A cold-rolled strip steel antirust oil containing TiO2 nanoparticles and a preparation method thereof

Abstract

The application discloses a cold-rolled strip steel antirust oil containing TiO2 nanoparticles and a preparation method thereof. The cold-rolled strip steel antirust oil comprises the following components: TiO2 nanoparticles, a composite surface modifier, a composite base oil, a composite antirust agent, a composite extreme pressure anti-wear agent, a composite oiliness agent, a composite antioxidant and a composite defoaming agent. The method combines nanotechnology and antirust technology to develop the antirust oil with excellent antirust performance. The TiO2 nanoparticles in nanoscale enhance the adhesion of the oil film, effectively improve the antirust performance and prolong the storage and service life of the cold-rolled strip steel.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal rust prevention, and particularly relates to a cold-rolled strip steel rust-proof oil containing TiO2 nanoparticles and a preparation method thereof. BACKGROUND

[0002] Cold-rolled strip steel is an important metal material and is widely used in the fields of automobiles, household appliances, buildings and the like. However, the cold-rolled strip steel is easily corroded and rusted in the process of processing, transportation and use, which not only affects its appearance and use performance, but also may cause safety hazards. The rust-proof oil as a commonly used metal surface rust-proof material can form a protective film to isolate the metal surface from contact with air, water and other corrosive media to achieve the purpose of rust prevention. The traditional rust-proof oil mainly uses petroleum base oil and a single rust-proof additive, and the rust-proof effect and use performance are limited. However, with the continuous progress of science and technology, the rust-proof oil gradually develops towards high efficiency, environmental protection and multi-function; among them, the application of nanotechnology has become an important milestone in the development of rust-proof oil. The addition of titanium dioxide nanoparticles in the rust-proof oil can significantly improve the weather resistance and protection performance of the rust-proof oil, and better protect the metal surface. By continuously optimizing the preparation method and formula proportion of titanium dioxide nanoparticles, the rust-proof performance of the rust-proof oil is improved to meet the needs of different purposes. At the same time, with the increasing emphasis on environmental protection and safety, the titanium dioxide nanoparticle-containing rust-proof oil as an environmentally friendly and safe metal rust-proof material will be more widely applied and promoted in the future. SUMMARY

[0003] The application combines nanotechnology and rust prevention technology, and develops a rust-proof oil with excellent rust prevention performance and stability by reasonably selecting and proportioning the components, so as to improve the protection effect and service life of the metal surface.

[0004] In order to achieve the above-mentioned application purposes, the application provides a cold-rolled strip steel rust-proof oil containing TiO2 nanoparticles, which comprises the following components in mass fraction: 3-10 parts of TiO2 nanoparticles, 2-10 parts of a composite surface modifier, 70-90 parts of a composite base oil, 5-15 parts of a composite rust-proof agent, 0.5-3 parts of a composite extreme pressure anti-wear agent, 1-5 parts of a composite oiliness agent, 1-5 parts of a composite antioxidant and 0.5-3 parts of a composite defoaming agent.

[0005] In the above technical solution, further, the TiO2 nanoparticles have a particle size in the range of 30-50 nm, and a smaller particle size is conducive to the uniform dispersion and stable existence of the nano-titanium dioxide in the rust-proof oil, thereby improving the rust-proof effect. Meanwhile, a smaller particle size also means a larger specific surface area, which can increase the contact area with the metal surface and form a denser rust-proof film. As one of the core rust-proof agents, the addition of titanium dioxide nanoparticles in the rust-proof oil can significantly improve the weather resistance and protective performance of the rust-proof oil, and plays a better protective role on the metal surface.

[0006] Further, the composite surface modifier is prepared by mixing silane coupling agent, stearic acid and octadecenoic acid in a weight ratio of (2-3):2:1, and the composite surface modifier is used to improve the dispersibility and stability of the titanium dioxide nanoparticles in the base oil, so that the nanoparticles are uniformly dispersed in the oil product.

[0007] Further, the composite base oil is prepared by mixing poly-alpha-olefin (PAO), dioctyl sebacate and triethyl phosphate in a weight ratio of (7-8):2:1, and the composite base oil serves as the main oily medium to achieve the effects of lubrication and rust prevention.

[0008] Further, the composite rust-proof agent is prepared by mixing barium petroleum sulfonate, aluminum stearate and zinc naphthenate in a weight ratio of (4-5):3:2.

[0009] The composite extreme pressure and anti-wear agent is prepared by mixing chlorinated sulfur, sulfurized fatty acid ester and trimethylphenyl phosphate in a weight ratio of 2:(2-3):1.

[0010] The composite oily agent is prepared by mixing stearic acid, butyl stearate and chlorinated paraffin in a weight ratio of 2:(2-3):1.

