High-extreme-pressure anti-wear emulsion type expanding oil and preparation method thereof

Abstract

The invention belongs to the technical field of metal processing lubrication, and provides high-extreme-pressure anti-wear emulsion type expanding oil and a preparation method of the high-extreme-pressure anti-wear emulsion type expanding oil. Comprising the following steps: compounding naphthenic base oil, polyalkyl benzyl sulfide, vulcanized vegetable oil, sodium dodecyl benzene sulfonate, octylphenol polyoxyethylene ether, benzotriazole and methyldiethanolamine according to specific parts by mass to construct a carrier-extreme pressure-emulsification-corrosion prevention integrated system; wherein the naphthenic base oil (the kinematic viscosity at 40 DEG C is 350-400 mm / s) provides a stable carrier, the polyalkyl benzyl sulfide (the sulfur content is 20-30%) is a chloride-free extreme pressure core, the composite emulsifier ensures the stability of the system, and efficient protection is realized through double-component corrosion prevention; according to the invention, the 3% emulsion can be stably placed for more than or equal to 2 weeks, the maximum non-seizure load is more than 1800N, the emulsion is suitable for expanding large-diameter steel pipes made of Q235A, X70 / X80 and the like and cold forming processing of metal, the problems of insufficient extreme pressure, unstable emulsification, poor environmental protection property and the like of the existing product are solved, and the processing quality and efficiency are improved.

Description

Technical Field

[0001] This invention belongs to the field of metalworking lubrication technology, and particularly relates to a high extreme pressure anti-wear emulsified expanding oil and its preparation method. Background Technology

[0002] The current large-diameter steel pipe expansion process is a high-pressure, high-load cold forming process, and various types of expansion oil technologies have been developed accordingly. Regarding base oils, the main selections include plant-based (such as CN109504517A, which uses oligomeric vegetable oil with a kinematic viscosity of 430-800 mm² / s at 40℃), paraffinic mineral-based (such as CN104450024A and CN201410591456.X, which use 250SN base oil), and plant-based + mineral-based mixed bases (such as KR20080020442A). Extreme pressure anti-wear systems mainly include chlorinated systems (such as CN103789071B, which uses chlorinated paraffin + sulfurized isobutylene) and sulfur-phosphorus systems (such as CN102...). The technical solutions include 031186A's sulfurized olefin + phosphorus-based agent and T321's sulfurized isobutylene system (such as CN104450024A and CN201410591456.X); emulsification systems include castor oil polyoxyethylene ether + fatty alcohol polyoxyethylene ether (CN109504517A), AE-3 + TX-10 + NP-6 (CN103789071B), and composite surfactant-assisted emulsification (CN102031186A); for corrosion protection, there are different designs such as single inhibitors and rare earth corrosion inhibitors + sodium benzoate. These technical solutions all attempt to optimize the extreme pressure lubrication and emulsification performance of the diameter-expanding oil, but many unresolved defects still exist.

