A nanocomposite fluid hot rolling strip steel rolling lubricant and a method for preparing the same

Abstract

The application discloses a kind of nanocomposite fluid hot rolling plate strip steel rolling lubricant and preparation method thereof, the lubricant includes the following mass content components: graphene oxide coated TiO2 / MoS2 Composite nanoparticles 0.2~3.0wt%, surfactant 0.1~1.0wt%, polymer 0.1~3.0wt%, polyether 0.5~2.0wt%, stabilizer 0.1~2.0wt%, antioxidant 0.05~2.0wt%, fungicide 0.5~2.0wt%, defoaming agent 0.25~1.5wt%, pH regulator 0.5~5.0wt%, the rest is deionized water.The method is by adding nanocomposite material in lubricant, form uniform lubricating film in rolling process, effectively reduce roll wear, prolong the service life of roll;In addition, the lubricant also has the advantages such as excellent cooling, antirust, easy to clean and the like.

Description

Technical Field

[0001] This invention belongs to the field of lubrication technology for metal rolling processes, specifically relating to a nanocomposite fluid lubricant for hot-rolled steel strip and its preparation method. Background Technology

[0002] Hot-rolled strip steel is an important metallic material widely used in modern industry. However, during hot-rolled strip steel production, the roll surface is highly susceptible to wear due to the interaction of rolling pressure and friction, leading to numerous defects on the strip surface. Traditional roll surface repair methods include mechanical grinding and electrical discharge machining (EDM), but these methods have drawbacks, easily causing further damage to the roll surface, reducing roll life, and thus adversely affecting production efficiency and product quality. Furthermore, traditional hot-rolling oil-based lubricants suffer from numerous problems during use, such as harsh operating environments, easy corrosion and deterioration, and difficulty in handling sludge. In addition, under the harsh environment of high temperature, high speed, and high pressure in hot rolling, the roll surface is prone to cracking and even peeling, leading to premature roll failure. Summary of the Invention

[0003] To address the aforementioned problems in existing technologies, this invention incorporates nanocomposite materials into the lubricant, enabling the formation of a uniform lubricating film during rolling, effectively reducing roll wear and extending roll service life. The nanocomposite fluid not only forms an oxide film during hot rolling, providing lubrication and improving strip surface quality, but also contributes to cleaner production during hot rolling. Furthermore, it offers numerous advantages such as excellent cooling properties, rust prevention, cleaning properties, economy, and safety.

[0004] To achieve the above-mentioned objective, this invention provides a nanocomposite fluid lubricant for hot-rolled steel strip, the lubricant comprising the following components by mass: 0.2–3.0 wt% of graphene oxide-coated TiO2 / MoS2 composite nanoparticles, 0.1–1.0 wt% of surfactant, 0.1–3.0 wt% of polymer, 0.5–2.0 wt% of polyether, 0.1–2.0 wt% of stabilizer, 0.05–2.0 wt% of antioxidant, 0.5–2.0 wt% of bactericide, 0.25–1.5 wt% of defoamer, 0.5–5.0 wt% of pH adjuster, with the balance being deionized water.

[0005] The preparation method of the above-mentioned nanocomposite fluid hot-rolled strip steel rolling lubricant includes the following steps:

[0006] ① Add the graphene oxide-coated TiO2 / MoS2 composite nanoparticles, surfactants, polymers, polyethers, stabilizers, antioxidants, bactericides, defoamers, and pH adjusters to deionized water in proportion;

[0007] ② Use a magnetic stirrer for stirring and heating. Heat the temperature to 75℃~85℃, adjust the stirring speed to 1200~1500 rpm, and stir for 45~60 minutes.

[0008] ③The suspension obtained in step ② is ultrasonically treated for 90-120 minutes with an ultrasonic power of 450-500W, and then allowed to stand at room temperature to obtain a nanocomposite fluid hot-rolled strip steel rolling lubricant.

[0009] In the above technical solution, the graphene oxide-coated TiO2 / MoS2 composite nanoparticles are further composed of graphene oxide, MoS2 nanoparticles, and TiO2 nanoparticles; the particle size range of MoS2 nanoparticles and TiO2 nanoparticles is 30-50 nm, and the mass ratio of graphene oxide:MoS2 nanoparticles:TiO2 nanoparticles is (1-2):(1-2):1. The preparation process includes the following steps:

[0010] ① Disperse MoS2 nanoparticles in an organic solvent (any conventional organic solvent will do, such as ethanol, isopropanol, etc.), sonicate for 45-60 minutes at an ultrasonic power of 500-600W, and then add a surfactant to mix to obtain a MoS2 nanoparticle suspension.