[0011] The composite antioxidant is prepared by mixing 2,6-di-tert-butyl-4-methylphenol (BHT) and dilauryl thiodipropionate (DLTDP) in a weight ratio of (1-2):1.

[0012] The composite defoaming agent is prepared by mixing methyl silicone oil and polyether defoaming agent (L62) in a weight ratio of 1:(1-2).

[0013] A preparation method of the above cold-rolled strip steel rust-proof oil containing TiO2 nanoparticles, the preparation method comprising the following steps:

[0014] ①Surface modification of TiO2 nanoparticles: TiO2 nanoparticles are mixed with the prepared composite surface modifier, and stirred at a speed of 800-1000 rpm at a temperature of 80-95°C for 120-150 minutes to ensure that the nanoparticles and the modifier are in sufficient contact and reaction. Then, the unreacted modifier and impurities are removed by filtration using a filter screen (filtering accuracy of 1-5 μm), and the surface-modified TiO2 nanoparticles are obtained by drying at a temperature of 90-120°C until the weight is constant.

[0015] ②Preheating of the composite base oil: The selected proportion of the composite base oil (a mixture of poly-alpha-olefins and dioctyl sebacate or triethyl phosphate) is placed in a heating container, and the heating device is turned on to gradually increase the temperature of the composite base oil to a range of 70-85°C. This temperature range helps to ensure uniform dispersion of the additives in the oil and reduces the deterioration of the oil quality caused by excessively high temperatures. The stirring speed is maintained at 800-1000 rpm, and the surface-modified TiO2 nanoparticles obtained in step ① are added and stirred for 30-45 minutes.

[0016] ③Addition of the composite anti-rust agent: A mixture of barium petroleum sulfonate, aluminum stearate, and zinc naphthenate is added, which can effectively protect the metal surface from corrosion. The addition is slow and uniform to avoid excessively high local concentrations, and the stirring speed is maintained at 900-1100 rpm for 15-20 minutes.

[0017] ④Addition of the composite extreme pressure anti-wear agent: A mixture of sulfur chloride, sulfidized fatty acid ester, and trimethylphenyl phosphate is added, which can significantly improve the extreme pressure performance and wear resistance of the rust-proof oil, and the stirring speed is maintained at 1300-1500 rpm for 15-20 minutes.

[0018] ⑤Addition of the composite oiliness agent: A mixture of stearic acid, butyl stearate, and chlorinated paraffin is added, which can enhance the lubricating performance and adhesion of the rust-proof oil, and the stirring speed is maintained at 1500-1700 rpm for 15-25 minutes.

[0019] ⑥Addition of the composite antioxidant: A mixture of 2,6-di-tert-butyl-4-methylphenol (BHT) and dilauryl thiodipropionate (DLTDP) is added, which can effectively prolong the service life of the rust-proof oil and prevent the oil from oxidizing and deteriorating, and the stirring speed is maintained at 1600-1800 rpm for 20-30 minutes.

[0020] ⑦Addition of the composite defoaming agent: Finally, a mixture of methyl silicone oil and polyether defoaming agent (L62) is added, which can eliminate the foam generated during the use of the rust-proof oil and improve the use effect, and the stirring speed is maintained at 1800-2000 rpm for 30-45 minutes.

[0021] ⑧ After all the above components have been added, continue stirring at a speed of 1800-2000 rpm for 120-150 minutes until the temperature of the rust-preventive oil drops to room temperature. This will give you a rust-preventive oil for cold-rolled strip steel containing TiO2 nanoparticles.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] This invention combines nanotechnology with rust prevention technology. By rationally selecting and proportioning the components, a rust-preventive oil with excellent rust prevention performance and stability is developed. Its nano-sized TiO2 particles enhance the adhesion and uniformity of the oil film, effectively improving rust prevention performance and extending the storage and service life of cold-rolled strip steel. Detailed Implementation

[0024] 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.

[0025] A rust-preventive oil for cold-rolled strip steel containing TiO2 nanoparticles, comprising the following components in parts by weight: 3-10 parts TiO2 nanoparticles, 2-10 parts composite surface modifier, 70-90 parts composite base oil, 5-15 parts composite rust inhibitor, 0.5-3 parts composite extreme pressure anti-wear agent, 1-5 parts composite oiliness agent, 1-5 parts composite antioxidant, and 0.5-3 parts composite defoamer.

[0026] A method for preparing the above-mentioned rust-preventive oil for cold-rolled strip steel containing TiO2 nanoparticles, the preparation method comprising the following steps:

[0027] ① Surface-modified TiO2 nanoparticles: TiO2 nanoparticles were mixed with a prepared composite surface modifier and stirred at 800-1000 rpm for 120-150 minutes at 80℃-95℃. The surface-modified TiO2 nanoparticles were then filtered and dried at 90℃-120℃ to constant weight to obtain surface-modified TiO2 nanoparticles.

