High-lubrication high-dispersity water-based steel cold rolling liquid and preparation method thereof

Abstract

The invention provides a high-lubrication and high-dispersity water-based steel cold rolling liquid and a preparation method thereof.The high-lubrication and high-dispersity water-based steel cold rolling liquid comprises base oil, a compound emulsifier, an extreme pressure agent, an antioxidant and deionized water, and the compound emulsifier is composed of Span-60, lauryl sodium sulfate and a cosolvent n-butyl alcohol. According to the invention, the composite emulsifier with specific components is added into the water-based steel cold rolling liquid, and a specific pre-compounding process of the composite emulsifier and the extreme pressure agent and a microemulsion and dynamic emulsification process of the rolling liquid are carried out; the finally obtained rolling liquid has better lubricating property (the surface roughness Ra is less than or equal to 0.085 mu m) and good dispersing property (the rolling liquid can be kept free of sedimentation and oil phase precipitation after standing for 30 days).

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lubricating and cooling materials for metal processing, in particular to a high-lubricating and high-dispersible water-based rolling liquid suitable for steel cold rolling process and a preparation method thereof. BACKGROUND

[0002] In the steel cold rolling process, the rolling liquid as the core functional material directly affects the surface quality, dimensional accuracy and production efficiency of the strip steel. The current mainstream product of rolling liquid is mainly water-based emulsified rolling liquid, which usually contains base oil, emulsifier, lubricant, extreme pressure agent, antirust agent, preservative and water.

[0003] Compared with traditional oil-based rolling liquid, water-based steel cold rolling liquid has many advantages. From the safety point of view, compared with oil-based rolling liquid, water-based rolling liquid is not flammable and explosive, which greatly reduces the risk of fire and explosion in the production site, providing a strong guarantee for safety production. In terms of cooling performance, water has high specific heat capacity and high thermal conductivity, so that water-based rolling liquid can quickly and effectively absorb and take away a large amount of heat generated during rolling, avoid deformation of the roller and steel due to high temperature, and be beneficial to maintain the accuracy of rolling size and the mechanical properties of steel. In addition, the cost of water-based rolling liquid is relatively low, and in the discharge treatment, compared with oil-based rolling liquid, it is easier to carry out environmental protection treatment, which meets the trend of modern industrial green development. At the same time, it has good cleaning property, and the surface of the rolled steel has less residue, reducing the workload of subsequent cleaning process. However, the existing water-based steel cold rolling liquid still has some obvious shortcomings. In terms of lubrication performance, under the conditions of high speed and large reduction of cold rolling process, its lubrication performance is often difficult to achieve the ideal state. Because the lubricity of water itself is poor, although lubricant and extreme pressure agent are added, under extreme working conditions, the oil film is easy to break, resulting in direct contact of the metal surface, generating large friction and wear. Not only will it cause scratches, pitting and other defects on the surface of the steel, affecting the appearance quality and surface finish of the product, but also will aggravate the wear of the roller, shorten the service life of the roller and increase the production cost. In terms of dispersibility, some components in the existing water-based rolling liquid have poor dispersion stability in water, which is easy to agglomerate and settle. This will cause uneven distribution of the components of the rolling liquid, and the performance of the rolling liquid in different parts will be different during use, affecting the consistency of the rolling effect. Moreover, the agglomerated particles may block the nozzle and other equipment components, affecting the normal injection and recycling of the rolling liquid.

[0004] In view of the above problems existing in the prior art, it is urgent to develop a high-lubricating and high-dispersing water-based steel cold rolling liquid and a preparation method thereof. The rolling liquid should have excellent lubricating performance, be able to meet the requirements of high-speed and large reduction cold rolling process, effectively reduce the surface defects of steel and the wear of the roller, and have good dispersing performance, so as to ensure that each component is uniformly and stably dispersed in water, and agglomeration and sedimentation are avoided. SUMMARY

[0005] In view of the defects of the above prior art, one object of the present application is to provide a high-lubricating and high-dispersing water-based steel cold rolling liquid and a preparation method thereof. The technical problems of poor lubricating performance and poor dispersing performance of the existing water-based steel cold rolling liquid are solved.

