Water-soluble stainless steel thin material 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 water-soluble stainless steel thin material rolling oil, a preparation method and a use method, and the water-soluble stainless steel thin material rolling oil comprises the following components by mass: 71-79 parts of base oil; 14 to 18 parts of synthetic ester; 3 to 4 parts of an antioxidant; 3-6 parts of an anti-wear reagent at extreme pressure; 1-2 parts of an antirust agent; 3-4 parts of an emulsifier; 0.5 to 1 part of a compatibilizer; 0.005 to 0.01 part of a nanometer heat conduction agent; the base oil is mineral oil 150SN and castor oil, and based on the total mass of the base oil, the ratio of the mineral oil 150SN to the castor oil in the base oil is (1.3-1.6): 1; the synthetic ester is trimethylolpropane cocoate; the compatibilizer is isopropyl palmitate; the emulsifying agent is fatty alcohol polyoxyethylene ether fatty acid ester and TX-10; the nanometer heat conduction agent is nanometer copper; the emulsion has the advantages of being good in emulsibility, moderate in emulsion particle size, more adaptive to rolling of stainless steel thin materials in water spreadability, good in thermal conductivity and lubricity and the like.

Description

Technical Field

[0001] The present application relates to the technical field of metal rolling and rolling oil, and in particular to a water-soluble stainless steel thin material rolling oil, a preparation method and a use method. Background Art

[0002] In the metalworking industry, especially during cold rolling, the lubrication and cooling capabilities of rolling oils are crucial to metalworking quality. Traditional rolling oil formulations often fail to meet the modern industry's demand for efficient lubrication and cooling, leading to problems such as inaccurate temperature control, fluctuating rolling force control, inefficient cooling, sticking to the rolls, difficult-to-control surface roughness, defects such as scratches and pitting, and difficulty removing the rolling oil after rolling.

[0003] Stainless steel thin strips are typically less than 3mm thick and are used in architectural decoration, kitchen appliances, and automotive parts. They can be further divided into thin stainless steel strips (0.3-3mm) and ultra-thin stainless steel strips (0.01-0.3mm). The main production process uses hot-rolled stainless steel coils (3mm thick and above) as raw material. After pickling to remove the oxide scale, they enter the cold rolling process. Multiple passes are performed on reversing mills or continuous rolling mills, with a single reduction rate controlled at 20%-40%, gradually reducing the thickness to the target value.

[0004] During the rolling process, an emulsion made from emulsifiable, water-soluble rolling oil is used for lubrication and cooling. If the rolling oil's lubricating properties are insufficient, meaning the oil film formed is not strong enough, the oil film will break under high rolling forces, potentially allowing the work rolls to come into direct contact with the plate surface, increasing friction and further heat generation. If the rolling oil doesn't provide immediate cooling, heat can't be removed quickly, causing the work rolls to heat up and deform. This can lead to poor profile and rough surfaces in the rolled strip, as well as thermal fatigue and increased wear on the work rolls themselves, significantly increasing processing costs. Cold rolling of thin stainless steel, due to its uses in architectural decoration, kitchen utensils and automotive parts, requires the surface gloss, high flatness and low roughness after rolling. Due to the large compression ratio, large deformation, rapid work hardening, high heat generation during the rolling of ultra-thin stainless steel strips, and a high possibility of roller sticking during deformation, stainless steel has poor thermal conductivity (lower than carbon steel), and heat transfer is difficult during cold rolling, all of which place higher requirements on the emulsion, such as high temperature stability, the matching ability of emulsion particle size and water separation properties with heat transfer and lubrication properties, etc.

[0005] Therefore, it is necessary to develop a water-soluble stainless steel thin material rolling oil that matches the cooling and lubricating properties required for the preparation of stainless steel thin materials, especially ultra-thin stainless steel thin materials, and has the characteristics of not being easy to stick to the roller, good high-temperature stability, good thermal conductivity and lubrication performance; as well as to develop a better preparation and use method for the water-soluble stainless steel thin material rolling oil, which is not easy to stick to the roller during the rolling process, and the surface after rolling is glossy, flat and low in roughness. Summary of the Invention

[0006] To overcome the shortcomings of the existing technology, the present application provides a water-soluble stainless steel thin rolling oil, a preparation method and a use method, which has the advantages of good emulsification, moderate emulsion particle size, water-free spreading property that is more suitable for stainless steel thin rolling, and good thermal conductivity and lubricity.

[0007] The embodiment of the present application is implemented as follows:

[0008] In a first aspect, the present application provides an example of a water-soluble stainless steel thin rolling oil, which includes the following components, in parts by mass: base oil: 71-79 parts; synthetic ester: 14-18 parts; antioxidant: 3-4 parts; extreme pressure anti-wear agent: 3-6 parts; rust inhibitor: 1-2 parts; emulsifier: 3-4 parts; compatibilizer 0.5-1 part, nano thermal conductor 0.005-0.01 part; the base oil is mineral oil 150SN and castor oil, and based on the total mass of the base oil, the ratio of mineral oil 150SN to castor oil in the base oil is 1.3-1.6:1; the synthetic ester is trimethylolpropane cocoate; the compatibilizer is isopropyl palmitate; the emulsifier is fatty alcohol polyoxyethylene ether fatty acid ester and TX-10; and the nano thermal conductor is nano copper.

[0009] Optionally, based on the total mass of the emulsifier, the ratio of fatty alcohol polyoxyethylene ether fatty acid ester to TX-10 is 1.1-1.3:1.

[0010] Optionally, the antioxidant may be one or more of an amine antioxidant and a phenolic antioxidant.

[0011] Optionally, the antioxidant may be one or more of diphenylamine, p-phenylenediamine, alkylated diphenylamine, 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butylphenol, and alkylbiscyclohexylcresol.

[0012] Optionally, the extreme pressure anti-wear agent is sulfided fatty acid methyl ester: oleyl phosphate and molybdenum dithiophosphate, and 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: (1.2-1.3): (1.3-1.4).

[0013] Optionally, the rust inhibitor is benzotriazole.

