Heat-resistant stainless steel seamless steel pipe and preparation method thereof

Abstract

The invention relates to a heat-resistant stainless steel seamless steel pipe which comprises a steel pipe body, the surface of the steel pipe body is coated with a heat-resistant treatment agent, and the heat-resistant treatment agent comprises polyphenylene sulfide, (trans)-2-cyclopropyl vinyl boronic acid pinacol ester, N-acryloyloxy succinimide, a palladium catalyst, glass fibers, filler and dimethyl sulfoxide. The preparation method of the heat-resistant stainless steel seamless steel tube comprises the steps of preparation of the heat-resistant treating agent and coating of the heat-resistant treating agent. According to the invention, polyphenylene sulfide with relatively high heat resistance is selected, under the catalysis of a palladium catalyst, (trans)-2-cyclopropyl vinyl boronic acid pinacol ester reacts with N-acryloyloxy succinimide to introduce a heat-resistant imide group, and the heat-resistant imide group and the polyphenylene sulfide have a synergistic interaction; boron oxide can be decomposed from a product carrying boric acid ester bonds at a high temperature, and cooperates with the glass fibers and the filler to form a compact coating, so that the heat resistance of the steel pipe body is improved.

Description

Technical Field

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

[0002] Currently, seamless stainless steel pipes are used in boilers, central air conditioning, steel structures, mechanical processing, pipeline gas, fire protection, etc.

[0003] The existing patent with publication number CN103727381A discloses a stainless steel tube having a hollow tube body made of stainless steel; the outer wall surface of the tube body is coated with a zirconium nitride layer; the inner wall of the tube body is attached with a plastic lining layer; the thickness of the zirconium nitride layer is 0.3-0.5 mm; and the thickness of the lining layer is less than 2 mm.

[0004] At present, many key parts of large-scale complete sets of equipment and devices use a large number of seamless pipes as pipelines, and the requirements for the heat resistance of the pipelines are also higher. Therefore, some existing steel pipes still have room for improvement. Summary of the Invention

[0005] In order to improve the heat resistance of seamless steel pipes, the present application provides a heat-resistant stainless steel seamless pipe and a preparation method thereof.

[0006] In the first aspect, the present application provides a heat-resistant stainless steel seamless pipe adopting the following technical solution: A heat-resistant stainless steel seamless pipe comprises a steel pipe body, the surface of which is coated with a heat-resistant treatment agent, wherein the heat-resistant treatment agent comprises the following components in parts by weight: 20-30 parts of polyphenylene sulfide; 10-14 parts of (trans)-2-cyclopropylvinylboronic acid pinacol ester; 5-8 parts of N-acryloyloxysuccinimide; 1-2 parts of palladium catalyst; 3-4 parts of glass fiber; 1-2 parts filler; 8-10 parts dimethyl sulfoxide.

[0007] By adopting the above technical solution, polyphenylene sulfide has higher heat resistance. Under the catalysis of palladium catalyst, the unsaturated double bond carried by (trans)-2-cyclopropyl vinylboronic acid pinacol ester undergoes olefin copolymerization with N-acryloyloxysuccinimide containing alkenyl groups, thereby increasing the degree of polymerization and introducing heat-resistant imide groups, which synergize with polyphenylene sulfide to better improve the heat resistance. In addition, the product carrying the borate ester bond can decompose into boron oxide at high temperature, and the glass fiber can act as a high-temperature adhesive to bond the boron oxide, filler and other components together to form a dense coating with good heat resistance, thereby effectively improving the heat resistance of the steel pipe body.

[0008] Preferably, the heat-resistant treatment agent further comprises 3-5 parts of phthalic anhydride-4-boric acid pinacol ester and 6-8 parts of methylmagnesium bromide, calculated by weight.

