Anti-spot and anti-corrosion rolling oil as well as preparation method and use method thereof

Abstract

The invention relates to the technical field of metal rolling and rolling oil, and provides anti-spot and anti-corrosion rolling oil as well as a preparation method and a use method of the anti-spot and anti-corrosion rolling oil. 9 to 13 parts of synthetic ester; 2 to 3 parts of an antioxidant; 5-8 parts of an anti-wear reagent at extreme pressure; 2-3 parts of an antirust agent; 4-5 parts of an emulsifier; 0.7 to 1.2 parts of a bulking agent and 0.007 to 0.012 part of a nanometer self-lubricating agent; the base oil is mineral oil 150SN, castor oil and 500SN base oil, and based on the total mass of the base oil, the ratio of the mineral oil 150SN to the castor oil to the 500SN base oil in the base oil is (1.7-1.9): 1: (0.1-0.2); the compatibilizer is isopropyl palmitate and ethyl oleate, and the ratio of isopropyl palmitate to ethyl oleate is (3.4-5.4): 1 based on the total mass of the compatibilizer; the nanometer self-lubricating agent comprises nanometer molybdenum disulfide and nanometer silicon dioxide, and the ratio of the nanometer molybdenum disulfide to the nanometer silicon dioxide is 1: (1.4-1.5) according to the total mass of the nanometer self-lubricating agent. And spots and corrosion of the silicon steel in the cold rolling process are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal rolling and rolling oil, in particular to an anti-spot and anti-corrosion rolling oil, a preparation method and a use method. BACKGROUND

[0002] In the field of metal processing, especially in the cold rolling process, the lubrication and cooling capacity of the rolling oil has a crucial influence on the quality of metal processing.

[0003] Silicon steel is an extremely low-carbon silicon-iron alloy containing 0.5-6.5% silicon, mainly used for the cores of various motors, generators, compressors, motors and transformers, and is an indispensable raw material product in the power and home appliance industries. The addition of silicon significantly increases the hardness and deformation resistance of steel, resulting in increased friction and rolling force during cold rolling, which easily causes surface stress concentration and forms micro-cracks or scratches. These defects can become the starting point for subsequent oxidation or corrosion. High silicon content (especially 3-6.5% high silicon steel) of silicon steel promotes the preferential oxidation of silicon, forming a loose SiO2 oxide film, and its porous and loose structure accelerates the penetration of oxygen and water, accelerating corrosion; if the rolling oil performance is poor, the oil carbonizes at high temperature, reacts with the metal to form a hard oxide skin, and rust, etc., making it difficult to completely remove the acid pickling after rolling, forming spots. Therefore, silicon steel with high silicon content is more prone to spot and corrosion problems during cold rolling, affecting the plate surface quality and leading to a decrease in product qualification rate, and the lubricity, anti-spot property, cooling property, detergency, rust prevention, oxidation resistance, stability and environmental friendliness of the silicon steel cold rolling oil are more strictly required.

[0004] Therefore, it is necessary to develop an anti-spot and anti-corrosion rolling oil, and to provide a more optimal preparation and use method for the anti-spot and anti-corrosion rolling oil, so as to effectively solve the problem of spot and corrosion of silicon steel with high silicon content during cold rolling. SUMMARY

[0005] To overcome the shortcomings of the prior art, the present application provides an anti-spot and anti-corrosion rolling oil, a preparation method and a use method, which avoid the occurrence of spots and corrosion of silicon steel during cold rolling.

[0006] The embodiments of the present application are implemented as follows:

[0007] In the first aspect, the present application provides an anti-spot and anti-corrosion rolling oil, which comprises the following components in parts by mass: base oil: 80-85 parts; synthetic ester: 9-13 parts; antioxidant: 2-3 parts; extreme pressure anti-wear agent: 5-8 parts; rust inhibitor: 2-3 parts; emulsifier: 4-5 parts; compatibilizer 0.7-1.2 parts, nano self-lubricant 0.007-0.012 parts; the base oil is mineral oil 150SN, castor oil and 500SN base oil, with the total base oil being 100-150 parts. Calculated by mass, the ratio of mineral oil 150SN: castor oil: 500SN base oil in the base oil is (1.7-1.9):1:(0.1-0.2); the compatibilizers are isopropyl palmitate and ethyl oleate, and based on the total mass of the compatibilizers, the ratio of isopropyl palmitate: ethyl oleate is 3.4-5.4:1; the nano self-lubricant is nano molybdenum disulfide and nano silicon dioxide, and based on the total mass of the nano self-lubricant, the ratio of nano molybdenum disulfide: nano silicon dioxide is 1:(1.4-1.5).

[0008] Alternatively, the synthetic ester is trimethylolpropane cocoate.

[0009] Optionally, the emulsifier is fatty alcohol polyoxyethylene ether fatty acid ester and alkylphenol polyoxyethylene ether.

[0010] Optionally, based on the total mass of the emulsifier, the ratio of fatty alcohol polyoxyethylene ether fatty acid ester: alkylphenol polyoxyethylene ether is 1.5-1.7:1.

[0011] Optionally, the antioxidant may be one or more of an amine antioxidant and a phenolic antioxidant.

[0012] Optionally, the extreme pressure anti-wear agent is sulfided fatty acid methyl ester: oleyl phosphate: molybdenum dithiophosphate, and based on the total mass of the extreme pressure anti-wear agent, the sulfided fatty acid methyl ester: oleyl phosphate: molybdenum dithiophosphate is 1: (1.5-1.7): (1.1-1.3).

[0013] Optionally, the rust inhibitor is dodecenylsuccinic acid.

[0014] In a second aspect, the present application provides an example of a method for preparing an anti-spot and anti-corrosion rolling oil. The method comprises: S1, a pre-dispersion step, wherein castor oil and ethyl oleate are mixed to form a premixed liquid, mineral oils 150SN and 500SN, and isopropyl palmitate are added to a container and mixed, and then the premixed liquid is slowly added; stirring at 60-70°C until the solution is clear, and then adding a nano self-lubricant and using ultrasonic dispersion and mixing, with an ultrasonic frequency of 40-60kHz and an ultrasonic power of 730-860W;

[0015] S2. Add antioxidant, synthetic ester, emulsifier, extreme pressure anti-wear agent and rust inhibitor in sequence, at a temperature of 50-57°C, perform ultrasonic dispersion with mechanical stirring, ultrasonic frequency of 61-75kHz, ultrasonic power of 730-860W, to obtain anti-spot and anti-corrosion rolling oil.

[0016] In a third aspect, the present application provides an example of a method for using an anti-spot and anti-corrosion rolling oil, wherein the method for preparing the anti-spot and anti-corrosion rolling oil is used to prepare the anti-spot and anti-corrosion rolling oil, and the method comprises:

[0017] S1. preparing the anti-spot and anti-corrosion rolling oil into an emulsion in which the mass of the anti-spot and anti-corrosion rolling oil accounts for 0.5-3%;

[0018] S2. Prepare a silicon steel strip with a silicon content of 2.5%-5%, and use a five-stand six-roller cold rolling mill for continuous rolling. The continuous rolling process includes: the surface roughness of the rolls of the 1st-2nd stands is 1.1-1.2 μm, the reduction rate of the first two passes is 35-39%, the mass concentration of the emulsion is 1.5-3%, and the flow rate of the emulsion is 5200-5800 L / min; the surface roughness of the rolls of the 3rd-5th stands is 0.1-0.3 μm; the mass concentration of the emulsion is 0.5-1.5%, and the flow rate of the emulsion is 7300-8500 L / min.