[0003] The existing enlargement oil technology has the following core problems: The base oils exhibit poor compatibility and unbalanced performance. Plant-based base oils have weak antioxidant properties and short service life (e.g., product CN109504517A has a service life of only 3 months), while paraffinic base oils have poor emulsification properties and are prone to separation (e.g., the 3% emulsion of CN201410591456.X separates after only 1 week). Mixed base oils still cannot balance emulsification and stability. Extreme pressure wear resistance and environmental friendliness are difficult to balance. Chlorine-containing extreme pressure systems (such as CN103789071B) have poor environmental performance and are difficult to treat wastewater. Conventional sulfur-phosphorus systems and T321 isobutylene sulfide systems (such as CN104450024A and CN201410591456.X) have insufficient extreme pressure performance, with a maximum non-seize load ≤1500N, which cannot meet the diameter expansion requirements of high-strength steel pipes such as X70 / X80. The emulsions exhibit weak stability and low cleaning efficiency. Existing emulsion systems typically have a stable emulsion storage time of ≤1.5 weeks (e.g., CN109504517A is stable for 1 week, CN103789071B for 1.5 weeks), long foam elimination time (45-60 seconds), and low subsequent cleaning efficiency, making them unsuitable for continuous production line recycling requirements. Limited corrosion protection and cost imbalance; single corrosion inhibitors are insufficient; solutions with rare earth corrosion inhibitors (such as CN201410591456.X) are costly and have poor synergy with extreme pressure agents; and most products do not achieve synergy between corrosion protection and oil-water separation and recycling. The preparation process is complex and energy-intensive. Some schemes use a "one-step mixing and stirring" method, which leads to uneven dispersion of components (such as CN109504517A). Some schemes use high-temperature emulsification at 80-90℃ (such as CN103789071B) or multi-step heating process (such as room temperature - 70℃ - 90℃ in CN201410591456.X), which is energy-intensive, cumbersome and has poor repeatability. Therefore, a high extreme pressure anti-wear emulsified expanding oil and its preparation method are needed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a high extreme pressure anti-wear emulsified expanding oil and its preparation method, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high extreme pressure anti-wear emulsified diameter-expanding oil, which is compounded from a carrier base oil, an extreme pressure anti-wear component, an oily component, a composite emulsifying component, and an anti-corrosion component in specific mass proportions. The carrier base oil is a naphthenic base oil with a kinematic viscosity of 350-400 mm² / s at 40°C. The extreme pressure anti-wear component contains a polyalkylbenzyl sulfide with a sulfur content of 20-30%. The oily component is a sulfurized vegetable oil with a flash point >200°C. The composite emulsifying component is composed of sodium dodecylbenzenesulfonate and octylphenol polyoxyethylene ether with a carboxyl group of 44-54 mg KH / g. The anti-corrosion component is a compound of benzotriazole and methyl diethanolamine. The mass fraction range of each component is as follows: naphthenic base oil 40.0-60.0 parts, polyalkyl benzyl sulfide 2.0-6.0 parts, sulfurized vegetable oil 15.0-25.0 parts, sodium dodecylbenzene sulfonate 3.0-7.0 parts, octylphenol polyoxyethylene ether 8.0-12.0 parts, benzotriazole 0.2-1.0 parts, methyl diethanolamine 0.3-1.2 parts; The synergistic effect of the components gives the expanding oil chlorine-free environmental protection properties as well as excellent extreme pressure anti-wear, emulsification stability and anti-corrosion performance. An integrated synergistic system of "carrier-extreme pressure-emulsification-corrosion protection" was constructed. Naphthenic base oil, acting as the carrier, combines the stability of paraffinic oils with the emulsifying properties of vegetable oils at 40℃, providing a uniform dispersion environment for other functional components. Polyalkylbenzyl sulfide, serving as the core of the chlorine-free extreme pressure system, ensures load-bearing capacity under high-pressure conditions with its high sulfur content of 20-30%. Sulfated vegetable oil, with its high flash point, enhances lubrication performance and synergistically strengthens anti-wear effects with the extreme pressure components. Sodium dodecylbenzenesulfonate and octylphenol polyoxyethylene ether are compounded in a specific ratio, reducing oil-water interfacial tension through complementary molecular structures, ensuring long-term stability of the emulsion system. Benzotriazole and methyl diethanolamine are compounded to form a synergistic corrosion protection system, avoiding the performance limitations of a single corrosion protection component. By compounding each component in specified mass proportions, the core performance of extreme pressure anti-wear, emulsion stability, and corrosion protection and environmental protection are synergistically optimized, ultimately achieving a comprehensive effect of chlorine-free environmental protection, excellent extreme pressure performance, and reliable emulsion stability.

[0006] A further technical solution is provided, wherein the naphthenic base oil meets the following performance indicators: kinematic viscosity at 40℃ 350-400 mm² / s, open flash point ≥200℃, 260nm UV absorption ≤0.35, evaporation loss at 107℃ / 22h ≤0.5%, and carbon form analysis CA ≤2.0% and CN ≥35%; The key performance indicators of the naphthenic base oil are defined, directly ensuring the core function of the carrier base oil. A kinematic viscosity range of 350-400 mm² / s at 40℃ ensures the base oil possesses both fluidity and load-carrying capacity, adapting to a wide processing temperature range of -10℃ to 40℃; an open-cup flash point ≥200℃ ensures safety during processing, avoiding safety hazards under high-temperature conditions; 260nm UV absorption ≤0.35 and carbon form analysis CA ≤2.0% and CN ≥35% ensure the chemical stability of the base oil and reduce the rate of oxidation and aging; evaporation loss ≤0.5% at 107℃ / 22h reduces losses during use, extends product lifespan, and prevents overall system failure due to fluctuations in base oil performance.

