High-cleanliness lubricating type continuous annealing line leveling liquid and preparation method thereof

Abstract

The invention relates to the technical field of leveling processes, and discloses a high-cleanliness lubricating type continuous annealing line leveling liquid and a preparation method thereof. The high-cleanliness lubricating type continuous annealing line leveling liquid comprises the following components in percentage by mass: 21%-30% of an antirust agent, 2%-3% of a lubricant, 2%-5% of a pH regulator, 3%-5% of a cleaning agent and the balance of water. According to the high-cleanliness lubricating type continuous annealing line leveling liquid provided by the invention, the cleanliness of the leveling liquid is optimized, and the cationic surfactant and the nonionic surfactant are compounded to generate an additive synergistic effect, so that the surface tension of the leveling liquid is greatly reduced, and the dispersity of the iron powder is optimized; in the application, the surface cleanliness of strip steel is improved (residual iron is reduced), the cleanliness of a rolling mill housing is kept, the problem that most leveling liquid in the current market easily blocks a nozzle and a roller hole is solved, and the leveling liquid is widely applied to a continuous annealing production line.

Description

Technical Field

[0001] The present application relates to the technical field of leveling technology, and mainly to a high-cleanliness lubricating continuous-recessing line leveling fluid and a preparation method thereof. Background Art

[0002] Leveling is a process technology that further rolls cold-rolled steel sheets after continuous or hood annealing to achieve the target elongation of the steel sheets. Currently, there are two main methods in this process: dry leveling and wet leveling. The wet leveling process is being gradually promoted and used because of its low dust and the special morphology and matte color of the treated steel sheet surface. Usually, the steel sheet after wet leveling is directly used as a coating substrate for tin plating or chrome plating, which puts forward direct requirements for the rust resistance of the steel sheet after leveling. However, the annealed substrate has high surface activity and fast corrosion rate, and it is necessary to use processing media to improve the surface rust resistance. Considering efficient production and cost savings, it is most economical and feasible to solve the rust resistance of the substrate with the help of the leveling liquid in the wet leveling process.

[0003] The process flow of the continuous annealing line is characterized by continuous production, high production efficiency, and the ability to meet the needs of mass production; while the working principle of the leveling machine is to achieve a flat effect of the strip or plate through the extrusion of the upper and lower rollers. Specifically, the leveling machine is composed of a working mechanism consisting of two upper and lower rollers, in which the rollers are covered with frosted belts. During operation, the plate is ground by the frosted belts to achieve deburring and flattening. If the roller gap is too tight, the roller press cannot accurately press the material or sheet during operation, resulting in unsatisfactory working results. Moreover, in the current leveling process, the plate track and roller track of the leveling machine unit must be implemented in accordance with the clean production regulations. The leveling liquid nozzle must be checked before production, and the emulsion nozzle in the middle of the strip must not be blocked; the leveling liquid must be sprayed in a fan-shaped state to the upper and lower working roller gaps without clogging. Therefore, as a qualified leveling liquid, on the one hand, the leveling liquid needs to have appropriate lubrication performance and friction coefficient to ensure high-speed and stable rolling of the steel strip and reduce the wear of the steel plate and the roller; on the other hand, it also needs to have excellent cleaning performance to improve the surface cleanliness of the steel plate.

[0004] At present, some leveling liquids have been disclosed. For example, Chinese invention patent CN114480007A describes a wet leveling liquid using boric acid ester and boric acid salt as composite rust inhibitors; Chinese invention patent CN102286749A introduces a wet leveling liquid using organic acid and organic amine compound to achieve rust prevention effect; Chinese invention patent CN102199478A discloses a method for preparing an anti-yellowing, environmentally friendly wet leveling liquid. However, so far, none of the wet leveling liquid patents reported have optimized their cleaning performance, and the use of the wet leveling process is limited. Moreover, the existing wet leveling liquids available on the market generally pay more attention to their anti-rust performance, ignoring the cleanliness of the rolling mill machine. During the application process, in order to ensure lubricity, phosphate-type substances that are easy to remain are added. However, after a period of use, the roller press is prone to clogging the nozzle and roller hole, resulting in the roller gap being too tight. If the leveling liquid is not self-cleaning enough, it will be mixed with iron powder and remain in the roller hole, and the roller hole will be blocked, resulting in the roller gap being unable to open, affecting the normal operation of the machine, greatly reducing production efficiency or failing to meet the needs of mass production of the continuous annealing line. Therefore, in order to solve this problem, workers often need to frequently clean and maintain the roller holes, and shutdown cleaning greatly reduces the working efficiency of the continuous annealing production line. Therefore, in order to reduce the occurrence of roller hole blockage, it is necessary to provide a method for preparing a high-cleaning lubrication type leveling liquid suitable for continuous annealing lines, and study its performance to meet the requirements of leveling processing. Therefore, the existing technology still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a high-cleaning lubricating continuous withdrawal line leveling fluid and a preparation method thereof, aiming to solve the problem of insufficient cleaning performance of the existing leveling fluid.