[0019] Optionally, the unit tension between the first and second racks is 150-160N / mm 2 The unit tension between the second and third frames is 160-180N / mm 2 The unit tension between the 3rd and 4th frames is 190-200N / mm 2 The unit tension between the 4th and 5th racks is 210-220N / mm 2 .

[0020] Beneficial effects include:

[0021] The anti-spot and anti-corrosion rolling oil provided by the present invention maintains a stable lubricating film through mineral oil 150SN, reducing direct friction between the rolls and silicon steel. Its medium viscosity helps control the uniform distribution of rolling pressure, reducing surface stress concentration and the potential for microcracks or scratches. The combination of castor oil and mineral oil 150SN enables the base oil to have variable kinematic viscosity before and after entering the deformation zone. The kinematic viscosity decreases in the high-temperature zone of the deformation zone, helping to control the uniform distribution of rolling pressure in the rolling oil system at high temperatures and improving the surface uniformity of rolled silicon steel. Prior to rolling in the high-temperature deformation zone, the viscosity increases appropriately, increasing the thickness of the oil film and improving lubricity. This prevents damage to the silicon steel surface caused by film defects and helps reduce the starting points of oxidation or corrosion. The addition of a small amount of 500SN base oil can make the rolling oil have better rolling stability to withstand high pressure by appropriately increasing the viscosity when the silicon steel is harder and less prone to deformation, and improve the stability of the lubricating film at high temperature (high flash point) and high pressure (greater viscosity, reduced fluidity and better stable film-forming ability). The combination of the three can reduce the direct friction between the roll and the silicon steel, increase the film stability and appropriately increase the film thickness, reduce surface stress concentration, and reduce the possibility of forming microcracks or scratches, thereby improving corrosion resistance and reducing rust.

[0022] The molecular size of isopropyl palmitate is between that of mineral oil and castor oil, and it can fill the molecular gap between the two. Ethyl oleate has a stronger polarity compatibilizing ability than isopropyl palmitate, especially better binding ability with castor oil, which helps to reduce the separation between castor oil and 500SN base oil, and helps to improve the compatibility between mineral oil 150SN, 500SN base oil and castor oil.

[0023] Nano-molybdenum disulfide reduces local high-temperature oxidation and microcracks caused by frictional heat, reduces wear, and acts as a self-lubricant. Its lamellar structure is more conducive to forming a covering film that tightly covers the surface of silicon steel, which can help it fill the tiny pores and defects on the surface of silicon steel, forming a dense and continuous adsorption film, delaying the corrosion process, improving corrosion resistance, and reducing rust.

[0024] Nano-silica particles have a strong affinity with silicon oxides on the surface of silicon steel, which helps them penetrate into the micro-cracks and pores on the surface of silicon steel, forming a physical barrier to block the intrusion of corrosive media such as moisture, oxygen and Cl-, reducing the risk of pitting corrosion, and helping to improve corrosion resistance and reduce rust.

[0025] By stirring the base oil at a higher temperature, the mixing effect of base oils with different polarities is improved; the nano-lubricant is dispersed using low-frequency, high-power ultrasonic waves, which helps to improve the dispersion of the nano-lubricant and reduce agglomeration. By lowering the mixing temperature, the impact of high temperature on the system is reduced; by adding synthetic esters and emulsifiers, the mixing is further improved at a lower temperature to prevent stratification; by increasing the ultrasonic dispersion frequency, the dispersion effect of nanoparticles is improved when the viscosity of the dispersion system is relatively low and the mixing time is long.

[0026] By increasing the surface roughness of the rolls in stands 1-2 and combining them with a high-concentration emulsion, a thicker lubricating film is formed, increasing deformation capacity in the early stages and facilitating a reduction in reduction rate in the later stages, reducing cooling and lubrication requirements, and reducing emulsion usage, thereby reducing staining and improving corrosion resistance. Stands 3-5 utilize a low-surface-roughness roll to reduce frictional heat generation as the thickness of the silicon steel strip decreases, significantly reducing the proportion of rolling oil used. Using an emulsion with a low rolling oil content and significantly increasing the emulsion flow rate enhances cooling and improves the removal of impurities during the rolling process, reducing the possibility of staining and avoiding corrosion. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless specifically defined as herein, will not be interpreted in an idealized or overly formal sense. The reagents used herein may be commercially available products, and performance test standards may refer to industry or national standards.

[0029] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a," "an," "said," and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0030] Silicon steel has a high silicon content and is more susceptible to staining and rusting during the cold rolling process. The present invention provides an anti-stain and anti-corrosion rolling oil, a preparation method, and a use method.

[0031] Exemplarily, an anti-spot and anti-corrosion rolling oil is provided, which comprises the following components in parts by mass:

[0032] Base oil: 80-85 parts; synthetic ester: 9-13 parts; antioxidant: 2-3 parts; extreme pressure anti-wear agent: 5-8 parts; rust inhibitor: 2-3 parts; emulsifier: 4-5 parts; compatibilizer 0.7-1.2 parts, nano self-lubricant 0.007-0.012 parts.

[0033] Synthetic ester and base oil are used as carriers to ensure basic lubrication and cooling effects. The base oil, the main component of anti-spot and anti-corrosion rolling oil, plays a fundamental role in ensuring the quality stability and performance of the oil. However, the existing rolling oil uses a single mineral oil base, and the biodegradability of mineral oil is poor, which limits the environmental performance of the lubricant. At the same time, mineral oil has poor miscibility with other additives, and is easy to stratify or form an uneven emulsion, making it difficult to form a stable boundary lubrication film. The friction coefficient and cooling performance fluctuate greatly during the rolling process, which is more likely to cause stains and rust problems on silicon steel during the cold rolling process. Plant oil-based lubricants have the advantages of being renewable, non-toxic, biodegradable, as well as stable, antioxidant and anti-wear properties. Selecting suitable plant-based oils in combination with mineral-based oils can effectively improve the performance of the base oil.

[0034] Base oil: 80-85 parts (optional: 80, 81, 82, 83, 84, 85, etc.); base oil includes a type of mineral oil 150SN. 150SN base oil is refined through a hydrogenation process in the presence of high-pressure hydrogen and a catalyst from crude oil. It has good viscosity-temperature characteristics, low evaporation loss, excellent low-temperature fluidity, good oxidation stability, anti-emulsification and air release properties. Mineral oil 150SN has a high flash point (greater than 180°C) and medium viscosity (kinematic viscosity of about 30-40mm 2 / s), can maintain a stable lubricating film and reduce direct friction between the rolls and silicon steel when rolling high temperature occurs when excessive silicon addition to silicon steel leads to increased friction and rolling force during cold rolling. Its medium viscosity helps to control the uniform distribution of rolling pressure, reduce surface stress concentration, and the possibility of forming microcracks or scratches, which is beneficial to reduce the starting point of oxidation or corrosion, improve the surface uniformity of silicon steel after rolling, enhance corrosion resistance, and reduce spots.

