Metal surface rust preventive and preparation method thereof

Abstract

The present application relates to metal surface rust-proof treatment technical field, specifically disclose a kind of metal surface rust preventive and preparation method thereof, composite rust inhibitor provided in the present application, under the action of initiator, N-vinyl imidazole and dodecyl succinic acid copolymerization forms high molecular polymer chain, imidazole group on polymer main chain is firmly adsorbed on metal surface by coordination bond, and the long alkyl chain of hydrophobic then constitutes a hydrophobic barrier, prevents corrosive medium from contacting metal surface;Then using EDC and NHS to activate carboxyl on polymer chain, then with amino group on aminothiourea molecule is reacted, aminothiourea molecule is introduced into the polymer chain that has been synthesized, nitrogen and sulfur atom in aminothiourea are all strong coordination atoms, can form extremely stable complex with a variety of metal ions, form a layer of stable protective film on metal surface, so that rust inhibitor has excellent corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of metal surface rust prevention technology, specifically to a metal surface rust prevention liquid and its preparation method. Background Technology

[0002] Metallic materials play a vital role in modern industry, but they are highly susceptible to electrochemical corrosion from moisture, oxygen, and other environmental factors during use and storage, leading to surface rust. This process not only significantly weakens the mechanical strength of metal components, affecting their dimensional accuracy and appearance, but also causes substantial economic losses and resource waste. Therefore, taking effective rust prevention measures to block corrosion paths, extend product lifespan, and ensure reliable equipment operation has become an indispensable and crucial step in manufacturing, warehousing, transportation, and many other industrial sectors.

[0003] Currently, most rust inhibitors on the market use mineral oil or synthetic oil as the base oil and add various rust inhibitor additives. However, simple physical mixing of different rust inhibitor components may result in insufficient synergistic effect, poor density and stability of the rust-preventive film, especially in harsh environments such as humid heat or salt spray, leading to a shorter protection period and difficulty in providing balanced protection for multiple metal materials simultaneously.

[0004] For example, Chinese patent document CN202111683451.6 discloses an environmentally friendly water-based rust inhibitor, its preparation method, and its application. The water-based rust inhibitor provided includes the following raw materials in the following mass percentages: rust inhibitor 5-15%, special amine 5-15%, water-based film-forming agent 1-5%, penetrant 0.5-5%, defoamer 0.01-1%, and water as the balance. Although the salt spray corrosion resistance of the prepared water-based rust inhibitor has been improved to a certain extent, it still needs further improvement. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a metal surface rust inhibitor and its preparation method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A metal surface rust-preventive liquid, by weight, comprises the following raw materials: 10-15 parts base oil, 3-6 parts composite rust inhibitor, 0.5-1 parts emulsified silicone oil, 1-2 parts hydroxyethyl cellulose, 1-2 parts sodium metabisulfite, 2-5 parts benzotriazole, 1-2 parts antioxidant, 1-2 parts antistatic agent, 2-4 parts inositol hexaphosphate, 3-6 parts sodium dodecylbenzenesulfonate, 2-5 parts alkylphenol polyoxyethylene ether, and 40-60 parts deionized water.

[0008] In the technical solution disclosed in this invention, the base oil is the main component of the oil phase. The base oil can spread and adhere to the metal surface to form a continuous, hydrophobic physical barrier film. This film can effectively block moisture and oxygen in the air from directly contacting the metal surface, thereby providing the most basic rust prevention protection.

[0009] In the technical solution disclosed in this invention, the base oil is selected from one or more of machine oil, vegetable oil, silicone oil, and kerosene. The number of parts of the base oil can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0010] In the technical solution disclosed in this invention, the preparation method of the composite rust inhibitor is as follows:

[0011] S1. Dissolve N-vinylimidazolium and dodecenylsuccinic acid in an organic solvent, then add an initiator, heat and stir to react, and obtain a reaction solution;

[0012] S2. Cool the reaction solution to room temperature, add EDC and NHS, stir to activate, then add aminothiourea and continue the reaction. After the reaction is completed, precipitate, filter, wash and vacuum dry to obtain the composite rust inhibitor.

