Wear-resistant polyethylene composite material and method for producing same

Abstract

This invention relates to the field of polyethylene technology, specifically to a wear-resistant polyethylene composite material and its preparation method. The invention uses linear low-density polyethylene (LLDPE) as a base material, and improves the interfacial bonding between LLDPE, polypropylene carbonate, and 2-amino-4-hydroxy-6-methylpyrimidine by reinforcing the LLDPE, polypropylene carbonate, and 2-amino-4-hydroxy-6-methylpyrimidine. Polypropylene carbonate dissipates impact energy through chain segment movement, induced shear yielding, and interfacial microcavitation, while 2-amino-4-hydroxy-6-methylpyrimidine enhances the material's resistance to crack propagation through hydrogen bonding, thereby giving the resulting material excellent toughness. Furthermore, the invention also modifies carbon black with 1,6-hexanediamine, isophthalohydrazide, and N-cyclohexyl-2-benzothiazole sulfenamide, which is then added to the system as filler, effectively improving the wear resistance of the composite material.

Description

Technical Field

[0001] This invention relates to the field of polyethylene technology, and more specifically to a wear-resistant polyethylene composite material and its preparation method. Background Technology

[0002] Polyethylene (PE) is a widely used general-purpose plastic characterized by good chemical stability, excellent processing performance, good electrical insulation, and low price. It is widely used in automotive parts, machine parts, wear-resistant tools, and packaging materials. However, pure polyethylene itself has shortcomings in wear resistance and impact toughness, which prevents it from meeting the application requirements of some scenarios with high mechanical and wear resistance demands, thus limiting its further promotion and use. To improve the toughness and wear resistance of polyethylene, the industry currently widely employs modification methods such as blending with inorganic fillers, glass fibers, and carbon fibers to enhance its wear resistance and mechanical properties. Adding rigid fillers improves the surface hardness and wear resistance, while fiber reinforcement optimizes the overall strength of the material. However, existing modification technologies generally suffer from a core flaw of performance trade-offs. Most fillers exhibit poor interfacial compatibility with the polyethylene matrix, leading to uneven agglomeration and dispersion within the matrix. This not only fails to uniformly transfer loads and improve wear resistance but also creates stress concentration defects within the material, significantly reducing the composite's impact toughness and crack resistance. This results in a technical bottleneck where improved wear resistance leads to decreased toughness, and optimized toughness results in insufficient wear resistance, making it difficult to simultaneously achieve a synergistic improvement in both toughness and wear resistance. Therefore, to address this issue, there is still a need to develop a polyethylene composite material that possesses both excellent toughness and wear resistance. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a wear-resistant polyethylene composite material and its preparation method.

[0004] The objective of this invention can be achieved through the following technical solutions: A wear-resistant polyethylene composite material, comprising, by weight, the following parts of raw materials: The composition includes 74-80 parts linear low-density polyethylene, 12.4-16.5 parts toughening component, 5-6.2 parts polyethylene-maleic anhydride copolymer, 8-12 parts modified carbon black, 0.2-0.3 parts dicumyl peroxide, 0.2-0.3 parts epoxidized soybean oil, 0.4-0.6 parts antioxidant 1010, 0.3-0.5 parts antioxidant 168, and 0.4-0.6 parts zinc stearate.

[0005] As a preferred embodiment of the present invention, the toughening component comprises 8-10.5 parts by weight of polypropylene carbonate, 1.6-2 parts by weight of 2-amino-4-hydroxy-6-methylpyrimidine, and 2.8-4 parts by weight of glycidyl methacrylate. This invention uses linear low-density polyethylene as a base material and enhances the interfacial bonding between linear low-density polyethylene, polypropylene carbonate, and 2-amino-4-hydroxy-6-methylpyrimidine by glycidyl methacrylate, thereby improving the compatibility of the multiphase system. At the same time, polypropylene carbonate dissipates impact energy through chain segment movement, induced shear yielding, and interfacial microcavitation. Meanwhile, 2-amino-4-hydroxy-6-methylpyrimidine improves the material's resistance to crack propagation through hydrogen bonding, thus giving the prepared material excellent toughness.

