Environment-friendly water-based antirust composition, preparation method and application thereof

Abstract

This invention belongs to the field of metal rust prevention technology, specifically relating to an environmentally friendly water-based rust-preventive composition, its preparation method, and its application. The composition comprises, by weight, 3-8 parts of a first triazine compound, 1-5 parts of a second triazine compound, 10-20 parts of 2-amino-2-methyl-1,3-propanediol, 2-5 parts of dipropylene glycol monomethyl ether, and 65-85 parts of water. The first triazine compound is a triazine compound having substituents containing hydrophobic segments and at least two aminocarboxylic acid substituents, and the second triazine compound is a triazine compound having thiol substituents. This invention forms a dual-anchored protective film on the metal surface through the two triazine compounds, exhibiting excellent salt spray resistance, damp heat resistance, and film density. It achieves a salt spray test duration of 72 hours, a damp heat test duration of 960 hours, and an adhesion rating of 0. Furthermore, it is free of nitrites, phosphates, and heavy metals. The preparation method is simple, suitable for industrial production, and can be widely applied to metal rust prevention in machinery manufacturing, automotive parts, and other fields.

Description

Technical Field

[0001] This invention belongs to the field of metal rust prevention technology, specifically relating to an environmentally friendly water-based rust-preventive composition, its preparation method, and its application. Background Technology

[0002] During use and storage, metallic materials are susceptible to chemical or electrochemical corrosion due to oxygen, moisture, and other corrosive media in the air, leading to surface rust, performance degradation, and even failure. Statistics show that annual metal losses due to corrosion account for approximately 10% to 20% of the year's steel production. Therefore, rust prevention treatment for metals plays a crucial role in numerous fields, including machinery manufacturing, automotive parts, instruments and equipment, and military applications.

[0003] Currently, metal rust prevention treatment mainly employs two categories: oil-based rust inhibitors and water-based rust inhibitors. While oil-based rust inhibitors offer good rust prevention, they require cleaning with organic solvents after application, leading to environmental pollution, poor operational safety, and high costs. In contrast, water-based rust inhibitors, using water as the dispersion medium, offer advantages such as environmental friendliness, safety, ease of cleaning, and low cost, making them a hot topic in research and application in recent years.

[0004] Existing water-based rust inhibitors mainly use carboxylic acid compounds, alkanolamine compounds, or their compound systems as rust-inhibiting components. Carboxylic acid compounds can form coordinate bonds with the metal surface through their carboxyl groups, creating an adsorption film. Alkanolamine compounds can adjust the pH of the system and react with carboxylic acid compounds to form organic amine salts, further enhancing the adsorption effect. However, these existing technologies still have the following shortcomings: For example, the performance of a single rust inhibitor is limited. When carboxylic acid rust inhibitors are used alone, the adsorption film formed on the metal surface is relatively loose, resulting in a short rust-preventing time and insufficient salt spray resistance. While alkanolamine compounds, when used alone, can provide some rust prevention, the protective film they form has weak adhesion and is prone to failure in humid and hot environments. Furthermore, the rust-preventing film of existing compound systems is not dense enough. Although combining carboxylic acid compounds with alkanolamine compounds can enhance adsorption by forming organic amine salts, its coverage of microscopic defects on the metal surface (such as grain boundaries and dislocation points) is still insufficient, allowing corrosive media to penetrate along these defects and leading to localized corrosion. Furthermore, the adhesion between the anti-rust film and the metal substrate is relatively weak; the anti-rust films formed by existing technologies are mostly physically adsorbed or weakly coordinated, and are prone to local peeling off under salt spray or humid and hot conditions, making it difficult to meet the long-term protection requirements.

[0005] Therefore, developing a water-based rust-preventive composition that can form a dense protective film on metal surfaces, has strong adhesion, and excellent rust-preventive properties has significant industrial application value and practical significance. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies, such as short rust prevention time of single rust inhibitors, insufficient density of rust-preventive films formed by compound systems, and weak adhesion to metal substrates. This invention provides an environmentally friendly water-based rust-preventive composition that uses two triazine compounds with different mechanisms of action to form a double-anchored protective film on the metal surface through synergistic effects, and has excellent salt spray resistance and damp heat resistance.

[0007] The first aspect of this invention provides an environmentally friendly water-based rust-preventive composition, prepared by comprising the following raw materials in parts by weight:

[0008] 3-8 parts of the triazine compound;

[0009] 1-5 parts of the second triazine compound;

[0010] 10-20 parts of 2-amino-2-methyl-1,3-propanediol;

[0011] 2-5 parts of dipropylene glycol monomethyl ether;

[0012] 65-85 parts water;

[0013] The first triazine compound is a triazine compound having a substituent comprising a hydrophobic segment and at least two aminocarboxylic acid substituents;

[0014] The second triazine compound is a triazine compound having a thiol substituent.

[0015] This invention provides an environmentally friendly water-based rust-preventive composition. It employs a triazine compound having substituents containing hydrophobic segments and at least two aminocarboxylic acid substituents, combined with a triazine compound having thiol substituents, and synergistically added in specific amounts of 2-amino-2-methyl-1,3-propanediol, dipropylene glycol monomethyl ether, and water. This forms a synergistic rust-preventive system capable of producing a significant effect on metal surfaces, exhibiting excellent rust-preventive performance, film density, and bonding strength. Studies have shown that the salt spray test duration can reach 72 hours, the damp heat test duration can reach 960 hours, the corrosion current density can reach 0.82 μA / cm², the adhesion is grade 0 or 1, the stacking test can reach grade 1, and the cast iron chips test can reach grade A. This invention achieves excellent rust-preventive effects through the synergistic formulation of five components, and is characterized by its simplified composition and environmental safety.

[0016] The specific research concept is as follows: the first triazine compound adsorbs onto the metal surface through coordination bonds formed by the nitrogen atom and carboxyl group of the triazine ring, while its hydrophobic substituents form a physical barrier on the metal surface; the second triazine compound forms a stronger covalent bond anchoring with the metal through its thiol group, which can fill the microscopic defects that the first rust inhibitor cannot cover; the two work synergistically to form a dual-anchoring protective film of coordination and covalent bonds, significantly improving the density and adhesion of the rust-preventive film. Simultaneously, the dihydroxyl structure of 2-amino-2-methyl-1,3-propanediol can form a hydrogen bond network with the triazine compound, further enhancing the film's density.

