High-temperature-resistant antirust oil and preparation method thereof

Abstract

The invention belongs to the technical field of anti-rust oil, and particularly provides high-temperature-resistant anti-rust oil and a preparation method thereof.The anti-rust oil is prepared from, by weight, 65-85 parts of base oil, 6-11 parts of anti-rust agent, 4-6 parts of petroleum sodium sulfonate, 2-3.5 parts of modified montmorillonite, 1-3 parts of film-forming agent, 1-3 parts of oil solvent and 1-2 parts of antioxidant. The anti-rust oil provided by the invention has good high temperature resistance and excellent anti-rust and anti-corrosion performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of rust preventive oils, and particularly relates to a high-temperature resistant rust preventive oil and a preparation method thereof. Background Art

[0002] With the continuous development of industrial technology, the application of metal materials in high-temperature environments is becoming more and more extensive, especially in the fields of automobiles, aerospace, chemical machinery, etc. Metal materials are prone to oxidation and corrosion under high-temperature conditions, resulting in a decline in performance and a shortening of service life.

[0003] At present, traditional rust preventive oils on the market can effectively prevent metal corrosion at room temperature, but under high-temperature conditions, their rust prevention performance often significantly decreases. Many existing rust preventive oils may decompose or oxidize at high temperatures, forming precipitates, and even causing discoloration on the metal surface.

[0004] Chinese Patent CN 109233936 B relates to a high-temperature resistant polyester lubricating oil base oil and a preparation method thereof. The base oil is prepared from 1,3,5-cyclohexanetricarbinol, diethyl fluoromalonate, 12-benzoyl stearic acid, 2,2-difluoropropionic acid, 3-fluoro-4-hydroxybenzoic acid, perfluoroheptanoic acid, and tris(trimethylsilyl) phosphate as main raw materials. Although the use of fluorinated compounds in this raw material ensures the high-temperature resistance and anti-carbon deposition performance of the product and can be applied to the lubrication of most vehicle engines, especially suitable for high-temperature environments, however, this invention contains an excessive amount of fluorine compounds and does not meet environmental protection requirements.

[0005] Therefore, in the case of ensuring low toxicity and low pollution, there is an urgent need for a rust preventive oil with good high-temperature resistance and excellent rust prevention effect. Summary of the Invention

[0006] Aiming at the existing technical problems, the purpose of the present invention is to provide a high-temperature resistant rust preventive oil and a preparation method thereof. The rust preventive oil provided by the present invention has good high-temperature resistance and excellent rust prevention and anti-corrosion performance.

[0007] In order to achieve the above purpose, the technical scheme adopted by the present invention is as follows:

[0008] On the one hand, the present invention provides a high-temperature resistant rust preventive oil. By weight, the rust preventive oil comprises the following raw materials: 65-85 parts of base oil, 6-11 parts of rust inhibitor, 4-6 parts of petroleum sulfonate, 2-3.5 parts of modified montmorillonite, 1-3 parts of film-forming agent, 1-3 parts of oil solvent, and 1-2 parts of antioxidant.

[0009] The reaction mechanism and function of the present invention are as follows:

[0010] 1. Dodecenyl succinic acid has a certain rust prevention property and good oil solubility. However, when used alone, the density of the rust prevention film layer formed by dodecenyl succinic acid is not high, which will lead to a decrease in corrosion resistance and is not conducive to long-term rust prevention.

[0011] On the one hand, the present invention introduces 1,4-butanediol diglycidyl ether, which can increase the fluidity and permeability of the rust inhibitor, contribute to the uniform distribution of the rust inhibitor on the metal surface, and its good flexibility and low volatility contribute to the formation of a uniform and dense protective film. On the other hand, the addition of amino polyethylene glycol is beneficial to form stable coordination bonds with the metal surface and enhance the adhesion of the rust inhibitor; at the same time, the grafted long-chain ether groups will form a hydrophobic protective film on the metal surface, preventing the corrosive medium water from directly contacting the metal and also blocking the movement of relevant charges or substances participating in the corrosion reaction, thereby improving the rust prevention performance; in addition, the lubricating performance of amino polyethylene glycol can also reduce the friction and wear between metal parts and extend the service life of mechanical equipment. Further, the introduction of 2,5-difluoro-4-methoxybenzaldehyde can prevent oxidation reactions during the reaction process, thereby improving the heat resistance, moisture resistance and oxidation resistance of the rust inhibitor, so that it can still maintain a stable rust prevention effect at high temperatures and in corrosive media.

