A high-performance wear-resistant underground cable sheath material and its preparation method

Abstract

This invention relates to the field of cable material technology, specifically to a high-performance wear-resistant underground cable sheath material and its preparation method, comprising the following raw materials in parts by weight: 100 parts polypropylene resin, 10-12 parts filler, 2-4 parts maleic anhydride-grafted polypropylene, 0.1-0.2 parts antioxidant, and 0.2-0.4 parts lubricant. In this invention, waste oyster shells are the core rigid component. After activation, the surface microstructure becomes rough, and after furfural activation modification, the shell powder surface has a flexible structural layer that can deform during friction, absorbing and dispersing frictional energy. Walnut shell powder and cotton linters in the additives, after treatment with hydrochloric acid and sodium hydroxide, react with an aluminate coupling agent to form a lubricating buffer layer at the friction interface. These synergistic effects enable the sheath material to effectively disperse and dissipate shear stress when subjected to continuous friction from gravel and stones in the soil, increasing the wear resistance of the sheath material.

Description

Technical Field

[0001] This invention relates to the field of cable material technology, specifically to a high-performance wear-resistant underground cable sheath material and its preparation method. Background Technology

[0002] Underground cables are an important infrastructure for power transmission, enabling the safe and reliable transmission of electricity from one place to another. They are widely used in urban power grids, industrial areas, and transportation systems, and are also an essential infrastructure for energy transfer in modern society.

[0003] In existing technologies, although polypropylene resin has good heat resistance and mechanical strength, pure polypropylene lacks sufficient abrasion resistance. Therefore, this invention provides a high-performance abrasion-resistant underground cable sheath material and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a high-performance wear-resistant underground cable sheath material and its preparation method. The cable sheath material prepared by this invention not only has good wear resistance but also excellent tensile strength, effectively improving the performance of the cable sheath material.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-performance wear-resistant underground cable sheath material, comprising the following raw materials in parts by weight: 100 parts of polypropylene resin, 10-12 parts of filler, 2-4 parts of maleic anhydride-grafted polypropylene, 0.1-0.2 parts of antioxidant, and 0.2-0.4 parts of lubricant; The raw materials for the filler include powder, additives, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide; The raw materials for the powder include waste oyster shells, sodium carbonate solution, furfural, and toluenesulfonic acid; The raw materials for the additives include auxiliaries, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid, and anhydrous ethanol.

[0006] Further, the filler is prepared by the following method: powder and additives are mixed at a mass ratio of 1:(0.3-0.6), stirred at 100-200 rpm for 20-30 min to obtain a mixture, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide are added, and stirred at 80-90℃ and 200-300 rpm for 15-25 min, cooled and pulverized, and passed through a 300-mesh sieve to obtain the filler.

[0007] Further, the mass ratio of the mixture, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide is 100: (1-2): (0.2-0.4): (0.6-0.8): (0.1-0.2): (0.2-0.4).

[0008] Further, the powder is prepared by the following method: waste oyster shells are soaked in a sodium carbonate solution with a mass concentration of 6-8% at 60-70℃ for 1-2 hours, the oyster shells are removed, washed, dried at 100-110℃ for 2-4 hours, and pulverized through a 300-mesh sieve to obtain shell powder. The shell powder and furfural are mixed at a mass ratio of 1:(0.5-1), and 1-2% of toluenesulfonic acid by mass of the shell powder is added. The mixture is stirred at 80-90℃ for 4-5 hours, filtered, and the first filter residue is taken, washed, and dried to obtain the powder.

[0009] Further, the additive is prepared by the following method: the auxiliary agent and the aluminate coupling agent DL-411 are mixed and stirred at 100-200 rpm for 10-20 min, pentaerythritol stearate, citric acid and anhydrous ethanol are added, and the mixture is stirred at 60-70℃ and 200-300 rpm for 2-3 h to obtain the additive.

[0010] Further, the mass ratio of the additive, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid and anhydrous ethanol is 100:(0.5-1):(0.5-1):(0.2-0.4):(50-80).

