A corrosion-resistant high-density polyethylene sheet and preparation method thereof

Abstract

This invention belongs to the field of polymer materials technology, specifically relating to a corrosion-resistant high-density polyethylene (HDPE) sheet and its preparation method. The corrosion-resistant HDPE sheet of this invention comprises the following components: 50-60 parts of surface-modified ultra-high molecular weight polyethylene (UHMWPE), 50-60 parts of high-density polyethylene (HDPE), 16-20 parts of glass microspheres, 6-10 parts of calcium carbonate, 2-6 parts of lubricant, and 0.2-0.4 parts of antioxidant. The preparation method of the surface-modified UHMWPE includes: firstly, pre-irradiating the UHMWPE to obtain pre-irradiated UHMWPE; secondly, grafting the pre-irradiated UHMWPE to obtain grafted UHMWPE; and thirdly, modifying the grafted UHMWPE with maleic rosin acrylate to obtain surface-modified UHMWPE.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a corrosion-resistant high-density polyethylene sheet and its preparation method. Background Art

[0002] Polyethylene sheets are a type of polymer material made primarily from polyethylene resin. Besides possessing excellent impact resistance, abrasion resistance, hygiene, non-toxicity, corrosion resistance, self-lubrication, and low-temperature resistance, polyethylene also exhibits superior properties such as water resistance, non-adhesion, and low density, making its overall performance unique among many materials. Polyethylene sheets have a wide range of applications, including vacuum chamber panels, paper cutter bushings, sludge scrapers in wastewater treatment plants, slurry pump impellers, and bearing liners. Due to its abrasion resistance and self-lubrication, polyethylene is highly favored, demonstrating superior performance not only in the chemical and biomedical fields but also in the padding of medical devices such as artificial hip and knee joints, as well as tissue scaffolds and blood transfusion pumps.

[0003] Chinese patent (publication number CN117417585A) discloses an easily processed, ultra-wear-resistant, ultra-high molecular weight polyethylene (UHMWPE) composition and a process for producing sheets from this composition. The process for producing sheets from the easily processed, ultra-wear-resistant, UHMWPE composition includes the following steps: adding UHMWPE resin, high-flowability high-density polyethylene resin, antioxidant, external lubricant, wear-resistant agent, and thermal expansion / contraction inhibitor into a preheated high-speed mixer; starting the high-speed mixer for mixing; discharging the mixture; sealing and storing the mixture to obtain the composition; and extruding the composition using a single-screw extruder to obtain the sheet. However, the polyethylene sheets prepared using the prior art have insufficient corrosion resistance, affecting their further application.

[0004] Therefore, optimizing the composition of polyethylene sheets to prepare high-density polyethylene sheets that effectively improve corrosion resistance while ensuring good wear resistance has become a research direction. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a corrosion-resistant high-density polyethylene sheet and its preparation method. The present invention uses ultra-high molecular weight polyethylene (UHMWPE) and high-density polyethylene (HDPE) as main raw materials, and performs surface modification treatment on UHMWPE. Combined with glass microspheres, calcium carbonate, lubricants, and other components, a high-density polyethylene sheet is prepared, which improves corrosion resistance while ensuring good wear resistance.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A first aspect of the present invention provides a corrosion-resistant high-density polyethylene sheet, comprising, by weight, the following components:

[0008] 50-60 parts surface-modified ultra-high molecular weight polyethylene, 50-60 parts high-density polyethylene, 16-20 parts glass microspheres, 6-10 parts calcium carbonate, 2-6 parts lubricant and 0.2-0.4 parts antioxidant.

[0009] As a preferred embodiment, the weight parts of the surface-modified ultra-high molecular weight polyethylene described in this invention can be 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, or 60 parts, etc.

[0010] As a preferred embodiment, the weight parts of the high-density polyethylene in this invention can be 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, or 60 parts, etc.

[0011] As a preferred embodiment, the weight fraction of the glass microspheres in this invention can be 16 parts, 17 parts, 18 parts, 19 parts, or 20 parts, etc.

[0012] As a preferred embodiment, the calcium carbonate in this invention can be in the form of 6, 7, 8, 9, or 10 parts by weight.