[0012] 2. Montmorillonite itself has good thermal stability. However, due to the strong hydrophilicity of the montmorillonite surface, it is not conducive to its dispersion in the organic phase and wetting by the organic phase. Therefore, it usually needs to be organically modified to have good dispersion in the organic phase.

[0013] The present invention introduces an amino silane coupling agent, which can react with the hydroxyl groups on the montmorillonite surface and thus graft onto the montmorillonite surface, reducing the hydrophilicity of the montmorillonite and effectively improving the interfacial compatibility between the montmorillonite and the matrix. Then, the applicant binds tetraphenylphosphonium chloride to sodium montmorillonite by ion exchange, making the montmorillonite surface change from hydrophilic to lipophilic and improving the compatibility between the montmorillonite and the matrix; at the same time, the introduction of quaternary phosphonium salt helps to increase the thermal decomposition temperature, and then makes the montmorillonite have better thermal stability and flame retardancy. In addition, the introduction of sodium p-aminobenzenesulfonate can further improve the corrosion resistance.

[0014] 3. The present invention selects a composition of poly-α-olefin and phosphate ester as the base oil, and adds a composition of tris(trimethylsilanol) phosphate and butyloctyldiphenylamine with good thermal stability as the antioxidant, further improving the overall performance of the rust preventive oil.

[0015] In some embodiments, the base oil is a composition of poly-α-olefin and phosphate ester.

[0016] Preferably, the mass ratio of the poly-α-olefin to the phosphate ester is 1:(0.8 - 1).

[0017] In some embodiments, the preparation method of the rust inhibitor comprises the following steps:

[0018] Q1. Mix dodecenyl succinic acid and 1,4-butanediol diglycidyl ether, stir, heat to 120 - 150 °C and react for 3 - 4 h, then raise the temperature to 190 - 220 °C, keep the temperature for reaction for 4 - 6 h, and cool to obtain a reaction intermediate;

[0019] Q2. Mix the reaction intermediate obtained in step Q1, amino polyethylene glycol, and sulfuric acid, heat to 140 - 160 °C and react for 3 - 5 h, add 2,5-difluoro-4-methoxybenzaldehyde, keep the temperature for reaction for 3 - 4 h, cool, and neutralize with an aqueous solution of Na 2 CO 3 with a mass fraction of 10 - 15%, and carry out vacuum distillation to obtain the rust inhibitor.

[0020] In some embodiments, the molar ratio of dodecenyl succinic acid to 1,4-butanediol diglycidyl ether in step Q1 is (2.05 - 2.25):1.

[0021] In some embodiments, the mass ratio of the reaction intermediate, amino polyethylene glycol, and 2,5-difluoro-4-methoxybenzaldehyde in step Q2 is 1:(1.8 - 2.7):(0.5 - 0.9).

[0022] In some embodiments, the preparation method of the modified montmorillonite comprises the following steps:

[0023] T1. Mix sodium montmorillonite and absolute ethanol, stir, add an amino silane coupling agent, heat to 65 - 75 °C, react for 1 - 2 h, centrifuge, wash, and dry to obtain a solid;

[0024] T2. Mix tetraphenylphosphonium chloride, sodium p-aminobenzenesulfonate, and deionized water, add the solid obtained in step T1, grind for 2 - 3 h, filter, wash, and dry to obtain the modified montmorillonite.

