A metal corrosion protective impregnant and a method for preparing the same

Abstract

This invention discloses a metal corrosion protective impregnating agent and its preparation method, relating to the field of organic impregnating agents. The impregnating agent comprises: a monofunctional acrylate monomer, a difunctional acrylate monomer, a polyfunctional acrylate monomer, a metal corrosion protective reactive monomer, a surfactant, a polymerization inhibitor, and an initiator; the metal corrosion protective reactive monomer has the structural formula [formula missing] or [formula missing], where R is a hydrocarbon group containing at least one alkenyl group and consisting of C5-C18 atoms. This invention uses benzimidazole-2-carboxylic acid ester as the reactive monomer, which is chemically bonded and cured with the acrylate monomer upon heating. This imparts the impregnating agent with low viscosity, high hardness, high heat resistance, and high aging resistance. More importantly, this impregnating agent possesses excellent metal corrosion protection properties, preventing corrosion from tap water during the cleaning of ADC12 die-cast parts, avoiding subsequent removal of corrosion spots and rust prevention processes, effectively reducing processing difficulty and production costs.

Description

Technical Field

[0001] This invention relates to the field of organic impregnating agents, and more specifically to a metal corrosion protective impregnating agent and its preparation method. Background Technology

[0002] ADC12 aluminum alloy is one of the most widely used die-casting aluminum alloys in the world, applied in new energy vehicles, aerospace, hydraulic systems, etc. It belongs to the Al-Si-Cu alloy system. Its high silicon content of 9.6%~12.0% is the key to its "easy casting" characteristic. It also has high thermal stability and good welding performance. Due to its excellent comprehensive performance, it is known as the "all-rounder" in the die-casting industry.

[0003] During the die-casting process, ADC12 alloy generates numerous micropores or cracks, requiring the use of impregnating agents for sealing and reinforcement. Currently, the most widely used impregnating agents are third-generation organic impregnating agents, represented by methacrylates. These are liquid substances formulated from acrylate monomers of different functionalities in a specific ratio, supplemented with initiators, polymerization inhibitors, and surfactants. The core advantages of this type of impregnating agent lie in its low viscosity (6~15 mPa·s) and strong permeability, allowing it to quickly penetrate micropores smaller than 0.5 mm. After thermosetting, it forms a high-hardness (Shore hardness (D) > 80) thermosetting polymer, firmly filling pores and cracks, achieving dual physical and chemical protection from within. Moreover, the impregnating agent polymer exhibits strong high-temperature resistance, capable of withstanding temperatures of 150~200℃ for extended periods and adapting to relatively harsh working conditions.

[0004] CN1175069C discloses a methacrylate-type vacuum impregnating agent for sealing and reinforcing, which is composed of a combination crosslinking agent consisting of methacrylate monomers, initiators, polymerization inhibitors, and a small amount of monobenzene ring diene compounds combined with tri- or tetrafunctional methacrylates. This impregnating agent meets the requirements for high hardness and also has significantly improved thermal properties, making it a relatively ideal sealing and reinforcing agent for metal parts.

[0005] After impregnation, a necessary step is to remove any residual impregnating agent from the workpiece surface with tap water. Because chlorination in tap water produces hypochlorous acid, making the water weakly acidic (pH=6.0-6.5), and because the water is rich in O2 and Cl-... - Ca 2+ Mg 2+ In a weakly acidic environment, ADC12 castings will be rapidly oxidized and corroded, causing their surface to turn black or develop white spots ("flow marks"). This is because the high silicon content is precipitated and embedded in the oxide film during the anodizing process, resulting in light scattering and appearing as gray-black or white spots ("flow marks").

[0006] Clearly, corrosion of castings caused by the cleaning process necessitates additional rust removal and prevention steps, which undoubtedly increases processing difficulty and production costs. Therefore, developing environmentally friendly organic impregnating agents with metal corrosion protection properties suitable for high-silicon content aluminum alloy die castings (ADC12) has become an urgent requirement in this field. Summary of the Invention

[0007] The purpose of this invention is to provide a metal corrosion protective impregnating agent and its preparation method.

