Low-residue, high-rust-proof water-based rust preventive agent, rust-proof working fluid, and preparation method and application thereof

Abstract

The present application belongs to the technical field of rust inhibitors, and particularly relates to a low-residue, high-rust-proof water-based rust inhibitor, a rust-proof working fluid, a preparation method, and an application thereof. The low-residue, high-rust-proof water-based rust inhibitor provided by the present application promotes the effective penetration of rust-proof active ingredients into deep microporous defects on the metal surface by the addition of polysiloxane, thereby forming a dense and complete rust-proof protective film, thereby solving the technical problem in the prior art of the lack of a water-based rust inhibitor with good rust-proof effect and no residue.

Description

Technical Field

[0001] The present application belongs to the technical field of rust inhibitors, and in particular relates to a low-residue and high-rust-proof water-based rust inhibitor, a rust-proof working fluid, a preparation method, and applications. Background Art

[0002] Compared with non-ferrous metal workpieces such as aluminum, ferrous metal workpieces such as carbon steel and cast iron are more affected by environmental factors such as temperature, humidity, and stains. They are prone to corrosion due to chemical or electrochemical reactions, resulting in rework or even scrapping of the workpieces, which is a huge loss of manpower, material, and financial resources.

[0003] At present, in order to reduce the corrosion of ferrous metal workpieces, rust inhibitors are usually used to treat ferrous metal workpieces with rust during the machining process and storage process. Rust-proof oils in rust inhibitors have the disadvantages of being flammable and explosive, difficult to clean, and highly polluting, and are gradually being eliminated from the market. Water-based rust inhibitors in rust inhibitors usually add nitrite to improve the rust-proof effect. However, nitrite-based rust inhibitors are prone to form white spots on the surface of ferrous metal workpieces, affecting the appearance of ferrous metal workpieces. At the same time, nitrite is a carcinogen and long-term contact poses a safety hazard. Rust inhibitors that generally do not contain nitrite have poor rust-proof effects and are prone to leaving residues on the surface of metal workpieces. The existing technology lacks water-based rust inhibitors with good rust-proof effects and no residue. Summary of the Invention

[0004] In view of this, the present application provides a low-residue, high-rust-proof water-based rust inhibitor, a rust-proof working fluid, a preparation method and an application thereof, to solve the technical problem in the prior art of the lack of a water-based rust inhibitor with good rust-proof effect and no residue.

[0005] In a first aspect, the present application provides a water-based rust inhibitor with low residue and high rust prevention properties, the raw materials of which include: polyacid isomeric alcohol amide, polyethylene polyamine, polysiloxane, isomeric alcohol ether and water solvent.

[0006] Preferably, the polyacid isomeric alcohol amide is polyacid isomeric alcohol amide DX320;

[0007] The polysiloxane includes but is not limited to organo-modified polysiloxane 3580;

[0008] The polyethylene polyamines include but are not limited to the molecular formula C 12 H5N7O 12 Polyethylene polyamines;

[0009] The isomeric alcohol ethers include but are not limited to at least one of isomeric decanol polyoxyethylene ether, isomeric undecanol polyoxyethylene ether, and isomeric tridecanol polyoxyethylene ether.

[0010] Preferably, the raw materials of the low-residue and high-rust-proof water-based rust inhibitor include:

[0011]

[0012] The second aspect of the present application provides a method for preparing a low-residue, high-rust-proof water-based rust inhibitor, which can be used to prepare the low-residue, high-rust-proof water-based rust inhibitor described in the first aspect. The preparation method includes the steps of: mixing polyacid isomeric alcohol amide, polyethylene polyamine, polysiloxane, isomeric alcohol ether and water solvent and stirring them evenly to obtain a low-residue, high-rust-proof water-based rust inhibitor.

[0013] The third aspect of the present application provides an application of a low-residue, high-rust-proof water-based rust inhibitor in rust prevention of ferrous metal workpieces.

