Rust remover with three-in-one effects of rust removal, coating and rust prevention and preparation method of rust remover

Abstract

The invention provides a rust remover with three-in-one effects of rust removal, film and rust prevention and a preparation method thereof.The rust remover comprises an agent A and an agent B. The agent A is prepared from, by weight, 5-10 parts of a modified amino silane coupling agent, 15-30 parts of organic acid, 5-15 parts of modified diatomite and 150-300 parts of water; and the agent B comprises the following raw materials: 5-10 parts of a corrosion inhibitor and 100-150 parts of water. The rust remover disclosed by the invention is uniform in film formation, good in rust removal and rust prevention effects, environment-friendly and pollution-free, and has a relatively good application value.

Description

Technical Field

[0001] The invention belongs to the field of rust inhibitors, and in particular relates to a rust inhibitor with three-in-one functions of rust removal, film formation and rust prevention, and a preparation method thereof. Background Art

[0002] As the cornerstone of my country's economic construction, steel plays an indispensable role in many key areas. However, steel is prone to rust during use, which not only affects the performance and service life of steel materials, but also causes huge economic losses. In order to improve the corrosion resistance and reliability of steel materials, rust removal on the steel surface has become a crucial process step. The purpose is to remove the oxide layer and rust spots on the steel surface, restore the clean state of the substrate, and lay a good foundation for subsequent rust prevention and coating processes.

[0003] At present, steel rust removal technology is mainly divided into two categories: physical methods and chemical methods. Physical rust removal methods mainly remove rust manually, using hand tools such as wire brushes, sandpaper, electric or pneumatic tools, etc. However, it is only suitable for the treatment of small areas or local rust, and the labor cost is high. Traditional chemical rust removal mostly relies on a strong acidic environment. For example, hydrochloric acid is widely used due to its low cost, high efficiency and small over-corrosion effect; however, hydrochloric acid is highly volatile and may pose a threat to the health of operators. At the same time, the cost of wastewater treatment after its use is relatively high. In addition, nitric acid, as a strong oxidizing acid, although it is also used as the main component of the pickling agent, may produce irritating yellow smoke during its use, which poses a great hazard to the health of workers and the environment.

[0004] Faced with the strict requirements of environmental regulations and the public's high attention to health, traditional hydrochloric acid and nitric acid cleaning agents are gradually being eliminated. The industry has begun to turn to sulfuric acid, phosphoric acid and other alternative cleaning agents. Although sulfuric acid is a low-cost cleaning agent, its rust removal ability is relatively weak, so it is rarely used in practical applications. Although phosphoric acid can form a phosphating film during the pickling process to provide short-term rust protection for steel, the use of phosphoric acid or phosphates is strictly restricted due to its environmental risks, resulting in a significant increase in the wastewater treatment costs of related companies. At present, organic acids are beginning to be used for rust removal on the market to achieve better results and meet environmental protection requirements.

[0005] Chinese patent CN 109208015 A discloses a method for preparing a composite rust remover for metal surface, wherein liquid A comprises trifluoroethanol and hydroxyethylene diphosphoric acid; liquid B comprises water, dodecyl hydroxypropyl phosphate betaine, triethylenetetramine hexaacetic acid, 1-decyl-3-methylimidazole hexafluorophosphate and hydroquinone; liquid C comprises water, triisopropanolamine and polyoxypropylene polyoxyethylene glycerol ether; then, liquid A, liquid B and liquid C are stirred and mixed in a volume ratio of 1:(1.2-1.5):(1.2-1.5) to obtain a rust remover, wherein the rust remover and the waste liquid from the cleaning do not generate acid mist and corrode the structure of steel, and have corrosion resistance and prevent secondary corrosion. However, the raw materials contain organic phosphorus, which increases the environmental risk and the cost of wastewater treatment.

[0006] Therefore, there is an urgent need for a rust remover with the three-in-one effects of rust removal, film formation and rust prevention, which has the ability of rapid rust removal, long-term rust prevention and film formation, and is also environmentally friendly. Summary of the invention

[0007] In view of the existing technical problems, the object of the present invention is to provide a rust remover with three-in-one functions of rust removal, film formation and rust prevention and a preparation method thereof. The rust remover of the present invention has uniform film formation, good rust removal and rust prevention effects, is environmentally friendly, pollution-free, and has good application value.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] On one hand, the present invention provides a rust remover with three-in-one functions of rust removal, film formation and rust prevention, comprising agent A and agent B. In parts by weight, agent A comprises the following raw materials: 5-10 parts of modified aminosilane coupling agent, 15-30 parts of organic acid, 5-15 parts of modified diatomaceous earth, and 150-300 parts of water; agent B comprises the following raw materials: 5-10 parts of corrosion inhibitor and 100-150 parts of water.

