A bearing grinding fluid and its preparation method and application

Abstract

The invention discloses a bearing grinding fluid and a preparation method thereof, and belongs to the technical field of grinding fluid. The grinding fluid includes the following components in parts by weight: 10-15 parts of pH regulator, 5-10 parts of rust inhibitor, 0.1-2 parts of corrosion inhibitor, 10-20 parts of deionized water, 30-40 parts of base oil, 10-20 parts of lubricant, 5-10 parts of emulsifier, 2-5 parts of bactericide, 0.1-0.2 parts of defoamer; the lubricant is at least one of diisodecyl azelate, diisotridecyl adipate, mixed dibasic acid diisooctyl ester, and 2-ethylhexyl oleate. The present invention selects a specific lubricant and other components to interact, which can significantly reduce the friction coefficient of the bearing grinding fluid and improve the friction efficiency; reduce the wear spot diameter and improve the surface finish of the workpiece; the resulting bearing grinding fluid has excellent lubrication performance, rust prevention performance, wear resistance, and defoaming performance; no other solvents are needed, and it can be used directly after dilution and can meet the requirements of high-speed grinding of bearings.

Description

Technical Field

[0001] The invention relates to the field of grinding fluid, and in particular to a bearing grinding fluid and a preparation method and application thereof. Background Art

[0002] Bearings are the core basic parts of industry. Grinding fluid is used in the grinding process of bearings. Grinding fluid can not only wash away the debris generated during grinding, but also cool down the grinding part. It plays a very important role in the grinding process, so the quality of grinding fluid directly affects the grinding effect. Due to the high grinding speed of high-speed grinding, when ordinary grinding fluid is used for bearing grinding, there are problems such as large grinding force, deep bearing scratches, low grinding efficiency, and unsatisfactory finished product precision and quality. At present, in order to improve the lubricity of grinding fluid, there are mainly two methods: one is to use oleic acid, tall oil and other fatty acids containing carboxyl groups as the main lubricant, but a large amount of foam is easily generated during the bearing grinding process, resulting in excessive grinding temperature, burns on the workpiece surface, and deep scratches on the workpiece; the other is to use polyethylene glycol, polyether, self-emulsifying fat, etc. as lubricants. Compared with fatty acid lubricants containing carboxyl groups, these lubricants have relatively low foam, but their polarity is weak and their lubrication performance is insufficient. They can only meet the rough grinding and lubrication requirements of medium and small bearings. When grinding large and precision bearings, problems such as poor surface finish and insufficient precision occur. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a bearing grinding fluid and a preparation method and application thereof; the grinding fluid has excellent lubrication, rust prevention, wear resistance and defoaming properties, does not need to be matched with other solvents, can be used directly after dilution and can meet the requirements of high-speed grinding of bearings.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a bearing grinding fluid, comprising the following components in parts by weight: 10-15 parts of pH regulator, 5-10 parts of rust inhibitor, 0.1-2 parts of corrosion inhibitor, 10-20 parts of deionized water, 30-40 parts of base oil, 10-20 parts of lubricant, 5-10 parts of emulsifier, 2-5 parts of bactericide, and 0.1-0.2 parts of defoaming agent; the lubricant is at least one of diisodecyl azelate, diisotridecyl adipate, diisooctyl mixed dibasic acid, and 2-ethylhexyl oleate.

[0005] The bearing grinding fluid of the present invention has excellent lubrication, rust prevention, wear resistance and defoaming performance; it does not need to be matched with other solvents, can be used directly after dilution and can meet the requirements of high-speed grinding of bearings. Selecting a specific lubricant as a component of the bearing grinding fluid and interacting with other components can significantly reduce the friction coefficient of the bearing grinding fluid and improve the friction efficiency; reduce the wear spot diameter and improve the surface finish of the workpiece.