[0006] As a preferred embodiment of the present invention, the method for preparing the modified carbon black specifically includes the following steps: Carbon black, anhydrous ethanol, and N,N-dimethylformamide were mixed and ultrasonically dispersed. 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and N-hydroxysuccinimide were added and stirred under controlled temperature for the first time. 1,6-hexanediamine was added and stirred under controlled temperature for the second time. Then isophthalohydrazide and N-cyclohexyl-2-benzothiazole sulfenamide were added and stirred under controlled temperature and speed. The mixture was filtered while hot, washed, and dried to constant weight to obtain modified carbon black. The modified carbon black prepared in this invention enhances the interface between the filler and the matrix through 1,6-hexanediamine, isophthalohydrazide, and N-cyclohexyl-2-benzothiazole sulfenamide, forming a stable and wear-resistant support structure, thereby reducing surface damage during friction and improving the wear resistance of the composite material.

[0007] Further, the carbon black is 16-20 parts by weight, anhydrous ethanol is 140-180 parts by weight, N,N-dimethylformamide is 16-20 parts by weight, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide is 0.4-0.9 parts by weight, N-hydroxysuccinimide is 0.3-0.8 parts by weight, 1,6-hexanediamine is 1-1.4 parts by weight, isophthalohydrazide is 0.7-1 parts by weight, and N-cyclohexyl-2-benzothiazole sulfenamide is 0.4-0.6 parts by weight.

[0008] Furthermore, the carbon black includes carbon black N220 or carbon black N330.

[0009] Preferably, the carbon black comprises carbon black N330.

[0010] Further, the carbon black is dried at a temperature of 100-105℃ for 3.5-4 hours; the ultrasonic dispersion is performed at a power of 300-400W for 30-40 minutes; the first temperature-controlled stirring is performed at a temperature of 40-45℃ for 30-40 minutes; the second temperature-controlled stirring is performed at a temperature of 50-55℃ for 1.5-2 hours; the temperature and speed controlled stirring is performed at a temperature of 55-60℃ and a speed of 300-330 r / min for 3-4 hours; the filter cake is washed 2-3 times with anhydrous ethanol; and the drying to constant weight is performed at a temperature of 80-100℃.

[0011] A method for preparing a wear-resistant polyethylene composite material specifically includes the following steps: Linear low-density polyethylene, polypropylene carbonate, polyethylene-maleic anhydride copolymer, 2-amino-4-hydroxy-6-methylpyrimidine, glycidyl methacrylate, epoxidized soybean oil, antioxidant 1010, antioxidant 168 and zinc stearate were mixed and then modified carbon black was added and mixed further to obtain a premix. The premixed material is mixed under controlled temperature, then cooled and mixed with dicumyl peroxide for further mixing. After mixing, it is placed in a twin-screw extruder for extrusion, cooling, granulation and drying to obtain the polyethylene composite material.

[0012] As a preferred embodiment of the present invention, the linear low-density polyethylene comprises 74-80 parts by weight, polypropylene carbonate comprises 8-10.5 parts by weight, polyethylene-maleic anhydride copolymer comprises 5-6.2 parts by weight, 2-amino-4-hydroxy-6-methylpyrimidine comprises 1.6-2 parts by weight, glycidyl methacrylate comprises 2.8-4 parts by weight, epoxidized soybean oil comprises 0.2-0.3 parts by weight, antioxidant 1010 comprises 0.4-0.6 parts by weight, antioxidant 168 comprises 0.3-0.5 parts by weight, zinc stearate comprises 0.4-0.6 parts by weight, modified carbon black comprises 8-12 parts by weight, and dicumyl peroxide comprises 0.2-0.3 parts by weight.

[0013] As a preferred embodiment of the present invention, the polypropylene carbonate is vacuum dried at a temperature of 75-80°C for 5-6 hours; the mixing speed is 300-320 r / min for 3-5 minutes; and the continued mixing speed is 700-800 r / min for 2-3 minutes.

[0014] As a preferred embodiment of the present invention, the temperature of the temperature-controlled internal mixing is 155-160℃, and the time is 4-5 min; the temperature of the cooling is 110-120℃; the time of the continued internal mixing is 1-1.5 min; the parameters of each zone of the twin-screw extruder are: zone 1: 130-135℃, zone 2: 135-140℃, zone 3: 135-140℃, zone 4: 135-140℃, zone 5: 130-135℃, die head temperature: 135-140℃, and speed: 120-150 rpm.