[0010] The reaction mechanism and effects of the present invention are as follows:

[0011] 1. Aminosilane coupling agent can form a stable protective film with the metal surface through its amino group, slowing down the reoxidation of the metal, and the amino group can react with the metal oxide at the same time, which is helpful for the dissolution and removal of rust. The present invention adopts diisooctyl sebacate to modify the aminosilane coupling agent, which can enhance the hydrophobicity and surface activity of the aminosilane coupling agent, make the rust remover contact with the oil stain on the metal surface better, improve the rust removal and oil removal efficiency, and the amide group generated by the reaction also has a rust removal effect. In addition, diisooctyl sebacate has lubricity, can reduce the wear and tear that may be caused by the metal surface during the rust removal process, and protect the metal surface finish.

[0012] 2. Diatomaceous earth has porosity, large specific surface area and pore volume, can absorb grease on metal surface, and improve degreasing efficiency. The present invention activates diatomaceous earth by alkaline substances, which can not only increase the pore size, pores and specific surface area of ​​diatomaceous earth, provide more adsorption sites, but also help to destroy some weak chemical bonds on the surface of diatomaceous earth and reduce impurities, thereby exposing more active sites (silanol groups), so that it can better react with the silanol groups on the hydrolyzed silane coupling agent, dehydrate and condense to form stable Si-O-Si bonds, which helps to disperse diatomaceous earth in rust removal liquid. Further, the amino groups on the silane-modified diatomaceous earth and the amino groups on N, N-bis (2-hydroxyethyl) ethylenediamine are combined through hydrogen bonds to form the final modified diatomaceous earth.

[0013] The applicant introduced organic functional groups such as amino and hydroxyl groups on the surface of diatomaceous earth by selecting specific organic matter and adjusting the mass ratio for modification. The amino group can form a stable chelate with metal ions, which helps to remove rust on the metal surface, and its nucleophilicity will form a stable chemical adsorption with the metal surface to form a protective film to prevent further corrosion; the hydroxyl group can react with the metal surface oxide by forming hydrogen bonds, which helps to loosen and remove the rust layer.

[0014] In some embodiments, the method for preparing the modified aminosilane coupling agent comprises the following steps:

[0015] Add N-(2-aminoethyl)-3-aminopropyltrimethoxysilane and n-butanol into a reaction kettle, add diisooctyl sebacate under an inert gas atmosphere, heat to 80-90° C., reflux for 4-5 hours, separate by distillation for 1-1.5 hours, and cool to obtain a modified aminosilane coupling agent.

[0016] In some embodiments, the molar ratio of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane to diisooctyl sebacate is 1:(1-2).

[0017] In some embodiments, the organic acid is any one or more of malonic acid, citric acid, tartaric acid and benzoic acid.

[0018] In some embodiments, the method for preparing the modified diatomaceous earth comprises the following steps:

[0019] S1. Add diatomaceous earth and alkaline substance into the reaction kettle, stir for 1-2h, filter, wash and dry to obtain activated diatomaceous earth;

[0020] S2. Add the activated diatomaceous earth and ethanol obtained in step S1 into a reaction kettle, stir for 10-20 minutes, ultrasonically disperse for 5-10 minutes, then add a silane coupling agent, adjust the pH value to 6-6.5, heat to 40-45°C, keep warm and stir for 8-10 hours, dropwise add N,N-bis(2-hydroxyethyl)ethylenediamine, heat to 50-60°C, keep warm and stir for 10-12 hours, filter, wash, and dry to obtain modified diatomaceous earth.

[0021] In some embodiments, the mass ratio of diatomaceous earth to alkaline substance in step S1 is (1.5-2.5):1.

[0022] Preferably, the mesh size of the diatomaceous earth is 100-600 meshes.

[0023] Preferably, the alkaline substance in step S1 is sodium hydroxide or triethylamine.

[0024] In some embodiments, the mass ratio of the activated diatomaceous earth, the silane coupling agent and N,N-bis(2-hydroxyethyl)ethylenediamine in step S2 is (1.5-2):1:(2-2.8).

[0025] In some embodiments, the corrosion inhibitor is any one or more of triethanolamine, monoethanolamine, polyethylene glycol, sodium benzoate, and nitrite.

