Multi-layer composite pipeline lining with wear resistance and corrosion resistance and preparation method of multi-layer composite pipeline lining

Abstract

The invention discloses a wear-resistant and corrosion-resistant multi-layer composite pipeline lining and a preparation method thereof, and relates to the technical field of pipeline flowmeter lining materials and preparation. The method comprises the step of adopting a multi-layer composite structure of a modified polyurethane buffer layer, a nano reinforced ceramic wear-resistant layer and a Ti-6Al-4V alloy supporting layer. The amino acid surface modified metal organic framework ZIF-67 is used as a nano filler to be dispersed in a polyurethane matrix, so that the thermal stability and the wear resistance of polyurethane are remarkably improved; the nano SiC particles are added into the ceramic matrix to form the ceramic nano composite layer, so that the thermal shock resistance and the fracture toughness of the ceramic are improved; ti-6Al-4V alloy is adopted as the metal supporting layer, so that the strength and corrosion resistance of the whole structure are ensured. The technical problems that a traditional pipeline lining is prone to cracking under thermal shock or mechanical shock, polyurethane is degraded and deformed at high temperature, and the interlayer bonding strength is insufficient are solved, the service life of the pipeline lining is remarkably prolonged, and the reliability of the pipeline lining is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of pipeline flow meter lining materials and preparation technology, specifically to a multi-layer composite pipeline lining with wear and corrosion resistance and its preparation method. Background Technology

[0002] Pipeline lining technology is widely used in fluid transport systems in industries such as petrochemicals, mining and metallurgy, and power generation to improve the wear resistance, corrosion resistance, and service life of pipelines. Traditional pipeline linings primarily use single materials, such as polyurethane or ceramic linings. Polyurethane linings offer good elasticity and cushioning properties, but they are prone to thermal degradation under long-term high-temperature environments, leading to shrinkage and deformation of the lining layer. This not only affects the pipeline's transport efficiency but also adversely impacts the accuracy of measuring equipment such as flow meters. Ceramic linings possess excellent wear and corrosion resistance, but they are brittle and prone to cracking and failure under thermal shock or mechanical impact.

[0003] To comprehensively utilize the advantages of different materials, researchers have developed polyurethane-ceramic composite liners. However, in existing technologies, the interfacial bonding strength between polyurethane and ceramic is insufficient, making delamination prone to occur during use. This leads to a decline in the overall performance of the composite liner and limits its application range.

[0004] Therefore, there is an urgent need to develop a new type of multi-layer composite pipe lining that can fully utilize the performance advantages of each layer of material, ensure the interlayer bonding strength, and improve the overall performance and service life of the lining. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a multi-layer composite pipe liner with wear and corrosion resistance and its preparation method. Through a multi-layer composite structure consisting of a modified polyurethane buffer layer, a nano-reinforced ceramic wear-resistant layer, and a Ti-6Al-4V alloy support layer, the invention solves the technical problems of easy cracking of the pipe liner under thermal shock or mechanical impact, shrinkage and deformation of the liner due to polyurethane degradation under long-term high temperature, and easy delamination due to insufficient bonding strength between polyurethane and ceramic.

[0006] The technical solution of the present invention is as follows: A multi-layer composite pipe liner with wear and corrosion resistance and its preparation method, comprising the following steps: S1: To prepare modified polyurethane, ZIF-67 nanoparticles are modified with amino acids, and then the polyurethane is pretreated. The polyurethane particles are placed in a vacuum drying oven at 60-80℃ and dried for 8-12 hours to remove moisture. The pretreated polyurethane is heated to 180℃ to melt it, and 1-5% of amino acid-modified ZIF-67 by mass of polyurethane is added and stirred evenly to obtain modified polyurethane. Further, the preparation steps of ZIF-67 nanoparticles are as follows: 2.91 g of cobalt nitrate hexahydrate was dissolved in 100 mL of methanol to form solution A; 3.28 g of 2-methylimidazole was dissolved in 100 mL of methanol to form solution B. At room temperature, solution B was rapidly poured into solution A, stirred vigorously for 5 min, and then allowed to stand for 24 h. The purple precipitate was collected by centrifugation, washed three times with methanol, and dried under vacuum at 60 °C for 12 h to obtain ZIF-67 nanoparticles.

