Oil-gas lubricating oil applied to cold rolling mill
By using a specific ratio of oil-air lubricating oil composition in cold rolling mills, problems such as bearing wear, heat dissipation, and contamination protection have been solved, achieving efficient lubrication, cooling, and protection, extending equipment life, and reducing costs.
Patent Information
- Application Number
- CN202512012368.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-03-20
AI Technical Summary
Existing oil-air lubrication technology in cold rolling mills suffers from problems such as bearing wear, corrosion, difficulty in heat dissipation, and insufficient pollution protection, which are particularly difficult to solve effectively under high-temperature and heavy-load conditions.
Oil-gas lubricating oil, composed of synthetic esters, emulsifiers, phosphide anti-wear agents, sulfide extreme pressure friction reducers, metal deactivators, and rust inhibitors in specific proportions, forms a highly efficient lubrication, cooling, and protection system through precise mixing and stirring, providing all-round protection.
It achieves efficient lubrication, powerful cooling, and positive pressure sealing, reducing wear and corrosion, extending equipment maintenance cycles, and lowering operating costs.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of lubricating oil technology, and more particularly to an oil-air lubricating oil for use in cold rolling mills. Background Technology
[0002] Oil-air lubrication is a micro-lubrication technology that does not produce oil mist. Instead, it combines a fixed amount of lubricating oil and a continuous airflow in a mixing block to form a two-phase flow, which is then delivered to the lubrication point through pipelines.
[0003] In high-speed cold rolling mills, the bearings of the support rolls and work rolls operate under extremely harsh conditions of high temperature, heavy load, and high speed. Traditional oil bath lubrication or circulating oil lubrication has limitations: high heat generation from agitation (at high speeds, the oil itself generates a large amount of heat); difficulty in heat dissipation, as heat is not quickly removed, leading to increased bearing temperature; and easy leakage, contaminating the rolling oil and cooling water. Oil-air lubrication perfectly solves these problems: extremely low oil consumption: precisely supplying the bearing with the required amount of lubricating oil, reducing lubricating oil consumption and heat generation; excellent cooling effect: continuous compressed air effectively removes the enormous heat generated by the bearing, which is its core advantage; positive pressure to prevent contamination: maintaining positive pressure inside the bearing housing effectively prevents the intrusion of external emulsions, water, and iron oxide scale; suitable for high-speed conditions with almost no agitation loss.
[0004] The core service targets of oil-air lubricants are the roll bearings of cold rolling mills, especially the support rolls and work rolls. These bearings operate under extremely harsh conditions of high speed, heavy load, and high temperature. Oil-air lubricants, through a sophisticated oil-air lubrication system, provide protection for these critical components. It is the "lifeblood" ensuring the stable, efficient, and continuous operation of modern high-speed cold rolling mills, playing a vital and irreplaceable role. Its main functions can be summarized into four core features: 1. High-efficiency lubrication, reducing wear. 2. Powerful cooling, controlling temperature rise. 3. Positive pressure sealing, preventing contamination. 4. Precise delivery, clean and efficient. Therefore, oil-air lubricants and their systems are one of the fundamental prerequisites for ensuring the high-speed, high-precision, high-reliability, and long-term stable operation of cold rolling mills. Selecting the correct oil-air lubricant and maintaining the lubrication system are crucial aspects of cold rolling production management. During the cold rolling process, a large amount of rolling oil is used between the rolls and the strip for process cooling and lubrication. Inevitably, a small amount of emulsion will splash or seep into the bearing housing.
[0005] Oil-based lubricating oils are generally composed of high-quality base oils, blended with high-end synthetic esters, and supplemented with high-performance additives such as extreme pressure anti-wear, antioxidant, and anti-foaming agents. Slight changes in some additives can lead to significant differences in performance, and consequently, substantial variations in cost and price.