[0026] Preferably, the corrosion inhibitor is triethanolamine, polyethylene glycol 200 and nitrite.

[0027] Preferably, the nitrite is sodium nitrite and / or potassium nitrite.

[0028] Further preferably, the mass ratio of triethanolamine, polyethylene glycol 200 and nitrite is (1-3):1:(0.5-1).

[0029] In some embodiments, the mass ratio of agent A to agent B is (1.4-1.8):1.

[0030] Another aspect of the present invention provides a method for preparing a rust remover having three-in-one functions of rust removal, film formation and rust prevention, comprising the following steps:

[0031] (1) Pour water into container 1, add modified aminosilane coupling agent, organic acid, and modified diatomaceous earth in sequence, and stir to obtain agent A;

[0032] (2) Pour water into container 2, add corrosion inhibitor, and stir to obtain agent B;

[0033] (3) Mix agent A and agent B in proportion and stir to obtain a rust remover.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The rust remover prepared by the present invention has uniform film formation, good rust removal and rust prevention effects, hardly corrodes the structure of steel, is environmentally friendly, pollution-free, has good application value, and is suitable for promotion.

[0036] 2. The rust remover for metal surface treatment obtained by the present invention has a simple preparation process, easy-to-control conditions, low production cost, and is easy to industrialize.

[0037] 3. The modified diatomaceous earth of the present invention not only improves the dispersibility of the diatomaceous earth, but also enhances the selective adsorption of the diatomaceous earth to certain metal ions or organic pollutants.

[0038] 4. The modified aminosilane coupling agent of the present invention can not only enhance the hydrophobicity and surface activity of the aminosilane coupling agent, but also reduce the wear of the metal surface during the rust removal process and protect the smoothness of the metal surface. DETAILED DESCRIPTION

[0039] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, rather than to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0040] According to the ratios of the raw materials and the preparation methods specified in the following examples and comparative examples, various rust removers were prepared.

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

[0042] Polyethylene glycol: purchased from Hai'an Petrochemical Plant, Jiangsu Province, model PEG-200;

[0043] Diatomaceous earth: purchased from Nanyu Mineral Products Processing Plant in Lingshou County, mesh size 200;

[0044] Other raw materials are not specially specified and can be purchased from the market.

[0045] Preparation Example 1

[0046] The preparation method of modified aminosilane coupling agent A comprises the following steps:

[0047] 1 mol of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane and 0.5 mol of n-butanol were added to a reaction kettle, and under a nitrogen atmosphere, 1.5 mol of diisooctyl sebacate was added, heated to 85°C for reflux reaction for 5 hours, and distilled and separated at -0.1 MPa for 1 hour to remove low-boiling components, and cooled to room temperature to obtain modified aminosilane coupling agent A.

[0048] Preparation Example 2

[0049] The preparation method of modified aminosilane coupling agent B is the same as that of Preparation Example 1, except that 0.6 mol of diisooctyl sebacate is added.

[0050] Preparation Example 3

[0051] The preparation method of modified diatomite A comprises the following steps:

[0052] S1. 5 g of diatomaceous earth and 312.5 ml of 0.2 mol / L sodium hydroxide solution were added to the reactor, stirred for 1.5 h, filtered, washed with anhydrous ethanol three times, and dried at 60 ° C for 4 h to obtain activated diatomaceous earth;

[0053] S2. 4.86 g of the activated diatomite obtained in step S1 and 100 ml of anhydrous ethanol were added to the reactor, stirred for 15 min, ultrasonically dispersed for 8 min, and then 2.7 g of 3-aminopropyltrimethoxysilane was added. The pH value was adjusted to 6 with 3.5 mol / L acetic acid, heated to 40°C, stirred for 8 h, 6.48 g of N,N-bis(2-hydroxyethyl)ethylenediamine was added dropwise, the temperature was raised to 55°C, stirred for 12 h, filtered, washed 3 times with anhydrous ethanol, and then washed 3 times with deionized water, and dried at 80°C for 8 h to obtain modified diatomite A.

