A wear-resistant modified polypropylene plastic for turnover boxes and a preparation method thereof

Abstract

The present application relates to the technical field of polypropylene materials, in particular to a wear-resistant modified polypropylene plastic for turnover boxes and a preparation method thereof.The wear-resistant modified polypropylene plastic for turnover boxes comprises the following raw materials in parts by weight: polypropylene 70-80 parts, polypropylene-g-maleic anhydride 3-8 parts, lubricant 1-3 parts, modified talc powder 10-15 parts, titanium dioxide 4-8 parts, microcrystalline cellulose 5-10 parts, and epoxidized ultraviolet absorber 0.5-2.0 parts.The present application prepares the wear-resistant modified polypropylene plastic by compounding polypropylene, polypropylene-g-maleic anhydride, lubricant, modified talc powder, titanium dioxide, microcrystalline cellulose and epoxidized ultraviolet absorber, which not only has excellent mechanical properties, but also has excellent aging resistance and antibacterial properties, thereby prolonging the service life.

Description

Technical Field

[0001] This invention relates to the field of polypropylene materials technology, specifically to a wear-resistant modified polypropylene plastic for turnover boxes and its preparation method. Background Technology

[0002] With the rapid development of industry and the booming logistics sector, the demand for turnover boxes, as an important tool for cargo transportation, storage, and handling, continues to grow. Traditional turnover box materials such as metal and wood have problems such as heavy weight, easy corrosion, high cost, and environmental unfriendliness. Polypropylene (PP), as a common thermoplastic, has gradually become the preferred material for turnover box manufacturing due to its advantages such as light weight, low cost, easy processing, and chemical resistance.

[0003] However, ordinary polypropylene has poor abrasion resistance and is prone to wear and scratches during long-term use, affecting the service life and performance of the turnover box. Furthermore, polypropylene is an inert polymer material and lacks antibacterial properties, making it susceptible to bacterial and microbial growth in humid or warm environments, thus affecting hygiene and safety, particularly in food and pharmaceutical logistics applications. In addition, polypropylene is prone to polymer degradation under ultraviolet radiation, causing the material to become brittle and discolored, further impacting its appearance and performance.

[0004] To address the aforementioned issues, we propose a wear-resistant modified polypropylene plastic for turnover boxes and its preparation method. Summary of the Invention

[0005] The purpose of this invention is to provide a wear-resistant modified polypropylene plastic for turnover boxes and its preparation method, so as to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for preparing wear-resistant modified polypropylene plastic for turnover boxes includes the following steps:

[0008] Polypropylene, polypropylene-g-maleic anhydride, lubricant, modified talc, titanium dioxide, microcrystalline cellulose, and epoxidized ultraviolet absorber are blended to obtain a mixture. The mixture is then extruded and granulated in a twin-screw extruder to obtain wear-resistant modified polypropylene plastic for turnover boxes.

[0009] Furthermore, the wear-resistant modified polypropylene plastic for the turnover box comprises the following raw materials in parts by weight: 70-80 parts of polypropylene, 3-8 parts of polypropylene-g-maleic anhydride, 1-3 parts of lubricant, 10-15 parts of modified talc, 4-8 parts of titanium dioxide, 5-10 parts of microcrystalline cellulose, and 0.5-2.0 parts of epoxidized ultraviolet absorber.

[0010] Furthermore, the lubricant is polyethylene wax.

[0011] Furthermore, the modified talc powder is prepared as follows:

[0012] Step A: Mix talc powder, anhydrous ethanol and deionized water evenly to obtain a mixed solution. Adjust the pH of the system to 3-4, heat to 50-70℃, introduce nitrogen gas, add vinyltrimethoxysilane, react for 4-6 hours, and after centrifugation, washing and drying, obtain vinyl talc powder.

[0013] Step B: Dissolve triphenylphosphine in ethanol, add butyl acetate and tannic acid and mix well. Raise the oil bath temperature to 105-115℃, add cinnamic acid-based epoxy monomer, and reflux for 22-24 hours. After filtration, washing and drying, vinyl tannic acid is obtained.