[0011] Furthermore, the auxiliary agent is prepared by the following method: Step 1: Take walnut shells, wash them, dry them at 80-90℃ for 12-18 hours, and then crush them through a 300-mesh sieve to obtain walnut shell powder; Step 2: Cut the cotton linters into small pieces, add 5-8 times their weight of hydrochloric acid solution, heat at 80-85℃ for 30-45 minutes, filter to obtain the second filter residue, wash, add 3-4 times their weight of sodium hydroxide solution, heat at 80-85℃ for 30-45 minutes, filter to obtain the third filter residue, wash, add walnut shell powder, stir at 200-300 rpm for 30-40 minutes to obtain the auxiliary agent.

[0012] Furthermore, the hydrochloric acid solution has a mass concentration of 5-8%, the sodium hydroxide solution has a mass concentration of 2-4%, and the mass ratio of the third filter residue to walnut shell powder is (0.3-0.6):1.

[0013] Furthermore, the antioxidant is antioxidant 1010, and the lubricant is calcium stearate.

[0014] Furthermore, the preparation method of the high-performance wear-resistant underground cable sheath material includes the following steps: weighing polypropylene resin, filler, maleic anhydride-grafted polypropylene, antioxidant and lubricant by weight and mixing them, stirring at 500-600 rpm for 5-8 minutes, adding the obtained product to a twin-screw extruder for melt extrusion under the conditions of 170-180℃ in zone 1, 180-190℃ in zone 2, 190-200℃ in zone 3, 200-205℃ in zone 4, 200-205℃ at the die head, and 250-350 rpm of the main extruder, granulating, and obtaining the high-performance wear-resistant underground cable sheath material.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, waste oyster shells are used as the core rigid component. After being soaked and activated in sodium carbonate solution, the surface microstructure becomes rough. After being activated and modified with furfural, the shell powder surface has a flexible structural layer that can deform during friction, absorbing and dispersing frictional energy. Walnut shell powder and cotton linters in the additives react with aluminate coupling agent after being treated with hydrochloric acid and sodium hydroxide, forming a lubricating buffer layer at the friction interface. The above synergistic effect enables the sheath material to effectively disperse and dissipate shear stress when subjected to continuous friction from gravel and stones in the soil, increasing the wear resistance of the sheath material.

[0016] 2. In this invention, the walnut shell fibers and oyster shell rigid particles in the additives interweave with each other, which improves the stress transmission efficiency and crack propagation resistance. When subjected to tensile external force, the particles bear the main load, thereby improving the tensile properties of the sheath material. Attached Figure Description

[0017] Figure 1 The present invention provides a flowchart of a high-performance wear-resistant underground cable sheath material 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 for high-performance wear-resistant underground cable sheath material: 100 parts polypropylene resin, 10 parts filler, 2 parts maleic anhydride grafted polypropylene, 0.1 parts antioxidant and 0.2 parts lubricant; Filler raw material preparation: powder, additives, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide; Raw material preparation for powder: waste oyster shells, sodium carbonate solution, furfural and toluenesulfonic acid; Raw material preparation for additives: auxiliaries, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid and anhydrous ethanol.

[0021] Preparation of filler: Mix powder and additives at a mass ratio of 1:0.3 and stir at 100 rpm for 20 min to obtain a mixture. Mix the mixture, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide at a mass ratio of 100:1:0.2:0.6:0.1:0.2 and stir at 80℃ and 200 rpm for 15 min. After cooling, pulverize and pass through a 300-mesh sieve to obtain the filler.

[0022] Preparation of powder: Waste oyster shells were placed in sodium carbonate solution and soaked at 60°C for 1 hour. The oyster shells were removed, washed, dried at 100°C for 2 hours, and pulverized through a 300-mesh sieve to obtain shell powder. Furfural and toluenesulfonic acid were added, and the mixture was stirred at 80°C for 4 hours. The mixture was filtered, and the first filter residue was taken, washed, and dried to obtain powder. The mass concentration of sodium carbonate solution was 6%, the mass ratio of shell powder to furfural was 1:0.5, and the mass of toluenesulfonic acid was 1% of the mass of shell powder.

