Composite anti-rust agent with mildew-proof and anti-rust performance and preparation method of composite anti-rust agent
The method for preparing a composite rust inhibitor using components such as 5-nitroisophthalate solves the problem of easy damage to the protective film of rust inhibitors in complex environments, achieving stable anti-mildew and anti-rust effects and uniform coating, suitable for long-term storage and transportation of industrial metals.
Patent Information
- Application Number
- CN202511814303.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-04
- Publication Date
- 2026-02-06
AI Technical Summary
Existing rust inhibitors are prone to damage to their protective films by fungal metabolites in complex environments with high humidity, high temperature and microbial growth, leading to accelerated metal corrosion. Furthermore, the compatibility between fungicide and rust inhibitor systems is poor, resulting in decreased film stability. Traditional preparation processes are cumbersome and difficult to control in terms of purification and dispersibility.
A composite rust inhibitor is composed of 5-nitrosophthalate, organic solvent, mildew inhibitor, corrosion inhibitor, antioxidant, and silane coupling agent. Through steps such as heating reaction, separation and purification, drying and pulverization, and high-pressure homogenization, a stable suspension is formed to ensure uniform dispersion of components and consistent film formation.
It provides stable dual protection against mold and rust in complex environments, extends service life, improves coating uniformity and stability, and is suitable for long-term storage and transportation of industrial metals.
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Figure CN121471745A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of metal surface protective materials, and in particular to a composite rust inhibitor with both anti-mildew and anti-rust properties and its preparation method. Background Technology
[0002] Metallic materials generally face multiple corrosion risks during storage and use, including fluctuations in environmental humidity, microbial growth, and the cumulative effects of oxidation reactions. Traditional rust inhibitors typically use organic acid salts, nitrites, or amines as the main protective components, forming a protective film by inhibiting oxidation reactions on the metal surface. However, industrial storage environments commonly experience mold spore attachment, microbial metabolic product erosion, and the accumulation of moisture-absorbing oil, making the metal surface susceptible to localized acidification under the influence of mold, further accelerating pitting corrosion. Existing single-function rust inhibitors are prone to having their protective films destroyed by mold metabolic products when faced with complex environmental conditions such as high humidity, high temperature, and microbial growth, leading to accelerated rusting within a short period. In addition, some traditional formulations suffer from problems such as rapid solvent evaporation, poor dispersion of active ingredients, and insufficient antioxidant capacity, making it difficult to meet the long-term stability requirements of industrial storage and transportation.
[0003] Existing technologies for improving the durability of metal surfaces attempt to enhance anti-mold capabilities through the addition of anti-mold agents or surface coatings. However, these methods generally face two core bottlenecks: First, the compatibility between anti-mold agents and rust-preventive systems is poor, leading to layering, crystallization, or uneven dispersion after mixing, resulting in decreased film stability. Second, the preparation processes of existing organometallic salt rust inhibitors are cumbersome, making it difficult to control purification, particle size distribution, and solvent dispersibility, affecting the final coating uniformity and thus reducing the overall protective effect. Therefore, there is an urgent need in industrial applications for a composite rust inhibitor with both anti-mold and rust-preventive properties and its preparation method to solve these problems. Summary of the Invention
[0004] To achieve the above objectives, the present invention provides a composite rust inhibitor with both anti-mildew and anti-rust properties and a preparation method thereof.
[0005] A composite rust inhibitor with both anti-mildew and anti-rust properties comprises 5-nitrobenzene isophthalate, an organic solvent, a mildew inhibitor, a corrosion inhibitor, a surfactant, an antioxidant, and a silane coupling agent, wherein the components are present in the following mass percentages: 5-Nitroisophthalate accounts for 10-30%; Organic solvents account for 43-79%; Antifungal agents account for 3-5%; Corrosion inhibitor content: 5-10%; Surfactants account for 1-5%; Antioxidants account for 1-2%; The proportion of silane coupling agent is 1-5%.
[0006] Optionally, the percentages of each component are as follows: 20% for 5-nitroisophthalate, 61.5% for organic solvent, 4% for mildew inhibitor, 7% for corrosion inhibitor, 3% for surfactant, 1.5% for antioxidant, and 3% for silane coupling agent.
