Wear-resistant seamless steel tube and preparation method thereof

Abstract

The invention relates to a wear-resistant seamless steel pipe and a preparation method thereof, and relates to the technical field of seamless steel pipes. The wear-resistant seamless steel pipe comprises a seamless steel pipe body, a wear-resistant layer is arranged on the side wall of the seamless steel pipe body, the wear-resistant layer is formed by curing a wear-resistant coating, the wear-resistant coating comprises 45-53 parts of epoxy resin, 33-40 parts of a reinforcing agent, 10-14 parts of an aromatic amine curing agent, 3-6 parts of an organic silicon defoaming agent and 28-34 parts of acetone, and the reinforcing agent comprises basalt scales. The effect of improving the wear resistance of the seamless steel pipe is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of seamless steel pipes, and in particular to a wear-resistant seamless steel pipe and a preparation method thereof. Background Art

[0002] Wear-resistant seamless pipes are not only widely used in the transportation of severely worn mine filling materials, mineral concentrates and tailings, but are also used in coal-fired power plants for powder delivery, slag removal, and ash transportation.

[0003] Since the conveying medium generally has the characteristics of high hardness, fast flow rate and large flow rate, and it continuously produces impact, wear and corrosion on the pipe wall for a long time during the transportation process, the seamless steel pipe will become fatigued and gradually worn through, which can easily lead to a decrease in the service life of the seamless steel pipe. Summary of the Invention

[0004] In order to improve the wear resistance of seamless steel pipes and extend the service life of seamless steel pipes, the present application provides a wear-resistant seamless steel pipe and a preparation method thereof.

[0005] In the first aspect, the present application provides a wear-resistant seamless steel pipe, which adopts the following technical solution: A wear-resistant seamless steel pipe comprises a seamless steel pipe body, wherein the side wall of the seamless steel pipe body is provided with a wear-resistant layer, wherein the wear-resistant layer is formed by curing a wear-resistant coating, wherein the wear-resistant coating comprises 45-53 parts of epoxy resin, 33-40 parts of a reinforcing agent, 10-14 parts of an aromatic amine curing agent, 3-6 parts of an organosilicon defoaming agent, and 28-34 parts of acetone, and the reinforcing agent comprises basalt flakes.

[0006] By adopting the above technical solution, basalt flakes have the characteristics of high strength and wear resistance. Therefore, basalt flakes are added to the coating. With the help of the mutual combination of epoxy resin and basalt flakes, the wear resistance of the wear-resistant coating is effectively improved, thereby improving the wear resistance of the seamless steel pipe, and then increasing the service life of the seamless steel pipe.

[0007] In addition, adding aromatic amine curing agents and effective silicon defoaming agents as additives to the coating effectively improves the stability of the wear-resistant layer on the surface of the seamless steel pipe body, thereby having a positive effect on improving the wear resistance of the seamless steel pipe.

[0008] Preferably, the reinforcing agent includes silicon nitride powder.

[0009] By adopting the above technical solution, silicon nitride micropowder has the characteristics of high hardness and good chemical stability. Therefore, when silicon nitride micropowder is added to the wear-resistant coating, it has a good enhancing effect on the wear resistance of the coating. In addition, when basalt flakes and silicon nitride micropowder are mixed as a reinforcing agent and added to the wear-resistant coating, due to the small size of the silicon nitride micropowder, the silicon nitride micropowder can easily enter the cracks and holes of the basalt flakes, thereby effectively improving the stability of the silicon nitride micropowder in the coating.

[0010] Preferably, the mass ratio of the basalt flakes to the silicon nitride powder is 1:(0.62-0.86).

[0011] By adopting the above technical solution, the mass ratio of basalt flakes and silicon nitride micropowder is controlled within the above range, which can effectively improve the interaction between basalt flakes and silicon nitride micropowder, and further enhance the positive effect of adding the reinforcing agent to the wear-resistant coating on improving the wear resistance.