[0006] The technical solution of this application is as follows: In a first aspect, the present application provides a high-cleaning lubricating continuous-recessing line leveling fluid, which comprises the following components, calculated by mass percentage: Rust inhibitor 21%-30%, lubricant 2-3%, pH adjuster 2-5%, cleaning agent 3-5%, and water as the balance.

[0007] Furthermore, the rust inhibitor is one or more of a rust inhibitor of ethanolamine and acid, a polyol ester rust inhibitor, a self-assembled rust inhibitor, a silane coupling rust inhibitor, and a vapor phase rust-proofing agent.

[0008] Furthermore, the rust inhibitor is a rust inhibitor compounded with ethanolamine and acid, and the mass ratio of the ethanolamine to the acid is 7:4.

[0009] Furthermore, the ethanolamine is a combination of monoethanolamine and triethanolamine, and the mass ratio of monoethanolamine to triethanolamine is 1:1; The acid is a combination of dibasic acid C21 and mixed dibasic acid GM1, and the mass ratio of the dibasic acid C21 to the mixed dibasic acid GM1 is 5:3.

[0010] Furthermore, the cleaning agent is a combination of tallow amine polyoxyethylene ether T05 and polyether L-62, and the mass ratio of tallow amine polyoxyethylene ether T05 to polyether L-62 is 1:2.

[0011] Furthermore, the pH adjuster is boric acid.

[0012] Furthermore, the lubricant is one of fatty alcohol ether phosphate MOA-3P, phosphate ester NP-10, and neodecanoic acid 685-2.

[0013] Furthermore, the lubricant is phosphate ester NP-10.

[0014] In a second aspect, the present application further provides a method for preparing the high-cleaning lubricating continuous-recessing line leveling fluid according to the first aspect, which comprises the following steps: At 35-45° C., the rust inhibitor, cleaning agent, lubricant, pH adjuster and water are sequentially added into the container in proportion and stirred. After stirring for 1-2 hours, stirring and heating are stopped to obtain the high-cleaning lubricating continuous-recessing line leveling liquid.

[0015] Furthermore, after stopping stirring and heating, the mixture is allowed to stand for 1-2 hours.

[0016] Beneficial effects: In the high-cleanliness lubricating continuous annealing line leveling fluid provided in the present application, the cleanliness of the leveling fluid is optimized, and the cationic surfactant and the non-ionic surfactant are compounded to produce an additive and synergistic effect, which greatly reduces the surface tension of the leveling fluid and optimizes the dispersibility of the iron powder. This is beneficial to improving the surface cleanliness of the strip (reducing residual iron) and maintaining the cleanliness of the rolling mill arch in application, solving the problem that most leveling fluids on the market are prone to clogging nozzles and roller holes, and making it widely used in continuous annealing production lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 These are the iron powder dispersibility test results of Example 1, Example 2, Example 3, Example 4, Comparative Example 1-1, Comparative Example 1-2 and Comparative Example 1-3 of the present application.

[0018] Figure 2 These are the iron powder dispersibility test results of Example 1, Example 5, Example 6 and Comparative Example 2-1 of the present application.

[0019] Figure 3 This is the iron powder dispersibility test result of Example 1 of the present application, an imported brand of leveling fluid and a domestic brand of leveling fluid. DETAILED DESCRIPTION

[0020] The present application provides a clean lubricating continuous retreat line leveling fluid and a preparation method thereof. To make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] The present application provides a high-cleaning lubricating continuous-recessing line leveling fluid, which comprises the following components, calculated by mass percentage: Rust inhibitor 21%-30%, lubricant 2-3%, pH adjuster 2-5%, cleaning agent 3-5%, and water as the balance.