[0011] ② Disperse TiO2 nanoparticles in an organic solvent and treat them with ultrasound for 45-60 minutes at an ultrasonic power of 500-600W to obtain a TiO2 nanoparticle suspension.

[0012] ③ The TiO2 nanoparticle suspension is dropped into the MoS2 nanoparticle suspension, and a surfactant is added at the same time. The ultrasonic power is adjusted to 600-800W and heated to 80℃-85℃. The ultrasonic time is 60-90 minutes to obtain a suspension of TiO2 / MoS2 composite nanoparticles.

[0013] ④ Add graphene oxide to the suspension obtained in step ③, adjust the ultrasonic power to 800-900W, heat to 85℃-90℃, and sonicate for 90-120 minutes to obtain a mixture.

[0014] ⑤ Centrifuge the mixed solution obtained in step ④ for 30 to 45 minutes at a speed of 12,000 to 15,000 rpm, and redisperse the resulting precipitate in ethanol to obtain a suspension.

[0015] ⑥ Filter the suspension obtained in step ⑤. The filter membrane has a pore size of 0.2 to 0.5 μm.

[0016] ⑦ Centrifuge the filtered suspension again for 45-60 minutes, adjusting the speed to 18,000-20,000 rpm. Wash and dry the obtained precipitate at 95℃-100℃ for 6-9 hours to finally obtain graphene oxide-coated TiO2 / MoS2 composite nanoparticles.

[0017] Furthermore, the surfactant is composed of sodium dodecylbenzenesulfonate (SDBS) and sodium dodecyl sulfate (SDS) in a compound mass ratio of sodium dodecylbenzenesulfonate (SDBS):sodium dodecyl sulfate (SDS) = (1~2):1. This composite surfactant can reduce the surface tension of the liquid, increase the affinity between nanoparticles and water, thereby reducing the interaction force between particles and preventing the particles from agglomerating. This helps to uniformly disperse nanomaterials in the lubricant and maintain their stability.

[0018] Furthermore, the polymer is composed of polyvinyl alcohol (PVA) and polyacrylamide (PAM) in a compound mass ratio of PVA:PAM = 2:(2-3). This polymer protects the metal surface in the form of a lubricating film, reducing chemical reactions such as oxidation and corrosion.

[0019] Furthermore, the polyether is composed of polyethylene glycol (PEG) and polyethylene oxide (POE) in a compound mass ratio of PEG:PE = 1:1, and the compounded polyether has a synergistic lubricating effect.

[0020] Furthermore, the stabilizer is polyvinylpyrrolidone (PVP). Due to the strong ability of the methylene carbon chain and highly polar lactone groups in the PVP molecule to form hydrogen bonds and complexes, it can be adsorbed onto the surface of nanoparticles. This adsorption, along with the steric shielding effect created by the hydrophilicity of PVP, gives PVP excellent dispersion stability for nanoparticles. In lubricants, this helps maintain the uniform distribution of nanoparticles, prevents their aggregation, and thus ensures the performance of the lubricant.

[0021] Furthermore, the antioxidant is composed of 2,6-di-tert-butyl-p-cresol (BHT) and di-tert-butyl carbonate, with a compound mass ratio of 2,6-di-tert-butyl-p-cresol (BHT): di-tert-butyl carbonate = (1-2):1. This composite antioxidant has good stability and low volatility, and it can effectively inhibit the oxidative degradation process of rolling lubricant, thereby extending its service life.

[0022] Furthermore, the bactericide is composed of triclosan (TCC), benzoic acid (PHB), and benzimidazole (BIT), with a compound mass ratio of triclosan:benzoic acid:benzimidazole = 1:(1~2):1. This compound bactericide can inhibit the growth of microorganisms in rolling lubricants. These microorganisms produce acidic substances during their metabolism, which leads to a decrease in the pH value of the lubricant, thereby affecting its lubrication performance and service life. The bactericide can effectively inhibit or kill these microorganisms, thereby maintaining the stability and performance of the lubricant.