[0017] Furthermore, it is prepared from the following raw materials in parts by weight:

[0018] 5-7 parts of the triazine compound;

[0019] 2-3 parts of the second triazine compound;

[0020] 12-18 parts of 2-amino-2-methyl-1,3-propanediol;

[0021] 3-4 parts of dipropylene glycol monomethyl ether;

[0022] 70-80 parts water.

[0023] Furthermore, the first triazine compound was prepared by the following method, with the raw materials in parts by weight:

[0024] S1. Mix 1 part of cyanuric chloride with 8-12 parts of acetone, stir to dissolve, and form a reaction system. Control the reaction temperature at 0-5℃.

[0025] Dissolve 0.6-0.8 parts of 6-hydroxyhexylamine in 1-2 parts of acetone and slowly add it dropwise to the reaction system; at the same time, add an alkaline solution to maintain the pH of the reaction system at 6-7.

[0026] Continue stirring the reaction at 0-5℃ for 1-3 h to obtain intermediate I reaction solution.

[0027] S2. Heat the reaction solution from step 1 to 25-30℃; add 0.8-1.0 parts by weight of 6-aminocaproic acid in batches, each time adding 0.1-0.2 parts by weight, with an interval of 5-10 minutes, while simultaneously adding alkaline solution to maintain pH 6-7.

[0028] After the addition of materials is complete, stir the reaction at 25~30℃ for 3~4 h to obtain intermediate II reaction solution;

[0029] S3. Heat the reaction solution from step 2 to 50-55℃; add 0.8-1.0 parts by weight of 6-aminohexanoic acid in batches, while simultaneously adding alkaline solution to maintain pH 7-8; stir the reaction at 50-55℃ for 4-5 hours.

[0030] S4. Acetone was recovered by vacuum distillation. The remaining aqueous phase was cooled to room temperature, and hydrochloric acid was slowly added dropwise to adjust the pH to 3-4, causing solid to precipitate. The solid was filtered, the filter cake was washed 2-3 times with deionized water, and dried to obtain the first triazine compound.

[0031] Furthermore, in S1, the alkaline solution is slowly added dropwise to the reaction system over a period of 30-45 minutes; and / or, the alkaline solution is a sodium hydroxide solution with a mass concentration of 8%-12%.

[0032] Furthermore, the second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

[0033] Furthermore, the total amount of the first triazine compound and the second triazine compound is in a weight ratio of 1:1.5-2.5 to 2-amino-2-methyl-1,3-propanediol.

[0034] Furthermore, the total amount of the first triazine compound and the second triazine compound is in a weight ratio of 1:1.7-1.8 to 2-amino-2-methyl-1,3-propanediol.

[0035] A second aspect of the present invention provides a method for preparing the environmentally friendly water-based rust-inhibiting composition as described above, comprising the following steps:

[0036] Step 1: Under stirring, the first and second triazine compounds are slowly added to 2-amino-2-methyl-1,3-propanediol, the temperature is raised, and the reaction is stirred to obtain mixture A;

[0037] Step 2: Cool the mixture A obtained in Step 1 to below 40°C, add 30-40% of the formula amount of water, stir, and obtain mixture B;

[0038] Step 3: Add dipropylene glycol monomethyl ether and the remaining amount of water to mixture B obtained in step 2, stir, and let stand to obtain an environmentally friendly water-based rust-preventive composition.

[0039] Furthermore, in step 1, the temperature is raised to 55℃-60℃, and the stirring reaction time is 1-2 hours.

[0040] The third aspect of the present invention provides the application of the environmentally friendly water-based rust-preventive composition as described above or the environmentally friendly water-based rust-preventive composition prepared by the preparation method described above in the rust prevention treatment of metal materials.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0042] This invention provides an environmentally friendly water-based rust-preventive composition. It employs a triazine compound having substituents containing hydrophobic segments and at least two aminocarboxylic acid substituents, combined with a triazine compound having thiol substituents, and synergistically added in specific amounts of 2-amino-2-methyl-1,3-propanediol, dipropylene glycol monomethyl ether, and water. This forms a synergistic rust-preventive system capable of producing a significant effect on metal surfaces, exhibiting excellent rust-preventive performance, film density, and bonding strength. Studies have shown that the salt spray test duration can reach 72 hours, the damp heat test duration can reach 960 hours, the corrosion current density can reach 0.82 μA / cm², the adhesion is grade 0 or 1, the stacking test can reach grade 1, and the cast iron chips test can reach grade A. This invention achieves excellent rust-preventive effects through the synergistic formulation of five components, and is characterized by its simplified composition and environmental safety.

[0043] 2. The preparation method of the environmentally friendly water-based rust-preventive composition provided by this invention, through specific feeding sequence and process parameter control, can ensure sufficient reaction and stable dispersion of each component, thereby obtaining a rust-preventive product with excellent performance and stable quality. In step 1, the first and second triazine compounds are slowly added to 2-amino-2-methyl-1,3-propanediol and the temperature is raised to allow the two triazine compounds to fully contact and react with the special amine to form an amine salt complex, laying the foundation for the subsequent formation of a dense rust-preventive film. In step 2, the reaction system is cooled to below 40°C and then some water is added to prevent hydrolysis or side reactions caused by adding water at high temperature, while also initially homogenizing the system. In step 3, the film-forming agent and the remaining water are added and stirred at room temperature to allow the components to fully integrate and form a stable homogeneous system. This preparation method requires no special equipment or complex operation, the reaction conditions are mild, the process is highly controllable, and it is suitable for large-scale industrial production.