[0015] The beneficial effects of this invention are: (1) In this invention, glycidyl methacrylate is used as a molecular bridge to connect the nonpolar linear low-density polyethylene matrix with the polar polypropylene carbonate and the polar 2-amino-4-hydroxy-6-methylpyrimidine toughening component, which greatly improves the interfacial bonding force between the two phases and improves the poor compatibility and easy phase separation of the polar-nonpolar system. The amino, hydroxyl and nitrogen atoms on the pyrimidine ring in the 2-amino-4-hydroxy-6-methylpyrimidine structure can form a dynamic hydrogen bond network inside the matrix. When the material is subjected to external impact, the local stress load is evenly distributed to the entire material system, avoiding the local stress overload caused by the Brittle fracture improves the impact toughness of the material; while polypropylene carbonate has high polarity and good chain segment mobility, and can act as an energy-absorbing phase. When subjected to impact, it absorbs impact energy through chain segment movement, interfacial cavitation and shear yielding. At the same time, with the compatibilizing effect of glycidyl methacrylate and polyethylene-maleic anhydride copolymer, polypropylene carbonate can be uniformly dispersed in the linear low-density polyethylene matrix. When the material is subjected to external force or cyclic friction load, it can induce local shear yielding and interfacial cavitation, absorb external energy, and cause crack path deflection and extension, thereby improving the toughness of the entire system.

[0016] (2) The carbon black surface itself contains carboxyl and hydroxyl active groups. The amino group of 1,6-hexanediamine can interact with the carbon black surface groups and enhance the interfacial bonding strength between the filler and the matrix, making it difficult for the carbon black to fall off from the matrix during friction and wear. On this basis, the dihydrazide group of isophthalic hydrazide can generate hydrogen bonding or interfacial interaction with the oxygen-containing functional groups on the carbon black surface. At the same time, its aromatic structure improves the interfacial rigidity, while the polar hydrazide group in its molecule can form complementary hydrogen bonds with the polar groups in the matrix, forming a stable interfacial bonding layer on the carbon black surface and improving the interfacial shear resistance. In addition, the present invention also uses N-cyclohexyl-2-benzothiazole sulfenamide to reduce the surface energy of carbon black and improve its dispersibility in the matrix, thereby reducing the friction coefficient and reducing the energy input of wear. Therefore, the polyethylene composite material prepared in this way has significant wear resistance. Detailed Implementation

[0017] The technical solution of the present invention is illustrated below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or defining the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0018] To better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0019] The linear low-density polyethylene used in this invention, grade DFDA-7042, was purchased from CNOOC Shell Petrochemicals Co., Ltd. The carbon black N330 used was purchased from: China Carbon (Shandong) Chemical Co., Ltd.; The polyethylene-maleic anhydride copolymer used was purchased from Nanjing Genasis New Materials Co., Ltd.

[0020] The present invention will be further described below with reference to the following embodiments.

[0021] Example 1

[0022] In this embodiment, polyethylene composite material is prepared according to the following method: Carbon black N330 was dried at 105℃ for 3.5 hours. 20g of the dried carbon black, 140g of anhydrous ethanol, and 16g of N,N-dimethylformamide were mixed and ultrasonically dispersed at 400W for 30 minutes. 0.9g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and 0.3g of N-hydroxysuccinimide were added and stirred at 40℃ for 40 minutes. 1.4g of 1,6-hexanediamine was added and stirred at 55℃ for 1.5 hours. 0.7g of isophthalohydrazide and 0.6g of N-cyclohexyl-2-benzothiazole sulfenamide were added and stirred at 60℃ and 300r / min for 4 hours. The mixture was filtered while hot, and the filter cake was washed twice with anhydrous ethanol. It was then vacuum dried at 80℃ to constant weight to obtain modified carbon black. Polypropylene carbonate was vacuum dried at 80℃ for 5 hours and set aside. 80g of linear low-density polyethylene, 10.5g of vacuum-dried polypropylene carbonate, 6.2g of polyethylene-maleic anhydride copolymer, 2g of 2-amino-4-hydroxy-6-methylpyrimidine, 2.8g of glycidyl methacrylate, 0.3g of epoxidized soybean oil, 0.4g of antioxidant 1010, 0.5g of antioxidant 168, and 0.6g of zinc stearate were mixed at 300r / min for 3 minutes. Then, 8g of modified carbon black was added, and the mixing speed was increased to 700r / min. The mixture was then continued for 2 minutes to obtain the premix. The premixed material was internally mixed at 155℃ for 4 minutes, cooled to 110℃, and then 0.2g of dicumyl peroxide was added and the mixture was continued to be internally mixed for 1 minute. After the internal mixing was completed, the mixture was placed in a twin-screw extruder with zone 1: 130℃, zone 2: 135℃, zone 3: 135℃, zone 4: 135℃, zone 5: 130℃, die head temperature 130℃, and speed 120rpm. The mixture was then extruded, cooled, granulated, and dried to obtain the polyethylene composite material.