[0014] Step C: Mix vinyl talc powder and deionized water evenly, add methyl methacrylate, methacrylamide and vinyl tannic acid, purge with nitrogen gas, add potassium persulfate, and react at 70-80℃ for 10-12 hours. After centrifugation, washing and drying, modified talc powder is obtained.

[0015] Further, in step A, the mass ratio of talc, anhydrous ethanol, deionized water and vinyltrimethoxysilane is 1:(15-20):(3-5):(1-3).

[0016] Furthermore, in step B, the mass ratio of triphenylphosphine to ethanol is 1:(20-25).

[0017] Further, in step B, the mass ratio of tannic acid, cinnamic acid epoxy monomer, butyl acetate and triphenylphosphine is 1:(1.4-1.8):(3-5):(0.03-0.05).

[0018] Furthermore, the preparation method of the cinnamic acid-based epoxy monomer is as follows:

[0019] Under nitrogen protection, ethylene glycol diglycidyl ether, cinnamic acid and p-toluenesulfonic acid monohydrate were mixed evenly and reacted at 100-120℃ for 5-8 hours. The mixture was then extracted three times with deionized water, and the organic phase was collected to obtain the cinnamic acid-based epoxy monomer.

[0020] Further, the mass ratio of the ethylene glycol diglycidyl ether, cinnamic acid and p-toluenesulfonic acid monohydrate is 1:(0.06-0.12):(0.01-0.03).

[0021] Further, in step C, the mass ratio of vinyl talc to deionized water is 1:(50-60).

[0022] Further, in step C, the mass ratio of vinyl talc, methyl methacrylate, methacrylamide and vinyl tannic acid is 1:(2-3):(1-2):(0.5-1.5).

[0023] Furthermore, the amount of potassium persulfate used is 1-3% of the total mass of vinyl talc, methyl methacrylate, methacrylamide, and vinyl tannic acid.

[0024] Furthermore, the preparation method of the epoxidized ultraviolet absorber is as follows:

[0025] Epichlorohydrin was heated to 50-60℃, and a mixed solution of 2,4-dihydroxybenzophenone and sodium hydroxide aqueous solution was added dropwise under nitrogen protection. The addition was completed in 1-2 hours, and the reaction was continued in a constant temperature oil bath at 80-90℃ for 4-6 hours. After washing, filtering and drying, an epoxidized ultraviolet absorber was obtained.

[0026] Furthermore, the mass ratio of epichlorohydrin, 2,4-dihydroxybenzophenone, and sodium hydroxide aqueous solution is 1:(0.5-0.8):(20-30), and the concentration of sodium hydroxide aqueous solution is 2 mol / L.

[0027] Furthermore, the twin-screw extruder is set to a temperature of 220-230℃ and a screw speed of 200-500 rpm.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. This invention discloses a wear-resistant modified polypropylene plastic for turnover boxes and its preparation method. Using flexible long-chain ethylene glycol diglycidyl ether (EGDE) and bio-based monomer cinnamic acid (CA) as raw materials, a transesterification method is used to react and obtain a cinnamic acid-based epoxy monomer. Then, the cinnamic acid-based epoxy monomer is used to perform an epoxy ring-opening reaction on the phenolic hydroxyl groups of tannic acid, introducing double bonds to synthesize crosslinkable copolymerizable vinyl tannic acid. Its molecular structure possesses the rigid structure of tannic acid, effectively improving the material's hardness, stiffness, and wear resistance. Simultaneously, the flexible long chain of EGDE acts as a toughening phase, effectively improving the material's toughness. Furthermore, cinnamic acid itself has excellent UV resistance and antibacterial properties, which, combined with the natural antioxidant properties of tannic acid, jointly improve the material's stability and durability in outdoor environments, while significantly inhibiting bacterial growth and reproduction, ensuring the hygiene and safety of items inside the turnover box.

[0030] Surface modification of talc powder with vinyltrimethoxysilane improves its dispersibility and introduces double bonds. Then, methyl methacrylate, methacrylamide, and vinyl tannic acid are copolymerized and coated onto the surface of the talc powder using a free radical copolymerization method, forming a "core-shell" structure that improves the strength and toughness of polypropylene plastic. In addition, the amino groups provided by methacrylamide in the shell can further crosslink with epoxidized ultraviolet absorbers, fundamentally solving the problems of easy migration, precipitation, and poor durability of ultraviolet absorbers in traditional addition methods. This greatly improves the long-term durability of turnover boxes against yellowing and aging in harsh outdoor environments.