[0007] A further technical solution is that the polyalkylbenzyl sulfide is generated by reacting benzyl halide with sodium sulfide under specific conditions, and has the following molecular formula: (C6H5CH2)n(S)n (n is the degree of polymerization, R is a 1-6 carbon alkyl group), and satisfies: sulfur content 20-30%, kinematic viscosity at 40℃ ≥150mm² / s; The synthesis route, molecular structure, and key performance indicators of polyalkylbenzyl sulfides were clarified, ensuring the core function of extreme pressure anti-wear. A specific structure (molecular formula (C6H5CH2)n(S)n) generated by the reaction of benzyl halides with sodium sulfide ensures the structural stability and activity of the extreme pressure agent; a sulfur content of 20-30% allows for rapid reaction with metal surfaces under high pressure conditions, forming a high-strength, high-wear-resistant sulfide film to resist direct contact and seizing between metals; a kinematic viscosity ≥150mm² / s at 40℃ ensures the dispersion stability of the extreme pressure agent in base oil, preventing sedimentation or stratification, while also ensuring the uniformity of extreme pressure performance, achieving a breakthrough in extreme pressure performance under the premise of chlorine-free environmental protection.

[0008] A further technical solution is that the closed-cup flash point of the sulfurized vegetable oil is ≥200℃, and the moisture content (m / m) is ≤0.2%; The key performance indicators of the sulfurized vegetable oil are defined to ensure the lubrication and auxiliary functions of the oily components. A closed-cup flash point ≥200℃, synergistically with the high flash point characteristic of the base oil in claim 2, further enhances the safety of the processing and avoids fire hazards in high-temperature processing scenarios. A water content (m / m) ≤0.2% effectively prevents water from damaging the stability of the emulsion system, preventing oil and soap separation due to excessive water content, while also ensuring the compatibility of the sulfurized vegetable oil with other components and assisting the extreme pressure components in improving the overall lubrication and anti-wear effect.

[0009] A further technical solution is provided that the octylphenol polyoxyethylene ether satisfies the following requirements: carboxyl value 44-54 mgKH / g, moisture content (m / m) ≤ 2.0%, and acid value ≤ 2.0 mgKH / g; Key performance indicators of octylphenol polyoxyethylene ether are defined to ensure the stable function of the composite emulsion system. A carboxyl value of 44-54 mgKH / g ensures the surface activity of the emulsifier, enabling it to effectively reduce the interfacial tension between oil and water and promote the uniform dispersion of the oil phase component in the aqueous phase. A water content (m / m) ≤2.0% and an acid value ≤2.0 mgKH / g prevent the emulsifier from deteriorating due to moisture or acidic substances, ensuring the long-term stability of the emulsifier, preventing stratification of the emulsion system due to emulsifier failure, and ensuring the long-term stable storage capability of the 3% emulsion.

[0010] A further technical solution is that the 3% emulsion of the expansion oil can be stably stored for ≥2 weeks, the foam can be eliminated within 30 seconds, the maximum non-seizing load is >1800N, the sintering load is >4500N, and the copper sheet corrosion level is ≤1b. The core performance effects of the diameter-expanding oil are clearly defined, directly reflecting the synergistic effect of each component. The indicators of stable standing of the 3% emulsion for ≥2 weeks and foam elimination within 30 seconds solve the pain points of unstable emulsion and excessive foaming in existing products, ensuring the product's recyclability in continuous production lines. Extreme pressure performance with a maximum non-seize load >1800N and sintering load >4500N breaks through the performance limits of existing extreme pressure systems, stably adapting to the high-pressure diameter-expanding requirements of high-strength steel pipes such as X70 / X80. The anti-corrosion effect with a copper strip corrosion level ≤1b ensures that processed parts and equipment are not corroded, extending the surface quality of processed parts and the service life of equipment, comprehensively covering the usage requirements under extreme working conditions.

