A triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor and its preparation method
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-20
- Publication Date
- 2026-08-14
AI Technical Summary
然而，传统的物理复配体系在苛刻工况下的应用存在一定局限性：首先，不同功能（阻垢与缓蚀）的分子结构在金属表面存在界面竞争吸附，较难构筑连续、致密的双层吸附膜，导致缓蚀与阻垢效率难以同时兼顾
（1）将三唑杂环、疏水长链烷基与多胺多甲叉膦酸共价结合。相较于传统物理复配体系，有效克服了药剂在高温、高矿化度流体中的相容性劣势，从而缓解多组分体系在金属界面的竞争吸附效应，实现缓蚀与阻垢的高效协同；
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Figure CN122562837A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of industrial water treatment chemicals, specifically to a triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor and its preparation method. Background Technology
[0002] During oil and gas extraction and gathering, with the increase in formation well depth and the widespread use of water injection circulation, the fluids in gathering pipelines gradually exhibit typical characteristics such as high temperature, high salinity, and high hardness. Under these harsh conditions, the metal electrochemical corrosion and mineral scaling problems in the gathering and transportation system often mutually induce and exacerbate each other. On the one hand, the loose scale layer precipitated on the metal surface hinders the spread of corrosion inhibitors, easily leading to severe under-deposit corrosion; on the other hand, the iron ions generated by corrosion act as heterogeneous nucleation centers, significantly reducing the nucleation barrier for scaling, easily inducing explosive scaling, which poses a serious threat to the safe operation of the gathering and transportation pipeline network.
[0003] Currently, industrial applications often employ physical compound systems of organophosphonic acids (such as ATMP and HEDP) and nitrogen-containing heterocyclic compounds (such as BTA and TTA) to address the aforementioned corrosion and scale inhibition requirements. However, traditional physical compound systems have certain limitations in harsh operating conditions: First, the molecular structures with different functions (scale inhibition and corrosion inhibition) exhibit interfacial competitive adsorption on metal surfaces, making it difficult to construct a continuous and dense bilayer adsorption film, thus hindering the simultaneous achievement of both corrosion inhibition and scale inhibition efficiencies. Second, the separate addition of multiple components complicates the process, and the long-term compatibility and dispersion stability of the agents are easily affected. Therefore, developing a novel protective agent aimed at overcoming interfacial competitive adsorption of compound agents and achieving synergistic effects of multiple active sites within a single structure is a technical problem that needs to be solved in this field. Summary of the Invention
[0004] This invention provides a triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor and its preparation method. It achieves lattice distortion and coordination anchoring through polar groups, while relying on hydrophobic long chains to form a dense film for corrosion prevention and steric resistance to calcium for scale prevention. This solution achieves deep synergy between scale inhibition and corrosion inhibition, as well as long-lasting protection.
[0005] To achieve the above objectives, the present invention employs the following technical solution: A triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor, characterized in that the triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor is obtained by reacting a triazole-modified polyamine intermediate with phosphorous acid and formaldehyde in a molar ratio of 1:4~6:8~12, and the general structural formula of the triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor is as follows: ; In the formula, the value of n ranges from 12 to 20; In the formula, R is selected from one of the following structures: .
[0006] Furthermore, the triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor is characterized in that the triazole-modified polyamine intermediate is obtained by reacting a triazole derivative, a polyamine monomer, and triethylamine in a molar ratio of 1:1:2, and the general structural formula of the triazole-modified polyamine intermediate is as follows: ; In the formula, the value of n ranges from 12 to 20; In the formula, M is selected from one of the following structures: .
[0007] Furthermore, the triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor is characterized in that the triazole derivative is obtained by reacting 1,2,4-triazole, α,ω-dibromoalkane, and sodium hydride in a molar ratio of 1:1:1, and the general structural formula of the triazole derivative is as follows: ; In the formula, the value of n ranges from 12 to 20.