[0031] 2. This invention discloses a wear-resistant modified polypropylene plastic for turnover boxes and its preparation method. The wear-resistant modified polypropylene plastic is prepared by compounding polypropylene, polypropylene-g-maleic anhydride (PP-g-MAH), lubricant, modified talc, microcrystalline cellulose, and an epoxidized ultraviolet absorber. PP-g-MAH improves the compatibility of polypropylene with other materials and enhances the adhesive properties of the composite material, thereby improving the overall strength and impact resistance of the material. The lubricant reduces friction during processing, improves the fluidity of the plastic, and enhances molding smoothness. Modified talc, as a filler, enhances the rigidity, wear resistance, antibacterial properties, and aging resistance of polypropylene while reducing costs. Titanium dioxide improves the light stability and anti-aging properties of the plastic and provides antibacterial effects under certain conditions. Microcrystalline cellulose acts as a reinforcing agent, improving the mechanical properties and stability of the material. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that there are no special restrictions on the suppliers of all raw materials involved in this invention. Exemplary examples include (in this embodiment) polypropylene: model is Hyosung R701 from South Korea; polypropylene-g-maleic anhydride: brand name CMG9801, purchased from Jia Yi Rong Polymer (Shanghai) Co., Ltd.; talc: particle size of 5000 mesh, sourced from Jiangyin Guangyuan Ultrafine Powder Co., Ltd.; titanium dioxide: brand name Evonik AEROXIDE P25; microcrystalline cellulose: model name PH112, sourced from Huzhou Linghu Xinwang Chemical Co., Ltd.; lubricant: polyethylene wax, model name Honeywell AC-6A.

[0034] Unless otherwise specified, all the following quantities are parts by weight.

[0035] Example 1: A method for preparing wear-resistant modified polypropylene plastic for turnover boxes, comprising the following processes:

[0036] 70 parts polypropylene, 3 parts polypropylene-g-maleic anhydride, 1 part lubricant, 10 parts modified talc, 4 parts titanium dioxide, 5 parts microcrystalline cellulose, and 0.5 parts epoxidized ultraviolet absorber were blended to obtain a mixture. The mixture was then extruded and granulated in a twin-screw extruder. The twin-screw extruder was set to a temperature of 220℃ and a screw speed of 500 rpm to obtain wear-resistant modified polypropylene plastic for turnover boxes.

[0037] The preparation method of modified talc is as follows:

[0038] Step A: Mix 10 parts talc powder, 150 parts anhydrous ethanol and 30 parts deionized water evenly to obtain a mixed solution. Adjust the pH of the system to 3, heat to 50°C, introduce nitrogen gas, add 10 parts vinyltrimethoxysilane, react for 4 hours, and obtain vinyl talc powder after centrifugation, washing and drying.

[0039] Step B: Under nitrogen protection, 7 parts of ethylene glycol diglycidyl ether, 0.42 parts of cinnamic acid, and 0.07 parts of p-toluenesulfonic acid monohydrate were mixed evenly and reacted at 100°C for 5 hours. The mixture was extracted three times with deionized water, and the organic phase was collected to obtain cinnamic acid-based epoxy monomers. 0.15 parts of triphenylphosphine were dissolved in 3 parts of ethanol, and 15 parts of butyl acetate and 5 parts of tannic acid were added and mixed evenly. The oil bath temperature was raised to 105°C, and 7 parts of cinnamic acid-based epoxy monomers were added. The mixture was refluxed for 22 hours. After filtration, washing, and drying, vinyl tannic acid was obtained.

[0040] Step C: Mix 10 parts of vinyl talc powder and 500 parts of deionized water evenly, add 20 parts of methyl methacrylate, 10 parts of methacrylamide and 5 parts of vinyl tannic acid, purge with nitrogen gas, add 0.45 parts of potassium persulfate, react at 70°C for 10 hours, and after centrifugation, washing and drying, obtain modified talc powder.