[0009] By adopting the above technical scheme, methylmagnesium bromide is used to carry out nucleophilic addition on a carbonyl group of phthalic anhydride-4-pinacol borate to form an intermediate ketone structure, which continues to undergo nucleophilic addition with methylmagnesium bromide to form a new carbon chain; phthalic anhydride-4-pinacol borate and (trans)-2-cyclopropylvinylpinacol borate both have boron-oxygen bond structures, and phthalic anhydride-4-pinacol borate contains a heat-resistant benzene ring, which is beneficial for protecting the steel pipe body at high temperatures; and this product synergizes with the polymerization product of polyphenylene sulfide, (trans)-2-cyclopropylvinylpinacol borate and N-acryloyloxysuccinimide to improve the heat resistance of the steel pipe body.

[0010] Preferably, the heat-resistant treatment agent further comprises 4-5 parts of water and 0.5-0.6 parts of dibutyltin dilaurate, by weight.

[0011] By adopting the above technical solution, under the action of water, the magnesium salt of the magnesium salt complex generated by the reaction of methyl magnesium bromide with phthalic anhydride-4-boric acid pinacol ester is partially hydrolyzed to generate the corresponding alcohol; N-acryloyloxysuccinimide also carries an ester group. Under the catalysis of dibutyltin dilaurate, the heat resistance of the heat-resistant treatment agent is improved through the ester exchange reaction between the two, thereby improving the heat resistance of the steel pipe body.

[0012] Preferably, in terms of weight ratio, the polyphenylene sulfide: (trans)-2-cyclopropyl vinylboronic acid pinacol ester: N-acryloyloxysuccinimide: phthalic anhydride-4-boronic acid pinacol = 13:5:3:2.

[0013] Preferably, the palladium catalyst is bistriphenylphosphine palladium dichloride; and the filler is carbon nanotube powder.

[0014] In a second aspect, the present application provides a method for preparing a heat-resistant stainless steel seamless pipe, which adopts the following technical solution: A method for preparing a heat-resistant stainless steel seamless pipe comprises the following steps: S1. Preparation of a heat-resistant treatment agent; (trans)-2-cyclopropylvinylboronic acid pinacol ester and 4-5 parts of dimethyl sulfoxide were blended, and N-acryloyloxysuccinimide and a palladium catalyst were added, and the temperature was raised to 60-70 ° C and stirred for 2-3 hours to obtain a mixed product A; polyphenylene sulfide and the remaining dimethyl sulfoxide, glass fiber and filler were then added to prepare a heat-resistant treatment agent; S2. Applying a heat-resistant treatment agent; preheat the heat-resistant treatment agent prepared in S1 to 60-70°C, apply it evenly to the steel pipe body to be treated, apply it 2-3 times, and the coating thickness is 0.3-0.4mm. Then dry it at 100-120°C and cool it to room temperature to obtain a heat-resistant stainless steel seamless pipe.

[0015] Preferably, S1 further comprises the following steps: placing 6-8 parts of methylmagnesium bromide in an ice-water bath at 0°C, adding 3-5 parts of phthalic anhydride-4-boronic acid pinacol ester dropwise through a dropping funnel under nitrogen protection, then stirring the reaction for 1-2 hours, and then adding 2-3 parts of a saturated aqueous ammonium chloride solution to quench the reaction, to obtain an intermediate product B; The intermediate product B is mixed with 4-5 parts of water for hydrolysis, then extracted with ethyl acetate, and evaporated to obtain a mixed product C; the mixed product C, the mixed product A and 0.5-0.6 parts of dibutyltin dilaurate are then mixed, and stirred for reaction at 60-70°C for 1-2 hours; finally, 20-30 parts of polyphenylene sulfide and the remaining dimethyl sulfoxide, 3-4 parts of glass fiber and 1-2 parts of filler are added and mixed to obtain a heat-resistant treatment agent.