[0011] Further technical solutions are applicable to the expansion processing of large-diameter straight seam steel pipes made of Q235A, 16Mn, and X70 / X80 materials, and are also suitable for heavy cold forming processing scenarios such as metal drawing and bending. The limitation on the product's application scenarios is an extension of the synergistic advantages of its components. Based on the wide temperature adaptability (-10℃-40℃) of naphthenic base oil, the strong load-bearing capacity of the extreme pressure system (sintering load > 4500N), and the broad-spectrum protection of the anti-corrosion system (copper strip corrosion level ≤ 1b), the product can achieve full coverage adaptation to large-diameter steel pipes of various materials such as Q235A, 16Mn, and X70 / X80. At the same time, it is compatible with heavy cold forming processing scenarios such as metal drawing and bending. This breaks through the limitations of existing products that are only suitable for a single material or a single processing scenario, and significantly broadens the product's application scope and market competitiveness.

[0012] A method for preparing a high extreme pressure anti-wear emulsified expanding oil, applicable to any of the high extreme pressure anti-wear emulsified expanding oils described above, includes the following steps: S1. Under normal temperature conditions, add the naphthenic base oil to the stirring equipment, add benzotriazole and methyldiethanolamine, and stir at 300-500 r / min for 30-40 min until completely dissolved; S2. Raise the system temperature to 55-65℃, add polyalkylbenzyl sulfide and sulfurized vegetable oil, and adjust the speed to 600-800r / min and stir for 1-1.5h; S3. Maintain a temperature of 55-65℃, add sodium dodecylbenzenesulfonate and octylphenol polyoxyethylene ether, stir for 1-1.5h and then keep warm for 2-3h. S4. Cool to room temperature and filter through a 200-mesh filter to obtain the finished product; The process route and key parameters for product preparation are clearly defined, ensuring product performance stability. The room-temperature dissolution step (300-500 rpm, 30-40 min) ensures uniform dispersion of the anti-corrosion component in the base oil, with no visible particles, providing a uniform carrier environment for subsequent extreme pressure and emulsifying component compounding. The medium-temperature compounding step (55-65℃, 600-800 rpm, 1-1.5 h) promotes full integration of the extreme pressure component and the oily component through precise temperature and speed control, avoiding performance fluctuations caused by excessively high local concentrations. The medium-temperature molding and holding step (55-65℃, 1-1.5 h stirring + 2-3 h holding) promotes interfacial integration of the emulsifier with other systems, enhancing emulsification stability. The room-temperature filtration step (200-mesh filter) removes trace impurities from the system, ensuring product purity and safety. The entire process route is energy-efficient, simple, and highly repeatable, significantly reducing production costs compared to existing complex processes and facilitating industrial mass production.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention significantly improves base oil compatibility and solves the problem of performance imbalance: it selects naphthenic base oils with a kinematic viscosity of 350-400 mm² / s at 40℃, which combines the stability of paraffinic oils with the emulsifying properties of vegetable oils, avoiding the pain points of easy aging of vegetable oils and poor emulsification of mineral oils; the product is suitable for a wide temperature processing environment of -10℃ to 40℃, and has stronger compatibility with steel pipes of various materials from Q235A to X80, expanding the compatibility range by more than 50% compared with existing base oil solutions; This invention achieves synergistic optimization of extreme pressure anti-wear and environmental friendliness, solving both performance deficiencies and environmental challenges: The chlorine-free extreme pressure system, consisting of "polyalkylbenzyl sulfide + sulfurized vegetable oil," utilizes the high sulfur content (20-30%) of the polyalkylbenzyl sulfide to form a high-strength sulfurized film under high pressure conditions, while the sulfurized vegetable oil assists in forming a lubricating film. This dual protection results in a maximum non-seizure load >1800N and a sintering load >4500N, representing an improvement of over 30% in extreme pressure performance compared to the T321 system in CN104450024A. Furthermore, the chlorine-free formula avoids the wastewater treatment problems associated with chlorine-containing products, reducing wastewater treatment costs by 50%, aligning with environmental trends. This invention significantly enhances emulsification stability and solves the problems of stratification and foaming: the "sodium dodecylbenzenesulfonate + octylphenol polyoxyethylene ether" composite emulsification system allows the 3% emulsion to be stably stored for ≥2 weeks, which is twice the 1-week stability of CN109504517A; the foam elimination time is ≤30 seconds, which is 30%-50% shorter than existing products, and the efficiency of subsequent high-pressure cleaning is improved by 40%, fully meeting the recycling requirements of continuous production lines; This invention achieves a balance between anti-corrosion effect and cost, solving the problems of insufficient protection and cost imbalance: the anti-corrosion system composed of benzotriazole and methyldiethanolamine makes the corrosion level of copper sheet ≤1b, and the protection effect is better than that of a single anti-corrosion inhibitor; at the same time, it realizes oil-water separation and recycling, and reduces the cost by 35% compared with the rare earth addition scheme of CN201410591456.X, taking into account both anti-corrosion effect and economy. This invention improves process economy and solves the problem of complex and high consumption: the two-step process of "room temperature dissolution + medium temperature compounding" reduces energy consumption by 25% compared with the high temperature emulsification process of CN103789071B and simplifies the process by 30% compared with the multi-step heating process of CN201410591456.X; the overall production cost is reduced by 15-20%, the repeatability is strong, it is easy to carry out industrial mass production, and the production efficiency is increased by more than 40%.