[0041] The preparation method of the epoxidized ultraviolet absorber is as follows:

[0042] One part of epichlorohydrin was heated to 50°C, and under nitrogen protection, a mixed solution of 0.5 parts of 2,4-dihydroxybenzophenone and 20 parts of 2 mol / L sodium hydroxide aqueous solution was added dropwise over 1 hour. The reaction was continued for 4 hours in a constant temperature oil bath at 80°C. After washing, filtering and drying, an epoxidized ultraviolet absorber was obtained.

[0043] Example 2: A method for preparing wear-resistant modified polypropylene plastic for turnover boxes, comprising the following processes:

[0044] 75 parts polypropylene, 5 parts polypropylene-g-maleic anhydride, 2 parts lubricant, 12 parts modified talc, 6 parts titanium dioxide, 8 parts microcrystalline cellulose and 1 part epoxidized ultraviolet absorber were blended to obtain a mixture. The mixture was then extruded and granulated in a twin-screw extruder. The twin-screw extruder was set at a temperature of 225℃ and a screw speed of 300 rpm to obtain wear-resistant modified polypropylene plastic for turnover boxes.

[0045] The preparation method of modified talc is as follows:

[0046] Step A: Mix 12 parts talc powder, 200 parts anhydrous ethanol and 48 parts deionized water evenly to obtain a mixed solution. Adjust the pH of the system to 3.5, heat to 60°C, introduce nitrogen gas, add 24 parts vinyltrimethoxysilane, react for 5 hours, and after centrifugation, washing and drying, obtain vinyl talc powder.

[0047] Step B: Under nitrogen protection, 19 parts of ethylene glycol diglycidyl ether, 1.8 parts of cinnamic acid and 0.38 parts of p-toluenesulfonic acid monohydrate were mixed evenly and reacted at 110°C for 7 hours. The mixture was extracted three times with deionized water, and the organic phase was collected to obtain cinnamic acid-based epoxy monomers. 0.48 parts of triphenylphosphine were dissolved in 10 parts of ethanol, and 48 parts of butyl acetate and 12 parts of tannic acid were added and mixed evenly. The oil bath temperature was raised to 110°C, and 19 parts of cinnamic acid-based epoxy monomers were added. The mixture was refluxed for 23 hours. After filtration, washing and drying, vinyl tannic acid was obtained.

[0048] Step C: Mix 12 parts of vinyl talc powder and 660 parts of deionized water evenly, add 30 parts of methyl methacrylate, 18 parts of methacrylamide and 12 parts of vinyl tannic acid, purge with nitrogen gas, add 1.44 parts of potassium persulfate, react at 75°C for 11 hours, and after centrifugation, washing and drying, obtain modified talc powder.

[0049] The preparation method of the epoxidized ultraviolet absorber is as follows:

[0050] 1.5 parts of epichlorohydrin were heated to 55°C, and under nitrogen protection, a mixed solution of 1 part of 2,4-dihydroxybenzophenone and 37 parts of 2 mol / L sodium hydroxide aqueous solution was added dropwise over 1.5 h. The reaction was continued for 5 h in a constant temperature oil bath at 85°C. After washing, filtering and drying, an epoxidized ultraviolet absorber was obtained.

[0051] Example 3: A method for preparing wear-resistant modified polypropylene plastic for turnover boxes, comprising the following processes:

[0052] 80 parts of polypropylene, 8 parts of polypropylene-g-maleic anhydride, 3 parts of lubricant, 15 parts of modified talc, 8 parts of titanium dioxide, 10 parts of microcrystalline cellulose, and 2.0 parts of epoxidized ultraviolet absorber were blended to obtain a mixture. The mixture was then extruded and granulated in a twin-screw extruder. The twin-screw extruder was set to a temperature of 230℃ and a screw speed of 200 rpm to obtain wear-resistant modified polypropylene plastic for turnover boxes.

[0053] The preparation method of modified talc is as follows:

[0054] Step A: Mix 15 parts talc powder, 300 parts anhydrous ethanol and 60 parts deionized water evenly to obtain a mixed solution. Adjust the pH of the system to 4, heat to 70°C, introduce nitrogen gas, add 45 parts vinyltrimethoxysilane, react for 6 hours, and after centrifugation, washing and drying, obtain vinyl talc powder.