[0044] 3. This invention provides the application of an environmentally friendly water-based rust-preventive composition and its preparation method in rust prevention treatment of metal materials. By applying the rust-preventive composition with specific composition and ratio to the metal surface, a dual protective film with both chemical adsorption and physical barrier properties can be formed in situ on the surface, thereby achieving efficient and long-lasting protection for the metal material. This invention requires no additional additives and can form a uniform and dense protective film on the surface of various metal materials (such as carbon steel and cast iron). The processing technology is simple and suitable for various construction methods such as immersion and brushing. It features environmental safety, low cost, and excellent rust prevention effect, and can be widely used in metal rust prevention treatment in fields such as machinery manufacturing, automotive parts, instruments and equipment, and military industry, possessing significant industrial application value. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0046] The first aspect of this embodiment provides an environmentally friendly water-based rust-preventive composition, which is prepared from the following raw materials in parts by weight:

[0047] 3-8 parts of the triazine compound;

[0048] 1-5 parts of the second triazine compound;

[0049] 10-20 parts of 2-amino-2-methyl-1,3-propanediol;

[0050] 2-5 parts of dipropylene glycol monomethyl ether;

[0051] 65-85 parts water;

[0052] The first triazine compound is a triazine compound having a substituent comprising a hydrophobic segment and at least two aminocarboxylic acid substituents;

[0053] The second triazine compound is a triazine compound having a thiol substituent.

[0054] This invention provides an environmentally friendly water-based rust-preventive composition. It employs a triazine compound having substituents containing hydrophobic segments and at least two aminocarboxylic acid substituents, combined with a triazine compound having thiol substituents, and synergistically added in specific amounts of 2-amino-2-methyl-1,3-propanediol, dipropylene glycol monomethyl ether, and water. This forms a synergistic rust-preventive system capable of producing a significant effect on metal surfaces, exhibiting excellent rust-preventive performance, film density, and bonding strength. Studies have shown that the salt spray test duration can reach 72 hours, the damp heat test duration can reach 960 hours, the corrosion current density can reach 0.82 μA / cm², the adhesion is grade 0 or 1, the stacking test can reach grade 1, and the cast iron chips test can reach grade A. This invention achieves excellent rust-preventive effects through the synergistic formulation of five components, and is characterized by its simplified composition and environmental safety.

[0055] The specific research concept is as follows: the first triazine compound adsorbs onto the metal surface through coordination bonds formed by the nitrogen atom and carboxyl group of the triazine ring, while its hydrophobic substituents form a physical barrier on the metal surface; the second triazine compound forms a stronger covalent bond anchoring with the metal through its thiol group, which can fill the microscopic defects that the first rust inhibitor cannot cover; the two work synergistically to form a dual-anchoring protective film of coordination and covalent bonds, significantly improving the density and adhesion of the rust-preventive film. Simultaneously, the dihydroxyl structure of 2-amino-2-methyl-1,3-propanediol can form a hydrogen bond network with the triazine compound, further enhancing the film's density.

[0056] In one or more embodiments, the preparation comprises, by weight, the following raw materials:

[0057] 5-7 parts of the triazine compound;

[0058] 2-3 parts of the second triazine compound;

[0059] 12-18 parts of 2-amino-2-methyl-1,3-propanediol;

[0060] 3-4 parts of dipropylene glycol monomethyl ether;

[0061] 70-80 parts water.

[0062] The study found that the above-mentioned preferred weight range further optimized the synergistic effect among the components.

[0063] In one or more embodiments, the first triazine compound was prepared by the following method, with the raw materials in parts by weight:

[0064] S1. Mix 1 part of cyanuric chloride with 8-12 parts of acetone, stir to dissolve, and form a reaction system. Control the reaction temperature at 0-5℃.

[0065] Dissolve 0.6-0.8 parts of 6-hydroxyhexylamine in 1-2 parts of acetone and slowly add it dropwise to the reaction system; at the same time, add an alkaline solution to maintain the pH of the reaction system at 6-7.

[0066] Continue stirring the reaction at 0-5℃ for 1-3 h to obtain intermediate I reaction solution.

[0067] S2. Heat the reaction solution from step 1 to 25-30℃; add 0.8-1.0 parts by weight of 6-aminocaproic acid in batches, each time adding 0.1-0.2 parts by weight, with an interval of 5-10 minutes, while simultaneously adding alkaline solution to maintain pH 6-7.

[0068] After the addition of materials is complete, stir the reaction at 25~30℃ for 3~4 h to obtain intermediate II reaction solution;

[0069] S3. Heat the reaction solution from step 2 to 50-55℃; add 0.8-1.0 parts by weight of 6-aminohexanoic acid in batches, while simultaneously adding alkaline solution to maintain pH 7-8; stir the reaction at 50-55℃ for 4-5 hours.

[0070] S4. Acetone was recovered by vacuum distillation. The remaining aqueous phase was cooled to room temperature, and hydrochloric acid was slowly added dropwise to adjust the pH to 3-4, causing a solid to precipitate. The solid was filtered, the filter cake was washed 2-3 times with deionized water, and dried to obtain the triazine compound.

[0071] By employing the aforementioned specific stepwise substitution method to prepare the first triazine compound, the selective substitution of the three chlorine atoms on cyanuric chloride can be more precisely controlled, ensuring the structural clarity and purity of the target product. Specifically, in step S1, the first chlorine atom is selectively substituted at a low temperature of 0-5℃, introducing a 6-hydroxyhexyl group into the triazine ring to provide a hydrophobic hexyl structure for the compound; in step S2, the temperature is raised to 25-30℃ to selectively substitute the second chlorine atom, introducing the first 6-aminohexanoic acid group; in step S3, the temperature is raised to 50-55℃ to selectively substitute the third chlorine atom, introducing the second 6-aminohexanoic acid group, ultimately forming a specific structure with one hydrophobic hexyl group and two aminocarboxylic acid substituents. This preparation method is simple to operate, has mild reaction conditions, and the solvent acetone can be recycled, meeting green environmental protection requirements and suitable for industrial production.

[0072] In one or more embodiments, in S1, the reaction system is slowly added dropwise over a period of 30-45 minutes; and / or, the alkaline solution is a sodium hydroxide solution with a mass concentration of 8%-12%.

[0073] In one or more embodiments, the second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

[0074] In one or more embodiments, the combined amount of the first triazine compound and the second triazine compound is in a weight ratio of 1:1.5-2.5 to 2-amino-2-methyl-1,3-propanediol.

[0075] Studies have found that the total weight ratio of the first and second triazine compounds to 2-amino-2-methyl-1,3-propanediol is a key factor affecting the performance of the rust-inhibiting composition. Preferably, the weight ratio of the total weight of the first and second triazine compounds to 2-amino-2-methyl-1,3-propanediol is 1:1.7-1.8.