[0028] ② Preheating of composite base oil: Heat the composite base oil to 70℃~85℃, stir at 800~1000 rpm, add the surface-modified TiO2 nanoparticles obtained in step ①, and stir for 30~45 minutes;

[0029] ③ Add the composite rust inhibitor, stir at a speed of 900-1100 rpm for 15-20 minutes;

[0030] ④ Add the composite extreme pressure anti-wear agent, stir at a speed of 1300-1500 rpm for 15-20 minutes;

[0031] ⑤ Add the composite oiliness agent, stir at a speed of 1500-1700 rpm for 15-25 minutes;

[0032] ⑥ Add the composite antioxidant, stir at 1600-1800 rpm for 20-30 minutes;

[0033] ⑦ Add the composite defoamer, stir at 1800-2000 rpm for 30-45 minutes;

[0034] ⑧ After all the above components have been added, stir at a stirring speed of 1800-2000 rpm for 120-150 minutes until the temperature of the rust-preventive oil drops to room temperature to obtain the rust-preventive oil for cold-rolled strip steel containing TiO2 nanoparticles.

[0035] Any aspects not described in the following embodiments are the same as those described in the specific embodiments above.

[0036] Example

[0037] A rust-preventive oil for cold-rolled strip steel containing TiO2 nanoparticles, the components and their mass content of the rust-preventive oils for cold-rolled strip steel in Examples 1-10 are shown in Table 1.

[0038] Table 1. Components and content of rust-preventive oils containing TiO2 nanoparticles for cold-rolled strip steel in Examples 1-10

[0039]

[0040] A method for preparing the above-mentioned rust-preventive oil for cold-rolled strip steel containing TiO2 nanoparticles, the preparation method comprising the following steps:

[0041] ① Surface-modified TiO2 nanoparticles: TiO2 nanoparticles (30 nm in diameter) were mixed with a prepared composite surface modifier and stirred at 1000 rpm for 150 minutes at 95°C to ensure full contact and reaction between the nanoparticles and the modifier. The mixture was then filtered through a 5 μm filter to remove unreacted modifier and impurities, and dried at 120°C to constant weight to obtain the surface-modified TiO2 nanoparticles.

[0042] The composite surface modifier is prepared by mixing silane coupling agent, stearic acid and octadecenoic acid in a weight ratio of 3:2:1 and stirring at a speed of 400 rpm for 20 minutes.

[0043] ② Preheating of the composite base oil: Place the selected proportion of composite base oil (a mixture of polyalphaolefin and dioctyl sebacate or triethyl phosphate) in a heating container, turn on the heating device, and gradually raise the temperature of the composite base oil to within the range of 85°C. This temperature range helps ensure uniform dispersion of the additives in the oil and reduces oil quality deterioration caused by excessive temperature. Maintain a stirring speed of 1000 rpm, add the surface-modified TiO2 nanoparticles obtained in step ①, and continue stirring for 45 minutes.

[0044] The composite base oil is prepared by mixing polyalphaolefin (PAO), dioctyl sebacate, and triethyl phosphate in a weight ratio of 8:2:1, and stirring at a speed of 500 rpm for 10 minutes.

[0045] ③ Add the composite rust inhibitor: Add a mixture of barium petroleum sulfonate, aluminum stearate, and zinc naphthenate at a weight ratio of 5:3:2. These rust inhibitors effectively protect metal surfaces from corrosion. Add slowly and evenly to avoid excessively high local concentrations, and maintain a stirring speed of 1100 rpm for 20 minutes.

[0046] ④ Add the composite extreme pressure anti-wear agent: The extreme pressure anti-wear agent can significantly improve the extreme pressure performance and anti-wear performance of the rust-preventive oil, and maintain a stirring speed of 1500 rpm for 20 minutes.

[0047] The composite extreme pressure anti-wear agent is prepared by mixing sulfur chloride, sulfurized fatty acid ester and tricresyl phosphate in a weight ratio of 2:3:1, and stirring at a speed of 400 rpm for 15 minutes.

[0048] ⑤ Add the composite oiliness agent: and maintain a stirring speed of 1700 rpm for 25 minutes. This oiliness agent can enhance the lubrication and adhesion properties of the rust-preventive oil.

[0049] The composite oiliness agent is prepared by mixing stearic acid, butyl stearate and chlorinated paraffin in a weight ratio of 2:3:1 and stirring at a speed of 600 rpm for 25 minutes.

[0050] ⑥ Add the aforementioned composite antioxidant: Add a mixture of 2,6-di-tert-butyl-4-methylphenol and disodium thiodipropionate, and maintain a stirring speed of 1600-1800 rpm for 30 minutes. This antioxidant can effectively extend the service life of the rust-preventive oil and prevent the oil from oxidizing and deteriorating.