[0014] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall process of the present invention; Figure 2 This is a component content diagram of the high extreme pressure anti-wear emulsified expansion oil of the present invention; Figure 3 This is a graph showing the analytical data of the high extreme pressure anti-wear emulsified expanding oil of this invention; Figure 4 This is a comparison chart of the present invention and existing patents. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments.

[0017] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0018] Example 1

[0019] like Figure 1-4 As shown, this embodiment of the invention provides a high extreme pressure anti-wear emulsified expanding oil, comprising the following components by mass parts: 58.55 parts of naphthenic base oil (kinematic viscosity 380 mm² / s at 40°C), 4.0 parts of polyalkylbenzyl sulfide (sulfur content 25%), 21.53 parts of sulfurized vegetable oil (flash point 220°C), 5.37 parts of sodium dodecylbenzene sulfonate, 9.56 parts of octylphenol polyoxyethylene ether (carboxyl group 48 mg KOH / g), 0.48 parts of benzotriazole, and 0.51 parts of methyl diethanolamine.

[0020] The performance indicators of the naphthenic base oil are as follows: open-cup flash point 215℃, 260nm UV absorption 0.28, evaporation loss at 107℃ / 22h 0.32%, carbon form analysis CA 1.8% and CN 38%, exhibiting both good stability and emulsification properties; the polyalkylbenzyl sulfide is generated by the reaction of benzyl halide and sodium sulfide, with the molecular formula (C6H5CH2)n(S)n (R is a 4-carbon alkyl group), kinematic viscosity at 40℃ 180mm² / s, and sulfur content within the specified range of 20-30%; the water content (m / m) of the sulfurized vegetable oil is 0.15%, and the closed-cup flash point is 220℃; the water content (m / m) of the octylphenol polyoxyethylene ether is 1.2%, the acid value is 1.5mgKOH / g, and the carboxyl value is in the range of 44-54mgKOH / g.

[0021] Its preparation method specifically includes the following steps: At room temperature, 58.55 kg of the above naphthenic base oil was added to a stirred tank, followed by 0.48 kg of benzotriazole and 0.51 kg of methyl diethanolamine. The stirring speed was adjusted to 300 r / min and stirred continuously for 35 min until all components were completely dissolved and no visible particles were found in the system. Raise the temperature of the stirred tank to 60℃, add 4.0 kg of polyalkylbenzyl sulfide extreme pressure anti-wear agent and 21.53 kg of sulfurized vegetable oil oiliness agent, increase the stirring speed to 700 r / min, and continue stirring for 1.2 h to fully integrate the extreme pressure component and the oily component. Keep the temperature of the stirred tank constant at 60℃, add 5.37 kg sodium dodecylbenzenesulfonate and 9.56 kg octylphenol polyoxyethylene ether, and continue stirring at 700 r / min for 1.3 h, then keep warm for 2.5 h to promote the interfacial integration of the composite emulsifier with the extreme pressure lubrication system and the anti-corrosion pretreatment system; After naturally cooling to room temperature, the system is filtered through a 200-mesh filter to remove trace impurities and incompletely dissolved particles, resulting in a brown, viscous liquid high-pressure anti-wear emulsified expansion oil product.

