioxide, and sending the mixture of nano titanium dioxide and vinyl trimethoxysilane into an oven, setting the oven at 70° C. for drying for 2 hours, thereby completing the pretreatment of nano titanium dioxide;

[0041] The aluminum borate whiskers were placed in an ultrasonic disperser, polyethylene glycol was added, the mass of the polyethylene glycol was 1% of the mass of the aluminum borate whiskers, and the ultrasonic disperser was set at 300W for 15 minutes to complete the pretreatment of the aluminum borate whiskers;

[0042] The EVA rubber is crushed and ground to a particle size of ≤75 μm to obtain rubber powder, which is then placed in an oven at 50° C. for 4 hours to complete the pretreatment of the EVA rubber;

[0043] Weigh zirconium dioxide and pre-treated nano titanium dioxide, aluminum borate whisker, and EVA rubber as needed, feed zirconium dioxide and nano titanium dioxide into a mixer, set the mixer to 200 r / min and stir for 6 minutes, then add aluminum borate whisker and EVA rubber into the mixer, set the mixer to 600 r / min and stir for 10 minutes to obtain a reinforcement material;

[0044] Preparation of additives: The mass ratio of anhydrous ethanol, corn starch and lignin fiber is 1:0.2:0.1. The additive is prepared by the following method: anhydrous ethanol, corn starch and lignin fiber are added into a water bath, stirred evenly and then heated to 80°C in a water bath, kept warm for 30 minutes, cooled to room temperature and stirred evenly to prepare the additive;

[0045] Preparation of wear-resistant high-strength silane cross-linked polyethylene insulation material: polyethylene, polyvinyl alcohol, lubricant, flame retardant and antioxidant are weighed as needed and added into the mixer, the mixer is set to 600r / min and mixed for 10 minutes, during the mixing process, reinforcing materials and additives are weighed as needed and added into the mixer, silane coupling agent and nucleating agent are added into the mixer, the mixer is set to 800r / min and mixed for 10 minutes to obtain preliminary material, the preliminary material is fed into a twin-screw extruder, the twin-screw extruder is set to 100r / min, the temperature is 140°C, and after extrusion and granulation by the twin-screw extruder, dehydration and drying, wear-resistant high-strength silane cross-linked polyethylene insulation material is obtained.

[0046] Experiment 2:

[0047] Raw material preparation: 70 parts of polyethylene, 12 parts of polyvinyl alcohol, 3 parts of silane coupling agent, 3 parts of reinforcing material, 3 parts of additive, 2 parts of nucleating agent, 2 parts of lubricant, 0.7 parts of flame retardant and 0.5 parts of antioxidant. The silane coupling agent is vinyl trimethoxy silane, the nucleating agent is ethyl dibenzylidene sorbitol, the lubricant is calcium stearate, the flame retardant is magnesium hydroxide, and the antioxidant is phosphite.

[0048] Preparation of reinforcement material: The mass ratio of nano titanium dioxide, aluminum borate whisker, EVA rubber and zirconium dioxide is 1:0.7:0.7:0.3, and the particle size of zirconium dioxide is ≤100 μm;

[0049] Mixing nano titanium dioxide with vinyl trimethoxysilane, wherein the mass of vinyl trimethoxysilane is 3% of the mass of nano titanium dioxide, and sending the mixture of nano titanium dioxide and vinyl trimethoxysilane into an oven, setting the oven at 75° C. for drying for 3 hours, thereby completing the pretreatment of nano titanium dioxide;

[0050] The aluminum borate whiskers were placed in an ultrasonic disperser, polyethylene glycol was added, the mass of the polyethylene glycol was 2% of the mass of the aluminum borate whiskers, and the ultrasonic disperser was set at 350W for 20 minutes to complete the pretreatment of the aluminum borate whiskers;

[0051] The EVA rubber is crushed and ground to a particle size of ≤75 μm to obtain rubber powder, which is then placed in an oven at 55° C. for 5 hours to complete the pretreatment of the EVA rubber;

[0052] Weigh zirconium dioxide and pre-treated nano titanium dioxide, aluminum borate whisker, and EVA rubber as needed, feed zirconium dioxide and nano titanium dioxide into a mixer, set the mixer to 250 r / min and stir for 8 minutes, then add aluminum borate whisker and EVA rubber into the mixer, set the mixer to 650 r / min and stir for 15 minutes to obtain a reinforcement material;

[0053] Preparation of additives: The mass ratio of anhydrous ethanol, corn starch and lignin fiber is 1:0.3:0.2. The additive is prepared by the following method: anhydrous ethanol, corn starch and lignin fiber are added into a water bath, stirred evenly and then heated to 85°C in a water bath, kept warm for 35 minutes, cooled to room temperature and stirred evenly to prepare the additive;

[0054] Preparation of wear-resistant and high-strength silane cross-linked polyethylene insulation material: polyethylene, polyvinyl alcohol, lubricant, flame retardant and antioxidant are weighed as needed and added into the mixer. The mixer is set to 700r / min and mixed for 15 minutes. During the mixing process, reinforcing materials and additives are weighed as needed and added into the mixer. Silane coupling agent and nucleating agent are added to the mixer. The mixer is set to 900r / min and mixed for 15 minutes to obtain preliminary material. The preliminary material is fed into a twin-screw extruder. The twin-screw extruder is set to 150r / min and the temperature is 150°C. After extrusion and granulation by the twin-screw extruder, dehydration and drying are carried out to obtain wear-resistant and high-strength silane cross-linked polyethylene insulation material.