[0054] Preparation Example 4

[0055] The preparation method of modified diatomite B comprises the following steps:

[0056] S1. 5 g of diatomaceous earth and 312.5 ml of 0.2 mol / L sodium hydroxide solution were added to the reactor, stirred for 1.5 h, filtered, washed with anhydrous ethanol three times, and dried at 60 ° C for 4 h to obtain activated diatomaceous earth;

[0057] S2. Add 2.7 g of the activated diatomaceous earth obtained in step S1 and 100 ml of anhydrous ethanol to the reactor, stir for 15 min, ultrasonically disperse for 8 min, then add 2.7 g of 3-aminopropyltrimethoxysilane, adjust the pH value to 6 with 3.5 mol / L acetic acid, heat to 40°C, keep warm and stir for 8 h, add 6.48 g of N,N-bis(2-hydroxyethyl)ethylenediamine dropwise, heat to 55°C, keep warm and stir for 12 h, filter, wash 3 times with anhydrous ethanol, then wash 3 times with deionized water, and dry at 80°C for 8 h to obtain modified diatomaceous earth B.

[0058] Preparation Example 4

[0059] The preparation method of modified diatomite C comprises the following steps:

[0060] S1. 5 g of diatomaceous earth and 312.5 ml of 0.2 mol / L sodium hydroxide solution were added to the reactor, stirred for 1.5 h, filtered, washed with anhydrous ethanol three times, and dried at 60 ° C for 4 h to obtain activated diatomaceous earth;

[0061] S2. 4.86 g of the activated diatomaceous earth obtained in step S1 and 100 ml of anhydrous ethanol were added to the reactor, stirred for 15 min, ultrasonically dispersed for 8 min, and then 2.7 g of 3-aminopropyltrimethoxysilane was added. The pH value was adjusted to 6 with 3.5 mol / L acetic acid, heated to 40°C, stirred for 8 h, 2.7 g of N,N-bis(2-hydroxyethyl)ethylenediamine was added dropwise, the temperature was raised to 55°C, stirred for 12 h, filtered, washed 3 times with anhydrous ethanol, and then washed 3 times with deionized water, and dried at 80°C for 8 h to obtain modified diatomaceous earth C.

[0062] Preparation Example 5

[0063] The preparation method of modified diatomite D comprises the following steps:

[0064] S1. Add 5 g of diatomaceous earth and 125 ml of 0.2 mol / L sodium hydroxide solution into a reactor, stir for 1.5 h, filter, wash with anhydrous ethanol three times, and dry at 60 ° C for 4 h to obtain activated diatomaceous earth;

[0065] S2. 4.86 g of the activated diatomite obtained in step S1 and 100 ml of anhydrous ethanol were added to the reactor, stirred for 15 min, ultrasonically dispersed for 8 min, and then 2.7 g of 3-aminopropyltrimethoxysilane was added. The pH value was adjusted to 6 with 3.5 mol / L acetic acid, heated to 40°C, stirred for 8 h, 6.48 g of N,N-bis(2-hydroxyethyl)ethylenediamine was added dropwise, the temperature was raised to 55°C, stirred for 12 h, filtered, washed 3 times with anhydrous ethanol, and then washed 3 times with deionized water, and dried at 80°C for 8 h to obtain modified diatomite D.

[0066] Example 1

[0067] A rust remover with the three-in-one effects of rust removal, film formation and rust prevention, comprising an agent A and an agent B. In parts by weight, the agent A comprises the following raw materials: 7.5 parts of a modified aminosilane coupling agent A, 15 parts of citric acid, 7.5 parts of benzoic acid, 10 parts of modified diatomaceous earth A, and 225 parts of water; the agent B comprises the following raw materials: 4 parts of triethanolamine, 2002 parts of polyethylene glycol, 1.5 parts of sodium nitrite, and 125 parts of water; and the mass ratio of the agent A to the agent B is 1.6:1.

[0068] The preparation method of the rust remover of this embodiment comprises the following steps:

[0069] (1) Pour water into container 1, add modified aminosilane coupling agent A, citric acid, benzoic acid, and modified diatomaceous earth A in sequence, and stir for 45 minutes to obtain agent A;

[0070] (2) Pour water into container 2, add triethanolamine and polyethylene glycol 200, and stir for 10 minutes to obtain agent B;

[0071] (3) Mix Agent A and Agent B in proportion and stir for 30 minutes to obtain a rust remover.

[0072] Example 2

[0073] A rust remover with the three-in-one effects of rust removal, film formation and rust prevention, comprising an agent A and an agent B. In parts by weight, the agent A comprises the following raw materials: 5 parts of a modified aminosilane coupling agent A, 15 parts of citric acid, 5 parts of modified diatomaceous earth A, and 150 parts of water; the agent B comprises the following raw materials: 1.6 parts of triethanolamine, 1.6 parts of polyethylene glycol 200, 0.8 parts of potassium nitrite, and 100 parts of water; and the mass ratio of the agent A to the agent B is 1.4:1.