[0013] Specifically, the molar ratio of N-vinylimidazolium, dodecenylsuccinic acid, initiator, EDC, NHS and aminothiourea is 1:1-1.2:0.005-0.01:1.2-1.5:1.2-1.5:1.1-1.3.

[0014] More specifically, the initiator is selected from azobisisobutyronitrile.

[0015] Specifically, in step S1, the temperature for heating and stirring the reaction is 60-70℃, for example, 60℃, 62℃, 65℃, 68℃, or 70℃ can be selected; the time for heating and stirring the reaction is 6-12h, for example, 6h, 7h, 8h, 9h, 10h, 11h, or 12h can be selected, but it is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0016] Specifically, in step S2, the reaction temperature is 30-50℃, for example, 30℃, 32℃, 35℃, 38℃, 40℃, 42℃, 45℃, 48℃, or 50℃ can be selected; the reaction time is 4-8h, for example, 4h, 5h, 6h, 7h, or 8h can be selected, but it is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0017] In the technical solution disclosed in this invention, under the action of an initiator, N-vinylimidazolium and dodecenylsuccinic acid copolymerize to form a high molecular polymer chain. The imidazolium groups on the polymer backbone are firmly adsorbed onto the metal surface through coordination bonds, while the hydrophobic long alkyl chains form a hydrophobic barrier to prevent corrosive media from contacting the metal surface. Then, EDC and NHS are used to activate the carboxyl groups on the polymer chain, and then react with the amino groups on the aminothiourea molecules to introduce the aminothiourea molecules into the synthesized polymer chain. The nitrogen and sulfur atoms in aminothiourea are both strong coordinating atoms, which can form extremely stable complexes with various metal ions, forming a stable protective film on the metal surface, so that the rust inhibitor has excellent anti-corrosion performance.

[0018] In the technical solution disclosed in this invention, the number of parts of the composite rust inhibitor can be 3 parts, 4 parts, 5 parts, or 6 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0019] In the technical solution disclosed in this invention, emulsified silicone oil, as a highly efficient defoamer, can quickly eliminate foam generated during production and stirring. At the same time, it has extremely low surface tension, which can effectively reduce the surface tension of the rust inhibitor, allowing it to better wet and spread on the metal surface. The amount of emulsified silicone oil can be selected as 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 part, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0020] In the technical solution disclosed in this invention, hydroxyethyl cellulose can significantly increase the viscosity of the aqueous phase, prevent the separation of the oil phase and the aqueous phase during storage, and maintain the stability of the emulsion. The amount of hydroxyethyl cellulose can be selected as 1 part, 1.2 parts, 1.5 parts, 1.6 parts, 1.8 parts, or 2 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0021] In the technical solution disclosed in this invention, sodium metabisulfite is used as a reducing agent to consume oxygen in the system and prevent the metal surface from being oxidized. The amount of sodium metabisulfite can be 1 part, 1.2 parts, 1.5 parts, 1.6 parts, 1.8 parts, or 2 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0022] In the technical solution disclosed in this invention, benzotriazole is used as a corrosion inhibitor. The amount of benzotriazole can be selected as 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, or 5 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0023] In the technical solution disclosed in this invention, the antioxidant is selected from antioxidant 1010 or antioxidant 168, and the number of parts of antioxidant can be 1 part, 1.2 parts, 1.5 parts, 1.6 parts, 1.8 parts, or 2 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0024] In the technical solution disclosed in this invention, the antistatic agent is selected from antistatic agent ASA-3. The number of parts of the antistatic agent can be 1 part, 1.2 parts, 1.5 parts, 1.6 parts, 1.8 parts, or 2 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0025] In the technical solution disclosed in this invention, the inositol hexaphosphate ester molecule contains multiple phosphate groups, which can react with various metal ions (such as Fe). 3+ Cu 2+ (etc.) form a stable complex, which plays an excellent role in passivation and rust prevention. The amount of inositol hexaphosphate can be selected as 2 parts, 2.2 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.8 parts, 3 parts, 3.2 parts, 3.5 parts, 3.6 parts, 3.8 parts, or 4 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0026] In the technical solution disclosed in this invention, sodium dodecylbenzenesulfonate is used as an emulsifier. The amount of sodium dodecylbenzenesulfonate can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, or 6 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0027] In the technical solution disclosed in this invention, alkylphenol polyoxyethylene ether is used as an emulsifier. The amount of alkylphenol polyoxyethylene ether can be selected as 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, or 5 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0028] In the technical solution disclosed in this invention, the number of parts of deionized water can be selected as 40 parts, 45 parts, 50 parts, 55 parts, or 60 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0029] The present invention also provides a method for preparing the above-mentioned metal surface rust inhibitor, comprising the following steps:

[0030] (1) Mix the base oil, composite rust inhibitor, benzotriazole, antioxidant, antistatic agent and emulsified silicone oil evenly to obtain mixed solution A;

[0031] (2) Add hydroxyethyl cellulose, sodium metabisulfite and inositol hexaphosphate to deionized water, heat and stir until homogeneous to obtain mixed solution B;

[0032] (3) Mix solution A and solution B, then add sodium dodecylbenzenesulfonate and alkylphenol polyoxyethylene ether, stir evenly to obtain metal surface rust prevention liquid.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The composite rust inhibitor provided by the present invention, under the action of the initiator, N-vinylimidazolium and dodecenylsuccinic acid copolymerize to form a high molecular polymer chain. The imidazolium group on the polymer main chain is firmly adsorbed on the metal surface through coordination bond, while the hydrophobic long alkyl chain forms a hydrophobic barrier to prevent the corrosive medium from contacting the metal surface. Then, EDC and NHS are used to activate the carboxyl group on the polymer chain, and then react with the amino group on the aminothiourea molecule to introduce the aminothiourea molecule into the synthesized polymer chain. The nitrogen and sulfur atoms in aminothiourea are both strong coordinating atoms, which can form extremely stable complexes with a variety of metal ions, forming a stable protective film on the metal surface, so that the rust inhibitor has excellent anti-corrosion performance.

[0035] (2) Compared with the simple physical blending of N-vinylimidazolium, alkenyl succinic acid and aminothiourea, where different molecules adsorb independently on the metal surface, the arrangement of molecules is disordered due to their different sizes, shapes and polarities, resulting in a large number of defects and voids. Corrosive media (water, oxygen, chloride ions) can easily penetrate into the metal surface through these defect channels, causing corrosion. In this invention, the three substances are connected to the polymer chain by strong covalent bonds through a chemical reaction. The polymer chain can be chelated on the metal surface through multiple active sites (imidazolium nitrogen, thiourea sulfur and nitrogen), similar to the "multi-claw anchoring" effect, forming a dense, orderly, and highly hydrophobic protective film, which can greatly enhance its blocking effect on corrosive media and significantly improve its anti-corrosion performance. Detailed Implementation

[0036] The present invention will be further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0037] It should be noted that, unless otherwise specified, all chemical reagents involved in this invention were purchased through commercial channels.

[0038] The machine oil used in this embodiment of the invention is of type L-AN 22; the CAS number of the emulsified silicone oil is 63148-62-9; and the type of alkylphenol polyoxyethylene ether is NP-10.

[0039] Example 1

[0040] A method for preparing a rust-preventive liquid for metal surfaces includes the following steps:

[0041] (1) Mix 10 parts base oil, 3 parts composite rust inhibitor, 2 parts benzotriazole, 1 part antioxidant 168, 1 part antistatic agent ASA-3 and 0.5 parts emulsified silicone oil evenly to obtain mixed solution A;

[0042] (2) Add 1 part hydroxyethyl cellulose, 1 part sodium metabisulfite and 2 parts inositol hexaphosphate to 40 parts deionized water and stir evenly at 60°C to obtain mixed solution B;

[0043] (3) Mix solution A and solution B, then add 3 parts sodium dodecylbenzenesulfonate and 2 parts alkylphenol polyoxyethylene ether NP-10, stir evenly, and emulsify with a high shear emulsifier to obtain a metal surface rust inhibitor.