[0014] In the second aspect, the present application provides an example of a method for preparing a water-soluble stainless steel sheet rolling oil, wherein the water-soluble stainless steel sheet rolling oil is prepared as described above.

[0015] The method comprises: S1, a pre-dispersion step, adding base oil into a container, stirring at 60-70°C until the solution is clear, then adding a nano thermal conductor and dispersing and mixing by ultrasonic wave;

[0016] S2. Add antioxidant, compatibilizer, synthetic ester, emulsifier, extreme pressure anti-wear agent and rust inhibitor in sequence, and perform ultrasonic dispersion and mechanical stirring at a temperature of 50-57°C to obtain water-soluble stainless steel thin material rolling oil.

[0017] Optionally, in S1, the pre-dispersion step, the ultrasonic dispersion and mixing is performed at an ultrasonic frequency of 40-60 kHz and an ultrasonic power of 730-860 W;

[0018] S2: Ultrasonic dispersion combined with mechanical stirring, ultrasonic frequency 61-75kHz, ultrasonic power 730-860W.

[0019] In a third aspect, the present application provides a method for using a water-soluble stainless steel sheet rolling oil, wherein the water-soluble stainless steel sheet rolling oil is prepared using the aforementioned preparation method.

[0020] The method includes:

[0021] S1. preparing a water-soluble stainless steel sheet rolling oil into an emulsion in which the mass of the water-soluble stainless steel sheet rolling oil accounts for 2-5%;

[0022] S2, using stainless steel strip with thickness of 3-6mm and width of 1000-1600mm, adopting five-stand cold rolling process, rolling into stainless steel strip with thickness of 0.3-0.8mm through five passes, wherein the cold rolling process includes: the surface roughness of the roller of the first stand is 0.7-0.8μm, the surface roughness of the roller of the second stand is 0.5-0.6μm; the reduction rate of the first two passes is 28-34%, and the emulsion quality is 100-150%. The concentration is 3-5%, the flow rate of the emulsion is 4300-4600L / min, and the rolling speed is 91-110m / min; the surface roughness of the rolls of the 3rd-4th stands is 0.3-0.5μm; the surface roughness of the rolls of the 5th stand is 0.1-0.3μm; the mass concentration of the emulsion is 2-3%, the flow rate of the emulsion is 4800-5300L / min, and the rolling speed is 115-130m / min.

[0023] Optionally, the stainless steel strip is 316 stainless steel, and after continuous rolling, the thickness deviation of the stainless steel sheet is less than 0.02 mm, the roughness is less than 0.1 μm, and the surface reflectivity after annealing is more than 93%.

[0024] Beneficial effects include:

[0025] The present invention provides a water-soluble stainless steel thin material rolling oil. By compounding castor oil and mineral oil 150SN, the kinematic viscosity of the base oil can be made variable before and after entering the deformation zone. The kinematic viscosity becomes smaller in the high-temperature zone of the deformation zone, which helps to control the uniform distribution of rolling pressure in the rolling oil system at high temperatures, improve the surface uniformity of the strip, and avoid sticking to the roller. Before rolling in the high-temperature deformation zone, the viscosity is appropriately increased to increase the thickness of the oil film formed, improve the lubricity, and avoid damage to the surface of the stainless steel strip due to film defects. Trimethylolpropane cocoate has a strong affinity for metals and is more suitable for rolling thin stainless steel strips under high pressure. It can enhance the kinematic viscosity of the rolling oil before and after entering the deformation zone, and the kinematic viscosity decreases in the high-temperature zone of the deformation zone, which helps to control the uniform distribution of rolling pressure in the rolling oil system at high temperatures, improve the surface uniformity of the strip, and avoid sticking to the rollers. The addition of a compatibilizer promotes the compatibility of the components of the rolling oil system, which is conducive to the formation of a stable emulsion, thereby avoiding uneven distribution of the emulsion stratification, resulting in differences in cooling, lubrication and thermal conductivity on the surface of the thin stainless steel strip, affecting the surface finish of the stainless steel, increasing the thickness tolerance, and increasing the roughness. After entering the high-temperature, high-pressure zone, the molecular chains of fatty alcohol polyoxyethylene ether fatty acid esters shrink into agglomerates, losing their emulsifying ability. This causes the oil and water to rapidly separate and spread across the strip's surface, increasing film formation speed and film strength, thereby enhancing the lubricity of the rolling oil. The addition of TX-10 (alkylphenol polyoxyethylene ether) to the fatty alcohol polyoxyethylene ether fatty acid esters allows the fatty alcohol polyoxyethylene ether fatty acid esters and TX-10 to 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. Nano-copper particles form a copper-rich lubricating film on the metal surface that not only lubricates but also efficiently transfers heat. The addition of nano-copper allows the rolling oil to absorb and transfer heat more quickly, thereby reducing thermal deformation of thin stainless steel strips that can be easily caused by local overheating during rolling, which can also lead to oxidation, discoloration, or roughness.

[0026] By stirring the base oil at a higher temperature, the mixing effect of base oils with different polarities can be improved; by adding antioxidants in advance, the stability and antioxidant capacity of the rolling oil system can be improved, and by lowering the mixing temperature, the impact of high temperature on the system can be reduced; by adding compatibilizers to improve the compatibility of the base oil and further improve the mixing effect; by adding synthetic esters, emulsifiers, etc., the mixing can be further improved at a lower temperature to prevent stratification.

[0027] By coordinating the roller roughness control, reduction rate, rolling speed, emulsion concentration, emulsion flow rate, etc. in the rolling process, stainless steel plates and strips are rolled with a thickness deviation of less than 0.02mm and a roughness of less than 0.1μm; after annealing, the surface reflectivity of the high-performance stainless steel sheet reaches more than 93%. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In view of the problems that occur during the rolling process of thin stainless steel strips, such as large compression ratio, large deformation, rapid work hardening, large heat generation during cold rolling, high possibility of roller sticking during deformation, poor thermal conductivity of stainless steel (lower than carbon steel), difficulty in heat transfer during cold rolling, low flatness of thin stainless steel strips after rolling, increased roughness, and easy occurrence of scratches and pitting, the embodiments of the present invention provide a water-soluble stainless steel thin material rolling oil, a preparation method, and a use method.