[0023] Preparation of additive: Mix the auxiliary agent and aluminate coupling agent DL-411, stir at 100 rpm for 10 min, add pentaerythritol stearate, citric acid and anhydrous ethanol, stir at 60℃ and 200 rpm for 2 h to obtain the additive. The mass ratio of auxiliary agent, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid and anhydrous ethanol is 100:0.5:0.5:0.2:50.

[0024] Preparation of additives: Step 1: Wash the walnut shells, dry them at 80℃ for 12 hours, and then pulverize them through a 300-mesh sieve to obtain walnut shell powder; Step 2: Mix the shredded cotton linters with hydrochloric acid solution, heat at 80℃ for 30 minutes, filter to obtain the second filter residue, wash, add sodium hydroxide solution with a mass of 3 times that of the second filter residue, heat at 80℃ for 30 minutes, filter to obtain the third filter residue, wash, add walnut shell powder, stir at 200 rpm for 30 minutes to obtain the auxiliary agent. The mass of hydrochloric acid solution is 5 times that of cotton linters, the mass concentration of hydrochloric acid solution is 5%, the mass concentration of sodium hydroxide solution is 2%, and the mass ratio of the third filter residue to walnut shell powder is 0.3:1.

[0025] The antioxidant is antioxidant 1010, and the lubricant is calcium stearate.

[0026] Preparation of high-performance wear-resistant underground cable sheath material: Polypropylene resin, filler, maleic anhydride-grafted polypropylene, antioxidant and lubricant were weighed and mixed according to the weight parts. The mixture was stirred at 500 rpm for 5 min. Under the conditions of 170℃ in zone 1, 180℃ in zone 2, 190℃ in zone 3, 200℃ in zone 4, 200℃ at the die head, and 250 rpm at the main extruder, the resulting product was added to a twin-screw extruder for melt extrusion and granulation to obtain high-performance wear-resistant underground cable sheath material.

[0027] Example 2: Raw material preparation for high-performance wear-resistant underground cable sheath material: 100 parts polypropylene resin, 11 parts filler, 3 parts maleic anhydride grafted polypropylene, 0.15 parts antioxidant and 0.3 parts lubricant; Filler raw material preparation: powder, additives, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide; Raw material preparation for powder: waste oyster shells, sodium carbonate solution, furfural and toluenesulfonic acid; Raw material preparation for additives: auxiliaries, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid and anhydrous ethanol.

[0028] Preparation of filler: Powder and additives were mixed at a mass ratio of 1:0.45 and stirred at 150 rpm for 25 min to obtain a mixture. The mixture, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic amide were mixed at a mass ratio of 100:1.5:0.3:0.7:0.15:0.3 and stirred at 85℃ and 250 rpm for 20 min. After cooling, the filler was pulverized and passed through a 300-mesh sieve to obtain the filler.

[0029] Preparation of powder: Waste oyster shells were placed in sodium carbonate solution and soaked at 65℃ for 1.5h. The oyster shells were removed, washed, dried at 105℃ for 3h, and pulverized through a 300-mesh sieve to obtain shell powder. Furfural and toluenesulfonic acid were added, and the mixture was stirred at 85℃ for 4.5h. The mixture was filtered, and the first filter residue was taken, washed, and dried to obtain powder. The mass concentration of sodium carbonate solution was 7%, the mass ratio of shell powder to furfural was 1:0.75, and the mass of toluenesulfonic acid was 1.5% of the mass of shell powder.

[0030] Preparation of additive: Mix the auxiliary agent and aluminate coupling agent DL-411, stir at 150 rpm for 15 min, add pentaerythritol stearate, citric acid and anhydrous ethanol, stir at 65℃ and 250 rpm for 2.5 h to obtain the additive. The mass ratio of auxiliary agent, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid and anhydrous ethanol is 100:0.75:0.75:0.3:65.