[0076] The second aspect of this embodiment provides a method for preparing the environmentally friendly water-based rust-inhibiting composition as described above, comprising the following steps:

[0077] Step 1: Under stirring, the first and second triazine compounds are slowly added to 2-amino-2-methyl-1,3-propanediol, the temperature is raised, and the reaction is stirred to obtain mixture A;

[0078] Step 2: Cool the mixture A obtained in Step 1 to below 40°C, add 30-40% of the formula amount of water, stir, and obtain mixture B;

[0079] Step 3: Add dipropylene glycol monomethyl ether and the remaining amount of water to mixture B obtained in step 2, stir, and let stand to obtain an environmentally friendly water-based rust-preventive composition.

[0080] The method for preparing the environmentally friendly water-based rust-preventive composition provided by this invention, through specific feeding sequence and process parameter control, ensures sufficient reaction and stable dispersion of each component, thereby obtaining a rust-preventive product with excellent performance and stable quality. In step 1, the first and second triazine compounds are slowly added to 2-amino-2-methyl-1,3-propanediol and the temperature is raised to allow the two triazine compounds to fully contact and react with the special amine to form an amine salt complex, laying the foundation for the subsequent formation of a dense rust-preventive film. In step 2, the reaction system is cooled to below 40°C and then some water is added to prevent hydrolysis or side reactions caused by high-temperature water addition, while also initially homogenizing the system. In step 3, the film-forming agent and remaining water are added and stirred at room temperature, allowing the components to fully integrate and form a stable homogeneous system. This preparation method requires no special equipment or complex operations, has mild reaction conditions, and strong process controllability, making it suitable for large-scale industrial production.

[0081] In one or more embodiments, in step 1, the temperature is raised to 55°C-60°C, and the stirring reaction time is 1-2 hours.

[0082] The third aspect of this embodiment provides the application of the environmentally friendly water-based rust-preventive composition as described above or the environmentally friendly water-based rust-preventive composition prepared by the preparation method described above in the rust prevention treatment of metal materials.

[0083] This invention provides an environmentally friendly water-based rust-preventive composition and its preparation method for use in rust prevention treatment of metal materials. By applying the rust-preventive composition with specific composition and ratio to the metal surface, a dual protective film with both chemical adsorption and physical barrier properties can be formed in situ on the surface, thereby achieving efficient and long-lasting protection for the metal material. This invention requires no additional additives and can form a uniform and dense protective film on the surface of various metal materials (such as carbon steel and cast iron). The process is simple and suitable for various construction methods such as immersion and brushing. It features environmental safety, low cost, and excellent rust prevention effect, and can be widely used in metal rust prevention treatment in fields such as machinery manufacturing, automotive parts, instruments and equipment, and military industry, possessing significant industrial application value.

[0084] To better understand the above technical solutions, the following more detailed implementation examples are provided for further explanation.

[0085] Example 1

[0086] Preparation of triazine compounds

[0087] Mix 1 part cyanuric chloride with 10 parts acetone, stir to dissolve, and control the reaction temperature at 0-5℃. Dissolve 0.7 parts 6-hydroxyhexylamine in 1.5 parts acetone and slowly add it dropwise to the reaction system over 35 minutes; simultaneously, add 10% sodium hydroxide solution to maintain the pH at 6-7. After the addition is complete, continue stirring at 0-5℃ for 2 hours to obtain intermediate I reaction solution.

[0088] Heat the reaction solution from step 1 to 28°C; add 0.9 parts of 6-aminocaproic acid in batches, each time adding 0.15 parts at 8-minute intervals, while simultaneously adding 10% sodium hydroxide solution to maintain pH 6-7; after the addition is complete, stir the reaction at 28°C for 3.5 hours to obtain intermediate II reaction solution.

[0089] Heat the reaction solution from step 2 to 52°C; add 0.9 parts of 6-aminohexanoic acid in batches, while simultaneously adding 10% sodium hydroxide solution to maintain pH 7-8; stir the reaction at 52°C for 4.5 hours.

[0090] Acetone was recovered by vacuum distillation. The remaining aqueous phase was cooled to room temperature, and 10% hydrochloric acid was slowly added dropwise to adjust the pH to 3-4, causing a solid to precipitate. The solid was filtered, washed three times with deionized water, and dried under vacuum at 50°C for 10 hours to obtain the triazine compound.

[0091] Preparation of environmentally friendly water-based rust-preventive compositions

[0092] Raw materials: By weight, it includes the following raw materials:

[0093] First triazine compound: 6 parts; Second triazine compound: 2.5 parts; 2-amino-2-methyl-1,3-propanediol: 15 parts; Dipropylene glycol monomethyl ether: 3 parts; Deionized water: 73.5 parts;

[0094] The first triazine compound is 2-(6-hydroxyhexyl)-4,6-bis(6-aminohexanoic acid)-1,3,5-triazine, prepared by the method described above. The second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

[0095] Preparation of environmentally friendly water-based rust-inhibiting composition:

[0096] Step 1: Add 2-amino-2-methyl-1,3-propanediol to the reaction vessel, and slowly add the first and second triazine compounds while stirring. Heat to 58°C and stir for 1 hour to obtain mixture A.

[0097] Step 2: Cool mixture A to 35°C, add 35% of the formula amount of deionized water, stir for 15 minutes to obtain mixture B.

[0098] Step 3: Add dipropylene glycol monomethyl ether and the remaining deionized water to mixture B, stir at room temperature for 30 minutes, let stand to defoam, filter and discharge to obtain an environmentally friendly water-based rust-preventive composition.

[0099] Example 2

[0100] Preparation of triazine compounds

[0101] Mix 1 part cyanuric chloride with 12 parts acetone, stir to dissolve, and control the reaction temperature at 0-5℃. Dissolve 0.8 parts 6-hydroxyhexylamine in 2 parts acetone and slowly add it dropwise to the reaction system over 35 minutes; simultaneously, add 10% sodium hydroxide solution to maintain pH 6-7. After the addition is complete, continue stirring at 0-5℃ for 3 hours to obtain intermediate I reaction solution.

[0102] Heat the reaction solution from step 1 to 30°C; add 1 part of 6-aminocaproic acid in batches, 0.2 parts each time, with an interval of 10 minutes, while simultaneously adding 10% sodium hydroxide solution to maintain pH 6-7; after the addition is complete, stir the reaction at 30°C for 3 hours to obtain intermediate II reaction solution.

