Stainless steel cold rolling oil composition with efficient lubrication and easy cleaning

Abstract

The invention relates to the technical field of rolling oil, and particularly discloses a stainless steel cold rolling oil composition with efficient lubrication and easy cleaning, which comprises the following components in percentage by weight: 58-77% of base oil; 10%-25% of synthetic ester lubricating oil; 5%-12% of an anti-wear reagent at extreme pressure; 3%-8% of an oiliness agent; 0.5%-2% of an antioxidant; 1%-3% of an antirust agent; 0.5%-2% of a surfactant; 1%-3% of a polyether dispersant; according to the rolling oil disclosed by the invention, the nano silicon dioxide and the polyether type dispersant are added into the rolling oil, so that oil film breakage at a high temperature can be effectively avoided, iron powder agglomeration is prevented, the rolling oil does not adhere to the surface of equipment, the cleaning performance is high, and the problems of oil sludge generation, nozzle blockage and equipment adhesion of traditional rolling oil are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of rolling oil technology, and more particularly to a high-efficiency, easy-to-clean stainless steel cold rolling oil composition. Background Technology

[0002] Stainless steel hot rolling is a plastic deformation process carried out under high temperature and high pressure conditions of 1000℃-1250℃. Intense friction and strong rolling forces exist between the rolls and the high-temperature steel strip, placing stringent requirements on the comprehensive performance of the rolling oil. Without effective lubrication and cleaning, the following problems may occur:

[0003] Increased rolling force and energy consumption: The excessively high coefficient of friction leads to an increase in the load on the main motor, resulting in a significant increase in electricity consumption per ton of steel; Increased roll wear: At high temperatures, fatigue cracks and spalling are easily generated on the surface of rolls, steel sticking occurs frequently, service life is shortened, and production costs increase. Product surface quality defects: Steel strips are prone to scratches, pitting, and iron oxide scale indentation, resulting in reduced smoothness and yield. Difficulty in controlling sheet shape: Uneven lubrication leads to abnormal thermal crown of the rolls, causing poor sheet shape such as waviness and warping; Equipment system contamination: Traditional rolling oil has poor high-temperature cleaning properties, easily producing sludge and carbon deposits, clogging nozzles and contaminating the cooling water system. At the same time, impurities such as iron powder agglomerate and adhere, exacerbating equipment wear.

[0004] Currently available stainless steel hot rolling oils have the following shortcomings: insufficient oil film strength at high temperatures, making them prone to rupture; insufficient extreme pressure anti-wear performance, making them unsuitable for operating conditions; weak high-temperature detergency and impurity dispersion capabilities, leading to iron powder agglomeration and sludge formation, resulting in excessive surface residue. Therefore, it is essential to develop a stainless steel hot rolling oil that combines excellent lubricity, extreme pressure anti-wear properties, high-temperature stability, and easy cleaning. Summary of the Invention

[0005] To address the problems mentioned in the background art, the present invention aims to provide a highly efficient and easy-to-clean stainless steel cold rolling oil composition.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A highly efficient, lubricating, and easy-to-clean stainless steel cold rolling oil composition, comprising the following components by weight percentage: Base oil 58%-77%; Synthetic ester lubricants: 10%-25%; Extreme pressure anti-wear agent 5%-12%; Oily agent 3%-8%; Antioxidant 0.5%-2%; Rust inhibitor 1%-3%; Surfactant 0.5%-2%; Polyether dispersant 1%-3%; Nano-silica 0.5%-2%.

[0007] Furthermore, the polyether-type dispersant is a polyoxyethylene polyoxypropylene block polyether with a molecular weight between 2000 and 8000. The molecular structure contains lipophilic and hydrophilic segments. The lipophilic segments can be adsorbed onto the surface of hydrophobic impurities such as iron powder, while the hydrophilic segments form a steric hindrance layer facing the aqueous phase. At the same time, the ether bonds on the molecular chain generate electrostatic repulsion with the amino groups, which can effectively prevent the agglomeration of impurity particles. Moreover, it has good stability at high temperatures and is not easily decomposed.

