Cold-rolled sheet strip steel anti-rust oil with self-repairing function and preparation method thereof

Abstract

The invention discloses cold-rolled sheet strip steel anti-rust oil with a self-repairing function and a preparation method of the anti-rust oil. The anti-rust oil comprises the following components in parts by mass: 40-50 parts of compound base oil, 20-30 parts of a compound anti-rust agent, 1-3 parts of a compound surface modifier, 10-20 parts of a compound self-repairing agent, 1-5 parts of a compound antioxidant, 1-3 parts of a compound anti-foaming agent, 1-4 parts of a compound dispersing agent and 5-15 parts of a compound environment-friendly solvent, the anti-rust oil not only has good environmental protection performance and excellent anti-rust effect, but also can automatically repair a damaged protective film in the use process, so that the anti-rust period is prolonged, and the maintenance cost is reduced; meanwhile, the preparation method is simple and easy to implement, low in cost and suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of metal rust prevention, and in particular relates to a cold-rolled strip steel rust prevention oil with a self-repairing function and a preparation method thereof. Background Art

[0002] Cold-rolled steel strip, as an indispensable basic material in modern industry, has a wide range of applications, from automobile manufacturing, home appliance production to the construction industry. However, this material inevitably faces a major problem of "rust" during production, storage, transportation and use. 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. In order to prevent the rust of cold-rolled steel strip, the traditional practice is to apply a layer of anti-rust oil on its surface; these anti-rust oils usually contain some anti-rust agents that can react chemically or physically adsorb with the metal surface, thereby forming a protective film on the metal surface to isolate water and oxygen erosion; however, traditional anti-rust oils have some shortcomings that are difficult to overcome. First, traditional anti-rust oils have environmental problems: many traditional anti-rust oils contain a large amount of volatile organic compounds (VOCs), which will evaporate into the air during use, not only polluting the environment, but also causing harm to human health. With the improvement of environmental awareness and the increasingly stringent environmental regulations, the use of these traditional anti-rust oils has been increasingly restricted. Secondly, the service life issue: the protective film formed by traditional anti-rust oils is often fragile and easily damaged by mechanical damage or chemical erosion. Once damaged, it will lose its anti-rust effect, causing the steel to rust rapidly. Therefore, traditional anti-rust oils need to be replaced or replenished regularly, which not only increases maintenance costs, but also affects production efficiency. In addition, traditional anti-rust oils have some other problems, such as insufficient lubrication performance and poor stability. These problems limit the application of traditional anti-rust oils in the field of cold-rolled sheet and strip steel anti-rust. Summary of the invention

[0003] The present invention aims to provide a cold-rolled steel plate and strip antirust oil with self-repairing function and a preparation method thereof, the antirust oil not only has good environmental performance and excellent antirust effect, but also has a self-repairing function, which can automatically repair the damaged protective film during use, thereby extending the antirust period and reducing maintenance costs. At the same time, the preparation method is simple and easy, low in cost, and suitable for industrial production.

[0004] In order to achieve the above-mentioned purpose of the invention, the present invention provides a cold-rolled sheet and strip steel antirust oil with self-repairing function, wherein the antirust oil comprises the following components in parts by weight: 40 to 50 parts of compound base oil, 20 to 30 parts of compound rust inhibitor, 1 to 3 parts of compound surface modifier, 10 to 20 parts of compound self-repairing agent, 1 to 5 parts of compound antioxidant, 1 to 3 parts of compound antifoaming agent, 1 to 4 parts of compound dispersant, and 5 to 15 parts of compound environmentally friendly solvent.

[0005] In the above technical solution, further, the compound base oil is 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 base oil components. These two base oils have good lubrication performance and stability, and provide a good carrier for the subsequently added pharmaceutical agent.

[0006] The compound rust preventive is prepared by mixing barium petroleum sulfonate, dodecenyl succinic acid and lanolin magnesium soap in a weight ratio of (1-2): 1: 1. In order to enhance the rust prevention performance, barium petroleum sulfonate, dodecenyl succinic acid and lanolin magnesium soap are added as rust preventive components. The three agents cooperate with each other to form a dense protective film on the metal surface, effectively preventing the occurrence of rust.