[0103] Heat the reaction solution from step 2 to 55°C; add 1 part of 6-aminocaproic acid in batches, while simultaneously adding 10% sodium hydroxide solution to maintain pH 7-8; stir the reaction at 55°C for 4 hours.

[0104] Acetone was recovered by vacuum distillation. The remaining aqueous phase was cooled to room temperature, and 10% hydrochloric acid was slowly added dropwise to adjust the pH to 3-4, causing a solid to precipitate. The solid was filtered, washed three times with deionized water, and dried under vacuum at 50°C for 10 hours to obtain the triazine compound.

[0105] Preparation of environmentally friendly water-based rust-preventive compositions

[0106] Raw materials: By weight, it includes the following raw materials:

[0107] First triazine compound: 8 parts; Second triazine compound: 5 parts; 2-amino-2-methyl-1,3-propanediol: 20 parts; Dipropylene glycol monomethyl ether: 5 parts; Deionized water: 85 parts;

[0108] The first triazine compound is 2-(6-hydroxyhexyl)-4,6-bis(6-aminohexanoic acid)-1,3,5-triazine, prepared by the method described above. The second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

[0109] Preparation of environmentally friendly water-based rust-inhibiting composition:

[0110] Step 1: Add 2-amino-2-methyl-1,3-propanediol to the reaction vessel, and slowly add the first and second triazine compounds while stirring. Heat to 60°C and stir for 1 hour to obtain mixture A.

[0111] Step 2: Cool mixture A to 35°C, add 40% of the formula amount of deionized water, stir for 15 minutes to obtain mixture B.

[0112] Step 3: Add dipropylene glycol monomethyl ether and the remaining deionized water to mixture B, stir at room temperature for 30 minutes, let stand to defoam, filter and discharge to obtain an environmentally friendly water-based rust-preventive composition.

[0113] Example 3

[0114] Preparation of triazine compounds

[0115] Mix 1 part cyanuric chloride with 8 parts acetone, stir to dissolve, and control the reaction temperature at 0-5℃. Dissolve 0.6 parts 6-hydroxyhexylamine in 1 part acetone and slowly add it dropwise to the reaction system over 35 minutes; simultaneously, add 10% sodium hydroxide solution to maintain pH 6-7. After the addition is complete, continue stirring at 0-5℃ for 2 hours to obtain intermediate I reaction solution.

[0116] Heat the reaction solution from step 1 to 25°C; add 0.8 parts of 6-aminocaproic acid in batches, 0.1 parts each time, with an interval of 5 minutes, while simultaneously adding 10% sodium hydroxide solution to maintain pH 6-7; after the addition is complete, stir the reaction at 25°C for 4 hours to obtain intermediate II reaction solution.

[0117] Heat the reaction solution from step 2 to 50°C; add 0.8 parts of 6-aminocaproic acid in batches, while simultaneously adding 10% sodium hydroxide solution to maintain pH 7-8; stir the reaction at 50°C for 5 hours.

[0118] Acetone was recovered by vacuum distillation. The remaining aqueous phase was cooled to room temperature, and 10% hydrochloric acid was slowly added dropwise to adjust the pH to 3-4, causing a solid to precipitate. The solid was filtered, washed three times with deionized water, and dried under vacuum at 50°C for 10 hours to obtain the triazine compound.

[0119] Preparation of environmentally friendly water-based rust-preventive compositions

[0120] Raw materials: By weight, it includes the following raw materials:

[0121] First triazine compound: 3 parts; Second triazine compound: 1 part; 2-amino-2-methyl-1,3-propanediol: 10 parts; Dipropylene glycol monomethyl ether: 2 parts; Deionized water: 65 parts;

[0122] The first triazine compound is 2-(6-hydroxyhexyl)-4,6-bis(6-aminohexanoic acid)-1,3,5-triazine, prepared by the method described above. The second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

[0123] Preparation of environmentally friendly water-based rust-inhibiting composition:

[0124] Step 1: Add 2-amino-2-methyl-1,3-propanediol to the reaction vessel, and slowly add the first and second triazine compounds while stirring. Heat to 55°C and stir for 2 hours to obtain mixture A.

[0125] Step 2: Cool mixture A to 35°C, add 40% of the formula amount of deionized water, stir for 15 minutes to obtain mixture B.

[0126] Step 3: Add dipropylene glycol monomethyl ether and the remaining deionized water to mixture B, stir at room temperature for 30 minutes, let stand to defoam, filter and discharge to obtain an environmentally friendly water-based rust-preventive composition.

[0127] Example 4

[0128] Example 4 uses the same method as Example 1 to prepare the first triazine compound.

[0129] Preparation of environmentally friendly water-based rust-preventive compositions

[0130] Raw materials: By weight, it includes the following raw materials:

[0131] First triazine compound: 5 parts; Second triazine compound: 2 parts; 2-amino-2-methyl-1,3-propanediol: 12 parts; Dipropylene glycol monomethyl ether: 3 parts; Deionized water: 70 parts;

[0132] The first triazine compound is 2-(6-hydroxyhexyl)-4,6-bis(6-aminohexanoic acid)-1,3,5-triazine, prepared by the method described above. The second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

[0133] Preparation of environmentally friendly water-based rust-inhibiting composition:

[0134] Step 1: Add 2-amino-2-methyl-1,3-propanediol to the reaction vessel, and slowly add the first and second triazine compounds while stirring. Heat to 58°C and stir for 1 hour to obtain mixture A.

[0135] Step 2: Cool mixture A to 35°C, add 35% of the formula amount of deionized water, stir for 15 minutes to obtain mixture B.

[0136] Step 3: Add dipropylene glycol monomethyl ether and the remaining deionized water to mixture B, stir at room temperature for 30 minutes, let stand to defoam, filter and discharge to obtain an environmentally friendly water-based rust-preventive composition.

[0137] Example 5

[0138] Example 5 uses the same method as Example 1 to prepare the first triazine compound.