[0013] As a preferred embodiment, the antioxidant in this invention can be in the following weight proportions: 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, or 0.4 parts, etc.

[0014] As a preferred embodiment, the preparation method of the surface-modified ultra-high molecular weight polyethylene includes: firstly, pre-irradiating ultra-high molecular weight polyethylene to obtain pre-irradiated ultra-high molecular weight polyethylene; secondly, grafting the pre-irradiated ultra-high molecular weight polyethylene to obtain grafted ultra-high molecular weight polyethylene; and thirdly, modifying the grafted ultra-high molecular weight polyethylene with maleic rosin acrylate to obtain surface-modified ultra-high molecular weight polyethylene.

[0015] As a preferred embodiment, the grafting treatment step includes: immersing pre-irradiated ultra-high molecular weight polyethylene in a 0.2~0.4mol / L N,N'-vinylbisacrylamide aqueous solution, placing it under nitrogen atmosphere, treating it at 80~90℃ for 12~16h, washing with deionized water, and drying to obtain grafted ultra-high molecular weight polyethylene.

[0016] As a preferred embodiment, the pre-irradiation step includes: washing and drying the ultra-high molecular weight polyethylene, and treating it with Co-γ rays in an air atmosphere to obtain pre-irradiated ultra-high molecular weight polyethylene.

[0017] As a preferred embodiment, the modification treatment step includes: immersing the grafted ultra-high molecular weight polyethylene in an ethanol solution of 0.02~0.04 mol / L maleic rosin ethylene glycol acrylate, and modifying it at 85~95℃ for 60~80 min.

[0018] As a preferred embodiment, the structural formula of the ethylene glycol acrylate of maleic rosin is:

[0019] .

[0020] This invention utilizes a Co-γ ray pre-radiation grafting method to graft N,N'-vinylbisacrylamide onto ultra-high molecular weight polyethylene. N,N'-vinylbisacrylamide has two double bonds, and some of these double bonds remain unreacted during the pre-radiation grafting process. This allows them to polymerize with maleic rosin ethylene glycol acrylate, thus preparing surface-modified ultra-high molecular weight polyethylene.

[0021] As a preferred embodiment, the glass microspheres are glass microsphere composite materials;

[0022] The preparation method of the glass microsphere composite material includes: firstly, subjecting commercially available glass microspheres to silane coupling treatment to obtain silane-coupled glass microspheres; then, subjecting the silane-coupled glass microspheres to epoxy vinyl ester resin for composite treatment to obtain the glass microsphere composite material.

[0023] As a preferred embodiment, the silane coupling treatment step includes: adding 16-20 parts by weight of commercially available glass microspheres to 100-120 parts by weight of a 1.2-1.6 mol / L sodium hydroxide solution, stirring at 80-90°C for 70-80 min, washing with water and drying, then adding to a mixture of 90-100 parts by weight of anhydrous ethanol and 90-100 parts by weight of deionized water, then adding 8-10 parts by weight of the silane coupling agent vinyltrimethoxysilane, stirring at 70-80°C for 2-3 h, filtering, and drying to obtain silane-coupled glass microspheres.

[0024] As a preferred embodiment, the composite treatment steps include: adding 16-20 parts of silane-coupled glass microspheres to 20-30 parts of epoxy vinyl ester resin under a nitrogen atmosphere, then adding 0.2-0.4 parts of benzoyl peroxide, stirring at 70-80°C for 2-3 hours, centrifuging, and filtering to obtain the glass microsphere composite material.

[0025] As a preferred embodiment, the commercially available glass microspheres have a particle size of 2~10μm.

[0026] This invention first treats glass microspheres with sodium hydroxide using an alkali, then performs silane coupling treatment with vinyltrimethoxysilane to introduce double bonds on the surface of the glass microspheres, and then combines them with double bonds in epoxy vinyl ester resin to prepare a glass microsphere composite material.

[0027] As a preferred embodiment, the lubricant is silicone powder or calcium stearate.

[0028] As a preferred embodiment, the antioxidant is antioxidant 264 or antioxidant 168.