[0006] As a preferred embodiment of the bearing grinding fluid described in the present invention, the emulsifier is at least one of tallow amine polyoxyethylene ether, oleyl alcohol polyoxyethylene ether, isotridecanol polyoxyethylene ether, C12-16 alcohol polyoxyethylene ether, and castor oil polyoxyethylene ether.

[0007] As a preferred embodiment of the bearing grinding fluid described in the present invention, the emulsifier is at least two of tallow amine polyoxyethylene ether, oleyl alcohol polyoxyethylene ether, isotridecanol polyoxyethylene ether, C12-16 alcohol polyoxyethylene ether, and castor oil polyoxyethylene ether, and the emulsifier includes tallow amine polyoxyethylene ether.

[0008] The above-mentioned emulsifier is selected because, on the one hand, the above-mentioned emulsifier and other components cooperate with each other to significantly reduce the surface tension of the bearing grinding fluid. During the grinding process, the grinding fluid can effectively penetrate into the grinding area of ​​the grinding wheel and the workpiece, and play a good lubrication and cooling effect; on the other hand, the above-mentioned emulsifier and lubricant work together to take away the metal chips and grinding wheel powder generated during the grinding process, thereby playing a cleaning role and reducing the roughness of the workpiece surface.

[0009] In addition, the inventors have found through research that the bearing grinding fluid obtained by compounding tallow amine polyoxyethylene ether with at least one of the remaining emulsifiers mentioned above has better lubrication and anti-wear properties.

[0010] As a preferred embodiment of the bearing grinding fluid described in the present invention, the pH regulator is at least one of N-[3-(dimethylamino)propyl]-N,N',N"-trimethylpropane-1,3-diamine, 1-(bis(3-(dimethylamino)propyl)amino)-2-propanol, and 3-butoxypropylamine.

[0011] As a preferred embodiment of the bearing grinding fluid described in the present invention, the rust inhibitor is at least one of oleoyl hydroxyethyl imidazoline, tolyl (sulfo) aminocaproic acid, 6-[(octanoyl) amino]caproic acid, and dodecanedioic acid.

[0012] The oleoyl hydroxyethyl imidazoline of the present invention is purchased from Croda with the brand name Croda Zoline O.

[0013] In the present invention, the pH adjuster can adjust the pH of the grinding fluid on the one hand, and on the other hand, the pH adjuster contains an amine group, which has a strong affinity for metals, can effectively increase the adhesion between the rust inhibitor and the metal surface, and improve the adaptability of the rust inhibitor, thereby improving the rust prevention performance of the grinding fluid.

[0014] As a preferred embodiment of the bearing grinding fluid of the present invention, the corrosion inhibitor is benzotriazole and / or a benzotriazole derivative. Optionally, the benzotriazole derivative includes methylbenzotriazole.

[0015] As a preferred embodiment of the bearing grinding fluid described in the present invention, the bactericide is at least one of n-butyl-1,2-benzisothiazolin-3-one, 1,2-benzisothiazolin-3-one, and iodopropynyl butylcarbamate.

[0016] As a preferred embodiment of the bearing grinding fluid of the present invention, the base oil is a hydrogenated cycloalkyl base oil, and the kinematic viscosity of the base oil is 20 to 25 (40°C) / mm 2 ·s -1 .

[0017] As a preferred embodiment of the bearing grinding fluid described in the present invention, the defoaming agent is a modified silane defoaming agent.

[0018] Another object of the present invention is to provide a method for preparing the bearing grinding fluid, comprising the following steps: after evenly mixing the pH adjuster, rust inhibitor, corrosion inhibitor, and deionized water, adding base oil, lubricant, emulsifier, bactericide, and defoamer in sequence, and mixing evenly to obtain the bearing grinding fluid.