[0007] Further, the amino acid modification steps are as follows: 1g of ZIF-67 nanoparticles were dispersed in 200mL of deionized water and sonicated for 30min to form a uniform suspension. 0.15g / L of arginine was added, and the pH was adjusted to 8.0 with NaOH solution. The mixture was magnetically stirred at 70℃ for 5h. After the reaction, the product was separated by centrifugation, washed three times with deionized water, and vacuum dried at 60℃ for 12h to obtain amino acid-modified ZIF-67.

[0008] Furthermore, the stirring parameters are set to a speed of 1000–1500 r / min and a stirring time of 30–60 min.

[0009] S2: To prepare the ceramic nanolayer, alumina ceramic was selected as the ceramic matrix. Alumina ceramic powder was mixed with nano-SiC particles and placed in a ball mill to obtain a mixed powder. The mixed powder was then loaded into a mold and pressed under a pressure of 15–25 MPa to obtain a green body. The green body was then placed in a sintering furnace and sintered at 1200–1600℃ for 2–5 hours to obtain the ceramic nanolayer.

[0010] Furthermore, the amount of SiC added is 2-8% of the mass of the alumina ceramic powder.

[0011] Furthermore, the ball mill parameters are set as follows: ball mill speed of 200-400 r / min, ball-to-material ratio of 5:1-10:1, and time of 1-3 h.

[0012] S3: Treat the metal support layer. Clean the inner surface of the Ti-6Al-4V alloy tube with acetone and ethanol in sequence to remove oil stains. Use 80-mesh white corundum sand to sandblast the inner surface under a pressure of 0.5MPa to roughen the surface. After sandblasting, blow away the residual sand with compressed air and ultrasonically clean for 10 minutes.

[0013] Furthermore, the surface roughness Ra reaches 3-5 μm.

[0014] S4: Composite ceramic mixed casting lining. Modified polyurethane is heated to 180℃ and kept in a molten state, then cast onto the treated Ti-6Al-4V alloy metal support layer to form a polyurethane buffer layer. Then, the prepared ceramic nanolayer is... The mixture is placed on a polyurethane buffer layer and then pressurized and cured to obtain a composite ceramic mixed casting liner. Furthermore, the thickness of the polyurethane buffer layer is 2–4 mm, and the thickness of the ceramic nanolayer is 4–6 mm.

[0015] Furthermore, the pressure curing parameters are: pressure of 5–15 MPa, temperature of 60–100 °C, and curing time of 2–6 h.

[0016] The beneficial effects of this invention are: 1. This invention fully utilizes the performance advantages of each layer material by adopting a multi-layer composite structure design. The modified polyurethane buffer layer provides elastic cushioning, the nano-reinforced ceramic layer provides wear and corrosion resistance, and the Ti-6Al-4V alloy layer provides structural support.

[0017] 2. This invention significantly improves the thermal stability and wear resistance of polyurethane by adding ZIF-67 nanofiller and surface modification, and solves the problems of high-temperature degradation and shrinkage deformation.

[0018] 3. This invention utilizes the addition of nano-SiC to improve the thermal shock resistance of ceramics and effectively reduce the risk of ceramic layer cracking. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties and its preparation method, according to the present invention.

[0020] Figure 2 The thermal shock resistance comparison diagram shows the wear-resistant and corrosion-resistant multilayer composite pipe lining of the present invention and its preparation method under different conditions.

[0021] Figure 3 The graph shows a comparison of the corrosion resistance of the multilayer composite pipe lining with wear and corrosion resistance of the present invention and its preparation method under different conditions.

