Rolling machine sealing bearing lubricating grease composition as well as preparation method and application thereof

Abstract

The invention discloses a rolling machine sealing bearing lubricating grease composition and a preparation method and application thereof, and belongs to the technical field of lubricating grease. In particular to a lubricating grease composition which is prepared from the following raw materials: a thickening agent, base oil, a tackifier, amide, an anti-wear reagent at extreme pressure, an antioxidant and an anti-rust agent, the amide is one or two of acrylamide, polyacrylamide, octadecanamide propyl dimethylamine, ethylene bis oleamide and bis (hydroxyethyl) ethylene bis stearamide. The lubricating grease composition can exert oil separation and oil recovery characteristics under different temperature conditions, provides efficient lubrication for a sealing bearing of a rolling machine, and prolongs the service life of the bearing; the water resistance is good, the emulsion is not easy to emulsify, the washing off is not easy, and the consistency change is small; good abrasion resistance is achieved, and abrasion caused after cold rolling liquid invades the bearing is avoided; and the steel plate has good shearing stability and high rolling requirements, and can meet the requirement that the rolling speed of rolling mill equipment exceeds 90 m / s.

Description

[0001] The present invention is application number CN202410804477.9, and the invention name is a divisional application for an invention patent for a rolling mill sealed bearing grease composition, preparation method and application. The original application date is June 21, 2024. Technical Field

[0002] The invention relates to the technical field of lubricating grease, and in particular to a lubricating grease composition for a rolling mill sealed bearing, a preparation method and an application thereof. Background Art

[0003] Since metallurgical enterprises have long production processes and complex equipment, coupled with their special working conditions (high temperature, high water content, high dust content, and heavy load), their requirements for grease are quite stringent.

[0004] Most of the bearings in metallurgical equipment work continuously in very harsh environments such as high temperature, high load and large amount of cooling water. The mechanical elements that constitute metallurgical equipment are required to ensure high reliability and high durability, and the same is true for grease as one of these mechanical elements. In recent years, with the introduction of a large number of advanced equipment from abroad, the requirements for grease have become increasingly stringent. In order to meet this requirement, various types of high-performance grease are required for bearings in metallurgical equipment. In addition, from the perspective of environmental protection, in order to reduce the amount of waste grease, it is also required to develop in the direction of long-life high-performance grease.

[0005] The grease for the roll neck seal bearing of the cold rolling mill must be able to separate and recollect the base oil under certain temperature conditions, thereby providing the same function as the lubricating oil. Combined with the operating conditions of the cold rolling mill, the grease in the bearing is under harsh lubrication conditions of being immersed in the cold rolling fluid for a long time, requiring the grease to meet the following requirements: good water resistance, anti-wear performance, shear resistance, corrosion resistance and extreme pressure performance. Summary of the invention

[0006] In view of the gap in the prior art, the object of the present invention is to provide a lubricating grease composition. The lubricating grease composition can meet the special working condition requirements of the sealed bearing part of the rolling mill. The present invention also provides a preparation method and application of the lubricating grease composition.

[0007] Aiming at the special working conditions of rolling mills in the metallurgical industry, the present invention optimizes the grease composition and its preparation process so that the grease composition can be industrially produced and suitable for roll neck sealed bearings of hot rolling and cold rolling mills, thereby solving the problem that previous greases cannot lubricate under high PV lubrication conditions.

[0008] During the research and development process, it was found that by adding amide substances, the grease can withstand the harsh operating conditions of large sealed bearings, solve the high PV resistance conditions of the grease, improve the lubrication performance, reach the oil lubrication level at high temperatures, and restore the grease state at low temperatures; add an appropriate amount of viscosity enhancer to improve the water resistance and adhesion performance of the grease; and then add an appropriate amount of additives to enhance the extreme pressure, anti-wear and anti-rust properties of the grease.

[0009] Specifically, the present invention provides the following technical solutions:

[0010] The invention provides a lubricating grease composition, which is prepared from raw materials comprising the following components: a thickener, a base oil, a tackifier, an amide, an extreme pressure anti-wear agent, an antioxidant and a rust inhibitor.