[0139] Preparation of environmentally friendly water-based rust-preventive compositions

[0140] Raw materials: By weight, it includes the following raw materials:

[0141] First triazine compound: 7 parts; Second triazine compound: 3 parts; 2-amino-2-methyl-1,3-propanediol: 18 parts; Dipropylene glycol monomethyl ether: 4 parts; Deionized water: 80 parts;

[0142] The first triazine compound is 2-(6-hydroxyhexyl)-4,6-bis(6-aminohexanoic acid)-1,3,5-triazine, prepared by the method described above. The second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

[0143] Preparation of environmentally friendly water-based rust-inhibiting composition:

[0144] Step 1: Add 2-amino-2-methyl-1,3-propanediol to the reaction vessel, and slowly add the first and second triazine compounds while stirring. Heat to 58°C and stir for 1 hour to obtain mixture A.

[0145] Step 2: Cool mixture A to 35°C, add 35% of the formula amount of deionized water, stir for 15 minutes to obtain mixture B.

[0146] Step 3: Add dipropylene glycol monomethyl ether and the remaining deionized water to mixture B, stir at room temperature for 30 minutes, let stand to defoam, filter and discharge to obtain an environmentally friendly water-based rust-preventive composition.

[0147] Comparative Example 1

[0148] Comparative Example 1 prepared the first triazine compound using the same method as in Example 1.

[0149] Compared to Example 1, Comparative Example 1 used only the first triazine compound and did not add the second triazine compound.

[0150] Specifically, the raw materials of the environmentally friendly water-based rust-preventive composition in Comparative Example 1 include: by weight,

[0151] First triazine compound: 8.5 parts; 2-amino-2-methyl-1,3-propanediol: 15 parts; dipropylene glycol monomethyl ether: 3 parts; deionized water: 73.5 parts;

[0152] The first triazine compound is 2-(6-hydroxyhexyl)-4,6-bis(6-aminohexanoic acid)-1,3,5-triazine, which was prepared by the above method.

[0153] Preparation of environmentally friendly water-based rust-inhibiting composition:

[0154] Step 1: Add 2-amino-2-methyl-1,3-propanediol to the reaction vessel, slowly add the first triazine compound while stirring, heat to 58°C, and stir for 1 hour to obtain mixture A.

[0155] Step 2: Cool mixture A to 35°C, add 35% of the formula amount of deionized water, stir for 15 minutes to obtain mixture B.

[0156] Step 3: Add dipropylene glycol monomethyl ether and the remaining deionized water to mixture B, stir at room temperature for 30 minutes, let stand to defoam, filter and discharge to obtain an environmentally friendly water-based rust-preventive composition.

[0157] Comparative Example 2

[0158] Compared to Example 1, Comparative Example 2 used only the second triazine compound and did not add the first triazine compound.

[0159] Specifically, the raw materials of the environmentally friendly water-based rust-preventive composition in Comparative Example 2 include: by weight,

[0160] Second triazine compound: 8.5 parts; 2-amino-2-methyl-1,3-propanediol: 15 parts; dipropylene glycol monomethyl ether: 3 parts; deionized water: 73.5 parts;

[0161] The second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

[0162] Preparation of environmentally friendly water-based rust-inhibiting composition:

[0163] Step 1: Add 2-amino-2-methyl-1,3-propanediol to the reaction vessel, slowly add the second triazine compound while stirring, heat to 58°C, and stir for 1 hour to obtain mixture A.

[0164] Step 2: Cool mixture A to 35°C, add 35% of the formula amount of deionized water, stir for 15 minutes to obtain mixture B.

[0165] Step 3: Add dipropylene glycol monomethyl ether and the remaining deionized water to mixture B, stir at room temperature for 30 minutes, let stand to defoam, filter and discharge to obtain an environmentally friendly water-based rust-preventive composition.

[0166] Comparative Example 3

[0167] Compared to Example 1, Comparative Example 3 did not contain 2-amino-2-methyl-1,3-propanediol.

[0168] Comparative Example 3 used the same method as Example 1 to prepare the first triazine compound.

[0169] Preparation of environmentally friendly water-based rust-preventive compositions

[0170] Raw materials: By weight, it includes the following raw materials:

[0171] First triazine compound: 6 parts; Second triazine compound: 2.5 parts; Dipropylene glycol monomethyl ether: 3 parts; Deionized water: 85.5 parts; The second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

[0172] Preparation of environmentally friendly water-based rust-inhibiting composition:

[0173] Step 1: Add the first triazine compound and the second triazine compound to 20% of the formula amount of deionized water, stir evenly, heat to 58°C, keep warm and stir for 1 hour to obtain mixture A.

[0174] Step 2: Cool mixture A to below 40°C, add 35% of the formula amount of deionized water, and stir until homogeneous.

[0175] Step 3: Add dipropylene glycol monomethyl ether and the remaining deionized water to mixture B, stir at room temperature for 30 minutes, let stand to defoam, filter and discharge to obtain the rust-preventive composition.

[0176] Comparative Example 4

[0177] Comparative Example 4 used the same method as Example 1 to prepare the first triazine compound. The difference was that the amount of each raw material added was changed in Comparative Example 4, while the preparation process of the composition was completely consistent with Example 1.

[0178] Specifically, the raw materials of the rust-preventive composition in Comparative Example 4 include, by weight,

[0179] First triazine compound: 10 parts; Second triazine compound: 6 parts; 2-amino-2-methyl-1,3-propanediol: 7 parts; Dipropylene glycol monomethyl ether: 3 parts; Deionized water: 74 parts.

[0180] Comparative Example 5

[0181] Comparative Example 5 used the same method as Example 1 to prepare the first triazine compound. The difference was that the amount of each raw material added was changed in Comparative Example 5, but the preparation process of the composition was completely consistent with that of Example 1.

[0182] Specifically, the raw materials of the rust-preventive composition in Comparative Example 5 include, by weight,

[0183] First triazine compound: 2 parts; Second triazine compound: 10 parts; 2-amino-2-methyl-1,3-propanediol: 8 parts; Dipropylene glycol monomethyl ether: 5 parts; Deionized water: 75 parts.

[0184] Comparative Example 6

[0185] Comparative Example 6 differs from Example 1 in that the preparation process of the first triazine compound was modified.

[0186] The preparation process is as follows:

[0187] Mix 1 part cyanuric chloride with 10 parts acetone, stir to dissolve, and control the reaction temperature at 0-5℃. Dissolve 0.7 parts 6-hydroxyhexylamine in 1.5 parts acetone and slowly add it dropwise to the reaction system over 35 minutes; simultaneously, add 10% sodium hydroxide solution to maintain the pH at 6-7. After the addition is complete, continue stirring at 0-5℃ for 2 hours to obtain intermediate I reaction solution.