[0022] In the high-cleanliness lubricating continuous annealing line leveling fluid provided in the present application, the cleanliness of the leveling fluid is optimized, and the cationic surfactant and the non-ionic surfactant are compounded to produce an additive and synergistic effect, which greatly reduces the surface tension of the leveling fluid and optimizes the dispersibility of the iron powder. This is beneficial in application to improving the surface cleanliness of the strip (reducing residual iron) and maintaining the cleanliness of the rolling mill arch, solving the problem that most of the leveling fluids currently on the market are prone to clogging the nozzles and roller holes, and making it widely used in continuous annealing production lines.

[0023] Specifically, the high-cleaning lubricating type continuous retreat line leveling liquid provided in this application is used as a stock liquid, which needs to be diluted with water before use in actual use, and the mass proportion of the stock liquid in the diluted liquid is 1-5%. Among them, deionized water can be used.

[0024] Furthermore, the rust inhibitor is one or more of ethanolamine and acid compound rust inhibitor, polyol ester rust inhibitor, self-assembled rust inhibitor, silane coupling rust inhibitor, and vapor phase rust-proof water. Specifically, the wet leveling liquid needs water as a carrier for dilution, but the presence of water is the main cause of metal corrosion, so more rust inhibitors need to be added to the wet leveling liquid stock solution to meet the rust prevention requirements. The selected ethanolamine and acid compound rust inhibitor, polyol ester rust inhibitor, self-assembled rust inhibitor, silane coupling rust inhibitor, and vapor phase rust-proof water are environmentally friendly water-based rust inhibitors with excellent metal rust prevention effects.

[0025] Preferably, the rust inhibitor is a rust inhibitor combination of ethanolamine and acid, and the mass ratio of ethanolamine to acid is 7:4. Studies have shown that rust resistance is related to the length of the molecular alkane chain, the type and number of polar groups in the molecule, and in this application, the ethanolamine in the preferred rust inhibitor combination can be compounded with a dibasic acid to form an organic carboxylic acid alcoholamine salt, which can make steel products rust-proof for 48 hours at a relatively low concentration.

[0026] More specifically, the ethanolamine is a combination of monoethanolamine and triethanolamine, and the mass ratio of monoethanolamine and triethanolamine is 1:1, and the acid is a combination of a dibasic acid and a mixed dibasic acid, and the mass ratio of the dibasic acid and the mixed dibasic acid is 5:3. Wherein, the dibasic acid can be dibasic acid C21, and the mixed dibasic acid can be mixed dibasic acid GM1. In the present application, monoethanolamine, triethanolamine, dibasic acid and mixed dibasic acid are compounded and used, and monoethanolamine and triethanolamine will react with the carboxyl groups in the dibasic acid and the mixed dibasic acid to form an amide, which is also a very effective rust inhibitor, wherein a very dilute alkyl alcohol amide is formed, which can prevent steel from rusting at a relatively low content, and has good hydrolysis resistance, and at the same time has a thickening effect on the rust-proof water, thereby avoiding the rust inhibitor from being lost from the metal surface, and making the rust inhibitor firmly adhere to the metal surface. Moreover, the nitrogen and oxygen atoms in the generated organic carboxylic acid alcohol amine salts and alkyl alcohol amide molecules have lone pairs of electrons, which can react with metal surfaces with empty orbits such as iron to form complex films, preventing molecules such as oxygen and water from contacting the metal surface, further ensuring the anti-rust effect.

[0027] Specifically, the working principle of the surface treatment cleaning agent is to adsorb and disperse the surface dirt through the chemical substances such as surfactants in its ingredients, so that it is separated from the surface and forms a foam or suspension. Finally, the dirt on the surface of the object is thoroughly cleaned by flushing or suction of the cleaning liquid. The water-based cleaning agent in the leveling liquid is mainly composed of surfactants and cleaning aids. Most of the cleaning agents of wet leveling liquids on the market are mainly non-ionic surfactants with strong cleaning ability, but using only one non-ionic surfactant is still insufficient for the dispersion of iron powder.