[0019] Preferably, in order to further improve the dispersibility of the pH adjuster, rust inhibitor and corrosion inhibitor, the temperature of mixing the pH adjuster, rust inhibitor, corrosion inhibitor and deionized water is 50-60°C.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The bearing grinding fluid of the present invention has excellent lubrication, rust prevention, wear resistance and defoaming performance; it does not need to be matched with other solvents, can be used directly after dilution and can meet the requirements of high-speed grinding of bearings; the surface finish of the workpiece is high and the service life of the grinding wheel is long;

[0022] 2. Good cooling performance, able to quickly reduce the temperature of processed parts;

[0023] 3. It has good cleaning and flushing properties for the grinding chips on the surface of the processed parts, thus improving the grinding efficiency;

[0024] 4. Good storage stability and long service life;

[0025] 5. The preparation method is simple and can be industrially mass-produced. DETAILED DESCRIPTION

[0026] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments and comparative examples, the purpose of which is to understand the content of the present invention in detail, rather than to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative work premise belong to the protection scope of the present invention. The experimental reagents and instruments involved in the implementation of the present invention, unless otherwise specified, are all commonly used common reagents and instruments.

[0027] The defoamers used in the following examples and comparative examples are all the same defoamers, which are all modified silane defoamers.

[0028] In the following examples and comparative examples, parts are by weight.

[0029] Example 1

[0030] This embodiment provides a method for preparing a bearing grinding fluid, comprising the following steps:

[0031] First, 5 parts of N-[3-(dimethylamino)propyl]-N,N',N"-trimethylpropane-1,3-diamine, 5 parts of 1-(bis(3-(dimethylamino)propyl)amino)-2-propanol, 3 parts of oleylhydroxyethylimidazoline, 3 parts of tolyl(sulfo)aminocaproic acid, 0.5 parts of benzotriazole, and 20 parts of deionized water were mixed and stirred at 55°C for 45 minutes to obtain a mixture;

[0032] Then, 40 parts of hydrogenated cycloalkyl base oil, 10 parts of diisodecyl azelate, 10 parts of diisotridecyl adipate, 3 parts of tallow amine polyoxyethylene ether, 3 parts of oleyl alcohol polyoxyethylene ether, 3 parts of n-butyl-1,2-benzisothiazolin-3-one, and 0.1 parts of defoamer were added to the mixture in sequence, and the mixture was stirred at room temperature for 45 minutes to obtain a bearing grinding fluid; wherein the kinematic viscosity of the hydrogenated cycloalkyl base oil is 20 (40°C) / mm 2 ·s -1 .

[0033] Example 2

[0034] This embodiment provides a method for preparing a bearing grinding fluid, comprising the following steps:

[0035] First, 10 parts of N-[3-(dimethylamino)propyl]-N,N',N"-trimethylpropane-1,3-diamine, 6 parts of oleylhydroxyethylimidazoline, 0.5 parts of benzotriazole, and 20 parts of deionized water were mixed and stirred at 50°C for 60 minutes to obtain a mixture;

[0036] Then, 40 parts of hydrogenated cycloalkyl base oil, 20 parts of diisodecyl azelate, 3 parts of tallow amine polyoxyethylene ether, 3 parts of isotridecyl alcohol polyoxyethylene ether, 3 parts of n-butyl-1,2-benzisothiazolin-3-one, and 0.1 parts of defoamer were added to the mixture in sequence, and stirred at room temperature for 30 minutes to obtain a bearing grinding fluid; wherein the kinematic viscosity of the hydrogenated cycloalkyl base oil is 25 (40°C) / mm 2 ·s -1 .