[0023] Furthermore, the defoamer is composed of polydimethylsiloxane (PDMS), defoamer SE-15, and defoamer Y-30 emulsion, with a compounding ratio of PDMS: defoamer SE-15: defoamer Y-30 = 2:(2~3):2. This compound defoamer can help the lubricant to better form a uniform lubricating film between the rolls and the strip steel, thereby improving the lubrication effect and reducing friction and wear during the rolling process.

[0024] Furthermore, the pH adjuster is composed of sodium hydroxide (NaOH) and ammonium hydroxide (NH4OH) in a compound mass ratio of sodium hydroxide:ammonium hydroxide = 2:(2-3). This pH adjuster can adjust the acidity or alkalinity of the lubricant to ensure that it is within a suitable range, which is crucial for ensuring the stability and effectiveness of the lubricant.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] This invention provides a nanocomposite fluid lubricant for hot-rolled steel strip and its preparation method. The nanocomposite fluid lubricant has excellent lubrication performance and can provide good protection for the rolls and strip surface. In addition, the lubricant also has excellent effects in inhibiting metal oxidation and preventing rust. Moreover, the preparation method is simple and efficient, which fully meets the development needs of modern hot-rolled steel strip and also meets the needs of green and low-carbon development in the domestic steel industry. Detailed Implementation

[0027] 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.

[0028] A nanocomposite fluid lubricant for hot-rolled steel strip, the lubricant comprising the following components by mass: 0.2–3.0 wt% of graphene oxide-coated TiO2 / MoS2 composite nanoparticles, 0.1–1.0 wt% of surfactant, 0.1–3.0 wt% of polymer, 0.5–2.0 wt% of polyether, 0.1–2.0 wt% of stabilizer, 0.05–2.0 wt% of antioxidant, 0.5–2.0 wt% of bactericide, 0.25–1.5 wt% of defoamer, 0.5–5.0 wt% of pH adjuster, with the balance being deionized water.

[0029] The preparation method of the above-mentioned nanocomposite fluid hot-rolled strip steel rolling lubricant includes the following steps:

[0030] ① Add the graphene oxide-coated TiO2 / MoS2 composite nanoparticles, surfactants, polymers, polyethers, stabilizers, antioxidants, bactericides, defoamers, and pH adjusters to deionized water in proportion;

[0031] ② Use a magnetic stirrer for stirring and heating. Heat the temperature to 75℃~85℃, adjust the stirring speed to 1200~1500 rpm, and stir for 45~60 minutes.

[0032] ③The suspension obtained in step ② is ultrasonically treated for 90-120 minutes with an ultrasonic power of 450-500W, and then allowed to stand at room temperature to obtain a nanocomposite fluid hot-rolled strip steel rolling lubricant.

[0033] Any aspects not described in the following embodiments are the same as those described in the specific embodiments above.

[0034] Example

[0035] A nanocomposite fluid lubricant for hot-rolled steel strip is provided. The component mass content of the lubricants in Examples 1-10 is shown in Table 1.

[0036] Table 1. Composition and content (wt%) of the nano-composite fluid lubricant for hot-rolled strip steel in Examples 1-10

[0037]

[0038] Example 1-10: A method for preparing a nano-composite fluid lubricant for hot-rolled steel strip, comprising the following steps:

[0039] 1. Add the graphene oxide-coated TiO2 / MoS2 composite nanoparticles, surfactants, polymers, polyethers, stabilizers, antioxidants, bactericides, defoamers, and pH adjusters to deionized water in proportion.

[0040] The graphene oxide-coated TiO2 / MoS2 composite nanoparticles are composed of graphene oxide, MoS2 nanoparticles, and TiO2 nanoparticles. The particle size of the MoS2 nanoparticles and TiO2 nanoparticles ranges from 30 to 40 nm, and the mass ratio of graphene oxide:MoS2 nanoparticles:TiO2 nanoparticles is 2:2:1. The preparation process includes the following steps:

[0041] ① Disperse MoS2 nanoparticles in an organic solvent, sonicate for 60 minutes at an ultrasonic power of 600W, and then add a surfactant to mix to obtain a MoS2 nanoparticle suspension.

[0042] ②Disperse TiO2 nanoparticles in an organic solvent and sonicate them for 60 minutes at an ultrasonic power of 600W to obtain a TiO2 nanoparticle suspension.