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

[0008] The composite self-repairing agent is composed of epoxy resin microcapsules and nano-repairing particles (the nano-repairing particles are TiO 2 Nano, with a particle size range of 30 to 50nm) is mixed in a weight ratio of (1 to 2): 1. Microencapsulated repair agents (epoxy resin microcapsules) and nano repair particles are introduced as self-repair agent components. When the anti-rust oil film is affected by external factors (such as mechanical damage, chemical corrosion, etc.) and cracks are generated, the expansion of the cracks will cause the microcapsules embedded in the anti-rust oil film to rupture due to stress. When the microcapsules rupture, the epoxy resin repair agents inside will quickly flow to the cracks under the action of capillaries. These repair agents can be quickly released and repair the damaged parts when the anti-rust oil film is damaged, thereby 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) are selected as antioxidant components, which can effectively inhibit the occurrence of oxidation reactions and protect other components in the formula from oxidation 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, and a polysiloxane antifoaming agent and a 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 antirust oil film and improve the flatness and appearance quality of the antirust 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 each component in the formula can be evenly dispersed and improve the stability of the formula.

[0012] The composite 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 composite of ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether is selected as the environmentally friendly solvent in the environmentally friendly solvent components, and the components of the subsequently discarded anti-rust oil can be degraded, which helps to reduce pollution to the environment.

[0013] A method for preparing the above-mentioned cold-rolled strip steel antirust oil with self-repairing function, the preparation method comprising the following steps:

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

[0015] ② Compound petroleum barium sulfonate, dodecenylsuccinic acid and lanolin magnesium soap in proportion to obtain a compound rust inhibitor, add the compound rust inhibitor to the compound base oil, heat the reactor to 75°C to 85°C, adjust the stirring speed to 600 to 800 rpm, and continue stirring for 45 to 60 minutes.

[0016] ③ The silane coupling agent, stearic acid and titanate coupling agent are compounded in proportion to prepare a compound surface modifier, and the compound surface modifier is added to the above-mentioned reactor, the reactor temperature is maintained at 75°C to 85°C, the stirring speed is increased to 800 to 1000 rpm, and the stirring time is 60 to 90 minutes.

[0017] ④ Compound the epoxy resin microcapsules and nano-repair particles in proportion to prepare a compounded self-repairing agent, add the compounded self-repairing agent into the above-mentioned reaction kettle, control the temperature at 80°C to 85°C, stir at a speed of 1000 to 1200 rpm, and continue stirring for 120 to 150 minutes.

[0018] ⑤ Compound 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in proportion to obtain a compound antioxidant, add the compound antioxidant into the above-mentioned reaction kettle, maintain the temperature at 85° C. to 90° C., and stir at a speed of 1200 to 1500 rpm for 45 to 60 minutes.

[0019] ⑥ Polyethylene glycol and dimethyl silicone oil are compounded in proportion to prepare a compound antifoaming agent, polyisobutylene succinimide and fatty acid polyethylene glycol ester are compounded in proportion to prepare a compound dispersing agent, the compound antifoaming agent and the compound dispersing agent are added to the reaction kettle respectively, and the reaction kettle is heated to 90°C to 95°C, and stirring is continued at a speed of 1500 to 2000 rpm for 120 to 150 minutes.

[0020] ⑦ Ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether are compounded in a ratio of 3:2:1 to prepare a compound environmentally friendly solvent, and the compound environmentally friendly solvent is added to the above-mentioned reactor in proportion, the temperature is maintained at 90°C to 95°C, and stirring is continued at a speed of 1800 to 2000 rpm for 120 to 150 minutes, and then the reactor is cooled to room temperature to obtain a cold-rolled sheet steel anti-rust oil with self-repairing function.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a cold-rolled strip steel antirust oil with self-repairing function and a preparation method thereof, wherein the antirust oil can effectively extend the corrosion resistance of the cold-rolled strip steel product. The antirust oil prepared by adopting the formula has excellent antirust performance and wetting performance, can meet the requirements of the antirust oil under different working conditions, and can bring considerable economic and environmental benefits to the enterprise. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with specific examples, but the present invention is not limited in any way. To avoid redundant description, the raw materials in the following examples are all commercially available products unless otherwise specified, and the methods used are all conventional methods unless otherwise specified.