[0035] The base oil also includes castor oil. Castor oil molecules contain polar hydroxyl groups and unsaturated bonds, which are more likely to be adsorbed on the surface of silicon steel to form a dense lubricating film, reducing friction heat and surface microcracks during rolling, thereby helping to inhibit the formation of oxide scale (the source of stains). Castor oil has a high kinematic viscosity at low temperatures (such as 20-30°C), which can reach 300mm. 2 / s, at high temperatures (above 100 ° C), the kinematic viscosity can drop sharply to 75mm 2 A medium viscosity below 0.1 / s provides a strong oil film with strong shear resistance in the rolling deformation zone, allowing it to withstand higher pressures. The thicker the oil film in the deformation zone, the thicker it becomes as the kinematic viscosity of the rolling oil increases. Therefore, the combination of castor oil and mineral oil 150SN allows the base oil's kinematic viscosity to be variable before and after entering the deformation zone, decreasing in the high-temperature zone. This helps control the uniform distribution of rolling pressure within the rolling oil system at high temperatures and improves the surface uniformity of rolled silicon steel. Before entering the high-temperature deformation zone, the viscosity is appropriately increased, increasing the thickness of the oil film and enhancing lubricity. This prevents damage to the silicon steel surface caused by film defects, helps reduce the initiation points of oxidation or corrosion, improves surface uniformity after rolling, enhances corrosion resistance, and reduces staining. Furthermore, castor oil exhibits excellent hydrolytic stability, reducing the acid value of the rolling oil emulsion formed during acid hydrolysis, which can cause corrosion to the silicon steel surface. Ricinoleic acid, the primary fatty acid in castor oil (comprising over 80%), not only imparts its oily properties but also possesses antioxidant properties. It contains vitamin E, polyphenols, and flavonoids, which possess significant antioxidant capacity. When compounded with mineral oil, ricinoleic acid enhances the base oil's antioxidant capacity, reducing the formation of oxidized colloids and the risk of staining on silicon steel surfaces. Compared to other vegetable oils (coconut oil, soybean oil, etc.) used in existing technologies, castor oil is more suitable for silicon steel rolling. Using it as a base oil and increasing its usage ratio can help fully utilize its corrosion and stain-reducing properties during silicon steel rolling.

[0036] The base oil also includes 500SN base oil, which has a kinematic viscosity (40°C) of 96 to 100 mm 2 / s, kinematic viscosity (100℃), 11~11.5mm 2 / s, flash point (open), 242°C. This is a higher-grade, highly stable base oil. When added in small amounts during the silicon steel rolling process, it can be used to treat high temperatures generated by rolling when excessive silicon addition to the silicon steel leads to increased friction and rolling forces during cold rolling, i.e., when the silicon steel becomes harder and less prone to deformation. By appropriately increasing viscosity, the rolling oil can possess better rolling stability to withstand high pressures, improving the lubricating film's stability under high temperatures (higher flash point) and high pressures (greater viscosity, reduced fluidity, and improved film-forming stability), further reducing direct friction between the rolls and the silicon steel. By increasing film stability and appropriately increasing film thickness, surface stress concentration is further reduced, potentially leading to the formation of microcracks or scratches. This helps reduce the starting points of oxidation or corrosion, improves the surface uniformity of the rolled silicon steel, enhances corrosion resistance, and reduces staining. At the same time, given the susceptibility of silicon steel to corrosion and rust, increasing the amount of base oil helps form a thicker and more stable oil film, thereby improving corrosion resistance and reducing rust. In addition, mineral oil 150SN and other base oil systems are relatively mature and stable, and their characteristics are more fully understood. Adjusting the viscosity and high-temperature and high-pressure capabilities through 500SN base oil can also help reduce R&D costs.

[0037] Calculated based on the total mass of base oil, the base oil ratio of mineral oil 150SN: castor oil: 500SN is (1.7-1.9):1:(0.1-0.2) (optional are 1.7:1:0.1, 1.7:1:0.2, 1.8:1:0.1, 1.8:1:0.2, 1.9:1:0.1, 1.9:1:0.2, etc.). Mineral oil 150SN is low in cost, castor oil is widely available and is also a relatively low-cost oil product. 500SN is relatively expensive but has better performance. The combination of the three is beneficial to the cost control of rolling oil. Furthermore, a high ratio of mineral oil 150SN to castor oil ensures a moderate kinematic viscosity in the base oil blend, facilitating control of oil film thickness and ensuring stable lubrication under high pressure and temperature. This helps evenly distribute rolling pressure, improves rolling oil distribution, reduces surface stress concentrations that can lead to microcracks or scratches, and reduces the initiation points of oxidation or corrosion, further enhancing corrosion resistance and reducing staining. Using a small ratio of 500SN improves high-pressure resistance, film thickness, and stability while avoiding the adverse effects of an excessively high ratio, such as increased costs and insufficient fluidity and uneven dispersion. Within the above ratios, the castor oil ratio should be kept within a reasonable range to avoid excessive lubricity, which can lead to insufficient rolling force. Furthermore, an excessively high ratio of mineral oil 150SN should be avoided, as the base oil's kinematic viscosity changes minimally before and after entering the deformation zone, hindering uniform distribution of rolling pressure and improving rolling uniformity while also reducing biodegradability.

[0038] Synthetic ester: 9-13 parts (optional: 9, 10, 11, 12, 13, etc.). The synthetic ester is trimethylolpropane cocoate, which has a wide liquid temperature range, excellent lubrication performance, high viscosity index, excellent thermal stability, low volatility, low temperature performance, etc. For example: trimethylolpropane cocoate is an ester of trimethylolpropane and coconut oil fatty acids. Its structure contains three hydroxyl groups and one oleic acid group. This structure gives it good hydrophilicity and lubricity, which is beneficial to improving the emulsification performance of rolling oil and the stability of emulsion; trimethylolpropane cocoate has a strong affinity for metals. Its working principle is to adsorb on the friction surface through polar groups and form a molecular directional adsorption film, which can prevent direct contact between metals, thereby further reducing friction and wear, and improving the strength of the oil film. Viscosity 40℃: 30-40 (mm 2 / s); 100℃: 7-9(mm 2 / s), which is more suitable for silicon steel rolling under high pressure. It can enhance the kinematic viscosity of the rolling oil before and after entering the deformation zone, and the kinematic viscosity becomes smaller in the high-temperature zone of the deformation zone, which helps to control the uniform distribution of the rolling pressure of the rolling oil system at high temperature, improve the uniformity of the rolling oil distribution, reduce surface stress concentration, and the possibility of forming microcracks or scratches, which is beneficial to reduce the starting point of oxidation or corrosion, improve corrosion resistance, and reduce spots. Trimethylolpropane cocoate and ricinoleic acid glyceride, the main component of castor oil, are closer in chemical structure and polarity and have good compatibility, which enables the two to be evenly mixed and not easily stratified. In addition, by utilizing its hydrophilicity and using trimethylolpropane cocoate in an appropriate proportion, trimethylolpropane cocoate is better compatible with castor oil, which can improve compatibility with base oil, and is beneficial to improving the emulsification properties and stability of the emulsion configured into the anti-spot and anti-corrosion rolling oil, thereby obtaining suitable water-free spreading properties, which is beneficial to improving film formation and lubricity, and is also beneficial to improving the thermal conductivity of the emulsion when the anti-spot and anti-corrosion rolling oil is rolled under high pressure, reducing the risks of increased corrosion and silicon oxidation at high temperatures.