[0043] ③ The TiO2 nanoparticle suspension was dropped into the MoS2 nanoparticle suspension, and a surfactant was added at the same time. The ultrasonic power was adjusted to 800W and heated to 85°C. The ultrasonic time was 90 minutes to obtain a suspension of TiO2 / MoS2 composite nanoparticles.

[0044] ④ Add graphene oxide to the suspension obtained in step ③, adjust the ultrasonic power to 900W, heat to 90℃, and ultrasonicate for 120 minutes to obtain the mixture.

[0045] ⑤ Centrifuge the mixed solution obtained in step ④ for 30-45 minutes at a speed of 15,000 rpm, and redisperse the precipitate in ethanol to obtain a suspension.

[0046] ⑥ Filter the suspension obtained in step ⑤. The filter membrane has a pore size of 0.2 μm.

[0047] ⑦ Centrifuge the filtered suspension again for 60 minutes at a speed of 20,000 rpm. Wash and dry the precipitate at 100°C for 9 hours to obtain graphene oxide-coated TiO2 / MoS2 composite nanoparticles.

[0048] The surfactant is prepared by mixing sodium dodecylbenzenesulfonate (SDBS) and sodium dodecyl sulfate (SDS) in a compound mass ratio of 2:1.

[0049] The polymer is composed of polyvinyl alcohol (PVA) and polyacrylamide (PAM), and is prepared by mixing them in a compound mass ratio of PVA:PAM = 2:3.

[0050] The polyether is composed of polyethylene glycol (PEG) and polyethylene oxide (POE), and is prepared by mixing PEG and POE in a compound mass ratio of 1:1.

[0051] The stabilizer is polyvinylpyrrolidone (PVP). Because the methylene carbon chain and strongly polar acyl group in the PVP molecule have a strong ability to form hydrogen bonds and complexes, they can be adsorbed on the surface of nanoparticles. This adsorption and the stereoprotective effect formed by the hydrophilicity of PVP give PVP excellent dispersion stability for nanoparticles.

[0052] The antioxidant is composed of 2,6-di-tert-butyl-p-cresol (BHT) and di-tert-butyl carbonate, and is prepared by mixing them in a compound mass ratio of 2,6-di-tert-butyl-p-cresol (BHT): di-tert-butyl carbonate = 2:1.

[0053] The bactericide is composed of triclosan (TCC), benzoic acid (PHB), and benzimidazole (BIT), and is prepared by mixing them in a compound mass ratio of triclosan:benzoic acid:benzimidazole = 1:2:1.

[0054] The defoamer is composed of polydimethylsiloxane (PDMS), defoamer SE-15, and defoamer Y-30 emulsion, and is prepared by mixing PDMS, defoamer SE-15 and defoamer Y-30 in a compounding ratio of 2:3:2.

[0055] The pH adjuster is composed of sodium hydroxide (NaOH) and ammonium hydroxide (NH4OH), and is prepared by mixing sodium hydroxide and ammonium hydroxide in a compound mass ratio of 2:3.

[0056] 2. Use a magnetic stirrer for stirring and heating. Heat the temperature to 85℃, adjust the stirring speed to 1500 rpm, and stir for 60 minutes.

[0057] 3. The suspension obtained in step ② is ultrasonically treated for 120 minutes with an ultrasonic power of 500W. Finally, it is allowed to stand at room temperature to obtain a nanocomposite fluid lubricant for hot-rolled steel strip.

[0058] The nanocomposite fluid hot-rolled strip steel rolling lubricant prepared in Examples 1-10 was tested for tribological properties using an MR-S10A four-ball friction and wear tester according to industry standard SH / T0762-2005. Table 2 shows the implementation technical effects of the products prepared in Examples 1-10.

