Special oil for metal processing cold saw minimal quantity lubrication and preparation method thereof

Abstract

The invention relates to the technical field of special oil for metal processing, in particular to special oil for metal processing cold saw minimal quantity lubrication and a preparation method thereof. The special oil for metal processing cold saw minimal quantity lubrication comprises the following components in percentage by mass: 23%-28% of palm oil, 70%-75.5% of synthetic ester, 0.1%-1.0% of an antioxidant, 0.3%-0.4% of an antirust agent, 0.1%-0.2% of a defoaming agent and 0.3%-0.4% of a copper corrosion inhibitor, the synthetic ester comprises methyl palmitate and phosphite ester. According to the oil special for metal processing cold saw minimum quantity lubrication, the palm oil, the methyl palmitate and the phosphite ester are matched, the use amount of other components is further optimized, and the oil has the advantages of being good in lubricity, wettability and cooling performance, outstanding in anti-corrosion effect and the like.

Description

Technical Field

[0001] The invention relates to the technical field of special oils for metal processing, in particular to a special minimal lubrication oil for metal processing cold saws and a preparation method thereof. Background Art

[0002] In the cold sawing process, the heat generated by the saw blade when sawing the workpiece is transferred to the sawdust through the saw teeth, so that the sawed workpiece and the saw blade remain at a low temperature.

[0003] Since cold sawing has the characteristics of extremely fast sawing speed, high sawing precision, and extremely strict surface quality requirements, special processing oil is required in cold sawing. Conventional metal processing oil cannot be applied to metal cold sawing due to many limitations such as insufficient lubrication, poor wettability, and slow thermal conductivity. In order to solve the above problems, the processing oil used in metal cold sawing needs to have the following characteristics: (1) good lubricity to ensure good lubricity during metal processing; (2) good wettability to ensure the long-term sharpness of the saw blade and extend its service life; (3) excellent cooling performance to promptly conduct or absorb the heat generated during processing; (4) outstanding anti-rust performance to form a dense protective layer on the surface of ferrous metal processing to avoid rust and ensure its long-term effectiveness.

[0004] Currently commonly used metal processing oils mainly include deep hole drilling oil, cutting oil and trace lubricating oil, etc., but their processing characteristics and performance cannot meet the processing needs of cold saws.

[0005] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a special minimal lubrication oil for metal processing cold saws and a preparation method thereof, aiming to solve the technical problems of special processing oils for cold saw processing in the prior art.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The first aspect of the present invention provides a special minimal lubrication oil for metal processing cold saws, which comprises the following components, calculated by mass percentage: 23% to 28% palm oil, 70% to 75.5% synthetic ester, 0.1% to 1.0% antioxidant, 0.3% to 0.4% rust inhibitor, 0.1% to 0.2% defoaming agent, and 0.3% to 0.4% copper corrosion inhibitor; the synthetic ester comprises methyl palmitate and phosphite.

[0009] The metal processing cold saw minimal lubrication special oil comprises methyl palmitate and phosphite in a mass ratio of (70-71):3.

[0010] The metal processing cold saw minimal lubrication special oil, wherein the antioxidant includes 2,6-di-tert-butyl-4-methylphenol and N,N-di-sec-butyl-p-phenylenediamine.

[0011] The metal processing cold saw minimal lubrication special oil, wherein the mass ratio of 2,6-di-tert-butyl-4-methylphenol and N,N-di-sec-butyl-p-phenylenediamine is (0.8-1.2):1.

[0012] The metal processing cold saw minimal lubrication special oil, wherein the rust inhibitor includes at least one of super-overbased synthetic calcium sulfonate and sodium sulfonate.

[0013] The metal processing cold saw minimal lubrication special oil, wherein the defoaming agent includes at least one of defoaming agent A868 and a high-efficiency hydrocarbon oil-based defoaming agent.

[0014] The metal processing cold saw minimal lubrication special oil, wherein the copper corrosion inhibitor includes at least one of copper corrosion inhibitor T571 and copper corrosion inhibitor T501.

[0015] The metal processing cold saw minimal lubrication special oil comprises the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer, and 0.3% copper corrosion inhibitor.

[0016] A second aspect of the present invention provides a method for preparing a special lubricating oil for use in preparing the above-mentioned special minimal lubrication oil for metalworking cold saws, comprising the following steps:

[0017] Mix palm oil and synthetic ester and stir until homogeneous and transparent;

[0018] Slowly add antioxidant to the mixed solution and stir until it becomes homogeneous and transparent;

[0019] Add rust inhibitor, defoamer and copper corrosion inhibitor in sequence and stir until uniform to obtain transparent metal processing cold saw minimal lubrication special oil.