[0012] Preferably, the modification and preparation method of the basalt flakes comprises the following steps: S1, adding carbon nanotubes to a mixture of concentrated nitric acid and concentrated sulfuric acid to react, and after the reaction is complete, washing, filtering, and drying are performed in sequence to obtain passivated carbon nanotubes; S2, adding KH-560 to a mixture of deionized water and ethanol, adjusting the pH to 4 with acetic acid, and obtaining a KH-560 hydrolyzate; adding basalt flakes to a xylene solution, stirring evenly, and then adding the KH-560 hydrolyzate to react. After the reaction is completed, pretreated basalt flakes are obtained; S3. Add the passivated carbon nanotubes into deionized water and stir thoroughly to obtain a carbon nanotube dispersion; add the pretreated basalt flakes into an acetone solution and stir thoroughly, then add the carbon nanotube dispersion and stir evenly, centrifuge, wash and dry in sequence to obtain a modified basalt flake.

[0013] The above technical solution can lead to uneven dispersion of the basalt flakes within the epoxy resin matrix due to the different interfacial properties between the basalt flakes and the epoxy resin. Therefore, the basalt flakes are treated with carbon nanotubes, which are first passivated with a mixed acid. This not only increases the carbon nanotubes' roughness but also forms hydroxyl groups on their surfaces, enhancing the binding activity between the carbon nanotubes and the basalt flakes. KH-560 treatment of the basalt flakes improves the stability of the carbon nanotubes attached to them after the mixed acid treatment.

[0014] The carbon nanoparticles treated with mixed acid act as physical cross-linking points between basalt flakes and epoxy resin, thereby significantly improving the interfacial compatibility between basalt flakes and epoxy resin, and improving the stability of basalt flakes in wear-resistant coatings, thereby improving the wear resistance of seamless steel pipes.

[0015] Preferably, the mass ratio of the basalt flakes to the carbon nanotubes is 1:(0.14-0.22).

[0016] By adopting the above technical solution, the mass ratio of basalt flakes and carbon nanotubes is controlled within the above range, which has a positive effect on improving the interface compatibility between basalt flakes and epoxy resin.

[0017] Preferably, the modification and preparation method of carbon nanotubes comprises the following steps: P1. Add carbon nanotubes to a sulfuric acid solution, stir evenly, then add potassium permanganate, stir thoroughly, filter, wash, and dry to obtain carboxylated carbon nanotubes; P2. Add polyethyleneimine to deionized water, then add carboxylated carbon nanotubes to prepare a carbon nanotube dispersion, and then reflux, filter, wash, and dry in sequence to obtain modified carbon nanotubes. By adopting the above technical solution, polyvinyleneamine is a flexible polymer with a three-dimensional branch structure, which is rich in primary and secondary amino groups. The polyvinyleneamine is grafted onto the carboxylated carbon nanotubes through an amidation reaction, and the amino groups in the polyvinyleneamine undergo an amidation reaction with the carboxyl groups on the carboxylated carbon nanotubes to form amide bonds. The branched polymer polyethyleneimine grafted onto the surface of the carbon nanotubes can effectively improve the dispersion effect of the multiple carbon nanotubes in the epoxy resin, and can participate in a part of the curing and cross-linking reaction, thereby improving the interfacial bonding between the carbon nanotubes and the epoxy resin matrix.

[0018] Preferably, the mass ratio of the carbon nanotubes to polyethyleneimine is 1:(0.35-0.55).

[0019] By adopting the above technical solution, the mass ratio of carbon nanotubes to polyethyleneimine is controlled within the above range, which has a promoting effect on the dispersibility of carbon nanotubes in epoxy resin.

[0020] Preferably, the aromatic amine curing agent is m-phenylenediamine, and the organosilicon defoaming agent is silicone oil.

[0021] In a second aspect, the present application provides a method for preparing a wear-resistant seamless steel pipe as in the first aspect, which adopts the following technical solution: A method for preparing a wear-resistant seamless steel pipe comprises the following steps: S100, mixing epoxy resin, reinforcing agent, aromatic amine curing agent, silicone defoaming agent, and acetone, stirring evenly, and then allowing to stand to prepare a wear-resistant coating; S200, coating the wear-resistant coating on the surface of the seamless steel pipe body, and then curing the coating to obtain the seamless steel pipe.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Basalt flakes have the characteristics of high strength and wear resistance. Therefore, basalt flakes are added to the coating. With the help of the mutual combination of epoxy resin and basalt flakes, the wear resistance of the wear-resistant coating is effectively improved, thereby improving the wear resistance of the seamless steel pipe.