[0031] Preparation of additives: Step 1: Wash the walnut shells, dry them at 85℃ for 15 hours, and then pulverize them through a 300-mesh sieve to obtain walnut shell powder. Step 2: Mix the shredded cotton linters with hydrochloric acid solution, heat at 82℃ for 37 minutes, filter to obtain the second filter residue, wash, add sodium hydroxide solution with a mass of 3.5 times that of the second filter residue, heat at 82℃ for 37 minutes, filter to obtain the third filter residue, wash, add walnut shell powder, stir at 250 rpm for 35 minutes to obtain the auxiliary agent. The mass of hydrochloric acid solution is 6.5 times that of cotton linters, the mass concentration of hydrochloric acid solution is 6.5%, the mass concentration of sodium hydroxide solution is 3%, and the mass ratio of the third filter residue to walnut shell powder is 0.45:1.

[0032] The antioxidant is antioxidant 1010, and the lubricant is calcium stearate.

[0033] Preparation of high-performance wear-resistant underground cable sheath material: Polypropylene resin, filler, maleic anhydride-grafted polypropylene, antioxidant and lubricant were weighed and mixed according to the weight parts. The mixture was stirred at 550 rpm for 6 min. Under the conditions of 175℃ in zone 1, 185℃ in zone 2, 195℃ in zone 3, 202℃ in zone 4, 202℃ at the die head, and 300 rpm of the main extruder, the resulting product was added to a twin-screw extruder for melt extrusion and granulation to obtain high-performance wear-resistant underground cable sheath material.

[0034] Example 3: Raw material preparation for high-performance wear-resistant underground cable sheath material: 100 parts polypropylene resin, 12 parts filler, 4 parts maleic anhydride grafted polypropylene, 0.2 parts antioxidant and 0.4 parts lubricant; Filler raw material preparation: powder, additives, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide; Raw material preparation for powder: waste oyster shells, sodium carbonate solution, furfural and toluenesulfonic acid; Raw material preparation for additives: auxiliaries, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid and anhydrous ethanol.

[0035] Preparation of filler: Mix powder and additives at a mass ratio of 1:0.6 and stir at 200 rpm for 30 min to obtain a mixture. Mix the mixture, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide at a mass ratio of 100:2:0.4:0.8:0.2:0.4 and stir at 90℃ and 300 rpm for 25 min. After cooling, pulverize and pass through a 300-mesh sieve to obtain the filler.

[0036] Preparation of powder: Waste oyster shells were placed in sodium carbonate solution and soaked at 70℃ for 2 hours. The oyster shells were removed, washed, dried at 110℃ for 4 hours, and pulverized through a 300-mesh sieve to obtain shell powder. Furfural and toluenesulfonic acid were added, and the mixture was stirred at 90℃ for 5 hours. The mixture was filtered, and the first filter residue was taken, washed, and dried to obtain powder. The mass concentration of sodium carbonate solution was 8%, the mass ratio of shell powder to furfural was 1:1, and the mass of toluenesulfonic acid was 2% of the mass of shell powder.

[0037] Preparation of additive: Mix the auxiliary agent and aluminate coupling agent DL-411, stir at 200 rpm for 20 min, add pentaerythritol stearate, citric acid and anhydrous ethanol, stir at 70℃ and 300 rpm for 3 h to obtain the additive. The mass ratio of auxiliary agent, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid and anhydrous ethanol is 100:1:1:0.4:80.

[0038] Preparation of additives: Step 1: Wash the walnut shells, dry them at 90℃ for 18 hours, and then pulverize them through a 300-mesh sieve to obtain walnut shell powder; Step 2: Mix the shredded cotton linters with hydrochloric acid solution, heat at 85℃ for 45 minutes, filter to obtain the second filter residue, wash, add sodium hydroxide solution with a mass of 4 times that of the second filter residue, heat at 85℃ for 45 minutes, filter to obtain the third filter residue, wash, add walnut shell powder, stir at 300 rpm for 40 minutes to obtain the auxiliary agent. The mass of hydrochloric acid solution is 8 times that of cotton linters, the mass concentration of hydrochloric acid solution is 8%, the mass concentration of sodium hydroxide solution is 4%, and the mass ratio of the third filter residue to walnut shell powder is 0.6:1.