[0014] A fourth aspect of the present application provides a low-residue, high-rust-proof aqueous rust inhibitor working solution, comprising 1 wt% to 30 wt% of a low-residue, high-rust-proof aqueous rust inhibitor;

[0015] The remaining amount of water solvent.

[0016] The fifth aspect of the present application provides a method for preparing a low-residue, high-rust-proof aqueous rust inhibitor working fluid, the preparation method comprising mixing a low-residue, high-rust-proof aqueous rust inhibitor and a water solvent, and stirring evenly to obtain a low-residue, high-rust-proof aqueous rust inhibitor working fluid.

[0017] In a sixth aspect, the present application provides an application of a low-residue, high-rust-proof aqueous rust inhibitor working fluid in rust prevention of ferrous metal workpieces.

[0018] Preferably, the ferrous metal workpiece includes at least one of a carbon steel workpiece, a pig iron workpiece, a ferroalloy workpiece, and a cast iron workpiece.

[0019] Preferably, the application specifically includes: covering the surface of the ferrous metal workpiece with a low-residue and high-rust-proof aqueous rust inhibitor working liquid to form a film.

[0020] Preferably, the covering method includes but is not limited to at least one of spraying, dipping, and brushing.

[0021] In summary, the present application provides a low-residue, high-rust-proof water-based rust preventive agent, a rust-proof working fluid, a preparation method, and an application. The water-based rust preventive agent provided by the present application comprises raw materials such as polyacid isomeric alcohol amides, polyethylene polyamines, polysiloxanes, isomeric alcohol ethers, and a water solvent. The isomeric alcohol ethers facilitate the dispersion and dissolution of the raw materials in the water solvent. The polyacid isomeric alcohol amides and polyethylene polyamines are rust-proof active ingredients. The N atoms in the rust-proof active ingredients can form coordination bonds with the iron atoms on the surface of ferrous metal workpieces, forming a protective film on the metal surface to achieve rust-proof effects. At the same time, As a water-based surfactant, polysiloxane has excellent leveling properties and substrate wettability. It can promote the penetration of rust-proof active ingredients such as polyacid isomeric alcohol amides and polyethylene polyamines into deep microporous defects on the metal surface, promote the formation of a dense and complete protective film in every corner of the metal surface, extend the life of the rust-proof protective film, and improve the rust prevention time. At the same time, it also reduces the residue of rust-proof active ingredients such as polyacid isomeric alcohol amides and polyethylene polyamines on metal workpieces, thereby solving the technical problem of the lack of water-based rust inhibitors with good rust prevention effect and no residue in the existing technology. DETAILED DESCRIPTION

[0022] The present application provides a low-residue and high-rust-proof water-based rust inhibitor, a rust-proof working fluid, a preparation method, and an application thereof, which are used to solve the technical problem in the prior art of lacking a water-based rust inhibitor with good rust-proof effect and no residue.

[0023] The following will be a clear and complete description of the technical solutions of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0024] Example 1

[0025] Example 1 of the present application provides a method for preparing a water-based rust inhibitor with low residue and high rust resistance, the preparation method comprising weighing 6g of polyacid isomeric alcohol amide DX320, 0.8g of organic modified polysiloxane 3580, 0.2g of isomeric decanol polyoxyethylene ether, 2g of polyethylene polyamine (C 12 H5N7O 12 ) is added to 91 g of water and stirred with a stirrer until the mixture is uniformly mixed to obtain a water-based rust inhibitor with low residue and high rust prevention properties; among the preparation raw materials, the polyacid isomeric alcohol amide DX320 is selected from the product sold by Dexu New Materials (Guangzhou) Co., Ltd. with model DX320, which is composed of a variety of polycarboxylic acids and isomeric organic amines; and the organic modified polysiloxane 3580 is selected from the product sold by BASF with model EFKA-AFCONA-3580.