[0023] 2. Due to the different interfacial properties between basalt flakes and epoxy resin, the basalt flakes can easily become unevenly dispersed within the epoxy resin matrix. Therefore, the basalt flakes are treated with carbon nanotubes, which are first passivated with a mixed acid. This not only increases the carbon nanotubes' roughness but also forms hydroxyl groups on the carbon nanotubes' surface, enhancing the binding activity between the carbon nanotubes and the basalt flakes. KH-560 treatment of the basalt flakes improves the stability of the mixed acid-treated carbon nanotubes attached to them. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of a wear-resistant seamless steel pipe in an embodiment of the present application.

[0025] Description of reference numerals: 1. Seamless steel pipe body; 2. Wear-resistant layer. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 This application is described in further detail.

[0027] The embodiment of the present application discloses a wear-resistant seamless steel pipe. Figure 1 The wear-resistant seamless steel pipe includes a seamless steel pipe body 1, and the side wall of the seamless steel pipe body is provided with a wear-resistant layer 2, and the wear-resistant layer 2 is formed by curing the wear-resistant coating.

[0028] The raw materials involved in this application can all be obtained commercially, among which epoxy resin (CAS number: 24969-06-0) is provided by Jinan Chuangshi Chemical Co., Ltd., basalt flakes (CAS number: 7782-42-5) are provided by Shanghai Yuanye Biotechnology Co., Ltd., silicon nitride micropowder (CAS number: 12033-89-5) is provided by Forsman Technology (Beijing) Co., Ltd., carbon nanotubes (CAS number: 308068-56-6) are provided by Shanghai Liantian Materials Technology Co., Ltd., and polyethyleneimine (CAS number: 9002-98-6) is provided by Shanghai Hanluo New Materials Co., Ltd.

[0029] Example 1 The wear-resistant coating includes the following raw materials: 49g of epoxy resin, 37g of reinforcing agent, 12g of aromatic amine curing agent, 5g of silicone defoaming agent, and 31g of acetone.

[0030] The reinforcing agent is basalt flakes, the aromatic amine curing agent is m-phenylenediamine, and the silicone defoaming agent is silicone oil.

[0031] The preparation method of the wear-resistant seamless steel pipe comprises the following steps: S100, mixing epoxy resin, reinforcing agent, aromatic amine curing agent, silicone defoaming agent, and acetone, stirring evenly for 20 minutes, and then letting it stand for 20 minutes to prepare a wear-resistant coating; S200: Apply the wear-resistant coating on the surface of the seamless steel pipe body, dry it at 20°C for 72 hours, and obtain the seamless steel pipe.

[0032] Example 2 The wear-resistant coating includes the following raw materials: 49g of epoxy resin, 37g of reinforcing agent, 12g of aromatic amine curing agent, 5g of silicone defoaming agent, and 31g of acetone.

[0033] The reinforcing agents are basalt flakes and silicon nitride micropowder, the mass ratio of basalt flakes to silicon nitride micropowder is 1:0.74, the aromatic amine curing agent is m-phenylenediamine, and the silicone defoaming agent is silicone oil.

[0034] The preparation method of the enhancer comprises the following steps: The reinforcing agent is prepared by mixing basalt flakes and silicon nitride micropowder and stirring them evenly.

[0035] The preparation method of the wear-resistant seamless steel pipe comprises the following steps: S100, mixing epoxy resin, reinforcing agent, aromatic amine curing agent, silicone defoaming agent, and acetone, stirring evenly for 20 minutes, and then letting it stand for 20 minutes to prepare a wear-resistant coating; S200: Apply the wear-resistant coating on the surface of the seamless steel pipe body, dry it at 20°C for 72 hours, and obtain the seamless steel pipe.

[0036] Example 3 The wear-resistant coating includes the following raw materials: 45g of epoxy resin, 33g of reinforcing agent, 10g of aromatic amine curing agent, 3g of silicone defoaming agent, and 28g of acetone.

[0037] The reinforcing agents include basalt flakes and silicon nitride micropowder, and the mass ratio of basalt flakes to silicon nitride micropowder is 1:0.62.

[0038] The preparation method of the wear-resistant seamless steel pipe comprises the following steps: S100, mixing epoxy resin, reinforcing agent, aromatic amine curing agent, silicone defoaming agent, and acetone, stirring evenly for 20 minutes, and then letting it stand for 20 minutes to prepare a wear-resistant coating; S200: Apply the wear-resistant coating on the surface of the seamless steel pipe body, dry it at 20°C for 72 hours, and obtain the seamless steel pipe.