[0022] In this embodiment, performance tests were conducted on the finished product (testing standards refer to GB / T30582-2014 and related national standard methods). The results are as follows: the kinematic viscosity of the finished product (40℃) is 432 mm² / s, the copper strip corrosion (100℃, 3h) grade is 1b; the maximum non-seize load is 1892N, and the sintering load is 4900N; the 3% emulsion showed no oil or soap separation after 30 days of storage, the foam elimination time was only 25 seconds, and the pH value of the 3% emulsion was 8.4. This finished product is successfully adapted to the diameter expansion processing of large-diameter straight seam steel pipes made of Q235A, 16Mn, and X70 / X80 materials. It can also be used in heavy-duty cold forming processing scenarios such as metal drawing and bending. During processing, the lubrication effect is excellent, the wear of the diameter expansion head is significantly reduced, the surface quality of the processed parts is good, and the overall performance is balanced and stable.

[0023] Example 2 The difference between this embodiment and Example 1 lies in the adjustment of the mass ratio of the components, some raw material performance parameters, and preparation process parameters. Specifically, it includes the following components by mass: 40.0 parts of naphthenic base oil (kinematic viscosity 350 mm² / s at 40℃), 6.0 parts of polyalkylbenzyl sulfide (sulfur content 30%), 15.0 parts of sulfurized vegetable oil (flash point 210℃), 7.0 parts of sodium dodecylbenzene sulfonate, 12.0 parts of octylphenol polyoxyethylene ether (carboxyl group 54 mg KOH / g), 1.0 part of benzotriazole, and 1.2 parts of methyldiethanolamine.

[0024] The performance indicators of the naphthenic base oil are as follows: open flash point 205℃, 260nm UV absorption 0.32, evaporation loss at 107℃ / 22h 0.45%, carbon form analysis CA 1.9% and CN 36%; the polyalkylbenzyl sulfide is generated by the reaction of benzyl halide and sodium sulfide, and its molecular formula is (C6H5CH2). n (S) n (R is a 6-carbon alkyl group), kinematic viscosity at 40℃ is 200 mm² / s, sulfur content reaches 30%; the water content (m / m) of the sulfurized vegetable oil is 0.18%, and the closed-cup flash point is 210℃; the water content (m / m) of the octylphenol polyoxyethylene ether is 1.8%, the acid value is 1.8 mgKOH / g, and the carboxyl value meets the requirement of 44-54 mgKOH / g.

[0025] The specific steps of its preparation method are as follows: At room temperature, 40.0 kg of the above naphthenic base oil was added to a stirred tank, followed by 1.0 kg of benzotriazole and 1.2 kg of methyl diethanolamine. The stirring speed was adjusted to 500 r / min and stirred for 30 min until all components were completely dissolved and no visible particles were found in the system. Raise the temperature of the mixing vessel to 55℃, add 6.0 kg of polyalkylbenzyl sulfide extreme pressure anti-wear agent and 15.0 kg of sulfurized vegetable oil oiliness agent, increase the stirring speed to 800 r / min, and continue stirring for 1.0 h to fully integrate the extreme pressure component and the oily component. Keep the temperature of the stirred tank constant at 55℃, add 7.0 kg sodium dodecylbenzenesulfonate and 12.0 kg octylphenol polyoxyethylene ether, and continue stirring at 800 r / min for 1.0 h, then keep warm for 3.0 h to promote the interfacial fusion of the composite emulsifier with the extreme pressure lubrication system and the anti-corrosion pretreatment system; After naturally cooling to room temperature, it is filtered through a 200-mesh filter to remove trace impurities and incompletely dissolved particles, resulting in a brown, viscous liquid product.

[0026] In this embodiment, the finished product was tested according to the same testing standards, and the results are as follows: the kinematic viscosity (40℃) of the finished product is 428 mm² / s, and the copper sheet corrosion (100℃, 3h) grade is 1b; due to the polyalkylbenzyl sulfide content reaching the upper limit of 2.0-6.0 parts and the sulfur content of 30%, the extreme pressure performance is more outstanding, with the maximum non-seize load reaching 1980N and the sintering load reaching 5200N; the 3% emulsion was stable for 28 days without any abnormalities, the foam elimination time was 20 seconds, and the pH value of the 3% emulsion was 8.8. This finished product performed excellently in the scenarios of expanding the diameter of X70 / X80 ultra-high strength steel pipes and high-load metal drawing processing. The life of the expanding head was further extended by 10% compared with Example 1, the surface roughness of the processed parts was significantly reduced, and the preparation process parameters were within the predetermined extreme values, yet qualified products could still be stably produced, fully verifying the reliability, flexibility, and industrial application potential of the technical solution of this invention.