[0188] Heat the reaction solution from step 1 to 28°C; add 0.9 parts of 6-aminocaproic acid in batches, each time adding 0.15 parts at 8-minute intervals, while simultaneously adding 10% sodium hydroxide solution to maintain pH 6-7; after the addition is complete, stir the reaction at 28°C for 3.5 hours.

[0189] Acetone was recovered by vacuum distillation. The remaining aqueous phase was cooled to room temperature, and 10% hydrochloric acid was slowly added dropwise to adjust the pH to 3-4, causing a solid to precipitate. The solid was filtered, washed three times with deionized water, and dried under vacuum at 50°C for 10 hours to obtain the triazine compound.

[0190] The addition and preparation process of each raw material in the environmentally friendly water-based rust-preventive composition of Comparative Example 6 are completely consistent with those in Example 1.

[0191] Comparative Example 7

[0192] Compared to Example 1, Comparative Example 7 replaced 2-amino-2-methyl-1,3-propanediol with triethanolamine. The other raw materials, dosages, and preparation process of the rust-inhibiting composition were completely consistent with Example 1.

[0193] Comparative Example 8

[0194] Comparative Example 8 used commercially available tricarboxylic acid rust inhibitor CP-85 (or CP-50) as the first triazine compound, whose active ingredient is 6,6',6''-(1,3,5-triazine-2,4,6-trimethyltriimino)trihexanoic acid (CAS No.: 80584-91-4).

[0195] Obtaining the triazine compound:

[0196] Commercially available tricarboxylic acid rust inhibitor CP-85 (85% solid content) was used directly. Based on the solid content, 6 parts of the active ingredient were weighed out for use. For ease of comparison with Example 1, this comparative example uses a 100% pure product as the active ingredient for calculation.

[0197] Preparation of environmentally friendly water-based rust-inhibiting composition:

[0198] Raw materials: By weight, it includes the following raw materials:

[0199] First triazine compound: 6 parts; Second triazine compound (2,4,6-trimercapto-1,3,5-triazine): 2.5 parts; 2-amino-2-methyl-1,3-propanediol: 15 parts; Dipropylene glycol monomethyl ether: 3 parts; Deionized water: 73.5 parts.

[0200] Preparation method:

[0201] 2-Amino-2-methyl-1,3-propanediol was added to a reaction vessel, and the first and second triazine compounds were slowly added with stirring. The temperature was raised to 58°C, and the reaction was stirred for 1 hour to obtain mixture A.

[0202] Cool mixture A to 35°C, add 35% of the formula amount of deionized water, and stir for 15 minutes to obtain mixture B.

[0203] Add dipropylene glycol monomethyl ether and the remaining deionized water to mixture B, stir at room temperature for 30 minutes, let stand to defoam, filter and discharge to obtain the rust-preventive composition.

[0204] test

[0205] The performance of the rust-preventive compositions prepared in Examples 1-5 and Comparative Examples 1-8 was tested, and the test results are shown in Table 1. The specific test procedures are as follows:

[0206] Test 1 Salt spray test

[0207] Test standard: GB / T 10125-2012 "Artificial Atmosphere Corrosion Test - Salt Spray Test";

[0208] Test conditions:

[0209] Test solution: 5% sodium chloride solution, pH 6.5~7.2; Test temperature: 35℃±2℃; Spraying method: continuous spraying; Sample preparation: Q235 carbon steel sheet (50mm×50mm×2mm), after sanding, degreasing with acetone, and cleaning with deionized water, is dipped in the rust-preventive composition to be tested and air-dried at room temperature for 24 hours; Number of samples: 3 parallel samples per group; Evaluation method: Observe once a day and record the time (in hours) when the first rust spot appears on each sample, and take the average value of 3 samples.

[0210] Test 2: Damp Heat Test

[0211] Test standard: GB / T 2361-1992 "Rust-preventive greases - Damp heat test method";

[0212] Test conditions:

[0213] Test temperature: 49℃±1℃; relative humidity: ≥95%; sample preparation: same as salt spray test; number of samples: 3 parallel samples per group; evaluation method: observe once a day, record the time (in hours) when rust appears on each sample, and take the average value of 3 samples.

[0214] Testing the corrosion current density

[0215] Test standard: GB / T 24196-2009 "Guidelines for Electrochemical Test Methods for Corrosion of Metals and Alloys: Measurement of Potentiostatic and Potentiodynamic Polarization";

[0216] Test conditions:

[0217] Test instrument: Electrochemical workstation (e.g., CHI660E); Electrolyte: 3.5% NaCl solution; Working electrode: Q235 carbon steel electrode (1 cm² area), after sanding and cleaning, dipped in the rust-preventive composition to be tested, and air-dried at room temperature for 24 hours; Reference electrode: Saturated calomel electrode (SCE); Auxiliary electrode: Platinum electrode; Scan range: ±250 mV relative to open circuit potential; Scan rate: 0.5 mV / s; Test temperature: Room temperature (25℃±2℃); Data processing: Corrosion current density icorr (μA / cm²) was calculated using the Tafel extrapolation method, and the average value of 3 parallel samples in each test group was taken.

[0218] Test 4 Adhesion Test

[0219] Test standard: GB / T 9286-2021 "Cross-cut test for paints and varnishes";

[0220] Test conditions:

[0221] Sample preparation: Q235 carbon steel sheet (100mm×50mm×2mm), dipped in the rust-preventive composition to be tested, and air-dried at room temperature for 24 hours; Test tool: cross-cutting tool (1mm blade spacing); Test method: Draw a grid (6×6 squares) on the coating surface, stick it with special tape and then peel it off; Rating standards: Grade 0 (completely smooth cut edges, no squares peeled off); Grade 1 (a small amount of coating peeled off at the intersections, affected area ≤5%); Grade 2 (coating peeled off along the edge, affected area 5%~15%); Grade 3 (partial or complete peeling off along the edge in large fragments, affected area 15%~35%); Grade 4 (peeling off along the edge in large fragments, affected area 35%~65%); Grade 5 (peeling area >65%).