[0037] Example 3

[0038] This embodiment provides a method for preparing a bearing grinding fluid, comprising the following steps:

[0039] First, 10 parts of 1-(bis(3-(dimethylamino)propyl)amino)-2-propanol, 3 parts of tolyl(sulfo)aminocaproic acid, 3 parts of 6-[(octanoyl)amino]caproic acid, 0.5 parts of methylbenzotriazole, and 20 parts of deionized water were mixed and stirred at 60° C. for 30 minutes to obtain a mixture;

[0040] Then, 40 parts of hydrogenated cycloalkyl base oil, 10 parts of mixed dibasic acid dioctyl ester, 10 parts of 2-ethylhexyl oleate, 3 parts of tallow amine polyoxyethylene ether, 3 parts of castor oil polyoxyethylene ether, 3 parts of n-butyl-1,2-benzisothiazolin-3-one, and 0.1 parts of defoamer were added to the mixture in sequence, and stirred at room temperature for 60 minutes to obtain a bearing grinding fluid; wherein the kinematic viscosity of the hydrogenated cycloalkyl base oil is 22 (40°C) / mm 2 ·s -1 .

[0041] Example 4

[0042] This embodiment provides a method for preparing a bearing grinding fluid, comprising the following steps:

[0043] First, 5 parts of 1-(bis(3-(dimethylamino)propyl)amino)-2-propanol, 5 parts of 3-butoxypropylamine, 3 parts of tolyl(sulfo)aminocaproic acid, 3 parts of 6-[(octanoyl)amino]caproic acid, 0.5 parts of tolyltriazole, and 20 parts of deionized water were mixed and stirred at 55° C. for 45 minutes to obtain a mixture;

[0044] Then, 40 parts of hydrogenated cycloalkyl base oil, 10 parts of diisodecyl azelate, 10 parts of 2-ethylhexyl oleate, 3 parts of tallow amine polyoxyethylene ether, 3 parts of C12-C16 alcohol polyoxyethylene ether, 3 parts of n-butyl-1,2-benzisothiazolin-3-one, and 0.1 parts of defoamer were added to the mixture in sequence, and stirred at room temperature for 45 minutes to obtain a bearing grinding fluid; wherein the kinematic viscosity of the hydrogenated cycloalkyl base oil is 20 (40°C) / mm 2 ·s -1 .

[0045] Example 5

[0046] This embodiment provides a method for preparing a bearing grinding fluid, comprising the following steps:

[0047] First, 10 parts of N-[3-(dimethylamino)propyl]-N,N',N"-trimethylpropane-1,3-diamine, 5 parts of 1-(bis(3-(dimethylamino)propyl)amino)-2-propanol, 2 parts of oleylhydroxyethylimidazoline, 3 parts of tolyl(sulfo)aminocaproic acid, 0.1 parts of benzotriazole, and 10 parts of deionized water were mixed and stirred at 55°C for 45 minutes to obtain a mixture;

[0048] Then, 30 parts of hydrogenated cycloalkyl base oil, 5 parts of diisodecyl azelate, 5 parts of diisotridecyl adipate, 3 parts of tallow amine polyoxyethylene ether, 2 parts of oleyl alcohol polyoxyethylene ether, 2 parts of n-butyl-1,2-benzisothiazolin-3-one, and 0.1 parts of defoamer were added to the mixture in sequence, and the mixture was stirred at room temperature for 45 minutes to obtain a bearing grinding fluid; wherein the kinematic viscosity of the hydrogenated cycloalkyl base oil is 20 (40°C) / mm 2 ·s -1 .

[0049] Example 6

[0050] This embodiment provides a method for preparing a bearing grinding fluid, comprising the following steps:

[0051] First, 8 parts of N-[3-(dimethylamino)propyl]-N,N',N"-trimethylpropane-1,3-diamine, 5 parts of 1-(bis(3-(dimethylamino)propyl)amino)-2-propanol, 5 parts of oleylhydroxyethylimidazoline, 5 parts of tolyl(sulfo)aminocaproic acid, 2 parts of benzotriazole, and 20 parts of deionized water were mixed and stirred at 55°C for 45 minutes to obtain a mixture;

[0052] Then, 35 parts of hydrogenated cycloalkyl base oil, 10 parts of diisodecyl azelate, 5 parts of diisotridecyl adipate, 7 parts of tallow amine polyoxyethylene ether, 3 parts of oleyl alcohol polyoxyethylene ether, 5 parts of n-butyl-1,2-benzisothiazolin-3-one, and 0.2 parts of defoamer were added to the mixture in sequence, and stirred at room temperature for 45 minutes to obtain a bearing grinding fluid; wherein the kinematic viscosity of the hydrogenated cycloalkyl base oil is 20 (40°C) / mm 2 ·s -1 .