[0039] The compatibilizer is 0.7-1.2 parts (optional is 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, etc.), which are isopropyl palmitate and ethyl oleate. Mineral oil 150SN and 500SN base oils: non-polar, castor oil is of medium polarity. The difference in polarity makes the three tend to stratify when mixed, especially between 500SN base oil and castor oil. By adding isopropyl palmitate with medium polarity, it can form a good interaction with the non-polar mineral oil 150SN, 500SN base oil and medium polar castor oil, acting as a "bridge". Isopropyl palmitate is an ester compound, similar to the ester structure of castor oil. At the same time, its non-polar alkyl chain is compatible with the hydrocarbon structure of mineral oil 150SN and 500SN base oils. Isopropyl palmitate, with a molecular size between that of mineral oil and castor oil, can fill the molecular gaps between them, improving mixing uniformity. The addition of a compatibilizer promotes compatibility among rolling oil system components, facilitating the formation of a stable emulsion. This avoids uneven stratification of the emulsion, which can lead to differences in cooling, lubrication, and thermal conductivity on the silicon steel surface, and consequently, reduced corrosion and anti-staining properties. Ethyl oleate, also serves as a "bridge," possessing an ester group (-COO-) and a C18 unsaturated alkyl chain. It exhibits stronger polar compatibilization than isopropyl palmitate, particularly with castor oil, which helps reduce the separation between castor oil and 500SN base oil and improves the compatibility between mineral oils 150SN and 500SN and castor oil. Based on the total mass of the compatibilizer, the ratio of isopropyl palmitate to ethyl oleate is 3.4-5.4:1. Isopropyl palmitate has better low-temperature fluidity and moderate compatibility-promoting ability. By adding a small amount of ethyl oleate, the separation between castor oil and 500SN base oil is reduced, which is beneficial to enhancing the solubilization effect of the compatibilizer and further improving the mixing uniformity of the base oil system.

[0040] Emulsifier: 4-5 parts. Taking into account the biodegradability of the emulsifier and its impact on lubrication and rust prevention properties, high molecular weight fatty alcohol polyoxyethylene ether fatty acid esters were selected as emulsifiers. The polarity differences between 150SN mineral oil, 500SN base oil (non-polar), castor oil (medium polarity) and trimethylolpropane cocoate (medium polarity) may lead to compatibility issues. The emulsifier, through its amphiphilic structure (hydrophilic head (polyoxyethylene chain) and lipophilic tail (long-chain fatty alcohol or fatty acid portion)), can bridge oil phases of different polarities and improve overall compatibility. Fatty alcohol polyoxyethylene ether fatty acid esters can be adsorbed on the oil phase interface, reducing the interfacial tension between 150SN mineral oil, 500SN base oil and castor oil and trimethylolpropane cocoate. The reduction in interfacial tension makes it easier for oil phases of different polarities to mix, reducing the possibility of stratification or precipitation. This emulsifier evenly disperses the components, preventing localized concentrations of the emulsion from being too high or too low, which can lead to deviations in lubrication and thermal conductivity. This also increases the risk of uneven rolling force distribution during cold rolling, which is more common due to the high hardness, difficulty in deformation, and susceptibility to oxidation of silicon steel. This provides superior emulsification, helping to reduce uneven distribution of rolling oil. Furthermore, at normal operating temperatures, the agent exhibits linear molecules with good emulsification properties. However, upon entering high-temperature and high-pressure zones, the molecular chains shrink into clusters, losing their emulsification capacity and prompting rapid separation of oil and water, which spreads across the surface of the silicon steel, increasing its film-forming speed and film strength, thereby improving the lubricity of the rolling oil. This facilitates the formation of an oil film on the surface of silicon steel, which generates high heat during high-pressure rolling. This improves lubrication and protection of the silicon steel surface, reduces silicon oxidation, and reduces problems such as staining and rust.

[0041] The emulsifier also includes TX-10 (alkylphenol polyoxyethylene ether). TX-10 shares the same hydrophilic head (polyoxyethylene chain) as fatty alcohol polyoxyethylene ether fatty acid esters and performs the same function. The lipophilic tail (long-chain fatty alcohol or fatty acid moiety) of fatty alcohol polyoxyethylene ether fatty acid esters is more suitable for interaction with non-polar 150SN and 500SN. The lipophilic tail of TX-10 (alkylphenol polyoxyethylene ether) includes an alkylphenol moiety, which has a stronger affinity for moderately polar castor oil and trimethylolpropane cocoate. The addition of TX-10 (alkylphenol polyoxyethylene ether) to the fatty alcohol polyoxyethylene ether fatty acid esters complements and enhances the emulsifier's interaction with 150SN and 500SN mineral oils, castor oil, and trimethylolpropane cocoate, synergistically improving emulsification performance. Fatty alcohol polyoxyethylene ether fatty acid esters and TX-10 co-adsorb at the oil-water interface, further reducing interfacial tension and facilitating the formation of a stable emulsion between the oil and water phases. The combination of fatty alcohol polyoxyethylene ether fatty acid ester and TX-10 can enhance the steric hindrance effect of the emulsion, prevent droplet aggregation and stratification, and also improve the shear resistance and temperature stability of the emulsion, improve the extreme pressure performance, make it more suitable for silicon steel rolling process under high pressure conditions, have more stable performance, and maintain the integrity of the lubricating film.

[0042] Based on the total mass of emulsifier, the ratio of fatty alcohol polyoxyethylene ether fatty acid ester: TX-10 is 1.5-1.7:1; further increasing the dosage ratio of fatty alcohol polyoxyethylene ether fatty acid ester is conducive to matching with a high proportion of 150SN and 500SN mineral oils to increase its film formation speed and oil film strength, thereby giving full play to the emulsification effect of each emulsifier.

[0043] Antioxidant: 2-3 parts; the antioxidant can be one or more of an amine antioxidant or a phenolic antioxidant, with no specific limitations. Examples include diphenylamine (DPA), p-phenylenediamine (PPD), alkylated diphenylamine, dodecenylsuccinamide, 2,6-di-tert-butyl-p-cresol (BHT), 2,6-di-tert-butylphenol (DBPC), and alkylbiscyclohexylcresols. These antioxidants inhibit oxidation reactions by capturing free radicals and decomposing peroxides.