[0026] Example 2

[0027] Example 2 of the present application provides a method for preparing a water-based rust inhibitor with low residue and high rust resistance, the preparation method comprising weighing 8g of polyacid isomeric alcohol amide DX320, 1g of organic modified polysiloxane 3580, 0.4g of isomeric decanol polyoxyethylene ether, 2g of polyethylene polyamine (C 12 H5N7O 12 ) was added to 88.6 g of water and stirred thoroughly with a stirrer until the mixture was uniformly mixed to obtain a water-based rust inhibitor with low residue and high rust prevention properties; among the preparation raw materials, the polyacid isomeric alcohol amide DX320 was selected from the product sold by Dexu New Materials (Guangzhou) Co., Ltd. with model DX320, which is composed of polycarboxylic acid and isomeric organic amines; and the organic modified polysiloxane 3580 was selected from the product sold by BASF with model EFKA-AFCONA-3580.

[0028] Example 3

[0029] Example 3 of the present application provides a method for preparing a water-based rust inhibitor with low residue and high rust resistance, the preparation method comprising weighing 10g of polyacid isomeric alcohol amide DX320, 1.2g of organic modified polysiloxane 3580, 0.3g of isomeric decanol polyoxyethylene ether, 3g of polyethylene polyamine (C 12 H5N7O 12 ) was added to 85.5 g of water and stirred thoroughly with a stirrer until the mixture was uniformly mixed to obtain a water-based rust inhibitor with low residue and high rust resistance; among the preparation raw materials, the polyacid isomeric alcohol amide DX320 was selected from the product sold by Dexu New Materials (Guangzhou) Co., Ltd. with model DX320, which is composed of a variety of polycarboxylic acids and isomeric organic amines; and the organic modified polysiloxane 3580 was selected from the product sold by BASF with model EFKA-AFCONA-3580.

[0030] Example 4

[0031] Example 4 of the present application provides a method for preparing a water-based rust inhibitor with low residue and high rust resistance. As a comparative example of Example 3, the preparation method comprises weighing 10g of polyacid isomeric alcohol amide DX320, 0.3g of isomeric decanol polyoxyethylene ether, 3g of polyethylene polyamine (C 12 H5N7O 12 ) is added into 91 g of water and stirred with a stirrer until the mixture is uniform to obtain a water-based rust inhibitor; among the raw materials for preparation, polyacid isomeric alcohol amide DX320 is selected from the product sold by Dexu New Materials (Guangzhou) Co., Ltd. with model DX320, which is composed of a variety of polycarboxylic acids and isomeric organic amines.

[0032] Example 5

[0033] Example 5 of the present application provides an application example of the low-residue and high-rust-proof water-based rust inhibitor provided in Examples 1-4.

[0034] Among them, in order to improve the anti-rust effect, the low-residue and high-rust-proof water-based rust inhibitor can be directly applied to the surface of the ferrous metal workpiece by spraying, dipping, brushing, etc. to form an anti-rust protective film;

[0035] In order to reduce costs and to facilitate subsequent welding and other processes, a low-residue, high-rust-proof water-based rust inhibitor can be mixed with water to form a 0.5wt% to 10wt% working solution, which can then be applied to the surface of the ferrous metal workpiece by spraying, dipping, brushing, etc. to form an anti-rust protective film.

[0036] Experimental Example 1

[0037] Experimental Example 1 of the present application performs performance tests on the water-based rust inhibitors provided in Examples 1-4, conventional water-based rust inhibitors, and water-based rust inhibitors containing nitrite. The performance tests include rust prevention, hard water resistance, foaming, residual conditions, natural drying time, and nitrite content tests.

[0038] The rust prevention performance test process includes: first, dissolving the water-based rust inhibitor provided by Examples 1-4, a conventional water-based rust inhibitor, and a water-based rust inhibitor containing nitrite in water to prepare three working solutions with concentrations of 1 wt%, 3 wt%, and 5 wt%; then, taking filter paper and placing it in a culture dish, weighing 2 g ± 0.1 g of GG25 cast iron chips, and spreading them on the filter paper, pipetting 2 ml of the working solution with a dropper to wet all the cast iron chips, covering the culture dish, and allowing it to stand naturally at 18° C.-28° C. for 2 hours, washing the cast iron chips on the filter paper with tap water, immersing the filter paper in acetone solution for 5 seconds, and drying it naturally at room temperature (18° C.-28° C.), and then judging the rust prevention effect based on the number of rust spots on the filter paper. The specific evaluation of the rust prevention effect is shown in Table 1.