[0039] The antioxidant is antioxidant 1010, and the lubricant is calcium stearate.

[0040] Preparation of high-performance wear-resistant underground cable sheath material: Polypropylene resin, filler, maleic anhydride-grafted polypropylene, antioxidant and lubricant were weighed and mixed according to the weight parts. The mixture was stirred at 600 rpm for 8 min. Under the conditions of 180℃ in zone 1, 190℃ in zone 2, 200℃ in zone 3, 205℃ in zone 4, 205℃ at the die head, and 350 rpm of the main extruder, the resulting product was added to a twin-screw extruder for melt extrusion and granulation to obtain high-performance wear-resistant underground cable sheath material.

[0041] Comparative Example 1: The difference between this comparative example and Example 1 is that this comparative example does not contain fillers.

[0042] Comparative Example 2 differs from Example 1 in that it does not contain any additives.

[0043] Comparative Example 3 differs from Example 1 in that it does not contain powder.

[0044] Performance testing: Performance tests were conducted on the cable sheath materials treated in Examples 1-3 and Comparative Examples 1-3, and the test data are recorded in the table below: Table 1 In the performance test, the mass wear was tested according to the mass wear test method 9.2 in GB / T3960-2016. The smaller the value, the better the wear resistance. The tensile strength was tested according to the tensile strength test method 3.6.2 in GB / T1040.1-2022. The larger the value, the better the tensile strength.

[0045] Among them, the wear resistance and tensile strength of the sheath material treated in Comparative Examples 1-3 were lower than those in Examples 1-3, which illustrates the importance of fillers. After the waste oyster shells were activated and modified with sodium carbonate solution and furfural, the shell powder surface had a flexible structural layer. This structure improved the interfacial compatibility between the shell powder and the polypropylene matrix, allowing rigid particles to be evenly dispersed without agglomeration. On the other hand, it could deform during friction, absorbing and dispersing frictional energy. Therefore, the wear resistance of Comparative Example 3, which lacked powder, decreased. The walnut shell powder and cotton linters in the additives, after being treated with hydrochloric acid and sodium hydroxide, reacted with an aluminate coupling agent to form a coating layer with a hydrophobic structure, making the particles less likely to fall off. At the same time, epoxidized soybean oil can reduce the internal friction coefficient of the matrix during friction. During processing and friction, oleamide migrates to the material surface, forming a low surface energy molecular film, which further reduces the coefficient of friction. Therefore, the wear resistance of Comparative Example 2, which lacks additives, is reduced, and the wear resistance of Comparative Example 1, which lacks the entire filler, is significantly reduced. After being modified with furfural, waste oyster shell powder reacts with a silane coupling agent, resulting in the coating of the particle surface. When these coated particles are mixed with the polypropylene matrix, they undergo physical entanglement and chemical bonding, anchoring the rigid particles in the matrix. After acid and alkali treatment, the walnut shell powder and cotton linter cellulose in the additives have increased aspect ratios and enhanced surface activity. During stirring, they interpenetrate with the shell powder particles, forming a structure similar to fiber-reinforced composite materials. Therefore, the tensile properties of Comparative Examples 1, 2, and 3 are all reduced.

[0046] By comparing and analyzing the relevant data in the table, it can be seen that the high-performance wear-resistant buried cable sheath material of the present invention not only has good wear resistance but also excellent tensile strength. This indicates that the high-performance wear-resistant buried cable sheath material provided by the present invention has a broader market prospect and is more suitable for widespread application.

[0047] 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.

[0048] 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 high-performance, wear-resistant sheathing material for underground cables, characterized in that, The raw materials include the following parts by weight: 100 parts polypropylene resin, 10-12 parts filler, 2-4 parts maleic anhydride grafted polypropylene, 0.1-0.2 parts antioxidant and 0.2-0.4 parts lubricant; The raw materials for the filler include powder, additives, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide; The raw materials for the powder include waste oyster shells, sodium carbonate solution, furfural, and toluenesulfonic acid; The raw materials for the additives include auxiliaries, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid, and anhydrous ethanol.