[0023] Example 2

[0024] In this embodiment, polyethylene composite material is prepared according to the following method: Carbon black N330 was dried at 102.5℃ for 4 hours. 18g of the dried carbon black, 180g of anhydrous ethanol, and 19g of N,N-dimethylformamide were mixed and ultrasonically dispersed at 300W for 40 minutes. 0.65g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and 0.8g of N-hydroxysuccinimide were added and stirred at 45℃ for 30 minutes. 1g of 1,6-hexanediamine was added and stirred at 50℃ for 2 hours. 1g of isophthalohydrazide and 0.5g of N-cyclohexyl-2-benzothiazole sulfenamide were added and stirred at 55℃ and 330r / min for 3 hours. The mixture was filtered while hot, and the filter cake was washed three times with anhydrous ethanol. It was then vacuum dried at 100℃ to constant weight to obtain modified carbon black. Polypropylene carbonate was vacuum dried at 75℃ for 6 hours and set aside. 74g of linear low-density polyethylene, 8g of vacuum-dried polypropylene carbonate, 5g of polyethylene-maleic anhydride copolymer, 1.6g of 2-amino-4-hydroxy-6-methylpyrimidine, 4g of glycidyl methacrylate, 0.2g of epoxidized soybean oil, 0.6g of antioxidant 1010, 0.3g of antioxidant 168 and 0.4g of zinc stearate were mixed at a controlled speed of 320r / min for 5 minutes. Then, 12g of modified carbon black was added and the speed was increased to 800r / min and the mixture was mixed for another 3 minutes to obtain the premix. The premixed material was internally mixed at 160℃ for 5 minutes, cooled to 120℃, and then 0.3g of dicumyl peroxide was added and the mixture was continued to be internally mixed for 2 minutes. After the internal mixing was completed, the mixture was placed in a twin-screw extruder with zone 1: 135℃, zone 2: 140℃, zone 3: 140℃, zone 4: 140℃, zone 5: 135℃, die head temperature 135℃, and speed 150rpm. After extrusion, cooling, granulation, and drying, the polyethylene composite material was obtained.

[0025] Example 3

[0026] In this embodiment, polyethylene composite material is prepared according to the following method: Carbon black N330 was dried at 100℃ for 3.5 h. 16 g of the dried carbon black, 160 g of anhydrous ethanol, and 20 g of N,N-dimethylformamide were mixed and ultrasonically dispersed at 350 W for 35 min. 0.4 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and 0.55 g of N-hydroxysuccinimide were added and stirred at 43℃ for 35 min. 1.2 g of 1,6-hexanediamine was added and stirred at 52℃ for 1.75 h. 0.85 g of isophthalohydrazide and 0.4 g of N-cyclohexyl-2-benzothiazole sulfenamide were added and stirred at 57.5℃ and 315 r / min for 3.5 h. The mixture was filtered while hot, and the filter cake was washed three times with anhydrous ethanol. It was then vacuum dried at 90℃ to constant weight to obtain modified carbon black. Polypropylene carbonate was vacuum dried at 77℃ for 5.5 hours and set aside. 77g of linear low-density polyethylene, 9.3g of vacuum-dried polypropylene carbonate, 5.6g of polyethylene-maleic anhydride copolymer, 1.8g of 2-amino-4-hydroxy-6-methylpyrimidine, 3.4g of glycidyl methacrylate, 0.25g of epoxidized soybean oil, 0.5g of antioxidant 1010, 0.4g of antioxidant 168 and 0.5g of zinc stearate were mixed at a speed of 310r / min for 4 minutes. Then 10g of modified carbon black was added and the speed was increased to 750r / min and the mixture was mixed for another 2.5 minutes to obtain the premix. The premixed material was internally mixed at 157℃ for 4.5 min, cooled to 115℃, and then 0.25 g of dicumyl peroxide was added and the mixture was continued to be internally mixed for 1.5 min. After the internal mixing was completed, the mixture was placed in a twin-screw extruder with zone 1: 130℃, zone 2: 135℃, zone 3: 135℃, zone 4: 135℃, zone 5: 130℃, die head temperature 135℃, and speed 135 rpm. After extrusion, cooling, granulation, and drying, the polyethylene composite material was obtained.