[0044] The preparation method of the composite rust inhibitor is as follows:

[0045] S1. Dissolve 0.1 mol N-vinylimidazolium and 0.1 mol dodecenylsuccinic acid in 150 mL of organic solvent DMF, then add 0.001 mol of initiator azobisisobutyronitrile, heat and stir at 70 °C for 6 h to obtain the reaction solution;

[0046] S2. Cool the reaction solution to room temperature, add 0.12 mol EDC and 0.12 mol NHS, stir and activate at room temperature for 1 h, then add 0.11 mol aminothiourea, react at 50 °C for 4 h. After the reaction is complete, precipitate, filter, wash and vacuum dry to obtain the composite rust inhibitor.

[0047] Example 2

[0048] A method for preparing a rust-preventive liquid for metal surfaces includes the following steps:

[0049] (1) Mix 15 parts base oil, 6 parts composite rust inhibitor, 5 parts benzotriazole, 2 parts antioxidant 1010, 2 parts antistatic agent ASA-3 and 1 part emulsified silicone oil evenly to obtain mixed solution A;

[0050] (2) Add 2 parts of hydroxyethyl cellulose, 2 parts of sodium metabisulfite and 4 parts of inositol hexaphosphate to 60 parts of deionized water and stir evenly at 60°C to obtain mixed solution B;

[0051] (3) Mix solution A and solution B, then add 5 parts sodium dodecylbenzenesulfonate and 3 parts alkylphenol polyoxyethylene ether NP-10, stir evenly, and emulsify with a high shear emulsifier to obtain a metal surface rust inhibitor.

[0052] The preparation method of the composite rust inhibitor is as follows:

[0053] S1. Dissolve 0.1 mol N-vinylimidazolium and 0.1 mol dodecenylsuccinic acid in 150 mL of organic solvent DMF, then add 0.001 mol of initiator azobisisobutyronitrile, heat and stir at 70 °C for 6 h to obtain the reaction solution;

[0054] S2. Cool the reaction solution to room temperature, add 0.12 mol EDC and 0.12 mol NHS, stir and activate at room temperature for 1 h, then add 0.11 mol aminothiourea, react at 50 °C for 4 h. After the reaction is complete, precipitate, filter, wash and vacuum dry to obtain the composite rust inhibitor.

[0055] Example 3

[0056] A method for preparing a rust-preventive liquid for metal surfaces includes the following steps:

[0057] (1) Mix 12 parts base oil, 5 parts composite rust inhibitor, 4 parts benzotriazole, 1 part antioxidant 168, 2 parts antistatic agent ASA-3 and 0.8 parts emulsified silicone oil evenly to obtain mixed solution A;

[0058] (2) Add 1.5 parts of hydroxyethyl cellulose, 2 parts of sodium metabisulfite and 3 parts of inositol hexaphosphate to 50 parts of deionized water and stir evenly at 60°C to obtain mixed solution B;

[0059] (3) Mix solution A and solution B, then add 3 parts sodium dodecylbenzenesulfonate and 3 parts alkylphenol polyoxyethylene ether NP-10, stir evenly, and emulsify with a high shear emulsifier to obtain a metal surface rust inhibitor.

[0060] The preparation method of the composite rust inhibitor is as follows:

[0061] S1. Dissolve 0.1 mol N-vinylimidazolium and 0.1 mol dodecenylsuccinic acid in 150 mL of organic solvent DMF, then add 0.001 mol of initiator azobisisobutyronitrile, heat and stir at 70 °C for 6 h to obtain the reaction solution;

[0062] S2. Cool the reaction solution to room temperature, add 0.12 mol EDC and 0.12 mol NHS, stir and activate at room temperature for 1 h, then add 0.12 mol aminothiourea, react at 50 °C for 4 h. After the reaction is complete, precipitate, filter, wash and vacuum dry to obtain the composite rust inhibitor.