[0051] The composite antioxidant was prepared by mixing 2,6-di-tert-butyl-4-methylphenol (BHT) and di-dodecyl thiodipropionate (DLTDP) in a weight ratio of 2:1, and stirring at a speed of 400 rpm for 20 minutes.

[0052] ⑦ Add the composite defoamer: Finally, add the mixture of silicone oil and polyether defoamer, and keep the stirring speed at 2000 rpm for 45 minutes. This defoamer can eliminate the foam generated by the rust-preventive oil during use and improve the effect of use.

[0053] The composite defoamer is prepared by mixing methyl silicone oil and polyether defoamer (L62) at a weight ratio of 1:2, and stirring at a speed of 300 rpm for 10 minutes.

[0054] ⑧ After all the above components have been added, continue stirring at a speed of 2000 rpm for 150 minutes until the temperature of the rust-preventive oil drops to room temperature, and you will get a cold-rolled strip rust-preventive oil containing TiO2 nanoparticles.

[0055] The above process was used to prepare rust-preventive oil for cold-rolled strip steel containing TiO2 nanoparticles. The test pieces were immersed in the rust-preventive oil for cold-rolled strip steel containing TiO2 nanoparticles prepared in Examples 1-10. After the test pieces were removed, the rust-preventive performance was tested according to SHT 0533 "Rust-preventive grease rust-preventive test piece rust corrosion evaluation method". Table 2 shows the implementation technical effect of the products prepared in Examples 1-10.

[0056] Table 2. Implementation technical effects of Examples 1-10

[0057]

[0058] 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 strip steel containing TiO2 nanoparticles, characterized in that, The cold-rolled strip steel rust-preventive oil comprises the following components in parts by weight: 3-10 parts TiO2 nanoparticles, 2-10 parts composite surface modifier, 70-90 parts composite base oil, 5-15 parts composite rust inhibitor, 0.5-3 parts composite extreme pressure anti-wear agent, 1-5 parts composite oiliness agent, 1-5 parts composite antioxidant, and 0.5-3 parts composite defoamer. The TiO2 nanoparticles have a particle size in the range of 30–50 nm. The composite surface modifier is prepared by mixing silane coupling agent, stearic acid and octadecenoic acid in a weight ratio of (2-3):2:1; The composite base oil is prepared by mixing polyalphaolefin (PAO), dioctyl sebacate, and triethyl phosphate in a weight ratio of (7-8):2:

1. The composite rust inhibitor is prepared by mixing barium petroleum sulfonate, aluminum stearate and zinc naphthenate in a weight ratio of (4-5):3:

2. The composite extreme pressure anti-wear agent is prepared by mixing sulfur chloride, sulfurized fatty acid ester and tricresyl phosphate in a weight ratio of 2:(2-3):

1. The composite oiliness agent is prepared by mixing stearic acid, butyl stearate and chlorinated paraffin in a weight ratio of 2:(2-3):

1. The composite antioxidant is prepared by mixing 2,6-di-tert-butyl-4-methylphenol and dodecanol thiodipropionate in a weight ratio of (1-2):

1. The composite defoamer is prepared by mixing silicone oil and polyether defoamer in a weight ratio of 1:(1-2).

2. A method for preparing the TiO2 nanoparticle-containing rust-preventive oil for cold-rolled strip steel as described in claim 1, characterized in that, The preparation method includes the following steps: ① Surface-modified TiO2 nanoparticles: TiO2 nanoparticles are mixed with a prepared composite surface modifier and stirred at 800-1000 rpm for 120-150 minutes at 80℃-95℃. The surface-modified TiO2 nanoparticles are then filtered and dried at 90℃-120℃ to constant weight to obtain surface-modified TiO2 nanoparticles. ② Preheating of composite base oil: Heat the composite base oil to 70℃~85℃, stir at 800~1000 rpm, add the surface-modified TiO2 nanoparticles obtained in step ①, and stir for 30~45 minutes; ③ Add the composite rust inhibitor, stir at a speed of 900-1100 rpm for 15-20 minutes; ④ Add the composite extreme pressure anti-wear agent, stir at a speed of 1300-1500 rpm for 15-20 minutes; ⑤ Add the composite oiliness agent, stir at a speed of 1500-1700 rpm for 15-25 minutes; ⑥ Add the composite antioxidant, stir at 1600-1800 rpm for 20-30 minutes; ⑦ Add the composite defoamer, stir at 1800-2000 rpm for 30-45 minutes; ⑧ After all the above components have been added, stir at a stirring speed of 1800-2000 rpm for 120-150 minutes until the temperature of the rust-preventive oil drops to room temperature to obtain the rust-preventive oil for cold-rolled strip steel containing TiO2 nanoparticles.

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