[0007] Optionally, the organic solvent is selected from ethanol, ethylene glycol, or N,N-dimethylformamide; the fungicide is selected from 2-n-octyl-4-isothiazolin-3-one or benzimidazole; the corrosion inhibitor is selected from sodium molybdate, benzotriazole, or sodium phosphate; the surfactant is fatty alcohol polyoxyethylene ether; the antioxidant is 2,6-di-tert-butyl-p-cresol; the silane coupling agent is γ-aminopropyltriethoxysilane; and the 5-nitroisophthalate is zinc 5-nitroisophthalate.
[0008] A method for preparing a composite rust inhibitor with both anti-mildew and anti-rust properties includes the following steps: S1: 5-Nitroisophthalic acid is reacted with a metal oxide in the presence of an organic solvent and a catalyst by heating to generate a reaction mixture containing 5-nitroisophthalate. S2: The reaction mixture obtained in S1 is separated and purified to obtain purified 5-nitroisophthalate; S3: The 5-nitroisophthalate obtained in S2 is dried to obtain a dry powder; S4: The 5-nitrosophthalate powder obtained in S3 is premixed with a mildew inhibitor, a corrosion inhibitor, an antioxidant, and a silane coupling agent to obtain a uniform composite powder. S5: Mix the composite powder obtained in S4, surfactant and organic solvent, and homogenize to obtain the composite rust inhibitor product.
[0009] Optionally, S1 specifically includes: S11: Place 5-nitroisophthalic acid and metal oxide in a reactor at a molar ratio of 1:1 to 1:3, and then add an organic solvent that is 3 to 5 times the weight of 5-nitroisophthalic acid. S12: Add a catalyst of 0.5%-2% by weight of 5-nitroisophthalic acid to the mixture of S11, and stir continuously at 200-500 rpm for 2-6 hours at a temperature of 70℃-90℃. S13: After the reaction is complete, the reaction system is naturally cooled to 25℃-40℃ to obtain a reaction mixture containing 5-nitroisophthalate.
[0010] Optionally, the metal oxide is zinc oxide; the catalyst is tetrabutylammonium bromide, tetrabutylammonium chloride, or triethylamine.
[0011] Optionally, S2 specifically includes: S21: Transfer the reaction mixture obtained in S1 to a container, add 2-4 times its volume of deionized water while stirring, and let it stand at 25℃-40℃ for 0.5-2 hours to allow 5-nitrobenzene to precipitate fully. S22: Filter the mixture that has been precipitated in S21 through a vacuum filtration device and collect the solid filter cake; S23: The filter cake obtained in S22 is rinsed 2-4 times with a washing solvent, wherein the amount of washing solvent used in each rinse is 1-3 times the mass of the filter cake. S24: After washing, wet purified 5-nitroisophthalate is obtained.
[0012] Optionally, S3 specifically includes: S31: The wet purified 5-nitroisophthalate obtained in S24 is mechanically crushed to make it into granular material with a particle size of 1-5mm; S32: Spread the granular material obtained in S31 in a vacuum drying oven with a layer thickness of 10-30 mm, and dry it for 2-4 hours at a temperature of 65-75℃ and a vacuum degree of -0.08 to -0.1 MPa. S33: After drying, the material is cooled to 25-35℃, pulverized, and passed through a 100-200 mesh sieve to obtain dried 5-nitroisophthalate powder.
[0013] Optionally, S4 specifically includes: S41: Place the 5-nitroisophthalate powder obtained in S3 into a high-speed shear mixer and run it at 800-1200 rpm for 2-5 minutes; S42: Keep the equipment running and add the mold inhibitor, corrosion inhibitor and antioxidant in sequence according to the formula. The interval between adding each component is 1-3 minutes. S43: After all components have been added, increase the mixer speed to 2000-3000 rpm and continue mixing for 10-20 minutes; S44: Pass the mixed materials through a 150-200 mesh vibrating screen to collect the composite powder passing through the screen.