[0016] In summary, this application has the following beneficial technical effects: Polyphenylene sulfide has high heat resistance. Under the catalysis of palladium catalyst, the unsaturated double bond carried by (trans)-2-cyclopropyl vinylboronic acid pinacol ester undergoes olefin copolymerization with N-acryloyloxysuccinimide containing alkenyl groups, increasing the degree of polymerization while introducing heat-resistant imide groups, which synergize with polyphenylene sulfide to further improve heat resistance. In addition, the product carrying borate ester bonds can decompose into boron oxide at high temperatures. Glass fiber can act as a high-temperature adhesive, bonding the boron oxide, filler and other components together to form a dense coating with good heat resistance, effectively improving the heat resistance of the steel pipe body. Methylmagnesium bromide is used to undergo nucleophilic addition to a carbonyl group of phthalic anhydride-4-pinacol borate to form an intermediate ketone structure, which then undergoes nucleophilic addition with methylmagnesium bromide to form a new carbon chain. Both phthalic anhydride-4-pinacol borate and (trans)-2-cyclopropylvinylboronic acid pinacol ester have boron-oxygen bond structures, and phthalic anhydride-4-pinacol borate contains a heat-resistant benzene ring, which is beneficial for protecting the steel pipe body at high temperatures. This product also synergizes with the polymerization product of polyphenylene sulfide, (trans)-2-cyclopropylvinylboronic acid pinacol ester, and N-acryloyloxysuccinimide to improve the heat resistance of the steel pipe body. Under the action of water, the magnesium salt of the magnesium salt complex generated by the reaction of methylmagnesium bromide with phthalic anhydride-4-boric acid pinacol ester is partially hydrolyzed to generate the corresponding alcohol; N-acryloyloxysuccinimide also carries an ester group. Under the catalysis of dibutyltin dilaurate, the heat resistance of the heat-resistant treatment agent is improved through the ester exchange reaction between the two, thereby improving the heat resistance of the steel pipe body. DETAILED DESCRIPTION

[0017] The following is a further detailed description of this application.

[0018] In this application, polyphenylene sulfide was provided by Chongqing Kalan Pharmaceutical Co., Ltd., CAS No.: 26125-40-6; trans-2-cyclopropyl vinylboronic acid pinacol ester was provided by Xi'an Qiyue Biotechnology Co., Ltd., item No. Q-0053907, CAS No.: 849061-99-0; N-acryloyloxysuccinimide, CAS No.: 38862-24-7; bistriphenylphosphine palladium dichloride was provided by Jiangsu Runfeng Synthetic Technology Co., Ltd., CAS No.: 13965-03-2; glass fiber Glue was provided by Lingshou County Shuolong Mineral Products Processing Plant, item number SL-12, 325 mesh; carbon nanotube powder was provided by Jiaxing Bona New Materials Co., Ltd., item number NACODC8-1, 1000 mesh, tube diameter 15-25nm, tube length 5-15μm; phthalic anhydride-4-boric acid pinacol ester, CAS number: 849677-21-0; methyl magnesium bromide was provided by Shaoxing Shangyu Hualun Chemical Co., Ltd., CAS number: 75-16-1; dibutyltin dilaurate, CAS number: 77-58-7.

[0019] Unless otherwise specified, the raw materials used in the following embodiments can be obtained from common commercial sources. Example

[0020] Example 1: This example discloses a heat-resistant stainless steel seamless pipe and a preparation method thereof; a heat-resistant stainless steel seamless pipe, comprising a steel pipe body, the surface of the steel pipe body being coated with a heat-resistant treatment agent, the heat-resistant treatment agent comprising the following components: polyphenylene sulfide, (trans)-2-cyclopropylvinylboronic acid pinacol ester, N-acryloyloxysuccinimide, a palladium catalyst, glass fiber, a filler and dimethyl sulfoxide, wherein the palladium catalyst is bistriphenylphosphine palladium dichloride and the filler is carbon nanotube powder; the content of each component is shown in Table 1 below.