[0006] Currently, synthetic esters include polyol esters, complex esters, diesters, and phosphate esters. Polyol esters possess excellent thermal stability, oxidation stability, and lubricity, but are expensive and require careful consideration of sealing compatibility. Complex esters offer the best overall performance balance but are the most expensive. Diesters have good low-temperature performance and lower cost, but suffer from poor thermal stability and hydrolytic stability. Phosphate esters exhibit extreme pressure flame retardancy, but have poor material compatibility and raise environmental concerns. Summary of the Invention
[0007] The present invention proposes an oil-gas lubricating oil for use in cold rolling mills, which has excellent lubricity and top-notch thermal stability and oxidation stability. At the same time, the selected synthetic ester is harmless to the human body and environmentally friendly, and has good biodegradability and low toxicity.
[0008] Therefore, on the one hand, the present invention provides an oil-gas lubricating oil for use in cold rolling mills, comprising the following components by weight percentage:
[0009] Synthetic esters 45%-52%,
[0010] Emulsifier compound 4%–8%,
[0011] Phosphate anti-wear compound 1.5%-4%,
[0012] 7.5%-15% sulfide extreme pressure friction reducer compound
[0013] Metal deactivating agent 0.75%-1.25%,
[0014] Rust inhibitor 0.25%-0.75%,
[0015] Mineral base oil 20%-40%.
[0016] As a further description of the above technical solution:
[0017] The synthesized ester comprises 53.6% trimethylolpropane, 16.1% oleic acid, 19.06% coconut oil acid, and 11.24% dimer acid.
[0018] As a further description of the above technical solution:
[0019] The emulsifier compound is a nonionic surfactant or an ionic surfactant.
[0020] Specifically, the content of nonionic surfactants is 2%-4%, and the content of cationic surfactants is 2%-4%.
[0021] Preferably, the nonionic surfactant is at least one of NP-4, NP-6, or NP-10, and the cationic surfactant is at least one of T-5, T-10, T-15, C-5, C-10, or C-15.
[0022] As a further description of the above technical solution:
[0023] The phosphate anti-wear agent compound includes trimethyl phosphate T306 and Lubrizol 360-P.
[0024] The content of T306 trimethyl phosphate is 1%-2.5%, and the content of Lubrizol 360-P is 0.5%-1.5%.
[0025] As a further description of the above technical solution:
[0026] The sulfide extreme pressure friction reducer compound includes sulfide fatty acid esters, octadecenyl phosphite, and sulfide olefins.
[0027] The content of sulfurized fatty acid esters is 2%-6%, the content of octadecenyl phosphite is 3%-6%, and the content of sulfurized olefins is 2%-3%.
[0028] As a further description of the above technical solution:
[0029] The metal deactivator includes at least one of BASF L135 and BASF L57.
[0030] The content of BASF L135 is 0.1%-0.8%, and the content of BASF L57 is 0.2%-0.6%.
[0031] As a further description of the above technical solution:
[0032] The rust inhibitor includes at least one of cyclohexylamine, dicyclohexylamine, isopropanolamine, and diethylene glycolamine.
[0033] The contents of cyclohexylamine, dicyclohexylamine, isopropanolamine, and diethylene glycolamine are 0.25%-0.75%, respectively.
[0034] As a further description of the above technical solution:
[0035] The mineral base oil is at least one of 150BS and 500SN 10%-30%.
[0036] The content of 150BS is 10%-30%; the content of 500SN is 10%-30%.
[0037] On the other hand, the present invention discloses a method for preparing an oil-gas lubricating oil for use in cold rolling mills, which includes the following steps:
[0038] 1) Prepare all materials according to the above proportions;
[0039] 2) Add mineral base oil, synthetic ester and emulsifier compound to a clean container and mix. Stir at 60°C for 2 hours to obtain a mixture.
[0040] 3) Add phosphate anti-wear compound, sulfide extreme pressure friction reducer compound, metal deactivator and rust inhibitor to the mixture and stir at low speed until uniform to obtain lubricating oil.