[0014] Optionally, S5 specifically includes: S51: Add 70% of the organic solvent used in the formulation to the mixing tank. Under stirring conditions of 300-500 rpm, slowly add the surfactant used in the formulation, controlling the addition time to 3-5 minutes, to form a uniform and transparent solvent system. S52: Keep stirring and add the composite powder obtained in S4 to the solvent system in S51 in 3-5 batches, with an interval of 2-4 minutes between each batch. After all the powder has been added, continue stirring for 15-30 minutes to form a preliminarily dispersed slurry. S53: Add the remaining 30% organic solvent to the slurry, adjust the stirring speed to 100-200 rpm, and mature at 40-50℃ for 1-2 hours; S54: Transfer the matured slurry into a high-pressure homogenizer and circulate it 2-4 times under a pressure of 15-25MPa to obtain a uniform and stable suspension. S55: Filter the homogenized suspension through a 200-300 mesh filter bag and collect the filtrate to obtain the composite rust inhibitor product.
[0015] The beneficial effects of this invention are: This invention introduces zinc 5-nitroisophthalate as the main rust-preventing component, combined with a mildew inhibitor, corrosion inhibitor, antioxidant, surfactant, and silane coupling agent to form a complex system, which can achieve simultaneous mildew and rust prevention protection for metals in complex storage environments. Among them, zinc 5-nitroisophthalate is prepared by in-situ generation of metal oxides, avoiding the problems of poor solubility and many reaction by-products of traditional organic acid salts. Combined with a high-pressure homogenization dispersion process, the components are fully dispersed to form a stable suspension, which significantly improves the stability of the rust inhibitor and the uniformity of coating.
[0016] This invention employs progressive drying and pulverization, fine ingredient formulation, and shear homogenization to ensure the dispersion efficiency and film formation consistency of the composite components in organic solvents, avoiding issues such as component leaching or decreased compatibility. Compared to traditional single rust-proof or mildew-proof products, it can continuously provide stable dual protection in high humidity, high temperature, and environments where microorganisms easily multiply, with a longer service life and higher protection efficiency. It is suitable for industrial application scenarios with high requirements for long-term storage and transportation of metals and corrosion control in complex environments. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the preparation method of the composite rust inhibitor according to an embodiment of the present invention. Detailed Implementation
[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.
[0020] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.
[0021] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.
[0022] Example 1 A composite rust inhibitor with both anti-mildew and anti-rust properties, comprising the following percentages: 20% 5-nitroisophthalate, 61.5% organic solvent, 4% mildew inhibitor, 7% corrosion inhibitor, 3% surfactant, 1.5% antioxidant, and 3% silane coupling agent.
[0023] The organic solvent is selected from ethanol; the fungicide is selected from 2-n-octyl-4-isothiazolin-3-one; the corrosion inhibitor is selected from sodium molybdate; the surfactant is fatty alcohol polyoxyethylene ether; the antioxidant is 2,6-di-tert-butyl-p-cresol; the silane coupling agent is γ-aminopropyltriethoxysilane; and the 5-nitroisophthalate is zinc 5-nitroisophthalate.
[0024] like Figure 1 As shown, a method for preparing a composite rust inhibitor with both anti-mildew and anti-rust properties includes the following steps: S1: 5-Nitroisophthalic acid is reacted with a metal oxide in the presence of an organic solvent and a catalyst by heating to generate a reaction mixture containing 5-nitroisophthalate. S2: The reaction mixture obtained in S1 is separated and purified to obtain purified 5-nitroisophthalate; S3: The 5-nitroisophthalate obtained in S2 is dried to obtain a dry powder; S4: The 5-nitrosophthalate powder obtained in S3 is premixed with a mildew inhibitor, a corrosion inhibitor, an antioxidant, and a silane coupling agent to obtain a uniform composite powder. S5: Mix the composite powder obtained in S4, surfactant and organic solvent, and homogenize to obtain the composite rust inhibitor product.
[0025] S1 specifically includes: S11: Place 5-nitroisophthalic acid and metal oxide in a reactor at a molar ratio of 1:2, and then add an organic solvent that is 4 times the weight of 5-nitroisophthalic acid. S12: Add a catalyst accounting for 0.8% of the weight of 5-nitroisophthalic acid to the mixture of S11, and stir continuously at 300 rpm for 4 hours at 80°C. S13: After the reaction is complete, the reaction system is naturally cooled to 30°C to obtain a reaction mixture containing 5-nitroisophthalate.