[0039]

[0040] Table 1

[0041] The foaming performance test procedure includes: first dissolving the water-based rust inhibitors provided in Examples 1-4, a conventional water-based rust inhibitor, and a water-based rust inhibitor containing nitrite in water to prepare a working solution with a concentration of 5 wt%. The sample is then poured into a 100 ml stoppered graduated cylinder, bringing the liquid level to 70 ml, and securely plugged. The cylinder is then shaken up and down for 1 minute, with the shaking distance of approximately 1 / 3 meter and a frequency of approximately 100-120 shakes / min. Upon stopping the shaking, the volume of foam on the liquid surface and the volume of residual foam on the liquid surface after 1 minute of quiescence are measured.

[0042] The performance test process for residual condition and natural drying time includes: first dissolving the water-based rust inhibitor provided in Examples 1-4, a conventional water-based rust inhibitor, and a water-based rust inhibitor containing nitrite in water to prepare a working solution with a concentration of 5wt%; immersing the polished and cleaned cast iron sheet in the prepared 5% working solution for 1 minute, then taking it out and leaving it naturally at room temperature to observe the drying time and residual condition of the liquid on the surface of the cast iron sheet.

[0043] The performance test process of hard water resistance includes: testing the hard water resistance of water-based rust inhibitors to artificial hard water of different hardness at room temperature in accordance with the test method in GB / T 7381-2010 "Test method for stability of surfactants in hard water". The hard water resistance of water-based rust inhibitors is evaluated based on the appearance of their solutions in artificially prepared hard water, such as clear, milky, turbid, a small amount of sediment or coagulant, or a large amount of sediment or coagulant.

[0044] The nitrite content test process includes: according to the test method in GB / T6144-2010 "Fully Synthetic Cutting Fluid", take a nitrite test strip, immerse the measuring end of the test paper in a water-based rust inhibitor with a mass fraction of 5% (15℃~30℃), take it out after 1 second, shake off the excess liquid on the test strip, and compare it with the standard color plate after 15 seconds to obtain NO 2- The test value of .

[0045] The test results of rust prevention, hard water resistance, foaming, residual conditions, natural drying time and nitrite content of the water-based rust inhibitor provided by Examples 1-4, conventional water-based rust inhibitor, and water-based rust inhibitor containing nitrite are shown in Table 2.

[0046]

[0047] Table 2

[0048] In Table 2, the composition of the water-based rust inhibitor includes: 5% triethanolamine borate, 2% dibasic acid, 3% tribasic acid, 6% triethanolamine and 84% water; the composition of the water-based rust inhibitor containing nitrite includes 4% triethanolamine borate, 1% tall oil diethanolamide, 3% diethanolamine, 0.5% benzotriazole, 5% sodium nitrite, and 86.5% water.

[0049] As can be seen from Table 2, compared with water-based rust inhibitors containing nitrite, the water-based rust inhibitors provided in Examples 1-4 of the present application do not contain nitrite, and are non-toxic and environmentally friendly water-based rust inhibitors. Long-term contact is not likely to cause safety hazards, and will not form white spots on the surface of ferrous metal workpieces. At the same time, when the water-based rust inhibitor was subjected to a hard water resistance test, no turbidity appeared in hard water with a concentration of 500ppm, while turbidity appeared in hard water with a concentration of 1000ppm and above, which shows that the water-based rust inhibitor is not suitable for rust prevention in areas with hard water. It was also observed that the water-based rust inhibitor had obvious residues in the residue test and a long natural drying time. Compared with the water-based rust inhibitor, the water-based rust inhibitor provided in Examples 1-4 of the present application did not appear turbidity in hard water with a concentration of 2000ppm, which shows that the water-based rust inhibitor provided in Examples 1-4 of the present application has a better effect in resisting hard water, can be used for rust prevention in areas with hard water, will not precipitate, has excellent rust prevention performance, and has a fast drying time, which is conducive to improving production efficiency in industry.