[0029] A second aspect of the present invention provides a method for preparing corrosion-resistant high-density polyethylene sheets as described in the first aspect, comprising the following steps:

[0030] By weight, 50-60 parts of surface-modified ultra-high molecular weight polyethylene, 50-60 parts of high-density polyethylene, 16-20 parts of glass microspheres, 6-10 parts of calcium carbonate, 2-6 parts of lubricant and 0.2-0.4 parts of antioxidant are added to a high-speed mixer. After mixing, the mixture is discharged and then extruded through a screw extruder to obtain corrosion-resistant high-density polyethylene sheets.

[0031] As a preferred embodiment, the extrusion processing conditions include a temperature of 190~200℃.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The surface-modified ultra-high molecular weight polyethylene of the present invention forms an anti-corrosion film on the surface by successively introducing N,N'-vinylbisacrylamide and maleic rosin ethylene glycol acrylate. Its surface structure is dense, the pores are significantly reduced, and the corrosion potential is increased, which can significantly improve the corrosion resistance. At the same time, the acyl group of N,N'-vinylbisacrylamide forms hydrogen bonds with the carboxyl group and ester group of maleic rosin ethylene glycol acrylate during the polymerization process, constructing a dense network structure and improving wear resistance.

[0034] (2) The epoxy vinyl ester resin in the glass microsphere composite material of the present invention can form a dense protective layer, reducing the contact with corrosive media. At the same time, the ester bond and benzene ring structure of epoxy vinyl ester resin make it relatively stable in acid and alkaline environments, and significantly improve its corrosion resistance. Meanwhile, epoxy vinyl ester resin can uniformly disperse external forces to the surface of microspheres, reduce local stress concentration, and avoid increased wear caused by crack propagation. Detailed Implementation

[0035] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0036] The sources of some components in the examples and comparative examples are as follows:

[0037] Ultra-high molecular weight polyethylene, item number P77511, purchased from Shanghai Jizhi Biochemical Technology Co., Ltd.

[0038] N,N'-vinylbisacrylamide, product number E124733, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0039] Commercially available glass microbeads I, brand name ZMN-149103-20, with a particle size of 5μm, were purchased from Shanghai Zhenzhun Biotechnology Co., Ltd.

[0040] Commercially available glass microbeads II, brand name ZMN-149115-50, with a particle size of 90μm, were purchased from Shanghai Zhenzhun Biotechnology Co., Ltd.

[0041] Vinyltrimethoxysilane, CAS No. 2768-02-7, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0042] Epoxy vinyl ester resin, grade MFE-2, was purchased from East China University of Science and Technology Huachang Polymer Co., Ltd.

[0043] Benzoyl peroxide, CAS No. 94-36-0, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0044] High-density polyethylene, grade 5000S, purchased from Yanshan Petrochemical;

[0045] Calcium carbonate, product number C886288, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0046] Silicone powder, model RM4-7081, purchased from Dow Corning;

[0047] Calcium stearate, CAS No. 1592-23-0, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0048] Antioxidant 264, CAS No. 128-37-0, was purchased from Zhongshan Xingrui Chemical Co., Ltd.

[0049] Antioxidant 168, CAS No. 31570-04-4, was purchased from Zhongshan Dixin Chemical Co., Ltd. Example 1

[0050] This embodiment provides a method for preparing corrosion-resistant high-density polyethylene sheets, including the following steps:

[0051] By weight, 60 parts of surface-modified ultra-high molecular weight polyethylene, 60 parts of high-density polyethylene, 20 parts of glass microsphere composite material, 10 parts of calcium carbonate, 6 parts of lubricant silicone powder and 0.4 parts of antioxidant 264 are added to a high-speed mixer. After mixing, the mixture is discharged and then extruded through a screw extruder (at a temperature of 200℃) to obtain corrosion-resistant high-density polyethylene sheets.

[0052] Preparation of the surface-modified ultra-high molecular weight polyethylene: Ultra-high molecular weight polyethylene is washed and dried, and then treated with Co-γ rays in an air atmosphere to obtain pre-irradiated ultra-high molecular weight polyethylene; the pre-irradiated ultra-high molecular weight polyethylene is immersed in a 0.4 mol / L aqueous solution of N,N'-vinylbisacrylamide, placed in a nitrogen atmosphere, and treated at 90°C for 12 h, washed with deionized water, and dried to obtain grafted ultra-high molecular weight polyethylene; the grafted ultra-high molecular weight polyethylene is immersed in an ethanol solution of 0.04 mol / L ethylene glycol maleate acrylate and modified at 95°C for 60 min to obtain surface-modified ultra-high molecular weight polyethylene.