[0011] Specifically, the raw materials for preparing the grease composition include the following components in parts by weight: 8-13 parts of thickener, 70-80 parts of base oil, 3-5 parts of tackifier, 3-8 parts of amide, 3-6 parts of extreme pressure anti-wear agent, 0.5-3 parts of antioxidant, and 0.2-2.0 parts of rust inhibitor.

[0012] The thickener described above is prepared by reacting 12-hydroxystearic acid, a dibasic acid and lithium hydroxide, wherein the dibasic acid can be one or both of azelaic acid and sebacic acid. The mass ratio of 12-hydroxystearic acid to the dibasic acid is 5:1 to 1:1, preferably, the mass ratio of 12-hydroxystearic acid to the dibasic acid is 4:1 to 3:1.

[0013] The base oil mentioned above is one or more of mineral oil or synthetic oil.

[0014] The kinematic viscosity of the base oil at 40°C is 100-300 mm 2 / s, preferably 200-300 mm 2 / s. The base oil type and viscosity used in the present invention can be well matched with the thickener in the system to meet the low temperature use requirement of -20°C.

[0015] The above-mentioned tackifier is selected from EPDM rubber or EPDM rubber or a mixture of the two. The mass ratio of the tackifier to the base oil is (0.01-0.05): 1. The tackifier used in the present invention can increase the adhesion of the grease composition and avoid being washed away by the cold rolling liquid during use, which affects its lubrication performance.

[0016] The amide described above is a mixture of one or two selected from acrylamide, polyacrylamide, stearic acid amide propyl dimethylamine, ethylene bisoleic acid amide, and bishydroxyethyl ethylene bisstearic acid amide. The mass ratio of the amide to the base oil is (0.01-0.1):1. Preferably, the mass ratio of the amide to the base oil is (0.03-0.8):1. The amide used in the present invention can exert oil separation and oil recovery characteristics under certain temperature conditions, solving the problem of lubrication of the rolling mill roll neck seal bearing.

[0017] The extreme pressure anti-wear agent mentioned above is a mixture of one or more selected from dialkyl dithiocarbamate, dialkyl dithiocarbamate molybdenum, calcium carbonate and dialkyl dithiophosphate zinc.

[0018] Preferably, the extreme pressure anti-wear agent is a dialkyl dithiocarbamate and a molybdenum dialkyl dithiocarbamate in a mass ratio of (0.5-1):1, or a molybdenum dialkyl dithiocarbamate and calcium carbonate in a mass ratio of 1:(0.5-2.0), or a dialkyl dithiocarbamate, a molybdenum dialkyl dithiocarbamate and a zinc dialkyl dithiophosphate in a mass ratio of 1:(1.0-2.0):(0.5-1.5).

[0019] Furthermore, the raw materials of the grease composition of the present invention also include an antioxidant with a mass percentage of 0.5-3%, and the antioxidant is a mixture of 3,5-di-tert-butyl-4-hydroxytoluene and octylbutyldiphenylamine.

[0020] The above-mentioned rust inhibitor is 0.2-2.0 parts of a thiadiazole derivative.

[0021] The lubricating grease composition provided by the present invention can be used as a lubricating grease for a rolling mill sealed bearing.

[0022] The present invention also provides a method for preparing the grease composition, which comprises the following steps: subjecting a thickener raw material to a saponification reaction in part of the base oil, subjecting the remaining base oil to a high-pressure homogenization treatment after cooling, and then adding an extreme pressure anti-wear agent, a tackifier, an antioxidant and a rust inhibitor and then subjecting the resulting oil to a shearing treatment.

[0023] The present invention also provides a method for preparing the grease composition, which comprises the following steps:

[0024] Mix the base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid, raise the temperature to 80-90°C, add lithium hydroxide solution accounting for 30-50% of the total amount of lithium hydroxide to start the reaction, and the reaction time is 45-60 minutes; control the temperature at 90-100°C to add the dibasic acid, stir for 30-50 minutes, and then start to drop the remaining lithium hydroxide solution at 95-100°C; after the reaction is completed, stir and heat to 130-140°C, keep the temperature constant for 30-45 minutes; continue to heat to 190-205 ℃, add base oil accounting for 1 / 3 of the total base oil amount, cool down the temperature to 160-190℃, keep constant temperature for 15-30min, then add amide; when the temperature drops to 140-150℃, add all antioxidants and remaining base oil, drop the temperature to 100-120℃, use 18-22MPa high-pressure homogenizer for dispersion treatment, drop the temperature to below 80℃, add extreme pressure anti-wear agent, tackifier, rust inhibitor, stir evenly, and then use 0.8mm orifice plate and 0.5mm orifice plate for shear treatment for 120min, filter and degas, and can the finished product.