[0063] Comparative Example 1

[0064] A method for preparing a rust-preventive liquid for metal surfaces includes the following steps:

[0065] (1) Mix 10 parts base oil, 3 parts composite rust inhibitor, 2 parts benzotriazole, 1 part antioxidant 168, 1 part antistatic agent ASA-3 and 0.5 parts emulsified silicone oil evenly to obtain mixed solution A;

[0066] (2) Add 1 part hydroxyethyl cellulose, 1 part sodium metabisulfite and 2 parts inositol hexaphosphate to 40 parts deionized water and stir evenly at 60°C to obtain mixed solution B;

[0067] (3) Mix solution A and solution B, then add 3 parts sodium dodecylbenzenesulfonate and 2 parts alkylphenol polyoxyethylene ether NP-10, stir evenly, and emulsify with a high shear emulsifier to obtain a metal surface rust inhibitor.

[0068] The preparation method of the composite rust inhibitor is as follows:

[0069] 0.1 mol N-vinylimidazolium and 0.1 mol dodecenylsuccinic acid were dissolved in 150 mL of organic solvent DMF, and then 0.001 mol of initiator azobisisobutyronitrile was added. The mixture was heated and stirred at 70 °C for 6 h. The reaction solution was then precipitated, filtered, washed, and vacuum dried to obtain the composite rust inhibitor.

[0070] Compared with Comparative Example 1 and Example 1, the composite rust inhibitor did not contain grafted aminothiourea.

[0071] Comparative Example 2

[0072] A method for preparing a rust-preventive liquid for metal surfaces includes the following steps:

[0073] (1) Mix 10 parts base oil, 3 parts composite rust inhibitor, 2 parts benzotriazole, 1 part antioxidant 168, 1 part antistatic agent ASA-3 and 0.5 parts emulsified silicone oil evenly to obtain mixed solution A;

[0074] (2) Add 1 part hydroxyethyl cellulose, 1 part sodium metabisulfite and 2 parts inositol hexaphosphate to 40 parts deionized water and stir evenly at 60°C to obtain mixed solution B;

[0075] (3) Mix solution A and solution B, then add 3 parts sodium dodecylbenzenesulfonate and 2 parts alkylphenol polyoxyethylene ether NP-10, stir evenly, and emulsify with a high shear emulsifier to obtain a metal surface rust inhibitor.

[0076] The preparation method of the composite rust inhibitor is as follows:

[0077] S1. Dissolve 0.1 mol of dodecenylsuccinic acid in 150 mL of organic solvent DMF, then add 0.001 mol of initiator azobisisobutyronitrile, heat and stir at 70 °C for 6 h to obtain the reaction solution;

[0078] S2. Cool the reaction solution to room temperature, add 0.12 mol EDC and 0.12 mol NHS, stir and activate at room temperature for 1 h, then add 0.11 mol aminothiourea, react at 50 °C for 4 h. After the reaction is complete, precipitate, filter, wash and vacuum dry to obtain the composite rust inhibitor.

[0079] Compared with Comparative Example 2 and Example 1, no N-vinylimidazole was introduced into the composite rust inhibitor.

[0080] Comparative Example 3

[0081] A method for preparing a rust-preventive liquid for metal surfaces includes the following steps:

[0082] (1) Mix 10 parts base oil, 1 part dodecenyl succinic acid, 2 parts benzotriazole, 1 part antioxidant 168, 1 part antistatic agent ASA-3 and 0.5 parts emulsified silicone oil evenly to obtain mixed solution A;

[0083] (2) Add 1 part hydroxyethyl cellulose, 1 part N-vinylimidazolium, 1 part aminothiourea, 1 part sodium metabisulfite and 2 parts inositol hexaphosphate to 40 parts deionized water and stir evenly at 60°C to obtain mixed solution B.

[0084] (3) Mix solution A and solution B, then add 3 parts sodium dodecylbenzenesulfonate and 2 parts alkylphenol polyoxyethylene ether NP-10, stir evenly, and emulsify with a high shear emulsifier to obtain a metal surface rust inhibitor.

[0085] Compared to Example 1, Comparative Example 3 involved the physical blending of N-vinylimidazolium, dodecenylsuccinic acid, and aminothiourea.