[0053] Preparation of the glass microsphere composite material: By weight, 20 parts of commercially available glass microsphere I (brand name ZMN-149103-20, particle size 5μm) were added to 120 parts of 1.6mol / L sodium hydroxide solution, stirred at 90℃ for 70min, washed with water and dried, and then added to a mixture of 100 parts of anhydrous ethanol and 100 parts of deionized water, followed by 10 parts of silane coupling agent vinyltrimethoxysilane, stirred at 80℃ for 3h, filtered, and dried to obtain silane-coupled glass microspheres; Under a nitrogen atmosphere, 20 parts of silane-coupled glass microspheres were added to 30 parts of epoxy vinyl ester resin, followed by 0.4 parts of benzoyl peroxide, stirred at 80℃ for 2h, centrifuged, and filtered to obtain the glass microsphere composite material. Example 2

[0054] This embodiment provides a method for preparing corrosion-resistant high-density polyethylene sheets, including the following steps:

[0055] By weight, 50 parts of surface-modified ultra-high molecular weight polyethylene, 50 parts of high-density polyethylene, 16 parts of glass microsphere composite material, 6 parts of calcium carbonate, 2 parts of lubricant calcium stearate and 0.2 parts of antioxidant 168 are added to a high-speed mixer. After mixing, the mixture is discharged and then extruded through a screw extruder (at a temperature of 190°C) to obtain corrosion-resistant high-density polyethylene sheets.

[0056] Preparation of the surface-modified ultra-high molecular weight polyethylene: Ultra-high molecular weight polyethylene is washed and dried, and then treated with Co-γ rays in an air atmosphere to obtain pre-irradiated ultra-high molecular weight polyethylene; the pre-irradiated ultra-high molecular weight polyethylene is immersed in a 0.2 mol / L aqueous solution of N,N'-vinylbisacrylamide, placed in a nitrogen atmosphere, and treated at 80°C for 16 h, washed with deionized water, and dried to obtain grafted ultra-high molecular weight polyethylene; the grafted ultra-high molecular weight polyethylene is immersed in an ethanol solution of 0.02 mol / L ethylene glycol maleate acrylate and modified at 85°C for 80 min to obtain surface-modified ultra-high molecular weight polyethylene.

[0057] Preparation of the glass microsphere composite material: By weight, 16 parts of commercially available glass microsphere I (brand name ZMN-149103-20, particle size 5μm) were added to 100 parts of 1.2mol / L sodium hydroxide solution, stirred at 80℃ for 80min, washed with water and dried, then added to a mixture of 90 parts of anhydrous ethanol and 90 parts of deionized water, and then 8 parts of silane coupling agent vinyltrimethoxysilane were added, stirred at 70℃ for 3h, filtered, and dried to obtain silane-coupled glass microspheres; under a nitrogen atmosphere, 16 parts of silane-coupled glass microspheres were added to 20 parts of epoxy vinyl ester resin, then 0.2 parts of benzoyl peroxide were added, stirred at 70℃ for 3h, centrifuged, and filtered to obtain the glass microsphere composite material. Example 3

[0058] This embodiment provides a method for preparing corrosion-resistant high-density polyethylene sheets, including the following steps:

[0059] By weight, 55 parts of surface-modified ultra-high molecular weight polyethylene, 55 parts of high-density polyethylene, 18 parts of glass microsphere composite material, 8 parts of calcium carbonate, 4 parts of lubricant silicone powder and 0.3 parts of antioxidant 264 are added to a high-speed mixer. After mixing, the mixture is discharged and then extruded through a screw extruder (at a temperature of 195°C) to obtain corrosion-resistant high-density polyethylene sheets.