[0006] To achieve the above object, the technical scheme adopted by the present application is as follows: The first object of the present application is to provide a high-lubricating and high-dispersing water-based steel cold rolling liquid, which comprises the following components and their mass fractions: Base oil 40-95 parts Compound emulsifier 3-8 parts Extreme pressure agent 2-4 parts Antioxidant 0.5-1.5 parts Deionized water 20-50 parts The base oil comprises natural oil and synthetic ester; The natural oil is selected from one or more of palm oil, coconut oil, castor oil, beef tallow and lard; The synthetic ester is selected from one or more of pentaerythritol oleate, pentaerythritol stearate, trimethylolpropane oleate, trimethylolpropane laurate, isooctyl stearate and isooctyl palmitate; The mass ratio of the natural oil and the synthetic ester is (2-5):1; The compound emulsifier is composed of Span-60, sodium dodecyl sulfate and a cosolvent n-butanol; Preferably, the mass ratio of the Span-60, sodium dodecyl sulfate and the cosolvent n-butanol is (3-5):2:1; The extreme pressure agent is selected from one or more of sulfidized ester, alkyl polysulfide and phosphate ester; Preferably, the extreme pressure agent is oleyl polyoxyethylene ether phosphate ester; The antioxidant is selected from one or more of phenolic antioxidant, amine antioxidant and sulfur-phosphorus composite antioxidant; Preferably, the phenolic antioxidant is selected from one or both of T501 or Irganox L135; Preferably, the amine antioxidant is selected from Irganox L57 or Irganox L06; Preferably, the sulfur-phosphorus complex antioxidant is selected from T309 or ZDDP; The second object of the present application is to provide a preparation method of high-lubrication and high-dispersion water-based steel cold rolling liquid, comprising the following steps: S1, pre-complexing the extreme pressure agent and the emulsifier: ① Primary complexing: 50wt%-60wt% of the extreme pressure agent is mixed with Span-60 and n-butanol, and stirred at a temperature of 40-45℃ and a stirring speed of 1000-1200r / min for 15-20min to form a primary complexing system; ② Deep complexing: the remaining extreme pressure agent and sodium dodecyl sulfate are added to the primary complexing system, the temperature is raised to 50-55℃, the stirring speed is increased to 1300-1500r / min, and the stirring is continued for 20-25min to fully adsorb the extreme pressure agent molecules on the surface of the emulsifier micelles, forming a pre-complexing system; S2, oil phase preparation: the base oil is heated to 50-60℃, and the pre-complexing system of step S1 is added and stirred uniformly to form an oil phase; S3, water phase preparation: the pH value of the system is adjusted to 7.5-8.5 by adding a 1%-5% sodium hydroxide solution or potassium hydroxide solution dropwise in deionized water; S4, microemulsion and dynamic emulsification: the oil phase is slowly added to the water phase, and the oil phase is preliminarily dispersed by ultrasonic; high-pressure homogenization is used to obtain a high-lubrication and high-dispersion water-based steel cold rolling liquid.

[0007] Preferably, the power of the ultrasonic is 800-1000W, and the ultrasonic time is 20-30min; Preferably, the pressure of the high-pressure homogenization is 40-60MPa, and the number of cycles is 3-5.

[0008] The third object of the present application is to provide an application of the high-lubrication and high-dispersion water-based steel cold rolling liquid in improving the lubrication performance and dispersion performance of the rolling liquid.

[0009] Compared with the prior art, the present application has the following advantages: This invention creatively incorporates a composite emulsifier with specific components into water-based cold rolling fluid for steel, and employs a specific pre-composite process of the composite emulsifier and extreme pressure agent, as well as a microemulsion and dynamic emulsification process for the rolling fluid. On one hand, the extreme pressure agent is composited with Span-60 and sodium dodecyl sulfate in stages to form a mixed micelle structure of "hydrophobic chain entanglement + electrostatic adsorption". In the initial composite stage, the oleoyl alcohol chain of the extreme pressure agent combines with the hydrophobic chain of Span-60, and the polyoxyethylene ether chain interacts with n-butanol through hydrogen bonding, initially anchoring the active sites; in the deep composite stage, the phosphate ester groups interact with the sodium dodecyl sulfate... This structure fosters electrostatic synergy, enhancing the surface charge of the micelles. It inhibits particle agglomeration through the steric hindrance of the polyoxyethylene ether chains while ensuring uniform distribution of the extreme pressure agent, laying the foundation for subsequent lubricant film formation. Furthermore, the use of an "ultrasonic emulsification + high-pressure homogenization" process—emphasizing ultrasonic dispersion at 800-1000W and high-pressure refinement at 40-60MPa—ensures uniform distribution of oil phase particles. Alkalinity adjustment promotes hydroxylation of the metal surface, enhancing lubricant film adhesion. This results in a final rolling fluid with excellent lubrication performance (surface roughness Ra≤0.085μm) and good dispersion properties (maintaining no sedimentation or oil phase precipitation even after 30 days of standing). Detailed Implementation