[0020] In the method for preparing the special lubricating oil, the temperature is controlled at 50-55° C. when the palm oil and the synthetic ester are mixed.

[0021] Beneficial effects: The present invention provides a special minimal-quantity lubrication oil for metal processing cold saws. The special minimal-quantity lubrication oil for metal processing cold saws aims to address the current situation in which the prior art has insufficient lubricity, wettability, cooling performance and service life. By adopting palm oil, methyl palmitate and phosphite as main components and combining them with other components such as rust inhibitors and antioxidants, the special minimal-quantity lubrication oil for metal processing cold saws has the advantages of good lubricity, good wettability, good cooling performance and outstanding anti-corrosion effect. DETAILED DESCRIPTION

[0022] The present invention provides a special minimal-quantity lubricant for metalworking cold saws and a preparation method thereof. To further clarify the objectives, technical solutions, and effects of the present invention, the present invention is further described in detail with reference to the following examples. It should be understood that the specific examples described herein are intended only to illustrate the present invention and are not intended to limit the present invention.

[0023] The first aspect of the present invention provides a special minimal lubrication oil for metal processing cold saws, which comprises the following components, calculated by mass percentage: 23% to 28% palm oil, 70% to 75.5% synthetic ester, 0.1% to 1.0% antioxidant, 0.3% to 0.4% rust inhibitor, 0.1% to 0.2% defoaming agent, and 0.3% to 0.4% copper corrosion inhibitor; the synthetic ester comprises methyl palmitate and phosphite.

[0024] The metal processing cold saw minimal lubrication special oil of the present invention takes into account the process performance requirements of metal surface processing and addresses the problems of existing processing oils in terms of lubricity, wettability, cooling performance and insufficient service life. The oil is compounded with palm oil, methyl palmitate, phosphite and antioxidants. When used, it can achieve efficient processing, has strong anti-corrosion properties and is safe and reliable.

[0025] Specifically, the present invention uses palm oil as the base oil to provide a medium for the uniform dissolution of different types of additives. At the same time, because of its uniformity and repeatability, the active free radicals formed can easily react with functional groups such as ester groups, hydroxyl groups and amino groups, thereby achieving rust prevention, antioxidant, lubrication and other effects.

[0026] Compared to traditional mineral oils, methyl palmitate and phosphite offer superior properties, such as improved viscosity-temperature characteristics, low-temperature performance, and lubricity. Due to the polarity of the ester group, ester molecules easily adsorb on friction surfaces, forming a boundary oil film. Therefore, ester oils generally offer superior lubricity to mineral oils of the same viscosity, and exhibit excellent anti-wear and anti-scratch (extreme pressure) and friction properties.

[0027] Antioxidants form a protective film on metal surfaces, isolating them from air, moisture, and other environmental factors, thereby reducing metal activity and slowing down oxidation and corrosion. Rust inhibitors, on the other hand, form a passive protective film on metal surfaces, slowing down oxidation and corrosion. Copper corrosion inhibitors adsorb onto metal surfaces to form a thin film, protecting copper and other metals from atmospheric corrosion and harmful media. Defoamers are used to prevent excessive foaming during use.

[0028] Preferably, the mass ratio of the methyl palmitate to the phosphite is (70-71):3.

[0029] Preferably, the antioxidant includes 2,6-di-tert-butyl-4-methylphenol and N,N-di-sec-butyl-p-phenylenediamine.

[0030] Preferably, the mass ratio of the 2,6-di-tert-butyl-4-methylphenol to N,N-di-sec-butyl-p-phenylenediamine is (0.8-1.2):1.

[0031] Preferably, the rust inhibitor includes at least one of super-overbased synthetic calcium sulfonate and sodium sulfonate.

[0032] Preferably, the defoaming agent includes at least one of defoaming agent A868 and a high-efficiency hydrocarbon oil-based defoaming agent.

[0033] Preferably, the copper corrosion inhibitor includes at least one of copper corrosion inhibitor T571 and copper corrosion inhibitor T501.

