Anti-rust oil for cold-rolled steel strip with self-repairing function and preparation method thereof

Abstract

This invention discloses a self-healing rust-preventive oil for cold-rolled steel strip and its preparation method. The rust-preventive oil comprises the following components in parts by weight: 40-50 parts of compound base oil, 20-30 parts of compound rust inhibitor, 1-3 parts of compound surface modifier, 10-20 parts of compound self-healing agent, 1-5 parts of compound antioxidant, 1-3 parts of compound antifoaming agent, 1-4 parts of compound dispersant, and 5-15 parts of compound environmentally friendly solvent. This rust-preventive oil not only has good environmental performance and excellent rust prevention effect, but also can automatically repair the damaged protective film during use, thereby extending the rust prevention period and reducing maintenance costs. At the same time, the preparation method is simple, easy to implement, and inexpensive, making it suitable for industrial production.

Description

Technical Field

[0001] This invention belongs to the field of metal rust prevention technology, specifically relating to a rust-preventive oil for cold-rolled steel strip with self-healing function and its preparation method. Background Technology

[0002] Cold-rolled steel strip, as an indispensable basic material in modern industry, has a wide range of applications, from automobile manufacturing and home appliance production to the construction industry. However, this material inevitably faces a major problem during production, storage, transportation, and use: rust. Rust not only damages the aesthetics of steel, but more importantly, it significantly reduces the mechanical properties of steel, such as tensile strength and elongation, thereby affecting its service life and safety performance. To prevent rust on cold-rolled steel strip, the traditional method is to apply a layer of rust-preventive oil to its surface. These rust-preventive oils usually contain rust inhibitors that can chemically react or physically adsorb with the metal surface, thus forming a protective film that isolates water and oxygen corrosion. However, traditional rust-preventive oils have some insurmountable drawbacks. First, traditional rust-preventive oils pose environmental problems: many traditional rust-preventive oils contain large amounts of volatile organic compounds (VOCs), which evaporate into the air during use, polluting the environment and harming human health. With increasing environmental awareness and stricter environmental regulations, the use of these traditional rust-preventive oils has faced growing restrictions. Secondly, there's the issue of lifespan: the protective film formed by traditional rust-preventive oils is often fragile and easily damaged by mechanical or chemical corrosion. Once damaged, it loses its rust-preventive effect, leading to rapid corrosion of the steel. Therefore, traditional rust-preventive oils require regular replacement or replenishment, which not only increases maintenance costs but also affects production efficiency. Furthermore, traditional rust-preventive oils have other problems, such as insufficient lubrication and poor stability, all of which limit their application in the field of rust prevention for cold-rolled steel strip. Summary of the Invention

[0003] This invention aims to provide a self-healing rust-preventive oil for cold-rolled steel strip and its preparation method. This rust-preventive oil not only possesses excellent environmental performance and superior rust prevention, but also has a self-healing function, automatically repairing damaged protective films during use, thereby extending the rust-prevention period and reducing maintenance costs. Furthermore, the preparation method is simple, easy to implement, and inexpensive, making it suitable for industrial production.

[0004] To achieve the above-mentioned objective, this invention provides a rust-preventive oil for cold-rolled steel strip with self-healing function. The rust-preventive oil comprises the following components in parts by weight: 40-50 parts of compound base oil, 20-30 parts of compound rust inhibitor, 1-3 parts of compound surface modifier, 10-20 parts of compound self-healing agent, 1-5 parts of compound antioxidant, 1-3 parts of compound antifoaming agent, 1-4 parts of compound dispersant, and 5-15 parts of compound environmentally friendly solvent.

[0005] In the above technical solution, the compound base oil is further prepared by mixing refined mineral oil and synthetic ester in a weight ratio of (4-5):3. Refined mineral oil and synthetic ester are selected as the base oil components because these two base oils have good lubrication properties and stability, providing a good carrier for subsequently added agents.