[0008] Furthermore, the base oil is a hydrotreated Group II or Group III light white oil with a kinematic viscosity of 8-15 mm² / s at 40°C, and features low sulfur, low aromatics, high saturation, light color, and good oxidation stability.

[0009] Furthermore, the synthesized lubricant is one or more of pentaerythritol ester, trimethylolpropane ester, or trimellitic acid ester, possessing strong polar adsorption capacity and excellent lubricity, high flash point, low volatility, and good biodegradability.

[0010] Furthermore, the extreme pressure anti-wear agent is one or more of thiophosphate esters, phosphate ester amine salts, or sulfided fatty acid esters. The extruded anti-wear agent can react with the metal surface at high temperature to generate a high-strength iron sulfide or iron phosphate protective film.

[0011] Furthermore, the oiling agent is one or more of fatty acid glycerides, fatty alcohols, or high molecular weight polyethers. The oiling agent can be physically adsorbed onto the metal surface to enhance the lubrication effect.

[0012] Furthermore, the antioxidant is a complex of phenolic antioxidants and amine antioxidants, which can effectively delay the oxidative deterioration of rolling oil during high-temperature cycling.

[0013] Furthermore, the rust inhibitor is one or more of alkenyl succinate half ester and boronized succinate, and the rust inhibitor is used to prevent corrosion of the strip steel and the water system of the rolling mill after rolling.

[0014] Furthermore, the surfactant is a nonionic surfactant with an HLB value between 8 and 12, and the surface dispersant ensures that the rolling oil is rapidly dispersed in water to form a stable emulsion.

[0015] The present invention also provides a method for preparing the rolling oil composition, the method comprising the following steps: a. Add base oil to the reactor, heat to 60℃±5℃, and start stirring at 150r / min; b. Add the synthetic ester lubricant and oiling agent in sequence, and stir until well mixed; c. Slowly add the extreme pressure anti-wear agent, antioxidant, and rust inhibitor, stirring at 150 rpm after each addition to ensure complete dissolution; d. Add polyether-type dispersant and nano-silica, and stir at 150 r / min for 30-50 minutes to ensure uniform dispersion of nanoparticles; e. Add the surfactant, adjust the stirring speed to 200 r / min, and continue stirring until the system is homogeneous and transparent; f. Cool to below 40°C and filter to obtain the finished rolling oil concentrate.

[0016] The beneficial effects of this invention are as follows: by adding nano-silica and polyether dispersant to the rolling oil, the nano-silica can fill the gaps in the oil film, reduce the coefficient of friction, and effectively prevent the oil film from breaking at high temperatures; the polyether dispersant causes the surface of impurity particles such as iron powder to be charged through electrostatic repulsion, preventing particle agglomeration and non-adhesion to the equipment surface, resulting in high cleaning performance and effectively solving the problems of sludge formation, nozzle clogging, and equipment adhesion in traditional rolling oil. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art are within the protection scope of the present invention.

[0018] Example 1 Prepare 1000 kg of rolling oil concentrate. The weights of each component are as follows: Base oil: Hydrogenated Group II white oil (10 mm² / s) 680 kg; Synthetic ester: Pentaerythritol ester 150kg; Anti-wear agent: 80 kg of sulfurized fatty acid ester; Oiliness agent: 40 kg of fatty acid glycerides; Antioxidant: (BHT: Alkyl diphenylamine = 1:1) 10kg; Rust inhibitor: Alkenyl succinate half ester 15kg; Surfactant: Fatty alcohol polyoxyethylene ether (HLB=10) 5kg; Polyether dispersant: 10 kg of polyoxyethylene polyoxypropylene block polyether; 5 kg of nano-silica (30 nm).