[0025] The invention also provides application of the lubricating grease composition in a rolling mill sealed bearing.

[0026] The beneficial effects of the present invention are as follows: the grease composition provided by the present invention is combined with the operating conditions of the cold rolling mill, and the grease in the bearing is under the harsh lubrication conditions of being immersed in the cold rolling fluid for a long time, and has at least the following advantages:

[0027] 1) Good water resistance: not easy to emulsify, not easy to wash off, and small change in consistency;

[0028] 2) Anti-wear performance: prevent cold rolling fluid from invading the bearing and causing wear;

[0029] 3) Shear resistance: The rolling requirements of cold rolling equipment are relatively high, and the rolling speed of high-speed wire exceeds 90m / s, which has good shear stability;

[0030] 4) Due to the addition of amide, the oil separation and oil recovery characteristics can be exerted under different temperature conditions, providing efficient lubrication for the bearing and extending the bearing life. DETAILED DESCRIPTION

[0031] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product instructions are used.

[0032] In the present invention, the instruments and the like used without indicating the manufacturer are all conventional products that can be purchased through regular channels. The raw materials used in the present invention can be conveniently purchased in the domestic product market.

[0033] Example 1

[0034] Thickener: 200 kg, composed of 12-hydroxystearic acid, sebacic acid and lithium hydroxide, wherein the mass ratio of 12-hydroxystearic acid to sebacic acid is 3:1; lithium hydroxide: 30 kg;

[0035] Base oil: 1800kg (PAO synthetic oil: 60%, 150BS: 40%, base oil kinematic viscosity at 40°C: 160mm2 / s);

[0036] Tackifier: EPDM rubber 80kg;

[0037] Amide: acrylamide 80kg;

[0038] Extreme pressure anti-wear agent: 30kg dialkyl dithiocarbamate, 40kg molybdenum dialkyl dithiocarbamate;

[0039] Antioxidant: 3,5-di-tert-butyl-4-hydroxytoluene 10kg, octylbutyl diphenylamine 10kg;

[0040] Rust inhibitor: 8 kg of thiadiazole derivative.

[0041] This embodiment also provides a method for preparing the above grease composition, which is as follows:

[0042] The base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid are mixed, the temperature is raised to 87°C, and a lithium hydroxide solution accounting for 35% of the total amount of lithium hydroxide is added to start the reaction, and the reaction time is 50 minutes; the temperature is controlled at 95°C, the dibasic acid is added, and after stirring for 35 minutes, the remaining lithium hydroxide solution is added dropwise at a temperature of 97°C; after the reaction is completed, the mixture is heated to 135°C with stirring and kept at a constant temperature for 40 minutes; the mixture is continued to be heated to 202°C, and the base oil accounting for 1 / 3 of the total amount of base oil is added to cool down, the temperature is reduced to 182°C, and the amide is added after the temperature is maintained at a constant temperature for 15 minutes; the temperature is reduced to 147°C, all antioxidants and the remaining base oil are added, the temperature is reduced to 117°C, and a 21MPa high-pressure homogenizer is used for dispersion treatment, the temperature is reduced to 78°C, extreme pressure anti-wear agent, tackifier, antioxidant and rust inhibitor are added, and after stirring evenly, a 0.8mm orifice plate and a 0.5mm orifice plate are used for shear treatment for 120 minutes, and the finished product is canned after filtration and degassing.