[0006] The compound rust inhibitor is prepared by mixing barium petroleum sulfonate, dodecenyl succinic acid, and lanolin magnesium soap in a weight ratio of (1-2):1:1. To enhance rust prevention, barium petroleum sulfonate, dodecenyl succinic acid, and lanolin magnesium soap are added as rust inhibitor components. These three agents work together to form a dense protective film on the metal surface, effectively preventing rust.

[0007] The compound surface modifier is prepared by mixing silane coupling agent, stearic acid, and titanate coupling agent in a weight ratio of (1-2):1:1. The addition of silane coupling agent, stearic acid, and titanate coupling agent as surface modifier components not only serves as a surface modifier for titanium dioxide nanoparticles, improving their dispersibility in oils, but these agents can also chemically react with the substrate surface to form strong chemical bonds, thereby enhancing the performance of the protective film.

[0008] The compound self-healing agent is prepared by mixing epoxy resin microcapsules and nano-repair particles (the nano-repair particles are TiO2 nanoparticles with a particle size ranging from 30 to 50 nm) at a weight ratio of (1 to 2):1. By introducing microencapsulated repair agents (epoxy resin microcapsules) and nano-repair particles as self-healing agent components, when the anti-rust oil film is affected by external factors (such as mechanical damage, chemical corrosion, etc.) and cracks occur, the expansion of the cracks will cause the microcapsules embedded in the anti-rust oil film to rupture under stress. After the microcapsules rupture, the epoxy resin repair agent inside rapidly flows to the crack under capillary action. These repair agents can be quickly released and repair the damaged areas when the anti-rust oil film is damaged, extending the service life of the anti-rust oil film.

[0009] The compound antioxidant is prepared by mixing 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in a weight ratio of 1:1. 2,6-di-tert-butyl-p-cresol (BHT) and N-phenyl-α-naphthylamine (PANA) were selected as antioxidant components, as these antioxidants can effectively inhibit oxidation reactions and protect other components in the formulation from oxidative damage.

[0010] The compound antifoaming agent is prepared by mixing polyethylene glycol (PEG) and dimethyl silicone oil (T901) in a weight ratio of 1:1. Polysiloxane antifoaming agent and copolymer of ethyl acrylate and 2-ethylhexyl acrylate are added as antifoaming agent components to eliminate foam and bubbles that may appear on the surface of the anti-rust oil film, thereby improving the smoothness and appearance quality of the anti-rust oil film.

[0011] The compound dispersant is prepared by mixing polyisobutylene succinimide and fatty acid polyethylene glycol ester in a weight ratio of 1:1. Polyisobutylene succinimide and fatty acid polyethylene glycol ester are selected as dispersant components to ensure that the components in the formula can be uniformly dispersed and improve the stability of the formula.

[0012] The compounded environmentally friendly solvent is prepared by mixing ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether in a weight ratio of (2-3):2:1. The environmentally friendly solvent component is selected from the compound of ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether as its environmentally friendly solvent, which can degrade its components in subsequent waste rust-preventive oil and help reduce environmental pollution.

[0013] A method for preparing the above-mentioned self-healing rust-preventive oil for cold-rolled steel strip, the method comprising the following steps:

[0014] ① Preheat the reactor to 65℃~75℃, mix the refined mineral oil and synthetic ester in proportion, stir the reactor at 500~600 rpm for 30~45 minutes to obtain the compound base oil.

[0015] ② A compound rust inhibitor is prepared by compounding barium petroleum sulfonate, dodecenyl succinic acid and lanolin magnesium soap in a certain proportion. The compound rust inhibitor is added to the compound base oil. The reaction vessel is heated to 75℃~85℃ and stirred at 600~800 rpm for 45~60 minutes.

[0016] ③ A composite surface modifier is prepared by compounding silane coupling agent, stearic acid and titanate coupling agent in a certain proportion. The composite surface modifier is added to the above reaction vessel, the temperature of the reaction vessel is maintained at 75℃~85℃, the stirring speed is increased to 800~1000 rpm, and the stirring time is 60~90 minutes.