[0044] Extreme pressure anti-wear agent: 5-8 parts (optional: 5, 6, 7, 8, etc.); extreme pressure agents are primarily used to protect metal surfaces from wear, scratches, and sintering under conditions of extreme pressure, high temperature, and high load. Sulfurized fatty acid methyl ester (such as model YD-3015) adsorbs onto silicon steel surfaces to form a sulfide-based extreme pressure film and is highly biodegradable. Oleyl alcohol phosphate (CAS 37310-83-1) reduces friction and wear under conditions of boundary lubrication caused by high loads. Molybdenum dithiophosphate (MoDTP) decomposes peroxides (ROOH) generated during rolling oil oxidation, preventing further decomposition into free radicals and thus interrupting the oxidation chain reaction, providing excellent antioxidant properties. By combining these three extreme pressure anti-wear agents in a specific ratio and increasing their dosage, a strong extreme pressure-resistant oil film can be quickly formed on the rolled steel surface under high temperature and high pressure during silicon steel rolling lubrication. This effectively ensures lubricity during the rolling process, reduces microcracks and scratches, and improves corrosion and spot resistance. Optionally, based on the total mass of the extreme pressure anti-wear agent, the ratio of sulfided fatty acid methyl ester: oleyl phosphate: molybdenum dithiophosphate is 1: (1.5-1.7): (1.1-1.3). Silicon steel is more prone to cracks and scratches. Increasing the proportion of oleyl phosphate can provide better friction and wear reduction capabilities, have antioxidant properties, take into account biodegradability, have excellent high pressure resistance, and help improve corrosion resistance and anti-staining capabilities.

[0045] Rust inhibitor: 2-3 parts; alkylamine, cyclohexylamine, benzotriazole (BTA), dodecenylsuccinic acid, stearic acid, etc. can be selected, with dodecenylsuccinic acid being preferred. The carboxylic acid group reacts with Fe to form a stable oxide film (FeCOO-), which inhibits the anodic reaction. The carboxylic acid polar group combines with the castor oil hydroxyl group to enhance the density of the mixed oil film, thereby reducing silicon steel surface oxidation and improving corrosion resistance and spot resistance.

[0046] Nano self-lubricant 0.007-0.012 parts (optionally 0.007, 0.008, 0.009, 0.010, 0.011, 0.012, etc.); including: nano molybdenum disulfide and nano silicon dioxide; optionally nano molybdenum disulfide (for example: brand Shanghai Cora Man Reagent Co., Ltd., particle size 20nm-500nm, small piece diameter single layer molybdenum disulfide nanosheet powder); nano molybdenum disulfide is a two-dimensional material composed of molybdenum and sulfur atoms, which is combined between layers by weak van der Waals force, has a low friction coefficient, reduces local high-temperature oxidation and micro-cracks caused by friction heat, reduces wear, plays a self-lubricating role, thereby reducing scratches on the surface of silicon steel and reducing rolling stress unevenness; due to the lamellar structure of nano molybdenum disulfide, it is more conducive to forming a covering film that tightly covers the surface of silicon steel, which can help fill the small pores and defects on the surface of silicon steel and form a dense and continuous adsorption film that blocks the penetration of water, oxygen and Cl - corrosion medium, inhibits the initiation of electrochemical corrosion, the semiconductor properties of MoS2 form a micro-cathode area on the metal surface, reduce the local anode reaction rate (Fe→Fe 2+ +2e - ), delay the corrosion process, improve corrosion resistance and reduce rust spots.

[0047] Nano silicon dioxide has strong affinity with silicon in silicon steel, and the surface of silicon steel with high silicon content may have residual silicon oxide or new silicon oxide, nano silicon dioxide particles (particle size 10-50nm, for example, Suzhou Yuzhu Nanometer Material Co., Ltd., average particle size 15nm, model UG-SP15F) have strong affinity with silicon oxide on the surface of silicon steel, which is conducive to its penetration into the micro-cracks and pores on the surface of silicon steel, forming a physical barrier to block the invasion of water, oxygen and Cl- and other corrosion media, reducing the risk of pitting corrosion, improving corrosion resistance and reducing rust spots. The ratio of nano molybdenum disulfide to nano silicon dioxide is 1:(1.4-1.5) based on the total mass of nano self-lubricant; using more nano silicon dioxide reduces pitting corrosion, while taking into account lubrication and barrier effect, reducing new oxidation, scratches, etc., improving corrosion resistance and reducing rust spots.

[0048] A method for preparing an anti-spot and anti-corrosion rolling oil is provided for the above anti-spot and anti-corrosion rolling oil, which comprises:

[0049] S1, pre-dispersion step, castor oil and ethyl oleate are mixed to form a premixed liquid, mineral oil 150SN, 500SN and isopropyl palmitate are added to the container and mixed, and then the premixed liquid is slowly added, and different compatibilizers are mixed and added respectively to avoid stratification caused by local polarity differences; stirring at 60-70°C (optionally 60°C, 63°C, 64°C, 66°C, 68°C, 70°C, etc.) until the solution is clarified, and then the nano self-lubricant is added and ultrasonic dispersion is adopted, the ultrasonic frequency is 40-60kHz (optionally 40kHz, 45kHz, 49kHz, 54kHz, 57kHz, 60kHz, etc.), and the ultrasonic power is 730-860W; by stirring the base oil at a higher temperature, the mixing effect of the base oil with different polarities is improved; the nano self-lubricant is dispersed by low-frequency and high-power ultrasonic wave, which is beneficial to improve the dispersion of the nano self-lubricant and reduce agglomeration.

[0050] S2. Add antioxidant, synthetic ester, emulsifier, extreme pressure anti-wear agent, and rust inhibitor in sequence, at a temperature of 50-57°C (optionally 50°C, 51°C, 52°C, 53°C, 54°C, 57°C, etc.), ultrasonic dispersion combined with mechanical stirring, an ultrasonic frequency of 61-75kHz (optionally 61kHz, 65kHz, 71kHz, 72kHz, 74kHz, 75kHz, etc.), and an ultrasonic power of 730-860W, thereby obtaining an anti-spot and anti-corrosion rolling oil. By adding antioxidants in advance, the stability and antioxidant capacity of the rolling oil system are improved, and by lowering the mixing temperature, the impact of high temperature on the system is reduced; by adding synthetic esters, emulsifiers, etc., the mixing is further improved at a lower temperature to prevent stratification; by increasing the ultrasonic dispersion frequency, it is beneficial to improve the dispersion effect of nanoparticles under relatively low viscosity of the dispersion system and long-term mixing.

[0051] In view of the above anti-spot and anti-corrosion rolling oil, a method for using the anti-spot and anti-corrosion rolling oil is provided, the method comprising:

[0052] S1. preparing the anti-spot and anti-corrosion rolling oil into an emulsion in which the mass of the anti-spot and anti-corrosion rolling oil accounts for 0.5-3%;

[0053] S2. Prepare a silicon steel strip with a silicon content of 2.5%-5%, and use a five-stand six-roller cold rolling mill for continuous rolling, wherein the continuous rolling process includes: the surface roughness of the rolls of the 1st and 2nd stands is 1.1-1.2 μm (it can be understood that the roughness refers to the average roughness, the same below), the reduction rate of the first two passes is 35-39% (optionally 35%, 36%, 37%, 38%, 39%, etc.), the mass concentration of the emulsion is 1.5-3% (referring to an emulsion in which the mass of anti-spot and anti-corrosion rolling oil accounts for 1.5-3%), and the emulsion is 1.5-3%. The flow rate of the emulsion is 5200-5800L / min; the surface roughness of the rollers of the 1st and 2nd stands is improved, and the combination with high-concentration emulsion is conducive to forming a thicker lubricating film, extending the duration of the oil film, reducing the risk of roller wear and thermal scratches, and forming better lubrication and cooling effects. It is more conducive to achieving large reduction rates and large deformations in the first two stands, increasing the deformation capacity in the early stage, and helping to reduce the reduction rate in the later stage, reducing the fluctuation of the rolling force in the later stage, thereby reducing the demand for cooling and lubrication, reducing the amount of emulsion used, and helping to reduce spots and improve corrosion resistance.