[0027] Comparative Example 1 Compared with Example 3, the difference is that glycidyl methacrylate is not added, while the other parameters and operating steps remain unchanged.

[0028] Comparative Example 2 Compared with Example 3, the difference is that polypropylene carbonate is not added, while all other parameters and operating steps remain unchanged.

[0029] Comparative Example 3 Compared with Example 3, the difference is that 2-amino-4-hydroxy-6-methylpyrimidine is not added, while the other parameters and operating steps remain unchanged.

[0030] Comparative Example 4 Compared with Example 3, the difference is that 1,6-hexanediamine is not added, while all other parameters and operating steps remain unchanged.

[0031] Comparative Example 5 Compared with Example 3, the difference is that isophthalic acid hydrazide is not added, while the other parameters and operating steps remain unchanged.

[0032] Comparative Example 6 Compared with Example 3, the difference is that N-cyclohexyl-2-benzothiazole sulfenamide is not added, while all other parameters and operating steps remain unchanged.

[0033] Test Example 1: Toughness Test The polyethylene composite materials obtained in Examples 1-3 and Comparative Examples 1-3 were made into V-notch specimens with dimensions of 80mm×10mm×4mm and a depth of 2mm, respectively, and impact strength tests were conducted in accordance with GB / T 1843-2008. The higher the impact strength, the better the toughness. The results are shown in Table 1.

[0034] Table 1

[0035] As shown in Table 1, the impact strength of the polyethylene composite materials prepared in Examples 1-3 of this invention is significantly higher than that in Comparative Examples 1-3. This indicates that the glycidyl methacrylate, polypropylene carbonate, and 2-amino-4-hydroxy-6-methylpyrimidine added in this invention can effectively improve the toughness of the material. Among them, the most significant improvement is seen in Comparative Example 2, which did not add polypropylene carbonate, where the impact strength dropped to 15.96 kJ / m. 2 This is the lowest value among all samples.

[0036] Test Example 2: Abrasion Resistance Test Referring to GB / T 3960-2016, the polyethylene composite materials prepared in Examples 1-3 and Comparative Examples 4-6 were subjected to volume wear tests, and the final results are shown in Table 2.

[0037] Table 2

[0038] As can be seen from Table 2, the volumetric wear values ​​of the polyethylene composite materials prepared in Examples 1-3 of the present invention are significantly lower than those in Comparative Examples 4-6. This indicates that the 1,6-hexanediamine, isophthalohydrazide, and N-cyclohexyl-2-benzothiazole sulfenamide added during the carbon black modification process of the present invention can effectively improve the interfacial bonding strength and dispersibility between carbon black and the matrix, thereby significantly reducing the volumetric wear value of the material and improving its wear resistance.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring 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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A wear resistant polyethylene composite material, characterized in that, By weight, it includes the following parts of raw materials: The composition includes 74-80 parts linear low-density polyethylene, 12.4-16.5 parts toughening component, 5-6.2 parts polyethylene-maleic anhydride copolymer, 8-12 parts modified carbon black, 0.2-0.3 parts dicumyl peroxide, 0.2-0.3 parts epoxidized soybean oil, 0.4-0.6 parts antioxidant 1010, 0.3-0.5 parts antioxidant 168, and 0.4-0.6 parts zinc stearate.

2. The wear-resistant polyethylene composite material according to claim 1, characterized in that, The toughening component comprises 8-10.5 parts by weight of polypropylene carbonate, 1.6-2 parts by weight of 2-amino-4-hydroxy-6-methylpyrimidine, and 2.8-4 parts by weight of glycidyl methacrylate.