[0022] Figure 4 The image shows a comparison of the wear resistance of the multilayer composite pipe lining with wear and corrosion resistance of the present invention and its preparation method under different conditions. Detailed Implementation

[0023] The following embodiments further explain and illustrate the technical solution of the present invention. It is particularly noted that each specific embodiment is a concretization and explanation of the technical solution and should not be considered as a limitation on the scope of protection of the present invention. Those skilled in the art still have the right to modify the technical solutions of these embodiments and make equivalent substitutions for some or all of the technical features, and these modifications or substitutions do not change the essence of the corresponding technical solutions, nor do they cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions described in the present invention. (See attached...) Figure 1The diagram shows a flowchart of a multi-layer composite pipe liner with wear and corrosion resistance and its preparation method. The detailed preparation steps are as follows: 1. Preparation of modified polyurethane ZIF-67 nanoparticles were modified with amino acids, and then polyurethane was pretreated. The polyurethane particles were dried in a vacuum drying oven at 60-80℃ for 8-12 hours to remove moisture. The pretreated polyurethane was heated to 180℃ to melt it, and 1-5% of amino acid-modified ZIF-67 by mass of polyurethane was added and stirred evenly to obtain modified polyurethane. The preparation steps of ZIF-67 nanoparticles are as follows: 2.91 g of cobalt nitrate hexahydrate was dissolved in 100 mL of methanol to form solution A; 3.28 g of 2-methylimidazole was dissolved in 100 mL of methanol to form solution B. At room temperature, solution B was quickly poured into solution A, and the mixture was stirred vigorously for 5 min and then allowed to stand for 24 h. The purple precipitate was collected by centrifugation, washed three times with methanol, and dried under vacuum at 60 °C for 12 h to obtain ZIF-67 nanoparticles.

[0024] The amino acid modification steps are as follows: 1g of ZIF-67 nanoparticles were dispersed in 200mL of deionized water and sonicated for 30min to form a uniform suspension. 0.15g / L of arginine was added, and the pH was adjusted to 8.0 with NaOH solution. The mixture was magnetically stirred at 70℃ for 5h. After the reaction, the product was separated by centrifugation, washed three times with deionized water, and vacuum dried at 60℃ for 12h to obtain amino acid-modified ZIF-67.

[0025] The stirring parameters are set to a speed of 1000-1500 r / min and a stirring time of 30-60 min.

[0026] 2. Preparation of ceramic nanolayers Alumina ceramic was selected as the ceramic matrix. Alumina ceramic powder was mixed with nano-SiC particles and placed in a ball mill to obtain a mixed powder. The mixed powder was then loaded into a mold and pressed under a pressure of 15–25 MPa to obtain a green body. The green body was then placed in a sintering furnace and sintered at 1200–1600℃ for 2–5 hours to obtain a ceramic nanolayer.

[0027] The SiC addition amount is 2-8% of the mass of the alumina ceramic powder.

[0028] The mill parameters were set as follows: ball mill speed 200-400 r / min, ball-to-material ratio 5:1-10:1, and time 1-3 h.

[0029] 3. Treatment of the metal support layer The inner surface of the Ti-6Al-4V alloy tube was cleaned with acetone and ethanol in sequence to remove oil stains. The inner surface was then sandblasted with 80-mesh white corundum sand at a pressure of 0.5 MPa to roughen the surface. After sandblasting, the residual sand was blown away with compressed air and ultrasonically cleaned for 10 minutes.

[0030] The surface roughness Ra reaches 3-5 μm.

[0031] 4. Composite ceramic mixed casting lining The modified polyurethane was heated to 180°C and kept in a molten state. It was then poured onto the treated Ti-6Al-4V alloy metal support layer to form a polyurethane buffer layer. The prepared ceramic nanolayer was then placed on the polyurethane buffer layer and pressure-cured to obtain a composite ceramic mixed casting liner. The thickness of the polyurethane buffer layer is 2-4 mm, and the thickness of the ceramic nanolayer is 4-6 mm.

[0032] The pressure curing parameters are: pressure 5-15 MPa, temperature 60-100℃, and curing time 2-6 h.

[0033] Example 1 A multi-layer composite pipe liner with wear and corrosion resistance and its preparation method are disclosed below. The detailed preparation steps are as follows: S1: To prepare modified polyurethane, ZIF-67 nanoparticles were modified with amino acids, and then the polyurethane was pretreated. The polyurethane particles were dried in a vacuum drying oven at 70℃ for 10h to remove moisture. The pretreated polyurethane was heated to 180℃ to melt it. 3% of the mass of amino acid-modified ZIF-67 was added, and the mixture was stirred at 1200r / min for 45min until it was homogeneous, thus obtaining the modified polyurethane. The preparation steps of ZIF-67 nanoparticles are as follows: 2.91 g of cobalt nitrate hexahydrate was dissolved in 100 mL of methanol to form solution A; 3.28 g of 2-methylimidazole was dissolved in 100 mL of methanol to form solution B. At room temperature, solution B was quickly poured into solution A, and the mixture was stirred vigorously for 5 min and then allowed to stand for 24 h. The purple precipitate was collected by centrifugation, washed three times with methanol, and dried under vacuum at 60 °C for 12 h to obtain ZIF-67 nanoparticles.