[0021] A method for preparing a heat-resistant stainless steel seamless pipe comprises the following steps: S1. Preparation of a heat-resistant treatment agent; (trans)-2-cyclopropylvinylboronic acid pinacol ester and 4 parts of dimethyl sulfoxide were blended, and N-acryloyloxysuccinimide and a palladium catalyst were added, and the temperature was raised to 60 ° C and stirred for 2 hours to obtain a mixed product A; polyphenylene sulfide and the remaining dimethyl sulfoxide, glass fiber and filler were then added to prepare a heat-resistant treatment agent; S2. Application of heat-resistant treatment agent: preheat the heat-resistant treatment agent prepared in S1 to 60°C, apply it evenly on the steel pipe body to be treated, apply it twice, and the coating thickness is 0.3 mm. Then, dry it at 100°C and cool it to room temperature to obtain a heat-resistant stainless steel seamless pipe.

[0022] The mixed product A was tested by infrared spectrum: at 1680-1620cm -1 and 990-910cm -1 No carbon-carbon double bond (C=C) stretching vibration peak was detected in the range of 1350-1300cm -1 The region shows a strong absorption band of the BO bond stretching vibration in pinacol borate; and at 1770-1730 cm -1 and 1710-1700cm -1 The close but not identical characteristic absorption peaks of the two carbonyl groups on the imide ring were detected, indicating that the reaction occurred.

[0023] Example 2: This example discloses a heat-resistant stainless steel seamless pipe and a preparation method thereof; a heat-resistant stainless steel seamless pipe, comprising a steel pipe body, the surface of the steel pipe body being coated with a heat-resistant treatment agent, the heat-resistant treatment agent comprising the following components: polyphenylene sulfide, (trans)-2-cyclopropylvinylboronic acid pinacol ester, N-acryloyloxysuccinimide, a palladium catalyst, glass fiber, a filler and dimethyl sulfoxide, wherein the palladium catalyst is bistriphenylphosphine palladium dichloride and the filler is carbon nanotube powder; the content of each component is shown in Table 1 below.

[0024] A method for preparing a heat-resistant stainless steel seamless pipe comprises the following steps: S1. Preparation of a heat-resistant treatment agent; (trans)-2-cyclopropylvinylboronic acid pinacol ester and 5 parts of dimethyl sulfoxide were blended, and N-acryloyloxysuccinimide and a palladium catalyst were added, and the temperature was raised to 70 ° C and stirred for 3 hours to obtain a mixed product A; polyphenylene sulfide and the remaining dimethyl sulfoxide, glass fiber and filler were then added to prepare a heat-resistant treatment agent; S2. Application of heat-resistant treatment agent: preheat the heat-resistant treatment agent prepared in S1 to 70°C, apply it evenly on the steel pipe body to be treated, apply it three times, and the coating thickness is 0.4 mm. Then, dry it at 120°C and cool it to room temperature to obtain a heat-resistant stainless steel seamless pipe.

[0025] Example 3: This example discloses a heat-resistant stainless steel seamless pipe and a preparation method thereof; a heat-resistant stainless steel seamless pipe, comprising a steel pipe body, the surface of the steel pipe body being coated with a heat-resistant treatment agent, the heat-resistant treatment agent comprising the following components: polyphenylene sulfide, (trans)-2-cyclopropylvinylboronic acid pinacol ester, N-acryloyloxysuccinimide, a palladium catalyst, glass fiber, a filler and dimethyl sulfoxide, wherein the palladium catalyst is bistriphenylphosphine palladium dichloride and the filler is carbon nanotube powder; the content of each component is shown in Table 1 below.

[0026] A method for preparing a heat-resistant stainless steel seamless pipe comprises the following steps: S1. Preparation of a heat-resistant treatment agent; (trans)-2-cyclopropylvinylboronic acid pinacol ester and 5 parts of dimethyl sulfoxide were blended, and N-acryloyloxysuccinimide and a palladium catalyst were added, and the temperature was raised to 65 ° C and stirred for 2.5 hours to obtain a mixed product A; polyphenylene sulfide and the remaining dimethyl sulfoxide, glass fiber and filler were then added to prepare a heat-resistant treatment agent; S2. Application of heat-resistant treatment agent: preheat the heat-resistant treatment agent prepared in S1 to 65°C, apply it evenly on the steel pipe body to be treated, apply it three times, and the coating thickness is 0.3 mm. Then, dry it at 110°C and cool it to room temperature to obtain a heat-resistant stainless steel seamless pipe.