[0039] Example 4 The wear-resistant coating includes the following raw materials: 53g of epoxy resin, 40g of reinforcing agent, 14g of aromatic amine curing agent, 6g of silicone defoaming agent, and 34g of acetone.

[0040] The reinforcing agents include basalt flakes and silicon nitride micropowder, and the mass ratio of basalt flakes to silicon nitride micropowder is 1:0.86.

[0041] The preparation method of the wear-resistant seamless steel pipe comprises the following steps: S100, mixing epoxy resin, reinforcing agent, aromatic amine curing agent, silicone defoaming agent, and acetone, stirring evenly for 20 minutes, and then letting it stand for 20 minutes to prepare a wear-resistant coating; S200: Apply the wear-resistant coating on the surface of the seamless steel pipe body, dry it at 20°C for 72 hours, and obtain the seamless steel pipe.

[0042] Example 5 The difference between Example 5 and Example 2 is that the mass ratio of basalt flakes to silicon nitride powder is 1:0.52.

[0043] Example 6 The difference between Example 6 and Example 2 is that the mass ratio of basalt flakes to silicon nitride powder is 1:0.96.

[0044] Example 7 The difference between Example 7 and Example 2 is that the modification preparation method of basalt flakes includes the following steps: S1. Add 1.8 g of carbon nanotubes to a mixture of 100 mL of concentrated nitric acid and concentrated sulfuric acid (concentrated nitric acid: concentrated sulfuric acid = 1:3), place the mixture in an ultrasonic oscillator for ultrasonic oscillation, and react in a 60°C water bath for 3 hours. After the reaction, rinse the carbon nanotubes repeatedly with deionized water until the pH of the solution reaches 7, then wash them with acetone 5 times, and finally filter them through a microporous filter membrane under reduced pressure and dry them at 80°C for 24 hours to obtain passivated carbon nanotubes. S2. 5 g of KH-560 was added to 50 mL of a mixture of deionized water and ethanol (deionized water: ethanol = 1:4), the pH value was adjusted to 4 with acetic acid, and the mixture was stirred for 120 min to obtain a KH-560 hydrolyzate; 10 g of basalt flakes were dispersed in 250 mL of a xylene solution by magnetic stirring, and the KH-560 hydrolyzate was added, and the mixture was reacted at 80 ° C for 3 h and at 110 ° C for 1 h under magnetic stirring. Finally, the reaction product was washed with ethanol 3 times and dried at 110 ° C to obtain a pretreated basalt flake; S3. The passivated carbon nanotubes were magnetically stirred for 90 minutes, ultrasonicated for 30 minutes, and then added into 50 mL of deionized water to prepare a carbon nanotube dispersion; the pretreated basalt flakes were added into 50 mL of acetone solution and magnetically stirred for 30 minutes, and then the carbon nanotube dispersion was added and magnetically stirred for 60 minutes. After centrifugation, ethanol washing and drying at 110°C, modified basalt flakes were obtained.

[0045] Example 8 The difference between Example 8 and Example 2 is that the modification preparation method of basalt flakes includes the following steps: S1. Add 1.4 g of carbon nanotubes to a mixture of 100 mL of concentrated nitric acid and concentrated sulfuric acid (concentrated nitric acid: concentrated sulfuric acid = 1:3), place the mixture in an ultrasonic oscillator for ultrasonic oscillation, and react in a 60°C water bath for 3 hours. After the reaction, rinse the carbon nanotubes repeatedly with deionized water until the pH of the solution reaches 7, then wash them with acetone 5 times, and finally filter them through a microporous filter membrane under reduced pressure and dry them at 80°C for 24 hours to obtain passivated carbon nanotubes. S2. 5 g of KH-560 was added to 50 mL of a mixture of deionized water and ethanol (deionized water: ethanol = 1:4), the pH value was adjusted to 4 with acetic acid, and the mixture was stirred for 120 min to obtain a KH-560 hydrolyzate; 10 g of basalt flakes were dispersed in 250 mL of a xylene solution by magnetic stirring, and the KH-560 hydrolyzate was added, and the mixture was reacted at 80 ° C for 3 h and at 110 ° C for 1 h under magnetic stirring. Finally, the reaction product was washed with ethanol 3 times and dried at 110 ° C to obtain a pretreated basalt flake; S3. The passivated carbon nanotubes were magnetically stirred for 90 minutes, ultrasonicated for 30 minutes, and then added into 50 mL of deionized water to prepare a carbon nanotube dispersion; the pretreated basalt flakes were added into 50 mL of acetone solution and magnetically stirred for 30 minutes, and then the carbon nanotube dispersion was added and magnetically stirred for 60 minutes. After centrifugation, ethanol washing and drying at 110°C, modified basalt flakes were obtained.