[0043] Example 2

[0044] Thickener: 200 kg, composed of 12-hydroxystearic acid, sebacic acid and lithium hydroxide, wherein the mass ratio of 12-hydroxystearic acid to sebacic acid is 3:1; lithium hydroxide: 30 kg;

[0045] Base oil: 1800kg (PAO synthetic oil: 50%, 150BS: 50%, base oil kinematic viscosity at 40°C: 193mm2 / s);

[0046] Tackifier: EPDM rubber 80kg;

[0047] Amide: polyacrylamide 100kg;

[0048] Extreme pressure anti-wear agent: 40kg of dialkyl dithiocarbamate molybdenum, 60kg of calcium carbonate;

[0049] Antioxidant: 3,5-di-tert-butyl-4-hydroxytoluene 15kg, octylbutyl diphenylamine 10kg;

[0050] Rust inhibitor: 7 kg of thiadiazole derivative.

[0051] This embodiment also provides a method for preparing the above grease composition, which is as follows:

[0052] The base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid are mixed, the temperature is raised to 84°C, and a lithium hydroxide solution accounting for 40% of the total amount of lithium hydroxide is added to start the reaction, and the reaction time is 45 minutes; the temperature is controlled at 95°C, the dibasic acid is added, and after stirring for 38 minutes, the remaining lithium hydroxide solution is added dropwise at a temperature of 96°C; after the reaction is completed, the mixture is heated to 136°C with stirring and kept at a constant temperature for 37 minutes; the mixture is heated to 203°C, and the base oil accounting for 1 / 3 of the total amount of base oil is added to cool down, the temperature drops to 183°C, and the amide is added after the temperature is kept at a constant temperature for 16 minutes; the temperature drops to 147°C, all antioxidants and the remaining base oil are added, the temperature drops to 117°C, and a 20MPa high-pressure homogenizer is used for dispersion treatment, the temperature drops to 77°C, extreme pressure anti-wear agent, tackifier, antioxidant and rust inhibitor are added, and after stirring evenly, a 0.8mm orifice plate and a 0.5mm orifice plate are used for shear treatment for 120 minutes, and the finished product is canned after filtration and degassing.

[0053] Example 3

[0054] Thickener: 200 kg, composed of 12-hydroxystearic acid, sebacic acid and lithium hydroxide, wherein the mass ratio of 12-hydroxystearic acid to sebacic acid is 3:1; lithium hydroxide: 30 kg;

[0055] Base oil: 1800kg (PAO synthetic oil: 30%, 150BS: 70%, base oil kinematic viscosity at 40°C: 278mm2 / s);

[0056] Tackifier: EPDM rubber 90kg;

[0057] Amide: stearic acid amide propyl dimethylamine 100kg;

[0058] Extreme pressure anti-wear agent: 40kg of dialkyl dithiocarbamate molybdenum, 60kg of calcium carbonate;

[0059] Antioxidant: 3,5-di-tert-butyl-4-hydroxytoluene 15kg, octylbutyl diphenylamine 10kg;

[0060] Rust inhibitor: 7 kg of thiadiazole derivative.

[0061] This embodiment also provides a method for preparing the above grease composition, which is as follows:

[0062] The base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid are mixed, the temperature is raised to 88°C, and a lithium hydroxide solution accounting for 40% of the total amount of lithium hydroxide is added to start the reaction, and the reaction time is 50 minutes; the temperature is controlled at 96°C, the dibasic acid is added, and after stirring for 40 minutes, the temperature is 95°C, and the remaining lithium hydroxide solution is added dropwise; after the reaction is completed, the mixture is heated to 135°C with stirring and kept at a constant temperature for 40 minutes; the mixture is heated to 201°C, and the base oil accounting for 1 / 3 of the total amount of base oil is added to cool down, the temperature is reduced to 179°C, and the amide is added after the temperature is maintained at a constant temperature for 20 minutes; the temperature is reduced to 145°C, all antioxidants and the remaining base oil are added, the temperature is reduced to 120°C, and a 21MPa high-pressure homogenizer is used for dispersion treatment, the temperature is reduced to 78°C, extreme pressure anti-wear agent, tackifier, antioxidant and rust inhibitor are added, and after stirring evenly, a 0.8mm orifice plate and a 0.5mm orifice plate are used for shear treatment for 120 minutes, and the finished product is canned after filtration and degassing.

