A resin rust preventive, its preparation method and application

Abstract

The application discloses a resin rust inhibitor and a preparation method and application thereof, and relates to the technical field of rust prevention. The resin rust inhibitor provided by the application comprises 0.5-2 parts of tetraglycidyl-4,4'-diamino diphenyl methane, 1-5 parts of diisopropanolamine, 0.02-0.15 parts of a silane coupling agent and 0.01-0.1 parts of nano-SiO2. The tetraglycidyl-4,4'-diamino diphenyl methane has high adhesion, and can improve the adhesion of the water-based rust inhibitor to metal. The introduction of the diisopropanolamine and the nano-SiO2 improves the high-temperature and low-temperature resistance of the resin, and makes the resin have better water solubility and be fully compatible with the water-based system. The water-based rust inhibitor obtained by taking the resin rust inhibitor as the main component has excellent adhesion and high-temperature and low-temperature resistance, and still has good adhesion at a low temperature of-20±2 DEG C, and does not excessively lose at a high temperature of 89±1 DEG C.

Description

Technical Field

[0001] This invention relates to the field of rust prevention technology, specifically to a resin rust inhibitor, its preparation method, and its application. Background Technology

[0002] Metals are widely used in all aspects of industrial production and human life, playing a crucial role in technological development and economic construction. However, metal products are prone to corrosion during processing, production, transportation, and storage, which can even lead to performance degradation in severe cases. Therefore, it is necessary to coat metal surfaces with a rust inhibitor to protect them. However, with increasingly stringent environmental regulations, traditional oil-based rust inhibitors have been gradually replaced by water-based rust inhibitors due to their potential hazards to the environment and human health. Water-based rust inhibitors have a wider range of applications and can prevent metal corrosion through mechanisms such as passivation, adsorption, and complexation. However, their rust-preventive performance is limited, and their stability, applicability, and maintenance costs require continuous innovation and optimization.

[0003] Currently, water-based rust inhibitors primarily achieve their rust-preventing effect by adding organic or inorganic rust inhibitors. Water-soluble organic rust inhibitors mainly work by adsorbing organic molecules onto the metal surface through physical and chemical adsorption, altering the metal surface state and thus preventing rust. Some are formulated by adding water-soluble organic film-forming agents, corrosion inhibitors, and solubilizers, forming a very thin organic film on the metal surface to block corrosive media from contacting the metal. The corrosion inhibitors added to this film also inhibit corrosion. Inorganic rust inhibitors, on the other hand, can form an insoluble passivation film or reactive film on the metal surface, thus preventing rust. Adding anionic or nonionic surfactants to water-based rust inhibitors can further increase the wettability and penetration of the rust inhibitor, promoting uniform coverage of the metal surface.

[0004] Based on the principle of "like dissolves like," water-based rust inhibitors are easily washed away by water, leading to a decrease in their rust-preventing performance. Furthermore, water-based rust inhibitors may freeze at low temperatures, affecting their rust-preventing effect and service life. At high temperatures, water evaporation increases the concentration of the rust inhibitor, further reducing its effectiveness. Some water-based rust inhibitors may also be corrosive to certain metal materials (such as aluminum and magnesium alloys). To address these issues, it is necessary to develop water-based rust inhibitors with good adhesion and stability, making them less prone to being washed away, while also possessing resistance to both high and low temperatures. Summary of the Invention

[0005] To address the problem that existing technologies cannot provide a water-based rust inhibitor that combines high adhesion with high temperature and low temperature resistance, this invention provides a resin rust inhibitor. This rust inhibitor is tetraglycidyl-4,4'-diaminodiphenylmethane modified with a specific ratio of diisopropanolamine and nano-SiO2. It has excellent low temperature and high temperature resistance and is suitable for water-based systems. The resulting water-based rust inhibitor also has excellent adhesion.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned resin rust inhibitor.

[0007] Another object of the present invention is to provide a water-based rust inhibitor comprising the above-mentioned resin rust inhibitor.

[0008] Another object of the present invention is to provide a method for preparing the above-mentioned water-based rust inhibitor.