[0034] The amino acid modification steps are as follows: 1g of ZIF-67 nanoparticles were dispersed in 200mL of deionized water and sonicated for 30min to form a uniform suspension. 0.15g / L of arginine was added, and the pH was adjusted to 8.0 with NaOH solution. The mixture was magnetically stirred at 70℃ for 5h. After the reaction, the product was separated by centrifugation, washed three times with deionized water, and vacuum dried at 60℃ for 12h to obtain amino acid-modified ZIF-67.

[0035] S2: To prepare the ceramic nanolayer, alumina ceramic was selected as the ceramic matrix. Alumina ceramic powder was mixed with nano-SiC particles and placed in a ball mill to obtain a mixed powder. The mixed powder was then loaded into a mold and pressed under a pressure of 20 MPa to obtain a green blank. The green blank was placed in a sintering furnace and sintered at 1400℃ for 2.5 h to obtain the ceramic nanolayer.

[0036] The SiC addition amount is 5% of the mass of the alumina ceramic powder.

[0037] The ball mill parameters were set as follows: ball mill speed 300 r / min, ball-to-material ratio 8:1, and time 2 h.

[0038] S3: Treat the metal support layer. Clean the inner surface of the Ti-6Al-4V alloy tube with acetone and ethanol in sequence to remove oil stains. Use 80-mesh white corundum sand to sandblast the inner surface under a pressure of 0.5MPa to achieve a surface roughness of Ra of 3-5μm. After sandblasting, blow away the residual sand with compressed air and ultrasonically clean for 10 minutes.

[0039] S4: Composite ceramic mixed casting liner, the modified polyurethane is heated to 180℃ and kept in a molten state, and then cast onto the treated Ti-6Al-4V alloy metal support layer to form a polyurethane buffer layer. Then the prepared ceramic nanolayer is placed on the polyurethane buffer layer and pressure cured to obtain the composite ceramic mixed casting liner. The polyurethane buffer layer is 3mm thick, and the ceramic nanolayer is 5mm thick.

[0040] The pressure curing parameters were 10 MPa, 80°C, and 4 hours.

[0041] Example 2 A multi-layer composite pipe liner with wear and corrosion resistance and its preparation method are disclosed below. The detailed preparation steps are as follows: The wear-resistant and corrosion-resistant multilayer composite pipe lining and its preparation method are described in Example 1, but the difference lies in the following: in step S1 of the preparation process, the drying temperature of the polyurethane particles is 80°C, the drying time is 12 hours, the amount of ZIF-67 added is 5% of the mass of the polyurethane, the stirring speed is 1500 r / min, and the stirring time is 60 minutes.

[0042] In step S2 of the preparation process, the SiC addition amount is 8% of the mass of silicon carbide ceramic powder, the ball milling speed is 400 r / min, the ball-to-material ratio is 10:1, the ball milling time is 3 h, the molding pressure is 25 MPa, the sintering temperature is 1600 ℃, and the sintering time is 2 h.

[0043] In step S4 of the preparation process, the polyurethane buffer layer is 4 mm thick, the ceramic nanolayer is 6 mm thick, the pressure is 15 MPa, the curing temperature is 100℃, and the curing time is 6 h.

[0044] Example 3 A multi-layer composite pipe liner with wear and corrosion resistance and its preparation method are disclosed below. The detailed preparation steps are as follows: The wear-resistant and corrosion-resistant multilayer composite pipe lining and its preparation method are described in Example 1, but the difference lies in the following: in step S1 of the preparation process, the drying temperature of the polyurethane particles is 65°C, the drying time is 9 hours, the amount of ZIF-67 added is 2% of the mass of the polyurethane, the stirring speed is 1100 r / min, and the stirring time is 40 minutes.