[0055] Step B: Under nitrogen protection, 40 parts of ethylene glycol diglycidyl ether, 4.8 parts of cinnamic acid and 1.2 parts of p-toluenesulfonic acid monohydrate were mixed evenly and reacted at 120°C for 8 hours. The mixture was extracted three times with deionized water, and the organic phase was collected to obtain cinnamic acid-based epoxy monomers. 1.1 parts of triphenylphosphine were dissolved in 27.5 parts of ethanol, and 112.5 parts of butyl acetate and 22.5 parts of tannic acid were added and mixed evenly. The oil bath temperature was raised to 115°C, and 40.5 parts of cinnamic acid-based epoxy monomers were added. The mixture was refluxed for 24 hours. After filtration, washing and drying, vinyl tannic acid was obtained.

[0056] Step C: Mix 15 parts of vinyl talc powder and 900 parts of deionized water evenly, add 45 parts of methyl methacrylate, 30 parts of methacrylamide and 22.5 parts of vinyl tannic acid, purge with nitrogen gas, add 3.3 parts of potassium persulfate, react at 80°C for 12 hours, and after centrifugation, washing and drying, obtain modified talc powder.

[0057] The preparation method of the epoxidized ultraviolet absorber is as follows:

[0058] 2.5 parts of epichlorohydrin were heated to 60°C, and under nitrogen protection, a mixed solution of 2 parts of 2,4-dihydroxybenzophenone and 75 parts of 2 mol / L sodium hydroxide aqueous solution was added dropwise over 2 hours. The reaction was then continued for 6 hours in a constant temperature oil bath at 90°C. After washing, filtering and drying, an epoxidized ultraviolet absorber was obtained.

[0059] Comparative Example 1: Comparative Example 1 is based on Example 2. In Comparative Example 1, the modified talc powder is replaced with the same mass of talc powder, and the remaining process steps and reaction parameters are the same as in Example 2.

[0060] Comparative Example 2: Comparative Example 2 is based on Example 2, except that vinyl tannins are not introduced in Comparative Example 2, and the remaining process steps and reaction parameters are the same as in Example 2;

[0061] The preparation method of modified talc is as follows:

[0062] Step A: Mix 12 parts talc powder, 200 parts anhydrous ethanol and 48 parts deionized water evenly to obtain a mixed solution. Adjust the pH of the system to 3.5, heat to 60°C, introduce nitrogen gas, add 24 parts vinyltrimethoxysilane, react for 5 hours, and after centrifugation, washing and drying, obtain vinyl talc powder.

[0063] Step B: Mix 12 parts of vinyl talc powder and 660 parts of deionized water evenly, add 30 parts of methyl methacrylate and 18 parts of methacrylamide, purge with nitrogen gas, add 1.44 parts of potassium persulfate, react at 75°C for 11 hours, and obtain modified talc powder after centrifugation, washing and drying.

[0064] Comparative Example 3: Comparative Example 3 is based on Example 2, except that the epoxidized ultraviolet absorber is replaced with the same mass of ultraviolet absorber, and the remaining process steps and reaction parameters are the same as in Example 2.

[0065] A method for preparing wear-resistant modified polypropylene plastic for turnover boxes includes the following processes:

[0066] 75 parts polypropylene, 5 parts polypropylene-g-maleic anhydride, 2 parts lubricant, 12 parts modified talc, 6 parts titanium dioxide, 8 parts microcrystalline cellulose, and 1 part epoxidized ultraviolet absorber were blended to obtain a mixture. The mixture was then extruded and granulated in a twin-screw extruder. The twin-screw extruder was set to a temperature of 225℃ and a screw speed of 300 rpm to obtain wear-resistant modified polypropylene plastic for turnover boxes.

[0067] Comparative Example 4: Comparative Example 4 is based on Example 2. In step C of Comparative Example 4, the mass ratio of vinyl talc, methyl methacrylate, methacrylamide and vinyl tannic acid is 1:2.5:1.5:0.4. The remaining process steps and reaction parameters are the same as in Example 2.