[0059] Table 2. Technical Effects of the Products Obtained in Examples 1-10

[0060]

[0061]

[0062] 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 nanocomposite fluid lubricant for hot-rolled steel strip, characterized in that, The lubricant comprises the following components in the indicated mass percentages: 0.2–3.0 wt% of graphene oxide-coated TiO2 / MoS2 composite nanoparticles, 0.1–1.0 wt% of surfactant, 0.1–3.0 wt% of polymer, 0.5–2.0 wt% of polyether, 0.1–2.0 wt% of stabilizer, 0.05–2.0 wt% of antioxidant, 0.5–2.0 wt% of bactericide, 0.25–1.5 wt% of defoamer, 0.5–5.0 wt% of pH adjuster, with the balance being deionized water; The surfactant is composed of sodium dodecylbenzenesulfonate and sodium dodecyl sulfate, with a compound mass ratio of sodium dodecylbenzenesulfonate:sodium dodecyl sulfate = (1~2):1; the polymer is composed of polyvinyl alcohol and polyacrylamide, with a compound mass ratio of polyvinyl alcohol:polyacrylamide = 2:(2~3). The polyether is composed of polyethylene glycol and polyethylene oxide, with a compound mass ratio of polyethylene glycol: polyethylene oxide = 1:1; the stabilizer is polyvinylpyrrolidone. The antioxidant is composed of 2,6-di-tert-butyl-p-cresol and di-tert-butyl carbonate, with a compound mass ratio of 2,6-di-tert-butyl-p-cresol (BHT): di-tert-butyl carbonate = (1-2):1; the bactericide is composed of triclosan, benzoic acid and benzimidazole, with a compound mass ratio of triclosan: benzoic acid: benzimidazole = 1:(1-2):1; The preparation method of the above-mentioned nanocomposite fluid hot-rolled strip steel rolling lubricant includes the following steps: ① Add the graphene oxide-coated TiO2 / MoS2 composite nanoparticles, surfactants, polymers, polyethers, stabilizers, antioxidants, bactericides, defoamers, and pH adjusters to deionized water in proportion; ② Use a magnetic stirrer for stirring and heating. Heat the temperature to 75℃~85℃, adjust the stirring speed to 1200~1500 rpm, and stir for 45~60 minutes. ③The suspension obtained in step ② is ultrasonically treated for 90-120 minutes with an ultrasonic power of 450-500W, and then allowed to stand at room temperature to obtain a nanocomposite fluid hot-rolled strip steel rolling lubricant.

2. The rolling lubricant according to claim 1, characterized in that, The graphene oxide-coated TiO2 / MoS2 composite nanoparticles are composed of graphene oxide, MoS2 nanoparticles, and TiO2 nanoparticles, with a mass ratio of graphene oxide:MoS2 nanoparticles:TiO2 nanoparticles of (1-2):(1-2):

1. The preparation process includes the following steps: ① Disperse MoS2 nanoparticles in an organic solvent, sonicate for 45-60 minutes at an ultrasonic power of 500-600W, then add a surfactant and mix to obtain a MoS2 nanoparticle suspension. ② Disperse TiO2 nanoparticles in an organic solvent and sonicate them for 45–60 minutes at an ultrasonic power of 500–600 W to obtain a TiO2 nanoparticle suspension; ③ The TiO2 nanoparticle suspension is dropped into the MoS2 nanoparticle suspension, and a surfactant is added at the same time. The ultrasonic power is adjusted to 600-800W and heated to 80℃-85℃. The ultrasonic time is 60-90 minutes to obtain a suspension of TiO2 / MoS2 composite nanoparticles. ④ Add graphene oxide to the suspension obtained in step ③, adjust the ultrasonic power to 800-900W, heat to 85℃-90℃, and sonicate for 90-120 minutes to obtain a mixture; ⑤ Centrifuge the mixed solution obtained in step ④ for 30-45 minutes at a speed of 12,000-15,000 rpm, and redisperse the precipitate in ethanol to obtain a suspension; ⑥ Filter the suspension obtained in step ⑤. The filter membrane has a pore size of 0.2 to 0.5 μm. ⑦ Centrifuge the filtered suspension again for 45-60 minutes, adjusting the speed to 18,000-20,000 rpm. Wash and dry the obtained precipitate at 95℃-100℃ for 6-9 hours to finally obtain graphene oxide-coated TiO2 / MoS2 composite nanoparticles.

3. The rolling lubricant according to claim 1, characterized in that, The defoamer is composed of polydimethylsiloxane, defoamer SE-15, and defoamer Y-30, with a compounding ratio of polydimethylsiloxane: defoamer SE-15: defoamer Y-30 = 2:(2~3):2; the pH adjuster is composed of sodium hydroxide and ammonium hydroxide, with a compounding mass ratio of sodium hydroxide: ammonium hydroxide = 2:(2~3).

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