[0074] The preparation method of the rust remover of this embodiment comprises the following steps:

[0075] (1) Pour water into container 1, add modified aminosilane coupling agent A, citric acid, and modified diatomaceous earth A in sequence, and stir for 40 minutes to obtain agent A;

[0076] (2) Pour water into container 2, add triethanolamine and polyethylene glycol 200, and stir for 10 minutes to obtain agent B;

[0077] (3) Mix Agent A and Agent B in proportion and stir for 30 minutes to obtain a rust remover.

[0078] Example 3

[0079] A rust remover with the three-in-one effects of rust removal, film formation and rust prevention, comprising an agent A and an agent B. In parts by weight, the agent A comprises the following raw materials: 10 parts of a modified aminosilane coupling agent A, 20 parts of citric acid, 10 parts of tartaric acid, 16 parts of modified diatomaceous earth A, and 300 parts of water; the agent B comprises the following raw materials: 6 parts of triethanolamine, 2002 parts of polyethylene glycol, 1 part of sodium nitrite, 1 part of potassium nitrite, and 150 parts of water; and the mass ratio of the agent A to the agent B is 1.8:1.

[0080] The preparation method of the rust remover of this embodiment comprises the following steps:

[0081] (1) Pour water into container 1, add modified aminosilane coupling agent A, citric acid, tartaric acid, and modified diatomaceous earth A in sequence, and stir for 45 minutes to obtain agent A;

[0082] (2) Pour water into container 2, add triethanolamine and polyethylene glycol 200, and stir for 10 minutes to obtain agent B;

[0083] (3) Mix Agent A and Agent B in proportion and stir for 30 minutes to obtain a rust remover.

[0084] Example 4

[0085] A rust remover with three-in-one functions of rust removal, film formation and rust prevention and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified aminosilane coupling agent B is used to replace modified aminosilane coupling agent A.

[0086] Example 5

[0087] A rust remover with three-in-one functions of rust removal, film coating and rust prevention and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified diatomaceous earth B is used to replace modified diatomaceous earth A.

[0088] Example 6

[0089] A rust remover with three-in-one functions of rust removal, film coating and rust prevention and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified diatomaceous earth C is used to replace modified diatomaceous earth A.

[0090] Example 7

[0091] A rust remover with three-in-one functions of rust removal, film coating and rust prevention and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified diatomaceous earth D is used to replace modified diatomaceous earth A.

[0092] Comparative Example 1

[0093] A rust remover with three-in-one functions of rust removal, film formation and rust prevention and a preparation method thereof, the specific implementation manner is the same as that of Example 1, except that an equal amount of commercially available aminosilane coupling agent (N-(2-aminoethyl)-3-aminopropyltrimethoxysilane) is used to replace the modified aminosilane coupling agent A.

[0094] Comparative Example 2

[0095] A rust remover with three-in-one functions of rust removal, film formation and rust prevention and a preparation method thereof, wherein the specific implementation manner is the same as that of Example 1, except that an equal amount of commercially available diatomaceous earth is used to replace modified diatomaceous earth A.

[0096] Effect evaluation:

[0097] The rust removers prepared in the above Examples 1-7 and Comparative Examples 1-2 were tested and analyzed, and the specific results are shown in Table 1.

[0098] Performance Testing:

[0099] Add water to the rust remover to prepare an aqueous solution containing 20wt% of the rust remover. Take a 30*50*4 (unit: mm) rusty cast iron specimen and immerse it in the 20wt% rust remover solution. At room temperature and an ultrasonic 40kHz environment, record the time it takes for the rust on the surface of the rusty cast iron specimen to be completely removed.

[0100] Table 1

[0101]

[0102]

[0103] From the results in Table 1, it can be seen that the rust removers prepared in Examples 1-3 have a fast rust removal time and have good application value.

[0104] Compared with Example 1, when preparing the modified aminosilane coupling agent, the molar ratio of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane and diisooctyl sebacate was changed, the hydrophobicity was reduced, and the rust removal time was increased.

[0105] Compared with Example 1, in Example 5, the mass ratio of diatomite to alkaline substance is changed when preparing the modified diatomite, and the active sites are reduced, which is not conducive to the dispersibility of the modified diatomite, thereby affecting the rust removal time.