[0032] Exemplarily, a water-soluble stainless steel sheet rolling oil is provided, comprising the following components:

[0033] A water-soluble stainless steel sheet rolling oil is prepared from the following ingredients: base oil: 71-79 parts; synthetic ester: 14-18 parts; antioxidant: 3-4 parts; extreme pressure anti-wear agent: 3-6 parts; rust inhibitor: 1-2 parts; emulsifier: 3-4 parts; compatibilizer: 0.5-1 part; nano thermal conductor: 0.005-0.01 part.

[0034] Synthetic ester and mineral base oil are used as carriers to ensure basic lubrication and cooling effects.

[0035] The main component of water-soluble stainless steel sheet rolling oil, base oil, plays a fundamental role in ensuring the quality stability and performance of the oil. However, existing rolling oils use a single mineral oil base. Mineral oil has poor biodegradability, which limits the environmental performance of the lubricant. At the same time, mineral oil has poor miscibility with other additives and is prone to stratification or forming uneven emulsions, making it difficult to form a stable boundary lubrication film. The friction coefficient and cooling performance fluctuate greatly during the rolling process, affecting the surface finish of stainless steel sheet products. Vegetable oil-based lubricants have the advantages of being renewable, non-toxic, biodegradable, stable, antioxidant, and anti-wear. Selecting the appropriate vegetable-based oil in combination with the mineral-based oil can effectively improve the performance of the base oil.

[0036] Base oil: 71-79 parts (optional 71, 72, 73, 74, 75, 76, 77, 78, 79, etc.); base oil includes a type of mineral oil 150SN, 150SN base oil is also called lubricating oil base oil, which is refined through a hydrogenation process in the presence of high-pressure hydrogen and catalyst in 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), which can maintain a stable lubricating film when high compression ratios are generated during the rolling process of stainless steel thin materials, reducing direct friction between the rolls and the stainless steel thin materials. Its medium viscosity helps to control the uniform distribution of rolling pressure, improve the uniformity of the strip surface, and prevent sticking to the rolls. The base oil also includes castor oil. Castor oil molecules contain polar hydroxyl groups and unsaturated bonds, which are more likely to form good physical adsorption with the surface of stainless steel thin strips, providing better lubrication and wear reduction. Castor oil has a high kinematic viscosity at low temperatures (such as 20-30°C), reaching 300mm 2 / s, at high temperatures (above 100 ° C), the kinematic viscosity can drop sharply to 75mm 2With a medium viscosity below 0.1 / s, the oil film exhibits strong shear resistance in the rolling deformation zone and can 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 the rolling oil system maintain uniform rolling pressure distribution at high temperatures, improving strip surface uniformity and preventing sticking. Prior to entering the high-temperature deformation zone, the viscosity is appropriately increased to increase the thickness of the oil film, enhance lubricity, and prevent damage to the stainless steel strip surface caused by film defects. 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 rolled piece and affect plate surface quality. Ricinoleic acid, as the main fatty acid of castor oil (content is more than 80%), not only gives the oil properties, but also has antioxidant function. It contains ingredients such as vitamin E, polyphenols and flavonoids, which have certain antioxidant capacity. When it is compounded with mineral oil, the antioxidant capacity of the base oil is improved, the formation of oxidized colloids is reduced, and it is beneficial to extend the service life of the roller.

[0037] Based on the total mass of the base oil, the ratio of mineral oil 150SN to castor oil in the base oil is 1.3-1.6:1 (optional options are 1.3, 1.4, 1.5, 1.6, etc.). Mineral oil 150SN is low-cost, and castor oil is widely available and a relatively low-cost oil. The combination of the two is beneficial for controlling rolling oil costs. In addition, the high relative proportion of mineral oil 150SN ensures that the kinematic viscosity of the combination is moderate, which is beneficial for controlling the thickness of the oil film and achieving stable lubrication of the oil under high pressure and temperature. It helps to control the uniform distribution of rolling pressure, improve the uniformity of the strip surface, and prevent sticking to the rollers. If the ratio of the two is less than the above range, the proportion of castor oil used is too high, the viscosity of the rolling oil is too high, the film thickness is too thick, and the lubricity is too great, resulting in insufficient rolling force. An excessively thick oil film also increases the risk of sticking to the rollers. If the ratio of the two is greater than the above range, the proportion of mineral oil 150SN used is too high, the antioxidant capacity of the base oil becomes low, and the kinematic viscosity of the base oil before and after entering the deformation zone changes little, which is not conducive to controlling the uniform distribution of rolling pressure, improving the surface uniformity of the strip, and avoiding roller sticking. At the same time, the biodegradability is reduced.

[0038] Synthetic ester: 14-18 parts (optional 14, 15, 16, 17, 18, etc.). The synthetic ester is trimethylolpropane cocoate, which has a wide liquid temperature range, excellent lubrication performance, high viscosity index and 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 and further reduce friction and wear. Viscosity 40℃: 30-40 (mm 2 / s); 100℃: 7-9(mm 2 / s), making it more suitable for high-pressure rolling of thin stainless steel strip. It enhances the kinematic viscosity of the rolling oil before and after entering the deformation zone, reducing its kinematic viscosity in the high-temperature zone of the deformation zone. This helps the rolling oil system control the uniform distribution of rolling pressure at high temperatures, improves the surface uniformity of the strip, and prevents sticking to the rollers. Trimethylolpropane cocoate and ricinoleic acid glyceride, the main component of castor oil, have similar chemical structures and polarities, resulting in good compatibility, allowing them to mix evenly and preventing stratification. Furthermore, by leveraging its hydrophilicity and using a higher proportion of trimethylolpropane cocoate, trimethylolpropane cocoate is more compatible with castor oil, improving its compatibility with the base oil. This also helps improve the emulsification properties and stability of the emulsion formulated with water-soluble stainless steel thin rolling oil, thereby achieving suitable water-free spreading properties, which helps enhance film formation, lubricity, and thermal conductivity of the emulsion during high-pressure rolling of thin stainless steel strip.