[0041] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:
[0042] 1. In this invention, the selection and proportion of synthetic esters ensure that the oil-gas lubricating oil has excellent lubricity and top-notch thermal stability and oxidation stability. At the same time, the selected synthetic esters are harmless to the human body and environmentally friendly, with good biodegradability and low toxicity. The selection and proportion of phosphorus and sulfur agents ensure that the oil-gas lubricating oil has excellent extreme pressure anti-wear properties. Phosphates often work synergistically with sulfur extreme pressure agents to form a classic "sulfur-phosphorus" synergistic system, providing comprehensive protection for bearings from boundary lubrication to extreme pressure lubrication.
[0043] 2. In this invention, the synthetic ester provides top-level lubrication protection through its polar adsorption film. With its stable molecular structure, it resists high temperatures and oxidation, and its excellent viscosity-temperature characteristics allow it to adapt to a wide range of operating temperatures. This effectively improves equipment reliability, extends maintenance cycles, and reduces overall operating costs. The emulsifier compound provides compatibility with rolling oil during the production process. The phosphide anti-wear compound provides a robust "armor" for the bearing by generating an iron phosphate chemical reaction film, fundamentally reducing material wear and loss. It is an irreplaceable key component in high-quality oil-gas lubricating oils.
[0044] 3. In this invention, the sulfide extreme pressure friction reducer is specifically designed to cope with instantaneous, impactful extreme loads; the metal deactivator, through continuous and silent preventative action, prevents corrosion of equipment by forming a film on the metal surface; and significantly extends the service life of the lubricating oil and keeps the system clean by chelating metal ions, inhibiting oxidation, and protecting the oil itself. Dicyclohexylamine, isopropanolamine, and diethylene glycolamine, as rust inhibitors, provide excellent rust prevention properties for oil-gas lubricating oils, while also possessing excellent detergency. The base oil directly provides the core lubricating, cooling, cleaning, and protective functions of the lubricating oil, providing a platform and carrier for all functional additives to function. Detailed Implementation
[0045] Exemplary embodiments of this disclosure will now be described in more detail. While exemplary embodiments of this disclosure have been shown, it should be understood that this disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.
[0046] Example 1:
[0047] The mixture contains 45% synthetic ester; 4% emulsifier compound; 4% phosphate anti-wear compound; 15% sulfide extreme pressure friction reducer compound; 1.25% metal deactivator; 0.75% rust inhibitor; and 30% mineral base oil.
[0048] The preparation method includes the following steps:
[0049] 1) Based on the above proportions, prepare the materials for the preparation of the oil-gas lubricating oil to be used in the cold rolling mill;
[0050] 2) Mix the prepared materials at 60°C and stir for 2 hours.
[0051] in:
[0052] The synthetic ester comprises 53.6% trimethylolpropane, 16.1% oleic acid, 19.06% coconut oil acid, and 11.24% dimer acid.
[0053] The emulsifier blend includes the nonionic NP-4, 2% and the cationic T-5, 2%;
[0054] The phosphate anti-wear compound includes trimethyl phosphate T306, 2% and Lubrizol 360-P, 2%;
[0055] The compound of sulfide extreme pressure friction reducer includes 6% sulfide fatty acid ester, 3% octadecenyl phosphite, and 3% sulfide olefin;
[0056] Metal deactivators include BASF L135, 0.25% and BASF L57, 1%;
[0057] The rust inhibitor is 0.75% of the organic amine diethylene glycol amine;
[0058] Mineral base oils include 150BS 10% and 500SN 20%.
[0059] Example 2:
[0060] The mixture contains 52% synthetic ester; 8% emulsifier compound; 1.5% phosphate anti-wear compound; 7.5% sulfide extreme pressure friction reducer compound; 0.75% metal deactivator; 0.25% rust inhibitor; and 30% mineral base oil.
[0061] The preparation method includes the following steps:
[0062] 1) Based on the above proportions, prepare the materials for the preparation of the oil-gas lubricating oil to be used in the cold rolling mill;
[0063] 2) Mix the prepared materials at 60°C and stir for 2 hours.
[0064] in:
[0065] The synthetic ester comprises 53.6% trimethylolpropane, 16.1% oleic acid, 19.06% coconut oil acid, and 11.24% dimer acid.