[0028] In view of this problem, further, the cleaning agent is a combination of tallow amine polyoxyethylene ether T05 and polyether L-62, and the mass ratio of tallow amine polyoxyethylene ether T05 and polyether L-62 is 1:2. In the present application, by selecting a non-ionic surfactant and a cationic surfactant for compounding, under the same amount of added rust inhibitor, lubricant and pH adjuster, while ensuring high lubricity, the cleaning performance is stronger than that of a single surfactant, which can not only improve the cleanliness of the steel plate, but also effectively remove the residual substances in the roller gap. Among them, tallow amine polyoxyethylene ether T05 is a cationic surfactant obtained by polymerization of tallow amine and a relatively low amount of ethylene oxide. The surface tension of the low EO number tallow amine polyoxyethylene ether T05 is low, and the surface tension reduction effect on the leveling liquid diluent is strong, thereby improving the dispersibility of the iron powder. Polyether L-62 is a nonionic surfactant. After tallow amine polyoxyethylene ether T05 and polyether L-62 are compounded in the provided ratio, the surface tension of the mixed micelles of the compounded system at the critical micelle concentration is lower than the single action of either one, resulting in a positive additive synergistic effect. This is the result of the interaction between the ionic groups of tallow amine polyoxyethylene ether T05 and the polar polyoxyethylene groups of polyether L-62, which is beneficial to further improve the dispersibility and cleaning performance of the leveling liquid.

[0029] Furthermore, the pH regulator is boric acid. Specifically, since iron hydroxide is insoluble in alkaline solutions, a thin protective film can be formed on the metal surface, which makes the corrosion rate of the steel plate in alkaline solutions slower than in acidic solutions, and alkaline solutions are more conducive to the degreasing and cleaning of the strip surface. Therefore, the leveling liquid is mostly an alkaline solution. However, the alkalinity of the wet leveling liquid should not be too high, because too high a pH value not only damages human skin and is detrimental to the ecological environment, but also corrodes the plated metal. The present application adopts a certain amount of boric acid as a pH regulator for the wet leveling liquid to adjust the pH value within a suitable range. The selected boric acid, as a weak acid, has less harm to human skin and the environment, and also has certain anti-corrosion properties, and can be well used in leveling processing.

[0030] Specifically, during the cold-rolled steel plate flattening process, a rolling process with a reduction rate of 0.3% to 3.0% is generally accompanied, and some cold-hardened steel plates require a larger reduction rate to maintain flatness. Therefore, the introduction of appropriate water-soluble lubricants in the wet flattening liquid formula can make the flattening liquid have suitable lubricating properties, reduce the rolling force of the rollers, reduce roller wear, and enable the steel plate surface to obtain a stable and uniform elongation, thereby preventing over-lubrication and slipping. Preferably, the lubricant is one of fatty alcohol ether phosphate MOA-3P, phosphate ester NP-10, and neodecanoic acid 685-2. Neodecanoic acid can generally be used in metal extractants, lubricating oils, and cosmetics. Moreover, as an effective metal extractant, it can also be used as a synthetic ester lubricant. The present application uses neodecanoic acid 685-2 as a lubricant. Due to the highly branched structural properties of tertiary carbonization on the α-carbon, it has better hydrolysis resistance and corrosion resistance than the linear secondary carbon structure. The selected fatty alcohol ether phosphate MOA-3P and phosphate ester NP-10 have excellent water solubility, decontamination, emulsification, lubrication, cleaning, dispersion, antistatic and rust prevention properties, excellent electrolyte compatibility, and stability to heat and alkali. They are resistant to acid, alkali, hard water, inorganic salts, and high temperatures, and have good biodegradability, low irritation, and strong degreasing power.

[0031] Preferably, the lubricant is phosphate ester NP-10. Specifically, most phosphate esters currently on the market are prone to residue, have poor detergency, and fail to meet high cleanliness requirements. This application explores and examines the amount and type of phosphate ester added to this problem, and then preferably uses phosphate ester NP-10. The preferred phosphate ester NP-10 is anionic, and can obtain higher activity and stability in a system environment where the pH value of the working liquid (diluent) of the leveling fluid of this application is 9-10, which is in line with the pH range of this product, and by controlling the addition amount of phosphate ester NP-10 at 2-3%, both lubricity and high cleanliness of the leveling fluid can be guaranteed. Among them, phosphate ester NP-10 exceeding the recommended addition amount is likely to cause residue, affecting the cleanliness of the leveling fluid, and below the recommended addition amount, it cannot guarantee sufficient lubrication.