[0009] The above-mentioned objective of this invention is achieved through the following technical solution:

[0010] A resin rust inhibitor, characterized in that it comprises the following raw materials in parts by weight: 0.5 to 2 parts tetraglycidyl-4,4'-diaminodiphenylmethane, 1 to 5 parts diisopropanolamine, 0.02 to 0.15 parts silane coupling agent, and 0.012 to 0.1 parts nano-SiO2.

[0011] The resin rust inhibitor provided by this invention uses tetraglycidyl-4,4'-diaminodiphenylmethane, i.e., MF-4101H epoxy resin, which has four epoxy groups that can undergo a ring-opening addition reaction with diisopropanolamine, exhibiting excellent reactivity. After the reaction, diisopropanolamine can introduce strongly hydrophilic hydroxyl groups into the tetraglycidyl-4,4'-diaminodiphenylmethane molecular chain, improving the compatibility of the resin with the water-based system. Simultaneously, the resin's high adhesiveness can improve the adhesion of the water-based rust inhibitor to the metal. Based on the modification of tetraglycidyl-4,4'-diaminodiphenylmethane with diisopropanolamine, further surface modification of the resin with nano-SiO2 can limit heat conduction through gas pores, improving the resin's high and low temperature resistance. However, the compatibility between nano-SiO2 and the modified tetraglycidyl-4,4'-diaminodiphenylmethane, and between nano-SiO2 and the water-based system, needs further improvement. Therefore, a certain amount of silane coupling agent needs to be introduced into the system.

[0012] Controlling the proportions of each component in the resin rust inhibitor is not only to improve the compatibility of the modified resin with the water-based system, but also to retain a certain amount of epoxy groups to participate in the resin curing process. This allows the resin rust inhibitor to form a dense film on the metal surface during the actual application of the rust inhibitor, thus achieving a good rust-preventing effect.

[0013] Preferably, the particle size of the nano-SiO2 is 20±5nm.

[0014] Preferably, the mass ratio of the nano-SiO2 to tetraglycidyl-4,4'-diaminodiphenylmethane is (2-3):100.

[0015] Preferably, the silane coupling agent is an amino-based silane coupling agent.

[0016] More preferably, the silane coupling agent is γ-aminopropyltriethoxysilane.

[0017] More preferably, the mass ratio of the silane coupling agent to tetraglycidyl-4,4'-diaminodiphenylmethane is (5-7):100.

[0018] Preferably, the mass ratio of diisopropanolamine to tetraglycidyl-4,4'-diaminodiphenylmethane is (2-4):1.

[0019] By controlling the proportions of each component in the resin rust inhibitor within the above-mentioned range, a water-based rust inhibitor with higher adhesion, stability, film density, and high and low temperature resistance can be obtained, while also achieving a higher yield. Improved film density enhances the rust-preventive performance of the rust inhibitor.

[0020] This invention also protects a method for preparing the above-mentioned resin rust inhibitor, comprising the following steps:

[0021] S1. Diisopropanolamine and tetraglycidyl-4,4'-diaminodiphenylmethane are mixed and reacted at T℃ to obtain modified tetraglycidyl-4,4'-diaminodiphenylmethane; wherein T≥60℃;

[0022] S2. After mixing the modified tetraglycidyl-4,4'-diaminodiphenylmethane, silane coupling agent and nano-SiO2 obtained in step S1 in a solution environment, the resin rust inhibitor can be obtained.

[0023] In a specific embodiment of the present invention, in step S1, tetraglycidyl-4,4'-diaminodiphenylmethane resin is first dissolved in a solvent at 60-70°C, and then diisopropanolamine is added for modification.

[0024] More specifically, in step S1, tetraglycidyl-4,4'-diaminodiphenylmethane is first dissolved in a solvent at 65°C.

[0025] More specifically, the solvent in step S1 is ethanol.

[0026] Preferably, in step S1, tetraglycidyl-4,4'-diaminodiphenylmethane is modified with diisopropanolamine at a temperature of 70–90°C.

[0027] More specifically, in step S1, tetraglycidyl-4,4'-diaminodiphenylmethane is modified with diisopropanolamine at a temperature of 80°C.

[0028] Preferably, the modification time of tetraglycidyl-4,4'-diaminodiphenylmethane with diisopropanolamine in step S1 is 1 to 5 hours.