[0063] Example 4

[0064] Thickener: 200 kg, composed of 12-hydroxystearic acid, sebacic acid and lithium hydroxide, wherein the mass ratio of 12-hydroxystearic acid to sebacic acid is 4:1; lithium hydroxide: 30 kg;

[0065] Base oil: 1800kg (PAO synthetic oil: 45%, 150BS: 55%, base oil kinematic viscosity at 40°C: 226mm2 / s);

[0066] Tackifier: EPDM rubber 90kg;

[0067] Amide: Ethylene bisoleamide 120kg;

[0068] Extreme pressure anti-wear agent: 20kg dialkyl dithiocarbamate, 30kg dialkyl dithiocarbamate molybdenum and 30kg dialkyl dithiophosphate zinc;

[0069] Antioxidant: 3,5-di-tert-butyl-4-hydroxytoluene 15kg, octylbutyl diphenylamine 15kg;

[0070] Rust inhibitor: 10 kg of thiadiazole derivative.

[0071] This embodiment also provides a method for preparing the above grease composition, which is as follows:

[0072] The base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid are mixed, the temperature is raised to 85°C, and a lithium hydroxide solution accounting for 45% of the total amount of lithium hydroxide is added to start the reaction, and the reaction time is 50 minutes; the temperature is controlled at 96°C, the dibasic acid is added, and after stirring for 45 minutes, the remaining lithium hydroxide solution is added dropwise at a temperature of 98°C; after the reaction is completed, the mixture is stirred and heated to 136°C and kept at a constant temperature for 35 minutes; the mixture is continued to be heated to 202°C, and the base oil accounting for 1 / 3 of the total amount of base oil is added to cool down, the temperature is reduced to 184°C, and the amide is added after the temperature is maintained at a constant temperature for 20 minutes; the temperature is reduced to 144°C, all antioxidants and the remaining base oil are added, the temperature is reduced to 118°C, and a 22MPa high-pressure homogenizer is used for dispersion treatment, the temperature is reduced to 76°C, extreme pressure anti-wear agent, tackifier, antioxidant and rust inhibitor are added, and after stirring evenly, a 0.8mm orifice plate and a 0.5mm orifice plate are used for shear treatment for 120 minutes, and the finished product is canned after filtration and degassing.

[0073] Example 5

[0074] Thickener: 200 kg, composed of 12-hydroxystearic acid, sebacic acid and lithium hydroxide, wherein the mass ratio of 12-hydroxystearic acid to sebacic acid is 3:1; lithium hydroxide: 30 kg;

[0075] Base oil: 1800kg (PAO synthetic oil: 50%, 150BS: 50%, base oil kinematic viscosity at 40°C: 203mm2 / s);

[0076] Tackifier: EPDM rubber 80kg;

[0077] Amide: bis(hydroxyethyl)ethylene bis(stearic acid)amide 100kg;

[0078] Extreme pressure anti-wear agent: 20kg dialkyl dithiocarbamate, 30kg dialkyl dithiocarbamate molybdenum and 30kg dialkyl dithiophosphate zinc;

[0079] Antioxidant: 3,5-di-tert-butyl-4-hydroxytoluene 15kg, octylbutyl diphenylamine 15kg;

[0080] Rust inhibitor: 10 kg of thiadiazole derivative.

[0081] This embodiment also provides a method for preparing the above grease composition, which is as follows:

[0082] The base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid are mixed, the temperature is raised to 87°C, and a lithium hydroxide solution accounting for 45% of the total amount of lithium hydroxide is added to start the reaction, and the reaction time is 50 minutes; the temperature is controlled at 95°C, the dibasic acid is added, and after stirring for 40 minutes, the remaining lithium hydroxide solution is started to be added dropwise at a temperature of 96°C; after the reaction is completed, the mixture is stirred and heated to 135°C and kept at a constant temperature for 37 minutes; the mixture is continued to be heated to 200°C, and the base oil accounting for 1 / 3 of the total amount of base oil is added to cool down, the temperature is reduced to 178°C, and the amide is added after the temperature is maintained at a constant temperature for 25 minutes; the temperature is reduced to 148°C, all antioxidants and the remaining base oil are added, the temperature is reduced to 115°C, and a 21MPa high-pressure homogenizer is used for dispersion treatment, the temperature is reduced to 77°C, extreme pressure anti-wear agent, tackifier, antioxidant and rust inhibitor are added, and after stirring evenly, a 0.8mm orifice plate and a 0.5mm orifice plate are used for shear treatment for 120 minutes, and the finished product is canned after filtering and degassing.