[0050] Furthermore, by comparing the water-based rust preventive provided in Examples 1-3 of the present application with the water-based rust preventive provided in Example 4, it can be found that a small amount of residue will appear after the water-based rust preventive provided in Example 4 is applied to the surface of the cast iron sheet of the ferrous metal workpiece, and the rust area is less than 1%, while the water-based rust preventive provided in Examples 1-3 does not leave any residue on the surface of the cast iron sheet of the ferrous metal workpiece, and no rust occurs. This is because polysiloxane, as a water-based surfactant, has excellent leveling and substrate wettability, and can promote the penetration of rust-proof active ingredients such as polyacid isomeric alcohol amides and polyethylene polyamines into deep microporous defects on the metal surface, and promote the formation of a dense and complete protective film in all corners of the metal surface, which is beneficial to extend the life of the rust-proof protective film and increase the anti-rust time. At the same time, it also reduces the residue of rust-proof active ingredients such as polyacid isomeric alcohol amides and polyethylene polyamines on the metal workpiece. Therefore, compared with the water-based rust preventive provided in Example 4, Examples 1-3 of the present application provide a low-residue, high-rust-proof water-based rust preventive.

[0051] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A low-residue, high-rust-proof water-based rust inhibitor, characterized in that: Ingredients include: Polyacid isomeric alcohol amides, polyethylene polyamines, polysiloxanes, isomeric alcohol ethers and aqueous solvents; The polysiloxane includes organic modified polysiloxane 3580; The isomeric alcohol ethers include at least one of isomeric decanol polyoxyethylene ether, isomeric undecanol polyoxyethylene ether, and isomeric tridecanol polyoxyethylene ether; The low-residue and high-rust-proof water-based rust inhibitor comprises the following raw materials: Polyacid isomeric alcohol amide 3wt%~10wt%; Polyethylene polyamine 1wt%~3wt%; Polysiloxane 0.5wt%~1.5wt%; Isomeric alcohol ether 0.2wt%~0.6wt%; The remaining amount of water solvent.

2. The low-residue, high-rust-proof water-based rust inhibitor according to claim 1, characterized in that: The polyacid isomeric alcohol amide is polyacid isomeric alcohol amide DX320; The polyethylene polyamine includes a molecular formula of C 12 H5N7O 12 of polyethylene polyamines.

3. The method for preparing a low-residue and high-rust-proof water-based rust inhibitor according to any one of claims 1 to 2, characterized in that: The preparation method comprises the following steps: mixing polyacid isomeric alcohol amide, polyethylene polyamine, polysiloxane, isomeric alcohol ether and water solvent and stirring evenly to obtain a water-based rust preventive with low residue and high rust prevention performance.

4. Use of the low-residue, high-rust-proof water-based rust inhibitor according to any one of claims 1 to 2 in rust prevention of ferrous metal workpieces.

5. A low-residue and high-rust-proof aqueous rust-inhibitor working fluid, characterized in that: include: 1 wt% to 30 wt% of the low-residue, high-rust-preventive water-based rust inhibitor according to any one of claims 1 to 2; The remaining amount of water solvent.

6. Use of the low-residue, high-rust-proof aqueous rust inhibitor working fluid according to claim 5 in rust prevention of ferrous metal workpieces.

7. The use according to claim 6, characterized in that The ferrous metal workpiece includes at least one of a carbon steel workpiece, a pig iron workpiece, a ferroalloy workpiece, and a cast iron workpiece.

8. The use according to claim 6, characterized in that The application specifically includes: applying a low-residue and high-rust-proof water-based rust-inhibiting agent working fluid to the surface of a ferrous metal workpiece to form a film.

9. The use according to claim 8, characterized in that The covering method includes at least one of spraying, dipping, and brushing.

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