[0045] In step S2 of the preparation process, the SiC addition amount is 3% of the mass of silicon carbide ceramic powder, the ball milling speed is 250 r / min, the ball-to-material ratio is 6:1, the ball milling time is 1.5 h, the molding pressure is 18 MPa, the sintering temperature is 1300 ℃, and the sintering time is 5 h.

[0046] In step S4 of the preparation process, the polyurethane buffer layer is 2.5 mm thick, the ceramic nanolayer is 4.5 mm thick, the pressure is 8 MPa, the curing temperature is 70 °C, and the curing time is 3 h.

[0047] Example 4 A multi-layer composite pipe liner with wear and corrosion resistance and its preparation method are disclosed below. The detailed preparation steps are as follows: The method for preparing a multi-layer composite pipe liner with wear and corrosion resistance according to Example 1 differs in that, in step S1 of the preparation process, the drying temperature of the polyurethane particles is 75°C, the drying time is 11 hours, the amount of ZIF-67 added is 4% of the mass of the polyurethane, the stirring speed is 1500 r / min, and the stirring time is 50 minutes.

[0048] In step S2 of the preparation process, the SiC addition amount is 7% of the mass of silicon carbide ceramic powder, the ball milling speed is 350 r / min, the ball-to-material ratio is 9:1, the ball milling time is 2.5 h, the molding pressure is 22 MPa, the sintering temperature is 1500 ℃, and the sintering time is 4 h.

[0049] In step S4 of the preparation process, the polyurethane buffer layer is 3.5 mm thick, the ceramic nanolayer is 5.5 mm thick, the pressure is 12 MPa, the curing temperature is 90℃, and the curing time is 5 h.

[0050] Comparative Example 1 This paper describes a multi-layer composite pipe liner with wear and corrosion resistance, and its preparation method, as described in Example 1. However, the liner does not employ a multi-layer structure consisting of a polyurethane buffer layer, a ceramic wear-resistant layer, and a metal support layer; instead, it uses only a single polyurethane layer. All other steps are the same.

[0051] Comparative Example 2 This paper describes a multi-layer composite pipe liner with wear and corrosion resistance, and its preparation method, based on Example 1, but using ZIF-67 without amino acid surface modification in the modified polyurethane. All other steps are the same.

[0052] Comparative Example 3 This paper describes a multilayer composite pipe liner with wear and corrosion resistance, and its preparation method, based on Example 1, but without the addition of nano-SiC particles to the ceramic nanolayer. All other steps are the same.

[0053] This paper compares the wear-resistant and corrosion-resistant multilayer composite pipe lining and its preparation method based on Examples 1-3 and Comparative Examples 1-3. The corrosion resistance was tested according to standard GB / T 10125-2021 "Artificial Atmosphere Corrosion Test - Salt Spray Test"; the thermal shock resistance was tested according to standard GB / T 3298-2022 "Method for Determining Thermal Shock Resistance of Daily-Use Ceramics"; and the wear resistance was tested according to standard ASTM D4060 "Standard Test Method for Determining the Abrasion Resistance of Organic Coatings by Taber Abrasion". Specific test comparison results are shown in Table 1 and Appendix. Figure 2 Appendix Figure 3 Appendix Figure 4 As shown: Table 1. Comparison of overall performance between Examples 1-4 and Comparative Examples 1-3 As can be seen from the above comparison results, in Comparative Example 1, a multi-layer structure of "polyurethane buffer layer, ceramic wear-resistant layer, and metal support layer" was not used. In a multi-layer structure, the modified polyurethane buffer layer provides elastic cushioning, the nano-reinforced ceramic layer provides wear and corrosion resistance, and the Ti-6Al-4V alloy layer provides structural support. If only a single polyurethane layer is used, it will affect thermal shock resistance, corrosion resistance, and wear resistance. In Comparative Example 2, ZIF-67 without amino acid surface modification was used, resulting in poor interfacial compatibility with polyurethane and low interfacial bonding strength, leading to poor thermal shock resistance, corrosion resistance, and wear resistance. In Comparative Example 3, no nano-SiC particles were added to the ceramic nanolayer, resulting in poor thermal shock resistance. This is because nano-SiC improves the fracture toughness of the ceramic through crack deflection, bridging, and pull-out mechanisms, thereby improving thermal shock resistance.