[0083] Comparative Example 1

[0084] Thickener: 200 kg, composed of 12-hydroxystearic acid, sebacic acid and lithium hydroxide, wherein the mass ratio of 12-hydroxystearic acid to sebacic acid is 3:1; lithium hydroxide: 30 kg;

[0085] Base oil: 1800kg (PAO synthetic oil: 60%, 150BS: 40%, base oil kinematic viscosity at 40°C: 160mm2 / s);

[0086] Tackifier: EPDM rubber 80kg;

[0087] Extreme pressure anti-wear agent: 30kg dialkyl dithiocarbamate, 40kg molybdenum dialkyl dithiocarbamate;

[0088] Antioxidant: 3,5-di-tert-butyl-4-hydroxytoluene 10kg, octylbutyl diphenylamine 10kg;

[0089] Rust inhibitor: 8 kg of thiadiazole derivative.

[0090] This embodiment also provides a method for preparing the above grease composition, which is as follows:

[0091] The base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid are mixed, the temperature is raised to 80-90°C, and a lithium hydroxide solution accounting for 35% of the total amount of lithium hydroxide is added to start the reaction, and the reaction time is 51 minutes; the temperature is controlled at 95°C, the dibasic acid is added, and after stirring for 37 minutes, the remaining lithium hydroxide solution is added dropwise at a temperature of 96°C; after the reaction is completed, the mixture is stirred and heated to 136°C and kept at a constant temperature for 42 minutes; the mixture is continued to be heated to 203°C, and the base oil accounting for 1 / 3 of the total amount of base oil is added to cool down, the temperature drops to 181°C, and the temperature is kept at a constant temperature for 15 minutes; the temperature drops to 146°C, all antioxidants and the remaining base oil are added, the temperature drops to 118°C, and a 21MPa high-pressure homogenizer is used for dispersion treatment, the temperature drops to 78°C, extreme pressure anti-wear agent, tackifier, antioxidant and rust inhibitor are added, and after stirring evenly, a 0.8mm orifice plate and a 0.5mm orifice plate are used for shear treatment for 120 minutes, and the finished product is canned after filtration and degassing.

[0092] Thickener: 200 kg, composed of 12-hydroxystearic acid, sebacic acid and lithium hydroxide, wherein the mass ratio of 12-hydroxystearic acid to sebacic acid is 3:1; lithium hydroxide: 30 kg;

[0093] Base oil: 1800kg (PAO synthetic oil: 50%, 150BS: 50%, base oil kinematic viscosity at 40°C: 203mm2 / s);

[0094] Amide: bis(hydroxyethyl)ethylene bis(stearic acid)amide 100kg;

[0095] Extreme pressure anti-wear agent: 20kg dialkyl dithiocarbamate, 30kg dialkyl dithiocarbamate molybdenum and 30kg dialkyl dithiophosphate zinc;

[0096] Antioxidant: 3,5-di-tert-butyl-4-hydroxytoluene 15kg, octylbutyl diphenylamine 15kg;

[0097] Rust inhibitor: 10 kg of thiadiazole derivative.

[0098] This embodiment also provides a method for preparing the above grease composition, which is as follows:

[0099] The base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid are mixed, the temperature is raised to 88°C, and a lithium hydroxide solution accounting for 45% of the total amount of lithium hydroxide is added to start the reaction, and the reaction time is 52 minutes; the temperature is controlled at 96°C, the dibasic acid is added, and after stirring for 43 minutes, the remaining lithium hydroxide solution is added dropwise at a temperature of 95°C; after the reaction is completed, the mixture is stirred and heated to 136°C and kept at a constant temperature for 39 minutes; the mixture is continued to be heated to 202°C, and the base oil accounting for 1 / 3 of the total amount of base oil is added to cool down, the temperature is reduced to 180°C, and the amide is added after the temperature is maintained at a constant temperature for 20 minutes; the temperature is reduced to 144°C, all antioxidants and the remaining base oil are added, the temperature is reduced to 117°C, and a 21MPa high-pressure homogenizer is used for dispersion treatment, the temperature is reduced to 79°C, extreme pressure anti-wear agent, antioxidant and rust inhibitor are added, and after stirring evenly, a 0.8mm orifice plate and a 0.5mm orifice plate are used for shear treatment for 120 minutes, and the finished product is canned after filtration and degassing.