[0054] The surface roughness of the rolls in stands 3-5 is 0.1-0.3 μm (optionally 0.1 μm, 0.2 μm, 0.3 μm, etc.); the emulsion concentration is 0.5-1.5% (preferably 0.6-0.8%, with options of 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.1%, 1.3%, 1.5%, etc.), and the emulsion flow rate is 7300-8500 L / min. The low roll surface roughness in stands 3-5 helps reduce frictional heat generation as the thickness of the silicon steel strip decreases, significantly reducing the proportion of rolling oil used. The use of an emulsion with a low rolling oil content, while significantly increasing the emulsion flow rate, enhances cooling and improves the removal of impurities during the rolling process, reducing the possibility of staining and avoiding corrosion.

[0055] Furthermore, the unit tension between the first frame and the second frame is 150-160N / mm 2 The unit tension between the second and third frames is 160-180N / mm 2 The unit tension between the 3rd and 4th frames is 190-200N / mm 2 The unit tension between the 4th and 5th racks is 210-220N / mm 2 Along the rolling direction of the silicon steel strip, as the reduction rate of the cold rolling mill gradually decreases, the unit tension gradually increases, which can reduce local stress concentration, reduce the occurrence of micro cracks, etc., and help reduce the occurrence of spots.

[0056] The features and performance of the present invention are further described in detail below with reference to the embodiments:

[0057] Example 1

[0058] A kind of anti-spotting anti-corrosion rolling oil, by mass parts, is prepared from the following components:

[0059] Base oil (base oil is mineral oil 150SN, castor oil and 500SN base oil, the mass of total base oil, mineral oil 150SN: castor oil: 500SN base oil in base oil is 1.8:1:0.2):83 parts; Synthetic ester (trimethylolpropane cocoate):11 parts; Antioxidant (p-phenylenediamine (PPD)):3 parts; Extreme pressure anti-wear agent (sulfurized fatty acid methyl ester: oleyl phosphate: molybdenum dithiophosphate, the total mass of extreme pressure anti-wear agent, sulfurized fatty acid methyl ester: oleyl phosphate: molybdenum dithiophosphate is 1:1.6:1.2):7 parts; Anti-rust agent (dodecenyl succinic acid):3 parts; Emulsifier (fatty alcohol polyoxyethylene ether fatty acid ester and TX-10, the total mass of emulsifier, fatty alcohol polyoxyethylene ether fatty acid ester: TX-10 is 1.5-1.7:1):5 parts; Compatibilizer (isopropyl palmitate and ethyl oleate, the total mass of compatibilizer, isopropyl palmitate: ethyl oleate is 4.3:1)1.1 parts, nano self-lubricating agent (nano molybdenum disulfide and nano silicon dioxide, the total mass of nano self-lubricating agent, nano molybdenum disulfide: nano silicon dioxide is 1:1.4)0.009 parts.

[0060] A method for preparing an anti-spotting anti-corrosion rolling oil, the anti-spotting anti-corrosion rolling oil is prepared, and the component ratio is according to the foregoing proportion;

[0061] The method comprises:

[0062] S1, a pre-dispersion step, castor oil is mixed with ethyl oleate to form a premix, mineral oil 150SN, 500SN and isopropyl palmitate are added to a container and mixed, then the premix is slowly added, and stirring is carried out at 67 DEG C until the solution is clear, then the nano self-lubricating agent is added and dispersed by ultrasonic wave, the ultrasonic frequency is 48 kHz, and the ultrasonic power is 810 W.

[0063] S2, the antioxidant, the synthetic ester, the emulsifier, the extreme pressure anti-wear agent and the anti-rust agent are added in sequence, and ultrasonic wave dispersion is combined with mechanical stirring at a temperature of 52 DEG C, the ultrasonic frequency is 72 kHz, and the ultrasonic power is 850 W, so that the anti-spotting anti-corrosion rolling oil is obtained.

[0064] Performance test method:

[0065] Subject: Anti-spot and anti-corrosion rolling oils and their emulsions from the Examples and Comparative Examples (the mass ratio of the anti-spot and anti-corrosion rolling oil in the emulsion was 2%). Viscosity at 40°C was tested according to GB / T 265, and saponification value was tested according to GB / T8021-2003. Emulsion stability: Emulsion stability index (ESI, %) was tested according to petrochemical industry standard SH / T 0579-1994 to evaluate the emulsification properties of cold rolling oils. Lubricant load capacity was determined using a four-ball test to determine the maximum no-seizure load (PB) (GB / T3142-2019), which is used to assess the lubricant's wear resistance under high load conditions and represents oil film strength. Copper corrosion resistance was tested in accordance with national standard GB / T 5096-2017.

[0066] The tested performance is as follows: 40℃ viscosity: 52mm 2 / s, saponification value: 176mgKOH / g, ESI: 82%, PB value: 923N, copper corrosion resistance: 1a.

[0067] Example 2

[0068] The composition and preparation method of the anti-spot and anti-corrosion rolling oil are basically the same as those in Example 1, with the main difference being that, based on the total mass of the emulsifier, the ratio of fatty alcohol polyoxyethylene ether fatty acid ester to TX-10 is 1.0:1.

[0069] The tested performance is as follows: 40℃ viscosity: 50mm 2 / s, saponification value: 171 mgKOH / g, ESI: 75%, PB value: 897N, and copper corrosion resistance: 1b. Adding a relatively small amount of fatty alcohol polyoxyethylene ether fatty acid ester reduces viscosity and saponification value, but also reduces ESI stability and PB value.

[0070] Example 3

[0071] The composition and preparation method of the anti-spot and anti-corrosion rolling oil are basically the same as those of Example 1, with the main difference being: extreme pressure anti-wear agent (sulfurized fatty acid methyl ester: oleyl alcohol phosphate: molybdenum dithiophosphate in a ratio of 1:0.7:1.2).

[0072] The tested performance is as follows: 40℃ viscosity: 53mm 2 / s, saponification value: 174mgKOH / g, ESI: 80%, PB value: 885N, copper corrosion resistance: 1b. The PB value decreases significantly when the amount of oleyl phosphate added is relatively small.

[0073] Example 4

[0074] The composition and preparation method of the anti-spot and anti-corrosion rolling oil are basically the same as those of Example 1, with the main difference being that the rust inhibitor is benzotriazole.

[0075] The tested performance is as follows: 40℃ viscosity: 51mm 2 / s, saponification value: 175mgKOH / g, ESI: 82%, PB value: 920N, copper corrosion resistance: 1b. The rust inhibitor is benzotriazole, and the corrosion resistance is slightly reduced.