[0034] A second aspect of the present invention provides a method for preparing a special lubricating oil for use in preparing the above-mentioned special minimal lubrication oil for metalworking cold saws, comprising the following steps:

[0035] Mix palm oil and synthetic ester and stir until homogeneous and transparent;

[0036] Slowly add antioxidant to the mixed solution and stir until it becomes homogeneous and transparent;

[0037] Add rust inhibitor, defoamer and copper corrosion inhibitor in sequence and stir until uniform to obtain transparent metal processing cold saw minimal lubrication special oil.

[0038] Preferably, when the palm oil and the synthetic ester are mixed, the temperature is controlled at 50-55°C.

[0039] The present invention is further described with reference to the following specific examples.

[0040] Example 1

[0041] A special minimal lubrication oil for metal processing cold saws, comprising the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571;

[0042] Among them, the manufacturer of defoamer A868 is Wanqing Chemical Technology Co., Ltd.; the manufacturer of copper corrosion inhibitor T571 is Dongguan Hongli Chemical Technology Co., Ltd.;

[0043] The preparation method of special oil for metal processing cold saw minimal lubrication is as follows:

[0044] Mix palm oil, methyl palmitate and phosphite at a temperature of 50-55°C and stir until the mixture is homogeneous and transparent.

[0045] Slowly add antioxidant to the mixed solution and stir until it becomes homogeneous and transparent;

[0046] Add rust inhibitor, defoamer and copper corrosion inhibitor in sequence and stir until uniform to obtain transparent metal processing cold saw minimal lubrication special oil.

[0047] Example 2

[0048] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 23% palm oil, 72.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0049] Example 3

[0050] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 28% of palm oil, 67.3% of methyl palmitate, 3% of phosphite, 0.5% of 2,6-di-tert-butyl-4-methylphenol, 0.3% of N,N-di-sec-butyl-p-phenylenediamine, 0.3% of super-overbased synthetic calcium sulfonate, 0.1% of defoamer A868, and 0.5% of copper corrosion inhibitor T571.

[0051] Example 4

[0052] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 71.3% methyl palmitate, 2% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0053] Example 5

[0054] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 69.3% methyl palmitate, 4% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0055] Example 6

[0056] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25.2% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.3% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0057] Example 7

[0058] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 24.8% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.7% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0059] Example 8

[0060] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% sodium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0061] Example 9

[0062] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.15% super-overbased synthetic calcium sulfonate, 0.15% sodium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0063] Example 10

[0064] A special minimal lubrication oil for metalworking cold saws, comprising the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T501;

[0065] The copper corrosion inhibitor T501 was purchased from Tianjin Yitaicheng Chemical Technology Co., Ltd.

[0066] Example 11

[0067] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, 0.15% copper corrosion inhibitor T501, and 0.15% copper corrosion inhibitor T571.

[0068] Example 12

[0069] A special minimal lubrication oil for metalworking cold saws, comprising the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% high-efficiency hydrocarbon oil-based defoamer, and 0.3% copper corrosion inhibitor T571;

[0070] The model of the high-efficiency hydrocarbon oil-based defoamer is Advantage AM1424 from Ashland, USA.

[0071] Example 13

[0072] A special minimal lubrication oil for metalworking cold saws, comprising the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.05% defoamer A868, 0.05% high-efficiency hydrocarbon oil-based defoamer, and 0.3% copper corrosion inhibitor T571;

[0073] The model of the high-efficiency hydrocarbon oil-based defoamer is Advantage AM1424 from Ashland, USA.

[0074] Example 14

[0075] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 24.9% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.2% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0076] Comparative Example 1

[0077] A special minimal lubrication oil for metal processing cold saws, comprising the following components by mass percentage:

[0078] Palm oil 98.3%, 2,6-di-tert-butyl-4-methylphenol 0.5%, N,N-di-sec-butyl-p-phenylenediamine 0.3%, super-overbased synthetic calcium sulfonate 0.3%, defoamer A868 0.1%, copper corrosion inhibitor T571 0.3%.

[0079] Comparative Example 2

[0080] A special minimal lubricating oil for metal processing cold saws comprises the following components, calculated by mass percentage: 98.3% of methyl palmitate, 0.5% of 2,6-di-tert-butyl-4-methylphenol, 0.5% of N,N-di-sec-butyl-p-phenylenediamine, 0.3% of super-overbased synthetic calcium sulfonate, 0.1% of defoamer A868, and 0.3% of copper corrosion inhibitor T571.