[0100] Thickener: 200 kg, composed of 12-hydroxystearic acid, sebacic acid and lithium hydroxide, wherein the mass ratio of 12-hydroxystearic acid to sebacic acid is 3:1; lithium hydroxide: 30 kg;

[0101] Base oil: 1800kg (PAO synthetic oil: 60%, 150BS: 40%, base oil kinematic viscosity at 40°C: 160mm2 / s);

[0102] Tackifier: EPDM rubber 80kg;

[0103] Extreme pressure anti-wear agent: 30kg dialkyl dithiocarbamate, 40kg molybdenum dialkyl dithiocarbamate;

[0104] Antioxidant: 3,5-di-tert-butyl-4-hydroxytoluene 10kg, octylbutyl diphenylamine 10kg;

[0105] Rust inhibitor: 8 kg of thiadiazole derivative.

[0106] This embodiment also provides a method for preparing the above grease composition, which is as follows:

[0107] The base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid are mixed, the temperature is raised to 80-90°C, and a lithium hydroxide solution accounting for 35% of the total amount of lithium hydroxide is added to start the reaction, and the reaction time is 51 minutes; the temperature is controlled at 95°C, the dibasic acid is added, and after stirring for 37 minutes, the remaining lithium hydroxide solution is added dropwise at a temperature of 96°C; after the reaction is completed, the mixture is stirred and heated to 136°C and kept at a constant temperature for 42 minutes; the mixture is continued to be heated to 203°C, and the base oil accounting for 1 / 3 of the total amount of base oil is added to cool down, the temperature drops to 181°C, and the temperature is kept at a constant temperature for 15 minutes; the temperature drops to 146°C, all antioxidants and the remaining base oil are added, the temperature drops to 118°C, and a 21MPa high-pressure homogenizer is used for dispersion treatment, the temperature drops to 78°C, extreme pressure anti-wear agent, tackifier, antioxidant and rust inhibitor are added, and after stirring evenly, a 0.8mm orifice plate and a 0.5mm orifice plate are used for shear treatment for 120 minutes, and the finished product is canned after filtration and degassing.

[0108] Comparative Example 2

[0109] Thickener: 200 kg, composed of 12-hydroxystearic acid, sebacic acid and lithium hydroxide, wherein the mass ratio of 12-hydroxystearic acid to sebacic acid is 3:1; lithium hydroxide: 30 kg;

[0110] Base oil: 1800kg (PAO synthetic oil: 50%, 150BS: 50%, base oil kinematic viscosity at 40°C: 203mm2 / s);

[0111] Amide: bis(hydroxyethyl)ethylene bis(stearic acid)amide 100kg;

[0112] Extreme pressure anti-wear agent: 20kg dialkyl dithiocarbamate, 30kg dialkyl dithiocarbamate molybdenum and 30kg dialkyl dithiophosphate zinc;

[0113] Antioxidant: 3,5-di-tert-butyl-4-hydroxytoluene 15kg, octylbutyl diphenylamine 15kg;

[0114] Rust inhibitor: 10 kg of thiadiazole derivative.