[0017] ④ Prepare a compound self-healing agent by compounding epoxy resin microcapsules and nano-repair particles in a certain proportion. Add the compound self-healing agent to the above reaction vessel, control the temperature at 80℃~85℃, stir at a speed of 1000~1200 rpm, and continue stirring for 120~150 minutes.

[0018] ⑤ A compound antioxidant is prepared by compounding 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in a certain proportion. The compound antioxidant is added to the above reaction vessel, the temperature is maintained at 85℃~90℃, and the mixture is stirred at a speed of 1200~1500 rpm for 45~60 minutes.

[0019] ⑥ A compound antifoaming agent is prepared by compounding polyethylene glycol and dimethyl silicone oil in a certain proportion, and a compound dispersant is prepared by compounding polyisobutylene succinimide and fatty acid polyethylene glycol ester in a certain proportion. The compound antifoaming agent and the compound dispersant are added to the reaction vessel respectively, and the reaction vessel is heated to 90℃~95℃ and stirred at a speed of 1500~2000 rpm for 120~150 minutes.

[0020] ⑦ A compound environmentally friendly solvent is prepared by compounding ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether in a ratio of 3:2:1. The compound environmentally friendly solvent is added to the above reaction vessel in proportion, the temperature is maintained at 90℃~95℃, and the mixture is stirred at a speed of 1800~2000 rpm for 120~150 minutes. Then the reaction vessel is cooled to room temperature to obtain a rust-preventive oil for cold-rolled steel strip with self-healing function.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] This invention provides a self-healing rust-preventive oil for cold-rolled steel strip and its preparation method. This rust-preventive oil can effectively extend the corrosion resistance of cold-rolled steel strip products. The rust-preventive oil prepared using this formula exhibits excellent rust prevention and wetting properties, meeting the needs of different working conditions and bringing considerable economic and environmental benefits to enterprises. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments, but this does not limit the invention in any way. To avoid redundancy, unless otherwise specified, the raw materials used in the following embodiments are all commercially available products, and the methods used are all conventional methods unless otherwise specified.

[0024] A self-healing rust-preventive oil for cold-rolled steel strip, comprising the following components in parts by weight: 40-50 parts of compound base oil, 20-30 parts of compound rust inhibitor, 1-3 parts of compound surface modifier, 10-20 parts of compound self-healing agent, 1-5 parts of compound antioxidant, 1-3 parts of compound antifoaming agent, 1-4 parts of compound dispersant, and 5-15 parts of compound environmentally friendly solvent.

[0025] Any aspects not described in the following embodiments are the same as those described in the specific embodiments above.

[0026] Example

[0027] A self-healing rust-preventive oil for cold-rolled steel strip, the components and contents of which are shown in Table 1 in Examples 1-10.

[0028] Table 1. Components and content of rust-preventive oils for self-healing cold-rolled steel strips in Examples 1-10

[0029]

[0030] A method for preparing the above-mentioned self-healing rust-preventive oil for cold-rolled steel strip includes the following specific process steps:

[0031] ① Preheat the reactor to 75°C, mix the refined mineral oil and synthetic ester at a weight ratio of 5:3, stir the reactor at 600 rpm for 45 minutes to obtain the compound base oil.

[0032] ② A compound rust inhibitor is prepared by compounding barium petroleum sulfonate, dodecenyl succinic acid and lanolin magnesium soap in a certain proportion. The compound rust inhibitor is added to the compound base oil, the reaction vessel is heated to 85°C, the stirring speed is adjusted to 800 rpm, and stirring is continued for 60 minutes.

[0033] The compound rust inhibitor is prepared by mixing barium petroleum sulfonate, dodecenyl succinic acid and lanolin magnesium soap in a weight ratio of 2:1:1 and stirring continuously at a stirring speed of 400 rpm for 30 minutes.

[0034] ③ A composite surface modifier is prepared by compounding silane coupling agent, stearic acid and titanate coupling agent in a certain proportion. The composite surface modifier is added to the above reaction vessel, the temperature of the reaction vessel is kept at 85°C, the stirring speed is increased to 1000 rpm, and the stirring time is 90 minutes.