[0027] Example 4: The difference from Example 1 is that this example discloses a heat-resistant stainless steel seamless pipe and a preparation method thereof; a heat-resistant stainless steel seamless pipe, comprising a steel pipe body, the surface of the steel pipe body being coated with a heat-resistant treatment agent, the heat-resistant treatment agent comprising the following components: polyphenylene sulfide, (trans)-2-cyclopropylvinylboronic acid pinacol ester, N-acryloyloxysuccinimide, a palladium catalyst, glass fiber, filler, dimethyl sulfoxide, phthalic anhydride-4-boronic acid pinacol ester, methyl magnesium bromide, water and dibutyltin dilaurate, wherein the palladium catalyst is bistriphenylphosphine palladium dichloride and the filler is carbon nanotube powder; the content of each component is shown in Table 1 below.

[0028] A method for preparing a heat-resistant stainless steel seamless pipe, S1 further comprising the following steps: Place methylmagnesium bromide in an ice-water bath at 0°C. Under nitrogen protection, add phthalic anhydride-4-boronic acid pinacol ester dropwise through a dropping funnel. Then stir and react for 1 hour. Then, add 2 parts of saturated ammonium chloride aqueous solution to quench the reaction to obtain intermediate product B. The intermediate product B is mixed with water for hydrolysis, then extracted with ethyl acetate, and evaporated to obtain a mixed product C; the mixed product C, the mixed product A and dibutyltin dilaurate are then mixed, and stirred for reaction at 60°C for 1 hour; finally, polyphenylene sulfide and the remaining dimethyl sulfoxide, glass fiber and filler are added and mixed to obtain a heat-resistant treatment agent.

[0029] Example 5: The difference from Example 2 is that this example discloses a heat-resistant stainless steel seamless pipe and a preparation method thereof; a heat-resistant stainless steel seamless pipe, comprising a steel pipe body, the surface of the steel pipe body being coated with a heat-resistant treatment agent, the heat-resistant treatment agent comprising the following components: polyphenylene sulfide, (trans)-2-cyclopropylvinylboronic acid pinacol ester, N-acryloyloxysuccinimide, a palladium catalyst, glass fiber, filler, dimethyl sulfoxide, phthalic anhydride-4-boronic acid pinacol ester, methyl magnesium bromide, water and dibutyltin dilaurate, wherein the palladium catalyst is bistriphenylphosphine palladium dichloride and the filler is carbon nanotube powder; the content of each component is shown in Table 1 below.

[0030] A method for preparing a heat-resistant stainless steel seamless pipe, S1 further comprising the following steps: Place methylmagnesium bromide in an ice-water bath at 0°C. Under nitrogen protection, add phthalic anhydride-4-boronic acid pinacol ester dropwise through a dropping funnel. Then stir and react for 2 hours. Then, add 3 parts of saturated ammonium chloride aqueous solution to quench the reaction to obtain intermediate product B. The intermediate product B is mixed with water for hydrolysis, then extracted with ethyl acetate, and evaporated to obtain a mixed product C; the mixed product C, the mixed product A and dibutyltin dilaurate are then mixed, and stirred for reaction at 70°C for 2 hours; finally, polyphenylene sulfide and the remaining dimethyl sulfoxide, glass fiber and filler are added and mixed to obtain a heat-resistant treatment agent.

[0031] Example 6: The difference from Example 3 is that this example discloses a heat-resistant stainless steel seamless pipe and a preparation method thereof; a heat-resistant stainless steel seamless pipe, comprising a steel pipe body, the surface of the steel pipe body being coated with a heat-resistant treatment agent, the heat-resistant treatment agent comprising the following components: polyphenylene sulfide, (trans)-2-cyclopropylvinylboronic acid pinacol ester, N-acryloyloxysuccinimide, a palladium catalyst, glass fiber, filler, dimethyl sulfoxide, phthalic anhydride-4-boronic acid pinacol ester, methyl magnesium bromide, water and dibutyltin dilaurate, wherein the palladium catalyst is bistriphenylphosphine palladium dichloride and the filler is carbon nanotube powder; the content of each component is shown in Table 1 below.