[0025] In some embodiments, the mass ratio of sodium montmorillonite to the amino silane coupling agent in step T1 is 1:(0.2 - 0.5).

[0026] In some embodiments, the mass ratio of tetraphenylphosphonium chloride, sodium p-aminobenzenesulfonate, and the solid in step T2 is (2.1 - 3):(0.5 - 0.8):1.

[0027] In some embodiments, the film-forming agent is selected from any one or more of paraffin, lanolin, petrolatum, and petroleum resin.

[0028] Preferably, the film-forming agent is a composition of paraffin and petroleum resin.

[0029] Further preferably, the mass ratio of the paraffin wax to the petroleum resin is 1:1.

[0030] In some embodiments, the antioxidant is a composition of tris(trimethylsilyl) phosphate and butyloctyldiphenylamine.

[0031] Preferably, the mass ratio of tris(trimethylsilyl) phosphate to butyloctyldiphenylamine is 1:(1 - 2).

[0032] In some embodiments, the oil solvent is selected from any one or more of Span 80, palmitic acid, stearic acid, and ricinoleic acid.

[0033] On the other hand, the present invention provides a preparation method of a high-temperature resistant rust preventive oil, comprising the following steps:

[0034] Add the base oil into a reaction kettle, heat it to 50 - 60 °C, stir for 20 - 30 min, add the modified montmorillonite, stir for 30 - 40 min, then successively add the oil solvent, the rust preventive agent, and sodium petroleum sulfonate, raise the temperature to 80 - 90 °C, stir for 2 - 4 h, lower the temperature to 50 - 60 °C, successively add the antioxidant and the film-forming agent, stir for 1 - 2 h, and then cool to obtain the rust preventive oil.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] 1. The rust preventive oil provided by the present invention has good high-temperature resistance and excellent rust prevention and corrosion protection performance.

[0037] 2. The present invention uses 1,4-butanediol diglycidyl ether, amino polyethylene glycol, and 2,5-difluoro-4-methoxybenzaldehyde to jointly modify dodecenyl succinic acid to generate a novel rust preventive agent. Through the synergistic effect among the components, a uniform and dense protective film is formed on the metal surface, thereby improving the rust prevention performance, adhesion, heat resistance, moisture resistance, and antioxidant property of the rust preventive agent.

[0038] 3. The modified montmorillonite of the present invention effectively improves the high-temperature resistance. On the one hand, an amino silane coupling agent is introduced to reduce the hydrophilicity of montmorillonite, effectively improving the interfacial compatibility between montmorillonite and the matrix; on the other hand, tetraphenylphosphonium chloride is combined with sodium montmorillonite to further improve the dispersion compatibility, thermal stability, and flame retardancy of montmorillonite; in addition, the introduction of sodium p-aminobenzenesulfonate can further enhance the corrosion protection property. Specific Embodiments

[0039] The following will illustrate the present invention in conjunction with specific implementation schemes. It should be noted that the following examples are examples of the present invention, only used to illustrate the present invention, rather than to limit the present invention. Without departing from the gist or scope of the present invention, other combinations and various improvements within the concept of the present invention can be made.

[0040] Prepare each rust preventive oil according to the ratio of each raw material and the preparation method specified in the following examples and comparative examples.

[0041] To facilitate those skilled in the art to implement the present invention, the manufacturers of some raw materials in the examples and comparative examples are described as follows:

[0042] Amino polyethylene glycol: purchased from Chongqing Yusai Medical Technology Co., Ltd., product number YS-P3120;

[0043] Petroleum resin: purchased from Puyang Ruike Chemical Industry Co., Ltd., product number 6540865;

[0044] Polyalphaolefin: purchased from Shenzhen Longdi Chemical Industry Co., Ltd., PAO6;

[0045] For other raw materials without special instructions, they can all be purchased from the market.