[0076] Example 5

[0077] The composition and preparation method of the anti-spot and anti-corrosion rolling oil are basically the same as those in Example 1, with the main differences being: S1, pre-dispersion step, stirring at 52° C. until the solution is clear, then adding the nano self-lubricant and using ultrasonic dispersion to mix evenly.

[0078] The tested performance is as follows: 40℃ viscosity: 54mm 2 / s, saponification value: 175mgKOH / g, ESI: 71%, PB value: 871N, copper corrosion resistance: 1b. Without increasing the stirring temperature, the performance tends to decrease, which may be related to uneven mixing.

[0079] Example 6

[0080] The composition and preparation method of the anti-spot and anti-corrosion rolling oil are basically the same as those in Example 1, with the main differences being: S1. The ultrasonic frequency of the ultrasonic dispersion and mixing in the pre-dispersion step is 72 kHz, and the ultrasonic power is 850 W.

[0081] The tested performance is as follows: 40℃ viscosity: 53mm 2 / s, saponification value: 173mgKOH / g, ESI: 73%, PB value: 891N, copper corrosion resistance: 1a. The pre-dispersion was not sufficiently ultrasonically stirred, and the extreme pressure performance was reduced, which may be related to the uneven distribution of the nano self-lubricant.

[0082] Example 7

[0083] A method for using an anti-spot and anti-corrosion rolling oil, using the anti-spot and anti-corrosion rolling oil of Example 1, the method comprising:

[0084] S1. preparing the anti-spot and anti-corrosion rolling oil into an emulsion in which the mass of the anti-spot and anti-corrosion rolling oil accounts for 0.5-3%;

[0085] S2. Prepare a silicon steel strip with a silicon content of 3%, and use a five-stand six-roller cold rolling mill for continuous rolling. The continuous rolling process includes: the surface roughness of the rolls of the 1st and 2nd stands is 1.2 μm, the reduction rates of the first two passes are 39% and 37% respectively, the mass concentration of the emulsion is 2.8%, and the emulsion flow rate is 5700 L / min; the surface roughness of the rolls of the 3rd to 5th stands is 0.1 μm; the mass concentration of the emulsion is 0.8%, and the emulsion flow rate is 8100 L / min; the unit tension between the 1st and 2nd stands is 155 N / mm2 The unit tension between the second and third frames is 175N / mm 2 The unit tension between the 3rd and 4th frames is 195N / mm 2 The unit tension between the 4th and 5th frames is 215N / mm 2 Spot level (field of view is 60mmX60mm, the size and number of spots on the surface of the steel strip after rolling are counted to detect the residual spots on the surface of the steel strip):

[0086] The spots have an equivalent diameter of less than 1 mm and the number is 0-3, which is level 1;

[0087] If the equivalent diameter of the spots is greater than 1 mm and less than 3 mm, and the number is 0-5, it is level 2;

[0088] If the equivalent diameter of the spots is greater than 3 mm and less than 5 mm, and the number is 0-8, it is level 3;

[0089] If the equivalent diameter of the spots is greater than 5 mm and less than 7 mm, and the number is 0-8, it is level 4;

[0090] The equivalent diameter of the spots is greater than 7 mm, the number is greater than 0, and the score is level 5.

[0091] Passed the test: Spot level: Level 1, the spot color is light.

[0092] Example 8

[0093] A method for using an anti-spot and anti-corrosion rolling oil, the method of use being the same as that in Example 7, using the anti-spot and anti-corrosion rolling oil of Example 2; spot level: Level 2, the spot color becomes darker.

[0094] Example 9

[0095] A method for using an anti-spot and anti-corrosion rolling oil, the method of use being the same as that of Example 7, using the anti-spot and anti-corrosion rolling oil of Example 3; spot level: Level 1, the spot color becomes darker.

[0096] Example 10

[0097] A method for using an anti-spot and anti-corrosion rolling oil, the method of use being the same as that of Example 7, using the anti-spot and anti-corrosion rolling oil of Example 4; spot level: Level 2, the spot color becomes darker.

[0098] Example 11

[0099] A method for using an anti-spot and anti-corrosion rolling oil, the method of use being the same as that in Example 7, using the anti-spot and anti-corrosion rolling oil of Example 5; spot level: Level 2, the spot color becomes darker.

[0100] Example 12

[0101] A method for using an anti-spot and anti-corrosion rolling oil, the method of use being the same as that in Example 7, using the anti-spot and anti-corrosion rolling oil of Example 6; spot level: Level 1, the spot color becomes darker.

[0102] Comparative Example 1:

[0103] The composition and preparation method of the anti-spot and anti-corrosion rolling oil are basically the same as those of Example 1, with the main difference being that the base oil is mineral oil 150SN.

[0104] The tested performance is as follows: 40℃ viscosity: 77mm 2 / s, saponification value: 146mgKOH / g, ESI: 58%, PB value: 570N, copper corrosion resistance: 2b. Compared with Example 1, it can be seen that its performance deteriorates faster.

[0105] Comparative Example 2

[0106] A method for using an anti-stain and anti-corrosion rolling oil, the method of use being the same as that in Example 7, using the anti-stain and anti-corrosion rolling oil of Comparative Example 1; a silicon steel strip is obtained by rolling, the stain level being level 4, and the stain color becoming darker.

[0107] Comparative Example 3:

[0108] The composition and preparation method of the anti-spot and anti-corrosion rolling oil are basically the same as those of Example 1, with the main difference being that the nano self-lubricant is nano molybdenum disulfide and nano silicon dioxide, and the ratio of nano molybdenum disulfide to nano silicon dioxide is 1:1 based on the total mass of the nano self-lubricant.

[0109] The tested performance is as follows: 40℃ viscosity: 51mm 2 / s, saponification value: 175mgKOH / g, ESI: 80%, PB value: 914N, copper corrosion resistance: 2a. Compared with Example 1, it can be seen that the nano-silicon dioxide is relatively small, which greatly affects the extreme pressure performance and corrosion resistance.

[0110] Comparative Example 4

[0111] A method for using an anti-spot and anti-corrosion rolling oil, the method of use being the same as that in Example 7, using the anti-spot and anti-corrosion rolling oil of Comparative Example 3; a silicon steel strip is obtained by rolling, the spot grade being level 3, and the spot color becoming darker.

[0112] Comparative Example 5:

[0113] The composition and preparation method of the anti-spot and anti-corrosion rolling oil are basically the same as those in Example 1, with the main difference being that the compatibilizers are isopropyl palmitate and ethyl oleate, and the ratio of isopropyl palmitate to ethyl oleate is 2:1 based on the total mass of the compatibilizer.

[0114] The tested performance is as follows: 40℃ viscosity: 63mm 2 / s, saponification value: 182 mgKOH / g, ESI: 70%, PB value: 871N, copper corrosion resistance: 1b. Compared with Example 1, it can be seen that the ethyl oleate is relatively high, which greatly affects the extreme pressure performance and corrosion resistance.