3. The wear-resistant polyethylene composite material according to claim 1, characterized in that, The preparation method of the modified carbon black specifically includes the following steps: Carbon black, anhydrous ethanol, and N,N-dimethylformamide were mixed and ultrasonically dispersed. 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and N-hydroxysuccinimide were added and stirred under controlled temperature for the first time. 1,6-hexanediamine was added and stirred under controlled temperature for the second time. Then isophthalohydrazide and N-cyclohexyl-2-benzothiazole sulfenamide were added and stirred under controlled temperature and speed. The mixture was filtered while hot, washed, and dried to constant weight to obtain modified carbon black.

4. The wear-resistant polyethylene composite material according to claim 3, characterized in that, The carbon black comprises 16-20 parts by weight, anhydrous ethanol comprises 140-180 parts by weight, N,N-dimethylformamide comprises 16-20 parts by weight, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide comprises 0.4-0.9 parts by weight, N-hydroxysuccinimide comprises 0.3-0.8 parts by weight, 1,6-hexanediamine comprises 1-1.4 parts by weight, isophthalohydrazide comprises 0.7-1 parts by weight, and N-cyclohexyl-2-benzothiazole sulfenamide comprises 0.4-0.6 parts by weight.

5. The wear-resistant polyethylene composite material according to claim 3, characterized in that, The carbon black includes carbon black N330.

6. The wear-resistant polyethylene composite material according to claim 3, characterized in that, The carbon black is dried at a temperature of 100-105℃ for 3.5-4 hours; the ultrasonic dispersion is performed at a power of 300-400W for 30-40 minutes; the first temperature-controlled stirring is performed at a temperature of 40-45℃ for 30-40 minutes; the second temperature-controlled stirring is performed at a temperature of 50-55℃ for 1.5-2 hours; the temperature and speed controlled stirring is performed at a temperature of 55-60℃ and a speed of 300-330 r / min for 3-4 hours; the filter cake is washed 2-3 times with anhydrous ethanol; and the drying to constant weight is performed at a temperature of 80-100℃.

7. A method for preparing a wear-resistant polyethylene composite material as described in any one of claims 1-6, characterized in that, Specifically, the following steps are included: Linear low-density polyethylene, polypropylene carbonate, polyethylene-maleic anhydride copolymer, 2-amino-4-hydroxy-6-methylpyrimidine, glycidyl methacrylate, epoxidized soybean oil, antioxidant 1010, antioxidant 168 and zinc stearate were mixed and then modified carbon black was added and mixed further to obtain a premix. The premixed material is mixed under controlled temperature, then cooled and mixed again with dicumyl peroxide. After mixing, the material is placed in a twin-screw extruder and subjected to extrusion, cooling, granulation and drying to obtain the polyethylene composite material.

8. The method for preparing the wear-resistant polyethylene composite material according to claim 7, characterized in that, The linear low-density polyethylene comprises 74-80 parts by weight, polypropylene carbonate comprises 8-10.5 parts by weight, polyethylene-maleic anhydride copolymer comprises 5-6.2 parts by weight, 2-amino-4-hydroxy-6-methylpyrimidine comprises 1.6-2 parts by weight, glycidyl methacrylate comprises 2.8-4 parts by weight, epoxidized soybean oil comprises 0.2-0.3 parts by weight, antioxidant 1010 comprises 0.4-0.6 parts by weight, antioxidant 168 comprises 0.3-0.5 parts by weight, zinc stearate comprises 0.4-0.6 parts by weight, modified carbon black comprises 8-12 parts by weight, and dicumyl peroxide comprises 0.2-0.3 parts by weight.

9. The method for preparing the wear-resistant polyethylene composite material according to claim 7, characterized in that, The polypropylene carbonate is vacuum dried at a temperature of 75-80°C for 5-6 hours; the mixing speed is 300-320 r / min for 3-5 minutes; and the continued mixing speed is 700-800 r / min for 2-3 minutes.

10. The method for preparing the wear-resistant polyethylene composite material according to claim 7, characterized in that, The temperature for the temperature-controlled internal mixing is 155-160℃, and the time is 4-5 minutes; the temperature for cooling is 110-120℃; the time for continued internal mixing is 1-1.5 minutes; the parameters of each zone of the twin-screw extruder are: Zone 1: 130-135℃, Zone 2: 135-140℃, Zone 3: 135-140℃, Zone 4: 135-140℃, Zone 5: 130-135℃, Die head temperature: 135-140℃, Speed: 120-150 rpm.

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