[0039] The compatibilizer is 0.5-1 part (optional values include 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.), which is isopropyl palmitate. Mineral oil 150SN is non-polar, while castor oil is moderately polar. This polarity difference causes the two to separate when mixed. The addition of moderately polar isopropyl palmitate creates a favorable interaction with the non-polar mineral oil 150SN and the moderately polar castor oil, acting as a "bridge." Isopropyl palmitate is an ester compound with a similar ester structure to castor oil. Its non-polar alkyl chain is compatible with the hydrocarbon structure of mineral oil 150SN. The molecular size of isopropyl palmitate is between that of mineral oil and castor oil. It can fill the molecular gap between the two and improve the mixing uniformity. The addition of a compatibilizer promotes the compatibility of the components of the rolling oil system, which is conducive to the formation of a stable emulsion, thereby avoiding uneven distribution of the emulsion stratification, resulting in differences in cooling, lubrication and thermal conductivity on the surface of thin stainless steel strips, affecting the surface finish of the stainless steel, increasing the thickness tolerance, and increasing the roughness.

[0040] Emulsifier: 3-4 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 ester is selected as the emulsifier. The polarity difference between 150SN mineral oil (non-polar), castor oil (medium polarity) and trimethylolpropane cocoate (medium polarity) may lead to compatibility problems. The emulsifier can bridge oil phases of different polarities and improve overall compatibility through its amphiphilic structure (hydrophilic head (polyoxyethylene chain) and lipophilic tail (long-chain fatty alcohol or fatty acid part)). Fatty alcohol polyoxyethylene ether fatty acid ester can be adsorbed on the oil phase interface and reduce the interfacial tension between 150SN mineral 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. Due to the thinness of thin stainless steel strip, deviations in thermal conductivity affect the thermal conductivity of different areas of the strip, resulting in differences in the metal structure of the thin strip and increasing the thickness tolerance of the thin strip. Uneven distribution of the lubricating film will also lead to deviations in the mutual influence between the roller and the metal surface, exacerbating the thickness tolerance of the thin strip. Furthermore, at normal operating temperatures, the agent's molecules are linear and have good emulsification properties. However, after entering the high-temperature and high-pressure zone, the molecular chains shrink into clumps, losing their emulsification ability, prompting the oil and water to quickly separate and spread across the surface of the strip, increasing its film-forming speed and oil film strength, thereby achieving the purpose of improving the lubricity of the rolling oil. This makes it more conducive to forming an oil film on the surface of thin stainless steel strip, which generates high heat during high-pressure rolling, thereby improving the lubrication and protection of the thin stainless steel strip surface and enhancing its surface quality.

[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 interacting with non-polar 150SN mineral oil. 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 mineral oil, 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, making it more suitable for thin stainless steel strip rolling process under high pressure conditions, with more stable performance and maintaining 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 1.1-1.3:1; increasing the dosage ratio of fatty alcohol polyoxyethylene ether fatty acid ester is conducive to matching with a high proportion of 150SN mineral oil, thereby giving full play to the emulsification effect of each emulsifier.

[0043] Antioxidant: 3-4 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, 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: 3-6 parts (optional: 3, 4, 5, 6, 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 the surface of stainless steel strip to form a sulfide extreme pressure film and is highly biodegradable. Oleyl alcohol phosphate (CAS 37310-83-1) can reduce friction and wear under conditions of boundary lubrication caused by high loads. Molybdenum dithiophosphate (MoDTP) can decompose peroxides (ROOH) generated during the oxidation process of rolling oil, preventing further decomposition into free radicals, thereby interrupting the oxidation chain reaction and providing excellent antioxidant properties. By combining these three extreme pressure anti-wear agents in a certain proportion, a strong extreme pressure-resistant oil film can be quickly formed on the rolled steel surface under high temperature and high pressure conditions during the rolling lubrication of thin stainless steel strip, effectively ensuring lubricity during the rolling process. Optionally, based on the total mass of the extreme pressure anti-wear agent, the ratio of sulfided fatty acid methyl ester: oleyl alcohol phosphate: molybdenum dithiophosphate is 1: (1.2-1.3): (1.3-1.4), thereby improving the antioxidant property while taking into account the biodegradability and having excellent high pressure resistance.

[0045] Rust inhibitor: 1-2 parts; alkylamine, cyclohexylamine, benzotriazole (BTA), oleic acid, stearic acid, dodecenylsuccinic acid, etc. can be selected. Benzotriazole (BTA) is preferred because it has excellent high-temperature stability and is more suitable for rolling thin stainless steel strips. The surface of stainless steel is rich in chromium (Cr) and nickel (Ni). These metal atoms have strong coordination ability with the nitrogen atoms of benzotriazole, so that BTA can be firmly adsorbed on the stainless steel surface, and it can preferentially adsorb on defective areas (such as grain boundaries, inclusions, scratches, etc.) on the stainless steel surface to prevent the occurrence of localized corrosion.

[0046] 0.005-0.01 parts of nano thermal conductor (optional: 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, etc.); optional nano copper (for example, the brand is Hongwu Nano, with a particle size of 20nm-200nm);

[0047] During the rolling process, thin stainless steel strip is susceptible to thermal deformation due to localized overheating. This can cause oxidation, discoloration, or roughening, which also affects the surface finish after rolling. Avoiding this localized overheating can also affect production efficiency by reducing the rolling speed. Copper has a thermal conductivity of up to 401 W / (m·K), far exceeding the thermal conductivity of base oil. Nano-copper particles, with their large surface area and surface activity, can be evenly dispersed in the oil phase, forming an efficient heat conduction network that significantly improves the oil phase's thermal conductivity. Nano-copper particles form a copper-rich lubricating film on the metal surface, which not only lubricates but also efficiently transfers heat. The addition of nano-copper allows the rolling oil to absorb and transfer heat more quickly, thereby reducing the thermal deformation, oxidation, discoloration, or roughening that can occur during the rolling process. This also affects the surface finish after rolling. Avoiding this localized overheating can also affect production efficiency by reducing the rolling speed. Nano-copper is relatively expensive. If its inclusion is primarily for its lubricity (copper is self-lubricating), adding too high a proportion will result in excessive costs, limiting its use. However, considering thermal conductivity, a lower amount can be added, allowing nano-copper to fully utilize its role as a thermal conductor in rolling oil.