[0026] The metal oxide is zinc oxide; the catalyst is tetrabutylammonium bromide.
[0027] S2 specifically includes: S21: Transfer the reaction mixture obtained in S1 to a container, add three times its volume of deionized water while stirring, and let it stand at 30°C for 1 hour to allow 5-nitrobophthalate to precipitate fully. S22: Filter the mixture that has been precipitated in S21 through a vacuum filtration device and collect the solid filter cake; S23: The filter cake obtained in S22 is rinsed three times with a washing solvent, and the amount of washing solvent used in each rinse is twice the mass of the filter cake. S24: After washing, wet purified 5-nitroisophthalate is obtained.
[0028] S3 specifically includes: S31: The wet purified 5-nitroisophthalate obtained in S24 is mechanically crushed to make it into granular material with a particle size of 3mm; S32: Spread the granular material obtained in S31 in a vacuum drying oven with a layer thickness of 20 mm, and dry it for 3 hours at a temperature of 70℃ and a vacuum of -0.09 MPa. S33: After drying, the material is cooled to 30°C, pulverized, and passed through a 150-mesh sieve to obtain dried 5-nitroisophthalate powder.
[0029] S4 specifically includes: S41: Place the 5-nitroisophthalate powder obtained in S3 into a high-speed shear mixer and run it at 1000 rpm for 3 minutes; S42: Keep the equipment running and add the mold inhibitor, corrosion inhibitor and antioxidant in sequence according to the formula. The interval between adding each component is 2 minutes. S43: After all components have been added, increase the mixer speed to 2500 rpm and continue mixing for 15 minutes; S44: Pass the mixed materials through a 180-mesh vibrating screen to collect the composite powder passing through the screen.
[0030] S5 specifically includes: S51: Add 70% of the organic solvent used in the formulation to the mixing tank. Under stirring conditions of 400 rpm, slowly add the surfactant used in the formulation, controlling the addition time to 4 minutes, to form a uniform and transparent solvent system. S52: While stirring, add the composite powder obtained in S4 to the solvent system in S51 in 4 batches, with an interval of 3 minutes between each batch. After all the powder has been added, continue stirring for 20 minutes to form a preliminarily dispersed slurry. S53: Add the remaining 30% organic solvent to the slurry, adjust the stirring speed to 150 rpm, and mature at 45°C for 1.5 hours; S54: The matured slurry is transferred into a high-pressure homogenizer and circulated three times under a pressure of 20MPa to obtain a uniform and stable suspension. S55: Filter the homogenized suspension through a 250-mesh filter bag and collect the filtrate to obtain the finished composite rust inhibitor.
[0031] Example 2 Formula composition: 10% 5-nitroisophthalate, 79% organic solvent (ethylene glycol), 3% mildew inhibitor (benzimidazole), 5% corrosion inhibitor (benzotriazole), 1% surfactant (fatty alcohol polyoxyethylene ether), 1% antioxidant (2,6-di-tert-butyl-p-cresol), and 1% silane coupling agent (γ-aminopropyltriethoxysilane).