[0035] The compound surface modifier is prepared by mixing silane coupling agent, stearic acid and titanate coupling agent in a weight ratio of 2:1:1 and stirring continuously at a stirring speed of 300 rpm for 20 minutes.

[0036] ④ Prepare a compound self-healing agent by compounding epoxy resin microcapsules and nano-repair particles in a certain proportion. Add the compound self-healing agent to the above reaction vessel, control the temperature at 85℃, stir at 1200 rpm, and continue stirring for 150 minutes.

[0037] The compound self-healing agent is prepared by mixing epoxy resin microcapsules and nano-repair particles at a weight ratio of 2:1 and stirring continuously at a stirring speed of 200 rpm for 30 minutes.

[0038] ⑤ A compound antioxidant was prepared by compounding 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in a certain proportion. The compound antioxidant was added to the above reaction vessel, the temperature was maintained at 90℃, and the mixture was stirred at 1500 rpm for 60 minutes.

[0039] The compound antioxidant was prepared by mixing 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in a weight ratio of 1:1 and stirring continuously at a stirring speed of 300 rpm for 20 minutes.

[0040] ⑥ A compound antifoaming agent is prepared by compounding polyethylene glycol and dimethyl silicone oil in a certain proportion, and a compound dispersant is prepared by compounding polyisobutylene succinimide and fatty acid polyethylene glycol ester in a certain proportion. The compound antifoaming agent and the compound dispersant are added to the reaction vessel respectively, and the reaction vessel is heated to 95°C and stirred at 2000 rpm for 150 minutes.

[0041] The compound antifoaming agent is prepared by mixing polyethylene glycol and dimethyl silicone oil in a weight ratio of 1:1 and stirring continuously at a stirring speed of 400 rpm for 10 minutes.

[0042] The compound dispersant is prepared by mixing polyisobutylene succinimide and fatty acid polyethylene glycol ester in a weight ratio of 1:1 and stirring continuously at a stirring speed of 200 rpm for 30 minutes.

[0043] ⑦ A compound environmentally friendly solvent is prepared by compounding ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether in a ratio of 3:2:1. The compound environmentally friendly solvent is added to the above reaction vessel in proportion, the temperature is maintained at 95°C, and the mixture is stirred at 2000 rpm for 150 minutes. Then the reaction vessel is cooled to room temperature to obtain a rust-preventive oil for cold-rolled steel strip with self-healing function.

[0044] The compounded environmentally friendly solvent is prepared by mixing ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether in a weight ratio of 3:2:1 and stirring continuously at a stirring speed of 400 rpm for 10 minutes.

[0045] A self-healing rust-preventive oil for cold-rolled steel strip was prepared according to the above process. Test pieces were immersed in the self-healing rust-preventive oils prepared in Examples 1-10. After removal, the rust-preventive performance was tested according to SHT 0533 "Rust-preventive Grease Rust-Preventive Test Pieces Rust Evaluation Method". Furthermore, a Dataphysics OCA50 fully automatic contact angle measuring instrument was used to measure the wetting angle of the rust-preventive oil on the test pieces using the sessiledrops method. The experimental temperature was room temperature, and a precision syringe was used to control the droplet volume to 4 μl. The instrument's measurement angle range was 0–180°, the video speed was 120 images per second, and the measurement error was ±0.1°. Multiple measurements were taken as the average value. Before the experiment, the test pieces were cleaned with petroleum ether and dried. Petroleum ether cleaning was performed each time the rust-preventive oil from Examples 1-10 was changed to reduce experimental error. Because the surface tension spreads the sample surface into a certain arc, the software automatically calculates the contact angles on the left and right sides after selecting the reference plane. When the contact angles at both ends are similar, the average value is taken as the wetting angle. Table 2 shows the implementation technical effects of the products obtained in Examples 1-10.

[0046] Table 2. Technical Effects of the Products Obtained in Examples 1-10

[0047]

[0048] For anyone skilled in the art, many possible variations and modifications can be made to the technical solutions of this invention, or equivalent embodiments can be modified based on the disclosed technical content, without departing from the scope of the technical solutions of this invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this invention without departing from the content of the technical solutions of this invention should still fall within the protection scope of the technical solutions of this invention.