[0066] The emulsifier blend includes nonionic NP-4, 4% and cationic T-5, 4%;
[0067] The phosphate anti-wear compound includes trimethyl phosphate (T306), 1%, and Lubrizol 360-P, 0.5%.
[0068] The compound of sulfide extreme pressure friction reducer includes 3% sulfide fatty acid ester, 3% octadecenyl phosphite, and 1.5% sulfide olefin;
[0069] Metal deactivators include BASF L135, 0.25% and BASF L57, 0.5%;
[0070] The rust inhibitor is 0.25% of the organic amine diethylene glycol amine;
[0071] Mineral base oils include 150BS 10% and 500SN 20%.
[0072] Example 3:
[0073] The formula includes 47% synthetic esters; 7% emulsifier compound; 2% phosphate anti-wear compound; 12.5% sulfide extreme pressure friction reducer compound; 1% metal deactivator; 0.5% rust inhibitor; and 30% mineral base oil.
[0074] The preparation method includes the following steps:
[0075] 1) Based on the above proportions, prepare the materials for the preparation of the oil-gas lubricating oil to be used in the cold rolling mill;
[0076] 2) Mix the prepared materials at 60°C and stir for 2 hours.
[0077] in:
[0078] The synthetic ester comprises 53.6% trimethylolpropane, 16.1% oleic acid, 19.06% coconut oil acid, and 11.24% dimer acid.
[0079] The emulsifier blend includes the nonionic NP-4, 4% and the cationic T-10, 3%;
[0080] The phosphate anti-wear compound consists of 1% trimethyl phosphate (T306) and 1% Lubrizol 360-P.
[0081] The compound of sulfide extreme pressure friction reducer includes 5% sulfide fatty acid ester, 5% octadecenyl phosphite, and 2.5% sulfide olefin;
[0082] The sulfide extreme pressure friction damping agent compound includes sulfide fatty acid esters, octadecenyl phosphite esters, and sulfide olefins.
[0083] Metal deactivators include BASF L135, 0.5% and BASF L57, 0.5%;
[0084] The rust inhibitor is 0.5% dicyclohexylamine;
[0085] Mineral base oils include 150BS 10% and 500SN 20%.
[0086] Example 4:
[0087] The formula includes 50% synthetic ester; 5% surfactant compound; 3% phosphide anti-wear compound; 10.5% sulfide extreme pressure friction reducer compound; 1% metal deactivator; 0.5% rust inhibitor; and 30% mineral base oil.
[0088] The preparation method includes the following steps:
[0089] 1) Based on the above proportions, prepare the materials for the preparation of the oil-gas lubricating oil to be used in the cold rolling mill;
[0090] 2) Mix the prepared materials at 60°C and stir for 2 hours.
[0091] in:
[0092] The synthetic ester comprises 53.6% trimethylolpropane, 16.1% oleic acid, 19.06% coconut oil acid, and 11.24% dimer acid.
[0093] The emulsifier blend includes the nonionic NP-6, 3% and the cationic T-5, 2%;
[0094] The phosphate anti-wear compound includes 1.5% trimethyl phosphate (T306) and 1.5% Lubrizol 360-P.
[0095] The compound of sulfide extreme pressure friction reducer includes 5% sulfide fatty acid ester, 5% octadecenyl phosphite, and 0.5% sulfide olefin;
[0096] Metal deactivators include BASF L135, 0.5% and BASF L57, 0.5%;
[0097] The rust inhibitor is 0.5% dicyclohexylamine;
[0098] Mineral base oils include 150BS 30%.
[0099] Example 5:
[0100] The mixture contains 48.5% synthetic ester; 6.5% surfactant compound; 2.5% phosphide anti-wear compound; 11% sulfide extreme pressure friction reducer compound; 1% metal deactivator; 0.5% rust inhibitor; and 30% mineral base oil.
[0101] The preparation method includes the following steps:
[0102] 1) Based on the above proportions, prepare the materials for the preparation of the oil-gas lubricating oil to be used in the cold rolling mill;
[0103] 2) Mix the prepared materials at 60°C and stir for 2 hours.