[0115] Comparative Example 6

[0116] A method for using an anti-spot and anti-corrosion rolling oil is described. The method is the same as in Example 7, except that the anti-spot and anti-corrosion rolling oil of Comparative Example 5 is used. Silicon steel strip is produced by rolling, and the staining grade is Level 3, with the staining color becoming darker. Analysis indicates that a relatively high amount of ethyl oleate affects the amount of staining, which may be related to uneven mixing of the rolling oil system.

[0117] Comparative Example 7

[0118] A method for using an anti-spot and anti-corrosion rolling oil, using the anti-spot and anti-corrosion rolling oil of Example 1, and the method of use is basically the same as that of Example 7, except that: in the method of use, the surface roughness of the rollers of the 1st to 5th stands is 0.5-0.6 μm; silicon steel strip is obtained by rolling, and the spot grade is: Level 3, and the spot color becomes darker.

[0119] Comparative Example 8

[0120] A method for using an anti-spot and anti-corrosion rolling oil, using the anti-spot and anti-corrosion rolling oil of Example 1, and the method of use is basically the same as that of Example 7, except that: the reduction rates of the first two passes in the method of use are 29% and 25% respectively; a silicon steel strip is obtained by rolling, and the spot grade is: Level 4, and the spot color becomes darker.

[0121] Comparative Example 9

[0122] A method for using an anti-spot and anti-corrosion rolling oil, using the anti-spot and anti-corrosion rolling oil of Example 1, the method of use is basically the same as that of Example 7, except that the unit tension between the racks is 150-170N / mm 2 ; Silicon steel strip is obtained by rolling, stain level: level 5, the stain color becomes darker.

[0123] Comparative Example 10

[0124] A method for using an anti-spot and anti-corrosion rolling oil, using the anti-spot and anti-corrosion rolling oil of Example 1, and the method of use is basically the same as that of Example 7, except that: the flow rate of the emulsion in the method of use is 5400 L / min; a silicon steel strip is obtained by rolling, and the spot grade is: level 5, and the spot color becomes darker.

[0125] Comparative Example 11

[0126] A method for using an anti-spot and anti-corrosion rolling oil is disclosed. The anti-spot and anti-corrosion rolling oil of Example 1 is used in a method that is substantially the same as that of Example 7, except that the mass concentration of the emulsion in the method is 1.0%. A silicon steel strip is obtained by rolling, and the spot grade is 5, and the spot color becomes darker.

[0127] The above detailed description of the preferred embodiments of the present invention is only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by 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 invention.

Claims

1. An anti-spot and anti-corrosion rolling oil, characterized by: The components are as follows: base oil: 80-85 parts; synthetic ester: 9-13 parts; antioxidant: 2-3 parts; extreme pressure anti-wear agent: 5-8 parts; rust inhibitor: 2-3 parts; emulsifier: 4-5 parts; compatibilizer 0.7-1.2 parts, nano self-lubricant 0.007-0.012 parts; the base oil is mineral oil 150SN, castor oil and 500SN base oil, based on the total mass of the base oil, the mineral oil in the base oil is 150SN. The ratio of 0SN: castor oil: 500SN base oil is (1.7-1.9): 1: (0.1-0.2); the compatibilizers are isopropyl palmitate and ethyl oleate, and based on the total mass of the compatibilizer, the ratio of isopropyl palmitate: ethyl oleate is 3.4-5.4: 1; the nano self-lubricant is nano molybdenum disulfide and nano silicon dioxide, and based on the total mass of the nano self-lubricant, the ratio of nano molybdenum disulfide: nano silicon dioxide is 1: (1.4-1.5).

2. The anti-spot and anti-corrosion rolling oil according to claim 1, characterized in that: The synthetic ester is trimethylolpropane cocoate.

3. The anti-spot and anti-corrosion rolling oil according to claim 1, characterized in that: The emulsifiers are fatty alcohol polyoxyethylene ether fatty acid esters and alkylphenol polyoxyethylene ethers.

4. The anti-spot and anti-corrosion rolling oil according to claim 3, characterized in that: Based on the total mass of the emulsifier, the ratio of fatty alcohol polyoxyethylene ether fatty acid ester to alkylphenol polyoxyethylene ether is 1.5-1.7:

1.

5. The anti-spot and anti-corrosion rolling oil according to claim 1, characterized in that: The antioxidant can be selected from one or more of an amine antioxidant and a phenolic antioxidant.

6. The anti-spot and anti-corrosion rolling oil according to claim 1, characterized in that: The extreme pressure anti-wear agent is sulfided fatty acid methyl ester: oleyl alcohol phosphate: molybdenum dithiophosphate. Based on the total mass of the extreme pressure anti-wear agent, the sulfided fatty acid methyl ester: oleyl alcohol phosphate: molybdenum dithiophosphate is 1: (1.5-1.7): (1.1-1.3).

7. The anti-spot and anti-corrosion rolling oil according to claim 1, characterized in that: The rust inhibitor is dodecenylsuccinic acid.

8. A method for preparing an anti-spot and anti-corrosion rolling oil, comprising preparing the anti-spot and anti-corrosion rolling oil according to any one of claims 1 to 7, characterized in that: The method comprises: S1, a pre-dispersion step, wherein castor oil and ethyl oleate are mixed to form a premixed liquid, mineral oil 150SN, 500SN and isopropyl palmitate are added to a container and mixed, and then the premixed liquid is slowly added; stirring at 60-70° C. until the solution is clear, and then adding a nano self-lubricant and dispersing and mixing by ultrasonic wave, with an ultrasonic frequency of 40-60 kHz and an ultrasonic power of 730-860 W; S2. Add antioxidant, synthetic ester, emulsifier, extreme pressure anti-wear agent and rust inhibitor in sequence, at a temperature of 50-57°C, perform ultrasonic dispersion with mechanical stirring, ultrasonic frequency of 61-75kHz, ultrasonic power of 730-860W, to obtain anti-spot and anti-corrosion rolling oil.

9. A method for using an anti-spot and anti-corrosion rolling oil, comprising: preparing the anti-spot and anti-corrosion rolling oil according to claim 8 using the method for preparing the anti-spot and anti-corrosion rolling oil according to claim 1, wherein: The usage includes: S1. preparing the anti-spot and anti-corrosion rolling oil into an emulsion in which the mass of the anti-spot and anti-corrosion rolling oil accounts for 0.5-3%; S2. Prepare a silicon steel strip with a silicon content of 2.5%-5%, and use a five-stand six-roller cold rolling mill for continuous rolling. The continuous rolling process includes: the surface roughness of the rolls of the 1st-2nd stands is 1.1-1.2 μm, the reduction rate of the first two passes is 35-39%, the mass concentration of the emulsion is 1.5-3%, and the flow rate of the emulsion is 5200-5800 L / min; the surface roughness of the rolls of the 3rd-5th stands is 0.1-0.3 μm; the mass concentration of the emulsion is 0.5-1.5%, and the flow rate of the emulsion is 7300-8500 L / min.

10. The method for using the anti-spot and anti-corrosion rolling oil according to claim 9, characterized in that: The unit tension between the first and second frames is 150-160N / mm 2 The unit tension between the second and third frames is 160-180N / mm 2 The unit tension between the 3rd and 4th frames is 190-200N / mm 2 The unit tension between the 4th and 5th racks is 210-220N / mm 2 .