[0048] Fatty alcohol polyoxyethylene ether fatty acid esters or TX-10 prevent nanocopper from agglomerating. Their lipophilic tails (e.g., long-chain fatty alcohols or alkylphenols) can adsorb to the nanocopper surface through van der Waals forces. This inherent advantage of adding nanocopper to the rolling oil system is its stability, reduced agglomeration, and uniform dispersion, thereby enhancing the nanocopper's thermal conductivity. Furthermore, increasing the emulsifier ratio to 3.5-4.5 parts further enhances the stability of the emulsion and improves its thermal conductivity.

[0049] A method for preparing the water-soluble stainless steel sheet rolling oil is provided for the above water-soluble stainless steel sheet rolling oil. The method comprises:

[0050] S1, pre-dispersion step, adding the base oil into the container, stirring at 60-70°C (optionally 60°C, 63°C, 64°C, 66°C, 68°C, 70°C, etc.) until the solution is clear, then adding the nano thermal conductor and further dispersing and mixing by ultrasound, 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 oils with different polarities is improved; the nano thermal conductor is dispersed by low-frequency, high-power ultrasound, which is beneficial to improve the dispersion of the nano thermal conductor and reduce agglomeration.

[0051] S2. Add antioxidant, compatibilizer, synthetic ester, emulsifier, extreme pressure anti-wear agent, and rust inhibitor in sequence, and perform ultrasonic dispersion with mechanical stirring at a temperature of 50-57°C (optionally 50°C, 51°C, 52°C, 53°C, 54°C, 57°C, etc.), with an ultrasonic frequency of 61-75kHz (optionally 61kHz, 65kHz, 71kHz, 72kHz, 74kHz, 75kHz, etc.) and an ultrasonic power of 730-860W to obtain a water-soluble stainless steel thin material 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 compatibilizers, the compatibility of the base oil is further improved to further improve the mixing effect; 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 conditions of relatively low viscosity of the dispersion system and long mixing time.

[0052] A method for using the water-soluble stainless steel sheet rolling oil is provided for the above water-soluble stainless steel sheet rolling oil. The method comprises:

[0053] S1. preparing a water-soluble stainless steel sheet rolling oil into an emulsion in which the mass of the water-soluble stainless steel sheet rolling oil accounts for 2-5%;

[0054] S2. Prepare a stainless steel strip with a thickness of 3-6 mm and a width of 1000-1600 mm, which can be 316 stainless steel; adopt a five-stand cold rolling process to roll the stainless steel strip with a thickness of 0.3-0.8 mm (optionally 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc.) through 5 passes, wherein the cold rolling process includes: the surface roughness of the roll of the first stand is 0.7-0.8 μm (it can be understood that roughness refers to average roughness, the same below), the surface roughness of the roll of the second stand is 0.5-0.6 μm; the reduction rate of the first two passes is 28-34% (optionally 28%, 29%). , 31%, 32%, 33%, 34%, etc.), the mass concentration of the emulsion is 3-5% (refers to the emulsion in which the mass of water-soluble stainless steel thin rolling oil accounts for 3-5%), the flow rate of the emulsion is 4300-4600L / min, and the rolling speed is 91-110m / min (optional are 91m / min, 97m / min, 103m / min, 105m / min, 107m / min, 109m / min, 110m / min, etc.); the surface roughness of the roller of the first stand is improved, which is conducive to the bite of the stainless steel strip. The "oil storage effect" of the high-roughness roller may form a micro-pit oil storage structure on the surface of the roller, and the high-concentration The emulsion is conducive to forming a thicker lubricating film, prolonging the duration of the oil film, reducing the risk of roll wear and thermal scratching, forming a better lubrication and cooling effect, and is more conducive to achieving the realization of large reduction rate and large deformation in the first two stands, increasing the deformation capacity in the early stage, reducing the reduction rate in the later stage, reducing the fluctuation of rolling force in the later stage, and reducing thickness deviation; the surface roughness of the rolls of the 3rd and 4th stands is 0.3-0.5μm (optional 0.3μm, 0.4μm, 0.5μm, etc.); the surface roughness of the rolls of the 5th stand is 0.1-0.3μm (optional 0.1μm, 0.2μm, 0.3μm, etc.); the mass concentration of the emulsion is 2-3%, and the flow rate of the emulsion is 4800- 5300L / min, rolling speed is 115-130m / min (optional are 115m / min, 117m / min, 119m / min, 121m / min, 126m / min, 128m / min, 130m / min, etc.); the 3rd-4th and 5th stands gradually reduce the surface roughness of the rolls, which is beneficial to reducing frictional heat generation as the thickness of the stainless steel sheet decreases. The use of emulsion with a reduced proportion of rolling oil and increased emulsion flow can enhance cooling, improve the ability to remove impurities during the rolling process, reduce roll sticking, and is beneficial to improving the surface quality of stainless steel sheet, reducing the occurrence of defects such as micro pits, and improving flatness.

[0055] The stainless steel strip is obtained by rolling, with a thickness deviation of less than 0.02mm and a roughness of less than 0.1μm; the surface reflectivity after annealing is more than 93%.