[0019] Hydrogenated Class II white oil was added to the reactor and heated to 65°C. Stirring was started at 150 rpm. Then, pentaerythritol ester and fatty acid glyceride were added sequentially and stirred for 30 minutes until homogeneous. Then, sulfurized fatty acid ester, BHT, alkyl diphenylamine, and alkenyl succinate half-ester were slowly added. After each component was added, stirring was started at 150 rpm for 20 minutes to ensure complete dissolution. Then, polyoxyethylene polyoxypropylene block polyether and nano-silica were added and stirred at 150 rpm for 30 minutes to ensure uniform dispersion of nanoparticles. Fatty alcohol polyoxyethylene ether was added, and the stirring speed was adjusted to 200 rpm. Stirring was continued until the system was homogeneous and transparent. The mixture was cooled to below 40°C and filtered to obtain the finished rolling oil concentrate.

[0020] Example 2 Prepare 1000 kg of rolling oil concentrate. The weights of each component are as follows: Base oil: Hydrogenated Group III white oil (10 mm² / s) 630 kg; Synthetic ester: 200 kg of trimethylolpropane ester; Anti-wear agent: 90 kg of thiophosphate and phosphate amine salt (1:1); Oiliness agent: 30 kg of high molecular weight polyether; Antioxidant: 15 kg of BHT and alkyl diphenylamine (1:1); Rust inhibitor: 15 kg of boronized succinate; Surfactant: 5 kg of nonionic surfactant (HLB=11); Polyether dispersant: 20 kg of polyoxyethylene polyoxypropylene block polyether; 15kg of nano-silica (30nm).

[0021] Hydrogenated Class III white oil was added to the reactor and heated to 65°C. Stirring was started at 150 rpm. Trimethylolpropane ester and high molecular weight polyether were added sequentially and stirred for 30 minutes until homogeneous. Thiophosphate ester and phosphate amine salt, BHT, alkyl diphenylamine, and boronized succinate were then slowly added. After each component was added, stirring was started at 150 rpm for 20 minutes to ensure complete dissolution. Polyoxyethylene polyoxypropylene block polyether and nano silica were then added and stirred at 150 rpm for 45 minutes to ensure uniform dispersion of nanoparticles. Nonionic surfactant was added, and the stirring speed was adjusted to 200 rpm. Stirring was continued until the system was homogeneous and transparent. The mixture was cooled to below 40°C and filtered to obtain the finished rolling oil concentrate.

[0022] Example 3 Prepare 1000 kg of rolling oil concentrate. The weights of each component are as follows: Base oil: Hydrogenated Group II white oil (10 mm² / s) 580 kg; Synthetic ester: Trimethicone ester 220kg; Anti-wear agent: 100 kg of thiophosphate and phosphate amine salt (1:1); Oiliness agent: 30 kg of fatty alcohol; Antioxidant: 10 kg of BHT and alkyl diphenylamine (1:1); Rust inhibitor: Alkenyl succinate half ester 20kg; Surfactant: Fatty alcohol polyoxyethylene ether (HLB=9) 10kg; Polyether dispersant: 30 kg of polyoxyethylene polyoxypropylene block polyether; 20kg of nano-silica (30nm).

[0023] Hydrogenated Class II white oil was added to the reactor and heated to 60°C. Stirring was started at 150 rpm. Triterpenoid ester and fatty alcohol were added sequentially and stirred for 30 minutes until homogeneous. Thiophosphate ester and phosphate ester amine salt, BHT, alkyl diphenylamine, and alkenyl succinate half-ester were then slowly added. After each component was added, stirring was started at 150 rpm for 20 minutes to ensure complete dissolution. Polyoxyethylene polyoxypropylene block polyether and nano silica were then added and stirred at 150 rpm for 50 minutes to ensure uniform dispersion of the nanoparticles. Fatty alcohol polyoxyethylene ether was added, and the stirring speed was adjusted to 200 rpm. Stirring was continued until the system was homogeneous and transparent. The mixture was cooled to below 40°C and filtered to obtain the finished rolling oil concentrate.

[0024] Comparative Example 1 Prepare 1000 kg of rolling oil concentrate. The weights of each component are as follows: Hydrogenated Group II white oil (10 mm² / s) 690 kg; 150 kg of pentaerythritol ester; 80 kg of sulfurized fatty acid esters; 40 kg of fatty acid glycerides; 10 kg of BHT and alkyl diphenylamine (1:1); 15 kg of alkenyl succinate half-ester; 5 kg of fatty alcohol polyoxyethylene ether (HLB=10).