[0222] Five-layer test

[0223] Test standard: JB / T 6074-2018 "Rust-preventive oil stack test method";

[0224] Test conditions:

[0225] Sample preparation: Q235 carbon steel sheet (60mm×40mm×2mm), dipped in the rust-preventive composition to be tested, and air-dried at room temperature for 24 hours; Test method: two rust-preventive coated samples are stacked face to face, fixed with clamps, and placed in a humid environment; Test temperature: 49℃±1℃; Relative humidity: ≥95%; Test time: 168 hours (7 days); Rating standards: Grade 1 (no rust); Grade 2 (slight rust, area ≤5%); Grade 3 (significant rust, area 5%~20%); Grade 4 (severe rust, area 20%~50%); Grade 5 (extremely severe rust, area >50%).

[0226] Test 6: Cast Iron Chips Test

[0227] Test standard: Appendix A of GB / T 6144-2010 "Synthetic Cutting Fluids" (Test method for cast iron chips);

[0228] Test conditions:

[0229] Cast iron filings: HT200 gray cast iron filings, 2~4mm in size, degreased with acetone; Test method: Weigh 5g of cast iron filings into a petri dish, add 2mL of the rust-inhibiting composition to be tested, shake well, spread evenly, cover with filter paper, and place in a humid environment; Test temperature: 55℃±2℃; Test time: 24 hours; Rating standards: Grade A (no rust); Grade B (slight rust, area ≤5%); Grade C (significant rust, area 5%~20%); Grade D (severe rust, area >20%).

[0230] Table 1 Performance Test Results

[0231]

[0232] As shown in Table 1, the test results of Examples 1-5 using the technical solution of the present invention all exhibit excellent rust prevention performance. The salt spray test time is 48-72 hours, the damp heat test time is 650-960 hours, the corrosion current density is 0.32-0.82 μA / cm², the adhesion is grade 0 or 1, the stacking test is grade 1, and the cast iron chip test is grade A.

[0233] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An environmentally friendly water-based rust-preventive composition, characterized in that, It is prepared from the following raw materials in parts by weight: 3-8 parts of the triazine compound; 1-5 parts of the second triazine compound; 10-20 parts of 2-amino-2-methyl-1,3-propanediol; 2-5 parts of dipropylene glycol monomethyl ether; 65-85 parts water; The first triazine compound is a triazine compound having a substituent comprising a hydrophobic segment and at least two aminocarboxylic acid substituents; The second triazine compound is a triazine compound having a thiol substituent.

2. The environmentally friendly water-based rust-preventive composition according to claim 1, characterized in that, It is prepared from the following raw materials in parts by weight: 5-7 parts of the triazine compound; 2-3 parts of the second triazine compound; 12-18 parts of 2-amino-2-methyl-1,3-propanediol; 3-4 parts of dipropylene glycol monomethyl ether; 70-80 parts water.

3. The environmentally friendly water-based rust-preventive composition according to claim 1, characterized in that, The first triazine compound was prepared by the following method, with the raw materials in parts by weight: S1. Mix 1 part of cyanuric chloride with 8-12 parts of acetone, stir to dissolve, and form a reaction system. Control the reaction temperature at 0-5℃. Dissolve 0.6-0.8 parts of 6-hydroxyhexylamine in 1-2 parts of acetone and slowly add it dropwise to the reaction system; at the same time, add an alkaline solution to maintain the pH of the reaction system at 6-7. Continue stirring the reaction at 0-5℃ for 1-3 h to obtain intermediate I reaction solution; S2. Heat the reaction solution from step 1 to 25-30℃; add 0.8-1.0 parts by weight of 6-aminocaproic acid in batches, each time adding 0.1-0.2 parts by weight, with an interval of 5-10 minutes, while simultaneously adding alkaline solution to maintain pH 6-7. After the addition of materials is complete, stir the reaction at 25~30℃ for 3~4 h to obtain intermediate II reaction solution; S3. Heat the reaction solution from step 2 to 50-55℃; add 0.8-1.0 parts by weight of 6-aminohexanoic acid in batches, while simultaneously adding alkaline solution to maintain pH 7-8; stir the reaction at 50-55℃ for 4-5 hours. S4. Acetone was recovered by vacuum distillation. The remaining aqueous phase was cooled to room temperature, and hydrochloric acid was slowly added dropwise to adjust the pH to 3-4, causing solid to precipitate. The solid was filtered, the filter cake was washed 2-3 times with deionized water, and dried to obtain the first triazine compound.

4. The environmentally friendly water-based rust-preventive composition according to claim 3, characterized in that, In S1, the alkaline solution is slowly added dropwise to the reaction system over a period of 30-45 minutes; and / or, the alkaline solution is a sodium hydroxide solution with a mass concentration of 8%-12%.

5. The environmentally friendly water-based rust-preventive composition according to claim 1, characterized in that, The second triazine compound is 2,4,6-trimercapto-1,3,5-triazine.

6. The environmentally friendly water-based rust-preventive composition according to any one of claims 1-5, characterized in that, The total amount of the first triazine compound and the second triazine compound, in a weight ratio of 1:1.5-2.5 to 2-amino-2-methyl-1,3-propanediol.

7. The environmentally friendly water-based rust-preventive composition according to claim 6, characterized in that, The total amount of the first triazine compound and the second triazine compound, in a weight ratio of 1:1.7-1.8 to 2-amino-2-methyl-1,3-propanediol.

8. A method for preparing an environmentally friendly water-based rust-preventive composition as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Under stirring, the first and second triazine compounds are slowly added to 2-amino-2-methyl-1,3-propanediol, the temperature is raised, and the reaction is stirred to obtain mixture A; Step 2: Cool the mixture A obtained in Step 1 to below 40°C, add 30-40% of the formula amount of water, stir, and obtain mixture B; Step 3: Add dipropylene glycol monomethyl ether and the remaining amount of water to mixture B obtained in step 2, stir, and let stand to obtain an environmentally friendly water-based rust-preventive composition.

9. The preparation method according to claim 8, characterized in that, In step 1, the temperature is raised to 55℃-60℃, and the stirring reaction time is 1-2 hours.

10. The application of the environmentally friendly water-based rust-preventive composition according to any one of claims 1-7 or the environmentally friendly water-based rust-preventive composition prepared by the preparation method according to claim 8 or 9 in the rust prevention treatment of metal materials.

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