[0046] Example 9 The difference between Example 9 and Example 2 is that the modification preparation method of basalt flakes includes the following steps: S1. Add 2.2 g of carbon nanotubes to a mixture of 100 mL of concentrated nitric acid and concentrated sulfuric acid (concentrated nitric acid: concentrated sulfuric acid = 1:3), place the mixture in an ultrasonic oscillator for ultrasonic oscillation, and react in a 60°C water bath for 3 hours. After the reaction, rinse the carbon nanotubes repeatedly with deionized water until the pH of the solution reaches 7, then wash them with acetone 5 times, and finally filter them through a microporous filter membrane under reduced pressure and dry them at 80°C for 24 hours to obtain passivated carbon nanotubes. S2. 5 g of KH-560 was added to 50 mL of a mixture of deionized water and ethanol (deionized water: ethanol = 1:4), the pH value was adjusted to 4 with acetic acid, and the mixture was stirred for 120 min to obtain a KH-560 hydrolyzate; 10 g of basalt flakes were dispersed in 250 mL of a xylene solution by magnetic stirring, and the KH-560 hydrolyzate was added, and the mixture was reacted at 80 ° C for 3 h and at 110 ° C for 1 h under magnetic stirring. Finally, the reaction product was washed with ethanol 3 times and dried at 110 ° C to obtain a pretreated basalt flake; S3. The passivated carbon nanotubes were magnetically stirred for 90 minutes, ultrasonicated for 30 minutes, and then added into 50 mL of deionized water to prepare a carbon nanotube dispersion; the pretreated basalt flakes were added into 50 mL of acetone solution and magnetically stirred for 30 minutes, and then the carbon nanotube dispersion was added and magnetically stirred for 60 minutes. After centrifugation, ethanol washing and drying at 110°C, modified basalt flakes were obtained.

[0047] Example 10 The difference between Example 10 and Example 7 is that the mass ratio of basalt flakes to carbon nanotubes is 1:0.04.

[0048] Example 11 The difference between Example 11 and Example 7 is that the mass ratio of basalt flakes to carbon nanotubes is 1:0.32.

[0049] Example 12 The difference between Example 12 and Example 7 is that the modification preparation method of carbon nanotubes includes the following steps: P1. Add 10 g of carbon nanotubes to 100 mL of sulfuric acid solution (the mass concentration of the sulfuric acid solution is 6 mol / L), ultrasonicate for 4 h, then add 1.2 g of potassium permanganate, stir thoroughly, filter, dilute with deionized water, and add oxalic acid or sodium hydroxide for neutralization. Finally, dry in an oven at 100 ° C for 12 h to obtain carboxylated carbon nanotubes; P2. Add 4.5 g of polyethyleneimine to 50 mL of deionized water, then add carboxylated carbon nanotubes to prepare a carbon nanotube dispersion, which is placed in an oil bath and condensed and refluxed at 120°C for 12 hours; obtain the product above the filter paper by vacuum filtration, wash it five times with deionized water, and then place it in a vacuum freeze dryer for freeze-drying to obtain modified carbon nanotubes.

[0050] Example 13 The difference between Example 13 and Example 7 is that the modification preparation method of carbon nanotubes includes the following steps: P1. Add 10 g of carbon nanotubes to 100 mL of sulfuric acid solution (the mass concentration of the sulfuric acid solution is 6 mol / L), ultrasonicate for 4 h, then add 1.2 g of potassium permanganate, stir thoroughly, filter, dilute with deionized water, and add oxalic acid or sodium hydroxide for neutralization. Finally, dry in an oven at 100 ° C for 12 h to obtain carboxylated carbon nanotubes; P2. Add 3.5 g of polyethyleneimine to 50 mL of deionized water, then add carboxylated carbon nanotubes to prepare a carbon nanotube dispersion, place it in an oil bath, and condense and reflux at 120°C for 12 hours; obtain the product above the filter paper by vacuum filtration, wash it five times with deionized water, and then place it in a vacuum freeze dryer for freeze drying to obtain modified carbon nanotubes.