[0046] Preparation Example 1

[0047] The preparation method of rust preventive A includes the following steps:

[0048] Q1. Mix 0.43 mol of dodecenyl succinic acid and 0.2 mol of 1,4-butanediol diglycidyl ether, stir for 1 h, heat to 135 °C and react for 3.5 h, then raise the temperature to 205 °C, keep the temperature for reaction for 5 h, and cool to room temperature to obtain a reaction intermediate;

[0049] Q2. Mix 20 g of the reaction intermediate obtained in step Q1, 45 g of amino polyethylene glycol, and 15 g of concentrated sulfuric acid with a mass fraction of 98%, heat to 150 °C and react for 4 h, add 14 g of 2,5-difluoro-4-methoxybenzaldehyde, keep the temperature for reaction for 3.5 h, cool to room temperature, and neutralize with an aqueous solution of Na 2 CO 3 with a mass fraction of 10% to pH 7, and perform vacuum distillation to obtain rust preventive A.

[0050] Preparation Example 2

[0051] The preparation method of rust preventive B is the same as that of Preparation Example 1, except that the addition amount of dodecenyl succinic acid in step Q1 is 0.37 mol.

[0052] Preparation Example 3

[0053] The preparation method of rust preventive C is the same as that of Preparation Example 1, except that the addition amount of amino polyethylene glycol in step Q2 is 32 g.

[0054] Preparation Example 4

[0055] The preparation method of rust inhibitor D is the same as that of Preparation Example 1, except that the addition amount of 2,5-difluoro-4-methoxybenzaldehyde in step Q2 is 7 g.

[0056] Preparation Example 5

[0057] The preparation method of modified montmorillonite A comprises the following steps:

[0058] T1. Mix 100 g of sodium-based montmorillonite and 1 L of absolute ethanol, stir for 1 h, add 35 g of N-β(aminoethyl)-γ-aminopropyltrimethoxysilane, heat to 70 °C, react for 1.5 h, centrifuge, wash with absolute ethanol 3 times, and dry at 95 °C to constant weight to obtain a solid;

[0059] T2. Mix 156 g of tetraphenylphosphonium chloride, 39 g of sodium p-aminobenzenesulfonate, and 1200 mL of deionized water, add 60 g of the solid obtained in step T1, grind for 2.5 h, filter, wash with deionized water 5 times, and dry at 95 °C to constant weight to obtain modified montmorillonite A.

[0060] Preparation Example 6

[0061] The preparation method of modified montmorillonite B is the same as that of Preparation Example 5, except that the addition amount of N-β(aminoethyl)-γ-aminopropyltrimethoxysilane is 18 g.

[0062] Preparation Example 7

[0063] The preparation method of modified montmorillonite C is the same as that of Preparation Example 5, except that the addition amount of tetraphenylphosphonium chloride is 111 g.

[0064] Preparation Example 8

[0065] The preparation method of modified montmorillonite D is the same as that of Preparation Example 5, except that the addition amount of sodium p-aminobenzenesulfonate is 24 g.

[0066] Example 1

[0067] A high-temperature resistant rust preventive oil, by weight, the rust preventive oil comprises the following raw materials: 75 parts of base oil, 8.5 parts of rust inhibitor A, 5 parts of petroleum sulfonate, 2.75 parts of modified montmorillonite A, 2 parts of film-forming agent, 2 parts of Span 80, 1.5 parts of antioxidant; wherein,

[0068] The base oil is a composition of polyalphaolefin and phosphate ester, and the mass ratio is 1:0.9;

[0069] The film-forming agent is a composition of paraffin and petroleum resin, and the mass ratio is 1:1;

[0070] The antioxidant is a composition of tris(trimethylsilyl) phosphate and butyloctyldiphenylamine, and the mass ratio is 1:1.5;

[0071] The preparation method of the rust preventive oil in this embodiment comprises the following steps:

[0072] Add the base oil into a reaction kettle, heat it to 55 °C, stir for 25 min, add modified montmorillonite A, stir for 35 min, then successively add Span 80, rust preventive agent A, and sodium petroleum sulfonate, raise the temperature to 85 °C, stir for 3 h, cool down to 55 °C, successively add antioxidant and film-forming agent, stir for 1.5 h, and cool to room temperature to obtain the rust preventive oil.