[0008] This invention uses a novel benzimidazole-2-carboxylic acid ester as a reactive monomer, which is chemically bonded and cured with acrylate monomers by heating. This imparts the impregnating agent with low viscosity, high hardness, high heat resistance, and high aging resistance. More importantly, the impregnating agent has excellent metal corrosion protection properties, which can prevent tap water from causing corrosion when cleaning ADC12 die castings, avoiding subsequent removal of corrosion spots and rust prevention processes, and effectively reducing processing difficulty and production costs.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a metal corrosion protective impregnating agent, comprising the following components in parts by weight: 40-50 parts of monofunctional acrylate monomer, 25-35 parts of difunctional acrylate monomer, 10-15 parts of polyfunctional acrylate monomer, 10-15 parts of metal corrosion protective reactive monomer, 0.05-0.5 parts of surfactant, 0.1-0.3 parts of polymerization inhibitor, and 0.3-0.8 parts of initiator; The metal corrosion protective reactive monomer is benzimidazole-2-carboxylic acid ester, and its structural formula is: or

[0010] Wherein, R is a hydrocarbon group containing at least one alkenyl group and having 5 to 18 carbon atoms.

[0011] According to the metal corrosion protective impregnating agent of the present invention, preferably, the olefinic alcohol corresponding to RO- is selected from at least one of 3-methyl-3-buten-1-ol, cis-3-hexen-1-ol (leaf alcohol), 6-nonen-1-ol, styrene alcohol (cinnamyl alcohol), and (4-vinylphenyl)methanol, 3,7-dimethyl-2,6-octadien-1-ol (geraniol), 10-undecenol, cis-9-hexadecenol (palm oil alcohol), and cis-9-octadecenol (olive oil alcohol).

[0012] According to the metal corrosion protective impregnating agent of the present invention, preferably, the benzimidazole-2-carboxylic acid ester is obtained by esterification reaction of benzimidazole-2-carboxylic acid with the olefinic alcohol.

[0013] Specifically, the benzimidazole-2-carboxylic acid is benzimidazole-2-carboxylic acid or benzimidazole-2-acetic acid; because the carbonyl oxygen atom in benzimidazole-2-carboxylic acid and 2-acetic acid is more readily reacted with the nitrogen atom on the imidazole ring and Mg in water. 2+ Ca 2+ The metal ions coordinate to form stable five- or six-membered ring complexes, while simultaneously preventing O2 and Cl from reacting. - This protects the aluminum alloy from corrosion and prevents it from penetrating.

[0014] In this invention, the term "hydrocarbon group" includes aliphatic hydrocarbon groups and aromatic hydrocarbon groups. The term "olefin alcohol" refers to a hydrocarbon alcohol containing an alkenyl group.

[0015] In the metal corrosion protective impregnating agent according to the present invention, preferably, the monofunctional acrylate monomer is selected from alkyl esters having 5-25 carbon atoms; more preferably, it is selected from at least one of hydroxyethyl methacrylate, hydroxypropyl methacrylate, octyl methacrylate, isodecyl methacrylate, isobornyl methacrylate, lauryl methacrylate, diethylene glycol ethyl ether methacrylate, tridecanol methacrylate, tetradecanol methacrylate, and octadecyl methacrylate. More preferably, the monofunctional acrylate monomer is selected from at least one of hydroxyethyl methacrylate, lauryl methacrylate, and isodecyl methacrylate.

[0016] According to the metal corrosion protective impregnating agent of the present invention, preferably, the difunctional acrylate is selected from dialkyl esters having a carbon number of 10-25; more preferably, it is selected from at least one of dimethyl methacrylate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethyl diacrylate, 1,10-decanediol dimethacrylate, triethylene glycol dimethacrylate, and tripropylene glycol diacrylate. More preferably, the difunctional acrylate is selected from at least one of 1,6-hexanediol dimethyl diacrylate, 1,10-decanediol dimethacrylate, and triethylene glycol dimethacrylate.

[0017] According to the metal corrosion protective impregnating agent of the present invention, preferably, the multifunctional acrylate is selected from one of tri- or tetraalkyl esters having 12-30 carbon atoms; the present invention preferably selects at least one of trimethylolpropane triacrylate (TMPTA), trimethylolpropane trimethacrylate (TMPTMA), pentaerythritol triacrylate (PETA), and pentaerythritol tetraacrylate (PET4A).