[0027] Working principle and usage process of this invention: Working principle of the preparation process: Step 1: Room Temperature Dissolution. After adding the naphthenic base oil to a stirring device, benzotriazole and methyldiethanolamine are added sequentially, and the mixture is stirred at 300-500 rpm for 30-40 minutes. The cyclic structure and polar groups in the naphthenic base oil molecule provide stable dissolution sites for the anti-corrosion components. The nitrogen heterocycle of benzotriazole and the amino group of methyldiethanolamine are synergistically adsorbed onto the surface of the base oil molecules through intermolecular forces, forming a uniformly dispersed anti-corrosion pretreatment system. This provides a uniform carrier environment for the subsequent compounding of extreme pressure and emulsifying components.

[0028] The second step involves preparing a medium-temperature compound extreme pressure lubrication system: The system temperature is raised to 55-65℃, and polyalkylbenzyl sulfide and sulfurized vegetable oil are added. The stirring speed is increased to 600-800 r / min and stirred for 1-1.5 hours. The medium-temperature environment significantly enhances the molecular kinematic activity of the extreme pressure agent and the oiliness agent. The sulfur atoms in the polyalkylbenzyl sulfide and the ester groups in the sulfurized vegetable oil work synergistically to form a stable extreme pressure lubrication system with the base oil molecules. High-speed stirring ensures uniform dispersion of the extreme pressure component and the oiliness component, avoiding performance fluctuations caused by excessively high local concentrations.

[0029] The third step involves a medium-temperature emulsification system: maintaining a temperature of 55-65℃, adding the composite emulsifier, and continuing to stir for 1-1.5 hours, followed by heat preservation for 2-3 hours. The hydrophilic and hydrophobic groups in the emulsifier molecules combine with the aqueous and oil phases respectively, reducing the interfacial tension between oil and water through directional alignment. The medium-temperature heat preservation process further promotes the formation of a dense emulsion film on the oil phase surface by the emulsifier molecules, ensuring that the emulsion does not separate into oil or soap during long-term storage and recycling.

[0030] Step 4: Room temperature filtration. After cooling to room temperature, the product is filtered through a 200-mesh filter to remove any trace mechanical impurities and undissolved microparticles that may be present in the system, ensuring the uniformity of the finished product and its safety in use.

[0031] How it works during use: Emulsification process: The finished expansion oil is mixed with water at a ratio of 3%. Under stirring, the composite emulsifier is rapidly dispersed and oriented at the oil-water interface to form a stable oil-in-water emulsion. The emulsion film prevents oil droplet aggregation through steric hindrance, ensuring the stability of the emulsion during recycling.

[0032] Lubrication and extreme pressure protection: When the emulsion acts on the metal processing interface, the oil phase components (naphthenic base oil, polyalkylbenzyl sulfide, sulfurized vegetable oil) quickly form a physical lubricating film on the metal surface through adsorption. Under high pressure load, the polyalkylbenzyl sulfide reacts chemically with the metal surface to generate a high-strength, high-wear-resistant sulfurized film, which resists direct contact and seizing between metals. The sulfurized vegetable oil further reduces the coefficient of friction through molecular lubrication, synergistically improving the extreme pressure carrying capacity.

[0033] Corrosion protection: Benzotriazole and methyldiethanolamine form a dense composite anti-corrosion film on the metal surface through chemical adsorption, which isolates the metal surface from corrosive media such as air and moisture, effectively inhibits metal oxidation and rust, ensures that the corrosion level of copper sheets is controlled at ≤1b, and protects the surface quality of processed parts and the service life of processing equipment.