[0010] Unless otherwise specified, the raw materials and equipment used in this invention are all commonly used in the field; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0011] Unless otherwise specified, the terms used in this specification have the same meaning as those commonly understood by those skilled in the art; however, in the event of any conflict, the definitions in this specification shall prevail.

[0012] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0013] The raw materials are selected as follows: Palm oil: Yihai Kerry, 24° refined palm oil; Pentaerythritol oleate: Haian Petrochemical Plant, Jiangsu Province, seaweed, PETO; Oleyl alcohol polyoxyethylene ether phosphate: Solvay, LUBRHOPHOS LB-400; Example 1 A highly lubricating and highly dispersible water-based steel cold rolling fluid comprises the following components and their mass fractions: 40 parts palm oil 20 parts of pentaerythritol oleate 6 parts of compound emulsifier Extreme pressure agent oleyl alcohol polyoxyethylene ether phosphate 2 parts Antioxidant Irganox L57 1 part Deionized water 50 parts; Among them, the composite emulsifier is composed of Span-60, sodium dodecyl sulfate and cosolvent n-butanol in a mass ratio of 3:2:1; The specific preparation method comprises the following steps: S1, extreme pressure agent oleyl polyoxyethylene ether phosphate and emulsifier pre-composite: ① Primary complex: 50wt% of the extreme pressure agent oleyl polyoxyethylene ether phosphate is mixed with Span-60 and n-butanol, stirred at a temperature of 40℃ and a stirring speed of 1000r / min for 20min to form a primary complex system; ② Deep complex: the remaining extreme pressure agent and sodium dodecyl sulfate are added to the primary complex system, the temperature is raised to 50℃, the stirring speed is increased to 1300r / min, and the stirring is continued for 25min to make the extreme pressure agent molecules fully adsorbed on the surface of the emulsifier micelles, forming a pre-composite system; S2, oil phase preparation: the palm oil and pentaerythritol oleate are mixed to form base oil, heated to 50℃, and the pre-composite system of step S1 is added and stirred uniformly to form an oil phase; S3, water phase preparation: 1% sodium hydroxide solution is added dropwise in deionized water to adjust the pH value of the system to 7.5; S4, microemulsion and dynamic emulsification: the oil phase is slowly added to the water phase, treated by ultrasonic treatment at 800W for 20min, and then subjected to high-pressure homogenization at a pressure of 40MPa for 3 cycles to obtain a high-lubrication and high-dispersion water-based steel cold rolling liquid.

[0014] Example 2 A high-lubrication and high-dispersion water-based steel cold rolling liquid, comprising the following components and mass fractions: Palm oil 50 parts Pentaerythritol oleate 10 parts Composite emulsifier 6 parts Extreme pressure agent oleyl polyoxyethylene ether phosphate 2 parts Antioxidant Irganox L57 1 part Deionized water 50 parts; Among them, the composite emulsifier is composed of Span-60, sodium dodecyl sulfate and cosolvent n-butanol in a mass ratio of 3:2:1; The specific preparation method comprises the following steps: S1, extreme pressure agent oleyl polyoxyethylene ether phosphate and emulsifier pre-composite: ① Primary complex: 50wt% of extreme pressure agent oil polyoxyethylene ether phosphate is mixed with Span-60 and n-butanol, and stirred at a temperature of 40℃ and a stirring speed of 1000 r / min for 20 min to form a primary complex system; ② Deep complex: the remaining extreme pressure agent and sodium dodecyl sulfate are added to the primary complex system, the temperature is raised to 50℃, the stirring speed is increased to 1300 r / min, and stirring is continued for 25 min to fully adsorb the extreme pressure agent molecules on the surface of the emulsifier micelles, forming a pre-complex system; S2, oil phase preparation: the palm oil and pentaerythritol oleate are mixed to form a base oil, heated to 50℃, and the pre-complex system of step S1 is added and stirred uniformly to form an oil phase; S3, water phase preparation: a 1% sodium hydroxide solution is added dropwise to deionized water to adjust the pH value of the system to 7.5; S4, microemulsion and dynamic emulsification: the oil phase is slowly added to the water phase, ultrasonically treated at 800W for 20 min, and then subjected to 3 cycles of high-pressure homogenization at a pressure of 40MPa to obtain a high-lubricity and high-dispersibility water-based steel cold rolling liquid.