[0032] A method for preparing a heat-resistant stainless steel seamless pipe, S1 further comprising the following steps: Place methylmagnesium bromide in an ice-water bath at 0°C. Under nitrogen protection, add phthalic anhydride-4-boronic acid pinacol ester dropwise through a dropping funnel. Then stir and react for 1.5 hours. Then, add 3 parts of saturated ammonium chloride aqueous solution to quench the reaction to obtain intermediate product B. The intermediate product B is mixed with water for hydrolysis, then extracted with ethyl acetate, and evaporated to obtain a mixed product C; the mixed product C, the mixed product A and dibutyltin dilaurate are then mixed, and stirred for reaction at 65°C for 1.5 hours; finally, polyphenylene sulfide and the remaining dimethyl sulfoxide, glass fiber and filler are added and mixed to obtain a heat-resistant treatment agent.

[0033] Example 7: The difference from Example 1 is that the heat-resistant treatment agent further includes phthalic anhydride-4-boric acid pinacol ester and methyl magnesium bromide.

[0034] Example 8: The difference from Example 7 is that phthalic anhydride-4-boric acid pinacol ester is replaced by dimethylsuccinic anhydride.

[0035] Example 9: The difference from Example 4 is that, by weight, the ratio of polyphenylene sulfide: (trans)-2-cyclopropylvinylboronic acid pinacol ester: N-acryloyloxysuccinimide: phthalic anhydride-4-boric acid pinacol = 13:5:3:2; that is, 26 parts of polyphenylene sulfide, 10 parts of (trans)-2-cyclopropylvinylboronic acid pinacol ester, 6 parts of N-acryloyloxysuccinimide, and 4 parts of phthalic anhydride-4-boric acid pinacol. Comparative Example

[0036] Comparative Example 1 The difference from Example 1 is that a steel pipe body that is not treated with a heat-resistant treatment agent is used as Comparative Example 1.

[0037] Comparative Example 2 The difference from Example 1 is that (trans)-2-cyclopropylvinylboronic acid pinacol ester is replaced by phenylboronic acid pinacol ester.

[0038] Comparative Example 3 The difference from Comparative Example 2 is that N-acryloyloxysuccinimide is replaced by succinimide.

[0039] Comparative Example 4 The difference from Example 1 is that the palladium catalyst bistriphenylphosphine palladium dichloride is replaced by palladium chloride.

[0040] Table 1 Component contents of Examples 1-6 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 polyphenylene sulfide 20 30 25 20 30 25 (trans)-2-Cyclopropylvinylboronic acid pinacol ester 10 14 12 10 14 12 N-Acryloyloxysuccinimide 5 8 7 5 8 7 Palladium catalyst 1 2 2 1 2 2 fiberglass 3 4 3 3 4 3 filler 1 2 2 1 2 2 dimethyl sulfoxide 8 10 9 8 10 9 Phthalic anhydride-4-boronic acid pinacol ester / / / 3 5 4 Methylmagnesium bromide / / / 6 8 7 water / / / 4 5 4 Dibutyltin dilaurate / / / 0.5 0.6 0.6 Performance testing

[0041] Test method: Samples with a diameter of 12 mm × 60 mm were prepared using the preparation methods of the embodiments and comparative examples. The fracture time of the samples of the embodiments and comparative examples was tested at 400°C and the same stress of 30 MPa. The longer the fracture time at high temperature, the better the heat resistance. The test results are shown in Table 2 below.