[0055] Experiment 3:

[0056] Raw material preparation: 80 parts of polyethylene, 14 parts of polyvinyl alcohol, 4 parts of silane coupling agent, 4 parts of reinforcing material, 4 parts of additive, 3 parts of nucleating agent, 3 parts of lubricant, 0.8 parts of flame retardant and 0.6 parts of antioxidant. The silane coupling agent is vinyl trimethoxy silane, the nucleating agent is methyl dibenzylidene sorbitol, the lubricant is calcium stearate, the flame retardant is ammonium polyphosphate, and the antioxidant is phosphite.

[0057] Preparation of reinforcing material: The mass ratio of nano titanium dioxide, aluminum borate whisker, EVA rubber and zirconium dioxide is 1:0.8:0.8:0.4, and the particle size of zirconium dioxide is ≤100 μm;

[0058] Mixing nano titanium dioxide with vinyl trimethoxysilane, wherein the mass of the vinyl trimethoxysilane is 4% of the mass of the nano titanium dioxide, and sending the mixture of the nano titanium dioxide and the vinyl trimethoxysilane into an oven, setting the oven to 80° C. for drying for 4 hours, thereby completing the pretreatment of the nano titanium dioxide;

[0059] The aluminum borate whiskers were placed in an ultrasonic disperser, polyethylene glycol was added, the mass of the polyethylene glycol was 3% of the mass of the aluminum borate whiskers, and the ultrasonic disperser was set at 400W for 25 minutes to complete the pretreatment of the aluminum borate whiskers;

[0060] The EVA rubber is crushed and ground to a particle size of ≤75 μm to obtain rubber powder, which is then placed in an oven at 60° C. for 6 hours to complete the pretreatment of the EVA rubber;

[0061] Weigh zirconium dioxide and pre-treated nano titanium dioxide, aluminum borate whisker, and EVA rubber as needed, feed zirconium dioxide and nano titanium dioxide into a mixer, set the mixer to 300 r / min and stir for 10 min, then add aluminum borate whisker and EVA rubber into the mixer, set the mixer to 700 r / min and stir for 20 min to obtain a reinforcement material;

[0062] Preparation of additives: The mass ratio of anhydrous ethanol, corn starch and lignin fiber is 1:0.4:0.3. The additive is prepared by the following method: anhydrous ethanol, corn starch and lignin fiber are added into a water bath, stirred evenly and then heated to 90°C in a water bath, kept warm for 40 minutes, cooled to room temperature and stirred evenly to prepare the additive;

[0063] Preparation of wear-resistant and high-strength silane cross-linked polyethylene insulation material: polyethylene, polyvinyl alcohol, lubricant, flame retardant and antioxidant are weighed as needed and added into the mixer, the mixer is set to 800r / min and mixed for 20 minutes, during the mixing process, reinforcing materials and additives are weighed as needed and added into the mixer, silane coupling agent and nucleating agent are added into the mixer, the mixer is set to 1000r / min and mixed for 20 minutes to obtain preliminary material, the preliminary material is fed into a twin-screw extruder, the twin-screw extruder is set to 200r / min, the temperature is 160°C, and after extrusion and granulation by the twin-screw extruder, dehydration and drying, wear-resistant and high-strength silane cross-linked polyethylene insulation material is obtained.

[0064] Comparative Example 1: The difference between this comparative example and Experiment 1 is that:

[0065] In this comparative example, an equal amount of corn starch was used to replace the reinforcing material.

[0066] Comparative Example 2: The difference between this comparative example and Experiment 1 is that:

[0067] In this comparative example, an equal amount of silicon dioxide was used to replace the additive.

[0068] Comparative Example 3: The difference between this comparative example and Experiment 1 is that:

[0069] This comparative example does not contain any additives.

[0070] Comparative Example 4: The difference between this comparative example and Experiment 1 is that:

[0071] This comparative example does not contain reinforcing material.

[0072] Performance test: The insulation materials prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were tested for performance, and the test data obtained are recorded in the following table:

[0073]

[0074] In the performance test, the insulating materials prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were fixed in a wear resistance testing machine for wear testing. The wear test time was 72 hours, and the wear amount of the insulating material was recorded.