[0029] In a specific embodiment of the present invention, when modifying tetraglycidyl-4,4'-diaminodiphenylmethane with diisopropanolamine in step S1, the diisopropanolamine and tetraglycidyl-4,4'-diaminodiphenylmethane are first mixed and reacted for 2 hours, and then the pH of the reaction system is adjusted to neutral and the reaction continues for 30 minutes.

[0030] Preferably, glacial acetic acid is used as the reagent to adjust the pH of the reaction system. After introducing hydroxyl groups onto the tetraglycidyl-4,4'-diaminodiphenylmethane molecular chain using diisopropanolamine, glacial acetic acid is added. Acetic acid can form a salt with the tertiary amine group of the resin, which can then ionize in water to release strongly hydrophilic tertiary amine cations and acetate ions, forming an aqueous system.

[0031] In a specific embodiment of the present invention, after the reaction of diisopropanolamine with tetraglycidyl-4,4'-diaminodiphenylmethane is completed in step S1, the resulting modified tetraglycidyl-4,4'-diaminodiphenylmethane can be dried.

[0032] In a specific embodiment of the present invention, the reaction temperature in step S2 is 60-70°C.

[0033] More specifically, the reaction temperature in step S2 is 65°C.

[0034] In a specific embodiment of the present invention, the reaction in step S2 is carried out under acidic conditions.

[0035] More specifically, the reaction in step S2 is carried out at a pH of 2.

[0036] In a specific embodiment of the present invention, hydrochloric acid is used to adjust the pH to 2 in step S2.

[0037] In a specific embodiment of the present invention, the solution environment in step S2 is provided by ethanol and water.

[0038] More specifically, the solution environment in step S2 is provided by ethanol and water in a volume ratio of 9:1.

[0039] In a specific embodiment of the present invention, the reaction in step S2 is carried out under reflux stirring conditions.

[0040] In a specific embodiment of the present invention, in step S2, the silane coupling agent and nano-SiO2 are first mixed, and then the modified tetraglycidyl-4,4'-diaminodiphenylmethane obtained in step S1 is added to react.

[0041] More specifically, in step S2, the silane coupling agent and nano-SiO2 are first ultrasonically dispersed for 30 min and mixed evenly, and then the modified tetraglycidyl-4,4'-diaminodiphenylmethane obtained in step S1 is added to carry out the reaction.

[0042] More specifically, in step S2, the modified tetraglycidyl-4,4'-diaminodiphenylmethane obtained in step S1 is added and reacted for 30 minutes.

[0043] The present invention also protects a water-based rust inhibitor, wherein the components of the water-based rust inhibitor include the above-mentioned resin rust inhibitor.

[0044] Preferably, the water-based rust inhibitor further includes at least one of the following: a solution, an antioxidant, a corrosion inhibitor, a polymerization inhibitor, an adhesion improver, a surfactant, a defoamer, and a processing aid; the solution includes water.

[0045] More preferably, the water-based rust inhibitor comprises the following components in parts by mass:

[0046] 20-45 parts resin rust inhibitor, 5-12 parts antioxidant, 0.2-1 part corrosion inhibitor, 0.5-1.5 parts polymerization inhibitor, 5-15 parts adhesion improver, 2-4 parts surfactant, 0.1-1 part defoamer, 2-5 parts processing aid, and 300 parts water.

[0047] In a specific embodiment of the present invention, the antioxidant is at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and 2,4-di-tert-butyl-6-n-octylthiomethylphenol.

[0048] In a specific embodiment of the present invention, the corrosion inhibitor is at least one of benzotriazole and L-proline.

[0049] Preferably, the corrosion inhibitor is benzotriazole and L-proline.

[0050] The corrosion inhibitor formulated with the addition of L-proline can improve the corrosion inhibition effect of benzotriazole.

[0051] In a specific embodiment of the present invention, the polymerization inhibitor is at least one of tert-butylhydroquinone, phenothiazine, and β-naphthol.

[0052] Preferably, the polymerization inhibitor is tert-butylhydroquinone, phenothiazine, and β-naphthol.

[0053] Tert-butylhydroquinone, phenothiazine, and β-naphthol can work synergistically to inhibit free radical reactions in water-soluble resins and improve the antioxidant properties of water-based rust inhibitors.