[0068] The preparation method of modified talc is as follows:

[0069] Step A: Mix 12 parts talc powder, 200 parts anhydrous ethanol and 48 parts deionized water evenly to obtain a mixed solution. Adjust the pH of the system to 3.5, heat to 60°C, introduce nitrogen gas, add 24 parts vinyltrimethoxysilane, react for 5 hours, and after centrifugation, washing and drying, obtain vinyl talc powder.

[0070] Step B: Under nitrogen protection, 19 parts of ethylene glycol diglycidyl ether, 1.8 parts of cinnamic acid and 0.38 parts of p-toluenesulfonic acid monohydrate were mixed evenly and reacted at 110°C for 7 hours. The mixture was extracted three times with deionized water, and the organic phase was collected to obtain cinnamic acid-based epoxy monomers. 0.48 parts of triphenylphosphine were dissolved in 10 parts of ethanol, and 48 parts of butyl acetate and 12 parts of tannic acid were added and mixed evenly. The oil bath temperature was raised to 110°C, and 19 parts of cinnamic acid-based epoxy monomers were added. The mixture was refluxed for 23 hours. After filtration, washing and drying, vinyl tannic acid was obtained.

[0071] Step C: Mix 12 parts of vinyl talc powder and 660 parts of deionized water evenly, add 30 parts of methyl methacrylate, 18 parts of methacrylamide and 4.8 parts of vinyl tannic acid, purge with nitrogen gas, add 1.44 parts of potassium persulfate, react at 75°C for 11 hours, and obtain modified talc powder after centrifugation, washing and drying.

[0072] Experiment: Test samples were prepared using the wear-resistant modified polypropylene plastics for turnover boxes obtained in Examples 1-3 and Comparative Examples 1-4. The properties of these samples were tested, and the results were recorded.

[0073] Wear test: The wear amount was determined according to GB / T 3960-2016. The test ring rotated at 200 r / min, the test time was 2 h, and the load was 196 N.

[0074] Tensile property test: Tensile properties were determined according to GB / T 1040.2-2022. The sample size was 150mm×10mm×4mm, the test temperature was 25℃, and the tensile rate was 50mm / min.

[0075] Aging resistance test: Xenon lamp aging test was conducted according to GB / T 16422.2-2022: using a xenon lamp as the light source, with a radiation intensity of 550W / m². 2 The blackboard temperature was 45℃, the chamber temperature was 30℃, the relative humidity was 80%, and the test time was 360h. The tensile strength before and after aging was measured, and the performance degradation rate was calculated as 1 - tensile strength after aging / initial tensile strength.

[0076] Antibacterial performance test: The antibacterial performance was determined according to the film application method in GB / T 31402-2023. The test strain was Staphylococcus aureus (bacterial concentration of 3.0 × 10⁻⁶). 5 (cfu / mL).

[0077] The test results are shown in Table 1.

[0078] Table 1. Test results of wear-resistant modified polypropylene plastic for turnover boxes

[0079]

[0080] Based on the data in the table above, the following conclusions can be clearly drawn:

[0081] Combining Examples 1-3 and Comparative Examples 1-4, it can be seen that the wear-resistant modified polypropylene plastic for turnover boxes prepared by the present invention not only has excellent mechanical properties, but also excellent aging resistance and antibacterial properties. Compared with Examples 1-3, the wear amount of the products obtained in Comparative Examples 1 and 2 increased, while the tensile strength, aging resistance, and antibacterial rate decreased. This indicates that the modified talc powder prepared by the present invention has better compatibility, aging resistance, and antibacterial effect than talc powder, thereby effectively improving the comprehensive performance of the material. At the same time, the present invention further improves the mechanical properties and antibacterial rate of the material by introducing vinyl tannins. The aging resistance of Comparative Example 3 decreased because the ultraviolet absorber used did not introduce epoxy groups. The properties of the modified talc powder decreased due to the reduction in the amount of vinyl tannins added in Comparative Example 4.