[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 water-soluble stainless steel thin material rolling oil is prepared from the following components, measured in parts by mass: base oil: 73 parts (the base oil comprises mineral oil 150SN and castor oil, and the ratio of mineral oil 150SN to castor oil in the base oil is 1.4:1, based on the total mass of the base oil); synthetic ester (trimethylolpropane cocoate): 15 parts; antioxidant (2,6-di-tert-butyl-p-cresol (BHT)): 3 parts; extreme pressure anti-wear agent (sulfurized fatty acid methyl ester: oleyl alcohol phosphate: molybdenum dithiophosphate in the ratio of 1:1.2:1.3): 4 parts; rust inhibitor (benzotriazole): 2 parts; emulsifier (based on the total mass of the emulsifier, the ratio of fatty alcohol polyoxyethylene ether fatty acid ester to TX-10 is 1.2:1): 4 parts; compatibilizer (isopropyl palmitate): 0.7 parts; and nano thermal conductor (nano copper): 0.007 parts.

[0059] A method for preparing a water-soluble stainless steel sheet rolling oil, wherein the water-soluble stainless steel sheet rolling oil is prepared, and the component ratios are in accordance with the aforementioned ratios;

[0060] The method comprises: S1, a pre-dispersion step, adding a base oil (the base oil is mineral oil 150SN and castor oil, and the ratio of mineral oil 150SN to castor oil in the base oil is 1.4:1 based on the total mass of the base oil) into a container, stirring at 63° C. until the solution is clear, then adding a nano thermal conductor and dispersing and mixing by ultrasonic wave, wherein the ultrasonic frequency of the ultrasonic dispersion and mixing is 55 kHz and the ultrasonic power is 740 W;

[0061] S2. Antioxidant, compatibilizer, synthetic ester, emulsifier, extreme pressure anti-wear agent and rust inhibitor are added in sequence. At a temperature of 54°C, ultrasonic dispersion is combined with mechanical stirring. The ultrasonic frequency is 74 kHz and the ultrasonic power is 820 W to obtain a water-soluble stainless steel thin rolling oil.

[0062] Performance testing method:

[0063] Test subjects: Water-soluble stainless steel sheet rolling oils and their emulsions from each example and comparative example (the mass ratio of water-soluble stainless steel sheet rolling oil in the emulsion was 3%). Viscosity at 40°C was tested according to GB / T 265, and saponification value was tested according to GB / T 8021-2003. Emulsion stability: Emulsion stability index (ESI, %) was tested according to petrochemical industry standard SH / T0579-1994 to evaluate the emulsification properties of cold rolling oils. Lubricant load capacity was determined using the four-ball test to measure 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.

[0064] The tested performance is as follows: 40℃ viscosity: 41mm 2 / s, saponification value: 183mgKOH / g, ESI: 71%, PB value: 893N.

[0065] Example 2

[0066] The composition and preparation method of the water-soluble stainless steel sheet rolling oil are basically the same as those of 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 0.8:1.

[0067] The tested performance is as follows: 40℃ viscosity: 40mm 2 / s, saponification value: 178mgKOH / g, ESI: 68%, PB value: 880N. 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.

[0068] Example 3

[0069] The composition and preparation method of the water-soluble stainless steel thin 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 1:1.1:1.0).

[0070] The tested performance is as follows: 40℃ viscosity: 41mm 2 / s, saponification value: 181 mgKOH / g, ESI: 70%, PB value: 860N. The PB value decreased significantly when the amount of oleyl phosphate and molybdenum dithiophosphate added was relatively small.

[0071] Example 4

[0072] The composition and preparation method of the water-soluble stainless steel sheet rolling oil are basically the same as those in Example 1, with the main differences being: S1, pre-dispersion step, stirring at 54° C. until the solution is clear, and then adding the nano thermal conductor and dispersing and mixing by ultrasonic wave.

[0073] The tested performance is as follows: 40℃ viscosity: 43mm 2 / s, saponification value: 182mgKOH / g, ESI: 61%, PB value: 841N. Without increasing the stirring temperature, the performance tends to decrease, which may be related to uneven mixing.

[0074] Example 5

[0075] The composition and preparation method of the water-soluble stainless steel thin 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 74 kHz, and the ultrasonic power is 820 W.

[0076] The tested performance is as follows: 40℃ viscosity: 42mm 2 / s, saponification value: 181mgKOH / g, ESI: 69%, PB value: 878N. The pre-dispersion was not sufficiently ultrasonically stirred, and the extreme pressure performance was reduced, which may be related to the uneven distribution of nano-copper.

[0077] Example 6

[0078] A method for using a water-soluble stainless steel sheet rolling oil, using the water-soluble stainless steel sheet rolling oil of Example 1, the method comprising:

[0079] S1. preparing a water-soluble stainless steel sheet rolling oil into an emulsion in which the mass of the water-soluble stainless steel sheet rolling oil accounts for 2-5%;

[0080] S2. Prepare 316 stainless steel plates and strips with a thickness of 4 mm and a width of 1450 mm, and adopt a five-stand cold rolling process to roll them into stainless steel plates and strips with a thickness of 0.4 mm through five passes, wherein the cold rolling process includes: the surface roughness of the rolls of the first stand is 0.7 μm, and the surface roughness of the rolls of the second stand is 0.5 μm; the reduction rates of the first two passes are 34% and 29% respectively, the mass concentration of the emulsion is 5%, the flow rate of the emulsion is 4500 L / min, and the rolling speed is 95 m / min; the surface roughness of the rolls of the 3rd-4th stands is 0.4 μm; the surface roughness of the rolls of the 5th stand is 0.1 μm; the mass concentration of the emulsion is 3%, the flow rate of the emulsion is 5100 L / min, and the rolling speed is 123 m / min.

[0081] The stainless steel strip is obtained by rolling, with a thickness deviation of less than 0.01mm and a roughness of less than 0.05μm; the surface reflectivity after annealing reaches 96%.

[0082] Example 7

[0083] A method for using a water-soluble stainless steel thin material rolling oil, the method of use being the same as that in Example 6, using the water-soluble stainless steel thin material rolling oil of Example 2; a stainless steel plate strip is obtained by rolling, the thickness deviation of which is less than 0.015 mm and the roughness of which is less than 0.08 μm; and the surface reflectivity after annealing reaches 95%.