[0054] In a specific embodiment of the present invention, the adhesion improver is at least one of ethylene glycol di(meth)acrylate and N,N-methylenebisacrylamide.

[0055] In a specific embodiment of the present invention, the surfactant is at least one of nonylphenol polyoxyethylene ether, polydimethylsiloxane, isotridecyl alcohol polyoxyethylene ether, and fatty secondary alcohol polyoxyethylene ether.

[0056] In a specific embodiment of the present invention, the defoamer is at least one of dimethyl silicone oil and polyacrylate.

[0057] In a specific embodiment of the present invention, the processing aid is prepared by reacting the following components in parts by mass:

[0058] 1-2 parts of isomeric tridecyl alcohol polyoxyethylene ether, 1-2 parts of fatty secondary alcohol polyoxyethylene ether, 0.1-0.2 parts of nano titanium dioxide, 1-2 parts of sodium citrate pentahydrate, 1-2 parts of benzotriazole, 1-2 parts of tert-butylhydroquinone, 1-2 parts of phenothiazine, 2-3 parts of borax, 3-4 parts of urea, 1-2 parts of ammonium persulfate, and 20-24 parts of water.

[0059] In a specific embodiment of the present invention, the method for preparing the processing aid includes the following steps:

[0060] Dissolve each component in water, mix well, and react at 70-80℃ for 1-2 hours to obtain the additive.

[0061] More specifically, the preparation method of the processing aid includes the following steps:

[0062] After mixing ammonium persulfate with water, add the remaining material, stir for 10-15 minutes, heat to 70-80℃, and stir to react for 1-2 hours to obtain the final product.

[0063] The processing aids in this invention are mixtures of defoamers, antioxidants, and solubilizers. Adding trace amounts of these processing aids to a water-based rust inhibitor can improve its processability and stability.

[0064] Preferably, the mass ratio of resin rust inhibitor to water in the water-based rust inhibitor is (30-35):300.

[0065] This invention also protects a method for preparing a water-based rust inhibitor, comprising the following steps:

[0066] (1) Mix surfactant, defoamer and water at 40-50℃ to obtain solution A;

[0067] (2) Place the remaining components into solution A at 85-90℃ and mix well to obtain water-based rust inhibitor.

[0068] In a specific embodiment of the present invention, in step (2), the resin rust inhibitor, antioxidant, corrosion inhibitor, polymerization inhibitor and solution A are first mixed and dispersed for 20 to 30 minutes, and then the processing aid and adhesion improver are added and dispersed for another 15 to 20 minutes to obtain the water-based rust inhibitor.

[0069] Compared with the prior art, the present invention has the following beneficial effects:

[0070] The resin rust inhibitor provided by this invention has good water solubility due to its rich hydroxyl content, and can be used to prepare water-based rust inhibitors. The resulting water-based rust inhibitor has excellent adhesion and high and low temperature resistance. It still has good adhesion at a low temperature of -20±2℃ and does not experience excessive loss at a high temperature of 89±1℃. Detailed Implementation

[0071] The present invention will be further described below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise stated, the raw materials and reagents used in the embodiments of the present invention are conventionally purchased raw materials and reagents.

[0072] The raw material information used in each embodiment and comparative example is as follows:

[0073] Tetraglycidyl-4,4'-diaminodiphenylmethane: MF-4101H resin, CAS No. 28768-32-3, purchased from Hubei Zhenzhengfeng New Materials Co., Ltd.

[0074] Nano SiO2: 99.5% purity, 20±5nm particle size, purchased from Maclean Biochemical Technology Co., Ltd.

[0075] Example 1

[0076] A resin rust inhibitor, designated as 2% nano-SiO2 modified epoxy resin, is prepared by reacting 1 part by weight of tetraglycidyl-4,4'-diaminodiphenylmethane, 3 parts by weight of diisopropanolamine, 0.062 parts by weight of KH-550 silane coupling agent, and 0.02 parts by weight of nano-SiO2.