[0015] Example 3 The mass ratio of Span-60, sodium dodecyl sulfate and cosolvent n-butanol in the complex emulsifier in Example 1 is modified to 5:2:1, and the rest is consistent with Example 1, to obtain a high-lubricity and high-dispersibility water-based steel cold rolling liquid of Example 3.

[0016] Example 4 The amount of extreme pressure agent oil polyoxyethylene ether phosphate added in the primary complex in Example 1 is adjusted to 60wt%, and the rest is consistent with Example 1, to obtain a high-lubricity and high-dispersibility water-based steel cold rolling liquid of Example 4.

[0017] Comparative Example 1 The mass ratio of Span-60, sodium dodecyl sulfate and cosolvent n-butanol in the complex emulsifier in Example 1 is modified to 2:2:1, and the rest is consistent with Example 1, to obtain a water-based steel cold rolling liquid of Comparative Example 1.

[0018] Comparative Example 2 The mass ratio of Span-60, sodium dodecyl sulfate and cosolvent n-butanol in the complex emulsifier in Example 1 is modified to 6:2:1, and the rest is consistent with Example 1, to obtain a water-based steel cold rolling liquid of Comparative Example 2.

[0019] Comparative Example 3 The primary complex EP agent oleyl polyoxyethylene ether phosphate in Example 1 was adjusted to 40wt%, and the other conditions were the same as those in Example 1 to obtain the water-based steel cold rolling liquid of Comparative Example 3.

[0020] Comparative Example 4 The primary complex EP agent oleyl polyoxyethylene ether phosphate in Example 1 was adjusted to 70wt%, and the other conditions were the same as those in Example 1 to obtain the water-based steel cold rolling liquid of Comparative Example 4.

[0021] Comparative Example 5 The step S1 in the specific preparation method in Example 1 was modified as: "S1, the EP agent oleyl polyoxyethylene ether phosphate, Span-60, sodium dodecyl sulfate and n-butanol were mixed at one time, and stirred at a temperature of 50℃ and a stirring speed of 1300r / min for 40min to form a pre-complex system". The other conditions were the same as those in Example 1.

[0022] Comparative Example 6 The step S4 in the specific preparation method in Example 1 was modified as: "S4, microemulsion preparation: the oil phase was slowly added into the water phase, and ultrasonic treatment was carried out for 30min under the condition of ultrasonic power of 800W to obtain the water-based steel cold rolling liquid". The other conditions were the same as those in Example 1.

[0023] Performance test: 1. Dispersion performance characterization 30-day standing stability test: Test steps: (1) 50mL of the rolling liquid sample was taken and filled into a graduated cylinder with a stopper, and the initial liquid level was marked; (2) The graduated cylinder was placed in a 25℃ constant temperature box for 30 days without shaking; (3) Whether the sample was stratified, agglomerated or precipitated was observed, and the volume ratio of the upper oil phase was recorded.

[0024] 2. Lubrication performance characterization Surface roughness Ra value test: The stainless steel was rolled by a reversible rolling mill of I2S company, USA, at a reduction rate of 30% and a rolling speed of 800m / min, and after continuous rolling for 50 times, the surface roughness of the obtained stainless steel was tested by a stylus profilometer.

[0025] The test results are shown in Table 1. Table 1

[0026] As can be seen from the comparison of examples 1-4 and comparative examples 1-6 in Table 1, the present application adds a composite emulsifier with specific components into a water-based steel cold rolling liquid, and through specific pre-complexing process of the composite emulsifier and the extreme pressure agent and micro-emulsion and dynamic emulsification process of the rolling liquid, the final obtained rolling liquid has better lubricating performance (surface roughness Ra≤0.085 μm) and good dispersion performance (can keep the rolling liquid from precipitating and oil phase from separating out for 30 days).