[0018] According to the metal corrosion protective impregnating agent of the present invention, preferably, the initiator is selected from peroxide or azo compound initiators; for example, at least one selected from lauroyl peroxide, diisopropylbenzene peroxide, tert-butyl peroxide, azobisisobutyronitrile, azobisisoheptanenitrile, and dimethyl azobisisobutyronitrile.

[0019] According to the metal corrosion protective impregnating agent of the present invention, preferably, the initiator is azobisisoheptanenitrile or / and dimethyl azobisisobutyrate.

[0020] In the metal corrosion protective impregnating agent according to the present invention, preferably, the polymerization inhibitor is selected from at least one of hydroquinone, benzoquinone, anthraquinone, 1,4-naphthoquinone, tert-butylcatechol, and 2,6-dibutyl-p-cresol. More preferably, the polymerization inhibitor is 2,6-dibutyl-p-cresol.

[0021] According to the metal corrosion protective impregnating agent of the present invention, preferably, the surfactant is selected from at least one of polyoxyethylene sorbitan monooleate, polyoxyethylene hexadecyl ether, isotridecyl polyoxyethylene polyoxypropylene ether, fatty acid polyoxyethylene ester or polyethylene glycol laurate, and polyoxyethylene castor oil.

[0022] Another invention provides a method for preparing any one of the above-mentioned metal corrosion protective impregnating agents, wherein the preparation method includes the following steps: The monofunctional acrylate monomer, difunctional acrylate monomer, polyfunctional acrylate monomer, metal corrosion protective reactive monomer, surfactant, polymerization inhibitor and initiator are mixed evenly to obtain the metal corrosion protective impregnating agent.

[0023] According to the preparation method of the present invention, the mixing is preferably carried out by stirring at room temperature.

[0024] According to the preparation method of the present invention, preferably, the metal corrosion protective reactive monomer is obtained by esterification reaction of benzimidazole-2-carboxylic acid with an olefinic alcohol, wherein the benzimidazole-2-carboxylic acid is benzimidazole-2-carboxylic acid or benzimidazole-2-acetic acid.

[0025] More preferably, the olefin alcohol is selected from at least one of 3-methyl-3-buten-1-ol, cis-3-hexen-1-ol (leaf alcohol), 6-nonen-1-ol, styrene alcohol (cinnamyl alcohol), and (4-vinylphenyl)methanol, 3,7-dimethyl-2,6-octadien-1-ol (geraniol), 10-undecenol, cis-9-hexadecenol (palm oil alcohol), and cis-9-octadecenol (olive oil alcohol).

[0026] This invention prepares a novel metal corrosion protectant by esterification of benzimidazole-2-carboxylic acid (formic acid or acetic acid) with an olefinic alcohol, which can effectively prevent O2 and Cl in tap water. - Mg 2+ Ca 2+ To prevent corrosion of ADC12 die-cast parts and avoid the formation of gray spots and flow marks, this excellent metal corrosion protection performance is achieved through the following mechanism: 1) Adsorption film formation: The nitrogen atoms on the imidazole ring can quickly combine with the active sites on the metal surface to form a tight adsorption film, which not only prevents direct contact with corrosive media such as oxygen, chloride ions and moisture, but also inhibits the electrochemical reaction on the metal surface, thereby achieving a significant rust prevention effect.

[0027] 2) Complexation protection: The nitrogen atom and carboxyl oxygen atom on the imidazole ring act as ligands with the metal ion Mg. 2+ Ca 2+ Plasma undergoes a coordination reaction to generate a highly stable metal-imidazolium complex, which further enhances the stability of the adsorption film and effectively prevents the diffusion and migration of metal ions, thus preventing oxidation reactions on the metal surface.

[0028] 3) Antioxidant properties: The nitrogen atom and side chain on the imidazole ring have certain reducing properties, which can capture free radicals and prevent the chain propagation of oxidation reactions; imidazole can also react with oxygen to generate stable oxidation products, thereby reducing the corrosion of metal surfaces by oxygen.