[0077] The preparation method of the resin rust inhibitor in this embodiment includes the following steps:

[0078] S1. First, dissolve tetraglycidyl-4,4'-diaminodiphenylmethane in ethanol at 65℃, then raise the temperature to 80℃, mix diisopropanolamine with tetraglycidyl-4,4'-diaminodiphenylmethane and react for 2h, add glacial acetic acid to adjust the pH to neutral, continue the reaction for 30min, and dry to obtain modified tetraglycidyl-4,4'-diaminodiphenylmethane;

[0079] S2. Under reflux stirring at 65℃, silane coupling agent and nano-SiO2 were added to a solvent consisting of ethanol and water in a volume ratio of 9:1, and the pH of which had been adjusted to 2 by hydrochloric acid. The mixture was ultrasonically dispersed for 30 min, and then the modified tetraglycidyl-4,4'-diaminodiphenylmethane obtained in step S1 was added to react for 30 min. After the reaction, the mixture was dried to obtain the resin rust inhibitor.

[0080] Example 2

[0081] A resin rust inhibitor, designated as 3% nano-SiO2 modified epoxy resin, is prepared by reacting 1 part by weight of tetraglycidyl-4,4'-diaminodiphenylmethane, 3 parts by weight of diisopropanolamine, 0.062 parts by weight of KH-550 silane coupling agent, and 0.03 parts by weight of nano-SiO2.

[0082] The preparation method of the resin rust inhibitor in this embodiment is consistent with that in Example 1.

[0083] Examples 3-8

[0084] This embodiment provides a method for preparing a series of water-based rust inhibitors with different components or different mass fractions, including the following steps:

[0085] (1) Mix surfactant, defoamer and water at 45℃ to obtain solution A;

[0086] (2) At 87°C, first mix the resin rust inhibitor, antioxidant, corrosion inhibitor, polymerization inhibitor and solution A, disperse for 25 min, then add the processing aid and adhesion improver, and continue to disperse for 18 min to obtain the water-based rust inhibitor.

[0087] The preparation method of the above-mentioned processing aid includes the following steps:

[0088] Dissolve 1.5 parts of isomeric tridecyl alcohol polyoxyethylene ether, 1.5 parts of fatty secondary alcohol polyoxyethylene ether, 0.15 parts of nano titanium dioxide, 1.5 parts of sodium citrate pentahydrate, 1.5 parts of benzotriazole, 1.5 parts of tert-butylhydroquinone, 1.5 parts of phenothiazine, 2.5 parts of borax, 3.5 parts of urea, and 1.5 parts of ammonium persulfate in 22 parts of water, mix well, and react at 75°C for 1.5 hours to obtain the additive.

[0089] The components and their mass fractions of the water-based rust inhibitors in Examples 3-8 are shown in Table 1 below:

[0090] Table 1. Components and mass fractions of water-based rust inhibitors in Examples 3-8

[0091]

[0092]

[0093] Comparative Example 1

[0094] A resin rust inhibitor, designated as 1% nano-SiO2 modified epoxy resin, is prepared by reacting 1 part by weight of tetraglycidyl-4,4'-diaminodiphenylmethane, 3 parts by weight of diisopropanolamine, 0.062 parts by weight of KH-550 silane coupling agent, and 0.01 parts by weight of nano-SiO2.

[0095] The preparation method of the resin rust inhibitor in this embodiment is consistent with that in Example 1.

[0096] Comparative Example 2

[0097] A resin rust inhibitor is prepared by reacting 1 part by weight of tetraglycidyl-4,4'-diaminodiphenylmethane, 0.062 parts by weight of KH-550 silane coupling agent, and 0.02 parts by weight of nano-SiO2.

[0098] The preparation method of the resin rust inhibitor in this embodiment differs from that in Example 1 only in that diisopropanolamine is not added in step S1.

[0099] Comparative Example 3

[0100] A resin rust inhibitor is prepared by reacting 1 part by weight of tetraglycidyl-4,4'-diaminodiphenylmethane, 3 parts by weight of diisopropanolamine, and 0.062 parts by weight of KH-550 silane coupling agent.

[0101] The preparation method of the resin rust inhibitor in this embodiment differs from that in Example 1 only in that nano-SiO2 is not added in step S2.

[0102] Comparative Example 4

[0103] A resin rust inhibitor is prepared by reacting 1 part by weight of tetraglycidyl-4,4'-diaminodiphenylmethane, 8 parts by weight of diisopropanolamine, 0.062 parts by weight of KH-550 silane coupling agent and 0.02 parts by weight of nano-SiO2.