[0073] Example 2

[0074] A high-temperature resistant rust preventive oil, by weight, the rust preventive oil comprises the following raw materials: 65 parts of base oil, 6 parts of rust preventive agent A, 4 parts of sodium petroleum sulfonate, 2 parts of modified montmorillonite A, 1 part of film-forming agent, 1 part of Span 80, 1 part of antioxidant; wherein,

[0075] The base oil is a composition of poly-α-olefin and phosphate ester, and the mass ratio is 1:0.8;

[0076] The film-forming agent is a composition of paraffin and petroleum resin, and the mass ratio is 1:1;

[0077] The antioxidant is a composition of tris(trimethylsilyl) phosphate and butyloctyldiphenylamine, and the mass ratio is 1:1;

[0078] The preparation method of the rust preventive oil in this embodiment comprises the following steps:

[0079] Add the base oil into a reaction kettle, heat it to 60 °C, stir for 20 min, add modified montmorillonite A, stir for 30 min, then successively add Span 80, rust preventive agent A, and sodium petroleum sulfonate, raise the temperature to 90 °C, stir for 2 h, cool down to 60 °C, successively add antioxidant and film-forming agent, stir for 1 h, and cool to room temperature to obtain the rust preventive oil.

[0080] Example 3

[0081] A high-temperature resistant rust preventive oil, by weight, the rust preventive oil comprises the following raw materials: 85 parts of base oil, 11 parts of rust preventive agent A, 6 parts of sodium petroleum sulfonate, 3.5 parts of modified montmorillonite A, 3 parts of film-forming agent, 3 parts of Span 80, 2 parts of antioxidant; wherein,

[0082] The base oil is a composition of poly-α-olefin and phosphate ester, and the mass ratio is 1:1;

[0083] The film-forming agent is a composition of paraffin and petroleum resin, and the mass ratio is 1:1;

[0084] The antioxidant is a composition of tris(trimethylsilyl) phosphate and butyloctyldiphenylamine, and the mass ratio is 1:2;

[0085] The preparation method of the rust preventive oil in this embodiment comprises the following steps:

[0086] Add the base oil into a reaction kettle, heat it to 50 °C, stir for 30 min, add modified montmorillonite A, stir for 40 min, then successively add Span 80, rust preventive agent A, and sodium petroleum sulfonate, raise the temperature to 80 °C, stir for 4 h, lower the temperature to 50 °C, successively add antioxidant and film-forming agent, stir for 2 h, and cool to room temperature to obtain the rust preventive oil.

[0087] Example 4

[0088] A high-temperature resistant rust preventive oil and its preparation method, the specific implementation manner is the same as that of Example 1, the difference is that rust preventive agent A is replaced with an equal amount of rust preventive agent B.

[0089] Example 5

[0090] A high-temperature resistant rust preventive oil and its preparation method, the specific implementation manner is the same as that of Example 1, the difference is that rust preventive agent A is replaced with an equal amount of rust preventive agent C.

[0091] Example 6

[0092] A high-temperature resistant rust preventive oil and its preparation method, the specific implementation manner is the same as that of Example 1, the difference is that rust preventive agent A is replaced with an equal amount of rust preventive agent D.

[0093] Example 7

[0094] A high-temperature resistant rust preventive oil and its preparation method, the specific implementation manner is the same as that of Example 1, the difference is that modified montmorillonite A is replaced with an equal amount of modified montmorillonite B.

[0095] Example 8

[0096] A high-temperature resistant rust preventive oil and its preparation method, the specific implementation manner is the same as that of Example 1, the difference is that modified montmorillonite A is replaced with an equal amount of modified montmorillonite C.

[0097] Example 9

[0098] A high-temperature resistant rust preventive oil and its preparation method, the specific implementation manner is the same as that of Example 1, the difference is that modified montmorillonite A is replaced with an equal amount of modified montmorillonite D.