[0104] in:
[0105] The synthetic ester comprises 53.6% trimethylolpropane, 16.1% oleic acid, 19.06% coconut oil acid, and 11.24% dimer acid.
[0106] The emulsifier compound includes nonionic NP-10, 4% and cationic C-10, 2.5%.
[0107] The phosphate anti-wear compound includes 1.5% trimethyl phosphate (T306) and 1% Lubrizol 360-P.
[0108] The compound of sulfide extreme pressure friction reducer includes 5% sulfide fatty acid ester, 5% octadecenyl phosphite, and 1% sulfide olefin.
[0109] Metal deactivators include BASF L135, 0.5% and BASF L57, 0.5%.
[0110] The rust inhibitor is 0.5% diethylene glycolamine;
[0111] Mineral base oils include 30% 500SN.
[0112] The experimental data of Examples 1-5 and the comparative examples are compared in the table below:
[0113]
[0114] Based on the above comparison, it can be seen that Examples 1 to 5 have achieved improvements in lubricity and extreme pressure anti-wear properties compared to the comparative examples (prior art). At the same time, costs have been controlled and reduced.
[0115] Therefore, the oil-gas lubricating oil for cold rolling mills and its preparation method provided in this embodiment have the following advantages compared to the prior art:
[0116] 1. Excellent load-bearing and wear-resistant properties reduce wear between steel-steel components and ensure normal equipment operation.
[0117] 2. Excellent anti-corrosion, anti-rust, and water-separating properties can protect equipment from rust.
[0118] 3. Strengthen wear protection for gears to prevent micro-pitting.
[0119] 4. Reduce pitting caused by wear particles.
[0120] 5. Excellent antioxidant and thermal degradation resistance.
[0121] 6. Excellent resistance to sludge and deposit formation.
[0122] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. An oil-gas lubricating oil for use in cold rolling mills, characterized in that, Includes the following components by weight percentage: Synthetic esters 45%-52%, Emulsifier compound 4%–8%, Phosphate anti-wear compound 1.5%-4%, 7.5%-15% sulfide extreme pressure friction reducer compound Metal deactivating agent 0.75%-1.25%, Rust inhibitor 0.25%-0.75%, Mineral base oil 20%-40%.
2. The oil-gas lubricating oil for use in cold rolling mills according to claim 1, characterized in that, The synthesized ester comprises 53.6% trimethylolpropane, 16.1% oleic acid, 19.06% coconut oil acid, and 11.24% dimer acid.
3. The oil-gas lubricating oil for use in cold rolling mills according to claim 1, characterized in that, The emulsifier compound is a nonionic surfactant or an ionic surfactant.
4. The oil-gas lubricating oil for use in cold rolling mills according to claim 1, characterized in that, The phosphate anti-wear agent compound includes trimethyl phosphate T306 and Lubrizol 360-P.
5. The oil-gas lubricating oil for use in cold rolling mills according to claim 1, characterized in that, The sulfide extreme pressure friction reducer compound includes sulfide fatty acid esters, octadecenyl phosphite, and sulfide olefins.
6. The oil-gas lubricating oil for use in cold rolling mills according to claim 1, characterized in that, The metal deactivator includes at least one of BASF L135 and BASF L57.
7. The oil-gas lubricating oil for use in cold rolling mills according to claim 1, characterized in that, The rust inhibitor includes at least one of cyclohexylamine, dicyclohexylamine, isopropanolamine, and diethylene glycolamine.
8. The oil-gas lubricating oil for use in cold rolling mills according to claim 1, characterized in that, The mineral base oil is at least one of 150BS and 500SN 10%-30%.
9. A method for preparing an oil-gas lubricating oil for use in cold rolling mills, characterized in that, Includes the following steps: 1) Prepare the materials according to the proportions described in any one of claims 1-8; 2) Add mineral base oil, synthetic ester and emulsifier compound to a clean container and mix. Stir at 60°C for 2 hours to obtain a mixture. 3) Add phosphate anti-wear compound, sulfide extreme pressure friction reducer compound, metal deactivator and rust inhibitor to the mixture and stir at low speed until uniform to obtain lubricating oil.