[0008] Furthermore, the preparation method of the triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor is characterized in that the preparation method of the triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor is as follows: S1. 1,2,4-triazole, α,ω-dibromoalkane and sodium hydride were added to a round-bottom flask, N,N-dimethylformamide was added, and the mixture was reacted at room temperature for 10-16 h. After the reaction was completed, the triazole derivative was obtained by extraction with ethyl acetate and rotary evaporation. S2. Add the triazole derivative and polyamine monomer to a round-bottom flask, add N,N-dimethylformamide, and add triethylamine as an acid-binding agent. React at 60~80℃ for 6~10h. After the reaction is completed, the triazole-modified polyamine intermediate is obtained by purification, separation, rotary evaporation, and vacuum drying. S3. Add the triazole-modified polyamine intermediate, phosphorous acid and formaldehyde to a three-necked flask, add deionized water, and then add 6 ml of concentrated hydrochloric acid. React at 90~110℃ for 5~8 h. After the reaction is completed, wash with water and rotary evaporate to obtain the triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor.
[0009] The beneficial effects of this invention are as follows: (1) Triazole heterocycles, hydrophobic long-chain alkyl groups, and polyamine polymethylphosphonic acid are covalently combined. Compared with traditional physical compound systems, this effectively overcomes the compatibility disadvantage of the agent in high-temperature and high-mineralization fluids, thereby alleviating the competitive adsorption effect of multi-component systems at the metal interface and achieving efficient synergy between corrosion inhibition and scale inhibition; (2) Relying on the strong coordination adsorption of the triazole ring and the hydrophobic steric hindrance of the long-chain alkyl group, a synergistic anti-corrosion barrier of "chemical anchoring and physical isolation" is constructed on the metal surface, reducing the corrosion rate of carbon steel to 0.0527 mm / a at a dosage of 50 mg / L. At the same time, the poly(methylene phosphonic acid) group exerts a strong chelating and lattice distortion effect, which, combined with the steric hindrance of the alkyl group, significantly reduces the risk of "calcium sensitivity". At 80℃, the scale inhibition rates of calcium carbonate and calcium sulfate are both stable at over 90%, successfully achieving both corrosion prevention and scale inhibition.
[0010] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description
[0011] Figure 1 Example 1 contains a triazole derivative. 1 H-NMR spectrum; Figure 2 Example 1 contains a triazole derivative and a triazole-modified polyamine intermediate. 1 H-NMR comparison chart; Figure 3 Example 1 is a triazole-modified polyamine intermediate and a triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor. 1 H-NMR comparison chart; Figure 4 The image shows the FT-IR spectrum of the triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor in Example 1. Figure 5 The graph shows the test results of the scale inhibition and corrosion inhibition performance of corrosion inhibitor Z1 in Example 1; Figure 6 The graph shows the effect of corrosion and scale inhibitor Z1 on calcium carbonate in Example 1. The reaction conditions were a concentration of 15 mg / L, a temperature of 80°C, and a time of 10 h. Figure 7 The image shows the effect of corrosion and scale inhibitor Z1 on calcium sulfate in Example 1. The reaction conditions were a concentration of 20 mg / L, a temperature of 80°C, and a time of 10 h. Figure 8 The images show the steel plates before and after cleaning after a 72-hour corrosion test using corrosion inhibitor Z1 (50 mg / L) in Example 1. Detailed Implementation
[0012] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0013] Example 1: A triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor and its preparation method, comprising the following steps: S1. Preparation of triazole derivatives: Under nitrogen protection and anhydrous conditions, 1,2,4-triazole (1.38 g, 20 mmol) was dissolved in 30 mL of N,N-dimethylformamide (DMF). Sodium hydride (0.48 g, 20 mmol) was added in portions under ice bath conditions, and the mixture was stirred until no more bubbles were generated. Then, 1,12-dibromododecane (6.56 g, 20 mmol) was slowly added dropwise. After the addition was complete, the mixture was moved to room temperature and stirred for 10 h. After the reaction was complete, deionized water was added and the mixture was stirred vigorously for 5 min. The mixture was then extracted with an equal volume of ethyl acetate. The organic phase was collected and concentrated under reduced pressure to remove the solvent, yielding the triazole derivatives. The reaction formula is as follows: ; Figure 1 Triazole derivatives 1 H-NMR spectrum, structure 1 H-NMR (CDCl3) confirmed that δ=8.02(s,1H) and 7.85(s,1H) correspond to the protons of the 1,2,4-triazole ring; δ=4.11(t,2H) corresponds to the methylene group (-CH2-N-) attached to the nitrogen atom of the triazole ring; δ=3.37(t,2H) corresponds to the terminal bromomethylene group (-CH2-Br); δ=1.82(m,4H) and δ=1.20-1.35(m,16H) correspond to the remaining methylene protons of the long-chain alkyl group. The analysis shows that the triazole derivative was successfully synthesized.