[0032] In the high-cleanliness lubricating continuous annealing line leveling fluid provided in the present application, the cleanliness of the leveling fluid is optimized, and the cationic surfactant and the non-ionic surfactant are compounded to produce an additive and synergistic effect, which greatly reduces the surface tension of the leveling fluid and optimizes the dispersibility of the iron powder. This is beneficial in application to improving the surface cleanliness of the strip (reducing residual iron) and maintaining the cleanliness of the rolling mill arch, solving the problem that most of the leveling fluids currently on the market are prone to clogging the nozzles and roller holes, and making it widely used in continuous annealing production lines.

[0033] The present application also provides a method for preparing the high-cleaning lubricating type continuous stripping line leveling fluid as described above, which comprises the following steps: At 35-45°C, add rust inhibitor, cleaning agent, lubricant, pH adjuster and water into the container in proportion and stir in sequence. After stirring for 1-2 hours, stop stirring and heating to obtain a high-cleaning lubricating continuous retreat line leveling liquid.

[0034] The container may be a water bath pot, and the obtained high-cleanliness lubricating continuous-recessing line leveling liquid has a transparent light yellow liquid appearance.

[0035] Furthermore, after stopping stirring and heating, the mixture is allowed to stand for 1-2 hours. The compatibility can be improved by standing and cooling, which is beneficial to improving the stability of the obtained high-cleanliness lubricating continuous-recessing line leveling liquid.

[0036] The invention is further described below by means of specific examples.

[0037] 1. The sources of some raw materials in the examples of this application are as follows: Monoethanolamine: Junyan New Materials Technology (Shanghai) Co., Ltd.; Triethanolamine: Tianjin Yitaicheng Chemical Technology Co., Ltd.; Dibasic acid C21: Guangzhou Miqi Chemical Co., Ltd.; Mixed dibasic acid GM1: Shandong Cathay Biotechnology Materials Co., Ltd.; Boric acid: Tianjin Haoruisen Chemical Trading Co., Ltd.; Polyether L-62: Sangda Chemical Co., Ltd. PE6100: SEDAR Chemical Co., Ltd. Tallow amine polyoxyethylene ether T10: Shanghai Wenpu Chemical Technology Co., Ltd.; Tallow amine polyoxyethylene ether T05: Shanghai Wenpu Chemical Technology Co., Ltd.; Fatty alcohol ether phosphate MOA-3P: Hai'an Petrochemical Plant, Jiangsu Province; Phosphate ester NP-10: Xingtai Xinlanxing Technology Co., Ltd.; Neodecanoic acid 685-2: Guangzhou Fufei Chemical Technology Co., Ltd.

[0038] 2. The preparation method of the high-cleaning lubricating type continuous withdrawal line leveling fluid in the embodiment of the present application comprises the following steps: The water bath was heated to 40°C, and rust preventive, cleaning agent, lubricant, pH adjuster and water were added in order according to the ratio, and stirring was stopped after 2 hours of stirring and heating, and the high-cleaning lubricating continuous annealing line leveling liquid of each embodiment was obtained after standing for 1.5 hours. The obtained high-cleaning lubricating continuous annealing line leveling liquid all had a transparent light yellow liquid appearance.

[0039] 3. Testing method of the embodiments of the present application.

[0040] The test objects of this application are the high-cleaning lubricating type continuous withdrawal line leveling fluids in the embodiments: (1) Appearance: measured by visual inspection.

[0041] (2) Lubrication performance test method: According to GB / T 3142 "Lubricant load-bearing capacity test method (four-ball method)", the pB value of the sample stock solution is measured, and the quality of the sample's lubrication performance is judged by the pB value. Tester model: Xiamen Tianji MS-10A.

[0042] (3) The surface tension was tested using the OCA15EC video optical contact angle measuring instrument developed by Dataphysics of Germany.

[0043] (4) Test method for the dispersion performance of iron powder: dilute the original solution of leveling liquid with deionized water to a concentration of 5%, take 100 ml of the solution into a stoppered measuring cylinder, add 2 g of iron powder, shake up and down for 30 seconds (about 60 times), and observe the dispersion of the iron powder.

[0044] (5) The cleaning performance test is based on JB / T 4323.2-1999 "Test Methods for Water-Based Metal Cleaners", and the cleaning efficiency of the leveling fluid dilution is determined by the oil washing rate.