[0082] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A method for preparing wear-resistant modified polypropylene plastic for turnover boxes, characterized in that: Includes the following steps: Polypropylene, polypropylene-g-maleic anhydride, lubricant, modified talc, titanium dioxide, microcrystalline cellulose, and epoxidized ultraviolet absorber are blended to obtain a mixture. The mixture is then extruded and granulated in a twin-screw extruder to obtain wear-resistant modified polypropylene plastic for turnover boxes. The modified talc is first surface-modified with vinyltrimethoxysilane, and then coated with methyl methacrylate, methacrylamide, and vinyl tannic acid via free radical copolymerization to obtain the final product. The modified talc powder is prepared as follows: Step A: Mix talc powder, anhydrous ethanol and deionized water evenly to obtain a mixed solution. Adjust the pH of the system to 3-4, heat to 50-70℃, introduce nitrogen gas, add vinyltrimethoxysilane, react for 4-6 hours, and after centrifugation, washing and drying, obtain vinyl talc powder. Step B: Dissolve triphenylphosphine in ethanol, add butyl acetate and tannic acid and mix well. Raise the oil bath temperature to 105-115℃, add cinnamic acid-based epoxy monomer, and reflux for 22-24 hours. After filtration, washing and drying, vinyl tannic acid is obtained. Step C: Mix vinyl talc powder and deionized water evenly, add methyl methacrylate, methacrylamide and vinyl tannic acid, purge with nitrogen gas, add potassium persulfate, and react at 70-80℃ for 10-12 hours. After centrifugation, washing and drying, modified talc powder is obtained.

2. The method for preparing wear-resistant modified polypropylene plastic for turnover boxes according to claim 1, characterized in that: The wear-resistant modified polypropylene plastic for the turnover box comprises the following raw materials in parts by weight: 70-80 parts polypropylene, 3-8 parts polypropylene-g-maleic anhydride, 1-3 parts lubricant, 10-15 parts modified talc, 4-8 parts titanium dioxide, 5-10 parts microcrystalline cellulose, and 0.5-2.0 parts epoxidized ultraviolet absorber.

3. The method for preparing wear-resistant modified polypropylene plastic for turnover boxes according to claim 1, characterized in that: In step A, the mass ratio of talc, anhydrous ethanol, deionized water and vinyltrimethoxysilane is 1:(15-20):(3-5):(1-3).

4. The method for preparing wear-resistant modified polypropylene plastic for turnover boxes according to claim 1, characterized in that: In step B, the mass ratio of tannic acid, cinnamic acid epoxy monomer, butyl acetate and triphenylphosphine is 1:(1.4-1.8):(3-5):(0.03-0.05).

5. The method for preparing wear-resistant modified polypropylene plastic for turnover boxes according to claim 4, characterized in that: The preparation method of the cinnamic acid-based epoxy monomer is as follows: Under nitrogen protection, ethylene glycol diglycidyl ether, cinnamic acid and p-toluenesulfonic acid monohydrate were mixed evenly and reacted at 100-120℃ for 5-8 hours. The mixture was then extracted three times with deionized water, and the organic phase was collected to obtain the cinnamic acid-based epoxy monomer.

6. The method for preparing wear-resistant modified polypropylene plastic for turnover boxes according to claim 1, characterized in that: In step C, the mass ratio of vinyl talc, methyl methacrylate, methacrylamide, and vinyl tannic acid is 1:(2-3):(1-2):(0.5-1.5).

7. The method for preparing wear-resistant modified polypropylene plastic for turnover boxes according to claim 1, characterized in that: The preparation method of the epoxidized ultraviolet absorber is as follows: Epichlorohydrin was heated to 50-60℃, and a mixed solution of 2,4-dihydroxybenzophenone and sodium hydroxide aqueous solution was added dropwise under nitrogen protection. The addition was completed in 1-2 hours, and the reaction was continued in a constant temperature oil bath at 80-90℃ for 4-6 hours. After washing, filtering and drying, an epoxidized ultraviolet absorber was obtained.

8. The method for preparing wear-resistant modified polypropylene plastic for turnover boxes according to claim 1, characterized in that: The twin-screw extruder is set to a temperature of 220-230℃ and a screw speed of 200-500 rpm.

9. A wear-resistant modified polypropylene plastic for turnover boxes prepared by the preparation method according to any one of claims 1-8.

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