[0060] Preparation of the surface-modified ultra-high molecular weight polyethylene: Ultra-high molecular weight polyethylene is washed and dried, and then treated with Co-γ rays in an air atmosphere to obtain pre-irradiated ultra-high molecular weight polyethylene; the pre-irradiated ultra-high molecular weight polyethylene is immersed in a 0.3 mol / L aqueous solution of N,N'-vinylbisacrylamide, placed in a nitrogen atmosphere, and treated at 85°C for 14 h, washed with deionized water, and dried to obtain grafted ultra-high molecular weight polyethylene; the grafted ultra-high molecular weight polyethylene is immersed in an ethanol solution of 0.03 mol / L ethylene glycol maleate acrylate and modified at 90°C for 70 min to obtain surface-modified ultra-high molecular weight polyethylene.

[0061] Preparation of the glass microsphere composite material: By weight, 18 parts of commercially available glass microspheres I (brand name ZMN-149103-20, particle size 5μm) were added to 110 parts of 1.4mol / L sodium hydroxide solution, stirred at 85℃ for 75min, washed with water and dried, then added to a mixture of 95 parts of anhydrous ethanol and 95 parts of deionized water, and then 9 parts of silane coupling agent vinyltrimethoxysilane were added, stirred at 75℃ for 2.5h, filtered, and dried to obtain silane-coupled glass microspheres; under a nitrogen atmosphere, 18 parts of silane-coupled glass microspheres were added to 25 parts of epoxy vinyl ester resin, then 0.3 parts of benzoyl peroxide were added, stirred at 75℃ for 2.5h, centrifuged, and filtered to obtain the glass microsphere composite material. Example 4

[0062] The difference between this embodiment and Embodiment 1 is that commercially available glass microspheres II (brand name ZMN-149115-50, particle size 90μm) are used instead of commercially available glass microspheres I (brand name ZMN-149103-20, particle size 5μm) to prepare the glass microsphere composite material.

[0063] Comparative Example 1

[0064] The difference between this comparative example and Example 1 is that commercially available ultra-high molecular weight polyethylene (product number P77511) was used instead of surface-modified ultra-high molecular weight polyethylene, and commercially available glass microspheres I (product number ZMN-149103-20) was used instead of glass microsphere composite material.

[0065] Comparative Example 2

[0066] The difference between this comparative example and Comparative Example 1 is that a glass microsphere composite material is used instead of commercially available glass microsphere I (brand name ZMN-149103-20).

[0067] Comparative Example 3

[0068] The difference between this comparative example and Comparative Example 1 is that surface-modified ultra-high molecular weight polyethylene is used instead of commercially available ultra-high molecular weight polyethylene.

[0069] The properties of the plates provided in the above embodiments and comparative examples were tested using the following methods:

[0070] (1) Corrosion resistance test: The samples of the examples and comparative examples were placed in a 1 mol / L hydrochloric acid solution and a 1 mol / L sodium hydroxide solution for 24 h, respectively. The weight loss of the samples was recorded to determine the corrosion resistance of the samples.

[0071] (2) Wear test: The test shall be conducted in accordance with the requirements of GB / T 5478-2008 Test method for rolling wear of plastics.

[0072] The performance test data above are shown in Table 1.

[0073] Table 1 Performance Test Results

[0074]

[0075] As can be seen from the above, the present invention uses ultra-high molecular weight polyethylene and high-density polyethylene as the main raw materials, and performs surface modification treatment on ultra-high molecular weight polyethylene. Combined with glass microsphere composite material with specific particle size, calcium carbonate, lubricant and other components, high-density polyethylene sheets (Examples 1 to 3) are prepared, which have the best comprehensive performance.

[0076] Compared to Example 1, commercially available glass microspheres II (brand name ZMN-149115-50, particle size 90 μm) were used instead of commercially available glass microspheres I (brand name ZMN-149103-20, particle size 5 μm) in the preparation of the glass microsphere composite material. Because the particle size of the commercially available glass microspheres II was too large, the composite effect was poor, resulting in decreased corrosion resistance and reduced wear resistance (Example 4). Compared to Example 1, commercially available ultra-high molecular weight polyethylene (product number P77511) was used instead of surface-modified ultra-high molecular weight polyethylene. When commercially available glass microspheres I (brand name ZMN-149103-20) were used to replace the glass microsphere composite material, the corrosion resistance decreased and the wear resistance was reduced (Comparative Example 1). Compared with Comparative Example 1, when glass microsphere composite material was used to replace commercially available glass microspheres I (brand name ZMN-149103-20), the corrosion resistance improved and the wear resistance was enhanced (Comparative Example 2). Compared with Comparative Example 1, when surface-modified ultra-high molecular weight polyethylene was used to replace commercially available ultra-high molecular weight polyethylene, the corrosion resistance improved and the wear resistance was enhanced (Comparative Example 3).