[0014] S2. Preparation of the triazole-modified polyamine intermediate: A triazole derivative (3.76 g, 10 mmol), tetraethylenepentamine (2.25 g, 10 mmol), and 40 mL of N,N-dimethylformamide (DMF) were added sequentially to a round-bottom flask, followed by the dropwise addition of triethylamine (2.02 g, 20 mmol). Under nitrogen protection, the system was heated to 80 °C and refluxed with stirring for 10 h. After the reaction was complete, the reaction solution was purified, separated, rotary evaporated, and vacuum dried to obtain the triazole-modified polyamine intermediate, as shown in the following reaction formula: ; Figure 2 intermediates of triazole derivatives and triazole-modified polyamines 1 The H-NMR comparison shows that δ=8.5 and 8.0 correspond to protons in the 1,2,4-triazole ring; δ=5.6 corresponds to the hydroxyl group (-OH) of the phosphonic acid group; δ=4.2 corresponds to the methylene group (-CH2-N-) attached to the triazole ring; the δ=3.0-3.5 range corresponds to the tetraethylenepentamine skeleton and the newly introduced methylenephosphonic acid (-N-CH2-P-) proton group; and δ=1.2-1.5 corresponds to the core methylene proton of the long-chain alkyl group. 1 The H-NMR spectrum shows that the triazole-modified polyamine intermediate was successfully synthesized.
[0015] Preparation of Triazole-Modified Polyamine Polyphosphonic Acid Corrosion and Scale Inhibitor S3: Triazole-modified polyamine intermediate (3.5 g, 8.5 mmol), deionized water, and 6 mL of concentrated hydrochloric acid were dissolved in a three-necked flask under stirring. Then, phosphorous acid (4.18 g, 51 mmol) was added. The system was heated to 110 °C under stirring, and 7.5 mL of 37% formaldehyde aqueous solution (102 mmol) was slowly added dropwise over 30 min. After the addition was complete, the mixture was refluxed at 110 °C for 8 h. After the reaction was complete, the mixture was washed with water and rotary evaporated to obtain the triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor (Z1). The reaction formula is as follows: ; Figure 3 Triazole-modified polyamine intermediate and triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor 1 The H-NMR comparison chart retains the characteristic peaks of triazole ring protons and long-chain alkyl groups near δ=8.0 and 8.5, and adds a significant phosphonic acid group -OH signal near δ=5.6. In addition, the δ=3.0–3.5 range shows overlapping proton groups belonging to the polyamine skeleton and the newly introduced methylenephosphonic acid (-N-CH2-P-). Figure 4 The FT-IR spectrum of the triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor shows the CH stretching vibrations of the triazole ring and alkyl chain, as well as the typical P=O (1200 cm⁻¹) pattern. -1 Nearby), PO (1050cm) -1 The strong absorption peaks (nearby) and the broad absorption band of P-OH. Combined with... 1 H-NMR and FT-IR confirmed the successful preparation of a triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor. Figure 5 The results of scale inhibition and corrosion inhibition performance tests for corrosion inhibitor Z1 are as follows: Scale inhibition performance is based on the People's Republic of China Petroleum and Natural Gas Industry Standard SY / T5673-2020, and compared with a commercial scale inhibitor (diethylenetriaminepentamethylenephosphonic acid DTPMP). The results show that corrosion inhibitor Z1 achieved a scale inhibition rate of 93.7% for calcium carbonate at 15 ppm (commercial scale inhibitor: 95.2%), and a scale inhibition rate of 95.4% for calcium sulfate at 20 ppm (commercial scale inhibitor: 94.5%). Corrosion inhibition performance is based on standard SY / T0026.1-2024. The results show that adding 50 mg / L of corrosion inhibitor Z1 can reduce the corrosion rate of L80 steel sheets from 0.0985 mm / a in the blank group to 0.0527 mm / a, meeting the standard requirement of less than 0.076 mm / a. Figure 6 The effect of Z1 corrosion and scale inhibitor on calcium carbonate at 80℃ for 10 hours is shown in the figure. Figure 7 The effect of Z1 corrosion and scale inhibitor on calcium sulfate at 80℃ for 10 hours is shown in the figure. Figure 8 The images show the steel plates before and after cleaning after 72 hours of corrosion testing using the corrosion inhibitor Z15.