[0032] The preparation steps are as follows: S1: Weigh 5-nitroisophthalic acid and zinc oxide and add them to the reactor in a 1:1 molar ratio. Add ethanol, which is 3 times the mass of 5-nitroisophthalic acid, as an organic solvent. Then add tetrabutylammonium chloride as a catalyst, which is 0.5% of the mass of 5-nitroisophthalic acid. The reaction is carried out at 70°C and 200 rpm for 2 hours. After the reaction is completed, the mixture is naturally cooled to 25°C to obtain a reaction mixture containing 5-nitroisophthalate. S2: Transfer the above reaction mixture to a clean container, slowly add twice its volume of deionized water while stirring continuously, and let it stand at 25°C for 0.5 hours to allow the product to fully precipitate; then use a vacuum filtration device to separate the solid and liquid, collect the precipitate and wash it with an ethanol / water mixture (volume ratio 2:1) twice, with each washing solution being 1 times the mass of the filter cake; finally, wet purified 5-nitrobenzene isophthalate is obtained; S3: The above wet filter cake is mechanically crushed into granular material with a particle size of 1mm, and spread evenly in a vacuum drying oven, controlling the layer thickness to be 10mm, and dried for 2 hours at a temperature of 65℃ and a vacuum degree of -0.08MPa; after drying, the material is cooled to 25℃, and then pulverized using a pulverizer, and obtained 5-nitrobenzene powder with uniform particle size by sieving through a 100-mesh sieve; S4: Place the dried powder in a high-speed shear mixer and premix for 2 minutes at 800 rpm. Then, while the equipment is running, add the mold inhibitor, corrosion inhibitor, and antioxidant in sequence according to the formula, with an interval of 1 minute between each component. After all components are added, increase the mixer speed to 2000 rpm and continue mixing for 10 minutes to ensure uniform mixing. Finally, sieve the mixture through a 150-mesh vibrating screen and collect the undersized composite powder. S5: First, add 70% ethanol to the mixing tank, and slowly add all the surfactants while stirring at 300 rpm for 3 minutes to form a homogeneous and transparent solution. Then, add the composite powder to the solution system in 3 batches, with an interval of 2 minutes between each batch. After all the powders are added, continue stirring for 15 minutes to obtain a preliminary slurry. Then, add the remaining 30% ethanol, adjust the stirring speed to 100 rpm, and mature at 40°C for 1 hour. After maturation, send the slurry to a high-pressure homogenizer and perform two cycles of homogenization under a pressure of 15 MPa to obtain a uniform and stable suspension. Finally, filter it through a 200-mesh filter bag and collect the filtrate to obtain the finished composite rust inhibitor.
[0033] Example 3 Formulation composition: 30% 5-nitroisophthalate, 43% organic solvent (N,N-dimethylformamide), 5% mildew inhibitor (2-n-octyl-4-isothiazolin-3-one), 10% corrosion inhibitor (sodium phosphate), 5% surfactant (fatty alcohol polyoxyethylene ether), 2% antioxidant (2,6-di-tert-butyl-p-cresol), and 5% silane coupling agent (γ-aminopropyltriethoxysilane).
[0034] The preparation steps are as follows: S1: Weigh 5-nitroisophthalic acid and zinc oxide and add them to the reactor in a molar ratio of 1:3. Add ethanol, which is 5 times the mass of 5-nitroisophthalic acid, as an organic solvent. Then add triethylamine as a catalyst, which is 2% of the mass of 5-nitroisophthalic acid. The reaction is carried out at 90°C and 500 rpm for 6 hours. After the reaction is completed, the mixture is naturally cooled to 40°C to obtain a reaction mixture containing 5-nitroisophthalate. S2: Transfer the above reaction mixture to a clean container, slowly add 4 times its volume of deionized water while stirring continuously, and let it stand at 40°C for 2 hours to allow the product to fully precipitate; then use a vacuum filtration device to separate the solid and liquid, collect the precipitate and wash it with an ethanol / water mixed solution (volume ratio 2:1) 4 times, with each washing solution being 3 times the mass of the filter cake; finally, wet purified 5-nitrobenzene is obtained; S3: The above wet filter cake is mechanically crushed into granular material with a particle size of 5mm, and spread evenly in a vacuum drying oven with a layer thickness of 30mm. It is dried for 4 hours at a temperature of 75℃ and a vacuum degree of -0.1MPa. After drying, the material is cooled to 35℃ and then pulverized using a pulverizer. The pulverized material is then passed through a 200-mesh sieve to obtain 5-nitrobenzene phthalate powder with uniform particle size. S4: Place the dried powder in a high-speed shear mixer and premix for 5 minutes at 1200 rpm. Then, while the equipment is running, add the mold inhibitor, corrosion inhibitor, and antioxidant in the formula in sequence, with an interval of 3 minutes between each component. After all components have been added, increase the mixer speed to 3000 rpm and continue mixing for 20 minutes to ensure uniform mixing. Finally, sieve the mixture through a 200-mesh vibrating screen and collect the undersized composite powder. S5: First, add 70% ethanol to the mixing tank, and slowly add all the surfactants while stirring at 500 rpm for 5 minutes to form a homogeneous and transparent solution. Then, add the composite powder to the solution system in 5 batches, with an interval of 4 minutes between each batch. After all the powders are added, continue stirring for 30 minutes to obtain a preliminary slurry. Then, add the remaining 30% ethanol, adjust the stirring speed to 200 rpm, and mature at 50°C for 2 hours. After maturation, send the slurry to a high-pressure homogenizer and perform 4 cycles of homogenization under a pressure of 25 MPa to obtain a uniform and stable suspension. Finally, filter it through a 300-mesh filter bag and collect the filtrate to obtain the finished composite rust inhibitor.