Claims

1. The method for preparing a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties according to claim 1, characterized in that, Includes the following steps: S1: Modify ZIF-67 nanoparticles with amino acids, then pretreat polyurethane, place polyurethane particles in a vacuum drying oven at 60-80℃ for 8-12 hours to remove moisture, heat the pretreated polyurethane to 180℃ to melt it, add 1-5% of amino acid-modified ZIF-67 by mass of polyurethane, and stir evenly to obtain modified polyurethane. S2: Alumina ceramic is selected as the ceramic matrix. Alumina ceramic powder is mixed with nano SiC particles and placed in a ball mill to process into mixed powder. The mixed powder is loaded into a mold and pressed into shape under a pressure of 15-25 MPa to obtain a green blank. The green blank is placed in a sintering furnace and sintered at 1200-1600℃ for 2-5 hours to obtain a ceramic nanolayer. S3: Process the metal support layer. Clean the inner surface of the Ti-6Al-4V alloy tube with acetone and ethanol in sequence to remove oil stains. Use 80-mesh white corundum sand to sandblast the inner surface under a pressure of 0.5MPa to roughen the surface. After sandblasting, blow away the residual sand with compressed air and ultrasonically clean for 10 minutes. S4: Composite ceramic mixed casting liner. Modified polyurethane is heated to 180℃ and kept in a molten state. It is then poured onto the treated Ti-6Al-4V alloy metal support layer to form a polyurethane buffer layer. The prepared ceramic nanolayer is then placed on the polyurethane buffer layer and pressure-cured to obtain the composite ceramic mixed casting liner.

2. The method for preparing a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties according to claim 1, characterized in that, The ZIF-67 nanoparticles described in S1 are prepared by the following steps: Cobalt nitrate hexahydrate is dissolved in methanol to form solution A; 2-methylimidazole is dissolved in methanol to form solution B. At room temperature, solution B is quickly poured into solution A, stirred vigorously for 5 minutes, and then allowed to stand for 24 hours. The purple precipitate is collected by centrifugation, washed three times with methanol, and dried under vacuum at 60°C for 12 hours to obtain ZIF-67 nanoparticles.

3. The method for preparing a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties according to claim 1, characterized in that, The amino acid modification described in S1 is carried out as follows: ZIF-67 nanoparticles are dispersed in deionized water and sonicated for 30 min to form a uniform suspension. Arginine is added, and the pH is adjusted to 8.0 with NaOH solution. The mixture is then magnetically stirred at 70°C for 5 h. After the reaction is completed, the product is separated by centrifugation, washed three times with deionized water, and vacuum dried at 60°C for 12 h to obtain amino acid-modified ZIF-67.

4. The method for preparing a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties according to claim 1, characterized in that, The stirring parameters described in S1 are set to a rotation speed of 1000-1500 r / min and a stirring time of 30-60 min.

5. The method for preparing a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties according to claim 1, characterized in that, The nano-SiC particles described in S2 are mixed in an amount of 2 to 8% of the mass of the alumina ceramic powder.

6. The method for preparing a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties according to claim 1, characterized in that, The ball mill described in S2 has the following parameters: ball mill speed of 200-400 r / min, ball-to-material ratio of 5:1-10:1, and time of 1-3 h.

7. The method for preparing a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties according to claim 1, characterized in that, The surface roughness described in S3 reaches 3 to 5 μm.

8. The method for preparing a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties according to claim 1, characterized in that, The polyurethane buffer layer and ceramic nanolayer described in S5 have thicknesses of 2-4 mm and 4-6 mm, respectively.

9. The method for preparing a multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties according to claim 1, characterized in that, The pressure curing described in S6 is set at a pressure of 5-15 MPa, a temperature of 60-100°C, and a curing time of 2-6 hours.

10. A multi-layer composite pipe liner with wear-resistant and corrosion-resistant properties prepared by the preparation method according to any one of claims 1-9, characterized in that, The multi-layer composite pipe lining can withstand more than 34 thermal shock cycles, with a mass loss rate of less than 0.7% / 1000h and a wear amount of less than 5mg.

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