[0027] As can be seen from the comparison of examples 1-4 and comparative examples 1-6 in Table 1, when the adding amount of span-60 in the composite emulsifier of the rolling liquid or the initial adding amount of the extreme pressure agent is different from the content defined in the present application, or the two-step pre-complexing process is not used and the high-pressure homogenization process is not used, it will have certain negative effects on the performance of the final rolling liquid.

[0028] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them. Although the embodiments of the present application have been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the present application can still be modified or replaced by equivalents, and these modifications or replacements should not make the modified technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high lubrication high dispersibility water-based steel material cold rolling liquid, characterized by, It comprises the following components and their mass parts: Base oil 40-95 parts; Compound emulsifier 3-8 parts; Extreme pressure agent 2-4 parts; Antioxidant 0.5-1.5 parts; Deionized water 20-50 parts; The compound emulsifier is composed of Span-60, sodium dodecyl sulfate and cosolvent n-butanol; The mass ratio of Span-60, sodium dodecyl sulfate and cosolvent n-butanol is (3-5):2:

1.

2. The high-lubrication and high-dispersion water-based steel cold rolling liquid according to claim 1, wherein the base oil comprises natural oil and synthetic ester; the extreme pressure agent is selected from one or more of sulfurized ester, alkyl polysulfide and phosphate ester; and the antioxidant is selected from one or more of phenolic antioxidant, amine antioxidant and sulfur-phosphorus composite antioxidant. The natural oil is selected from one or more of palm oil, coconut oil, castor oil, beef tallow and lard; 3. The high lubricity high dispersancy water based steel cold rolling fluid of claim 2, wherein, The synthetic ester is selected from one or more of pentaerythritol oleate, pentaerythritol stearate, trimethylolpropane oleate, trimethylolpropane laurate, isooctyl stearate and isooctyl palmitate; The mass ratio of the natural oil and synthetic ester is (2-5):1; The extreme pressure agent is oleyl polyoxyethylene ether phosphate ester; The phenolic antioxidant is selected from one or both of T501 and Irganox L135; the amine antioxidant is selected from Irganox L57 or Irganox L06; and the sulfur-phosphorus composite antioxidant is selected from T309 or ZDDP. It comprises the following steps:

4. A process for the preparation of a high lubricity high dispersancy water based steel cold rolling fluid according to any one of claims 1 to 3, characterized in that, S1, pre-complexing the extreme pressure agent with the emulsifier: ① Primary complexing: mixing 50wt%-60wt% of the extreme pressure agent with Span-60 and n-butanol, stirring at a temperature of 40-45℃ and a stirring speed of 1000-1200r / min for 15-20min to form a primary complexing system; ② Deep complexing: adding the remaining extreme pressure agent and sodium dodecyl sulfate to the primary complexing system, increasing the temperature to 50-55℃, increasing the stirring speed to 1300-1500r / min, and continuing to stir for 20-25min to make the extreme pressure agent molecules fully adsorb on the surface of the emulsifier micelles, forming a pre-complexing system; S2, oil phase preparation: heating the base oil to 50-60℃, adding the pre-complexing system of step S1, and stirring uniformly to form an oil phase; S3, water phase preparation: adjusting the pH value of the system to 7.5-8.5 by adding a 1%-5% sodium hydroxide solution or potassium hydroxide solution dropwise in deionized water; S4, microemulsion and dynamic emulsification: using a two-step preparation process of "ultrasonic emulsification + high-pressure homogenization", first slowly adding the oil phase into the water phase, and then making the oil phase preliminarily dispersed through ultrasonic; and then obtaining the high-lubrication and high-dispersion water-based steel cold rolling liquid through high-pressure homogenization. The power of the ultrasonic in step S4 is 800-1000W, and the ultrasonic time is 20-30min; the pressure of the high-pressure homogenization is 40-60MPa, and the number of cycles is 3-5.

5. The method for preparing the high-lubricity, high-dispersibility water-based steel cold rolling fluid according to claim 4, characterized in that, ​ 6. The use of the high lubricating and high dispersing water-based steel cold rolling liquid as claimed in any one of claims 1 to 3 or the high lubricating and high dispersing water-based steel cold rolling liquid prepared by the method as claimed in any one of claims 4 to 5 for improving the lubricating and dispersing properties of the rolling liquid.

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