[0016] Example 2: A triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor and its preparation method, comprising the following steps: S1, the preparation of the triazole derivative is the same as step S1 in Example 1; S2. Preparation of the triazole-modified polyamine intermediate: A triazole derivative (3.76 g, 10 mmol), triethylenetetramine (1.74 g, 10 mmol), and 40 mL of N,N-dimethylformamide (DMF) were added sequentially to a round-bottom flask, followed by the dropwise addition of triethylamine (2.02 g, 20 mmol). Under nitrogen protection, the system was heated to 70 °C and refluxed with stirring for 8 h. After the reaction was complete, the reaction solution was purified, separated, rotary evaporated, and vacuum dried to obtain the triazole-modified polyamine intermediate, as shown in the following reaction formula: ; Preparation of Triazole-Modified Polyamine Polyphosphonic Acid Corrosion and Scale Inhibitor S3: Triazole-modified polyamine intermediate (3.24 g, 8.5 mmol), deionized water, and 6 mL of concentrated hydrochloric acid were dissolved in a three-necked flask by stirring. Then, phosphorous acid (3.48 g, 42.5 mmol) was added. The system was heated to 100 °C with stirring, and 37% formaldehyde aqueous solution (6.9 mL, 85 mmol) was slowly added dropwise over 30 min. After the addition was complete, the mixture was refluxed at 100 °C for 7 h. After the reaction was complete, the mixture was washed with water and rotary evaporated to obtain the triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor (Z2). The reaction formula is as follows: .
[0017] Example 3: A triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor and its preparation method, comprising the following steps: S1, the preparation of the triazole derivative is the same as step S1 in Example 1; S2. Preparation of the triazole-modified polyamine intermediate: A triazole derivative (3.76 g, 10 mmol), diethylenetriamine (1.23 g, 10 mmol), and 40 mL of N,N-dimethylformamide (DMF) were added sequentially to a round-bottom flask, followed by the dropwise addition of triethylamine (2.02 g, 20 mmol). Under nitrogen protection, the system was heated to 60 °C and refluxed with stirring for 6 h. After the reaction was complete, the reaction solution was purified, separated, rotary evaporated, and vacuum dried to obtain the triazole-modified polyamine intermediate, as shown in the following reaction formula: ; Preparation of Triazole-Modified Polyamine Polyphosphonic Acid Corrosion and Scale Inhibitor S3: Triazole-modified polyamine intermediate (2.88 g, 8.5 mmol), deionized water, and 6 mL of concentrated hydrochloric acid were dissolved in a three-necked flask under stirring. Then, phosphorous acid (3.13 g, 34 mmol) was added. The system was heated to 90 °C with stirring, and 6.2 mL of 37% formaldehyde aqueous solution (68 mmol) was slowly added dropwise over 30 min. After the addition was complete, the mixture was refluxed at 90 °C for 5 h. After the reaction was complete, the mixture was washed with water and rotary evaporated to obtain the triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor (Z3). The reaction formula is as follows: .