[0029] The metal corrosion protectant used in this invention is a reactive monomer containing alkenyl groups. During the thermosetting process, it chemically bonds with other acrylic monomers to the polymer chain segments, which improves the polymer hardness, thermal stability and dimensional stability, and extends the service life of the impregnated workpiece in high-temperature environments.

[0030] The metal corrosion protectant used in this invention contains benzimidazole, which is a very stable aromatic heterocycle. Therefore, the impregnating agent containing benzimidazole derivatives has strong chemical corrosion resistance after thermosetting. It can better resist the attack and invasion of chemicals such as acids, alkalis, and organic solvents, and significantly improve the durability and reliability of the impregnated workpiece. Attached Figure Description

[0031] Figure 1 The infrared spectrum of metal corrosion protective reactive monomer 2 in Example 2 is shown.

[0032] Figure 2 The 1H NMR spectrum of monomer 2, which is a metal corrosion protective reactive monomer in Example 2.

[0033] Figure 3 The image shows the state of the ADC12 casting after immersion / cleaning with tap water according to Example 1.

[0034] Figure 4 The image shows the state of the ADC12 casting after immersion / cleaning with tap water using Comparative Example 1.

[0035] Figure 5 The image shows the state of the ADC12 casting after immersion / cleaning with tap water using Comparative Example 2. Detailed Implementation

[0036] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0037] All numerical specifications in this invention (e.g., temperature, time, concentration, and weight, including ranges for each) are generally approximate values ​​that may be changed (+) or (-) in increments of 0.1 or 1.0. All numerical specifications are to be understood as being preceded by the term "about".

[0038] Example 1

[0039] This embodiment provides a metal corrosion protective impregnating agent, which is prepared by mixing the following weight proportions: 12 parts hydroxyethyl methacrylate, 33 parts lauryl methacrylate, 25 parts 1,10-decanediol dimethacrylate, 15 parts trimethylolpropane triacrylate, 14 parts metal corrosion protective reactive monomer 1, 0.5 parts dimethyl azobisisobutyrate, 0.3 parts 2,6-dibutyl-p-cresol, and 0.2 parts polyoxyethylene sorbitan monooleate.

[0040] Preparation method of the metal corrosion protective reactive monomer 1: 8.1 g (0.05 mol) of benzimidazole-2-carboxylic acid, 4.3 g (0.05 mol) of 3-methyl-3-buten-1-ol, 50 mL of cyclohexane, and 0.5 g of catalyst CuSO4 / Fe2(SO4)3 (1:1) were added to a round-bottom flask. A water separator and reflux apparatus were installed, and the mixture was heated to reflux. The reaction ended when the water level in the separator reached approximately 0.9 mL. The mixture was cooled and filtered to separate the catalyst. The reaction solution was dissolved in ethyl acetate and washed with saturated Na2CO3 solution and brine, respectively. The ester layer was dried, and the ethyl acetate was removed. Recrystallization from cyclohexane yielded monomer 1, a metal corrosion protective reactant, with a yield of 83% and the structural formula [not specified]. .

[0041] IR (KBr, cm) -1 ): 3487, 1639, 1507, 830.

[0042] 1HNMR (CDCl3, ppm): 2.04 (s, 3H), 2.83 (d, 2H), 4.37 (d, 2H), 6.11 (d, 1H), 6.31 (s, 1H), 7.95 (d, 2H), 8.48 (d, 2H), 12.93 (br, s, 1H).

[0043] Example 2

[0044] This embodiment provides a metal corrosion protective impregnating agent, which is prepared by mixing the following weight proportions: 15 parts hydroxyethyl methacrylate, 35 parts isodecyl methacrylate, 27 parts 1,6-hexanediol dimethyl diacrylate, 10 parts trimethylolpropane trimethacrylate, 12 parts metal corrosion protective reactive monomer 2, 0.5 parts dimethyl azobisisobutyrate, 0.3 parts 2,6-dibutyl-p-cresol, and 0.2 parts polyoxyethylene dehydrated sorbitan monooleate.