[0042] Table 2 Performance test results of various embodiments and comparative examples 400℃ fracture time / h Example 1 61.3 Example 2 62.1 Example 3 61.6 Example 4 69.4 Example 5 70.2 Example 6 69.8 Example 7 67.7 Example 8 63.2 Example 9 69.9 Comparative Example 1 40.2 Comparative Example 2 53.8 Comparative Example 3 49.9 Comparative Example 4 60.6 This specific implementation manner is merely an explanation of the present application and is not intended to limit the scope of protection of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present implementation manner as needed, but as long as they are within the scope of the claims of the present application, they are protected by patent law.

Claims

1. A heat-resistant stainless steel seamless pipe, comprising a steel pipe body, characterized in that: The surface of the steel pipe body is coated with a heat-resistant treatment agent, which includes the following components in parts by weight: 20-30 parts of polyphenylene sulfide; 10-14 parts of (trans)-2-cyclopropylvinylboronic acid pinacol ester; 5-8 parts of N-acryloyloxysuccinimide; 1-2 parts of palladium catalyst; 3-4 parts of glass fiber; 1-2 parts filler; 8-10 parts dimethyl sulfoxide.

2. The heat-resistant stainless steel seamless pipe according to claim 1, characterized in that: The heat-resistant treatment agent further comprises 3-5 parts of phthalic anhydride-4-boric acid pinacol ester and 6-8 parts of methyl magnesium bromide in parts by weight.

3. The heat-resistant stainless steel seamless pipe according to claim 2, characterized in that: The heat-resistant treatment agent further comprises 4-5 parts of water and 0.5-0.6 parts of dibutyltin dilaurate by weight.

4. The heat-resistant stainless steel seamless pipe according to claim 1, characterized in that: In terms of weight ratio, the polyphenylene sulfide: (trans)-2-cyclopropyl vinylboronic acid pinacol ester: N-acryloyloxysuccinimide: phthalic anhydride-4-boronic acid pinacol = 13:5:3:

2.

5. The heat-resistant stainless steel seamless pipe according to claim 1, characterized in that: The palladium catalyst is bistriphenylphosphine palladium dichloride; and the filler is carbon nanotube powder.

6. The method for preparing a heat-resistant stainless steel seamless pipe according to claim 1, characterized in that: The steps include: S1. Preparation of a heat-resistant treatment agent; (trans)-2-cyclopropylvinylboronic acid pinacol ester and 4-5 parts of dimethyl sulfoxide were blended, and N-acryloyloxysuccinimide and a palladium catalyst were added, and the temperature was raised to 60-70 ° C and stirred for 2-3 hours to obtain a mixed product A; polyphenylene sulfide and the remaining dimethyl sulfoxide, glass fiber and filler were then added to prepare a heat-resistant treatment agent; S2. Applying a heat-resistant treatment agent; preheat the heat-resistant treatment agent prepared in S1 to 60-70°C, apply it evenly to the steel pipe body to be treated, apply it 2-3 times, and the coating thickness is 0.3-0.4mm. Then dry it at 100-120°C and cool it to room temperature to obtain a heat-resistant stainless steel seamless pipe.

7. The method for preparing a heat-resistant stainless steel seamless pipe according to claim 6, characterized in that: Said S1 further comprises the following steps: placing 6-8 parts of methylmagnesium bromide in an ice-water bath at 0°C, adding 3-5 parts of phthalic anhydride-4-boronic acid pinacol ester dropwise through a dropping funnel under nitrogen protection, then stirring the mixture for 1-2 hours, and then adding 2-3 parts of a saturated aqueous ammonium chloride solution to quench the mixture, to obtain an intermediate product B; The intermediate product B is mixed with 4-5 parts of water for hydrolysis, then extracted with ethyl acetate, and evaporated to obtain a mixed product C; the mixed product C, the mixed product A and 0.5-0.6 parts of dibutyltin dilaurate are then mixed, and stirred for reaction at 60-70°C for 1-2 hours; finally, 20-30 parts of polyphenylene sulfide and the remaining dimethyl sulfoxide, 3-4 parts of glass fiber and 1-2 parts of filler are added and mixed to obtain a heat-resistant treatment agent.