[0051] Example 14 The difference between Example 14 and Example 7 is that the modification preparation method of carbon nanotubes includes the following steps: P1. Add 10 g of carbon nanotubes to 100 mL of sulfuric acid solution (the mass concentration of the sulfuric acid solution is 6 mol / L), ultrasonicate for 4 h, then add 1.2 g of potassium permanganate, stir thoroughly, filter, dilute with deionized water, and add oxalic acid or sodium hydroxide for neutralization. Finally, dry in an oven at 100 ° C for 12 h to obtain carboxylated carbon nanotubes; P2. Add 5.5 g of polyethyleneimine to 50 mL of deionized water, then add carboxylated carbon nanotubes to prepare a carbon nanotube dispersion, place it in an oil bath, and condense and reflux at 120°C for 12 hours; obtain the product above the filter paper by vacuum filtration, wash it five times with deionized water, and then place it in a vacuum freeze dryer for freeze drying to obtain modified carbon nanotubes.

[0052] Example 15 The difference between Example 15 and Example 12 is that the mass ratio of carbon nanotubes to polyethyleneimine is 1:0.25.

[0053] Example 16 The difference between Example 16 and Example 12 is that the mass ratio of carbon nanotubes to polyethyleneimine is 1:0.65.

[0054] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the coating does not contain a reinforcing agent.

[0055] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that the reinforcing agent is silicon nitride powder.

[0056] Performance testing: (1) Wear resistance test: The pin-disc wear test was carried out at room temperature using an MMW1G universal friction and wear testing machine. The grinding material was GCr15 steel with a hardness of 58HRC. The test bar size was φ50mm×10mm, the load was 100N, and the speed was 120r·min. 1 , the test time is 30min; the mass of the sample before and after wear is weighed using a FA2004A electronic balance with an accuracy of 0.1mg, and the wear resistance is evaluated by the wear mass change rate. The test results are recorded in Table 1.

[0057] (2) Hardness test: The hardness was measured using a VH5 Vickers hardness tester equipped with the SVDM3 hardness software system. The load was 1 kg and the loading time was 15 s. Five points were measured for each specimen and the average value was taken. The test results are recorded in Table 1.

[0058] Table 1 sample Loss weight / g Hardness (HBW) Example 1 1.658 478 Example 2 1.488 496 Example 3 1.493 495 Example 4 1.491 494 Example 5 1.527 489 Example 6 1.523 490 Example 7 1.364 512 Example 8 1.372 510 Example 9 1.369 511 Example 10 1.395 508 Example 11 1.393 208 Example 12 1.243 528 Example 13 1.255 526 Example 14 1.251 526 Example 15 1.276 522 Example 16 1.278 523 Comparative Example 1 2.437 443 Comparative Example 2 1.718 472 Data Analysis Specifically combining the test results of Example 2 and Example 1, the wear resistance of Example 2 is better than that of Example 1. The analysis is as follows: the difference between Example 2 and Example 1 is that the reinforcing agent contains silicon nitride powder in addition to basalt flakes. Silicon nitride powder has the characteristics of high hardness and good chemical stability, and silicon nitride powder can easily enter the cracks and holes of basalt flakes, thereby improving the stability of silicon nitride powder in the coating, thereby improving the wear resistance of the seamless steel pipe.

[0059] Specifically combining the test results of Example 7 and Example 2, the wear resistance of Example 7 is better than that of Example 2. The analysis is as follows: the difference between Example 7 and Example 2 is that the basalt flakes are treated with carbon nanotubes after passivation, which improves the interface compatibility between the basalt flakes and the epoxy resin, and improves the stability of the basalt flakes in the wear-resistant coating, thereby improving the wear resistance of the seamless steel pipe.

[0060] Specifically combining the test results of Example 12 and Example 7, the wear resistance of Example 12 is better than that of Example 2. The analysis is as follows: the difference between Example 12 and Example 7 is that polyvinylamine is grafted onto the surface of the carbon nanotubes, which improves the dispersibility of the carbon nanotubes in the epoxy resin and improves the interfacial bonding between the carbon nanotubes and the epoxy resin matrix, thereby improving the wear resistance of the seamless steel pipe.