[0018] Example 4: A triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor and its preparation method, comprising the following steps: S1. Preparation of triazole derivatives: Under nitrogen protection and anhydrous conditions, 1,2,4-triazole (1.38 g, 20 mmol) was dissolved in 30 mL of N,N-dimethylformamide (DMF). Sodium hydride (0.48 g, 20 mmol) was added in portions under ice bath conditions, and the mixture was stirred until no bubbles were generated. Then, 1,16-dibromohexadecane (7.6 g, 20 mmol) was slowly added dropwise. After the addition was complete, the mixture was moved to room temperature and stirred for 15 h. After the reaction was complete, deionized water was added and the mixture was stirred vigorously for 5 min. The mixture was then extracted with an equal volume of ethyl acetate. The organic phase was collected and concentrated under reduced pressure to remove the solvent, yielding the triazole derivatives. The reaction formula is as follows: ; S2. Preparation of the triazole-modified polyamine intermediate: A triazole derivative (3.72 g, 10 mmol), tetraethylenepentamine (1.66 g, 10 mmol), and 40 mL of N,N-dimethylformamide (DMF) were added sequentially to a round-bottom flask, followed by the dropwise addition of triethylamine (1.76 g, 20 mmol). Under nitrogen protection, the system was heated to 80 °C and refluxed with stirring for 9 h. After the reaction was complete, the reaction solution was purified, separated, rotary evaporated, and vacuum dried to obtain the triazole-modified polyamine intermediate, as shown in the following reaction formula: ; Preparation of S3, Triazole-Modified Polyamine Polyphosphonic Acid Corrosion and Scale Inhibitor: Triazole-modified polyamine intermediate (3.84 g, 8.5 mmol), deionized water, and 6 mL of concentrated hydrochloric acid were dissolved in a three-necked flask under stirring. Then, phosphorous acid (3.13 g, 51 mmol) was added. The system was heated to 90 °C with stirring, and 7.5 mL of 37% formaldehyde aqueous solution (100 mmol) was slowly added dropwise over 30 min. After the addition was complete, the mixture was refluxed at 110 °C for 8 h. After the reaction was complete, the mixture was washed with water and rotary evaporated to obtain the triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor (Z4). The reaction formula is as follows: .
[0019] Example 5: A triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor and its preparation method, comprising the following steps: S1. Preparation of triazole derivatives: Under nitrogen protection and anhydrous conditions, 1,2,4-triazole (1.38 g, 20 mmol) was dissolved in 30 mL of N,N-dimethylformamide (DMF). Sodium hydride (0.48 g, 20 mmol) was added in portions under ice bath conditions, and the mixture was stirred until no bubbles were generated. Then, 1,20-dibromoeicosane (8.8 g, 20 mmol) was slowly added dropwise. After the addition was complete, the mixture was moved to room temperature and stirred for 16 h. After the reaction was complete, deionized water was added and the mixture was stirred vigorously for 5 min. The mixture was then extracted with an equal volume of ethyl acetate. The organic phase was collected and concentrated under reduced pressure to remove the solvent, yielding the triazole derivatives. The reaction formula is as follows: ; S2. Preparation of the triazole-modified polyamine intermediate: A triazole derivative (4.29 g, 10 mmol), tetraethylenepentamine (1.66 g, 10 mmol), and 40 mL of N,N-dimethylformamide (DMF) were added sequentially to a round-bottom flask, followed by the dropwise addition of triethylamine (1.76 g, 20 mmol). Under nitrogen protection, the system was heated to 80 °C and refluxed with stirring for 10 h. After the reaction was complete, the reaction solution was purified, separated, rotary evaporated, and vacuum dried to obtain the triazole-modified polyamine intermediate, as shown in the following reaction formula: ; Preparation of S3, Triazole-Modified Polyamine Polyphosphonic Acid Corrosion and Scale Inhibitor: Triazole-modified polyamine intermediate (4.3 g, 8.5 mmol), deionized water, and 6 mL of concentrated hydrochloric acid were dissolved in a three-necked flask under stirring. Then, phosphorous acid (3.13 g, 51 mmol) was added. The system was heated to 90 °C under stirring, and 7.5 mL of 37% formaldehyde aqueous solution (100 mmol) was slowly added dropwise over 30 min. After the addition was complete, the mixture was refluxed at 110 °C for 8 h. After the reaction was complete, the mixture was washed with water and rotary evaporated to obtain the triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor (Z5). The reaction formula is as follows: .