[0045] The preparation method of the metal corrosion protective reactive monomer 2 is the same as in Example 1, except that 3-methyl-3-buten-1-ol (4.3 g, 0.05 mol) is replaced with cinnamyl alcohol (6.7 g, 0.05 mol). The structural formula of the metal corrosion protective reactive monomer 2 is as follows: Yield: 92%.

[0046] like Figure 1 and Figure 2 As shown, IR (KBr, cm -1 ): 3529, 1693, 1500, 780.

[0047] 1 HNMR (CDCl3, ppm): 4.34 (s, 2H), 6.64 (d, 1H), 6.84 (d, 1H), 7.39 (s, 2H), 7.48 ( s, 1H), 7.75 (s, 2H), 7.98 (2H, m), 8.53 (d, 1H), 8.75 (s, 1H), 13.53 (br, s, 1H).

[0048] Example 3

[0049] This embodiment provides a metal corrosion protective impregnating agent, which is prepared by mixing the following weight proportions: 13 parts hydroxyethyl methacrylate, 27 parts tridecanol methacrylate, 35 parts triethylene glycol dimethacrylate, 14 parts pentaerythritol triacrylate, 10 parts metal corrosion protective reactive monomer 3, 0.5 parts dimethyl azobisisobutyrate, 0.2 parts 2,6-dibutyl-p-cresol, and 0.3 parts polyoxyethylene dehydrated sorbitan monooleate.

[0050] Preparation method of the metal corrosion protective reactive monomer 3: Benzimidazole-2-acetic acid (8.8 g, 0.05 mol), 10-undecenol (8.5 g, 0.05 mol), 50 mL of cyclohexane, and 0.5 g of catalyst CuSO4 / Fe2(SO4)3 (1:1) were added to a round-bottom flask. A water separator and reflux apparatus were installed, and the mixture was heated to reflux. The reaction was stopped when approximately 0.9 mL of water appeared in the water separator. The mixture was cooled and filtered to separate the catalyst. The reaction solution was dissolved in ethyl acetate and washed with saturated Na2CO3 solution and brine, respectively. The ester layer was dried, and the ethyl acetate was removed. Cyclohexane was recrystallized to give monomer 3, a metal corrosion protective reactant, with a yield of 78% and the structural formula [not provided]. .

[0051] IR (KBr, cm) -1 ): 3433, 1617, 1503, 820.

[0052] 1 HNMR (CDCl3, ppm): 1.72-1.76 (m, 10H), 1.77 (m, 2H), 1.79 (m, 2H), 2.54 (dd, 2H), 3.77 (s, 2H), 4.4 4 (dd, 2H), 5.14 (d, 1H), 5.27 (d, 1H), 5.88 (m, 1H), 7.88 (dd, 2H), 8.33 (dd, 2H), 12.86 (br, s, 1H).

[0053] Example 4

[0054] This embodiment provides a metal corrosion protective impregnating agent, which is prepared by mixing the following weight proportions: 16 parts hydroxyethyl methacrylate, 27 parts lauryl methacrylate, 29 parts 1,10-decanediol dimethacrylate, 12 parts trimethylolpropane trimethacrylate, 15 parts metal corrosion protective reactive monomer 4, 0.5 parts dimethyl azobisisobutyrate, 0.3 parts 2,6-dibutyl-p-cresol, and 0.2 parts polyoxyethylene dehydrated sorbitan monooleate.

[0055] The preparation method of the metal corrosion protective reactive monomer 4 is the same as in Example 3, except that 10-undecenol (8.5 g, 0.05 mol) is replaced with leaf alcohol (5.0 g, 0.05 mol). The structural formula of the metal corrosion protective reactive monomer 4 is as follows: Yield: 84%.

[0056] IR (KBr, cm) -1 ): 3397, 1621, 1501, 792.

[0057] 1HNMR (CDCl3, ppm): 0.93 (s, 3H), 2.37 (m, 2H), 2.43 (m, 2H), 3.99 (s, 2H), 4.77 (d, 2H), 5.63 (d, 2H), 7.87 (d, 2H), 8.01 (d, 2H), 12.73 (br, s, 1H).