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

[0025] The matters not described in the following embodiments are the same as the description of the above specific implementation methods.

[0026] Example

[0027] A cold-rolled strip steel antirust oil with self-repairing function. The components and contents of the antirust oils in Examples 1-10 are shown in Table 1.

[0028] Table 1 Components and contents of antirust oil for cold-rolled steel strip with self-repairing function in Examples 1-10

[0029]

[0030] A method for preparing the above-mentioned cold-rolled strip steel antirust oil with self-repairing function, the specific process steps are:

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

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

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

[0034] ③ The silane coupling agent, stearic acid and titanate coupling agent are compounded in proportion to prepare a compound surface modifier, and the compound surface modifier is added to the above-mentioned reactor, the reactor temperature is maintained at 85° C., the stirring speed is increased to 1000 rpm, and the stirring time is 90 minutes.

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

[0036] ④ Compound the epoxy resin microcapsules and nano-repair particles in proportion to prepare a compounded self-repairing agent, add the compounded self-repairing agent into the above-mentioned reaction kettle, control the temperature to 85° C., stir at a speed of 1200 rpm, and continue stirring for 150 minutes.

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

[0038] ⑤ Compound 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in proportion to prepare a compound antioxidant, add the compound antioxidant into the above-mentioned reaction kettle, maintain the temperature at 90° C., and stir at a speed of 1500 rpm for 60 minutes.

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

[0040] ⑥ Polyethylene glycol and dimethyl silicone oil are compounded in proportion to prepare a compound antifoaming agent, polyisobutylene succinimide and fatty acid polyethylene glycol ester are compounded in proportion to prepare a compound dispersant, the compound antifoaming agent and the compound dispersant are added to the reactor respectively, and the reactor is heated to 95°C and stirred at a speed of 2000 rpm for 150 minutes.

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

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

[0043] ⑦ Ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether are compounded in a ratio of 3:2:1 to prepare a compound environmentally friendly solvent, and the compound environmentally friendly solvent is added to the above-mentioned reactor in proportion, the temperature is maintained at 95°C, and stirring is continued at 2000 rpm for 150 minutes, and then the reactor is cooled to room temperature to obtain a cold-rolled sheet steel anti-rust oil with self-repairing function.

[0044] The composite 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 at a stirring speed of 400 rpm for 10 minutes.

[0045] According to the above process flow, a cold-rolled steel strip antirust oil with self-repairing function is prepared. The test pieces are immersed in the cold-rolled steel strip antirust oil with self-repairing function prepared in Examples 1-10, and the test pieces are taken out and the antirust performance is tested according to SHT 0533 "Rust Assessment Method for Rust Test Pieces of Antirust Grease". In addition, the wetting angle of the antirust oil on the test piece is measured by the Sessiledrops method using the Dataphysics OCA50 fully automatic contact angle meter. The experimental temperature is room temperature, and the droplet volume is controlled to 4μl using a precision syringe. The instrument measures an angle range of 0 to 180°, the video speed is 120 images per second, the measurement error is ±0.1°, and the average value is taken after multiple measurements. Before the experiment, the test piece was cleaned with petroleum ether and dried for standby use. Each time the antirust oil of Example 1-10 was replaced, petroleum ether was used to clean it to reduce the experimental error. Since the surface tension acts on the surface of the test piece to spread 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 its wetting angle. Table 2 shows the implementation technical effects of the products obtained in Examples 1-10.

[0046] Table 2 Implementation technical effects of products obtained in Examples 1-10

[0047]

[0048] For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A cold-rolled steel strip anti-rust oil with self-repairing function, characterized in that: The anti-rust 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-repairing agent, 1-5 parts of compound antioxidant, 1-3 parts of compound anti-foaming agent, 1-4 parts of compound dispersant and 5-15 parts of compound environmentally friendly solvent.