[0020] In summary, to address the problems of competitive adsorption at metal interfaces, difficulty in achieving both corrosion inhibition and scale inhibition efficiency, and poor long-term compatibility and dispersion stability in traditional physical compound systems of organophosphonic acids and nitrogen-containing heterocyclic compounds under harsh operating conditions such as oil and gas extraction and gathering, this invention provides a triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor and its preparation method. This method first prepares a triazole derivative by reacting 1,2,4-triazole, α,ω-dibromoalkane, and sodium hydride. Then, it reacts with a polyamine monomer to obtain a triazole-modified polyamine intermediate. Subsequently, this intermediate is reacted with phosphorous acid and formaldehyde to finally obtain the triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor. Through the combination of triazole heterocycles, hydrophobic long-chain alkyl groups, and polyamine polymethylphosphonic acid, the resulting agent possesses excellent anti-corrosion and scale inhibition properties. Among them, the strong coordination adsorption of the triazole ring and the hydrophobic steric hindrance of the long-chain alkyl group can construct a synergistic anti-corrosion barrier of "chemical anchoring and physical isolation" on the metal surface; while the polymethylphosphonic acid group plays a strong chelating and lattice distortion role, combined with the steric hindrance of the alkyl group, which can reduce the risk of "calcium sensitivity" and achieve efficient scale inhibition. While simplifying the dosing process, it achieves deep synergy between scale inhibition and corrosion inhibition and long-term protection.
[0021] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor, characterized in that, The triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor is obtained by reacting a triazole-modified polyamine intermediate with phosphorous acid and formaldehyde in a molar ratio of 1:4~6:8~12. The general structural formula of the triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor is as follows: ； In the formula, the value of n ranges from 12 to 20; In the formula, R is selected from one of the following structures: 。 2. The triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor according to claim 1, characterized in that, The triazole-modified polyamine intermediate is obtained by reacting a triazole derivative, a polyamine monomer, and triethylamine in a molar ratio of 1:1:
2. The general structural formula of the triazole-modified polyamine intermediate is as follows: ； In the formula, the value of n ranges from 12 to 20; In the formula, M is selected from one of the following structures: 。 3. A triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor according to claim 1 or 2, characterized in that, The triazole derivative is obtained by reacting 1,2,4-triazole, α,ω-dibromoalkane, and sodium hydride in a molar ratio of 1:1:
1. The general structural formula of the triazole derivative is as follows: ； In the formula, the value of n ranges from 12 to 20.
4. A method for preparing a triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor according to any one of claims 1-3, characterized in that, The preparation method of the triazole-modified polyamine polyphosphonic acid corrosion and scale inhibitor is as follows: S1. 1,2,4-triazole, α,ω-dibromoalkane and sodium hydride were added to a round-bottom flask, N,N-dimethylformamide was added, and the mixture was reacted at room temperature for 10-16 h. After the reaction was completed, the triazole derivative was obtained by extraction with ethyl acetate and rotary evaporation. S2. Add the triazole derivative and polyamine monomer to a round-bottom flask, add N,N-dimethylformamide, and add triethylamine as an acid-binding agent. React at 60~80℃ for 6~10h. After the reaction is completed, the intermediate of triazole modified polyamine is obtained by purification, separation, rotary evaporation, and vacuum drying. S3. Add the triazole-modified polyamine intermediate, phosphorous acid and formaldehyde to a three-necked flask, add deionized water, and then add 6 ml of concentrated hydrochloric acid. React at 90~110℃ for 5~8 h. After the reaction is completed, wash with water and rotary evaporate to obtain the triazole-modified polyamine polyphosphonic acid type corrosion and scale inhibitor.