[0053] Comparative Example 1

[0054] This comparative example provides a method for preparing a bearing grinding fluid, comprising the following steps:

[0055] First, 5 parts of monoethanolamine, 5 parts of triethanolamine, 3 parts of boric acid, 3 parts of sebacic acid, 0.5 parts of benzotriazole, and 20 parts of deionized water were mixed and stirred at 55° C. for 45 minutes to obtain a mixture;

[0056] Then, 50 parts of hydrogenated cycloalkyl base oil, 5 parts of tall oil, 10 parts of trimethylolpropane oleate, 3 parts of AEO9 lubricant, 3 parts of Span-80 emulsifier, 3 parts of n-butyl-1,2-benzisothiazolin-3-one, and 0.1 parts of defoamer were added to the mixture in sequence; the bearing grinding fluid was obtained by stirring at room temperature for 45 minutes; the kinematic viscosity of the hydrogenated cycloalkyl base oil was 20 (40°C) / mm 2 ·s -1 .

[0057] Comparative Example 2

[0058] This comparative example provides a method for preparing a bearing grinding fluid. The only difference between this comparative example and Example 1 is that 20 parts of hydrogenated cycloalkyl base oil are used to replace 10 parts of diisodecyl azelate and 10 parts of diisotridecyl adipate; that is, this comparative example does not contain a lubricant.

[0059] Comparative Example 3

[0060] This comparative example provides a method for preparing a bearing grinding fluid. The difference between this comparative example and Example 1 is that 3 parts of AEO9 lubricant and 3 parts of Span-80 emulsifier are used to replace 3 parts of tallow amine polyoxyethylene ether.

[0061] And 3 parts of oleyl alcohol polyoxyethylene ether; that is, the emulsifier in this comparative example is 3 parts of AEO9 and 3 parts of Span-80.

[0062] Comparative Example 4

[0063] This embodiment provides a method for preparing a bearing grinding fluid, comprising the following steps:

[0064] First, 5 parts of monoethanolamine, 5 parts of triethanolamine, 3 parts of boric acid, 3 parts of sebacic acid, 0.5 parts of benzotriazole, and 20 parts of deionized water were mixed and stirred at 55° C. for 45 minutes to obtain a mixture;

[0065] Then, 40 parts of hydrogenated cycloalkyl base oil, 10 parts of diisodecyl azelate, 10 parts of diisotridecyl adipate, 3 parts of tallow amine polyoxyethylene ether, 3 parts of oleyl alcohol polyoxyethylene ether, 3 parts of n-butyl-1,2-benzisothiazolin-3-one, and 0.1 parts of defoamer were added to the mixture in sequence, and the mixture was stirred at room temperature for 45 minutes to obtain a bearing grinding fluid; wherein the kinematic viscosity of the hydrogenated cycloalkyl base oil is 20 (40°C) / mm 2 ·s -1 .

[0066] Comparative Example 5

[0067] This comparative example provides a method for preparing a bearing grinding fluid. The difference between this comparative example and Example 1 is that the lubricant in this comparative example is 10 parts of tall oil and 10 parts of trimethylolpropane oleate.

[0068] Comparative Example 6

[0069] This comparative example provides a method for preparing a bearing grinding fluid. The difference between this comparative example and Example 1 is that the pH regulator in this comparative example is 10 parts of triethanolamine.