[0104] The preparation method of the resin rust inhibitor in this embodiment is consistent with that in Example 1.

[0105] Comparative Example 5

[0106] A water-based rust inhibitor, wherein the only difference from Example 3 is:

[0107] The resin rust inhibitor obtained in Example 1 was replaced with E-44 epoxy resin.

[0108] The preparation method of the water-based rust inhibitor in this comparative example is consistent with that in Example 3.

[0109] Comparative Example 6

[0110] A water-based rust inhibitor, wherein the only difference from Example 3 is:

[0111] The rust inhibitor obtained in Example 1 was replaced with E-51 epoxy resin.

[0112] The preparation method of the water-based rust inhibitor in this comparative example is consistent with that in Example 3.

[0113] Comparative Example 7

[0114] A water-based rust inhibitor, wherein the only difference from Example 3 is:

[0115] The resin rust inhibitor obtained in Example 1 was replaced with the resin rust inhibitor obtained in Comparative Example 1.

[0116] The preparation method of the water-based rust inhibitor in this comparative example is consistent with that in Example 3.

[0117] Comparative Example 8

[0118] A water-based rust inhibitor, wherein the only difference from Example 3 is:

[0119] The resin rust inhibitor obtained in Example 1 was replaced with the resin rust inhibitor obtained in Comparative Example 2.

[0120] The preparation method of the water-based rust inhibitor in this comparative example is consistent with that in Example 3.

[0121] Comparative Example 9

[0122] A water-based rust inhibitor, wherein the only difference from Example 3 is:

[0123] The resin rust inhibitor obtained in Example 1 was replaced with the resin rust inhibitor obtained in Comparative Example 3.

[0124] The preparation method of the water-based rust inhibitor in this comparative example is consistent with that in Example 3.

[0125] Comparative Example 10

[0126] A water-based rust inhibitor, wherein the only difference from Example 3 is:

[0127] The resin rust inhibitor obtained in Example 1 was replaced with the resin rust inhibitor obtained in Comparative Example 4.

[0128] The preparation method of the water-based rust inhibitor in this comparative example is consistent with that in Example 3.

[0129] Performance testing

[0130] The water-based rust inhibitors obtained in the examples and comparative examples were subjected to comprehensive performance tests, and the steps of each test are as follows:

[0131] Salt spray test: conducted in accordance with the provisions of GB / T 10125-2012.

[0132] Damp heat test: Conducted in accordance with GB / T 2361-1992.

[0133] Defoaming test: conducted in accordance with ASTM E2407-2004 (2009).

[0134] Corrosion test: Conducted in accordance with GB / T 6144, under the conditions of 55℃±2℃ for cast iron for 24 hours.

[0135] Low temperature adhesion test: conducted in accordance with SH / T 0211-1998, under conditions of -20℃±2℃ for 1 hour.

[0136] Heat loss resistance test: conducted in accordance with JB / T 4216-1999, under conditions of 89℃±1℃ for 4h.

[0137] The performance test data is shown in Table 2 below:

[0138] Table 2. Comprehensive performance test results of the water-based rust inhibitors obtained in the examples and comparative examples.

[0139]

[0140]

[0141] It can be concluded from the data in Table 1 that the products of each embodiment of the present invention have excellent comprehensive performance. The salt spray test duration can reach more than 36 hours, the damp heat test duration is as high as more than 528 hours, the data of the low-temperature adhesion test are all qualified, and the data of the heat loss resistance test also reach the qualified level, indicating that the product has good high-temperature and low-temperature resistance, good adhesion and high stability. By comparing Examples 3 to 8, it can be seen that when preparing with 2% of the high-temperature-resistant epoxy resin MF-4101H modified with nano-silica, the rust prevention performance of the rust preventive liquid is better. By comparing Examples 1, 5 to 6, it can be seen that when the content of the high-temperature-resistant epoxy resin MF-4101H modified with nano-silica is too high, it has little improvement on the performance of the water-based rust preventive liquid and increases the cost. According to Examples 1, 7 to 8, the resin rust inhibitor in the present invention can be used in combination with different additives to prepare the rust preventive liquid.