[0035] Table 1 Comparison of Performance Parameters of Composite Rust Inhibitors
[0036] As can be seen from the comparison in Table 1 above, Example 1 performs best in key indicators such as rust prevention efficiency, mildew prevention effect, coating uniformity, thermal stability, and storage stability. Its rust prevention efficiency reaches 98.6%, its mildew prevention level is 0 (i.e., no fungal growth), its viscosity is controlled within a moderate range, it has good application compatibility and dispersion uniformity, its suspension stability reaches the A-level standard, and there is no obvious stratification or failure after 90 days of storage. Its adhesion strength is also superior to the other two formulations. Regarding anti-settling properties, Example 1 showed no stratification after 30 days of standing, indicating its high suspension stability and resistance to failure during transportation and storage. In contrast, although Example 2 has a higher proportion of organic solvents and a thinner formulation, it is prone to sedimentation and dries slowly, resulting in weaker overall performance. While Example 3 is close to Example 1 in terms of mildew and rust prevention effects, its system viscosity is slightly higher, its application fluidity is poorer, and its homogeneity is slightly inferior. Therefore, considering protective performance, storage and transportation adaptability, and application performance, Example 1 is the optimal implementation method and is suitable for widespread application.
[0037] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.
[0038] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A composite rust inhibitor with both anti-mildew and anti-rust properties, characterized in that, Includes 5-nitrobenzene isophthalate, organic solvent, fungicide, corrosion inhibitor, surfactant, antioxidant, and silane coupling agent; each component is expressed as a percentage by mass. 5-Nitroisophthalate accounts for 10-30%; Organic solvents account for 43-79%; Antifungal agents account for 3-5%; Corrosion inhibitor content: 5-10%; Surfactants account for 1-5%; Antioxidants account for 1-2%; The proportion of silane coupling agent is 1-5%.
2. The composite rust inhibitor with both anti-mildew and anti-rust properties according to claim 1, characterized in that, The percentages of each component are as follows: 5-nitroisophthalate 20%, organic solvent 61.5%, mildew inhibitor 4%, corrosion inhibitor 7%, surfactant 3%, antioxidant 1.5%, and silane coupling agent 3%.
3. The composite rust inhibitor with both anti-mildew and anti-rust properties according to claim 1, characterized in that, The organic solvent is selected from ethanol, ethylene glycol, or N,N-dimethylformamide; the fungicide is selected from 2-n-octyl-4-isothiazolin-3-one or benzimidazole; the corrosion inhibitor is selected from sodium molybdate, benzotriazole, or sodium phosphate; the surfactant is fatty alcohol polyoxyethylene ether; the antioxidant is 2,6-di-tert-butyl-p-cresol; the silane coupling agent is γ-aminopropyltriethoxysilane; and the 5-nitroisophthalate is zinc 5-nitroisophthalate.
4. A method for preparing a composite rust inhibitor with both anti-mildew and anti-rust properties, used to prepare the composite rust inhibitor with both anti-mildew and anti-rust properties as described in any one of claims 1-3, characterized in that, Includes the following steps: S1: 5-Nitroisophthalic acid is reacted with a metal oxide in the presence of an organic solvent and a catalyst by heating to generate a reaction mixture containing 5-nitroisophthalate. S2: The reaction mixture obtained in S1 is separated and purified to obtain purified 5-nitroisophthalate; S3: The 5-nitroisophthalate obtained in S2 is dried to obtain a dry powder; S4: The 5-nitrosophthalate powder obtained in S3 is premixed with a mildew inhibitor, a corrosion inhibitor, an antioxidant, and a silane coupling agent to obtain a uniform composite powder. S5: Mix the composite powder obtained in S4, surfactant and organic solvent, and homogenize to obtain the composite rust inhibitor product.