[0099] Example 10

[0100] A high-temperature resistant rust preventive oil and its preparation method, the specific implementation manner is the same as that of Example 1, the difference is that rust preventive agent A is replaced with an equal amount of commercially available dodecenyl succinic acid.

[0101] Example 11

[0102] A high-temperature resistant rust preventive oil and its preparation method. The specific implementation manner is the same as that of Example 1, except that the base oil is only poly-α-olefin.

[0103] Comparative Example 1

[0104] A high-temperature resistant rust preventive oil and its preparation method. The specific implementation manner is the same as that of Example 1, except that commercially available sodium-based montmorillonite is used to replace modified montmorillonite A in equal amounts.

[0105] Effect evaluation:

[0106] The rust preventive oils prepared in the above Examples 1-11 and Comparative Example 1 were tested and analyzed. The specific results are shown in Table 1.

[0107] Performance test:

[0108] (1) High-temperature resistance test: It was tested according to SH / T0300-1992 "Crankcase Simulation Test Method (QZX Method)". The rating of high-temperature resistance is divided into levels 1-10. The smaller the value, the better the high-temperature resistance;

[0109] (2) Salt spray test: According to the standard SH / T 0081-1991 "Salt Spray Test Method for Rust Preventive Oils and Greases", the test conditions are: temperature 50°C, test solution: 5wt% NaCl aqueous solution.

[0110] Table 1

[0111] Serial number High temperature resistance test (rating at 320°C) Salt spray test (50°C, Grade A) / h Example 1 Grade 1 730 Example 2 Grade 1 715 Example 3 Grade 1 725 Example 4 Grade 1 650 Example 5 Grade 1 600 Example 6 Grade 2 620 Example 7 Grade 2 715 Example 8 Grade 2 720 Example 9 Grade 2 710 Example 10 Grade 1 580 Example 11 Grade 3 720 Comparative Example 1 Grade 3 700

[0112] From the results in Table 1, it can be seen that the rust preventive oils of Examples 1-3 have good high-temperature resistance and good rust prevention and corrosion protection effects.

[0113] Compared with Example 1, in the preparation of the rust remover, for Examples 4-6 and Comparative Example 1, in Example 4, the molar ratio of dodecenyl succinic acid and 1,4-butanediol diglycidyl ether was changed, resulting in a decrease in the compactness of the formed protective film. In Examples 5-6, the mass ratio of the reaction intermediate, amino polyethylene glycol and 2,5-difluoro-4-methoxybenzaldehyde was changed, respectively resulting in a decrease in the adhesion and heat resistance of the rust preventive agent, and thus both would lead to a decrease in the rust prevention and corrosion protection performance of the rust preventive oil; in Example 10, commercially available dodecenyl succinic acid was used as the rust remover in equal amounts, and the density of the rust preventive film layer was not high, further resulting in poor rust prevention and corrosion protection effects of the rust preventive oil.

[0114] Examples 7-9 and Comparative Example 1 compared with Example 1. When preparing the modified montmorillonite, in Example 7, the mass ratio of sodium-based montmorillonite and amino-silane coupling agent was changed, weakening the interfacial compatibility between the montmorillonite and the matrix, and thus decreasing the high-temperature resistance of the rust preventive oil; in Examples 8-9, the mass ratios of tetraphenylphosphonium chloride, sodium p-aminobenzenesulfonate and the solid were changed. In Example 8, the lipophilicity of the montmorillonite was weakened, and in Example 9, the corrosion resistance and thermal stability decreased, which would all affect the high-temperature resistance of the rust preventive oil to a certain extent; in Comparative Example 1, an equal amount of commercially available sodium-based montmorillonite was used, and it was difficult for the montmorillonite to be evenly dispersed, weakening the high-temperature resistance of the rust preventive oil and having little effect on the rust prevention and corrosion protection effects.