[0045] (6) Rust resistance test method: wash 2g of rust-free cast iron filings twice with No. 120 solvent gasoline, drain and quickly blow dry with hot air, then evenly spread them on a culture dish with a filter paper with a 30mm×30mm grid in the middle on the bottom. Use a pipette to draw the test solution (1%, 3%, 5% concentration leveling solution dilution) and evenly sprinkle it on the iron filings, cover the culture dish lid, leave it at room temperature for 72 hours to observe the rust of the iron filings, then quickly rinse the iron filings on the filter paper with tap water, dry the filter paper, and observe the rust on the filter paper.

[0046] By adopting the above preparation method, the leveling liquids of Example 1, Example 2, Example 3, Example 4, Comparative Example 1-1, Comparative Example 1-2 and Comparative Example 1-3 were prepared respectively according to the component ratio in Table 1, and the component ratio is shown in Table 1: Table 1 Example 1 Example 2 Example 3 Example 4 Comparative Example 1-1 Comparative Example 1-2 Comparative Examples 1-3 Monoethanolamine 7% 7% 7% 7% 3.5% 7% 7% Triethanolamine 7% 7% 7% 7% 7% 7% 7% Dibasic acid C21 5% 5% 5% 5% 5% 5% 5% Mixed dibasic acid GM1 3% 2% 3% 3% 3% 3% 3% Boric acid 3% 3% 3% 3% 2% 3% 3% PE6100 - - 3% - - 3% - Polyether L-62 3% 3% - 3% 3% - 3% Neodecanoic acid 685-2 - - 3% - - 3% - Fatty alcohol ether phosphate MOA-3P - - - 2% - - 2% Phosphate NP-10 2% 2% - - 2% - - Tallow amine polyoxyethylene ether T05 1.5% 1.5% 1.5% - 1.5% 3% - Tallow amine polyoxyethylene ether T10 - - - 1.5% - - 3% water 68.5% 69.5% 67.5% 68.5% 73% 66% 67% The basic performance index tests were performed on Example 1, Example 2, Example 3, Example 4, Comparative Example 1-1, Comparative Example 1-2 and Comparative Example 1-3. B , surface tension and cleaning properties were tested with the original solution, and the anti-rust property was tested by diluting the solution to 5%, 3%, and 1% by mass, respectively. The test results are shown in Table 2: Table 2 Test items Example 1 Example 2 Example 3 Example 4 Comparative Example 1-1 Comparative Example 1-2 Comparative Examples 1-3 <![CDATA[P B ,Kg]]> 40 40 40 40 40 40 40 Surface tension, mN / m 5.2 5.2 5.4 10.1 5.3 5.5 10.9 Cleaning property (oil washing rate), % 98.8 94.3 96.5 93.1 95.5 96.5 92.2 Rust resistance (5% dilution, 72h) Rust-free Rust-free Rust-free Rust-free Rust Rust-free Rust-free Rust resistance (3% dilution, 72h) Rust-free Rust Rust-free Rust-free Rust Rust-free Rust-free Rust resistance (1% dilution, 72h) Rust-free Rust Rust-free Rust-free Rust Rust-free Rust-free The test results of Example 1, Example 2 and Comparative Example 1-1 show that reducing the compounding ratio of organic acid and organic base has a greater impact on the anti-rust performance of the leveling liquid system. Therefore, preferably, the compounding ratio of organic base and organic acid in the rust inhibitor is 7:4; The test results of Example 1, Example 3 and Comparative Examples 1-2 illustrate that: (1) Using phosphate ester NP-10 and neodecanoic acid 685-2 as lubricants for the leveling fluid can achieve excellent lubrication performance in the system. However, under the condition that PB is 40 kg, the addition amount of phosphate ester NP-10 is lower than that of neodecanoic acid 685-2. Therefore, preferably, phosphate ester NP-10 is selected as the lubricant in the system; (2) By selecting different cationic and non-ionic compounding agents, it can be found that the surface cleaner compounded with T05 and PE6100 and the surface cleaner compounded with T05 and polyether L-62 have excellent cleaning performance, but the cleaning performance of the surface cleaner compounded with T05 and polyether L-62 is slightly better than that of the surface cleaner compounded with T05 and PE6100. At the same time, it is found that increasing the amount of T05 compounded does not significantly improve the cleaning performance. Therefore, preferably, a surface cleaner compounded with T05 and polyether L-62 is selected in the system, and the compounding ratio is 1:2; The test results of Example 1, Example 4 and Comparative Examples 1-3 illustrate that: (1) Phosphate ester NP-10 or neodecanoic acid 685-2 or fatty alcohol ether phosphate ester MOA-3P is selected as the lubricant of the leveling liquid, and excellent lubrication performance can be achieved in the system; (2) By comparison, it is found that the cleaning performance of the surface cleaner compounded with T05 and polyether L-62 and the surface cleaner compounded with T10 and polyether L-62 are quite different, which proves that the tallow amine polyoxyethylene ether with low EO number has low surface tension, strong ability to reduce the surface tension of the leveling liquid diluent, and good iron powder dispersibility. Therefore, it is preferred to use a surface cleaner compounded with T05 and polyether L-62.