[0115] This embodiment also provides a method for preparing the above grease composition, which is as follows:

[0116] The base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid are mixed, the temperature is raised to 88°C, and a lithium hydroxide solution accounting for 45% of the total amount of lithium hydroxide is added to start the reaction, and the reaction time is 52 minutes; the temperature is controlled at 96°C, the dibasic acid is added, and after stirring for 43 minutes, the remaining lithium hydroxide solution is added dropwise at a temperature of 95°C; after the reaction is completed, the mixture is stirred and heated to 136°C and kept at a constant temperature for 39 minutes; the mixture is continued to be heated to 202°C, and the base oil accounting for 1 / 3 of the total amount of base oil is added to cool down, the temperature is reduced to 180°C, and the amide is added after the temperature is maintained at a constant temperature for 20 minutes; the temperature is reduced to 144°C, all antioxidants and the remaining base oil are added, the temperature is reduced to 117°C, and a 21MPa high-pressure homogenizer is used for dispersion treatment, the temperature is reduced to 79°C, extreme pressure anti-wear agent, antioxidant and rust inhibitor are added, and after stirring evenly, a 0.8mm orifice plate and a 0.5mm orifice plate are used for shear treatment for 120 minutes, and the finished product is canned after filtration and degassing.

[0117] Table 1 shows the results of performance tests on the greases obtained in Examples 1 to 5 and Comparative Examples 1 to 2.

[0118] Table 1 Grease performance test results

[0119]

[0120] It can be seen from the data in Table 1 that the greases prepared in Examples 1-5 of the present invention all exhibit excellent water resistance, cold rolling liquid resistance, adhesion performance, good shear resistance and rubber compatibility, and fully meet the harsh working conditions of the rolling mill sealed bearing under cold rolling liquid conditions. The present invention can provide more reliable and comprehensive protection for the equipment in use, and has a good application prospect.

[0121] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A rolling mill sealed bearing grease, characterized in that: Prepared by the following preparation method: Mix the base oil accounting for 1 / 3 of the total amount of base oil and the whole amount of 12-hydroxystearic acid, raise the temperature to 80-90°C, add lithium hydroxide solution accounting for 30-50% of the total amount of lithium hydroxide to start the reaction, and the reaction time is 45-60 minutes; control the temperature at 90-100°C to add the dibasic acid, stir for 30-50 minutes, and then start to drop the remaining lithium hydroxide solution at 95-100°C; after the reaction is completed, stir and heat to 130-140°C, keep the temperature constant for 30-45 minutes; continue to heat to 190-205 ℃, add base oil accounting for 1 / 3 of the total base oil amount, cool down the temperature to 160-190℃, keep constant temperature for 15-30min, then add amide; when the temperature drops to 140-150℃, add all antioxidants and remaining base oil, drop the temperature to 100-120℃, use 18-22MPa high-pressure homogenizer for dispersion treatment, drop the temperature to below 80℃, add extreme pressure anti-wear agent, tackifier, rust inhibitor, stir evenly, and then use 0.8mm orifice plate and 0.5mm orifice plate for shear treatment for 120min, filter and degas, and can the finished product.

2. The rolling mill sealed bearing grease according to claim 1, characterized in that: The thickener is prepared by reacting 12-hydroxystearic acid, a dibasic acid and lithium hydroxide, wherein the dibasic acid can be one or both of azelaic acid and sebacic acid.

3. The rolling mill sealed bearing grease according to claim 1, characterized in that: The base oil has a kinematic viscosity of 100-300 mm at 40°C. 2 / s.

4. The rolling mill sealed bearing grease according to claim 1, characterized in that: The tackifier is one or two selected from EPDM rubber or EPDM rubber.

5. The rolling mill sealed bearing grease according to claim 1, characterized in that: The amide is one or two selected from acrylamide, polyacrylamide, stearic acid amide propyl dimethylamine, ethylene bisoleamide, and bishydroxyethyl ethylene bisstearamide; the mass ratio of the amide to the base oil is (0.01-0.1):

1.

6. The rolling mill sealed bearing grease according to claim 1, characterized in that: The extreme pressure anti-wear agent is at least one selected from dialkyl dithiocarbamate, dialkyl dithiocarbamate molybdenum, calcium carbonate and dialkyl dithiophosphate zinc.

7. The rolling mill sealed bearing grease according to claim 1, characterized in that: The antioxidant is a mixture of 3,5-di-tert-butyl-4-hydroxytoluene and octylbutyldiphenylamine.

8. The rolling mill sealed bearing grease according to claim 1, characterized in that: The rust inhibitor is a thiadiazole derivative.

9. Use of the rolling mill sealed bearing grease as claimed in claim 1 in a rolling mill sealed bearing.

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