[0025] Hydrogenated Group II white oil was added to the reactor and heated to 65°C. Stirring was started at 150 rpm. Then, pentaerythritol ester and fatty acid glycerides were added sequentially and stirred for 30 minutes until homogeneous. Then, sulfurized fatty acid ester, BHT, alkyl diphenylamine, and alkenyl succinate half-ester were slowly added. After each component was added, stirring was started at 150 rpm for 20 minutes to ensure complete dissolution. Fatty alcohol polyoxyethylene ether was added, and the stirring speed was adjusted to 200 rpm. Stirring was continued until the system was homogeneous and transparent. The mixture was cooled to below 40°C and filtered to obtain the finished rolling oil concentrate.

[0026] Comparative Example 2 Prepare 1000 kg of rolling oil concentrate. The weights of each component are as follows: Hydrogenated Group III white oil (10 mm² / s) 650 kg; 200 kg of trimethylolpropane; Thiophosphate ester and phosphate ester amine salt (1:1) 90kg; 30 kg of high molecular weight polyether; 15 kg of BHT and alkyl diphenylamine (1:1); 15 kg of borosilicate succinate; 5 kg of nonionic surfactant (HLB=11).

[0027] Hydrogenated Class III white oil was added to the reactor and heated to 65°C. Stirring was started at 150 rpm. Trimethylolpropane ester and high molecular weight polyether were added sequentially and stirred for 30 minutes until homogeneous. Thiophosphate ester and phosphate ester amine salt, BHT, alkyl diphenylamine, and boronized succinate were then slowly added. After each component was added, stirring was started at 150 rpm for 20 minutes to ensure complete dissolution. Nonionic surfactant was added, and the stirring speed was adjusted to 200 rpm. Stirring was continued until the system was homogeneous and transparent. The mixture was cooled to below 40°C and filtered to obtain the finished rolling oil concentrate.

[0028] Comparative Example 3 Prepare 1000 kg of rolling oil concentrate. The weights of each component are as follows: Hydrogenated Group II white oil (10 mm² / s) 600 kg; 220 kg of trimellitic acid ester; Thiophosphate ester and phosphate ester amine salt (1:1) 100kg; 30 kg of fatty alcohols; 15 kg of BHT and alkyl diphenylamine (1:1); 20 kg of alkenyl succinate half-ester; Fatty alcohol polyoxyethylene ether (HLB=11) 15kg.

[0029] Hydrogenated Class II white oil was added to the reactor and heated to 60°C. Stirring was started at 150 rpm. Triterpenoid ester and fatty alcohol were added sequentially and stirred for 30 minutes until homogeneous. Thiophosphate ester and phosphate ester amine salt, BHT, alkyl diphenylamine, and alkenyl succinate half-ester were then slowly added. After each component was added, stirring was started at 150 rpm for 20 minutes to ensure complete dissolution. Fatty alcohol polyoxyethylene ether was added, and the stirring speed was adjusted to 200 rpm. Stirring was continued until the system was homogeneous and transparent. The mixture was cooled to below 40°C and filtered to obtain the finished rolling oil concentrate.

[0030] The rolling oil concentrates obtained in Examples 1-3 and Comparative Examples 1-3 were prepared into emulsions with a concentration of 3% and subjected to the following tests: (a) Kinematic viscosity test at 40℃ The kinematic viscosity of the rolling oil concentrate diluted to a 3.0% emulsion at 40°C was determined according to GB / T265 standard and recorded. The viscosity was required to be no greater than 70 mm² / s.

[0031] (10) Four-ball test PB value test According to GB / T3142 standard, the maximum non-seize load (PB value) under test load should not be less than 588N.