[0058] Comparative Example 1

[0059] This comparative example is based on Example 1, but lacks the metal corrosion protective reactive monomer 1. It was actually prepared by mixing the following components in parts by weight at room temperature with stirring: 18 parts hydroxyethyl methacrylate, 36 parts lauryl methacrylate, 30 parts decanediol dimethacrylate, 15 parts trimethylolpropane triacrylate, 0.5 parts dimethyl azobisisobutyrate, 0.3 parts 2,6-dibutyl-p-cresol, and 0.2 parts polyoxyethylene sorbitan monooleate.

[0060] Comparative Example 2

[0061] This comparative example uses formula 2 from invention patent CN1175069C, and is prepared by mixing the following components in parts by weight: 85 parts diethylene glycol dimethacrylate, 15 parts lauryl methacrylate, 5 parts trimethylolpropane trimethacrylate, 2 parts diallyl phthalate, 2 parts nonylphenol polyoxyethylene ether surfactant (OP-10), 1 part benzoyl peroxide initiator (BPO), 0.04 parts di-tert-butyl-p-cresol, and 0.02 parts hydroquinone polymerization inhibitor.

[0062] The following performance tests were conducted on the impregnating agents prepared in Examples 1-4 and Comparative Examples 1-2: 1) Viscosity: Tested according to GB / T2794-2013 Adhesives Viscosity Determination Single Cylindrical Rotation Viscometer Method.

[0063] 2) Hardness of the glue stick: Tested according to GB / T531.1-2008 Shore hardness test method.

[0064] 3) High-temperature sealing performance at 204℃: The test ring is impregnated with the organic impregnating agent specified in the US military standard MIL-I-17563C. After vacuum impregnation with the impregnating agent, it is placed in water at 90~95℃ for curing for 20~30 minutes. Then it is taken out and placed in a constant temperature aging chamber at 204℃ for 42 days. After the aging period, it is taken out, cooled to room temperature, and then the sealing performance is tested using the sealing performance test device specified in MIL-I-17563C. If there is no leakage, it indicates that the test sample has good high-temperature resistance at 204℃; otherwise, the high-temperature resistance at 204℃ is poor.

[0065] 4) Aging resistance: The test ring is impregnated with the organic impregnating agent specified in the US military standard MIL-I-17563C. After vacuum impregnation with the impregnating agent, it is placed in water at 90~95℃ for 20~30 minutes for curing. Then it is removed and placed in the following aging environments: ethylene glycol, 149℃, 14 days; hydraulic oil, 99℃, 14 days; alcohol, 23℃, 2 days; 18% sulfuric acid solution, 23℃, 2 hours. After the expiration period, it is removed and the sealing performance is tested using the sealing test device specified in MIL-I-17563C. If there is no leakage, it indicates that the aging resistance of the test sample is good; otherwise, the aging resistance is poor.

[0066] 5) Corrosion Protection Performance: ADC12 die-cast parts from the same batch were impregnated using the impregnating agents described in Examples 1-4 and Comparative Examples 1-2, respectively. The die-cast parts were then repeatedly rinsed under high pressure with tap water (pH=6.4). After removing residual adhesive from the casting surface, they were centrifuged and dried. The surface of the castings was then observed for any corrosion marks. Figure 3 The image shows the state of the ADC12 casting after immersion / washing with tap water according to Example 1. Figure 4 The image shows the condition of the ADC12 casting after immersion / washing with tap water using Comparative Example 1. Figure 5 The image shows the state of the ADC12 casting after immersion / cleaning with tap water using Comparative Example 2.

[0067] Table 1 Performance Comparison of Examples and Comparative Examples

[0068] As can be seen from Table 1, in Examples 1-4, adding 10%-15% of metal corrosion protective reactive monomers can give the impregnating agent highly effective protection against corrosion of ADC12 die castings by cleaning water, while maintaining the impregnating agent's low viscosity, high curing hardness, high temperature sealing performance and aging resistance.

[0069] Comparative Example 1 is based on Example 1, but lacks the metal corrosion protective reactive monomer 1. When the ADC12 casting was impregnated with the impregnating agent of Comparative Example 1 and washed with tap water at pH=6.4, a large number of "flow marks" appeared (e.g. Figure 4 As shown in the figure, Comparative Example 1 does not have the effect of protecting against metal corrosion.