[0047] The iron powder dispersibility test results of Example 1, Example 2, Example 3, Example 4, Comparative Example 1-1, Comparative Example 1-2 and Comparative Example 1-3 are as follows: Figure 1 As shown (from left to right are Example 1, Comparative Example 1-1, Example 2, Comparative Example 1-2, Example 3, Comparative Example 1-3, Example 4), by comparing the test results, it can be seen that Example 1 uses a surface cleaning agent compounded with a cationic surfactant and a non-ionic surfactant for the leveling liquid, the emulsion iron powder has good dispersibility, and the iron powder is dispersed more evenly.

[0048] By adopting the above preparation method, the leveling liquids of Example 1, Example 5, Example 6 and Comparative Example 2-1 were prepared respectively according to the component ratios in Table 3. The component ratios are shown in Table 3: Table 3 Example 1 Example 5 Example 6 Comparative Example 2-1 Monoethanolamine 7% 7% 7% 7% Triethanolamine 7% 7% 7% 7% Dibasic acid C21 5% 5% 5% 5% Mixed dibasic acid GM1 3% 3% 3% 3% Boric acid 3% 3% 3% 3% PE6100 - 4.5% - 3% Polyether L-62 3% - 4.5% 3% Phosphate NP-10 2% 2% 2% 2% Tallow amine polyoxyethylene ether T05 1.5% - - - Tallow amine polyoxyethylene ether T10 - - - - water 68.5% 68.5% 68.5% 67% The basic performance index test results of the stock solutions of Example 1, Example 5, Example 6 and Comparative Example 2-1 are shown in Table 4: Table 4 Test items Example 1 Example 5 Example 6 Comparative Example 2-1 Surface tension, mN / m 5.2 15.3 12.5 10.4 Cleaning property (oil washing rate), % 98.8 90.5 91.1 94.5 The iron powder dispersibility test results of Example 1, Example 5, Example 6 and Comparative Example 2-1 are as follows: Figure 2 As shown (from left to right are Example 1, Example 5, Example 6 and Comparative Example 2-1). The test results of the basic performance indicators of Example 1, Example 5, Example 6 and Comparative Example 2-1 are as follows: (1) In terms of surface tension test results, the effect of reducing surface tension by using a single non-ionic surfactant and a compound non-ionic surfactant is not as good as using T05, a cationic surfactant with a low EO number, in combination with a non-ionic surfactant for the leveling liquid; (2) In terms of cleaning performance, the surface tension of the leveling liquid directly affects the cleaning performance. The lower the surface tension, the better the cleaning performance of the leveling liquid; (3) In terms of iron powder dispersion performance, the iron powder of Example 1 with a small surface tension is more evenly dispersed than that of Example 5, Example 6 and Comparative Example 2-1.