[0034] Circulation and Cleaning: The excellent stability of the emulsion allows it to be recycled in continuous production lines. After use, the oil phase can be recovered and reused by simple oil-water separation. The low foaming properties and good water solubility of the composite emulsifier ensure that residual oil film on the metal surface can be quickly removed during subsequent high-pressure cleaning, improving cleaning efficiency and reducing cleaning costs.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high extreme pressure anti-wear emulsified diameter-expanding oil, characterized in that, It is formulated by compounding carrier base oil, extreme pressure anti-wear component, oily component, composite emulsifying component and anti-corrosion component in a specific mass ratio. The carrier base oil is a naphthenic base oil with a kinematic viscosity of 350-400 mm² / s at 40℃. The extreme pressure anti-wear component contains polyalkylbenzyl sulfide with a sulfur content of 20-30%. The oily component is a sulfurized vegetable oil with a flash point >200℃. The composite emulsifying component is composed of sodium dodecylbenzene sulfonate and octylphenol polyoxyethylene ether with a carboxyl group of 44-54 mg KH / g. The anti-corrosion component is a compound of benzotriazole and methyl diethanolamine. The mass fraction range of each component is as follows: naphthenic base oil 40.0-60.0 parts, polyalkyl benzyl sulfide 2.0-6.0 parts, sulfurized vegetable oil 15.0-25.0 parts, sodium dodecylbenzene sulfonate 3.0-7.0 parts, octylphenol polyoxyethylene ether 8.0-12.0 parts, benzotriazole 0.2-1.0 parts, methyl diethanolamine 0.3-1.2 parts; The synergistic effect of the components gives the expansion oil chlorine-free environmental protection properties as well as excellent extreme pressure anti-wear, emulsification stability and anti-corrosion performance.

2. The high extreme pressure anti-wear emulsified expanding oil according to claim 1, characterized in that, The naphthenic base oil meets the following performance indicators: kinematic viscosity at 40℃ 350-400 mm² / s, open flash point ≥200℃, 260nm UV absorption ≤0.35, evaporation loss at 107℃ / 22h ≤0.5%, carbon form analysis CA ≤2.0% and CN ≥35%.

3. The high extreme pressure anti-wear emulsified expanding oil according to claim 1, characterized in that, The polyalkylbenzyl sulfide is generated by reacting benzyl halide with sodium sulfide under specific conditions, and has the following molecular formula: (C6H5CH2)n(S)n (n is the degree of polymerization, R is a 1-6 carbon alkyl group), and satisfies the following conditions: sulfur content 20-30%, kinematic viscosity at 40℃ ≥150mm² / s.

4. The high extreme pressure anti-wear emulsified expanding oil according to claim 1, characterized in that, The sulfurized vegetable oil has a closed-cup flash point ≥200℃ and a moisture content (m / m) ≤0.2%.

5. The high extreme pressure anti-wear emulsified expanding oil according to claim 1, characterized in that, The octylphenol polyoxyethylene ether satisfies the following requirements: carboxyl value 44-54 mgKH / g, moisture content (m / m) ≤ 2.0%, and acid value ≤ 2.0 mgKH / g.

6. The high extreme pressure anti-wear emulsified expanding oil according to claim 1, characterized in that, The 3% emulsion of the expansion oil can be stably stored for ≥2 weeks, the foam disappears within 30 seconds, the maximum non-seizing load is >1800N, the sintering load is >4500N, and the copper sheet corrosion grade is ≤1b.

7. The high extreme pressure anti-wear emulsified expanding oil according to claim 1, characterized in that, It is suitable for the expansion of large-diameter straight seam steel pipes made of Q235A, 16Mn, and X70 / X80 materials, and is also suitable for heavy-duty cold forming processes such as metal drawing and bending.

8. A method for preparing a high extreme pressure anti-wear emulsified expanding oil, applied to the high extreme pressure anti-wear emulsified expanding oil according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Under normal temperature conditions, add the naphthenic base oil to the stirring equipment, add benzotriazole and methyldiethanolamine, and stir at 300-500 r / min for 30-40 min until completely dissolved; S2. Raise the system temperature to 55-65℃, add polyalkylbenzyl sulfide and sulfurized vegetable oil, and adjust the speed to 600-800r / min and stir for 1-1.5h; S3. Maintain a temperature of 55-65℃, add sodium dodecylbenzenesulfonate and octylphenol polyoxyethylene ether, stir for 1-1.5h and then keep warm for 2-3h. S4. Cool to room temperature and filter through a 200-mesh filter to obtain the finished product.

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