Claims

1. A rust-preventive oil for cold-rolled steel strip with self-healing function, characterized in that, The rust-preventive oil comprises the following components in parts by weight: 40-50 parts of compound base oil, 20-30 parts of compound rust inhibitor, 1-3 parts of compound surface modifier, 10-20 parts of compound self-healing agent, 1-5 parts of compound antioxidant, 1-3 parts of compound antifoaming agent, 1-4 parts of compound dispersant, and 5-15 parts of compound environmentally friendly solvent; The compound base oil is prepared by mixing refined mineral oil and synthetic ester in a weight ratio of (4~5):3; The compound rust inhibitor is prepared by mixing barium petroleum sulfonate, dodecenyl succinic acid and magnesium lanolin soap in a weight ratio of (1~2):1:1; The compound surface modifier is prepared by mixing silane coupling agent, stearic acid, and titanate coupling agent in a weight ratio of (1~2):1:1; The compound self-healing agent is prepared by mixing epoxy resin microcapsules and nano-repair particles in a weight ratio of (1~2):1; The compound antioxidant was prepared by mixing 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in a weight ratio of 1:

1. The compound antifoaming agent is prepared by mixing polyethylene glycol and dimethyl silicone oil in a weight ratio of 1:

1. The compound dispersant is prepared by mixing polyisobutylene succinimide and fatty acid polyethylene glycol ester in a weight ratio of 1:

1. The compounded environmentally friendly solvent is prepared by mixing ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether in a weight ratio of (2~3):2:

1.

2. A method for preparing a self-healing rust-preventive oil for cold-rolled steel strip as described in claim 1, characterized in that, The preparation method includes the following steps: 1) Preheat the reactor to 65℃~75℃, mix the refined mineral oil and synthetic ester in proportion, stir the reactor at 500~600 rpm for 30~45 minutes to obtain the compound base oil; 2) A compound rust inhibitor is prepared by compounding barium petroleum sulfonate, dodecenyl succinic acid and lanolin magnesium soap in a certain proportion. The compound rust inhibitor is added to the compound base oil. The reaction vessel is heated to 75℃~85℃ and stirred at 600~800 rpm for 45~60 minutes. 3) Prepare a composite surface modifier by compounding silane coupling agent, stearic acid and titanate coupling agent in a certain proportion. Add the composite surface modifier to the above reaction vessel, keep the reaction vessel temperature at 75℃~85℃, increase the stirring speed to 800~1000 rpm, and stir for 60~90 minutes. 4) Prepare a compound self-healing agent by compounding epoxy resin microcapsules and nano-repair particles in a certain proportion. Add the compound self-healing agent to the above reaction vessel, control the temperature at 80℃~85℃, stir at a speed of 1000~1200 rpm, and continue stirring for 120~150 minutes. 5) Prepare a compound antioxidant by compounding 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in a certain proportion. Add the compound antioxidant to the above reaction vessel, maintain the temperature at 85℃~90℃, and stir at 1200~1500 rpm for 45~60 minutes. 6) Polyethylene glycol and dimethyl silicone oil are compounded in a certain proportion to prepare a compound antifoaming agent, and polyisobutylene succinimide and fatty acid polyethylene glycol ester are compounded in a certain proportion to prepare a compound dispersant. The compound antifoaming agent and the compound dispersant are added to the above reaction vessel, and the reaction vessel is heated to 90℃~95℃ and stirred at a speed of 1500~2000 rpm for 120~150 minutes. 7) Prepare a compounded environmentally friendly solvent by compounding ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether in a ratio of (2~3):2:

1. Add the compounded environmentally friendly solvent to the above reaction vessel in proportion, keep the temperature at 90℃~95℃, and continue stirring at 1800~2000 rpm for 120~150 minutes. Then cool the reaction vessel to room temperature to obtain a rust-preventive oil for cold-rolled steel strip with self-healing function.

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