[0084] Example 8

[0085] A method for using a water-soluble stainless steel thin material rolling oil, the method of use being the same as that in Example 6, using the water-soluble stainless steel thin material rolling oil of Example 3; a stainless steel plate strip is obtained by rolling, the thickness deviation of which is less than 0.013 mm and the roughness of which is less than 0.07 μm; and the surface reflectivity after annealing reaches 94%.

[0086] Example 9

[0087] A method for using a water-soluble stainless steel thin material rolling oil, the method of use being the same as that in Example 6, using the water-soluble stainless steel thin material rolling oil of Example 4; a stainless steel plate strip is obtained by rolling, the thickness deviation of which is less than 0.017 mm and the roughness of which is less than 0.09 μm; and the surface reflectivity after annealing reaches 93%.

[0088] Example 10

[0089] A method for using a water-soluble stainless steel thin material rolling oil, the method of use being the same as that in Example 6, using the water-soluble stainless steel thin material rolling oil of Example 5; a stainless steel plate strip is obtained by rolling, the thickness deviation of which is less than 0.014 mm and the roughness of which is less than 0.06 μm; and the surface reflectivity after annealing reaches 95%.

[0090] Comparative Example 1:

[0091] The composition and preparation method of the water-soluble stainless steel thin rolling oil are basically the same as those of Example 1, with the main difference being that the base oil is mineral oil 150SN.

[0092] The tested performance is as follows: 40℃ viscosity: 72mm 2 / s, saponification value: 152 mgKOH / g, ESI: 55%, PB value: 550 N. Compared with Example 1, it can be seen that its performance deteriorates faster.

[0093] Comparative Example 2

[0094] A method for using a water-soluble stainless steel thin material rolling oil, the method of use being the same as that in Example 6, using the water-soluble stainless steel thin material rolling oil of Comparative Example 1; a stainless steel plate strip is obtained by rolling, the thickness deviation of which is less than 0.06 mm and the roughness of which is less than 0.3 μm; and the surface reflectivity after annealing reaches 78%.

[0095] Comparative Example 3:

[0096] The composition and preparation method of the water-soluble stainless steel sheet rolling oil are basically the same as those of Example 1, with the main difference being that the water-soluble stainless steel sheet rolling oil does not contain a nano thermal conductor.

[0097] The tested performance is as follows: 40℃ viscosity: 41mm 2 / s, saponification value: 182 mgKOH / g, ESI: 70%, PB value: 870 N. Compared with Example 1, it can be seen that without adding the nano thermal conductor, the extreme pressure performance is greatly affected.

[0098] Comparative Example 4

[0099] A method for using a water-soluble stainless steel thin material rolling oil is disclosed. The method of use is the same as that of Example 6, except that the water-soluble stainless steel thin material rolling oil of Comparative Example 3 is used. A stainless steel strip is obtained by rolling, and the stainless steel strip has a thickness deviation of less than 0.022 mm and a roughness of less than 0.15 μm. After annealing, the surface reflectivity reaches 83%. Analysis shows that the surface quality is affected without the addition of nano-copper, which may be related to its insufficient thermal conductivity.

[0100] Comparative Example 5:

[0101] The composition and preparation method of the water-soluble stainless steel sheet rolling oil are basically the same as those of Example 1, with the main difference being that isopropyl palmitate is not contained.

[0102] The tested performance is as follows: 40℃ viscosity: 44mm 2 / s, saponification value: 176 mgKOH / g, ESI: 66%, PB value: 853 N. Compared with Example 1, it can be seen that not adding isopropyl palmitate greatly affects the stability and extreme pressure performance of the emulsifier.

[0103] Comparative Example 6

[0104] A method for using a water-soluble stainless steel sheet rolling oil is disclosed. The method is the same as that in Example 6, except that the water-soluble stainless steel sheet rolling oil of Comparative Example 5 is used. Stainless steel sheets and strips are obtained by rolling, and have a thickness deviation of less than 0.018 mm and a roughness of less than 0.11 μm. After annealing, the surface reflectivity reaches 85%. Analysis shows that the surface quality is affected by not adding isopropyl palmitate, which may be related to uneven mixing of the rolling oil system.

[0105] Comparative Example 7:

[0106] The composition and preparation method of the water-soluble stainless steel sheet rolling oil are basically the same as those of Example 1, with the main difference being that trimethylolpropane cocoate is not contained and its component ratio is replaced by the base oil component.

[0107] The tested performance is as follows: 40℃ viscosity: 55mm 2 / s, saponification value: 153 mgKOH / g, ESI: 54%, PB value: 750 N. Compared with Example 1, it can be seen that not adding trimethylolpropane cocoate greatly affects the viscosity, lubricity, emulsifier stability and extreme pressure performance.

[0108] Comparative Example 8

[0109] A method for using a water-soluble stainless steel sheet rolling oil is disclosed. The method is the same as that in Example 6, except that the water-soluble stainless steel sheet rolling oil of Comparative Example 7 is used. A stainless steel strip is obtained by rolling, and the stainless steel strip has a thickness deviation of less than 0.025 mm and a roughness of less than 0.17 μm. After annealing, the surface reflectivity reaches 71%. Analysis shows that the surface quality is affected by not adding trimethylolpropane cocoate.

[0110] Comparative Example 9

[0111] A method for using a water-soluble stainless steel thin material rolling oil, using the water-soluble stainless steel thin material rolling oil of Example 1, and the method of use is basically the same as that of Example 6, except that: in the method of use, the surface roughness of the rollers of the 1st to 5th stands is 0.7-0.8 μm;

[0112] The stainless steel strip is obtained by rolling, with a thickness deviation of less than 0.023 mm and a roughness of less than 0.13 μm; the surface reflectivity after annealing reaches 82%.

[0113] Comparative Example 10

[0114] A method for using a water-soluble stainless steel thin material rolling oil, using the water-soluble stainless steel thin material rolling oil of Example 1, and the method of use is basically the same as that of Example 6, except that: the reduction rates of the first two passes in the method of use are 27% and 26% respectively;

[0115] The stainless steel strip is obtained by rolling, with a thickness deviation of less than 0.022 mm and a roughness of less than 0.11 μm; the surface reflectivity after annealing reaches 86%.