[0049] The basic performance indexes of Example 1, an imported brand of leveling fluid and a domestic brand of leveling fluid were tested. B , surface tension and cleaning properties were tested with the original solution, and the anti-rust property was tested by diluting the solution to 5%, 3%, and 1% by mass, respectively. The test results are shown in Table 5: Table 5 Test items Example 1 An imported brand of leveling fluid A domestic brand of leveling fluid <![CDATA[P B ,Kg]]> 40 30 26 Surface tension, mN / m 5.2 12.9 20.1 Cleaning property (oil washing rate), % 98.8 89.5 77 Rust resistance (5% dilution, 72h) Rust-free Rust-free Rust-free Rust resistance (3% dilution, 72h) Rust-free Rust-free Rust-free Rust resistance (1% dilution, 72h) Rust-free Rust-free Rust-free The iron powder dispersibility test results of Example 1, an imported brand of leveling fluid, and a domestic brand of leveling fluid are as follows: Figure 3 As shown (from left to right, respectively, Example 1, a domestic brand leveling liquid, and an imported brand leveling liquid). The test results of Example 1, an imported brand leveling liquid, and a domestic brand leveling liquid illustrate that: as an international brand, a certain imported brand uses a single surface cleaning agent with high surface tension, and its lubricity and cleanliness are slightly inferior to the leveling liquid of the present invention, while a domestic brand leveling liquid also uses a single surface cleaning agent, and its cleanliness, lubricity, and iron filings dispersibility are far lower than those of the present invention. The present application uses a cleaning agent compounded with a low EO number cationic surfactant and a non-ionic surfactant, which can greatly improve the cleanliness of the leveling liquid, effectively reduce and remove residues that clog the nozzles and roller holes, improve production efficiency, and meet the needs of mass production of continuous annealing lines.

[0050] The high-cleaning lubricating continuous annealing line leveling fluid provided in the embodiments of the present application optimizes the cleanliness, and compounding of cationic surfactants with low EO numbers with non-ionic surfactants produces an additive and synergistic effect, forming a new type of surface treatment cleaning agent, which greatly reduces the surface tension of the leveling fluid and optimizes the dispersibility of iron powder, which is beneficial to improving the surface cleanliness of the strip (reducing residual iron) and maintaining the cleanliness of the rolling mill arch in application, and can solve the problem that most leveling fluids currently on the market are prone to clogging nozzles and roller holes, and can be widely used in continuous annealing production lines.

[0051] It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description, and all these improvements and changes should fall within the scope of protection of the present application.

Claims

1. A high-cleaning lubricating continuous withdrawal line leveling fluid, characterized in that: Calculated by mass percentage, it includes the following components: Rust inhibitor 21%-30%, lubricant 2-3%, pH adjuster 2-5%, cleaning agent 3-5%, and water as the balance.

2. The high-cleanability lubricating type continuous withdrawal line leveling fluid according to claim 1, characterized in that: The rust inhibitor is one or more of a rust inhibitor of ethanolamine and acid, a polyol ester rust inhibitor, a self-assembly rust inhibitor, a silane coupling rust inhibitor, and a vapor phase rust inhibitor.

3. The high-cleanability lubricating type continuous withdrawal line leveling fluid according to claim 2, characterized in that: The rust inhibitor is a rust inhibitor compounded with ethanolamine and acid, and the mass ratio of the ethanolamine to the acid is 7:

4.

4. The high-cleanability lubricating type continuous shaving line leveling fluid according to claim 3, characterized in that: The ethanolamine is a combination of monoethanolamine and triethanolamine, and the mass ratio of the monoethanolamine to the triethanolamine is 1:1; The acid is a combination of dibasic acid C21 and mixed dibasic acid GM1, and the mass ratio of the dibasic acid C21 to the mixed dibasic acid GM1 is 5:

3.

5. The high-cleanability lubricating type continuous shaving line leveling fluid according to claim 1, characterized in that: The cleaning agent is a combination of tallow amine polyoxyethylene ether T05 and polyether L-62, and the mass ratio of the tallow amine polyoxyethylene ether T05 and polyether L-62 is 1:

2.

6. The high-cleanability lubricating type continuous shaving line leveling fluid according to claim 1, characterized in that: The pH adjuster is boric acid.

7. The high-cleanability lubricating type continuous shaving line leveling fluid according to claim 1, characterized in that: The lubricant is one of fatty alcohol ether phosphate MOA-3P, phosphate ester NP-10, and neodecanoic acid 685-2.

8. The high-cleanability lubricating type continuous shaving line leveling fluid according to claim 7, characterized in that: The lubricant is phosphate ester NP-10.

9. A method for preparing a high-cleaning lubricating continuous-recessing line leveling fluid as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: At 35-45° C., the rust inhibitor, cleaning agent, lubricant, pH adjuster and water are sequentially added into the container in proportion and stirred. After stirring for 1-2 hours, stirring and heating are stopped to obtain the high-cleaning lubricating continuous-recessing line leveling liquid.

10. The method for preparing the high-cleaning lubricating type continuous stripping line leveling fluid according to claim 9, characterized in that: Stop stirring and heating and let stand for 1-2 hours.

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