5. The method for preparing a composite rust inhibitor with both anti-mildew and anti-rust properties according to claim 4, characterized in that, S1 specifically includes: S11: Place 5-nitroisophthalic acid and metal oxide in a reactor at a molar ratio of 1:1 to 1:3, and then add an organic solvent that is 3 to 5 times the weight of 5-nitroisophthalic acid. S12: Add a catalyst of 0.5%-2% by weight of 5-nitroisophthalic acid to the mixture of S11, and stir continuously at 200-500 rpm for 2-6 hours at a temperature of 70℃-90℃. S13: After the reaction is complete, the reaction system is naturally cooled to 25℃-40℃ to obtain a reaction mixture containing 5-nitroisophthalate.
6. The method for preparing a composite rust inhibitor with both anti-mildew and anti-rust properties according to claim 5, characterized in that, The metal oxide is zinc oxide; the catalyst is tetrabutylammonium bromide, tetrabutylammonium chloride, or triethylamine.
7. The method for preparing a composite rust inhibitor with both anti-mildew and anti-rust properties according to claim 4, characterized in that, S2 specifically includes: S21: Transfer the reaction mixture obtained in S1 to a container, add 2-4 times its volume of deionized water while stirring, and let it stand at 25℃-40℃ for 0.5-2 hours to allow 5-nitrobenzene to precipitate fully. S22: Filter the mixture that has been precipitated in S21 through a vacuum filtration device and collect the solid filter cake; S23: The filter cake obtained in S22 is rinsed 2-4 times with a washing solvent, wherein the amount of washing solvent used in each rinse is 1-3 times the mass of the filter cake. S24: After washing, wet purified 5-nitroisophthalate is obtained.
8. The method for preparing a composite rust inhibitor with both anti-mildew and anti-rust properties according to claim 4, characterized in that, S3 specifically includes: S31: The wet purified 5-nitroisophthalate obtained in S24 is mechanically crushed to make it into granular material with a particle size of 1-5mm; S32: Spread the granular material obtained in S31 in a vacuum drying oven with a layer thickness of 10-30 mm, and dry it for 2-4 hours at a temperature of 65-75℃ and a vacuum degree of -0.08 to -0.1 MPa. S33: After drying, the material is cooled to 25-35℃, pulverized, and passed through a 100-200 mesh sieve to obtain dried 5-nitroisophthalate powder.
9. The method for preparing a composite rust inhibitor with both anti-mildew and anti-rust properties according to claim 4, characterized in that, S4 specifically includes: S41: Place the 5-nitroisophthalate powder obtained in S3 into a high-speed shear mixer and run it at 800-1200 rpm for 2-5 minutes; S42: Keep the equipment running and add the mold inhibitor, corrosion inhibitor and antioxidant in sequence according to the formula. The interval between adding each component is 1-3 minutes. S43: After all components have been added, increase the mixer speed to 2000-3000 rpm and continue mixing for 10-20 minutes; S44: Pass the mixed materials through a 150-200 mesh vibrating screen to collect the composite powder passing through the screen.
10. The method for preparing a composite rust inhibitor with both anti-mildew and anti-rust properties according to claim 4, characterized in that, S5 specifically includes: S51: Add 70% of the organic solvent used in the formulation to the mixing tank. Under stirring conditions of 300-500 rpm, slowly add the surfactant used in the formulation, controlling the addition time to 3-5 minutes, to form a uniform and transparent solvent system. S52: Keep stirring and add the composite powder obtained in S4 to the solvent system in S51 in 3-5 batches, with an interval of 2-4 minutes between each batch. After all the powder has been added, continue stirring for 15-30 minutes to form a preliminarily dispersed slurry. S53: Add the remaining 30% organic solvent to the slurry, adjust the stirring speed to 100-200 rpm, and mature at 40-50℃ for 1-2 hours; S54: Transfer the matured slurry into a high-pressure homogenizer and circulate it 2-4 times under a pressure of 15-25MPa to obtain a uniform and stable suspension. S55: Filter the homogenized suspension through a 200-300 mesh filter bag and collect the filtrate to obtain the composite rust inhibitor product.