Claims

1. A corrosion-resistant high-density polyethylene sheet, characterized in that, Based on parts by weight, it includes the following components: 50-60 parts surface-modified ultra-high molecular weight polyethylene, 50-60 parts high-density polyethylene, 16-20 parts glass microsphere composite material, 6-10 parts calcium carbonate, 2-6 parts lubricant and 0.2-0.4 parts antioxidant; The preparation method of the surface-modified ultra-high molecular weight polyethylene includes: first, pre-irradiating ultra-high molecular weight polyethylene to obtain pre-irradiated ultra-high molecular weight polyethylene; then, grafting the pre-irradiated ultra-high molecular weight polyethylene to obtain grafted ultra-high molecular weight polyethylene; and finally, modifying the grafted ultra-high molecular weight polyethylene with maleic rosin ethylene glycol acrylate to obtain surface-modified ultra-high molecular weight polyethylene. The preparation method of the glass microsphere composite material includes: firstly, subjecting commercially available glass microspheres to silane coupling treatment to obtain silane-coupled glass microspheres; then, subjecting the silane-coupled glass microspheres to epoxy vinyl ester resin for composite treatment to obtain the glass microsphere composite material. The grafting process includes: immersing pre-irradiated ultra-high molecular weight polyethylene in a 0.2-0.4 mol / L N,N'-vinylbisacrylamide aqueous solution, placing it under nitrogen atmosphere, treating it at 80-90℃ for 12-16 hours, washing it with deionized water, and drying it to obtain grafted ultra-high molecular weight polyethylene. The commercially available glass microspheres have a particle size of 2~10μm.

2. The corrosion-resistant high-density polyethylene sheet according to claim 1, characterized in that, The modification process includes: immersing the grafted ultra-high molecular weight polyethylene in an ethanol solution of 0.02~0.04 mol / L maleic rosin ethylene glycol acrylate, and modifying it at 85~95℃ for 60~80 min.

3. The corrosion-resistant high-density polyethylene sheet according to claim 2, characterized in that, The structural formula of the ethylene glycol acrylate in maleic rosin is: 。 4. The corrosion-resistant high-density polyethylene sheet according to claim 1, characterized in that, The steps of the silane coupling treatment include: adding 16-20 parts by weight of commercially available glass microspheres to 100-120 parts of a 1.2-1.6 mol / L sodium hydroxide solution, stirring at 80-90°C for 70-80 min, washing with water and drying, then adding to a mixture of 90-100 parts of anhydrous ethanol and 90-100 parts of deionized water, then adding 8-10 parts of the silane coupling agent vinyltrimethoxysilane, stirring at 70-80°C for 2-3 h, filtering, and drying to obtain silane-coupled glass microspheres.

5. The corrosion-resistant high-density polyethylene sheet according to claim 1, characterized in that, The composite treatment steps include: adding 16-20 parts of silane-coupled glass microspheres to 20-30 parts of epoxy vinyl ester resin under a nitrogen atmosphere, then adding 0.2-0.4 parts of benzoyl peroxide, stirring at 70-80°C for 2-3 hours, centrifuging, filtering, and obtaining the glass microsphere composite material.

6. The corrosion-resistant high-density polyethylene sheet according to claim 1, characterized in that, The lubricant is silicone powder or calcium stearate.

7. A method for preparing corrosion-resistant high-density polyethylene sheet as described in any one of claims 1-6, characterized in that, Includes the following steps: By weight, 50-60 parts of surface-modified ultra-high molecular weight polyethylene, 50-60 parts of high-density polyethylene, 16-20 parts of glass microspheres, 6-10 parts of calcium carbonate, 2-6 parts of lubricant and 0.2-0.4 parts of antioxidant are added to a high-speed mixer. After mixing, the mixture is discharged and then extruded through a screw extruder to obtain corrosion-resistant high-density polyethylene sheets.

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