[0106] Compared with Example 1, in Example 6-7, the mass ratio of activated diatomaceous earth to silane coupling agent and N,N-bis(2-hydroxyethyl)ethylenediamine was changed in the preparation of modified diatomaceous earth, the organic functional groups such as amino and hydroxyl groups were reduced, the rust removal effect was worse, and the rust removal time was prolonged.

[0107] In Comparative Example 1, compared with Example 1, an equal amount of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane was used to replace aminosilane coupling agent A, and the hydrophobicity and surface activity were weakened, and the rust removal time was prolonged.

[0108] Compared with Example 1, in Comparative Example 2, an equal amount of commercially available diatomaceous earth was used to replace the modified diatomaceous earth A, the dispersibility was weakened, and the organic functional groups such as amino groups and hydroxyl groups were reduced, and the rust removal time was prolonged.

[0109] The above is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present application. Although the present application is disclosed as above in the preferred embodiment, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution.

Claims

1. A rust remover with three-in-one functions of rust removal, film formation and rust prevention, characterized in that: The invention comprises an agent A and an agent B. The agent A comprises the following raw materials in parts by weight: 5-10 parts of a modified aminosilane coupling agent, 15-30 parts of an organic acid, 5-15 parts of modified diatomaceous earth, and 150-300 parts of water; the agent B comprises the following raw materials: 5-10 parts of a corrosion inhibitor, and 100-150 parts of water.

2. A rust remover with three-in-one functions of rust removal, film formation and rust prevention according to claim 1, characterized in that: The preparation method of the modified aminosilane coupling agent comprises the following steps: Add N-(2-aminoethyl)-3-aminopropyltrimethoxysilane and n-butanol into a reaction kettle, add diisooctyl sebacate under an inert gas atmosphere, heat to 80-90° C., reflux for 4-5 hours, separate by distillation for 1-1.5 hours, and cool to obtain a modified aminosilane coupling agent.

3. The rust remover with three-in-one functions of rust removal, film formation and rust prevention according to claim 2, characterized in that: The molar ratio of the N-(2-aminoethyl)-3-aminopropyltrimethoxysilane to diisooctyl sebacate is 1:(1-2).

4. The rust remover with three-in-one functions of rust removal, film formation and rust prevention according to claim 1, characterized in that: The organic acid is any one or more of malonic acid, citric acid, tartaric acid and benzoic acid.

5. The rust remover with three-in-one functions of rust removal, film formation and rust prevention according to claim 1, characterized in that: The preparation method of the modified diatomite comprises the following steps: S1. Add diatomaceous earth and alkaline substance into the reaction kettle, stir for 1-2h, filter, wash and dry to obtain activated diatomaceous earth; S2. Add the activated diatomaceous earth and ethanol obtained in step S1 into a reaction kettle, stir for 10-20 minutes, ultrasonically disperse for 5-10 minutes, then add a silane coupling agent, adjust the pH value to 6-6.5, heat to 40-45°C, keep warm and stir for 8-10 hours, dropwise add N,N-bis(2-hydroxyethyl)ethylenediamine, heat to 50-60°C, keep warm and stir for 10-12 hours, filter, wash, and dry to obtain modified diatomaceous earth.

6. The rust remover with three-in-one functions of rust removal, film formation and rust prevention according to claim 5, characterized in that: The mass ratio of diatomaceous earth to alkaline substance in step S1 is (1.5-2.5):

1.

7. The rust remover with three-in-one functions of rust removal, film formation and rust prevention according to claim 5, characterized in that: The mass ratio of the activated diatomaceous earth, the silane coupling agent and N,N-bis(2-hydroxyethyl)ethylenediamine in step S2 is (1.5-2):1:(2-2.8).

8. The rust remover with three-in-one functions of rust removal, film formation and rust prevention according to claim 1, characterized in that: The corrosion inhibitor is any one or more of triethanolamine, monoethanolamine, polyethylene glycol, sodium benzoate and nitrite.

9. The rust remover with three-in-one functions of rust removal, film formation and rust prevention according to claim 1, characterized in that: The mass ratio of agent A to agent B is (1.4-1.8):

1.

10. A method for preparing the rust remover having the three-in-one functions of rust removal, film formation and rust prevention as claimed in any one of claims 1 to 9, characterized in that: The following steps are included: (1) Pour water into container 1, add modified aminosilane coupling agent, organic acid, and modified diatomaceous earth in sequence, and stir to obtain agent A; (2) Pour water into container 2, add corrosion inhibitor, and stir to obtain agent B; (3) Mix agent A and agent B in proportion and stir to obtain a rust remover.

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