2. The rust-proof oil according to claim 1, characterized in that: The compound base oil is prepared by mixing refined mineral oil and synthetic ester in a weight ratio of (4-5):

3.

3. The rust-proof oil according to claim 1, characterized in that: The composite rust preventive is prepared by mixing petroleum barium sulfonate, dodecenylsuccinic acid and lanolin magnesium soap in a weight ratio of (1-2):1:

1.

4. The rust-proof oil according to claim 1, characterized in that: The composite surface modifier is prepared by mixing a silane coupling agent, stearic acid and a titanate coupling agent in a weight ratio of (1-2):1:

1.

5. The rust-proof oil according to claim 1, characterized in that: The composite self-repairing agent is prepared by mixing epoxy resin microcapsules and nanometer repairing particles in a weight ratio of (1-2):

1.

6. The rust-proof oil according to claim 1, characterized in that: The composite antioxidant is prepared by mixing 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in a weight ratio of 1:

1.

7. The rust-proof oil according to claim 1, characterized in that: The compound antifoaming agent is prepared by mixing polyethylene glycol and dimethyl silicone oil in a weight ratio of 1:

1.

8. The rust-proof oil according to claim 1, characterized in that: The compound dispersant is prepared by mixing polyisobutylene succinimide and fatty acid polyethylene glycol ester in a weight ratio of 1:

1.

9. The rust-proof oil according to claim 1, characterized in that: The composite 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.

10. A method for preparing the cold-rolled steel strip antirust oil with self-repairing function as claimed in claim 1, characterized in that: The preparation method comprises the following steps: ① Preheat the reactor to 65°C to 75°C, mix the refined mineral oil and synthetic ester in proportion, stir the reactor at a speed of 500 to 600 rpm for 30 to 45 minutes, and obtain a compound base oil; ② Compounding barium petroleum sulfonate, dodecenylsuccinic acid and lanolin magnesium soap in proportion to obtain a compound rust inhibitor, adding the compound rust inhibitor to the compound base oil, heating the reactor to 75° C. to 85° C., adjusting the stirring speed to 600 to 800 rpm, and continuously stirring for 45 to 60 minutes; ③ Compounding a silane coupling agent, stearic acid and a titanate coupling agent in proportion to obtain a compound surface modifier, adding the compound surface modifier into the above-mentioned reaction kettle, maintaining the temperature of the reaction kettle at 75° C. to 85° C., increasing the stirring speed to 800 to 1000 rpm, and stirring for 60 to 90 minutes; ④ Compounding epoxy resin microcapsules and nano-repairing particles in proportion to prepare a compounded self-repairing agent, adding the compounded self-repairing agent into the above-mentioned reaction kettle, controlling the temperature at 80° C. to 85° C., stirring at a speed of 1000 to 1200 rpm, and continuing stirring for 120 to 150 minutes; ⑤ Compounding 2,6-di-tert-butyl-p-cresol and N-phenyl-α-naphthylamine in proportion to obtain a compound antioxidant, adding the compound antioxidant into the above-mentioned reaction kettle, maintaining the temperature at 85° C. to 90° C., stirring at a speed of 1200 to 1500 rpm for 45 to 60 minutes; ⑥ Compounding polyethylene glycol and dimethyl silicone oil in proportion to prepare a compound antifoaming agent, compounding polyisobutylene succinimide and fatty acid polyethylene glycol ester in proportion to prepare a compound dispersant, adding the compound antifoaming agent and the compound dispersant to the above-mentioned reaction kettle respectively, and heating the reaction kettle to 90° C. to 95° C., and continuing to stir at a speed of 1500 to 2000 rpm for 120 to 150 minutes; ⑦ Ethyl lactate, propylene glycol methyl ether acetate and diethylene glycol butyl ether are compounded in a ratio of (2-3):2:1 to prepare a compound environmentally friendly solvent, and the compound environmentally friendly solvent is added to the above-mentioned reactor in proportion, the temperature is maintained at 90°C to 95°C, and stirring is continued at a speed of 1800 to 2000 rpm for 120 to 150 minutes, and then the reactor is cooled to room temperature to obtain a cold-rolled sheet steel anti-rust oil with self-repairing function.

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