[0070] Performance Test:

[0071] The bearing grinding fluids prepared in the embodiments and comparative examples were diluted with deionized water to a dilution with a mass fraction of 5%, and then the performance was tested. The test methods and results are shown in Table 1 below.

[0072] Table 1

[0073]

[0074]

[0075] It can be seen from the experimental data in Table 1 that the bearing grinding fluid prepared in the embodiments of the present invention has excellent lubrication performance, rust prevention performance, wear resistance, defoaming performance and low surface tension; the wear spot diameter of the embodiments is less than 0.65 mm, and the friction coefficient is less than 0.115.

[0076] Comparative Example 1 is a traditional formula for bearing grinding fluid. From the experimental data of Comparative Example 1, Comparative Example 2, Comparative Example 5 and Example 1, it can be seen that the lubricant of the present invention can cooperate with other components to significantly reduce the friction coefficient of the bearing grinding fluid, reduce the wear spot diameter, and improve the surface finish of the workpiece.

[0077] It can be seen from the experimental data of Example 1, Comparative Example 1, Comparative Example 4 and Comparative Example 6 that the pH regulator and the rust inhibitor of the present invention cooperate with each other to effectively prevent the bearing from rusting during the grinding process, thereby improving the quality of the bearing and the grinding efficiency.

[0078] It can be seen from the test data of Example 1 and Comparative Example 3 that the emulsifier of the present invention can significantly reduce the surface tension of the bearing grinding fluid, improve the defoaming performance of the bearing grinding fluid, and further, can also improve the anti-wear performance of the bearing grinding fluid.

[0079] Finally, it should be noted that the above embodiments are used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A bearing grinding fluid, characterized in that: The invention comprises the following components in parts by weight: 10-15 parts of pH regulator, 5-10 parts of rust inhibitor, 0.1-2 parts of corrosion inhibitor, 10-20 parts of deionized water, 30-40 parts of base oil, 10-20 parts of lubricant, 5-10 parts of emulsifier, 2-5 parts of bactericide, and 0.1-0.2 parts of defoamer; the lubricant is at least one of diisodecyl azelate, diisotridecyl adipate, diisooctyl mixed dibasic acid, and 2-ethylhexyl oleate; The emulsifier is at least two of tallow amine polyoxyethylene ether, oleyl alcohol polyoxyethylene ether, isotridecanol polyoxyethylene ether, C12-16 alcohol polyoxyethylene ether, and castor oil polyoxyethylene ether, and the emulsifier includes tallow amine polyoxyethylene ether; The pH regulator is at least one of N-[3-(dimethylamino)propyl]-N,N',N"-trimethylpropane-1,3-propylenediamine, 1-(bis(3-(dimethylamino)propyl)amino)-2-propanol, and 3-butoxypropylamine; The base oil is a hydrogenated cycloalkane base oil, and the kinematic viscosity of the base oil is 20 to 25 (40° C.) / mm 2 ·s -1 .

2. The bearing grinding fluid according to claim 1, characterized in that: The rust inhibitor is at least one of oleyl hydroxyethyl imidazoline, tolyl (sulfo) aminocaproic acid, 6-[(octanoyl) amino]caproic acid, and dodecanedioic acid.

3. The bearing grinding fluid according to claim 1, characterized in that: The corrosion inhibitor is benzotriazole and / or a benzotriazole derivative.

4. The bearing grinding fluid according to claim 1, characterized in that: The bactericide is at least one of n-butyl-1,2-benzisothiazolin-3-one, 1,2-benzisothiazolin-3-one and iodopropynyl butyl carbamate.

5. The bearing grinding fluid according to claim 1, characterized in that: The defoamer is a modified silane defoamer.

6. A method for preparing a bearing grinding fluid according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: evenly mixing a pH regulator, a rust preventer, a corrosion inhibitor and deionized water, sequentially adding base oil, a lubricant, an emulsifier, a bactericide and a defoamer, and evenly stirring to obtain a bearing grinding fluid.

Images