[0070] Comparative Example 2, using the patented formula CN1175069C, also lacked a metal corrosion protectant. When the ADC12 casting was impregnated with the penetrant from Comparative Example 2 and then washed with tap water at pH 6.4, gray spots and "flow marks" appeared (e.g.) Figure 5 As shown in the figure, Comparative Example 2 does not have the effect of protecting against metal corrosion.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A metal corrosion protective impregnating agent, characterized in that, The metal corrosion protective impregnating agent comprises the following components in parts by weight: 40-50 parts of monofunctional acrylate monomer, 25-35 parts of difunctional acrylate monomer, 10-15 parts of polyfunctional acrylate monomer, 10-15 parts of metal corrosion protective reactive monomer, 0.05-0.5 parts of surfactant, 0.1-0.3 parts of polymerization inhibitor, and 0.3-0.8 parts of initiator; The metal corrosion protective reactive monomer is benzimidazole-2-carboxylic acid ester, and its structural formula is: or Wherein, R is a hydrocarbon group containing at least one alkenyl group and having 5 to 18 carbon atoms.

2. The metal corrosion protective impregnating agent according to claim 1, characterized in that, The olefin alcohol corresponding to RO is selected from at least one of 3-methyl-3-buten-1-ol, cis-3-hexen-1-ol, 6-nonen-1-ol, styrenepropenol, and (4-vinylphenyl)methanol, 3,7-dimethyl-2,6-octadien-1-ol, 10-undecenol, cis-9-hexadecenol, and cis-9-octadecenol.

3. The metal corrosion protective impregnating agent according to claim 2, characterized in that, The benzimidazole-2-carboxylic acid ester is obtained by esterification of benzimidazole-2-carboxylic acid or benzimidazole-2-acetic acid with the olefin alcohol.

4. The metal corrosion protective impregnating agent according to claim 1, characterized in that, The monofunctional acrylate monomer is selected from at least one of hydroxyethyl methacrylate, hydroxypropyl methacrylate, octyl methacrylate, isodecyl methacrylate, isobornyl methacrylate, lauryl methacrylate, diethylene glycol ethyl ether methacrylate, tridecanol methacrylate, tetradecanol methacrylate, and octadecyl methacrylate.

5. The metal corrosion protective impregnating agent according to claim 1, characterized in that, The bifunctional acrylate is selected from at least one of dimethyl acrylate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethyl diacrylate, 1,10-decanediol dimethacrylate, triethylene glycol dimethacrylate, and tripropylene glycol diacrylate.

6. The metal corrosion protective impregnating agent according to claim 1, characterized in that, The multifunctional acrylate is selected from at least one of trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, and pentaerythritol tetraacrylate.

7. The metal corrosion protective impregnating agent according to claim 1, characterized in that, The initiator is selected from at least one of lauroyl peroxide, diisopropylbenzene peroxide, tert-butyl peroxide, azobisisobutyronitrile, azobisisoheptanenitrile, and dimethyl azobisisobutyronitrile.

8. The metal corrosion protective impregnating agent according to claim 1, characterized in that, The polymerization inhibitor is selected from at least one of hydroquinone, benzoquinone, anthraquinone, 1,4-naphthoquinone, tert-butylcatechol, and 2,6-dibutyl-p-cresol.

9. The metal corrosion protective impregnating agent according to claim 1, characterized in that, The surfactant is selected from at least one of polyoxyethylene sorbitan monooleate, polyoxyethylene hexadecyl ether, isotridecyl polyoxyethylene polyoxypropylene ether, fatty acid polyoxyethylene ester or polyethylene glycol laurate, and polyoxyethylene castor oil.

10. A method for preparing a metal corrosion protective impregnating agent according to any one of claims 1-9, characterized in that, The preparation method includes the following steps: The monofunctional acrylate monomer, difunctional acrylate monomer, polyfunctional acrylate monomer, metal corrosion protective reactive monomer, surfactant, polymerization inhibitor and initiator are mixed evenly to obtain the metal corrosion protective impregnating agent.

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