[0142] By comparing the test data of Examples 3 to 8 with those of Comparative Examples 5 to 6, it can be seen that adding the high-temperature-resistant epoxy resin MF-4101H modified with nano-silica in Examples 3 to 8 of the present invention can significantly improve the salt spray corrosion resistance, extend the metal damp heat corrosion cycle, improve the low-temperature adhesion ability, and enhance the heat loss resistance performance. In Comparative Examples 5 to 6, the high-temperature and low-temperature resistance of epoxy resins E-51 and E-44 is inferior to that of the tetra-glycidyl-4,4'-diaminodiphenylmethane modified with nano-silica. Especially in Comparative Example 6, the rust preventive liquid prepared with E-51 epoxy resin as the rust inhibitor also has inferior rust prevention performance compared with the present invention. Comparative Example 7 shows that when the amount of nano-silica used for modifying the epoxy resin is too low, the performance of the obtained rust preventive liquid is also insufficient. According to Comparative Examples 8 to 10, when modifying tetra-glycidyl-4,4'-diaminodiphenylmethane, diisopropanolamine, KH-550 silane coupling agent, and nano-SiO2 are all indispensable.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A resin rust inhibitor, characterized in that, The preparation raw materials include the following parts by weight: 0.5 to 2 parts tetraglycidyl-4,4'-diaminodiphenylmethane, 1 to 5 parts diisopropanolamine, 0.02 to 0.15 parts silane coupling agent, and 0.01 to 0.1 parts nano-SiO2; The mass ratio of nano-SiO2 to tetraglycidyl-4,4'-diaminodiphenylmethane is (2~3):100; The preparation method of the resin rust inhibitor includes the following steps: S1. Diisopropanolamine and tetraglycidyl-4,4'-diaminodiphenylmethane are mixed and reacted at T℃ to obtain modified tetraglycidyl-4,4'-diaminodiphenylmethane; wherein T≥60℃; S2. After mixing the modified tetraglycidyl-4,4'-diaminodiphenylmethane, silane coupling agent and nano-SiO2 obtained in step S1 in a solution environment, the resin rust inhibitor can be obtained.

2. The resin rust inhibitor as described in claim 1, characterized in that, The particle size of the nano-SiO2 is 20±5nm.

3. The resin rust inhibitor as described in claim 1, characterized in that, The silane coupling agent is an amino-based silane coupling agent.

4. The method for preparing the resin rust inhibitor according to any one of claims 1 to 3, characterized in that, Includes the following steps: S1. Diisopropanolamine and tetraglycidyl-4,4'-diaminodiphenylmethane are mixed and reacted at T℃ to obtain modified tetraglycidyl-4,4'-diaminodiphenylmethane; wherein T≥60℃; S2. After mixing the modified tetraglycidyl-4,4'-diaminodiphenylmethane, silane coupling agent and nano-SiO2 obtained in step S1 in a solution environment, the resin rust inhibitor can be obtained.

5. A water-based rust inhibitor, characterized in that, The components of the water-based rust inhibitor include the resin rust inhibitor described in any one of claims 1 to 4.

6. The water-based rust inhibitor as described in claim 5, characterized in that, The components also include at least one of the following: solution, antioxidant, corrosion inhibitor, polymerization inhibitor, adhesion modifier, surfactant, defoamer, and processing aid; the solution includes water.

7. The water-based rust inhibitor as described in claim 6, characterized in that, Includes the following components, calculated by parts by mass: 20-45 parts resin rust inhibitor, 5-12 parts antioxidant, 0.2-1 part corrosion inhibitor, 0.5-1.5 parts polymerization inhibitor, 5-15 parts adhesion improver, 2-4 parts surfactant, 0.1-1 part defoamer, 2-5 parts processing aid, and 300 parts water.

8. The water-based rust inhibitor as described in any one of claims 5 to 7, characterized in that, The mass ratio of the resin rust inhibitor to water is (30~35):

300.

9. The method for preparing the water-based rust inhibitor according to claim 6 or 7, characterized in that, Includes the following steps: (1) Mix the surfactant, defoamer and water at 40~50℃ to obtain solution A; (2) Mix the remaining components in solution A at 85~90℃ to obtain water-based rust inhibitor.

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