[0075] By comparing and analyzing the relevant data in the table, it can be seen that the insulating material prepared by the present invention not only has good wear resistance, but also has excellent strength performance. This shows that the wear-resistant high-strength silane cross-linked polyethylene insulating material and the preparation method thereof provided by the present invention have a broader market prospect and are more suitable for promotion.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A wear-resistant high-strength silane cross-linked polyethylene insulation material, characterized in that: The invention comprises the following raw materials in parts by weight: 60 to 80 parts of polyethylene, 10 to 14 parts of polyvinyl alcohol, 2 to 4 parts of silane coupling agent, 2 to 4 parts of reinforcing material, 2 to 4 parts of additive, 1 to 3 parts of nucleating agent, 1 to 3 parts of lubricant, 0.6 to 0.8 parts of flame retardant and 0.4 to 0.6 parts of antioxidant.

2. The wear-resistant high-strength silane cross-linked polyethylene insulation material according to claim 1, characterized in that: The reinforcing material is composed of nano titanium dioxide, aluminum borate whisker, EVA rubber and zirconium dioxide, and the mass ratio of the nano titanium dioxide, aluminum borate whisker, EVA rubber and zirconium dioxide is 1: (0.6-0.8): (0.6-0.8): (0.2-0.4).

3. The wear-resistant high-strength silane cross-linked polyethylene insulation material according to claim 1, characterized in that: The reinforcing material is pretreated on the nano titanium dioxide before preparation. The pretreatment method of the nano titanium dioxide is: mixing the nano titanium dioxide with vinyl trimethoxy silane, the mass of the vinyl trimethoxy silane is 2-4% of the mass of the nano titanium dioxide, sending the mixture of the nano titanium dioxide and the vinyl trimethoxy silane into an oven, setting the oven at 70-80° C. for drying for 2-4 hours to complete the pretreatment of the nano titanium dioxide.

4. The wear-resistant high-strength silane cross-linked polyethylene insulation material according to claim 1, characterized in that: The reinforcing material is pretreated on the aluminum borate whisker before preparation. The pretreatment method of the aluminum borate whisker is as follows: the aluminum borate whisker is sent into an ultrasonic disperser, polyethylene glycol is added, the mass of the polyethylene glycol is 1-3% of the mass of the aluminum borate whisker, the ultrasonic disperser is set at 300-400W for 15-25min, and the pretreatment of the aluminum borate whisker is completed.

5. The wear-resistant high-strength silane cross-linked polyethylene insulation material according to claim 1, characterized in that: The reinforcing material is pretreated on the EVA rubber before preparation. The pretreatment method of the EVA rubber is: crushing and grinding the EVA rubber, the grinding particle size is ≤75μm, and rubber powder is obtained. The rubber powder is sent to an oven, and the oven is set at 50-60°C for 4-6h to complete the pretreatment of the EVA rubber.

6. The wear-resistant high-strength silane cross-linked polyethylene insulation material according to claim 1, characterized in that: The zirconium dioxide has a particle size of ≤100 μm.

7. The wear-resistant high-strength silane cross-linked polyethylene insulation material according to claim 1, characterized in that: The reinforcing material is prepared by the following method: zirconium dioxide is weighed as needed, and pre-treated nano titanium dioxide, aluminum borate whisker, and EVA rubber are fed into a mixer, the mixer is set at 200 to 300 r / min for stirring for 6 to 10 minutes, and then the aluminum borate whisker and EVA rubber are added into the mixer, and the mixer is set at 600 to 700 r / min for stirring for 10 to 20 minutes to obtain the reinforcing material.

8. The wear-resistant high-strength silane cross-linked polyethylene insulation material according to claim 1, characterized in that: The additive is composed of anhydrous ethanol, corn starch and lignin fiber, and the mass ratio of the anhydrous ethanol, corn starch and lignin fiber is 1: (0.2-0.4): (0.1-0.3). The additive is prepared by the following method: adding anhydrous ethanol, corn starch and lignin fiber into a water bath, stirring evenly, heating in a water bath to 80-90° C., keeping the temperature for reaction for 30-40 minutes, cooling to room temperature and stirring evenly to prepare the additive.

9. The wear-resistant high-strength silane cross-linked polyethylene insulation material according to claim 1, characterized in that: The silane coupling agent is vinyl trimethoxysilane, the nucleating agent is at least one of methyl dibenzylidene sorbitol and ethyl dibenzylidene sorbitol, the lubricant is calcium stearate, the flame retardant is at least one of aluminum hydroxide, magnesium hydroxide and ammonium polyphosphate, and the antioxidant is phosphite.

10. A method for preparing the wear-resistant high-strength silane cross-linked polyethylene insulation material according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Weigh polyethylene, polyvinyl alcohol, lubricant, flame retardant and antioxidant as needed and add them into a mixer, set the mixer to 600-800 r / min and mix for 10-20 min, weigh reinforcement material and additives as needed and add them into the mixer during the mixing process, add silane coupling agent and nucleating agent into the mixer, set the mixer to 800-1000 r / min and mix for 10-20 min to obtain a preliminary material; S2: The preliminary material is fed into a twin-screw extruder, the twin-screw extruder is set at 100-200 r / min, the temperature is 140-160° C., and the material is extruded and granulated by the twin-screw extruder, and then dehydrated and dried to obtain a wear-resistant and high-strength silane cross-linked polyethylene insulation material.

Images