[0086] The degreased and derusted Q235 steel was immersed in the rust-inhibiting solutions prepared in Examples 1-3 and Comparative Examples 1-3, respectively. After 5 minutes, it was removed and dried at 60°C, thus coating the surface of the steel with an anti-corrosion film. Performance tests were then conducted, as follows:

[0087] Salt water resistance test: According to GB / T 10834-2008 standard, a 5% NaCl solution was used for testing. During the test, the temperature was maintained at 25℃, and 3 / 4 of the suspended steel was immersed in the NaCl solution. The time it took for the steel surface to rust was observed and recorded.

[0088] Neutral salt spray resistance test: In accordance with GB / T 1771-2007 standard, in a test chamber at 35℃ and 95% humidity, a 5% NaCl spray solution with a pH value of 7.2 is sprayed through a spraying device. The steel surface is taken out and the rusting condition is observed and recorded every 12 hours. ">120" means no rusting for more than 120 hours, ">96" means no rusting for more than 96 hours, but rusting on the steel surface after 108 hours, and so on.

[0089] The test results are shown in Table 1.

[0090] Table 1 Test Results for Different Groups

[0091]

[0092] As can be seen from Table 1, compared with Comparative Examples 1-3, the composite rust inhibitor provided by the present invention has excellent anti-corrosion performance.

[0093] Finally, it should be noted that the above embodiments do not limit the present invention in any way. Those skilled in the art can make modifications and improvements based on the present invention. Therefore, any modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A rust-preventive liquid for metal surfaces, characterized in that, The raw materials, by weight, include the following components: 10-15 parts base oil, 3-6 parts composite rust inhibitor, 0.5-1 part emulsified silicone oil, 1-2 parts hydroxyethyl cellulose, 1-2 parts sodium metabisulfite, 2-5 parts benzotriazole, 1-2 parts antioxidant, 1-2 parts antistatic agent, 2-4 parts inositol hexaphosphate, 3-6 parts sodium dodecylbenzenesulfonate, 2-5 parts alkylphenol polyoxyethylene ether, and 40-60 parts deionized water; The preparation method of the composite rust inhibitor is as follows: S1. Dissolve N-vinylimidazolium and dodecenylsuccinic acid in an organic solvent, then add an initiator, heat and stir to react, and obtain a reaction solution; S2. Cool the reaction solution to room temperature, add EDC and NHS, stir to activate, then add aminothiourea and continue the reaction. After the reaction is completed, precipitate, filter, wash and vacuum dry to obtain the composite rust inhibitor. The molar ratio of N-vinylimidazolium, dodecenylsuccinic acid, initiator, EDC, NHS and aminothiourea is 1:1-1.2:0.005-0.01:1.2-1.5:1.2-1.5:1.1-1.

3.

2. The metal surface rust inhibitor according to claim 1, characterized in that, The base oil is selected from one or more of the following: machine oil, vegetable oil, silicone oil, and kerosene.

3. The metal surface rust inhibitor according to claim 1, characterized in that, In step S1, the temperature for heating and stirring the reaction is 60-70℃, and the reaction time is 6-12h.

4. The metal surface rust inhibitor according to claim 1, characterized in that, In step S2, the reaction temperature is 30-50℃ and the reaction time is 4-8h.

5. The metal surface rust inhibitor according to claim 1, characterized in that, The antioxidant is selected from antioxidant 1010 or antioxidant 168.

6. The metal surface rust inhibitor according to claim 1, characterized in that, The antistatic agent is selected from antistatic agent ASA-3.

7. The method for preparing the metal surface rust inhibitor as described in any one of claims 1-6, characterized in that, Includes the following steps: (1) Mix the base oil, composite rust inhibitor, benzotriazole, antioxidant, antistatic agent and emulsified silicone oil evenly to obtain mixed solution A; (2) Add hydroxyethyl cellulose, sodium metabisulfite and inositol hexaphosphate to deionized water, heat and stir until homogeneous to obtain mixed solution B; (3) Mix solution A and solution B, then add sodium dodecylbenzenesulfonate and alkylphenol polyoxyethylene ether, stir evenly to obtain metal surface rust prevention liquid.

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