[0061] Specifically combining the test results of Example 1 and Comparative Example 1, the wear resistance of Example 1 is better than that of Comparative Example 1. The analysis is as follows: the difference between Example 1 and Comparative Example 1 is that: basalt flakes have the characteristics of high strength and wear resistance. With the help of the mutual combination of epoxy resin and basalt flakes, the wear resistance of the wear-resistant coating is effectively improved, thereby improving the wear resistance of the seamless steel pipe.

[0062] Specifically combining the test results of Example 2 and Comparative Example 2, the wear resistance of Example 2 is better than that of Comparative Example 2. The analysis is as follows: the difference between Example 2 and Comparative Example 2 is that the reinforcing agent contains basalt flakes in addition to silicon nitride micropowder. Basalt flakes have the characteristics of high strength and wear resistance, and silicon nitride micropowder can easily enter the cracks and holes of basalt flakes, thereby improving the stability of silicon nitride micropowder in the coating, thereby improving the wear resistance of the seamless steel pipe.

[0063] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A wear-resistant seamless steel pipe, comprising a seamless steel pipe body, characterized in that: The side wall of the seamless steel pipe body (1) is provided with a wear-resistant layer (2), and the wear-resistant layer (2) is formed by curing a wear-resistant coating, wherein the wear-resistant coating comprises 45-53 parts of epoxy resin, 33-40 parts of reinforcing agent, 10-14 parts of aromatic amine curing agent, 3-6 parts of organosilicon defoaming agent, and 28-34 parts of acetone, and the reinforcing agent comprises basalt flakes.

2. The wear-resistant seamless steel pipe according to claim 1, characterized in that: The reinforcing agent also includes silicon nitride powder.

3. The wear-resistant seamless steel pipe according to claim 2, characterized in that: The mass ratio of the basalt flakes to silicon nitride powder is 1: (0.62-0.86) The wear-resistant seamless steel pipe according to claim 1 is characterized in that the basalt flakes are obtained by modification, and the modification preparation method of the basalt flakes comprises the following steps: S1, adding carbon nanotubes to a mixture of concentrated nitric acid and concentrated sulfuric acid to react, and after the reaction is complete, washing, filtering, and drying are performed in sequence to obtain passivated carbon nanotubes; S2, adding KH-560 to a mixture of deionized water and ethanol, adjusting the pH to 4 with acetic acid, and obtaining a KH-560 hydrolyzate; adding basalt flakes to a xylene solution, stirring evenly, and then adding the KH-560 hydrolyzate to react. After the reaction is completed, pretreated basalt flakes are obtained; S3. Add the passivated carbon nanotubes into deionized water and stir thoroughly to obtain a carbon nanotube dispersion; add the pretreated basalt flakes into an acetone solution and stir thoroughly, then add the carbon nanotube dispersion and stir evenly, centrifuge, wash and dry in sequence to obtain a modified basalt flake.

4. The wear-resistant seamless steel pipe according to claim 4, characterized in that: The mass ratio of the basalt flakes to the carbon nanotubes is 1:(0.14-0.22).

5. The wear-resistant seamless steel pipe according to claim 4, characterized in that: The carbon nanotubes are prepared by modification, and the modification preparation method of the carbon nanotubes comprises the following steps: P1. Add carbon nanotubes to a sulfuric acid solution, stir evenly, then add potassium permanganate, stir thoroughly, filter, wash, and dry to obtain carboxylated carbon nanotubes; P2. Add polyethyleneimine to deionized water, then add carboxylated carbon nanotubes to prepare a carbon nanotube dispersion, and then reflux, filter, wash, and dry in sequence to obtain modified carbon nanotubes.

6. The wear-resistant seamless steel pipe according to claim 6, characterized in that: The mass ratio of the carbon nanotubes to polyethyleneimine is 1:(0.35-0.55).

7. The wear-resistant seamless steel pipe according to claim 1, characterized in that: The aromatic amine curing agent is m-phenylenediamine, and the organosilicon defoaming agent is silicone oil.

8. A method for preparing the wear-resistant seamless steel pipe according to claim 1, characterized in that: The steps include: S100, mixing epoxy resin, reinforcing agent, aromatic amine curing agent, silicone defoaming agent, and acetone, stirring evenly, and then allowing to stand to prepare a wear-resistant coating; S200, coating the wear-resistant coating on the surface of the seamless steel pipe body, and then curing the coating to obtain the seamless steel pipe.

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