[0032] (11) Rolling mill cleanliness test Prepare a 5% emulsion from the rolling oil concentrate of each example and the comparative example, and transfer 100 mL into a stoppered graduated cylinder; add 1 g of commercially available standard iron powder, seal the graduated cylinder, and place it in a 120℃ constant temperature oven, stirring at 200 r / min for 2 min; after stopping stirring, let it stand for 5 min, observe the suspension and agglomeration of the iron powder, and classify it according to the following standards: Level 1: Completely free to float, with no aggregation; Level 2: The iron powder in the foam is released rapidly, and the iron powder is in a coarsely dispersed state with no obvious agglomeration; Level 3: Iron powder shows slight agglomeration and general dispersibility; Level 4: The iron powder is severely agglomerated and adheres to the inner wall of the measuring cylinder.

[0033] The experimental results are shown in Table 1. Table 1 As shown in Table 1, nano-silica significantly enhances the anti-wear properties of rolling oil, and polyether-type dispersants can effectively prevent iron powder agglomeration, reduce the viscosity of rolling oil, and achieve a high level of cleaning performance.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A highly efficient, lubricating, and easy-to-clean stainless steel cold-rolling oil composition, characterized in that, By weight percentage, it includes the following components: Base oil 58%-77%; Synthetic ester lubricants: 10%-25%; Extreme pressure anti-wear agent 5%-12%; Oily agent 3%-8%; Antioxidant 0.5%-2%; Rust inhibitor 1%-3%; Surfactant 0.5%-2%; Polyether dispersant 1%-3%; Nano-silica 0.5%-2%.

2. The high-efficiency lubricating and easy-to-clean stainless steel cold rolling oil composition according to claim 1, characterized in that, The polyether-type dispersant is a polyoxyethylene polyoxypropylene block polyether.

3. The high-efficiency lubricating and easy-to-clean stainless steel cold rolling oil composition according to claim 1, characterized in that, The base oil is a hydrotreated Group II or Group III light white oil with a kinematic viscosity of 8-15 mm² / s at 40°C.

4. The high-efficiency lubricating and easy-to-clean stainless steel cold rolling oil composition according to claim 1, characterized in that, The synthesized lubricant is one or more of pentaerythritol ester, trimethylolpropane ester, or trimellitate.

5. The high-efficiency lubricating and easy-to-clean stainless steel cold rolling oil composition according to claim 1, characterized in that, The extreme pressure anti-wear agent is one or more of thiophosphate, phosphate ester amine salt, or sulfidated fatty acid ester.

6. The high-efficiency lubricating and easy-to-clean stainless steel cold rolling oil composition according to claim 1, characterized in that, The oiliness agent is one or more of fatty acid glycerides, fatty alcohols, or high molecular weight polyethers.

7. The high-efficiency lubricating and easy-to-clean stainless steel cold rolling oil composition according to claim 1, characterized in that, The antioxidant is a complex of phenolic antioxidants and amine antioxidants.

8. The high-efficiency lubricating and easy-to-clean stainless steel cold rolling oil composition according to claim 1, characterized in that, The rust inhibitor is one or more of alkenyl succinate half ester and boronized succinate.

9. The high-efficiency lubricating and easy-to-clean stainless steel cold rolling oil composition according to claim 1, characterized in that, The surfactant is a nonionic surfactant with an HLB value between 8 and 12.

10. A method for preparing the rolling oil composition according to any one of claims 1-9, characterized in that, Includes the following steps: a. Add base oil to the reactor, heat to 60℃±5℃, and start stirring at 150r / min; b. Add the synthetic ester lubricant and oiling agent in sequence, and stir until well mixed; c. Slowly add the extreme pressure anti-wear agent, antioxidant, and rust inhibitor, stirring at 150 rpm after each addition to ensure complete dissolution; d. Add polyether-type dispersant and nano-silica, and stir at 150 r / min for 30-50 minutes to ensure uniform dispersion of nanoparticles; e. Add the surfactant, adjust the stirring speed to 200 r / min, and continue stirring until the system is homogeneous and transparent; f. Cool to below 40°C and filter to obtain the finished rolling oil concentrate.

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