2. The high-performance wear-resistant buried cable sheath material according to claim 1, characterized in that, The filler is prepared by the following method: powder and additives are mixed at a mass ratio of 1:(0.3-0.6), stirred at 100-200 rpm for 20-30 min to obtain a mixture, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic acid amide are added, and stirred at 80-90℃ and 200-300 rpm for 15-25 min, cooled and pulverized, and passed through a 300-mesh sieve to obtain the filler.

3. The high-performance wear-resistant buried cable sheath material according to claim 2, characterized in that, The mass ratio of the mixture, silane coupling agent KH550, epoxidized soybean oil, stearic acid, nano titanium dioxide and oleic amide is 100: (1-2): (0.2-0.4): (0.6-0.8): (0.1-0.2): (0.2-0.4).

4. The high-performance wear-resistant buried cable sheath material according to claim 1, characterized in that, The powder is prepared by the following method: waste oyster shells are soaked in a sodium carbonate solution with a mass concentration of 6-8% at 60-70℃ for 1-2 hours, the oyster shells are removed, washed, dried at 100-110℃ for 2-4 hours, and pulverized through a 300-mesh sieve to obtain shell powder. The shell powder and furfural are mixed at a mass ratio of 1:(0.5-1), and 1-2% of toluenesulfonic acid by mass of the shell powder is added. The mixture is stirred at 80-90℃ for 4-5 hours, filtered, and the first filter residue is taken, washed, and dried to obtain the powder.

5. The high-performance wear-resistant buried cable sheath material according to claim 1, characterized in that, The additive is prepared by the following method: the auxiliary agent and aluminate coupling agent DL-411 are mixed and stirred at 100-200 rpm for 10-20 min, pentaerythritol stearate, citric acid and anhydrous ethanol are added, and the mixture is stirred at 60-70℃ and 200-300 rpm for 2-3 h to obtain the additive.

6. The high-performance wear-resistant buried cable sheath material according to claim 5, characterized in that, The mass ratio of the additive, aluminate coupling agent DL-411, pentaerythritol stearate, citric acid and anhydrous ethanol is 100:(0.5-1):(0.5-1):(0.2-0.4):(50-80).

7. The high-performance wear-resistant buried cable sheath material according to claim 1, characterized in that, The auxiliary agent is prepared by the following method: Step 1: Take walnut shells, wash them, dry them at 80-90℃ for 12-18 hours, and then crush them through a 300-mesh sieve to obtain walnut shell powder; Step 2: Cut the cotton linters into small pieces, add 5-8 times their weight of hydrochloric acid solution, heat at 80-85℃ for 30-45 minutes, filter to obtain the second filter residue, wash, add 3-4 times their weight of sodium hydroxide solution, heat at 80-85℃ for 30-45 minutes, filter to obtain the third filter residue, wash, add walnut shell powder, stir at 200-300 rpm for 30-40 minutes to obtain the auxiliary agent.

8. The high-performance wear-resistant buried cable sheath material according to claim 7, characterized in that, The hydrochloric acid solution has a mass concentration of 5-8%, the sodium hydroxide solution has a mass concentration of 2-4%, and the mass ratio of the third filter residue to walnut shell powder is (0.3-0.6):

1.

9. The high-performance wear-resistant buried cable sheath material according to claim 1, characterized in that, The antioxidant is antioxidant 1010, and the lubricant is calcium stearate.

10. The method for preparing the high-performance wear-resistant buried cable sheath material according to any one of claims 1-9, characterized in that, Includes the following steps: Weigh out polypropylene resin, filler, maleic anhydride-grafted polypropylene, antioxidant, and lubricant by weight and mix them. Stir at 500-600 rpm for 5-8 minutes. Under the conditions of 170-180℃ in zone 1, 180-190℃ in zone 2, 190-200℃ in zone 3, 200-205℃ in zone 4, 200-205℃ at the die head, and 250-350 rpm for the main extruder, add the resulting product into a twin-screw extruder for melt extrusion and granulation to obtain a high-performance wear-resistant underground cable sheath material.

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