[0115] Example 11 compared with Example 1. Only poly-α-olefin was selected as the base oil, which significantly decreased the high-temperature resistance of the rust preventive oil, but had little effect on the rust prevention and corrosion protection effects.

[0116] As mentioned above, it is only the preferred embodiments of the present invention, and does not impose any form of limitation on this application. Although this application is disclosed by the preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art, without departing from the scope of the technical solution of this application, making some changes or modifications using the disclosed technical content above is equivalent to the equivalent implementation cases. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution.

Claims

1. A high temperature resistant anti-rust oil, characterized in that: The anti-rust oil comprises the following raw materials by weight: 65-85 parts of base oil, 6-11 parts of rust inhibitor, 4-6 parts of sodium petroleum sulfonate, 2-3.5 parts of modified montmorillonite, 1-3 parts of film former, 1-3 parts of oil solvent and 1-2 parts of antioxidant.

2. A high temperature resistant anti-rust oil according to claim 1, characterized in that: The base oil is a composition of poly-alpha-olefin and phosphate ester.

3. A high temperature resistant anti-rust oil according to claim 1, characterized in that: The preparation method of the rust inhibitor comprises the following steps: Q1. Mix dodecenylsuccinic acid and 1,4-butanediol diglycidyl ether, stir, heat to 120-150°C for reaction for 3-4h, then heat to 190-220°C, keep warm for reaction for 4-6h, and cool to obtain a reaction intermediate; Q2. Mix the reaction intermediate obtained in step Q1, aminopolyethylene glycol and sulfuric acid, heat to 140-160°C for reaction for 3-5h, add 2,5-difluoro-4-methoxybenzaldehyde, keep warm for reaction for 3-4h, cool, neutralize with 10-15% mass fraction Na2CO3 aqueous solution, and distill under reduced pressure to obtain a rust inhibitor.

4. A high temperature resistant anti-rust oil according to claim 3, characterized in that: The molar ratio of dodecenylsuccinic acid to 1,4-butanediol diglycidyl ether in step Q1 is (2.05-2.25):

1.

5. A high temperature resistant anti-rust oil according to claim 4, characterized in that: The mass ratio of the reaction intermediate, aminopolyethylene glycol and 2,5-difluoro-4-methoxybenzaldehyde in step Q2 is 1:(1.8-2.7):(0.5-0.9).

6. The high temperature resistant antirust oil according to claim 1, characterized in that: The preparation method of the modified montmorillonite comprises the following steps: T1. Mix sodium montmorillonite and anhydrous ethanol, stir, add aminosilane coupling agent, heat to 65-75°C, react for 1-2h, centrifuge, wash, and dry to obtain a solid; T2. Mix tetraphenylphosphine chloride, sodium p-aminobenzenesulfonate and deionized water, add the solid obtained in step T1, grind for 2-3 hours, filter, wash and dry to obtain modified montmorillonite.

7. A high temperature resistant anti-rust oil according to claim 6, characterized in that: The mass ratio of sodium montmorillonite to aminosilane coupling agent in step T1 is 1:(0.2-0.5).

8. The high temperature resistant anti-rust oil according to claim 6, characterized in that: The mass ratio of tetraphenylphosphine chloride, sodium p-aminobenzenesulfonate and solid in step T2 is (2.1-3):(0.5-0.8):

1.

9. The high temperature resistant antirust oil according to claim 1, characterized in that: The film-forming agent is selected from any one or more of paraffin, lanolin, vaseline and petroleum resin.

10. A method for preparing the high temperature resistant rust preventive oil according to any one of claims 1 to 9, characterized in that: The following steps are included: Add the base oil into the reactor, heat to 50-60℃, stir for 20-30min, add modified montmorillonite, stir for 30-40min, then add oil solvent, rust inhibitor, sodium petroleum sulfonate in turn, heat to 80-90℃, stir for 2-4h, cool to 50-60℃, add antioxidant and film-forming agent in turn, stir for 1-2h, cool to obtain rust-proof oil.