[0116] Comparative Example 11

[0117] A method for using a water-soluble stainless steel sheet rolling oil, using the water-soluble stainless steel sheet rolling oil of Example 1, and the method of use is basically the same as that of Example 6, except that: the rolling speed in the method of use is 92 m / min;

[0118] The stainless steel strip is obtained by rolling, with a thickness deviation of less than 0.024 mm and a roughness of less than 0.14 μm; the surface reflectivity reaches 80% after annealing.

[0119] Comparative Example 12

[0120] A method for using a water-soluble stainless steel sheet rolling oil, using the water-soluble stainless steel sheet rolling oil of Example 1, and the method of use is basically the same as that of Example 6, except that: the rolling speed in the method of use is 121 m / min;

[0121] The stainless steel strip is obtained by rolling, with a thickness deviation of less than 0.027 mm and a roughness of less than 0.16 μm; the surface reflectivity reaches 75% after annealing.

[0122] Comparative Example 13

[0123] A method for using a water-soluble stainless steel sheet rolling oil, using the water-soluble stainless steel sheet rolling oil of Example 1, the method of use is basically the same as that of Example 6, except that: the flow rate of the emulsion in the method of use is 4100 L / min.

[0124] The stainless steel strip is obtained by rolling, with a thickness deviation of less than 0.025 mm and a roughness of less than 0.15 μm; the surface reflectivity after annealing reaches 82%.

[0125] 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. A water-soluble stainless steel sheet rolling oil, characterized by: The composition comprises the following components in parts by mass: base oil: 71-79 parts; synthetic ester: 14-18 parts; antioxidant: 3-4 parts; extreme pressure anti-wear agent: 3-6 parts; rust inhibitor: 1-2 parts; emulsifier: 3-4 parts; compatibilizer: 0.5-1 parts; nano thermal conductor: 0.005-0.01 parts; The base oil is mineral oil 150SN and castor oil. Based on the total mass of the base oil, the ratio of mineral oil 150SN to castor oil in the base oil is 1.3-1.6:1; the synthetic ester is trimethylolpropane cocoate; the compatibilizer is isopropyl palmitate; the emulsifiers are fatty alcohol polyoxyethylene ether fatty acid ester and TX-10; and the nano thermal conductor is nano copper.

2. The water-soluble stainless steel sheet rolling oil according to claim 1, characterized in that: Based on the total mass of the emulsifier, the ratio of fatty alcohol polyoxyethylene ether fatty acid ester to TX-10 is 1.1-1.3:

1.

3. The water-soluble stainless steel sheet 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.

4. The water-soluble stainless steel sheet rolling oil according to claim 3, characterized in that: The antioxidant may be selected from one or more of diphenylamine, p-phenylenediamine, alkylated diphenylamine, 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butylphenol, and alkylbiscyclohexylcresol.

5. The water-soluble stainless steel sheet rolling oil according to claim 1, characterized in that: The extreme pressure anti-wear agent is sulfided fatty acid methyl ester: oleyl alcohol phosphate and molybdenum dithiophosphate. Based on the total mass of the extreme pressure anti-wear agent, the ratio of sulfided fatty acid methyl ester: oleyl alcohol phosphate: molybdenum dithiophosphate is 1: (1.2-1.3): (1.3-1.4).

6. The water-soluble stainless steel sheet rolling oil according to claim 1, characterized in that: The rust inhibitor is benzotriazole.

7. A method for preparing a water-soluble stainless steel sheet rolling oil, comprising preparing the water-soluble stainless steel sheet rolling oil as claimed in any one of claims 1 to 6, characterized in that: The method comprises: S1, a pre-dispersion step, adding base oil into a container, stirring at 60-70°C until the solution is clear, then adding a nano thermal conductor and dispersing and mixing by ultrasonic wave; S2. Add antioxidant, compatibilizer, synthetic ester, emulsifier, extreme pressure anti-wear agent and rust inhibitor in sequence, and perform ultrasonic dispersion and mechanical stirring at a temperature of 50-57°C to obtain water-soluble stainless steel thin material rolling oil.

8. The method for preparing the water-soluble stainless steel sheet rolling oil according to claim 7, characterized in that: S1, pre-dispersion step, ultrasonic dispersion and mixing with an ultrasonic frequency of 40-60kHz and an ultrasonic power of 730-860W; S2: Ultrasonic dispersion combined with mechanical stirring, ultrasonic frequency 61-75kHz, ultrasonic power 730-860W.

9. A method for using a water-soluble stainless steel sheet rolling oil, comprising preparing the water-soluble stainless steel sheet rolling oil according to any one of claims 1 to 6 using the preparation method according to any one of claims 7 to 8, characterized in that: The method includes: S1. preparing a water-soluble stainless steel sheet rolling oil into an emulsion in which the mass of the water-soluble stainless steel sheet rolling oil accounts for 2-5%; S2, using stainless steel strip with thickness of 3-6mm and width of 1000-1600mm, adopting five-stand cold rolling process, rolling into stainless steel strip with thickness of 0.3-0.8mm through five passes, wherein the cold rolling process includes: the surface roughness of the roller of the first stand is 0.7-0.8μm, the surface roughness of the roller of the second stand is 0.5-0.6μm; the reduction rate of the first two passes is 28-34%, and the emulsion quality is 100-150%. The concentration is 3-5%, the flow rate of the emulsion is 4300-4600L / min, and the rolling speed is 91-110m / min; the surface roughness of the rolls of the 3rd-4th stands is 0.3-0.5μm; the surface roughness of the rolls of the 5th stand is 0.1-0.3μm; the mass concentration of the emulsion is 2-3%, the flow rate of the emulsion is 4800-5300L / min, and the rolling speed is 115-130m / min.

10. The method for using the water-soluble stainless steel sheet rolling oil according to claim 9, characterized in that: The stainless steel strip is 316 stainless steel. After continuous rolling, the thickness deviation of the stainless steel thin material is less than 0.02mm, the roughness is less than 0.1μm, and the surface reflectivity after annealing is more than 93%.