[0081] Comparative Example 3

[0082] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 49.15% of palm oil, 49.15% of methyl palmitate, 0.5% of 2,6-di-tert-butyl-4-methylphenol, 0.5% of N,N-di-sec-butyl-p-phenylenediamine, 0.3% of super-overbased synthetic calcium sulfonate, 0.1% of defoamer A868, and 0.3% of copper corrosion inhibitor T571.

[0083] Comparative Example 4

[0084] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 73.3% methyl palmitate, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0085] Comparative Example 5

[0086] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 73.3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0087] Comparative Example 6

[0088] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 36.65% methyl palmitate, 36.65% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0089] Comparative Example 7

[0090] A special minimal lubricating oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 1% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0091] Comparative Example 8

[0092] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 1% 2,6-di-tert-butyl-4-methylphenol, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0093] Comparative Example 9

[0094] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 24% palm oil, 70.3% methyl palmitate, 3% phosphite, 1% 2,6-di-tert-butyl-4-methylphenol, 1% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0095] Comparative Example 10

[0096] A special minimal lubricating oil for metal processing cold saws comprises the following components, calculated by mass percentage: 26% of palm oil, 70.3% of methyl palmitate, 3% of phosphite, 0.3% of super-overbased synthetic calcium sulfonate, 0.1% of defoamer A868, and 0.3% of copper corrosion inhibitor T571.

[0097] Comparative Example 11

[0098] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25.3% of palm oil, 70.3% of methyl palmitate, 3% of phosphite, 0.5% of 2,6-di-tert-butyl-4-methylphenol, 0.5% of N,N-di-sec-butyl-p-phenylenediamine, 0.1% of defoamer A868, and 0.3% of copper corrosion inhibitor T571.

[0099] Comparative Example 12

[0100] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 24.8% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.5% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0101] Comparative Example 13

[0102] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 22.3% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0103] Comparative Example 14

[0104] A special minimal lubricating oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25.3% of palm oil, 70.3% of methyl palmitate, 3% of phosphite, 0.5% of 2,6-di-tert-butyl-4-methylphenol, 0.5% of N,N-di-sec-butyl-p-phenylenediamine, 0.3% of super-overbased synthetic calcium sulfonate, and 0.1% of defoamer A868.

[0105] Comparative Example 15

[0106] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 24.8% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 0.5% copper corrosion inhibitor T571.

[0107] Comparative Example 16

[0108] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 24.3% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.1% defoamer A868, and 1% copper corrosion inhibitor T571.

[0109] Comparative Example 17

[0110] A special minimal lubricating oil for metal processing cold saws comprises the following components, calculated by mass percentage: 25.1% of palm oil, 70.3% of methyl palmitate, 3% of phosphite, 0.5% of 2,6-di-tert-butyl-4-methylphenol, 0.5% of N,N-di-sec-butyl-p-phenylenediamine, 0.3% of super-overbased synthetic calcium sulfonate, and 0.3% of copper corrosion inhibitor T571.

[0111] Comparative Example 18

[0112] A special minimal lubrication oil for metal processing cold saws comprises the following components, calculated by mass percentage: 24.6% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-overbased synthetic calcium sulfonate, 0.5% defoamer A868, and 0.3% copper corrosion inhibitor T571.

[0113] The various properties of the above metal processing cold saw minimal lubrication special oils were tested separately.

[0114] The viscosity is measured in accordance with GB / T 265 Determination of kinematic viscosity and calculation of dynamic viscosity of petroleum products.

[0115] The open cup flash point is determined in accordance with GB / T 3536 Petroleum Products Determination of Flash Point and Fire Point (Cleveland Open Cup Method).

[0116] The pour point is determined in accordance with GB / T 3535 Determination of pour point of petroleum products.

[0117] The four-ball test is carried out in accordance with GB / T 12583 Determination of extreme pressure properties of lubricants (four-ball method).

[0118] The rotating oxygen and nitrogen test is carried out in accordance with SH / T 0193 Determination of Antioxidant Stability of Lubricating Oils.

[0119] Liquid phase corrosion is carried out in accordance with GB / T 11143 Test method for rust prevention performance of mineral oil with inhibitor in the presence of water.

[0120] The foam is tested in accordance with GB / T 12579-2002 Determination of Foam Characteristics of Lubricating Oils.

[0121] 1. The viscosity, open flash point, and pour point of the metalworking cold saw minimal lubrication oils of Examples 1-3 and Comparative Examples 1-3 were tested. The results are shown in Table 1.

[0122] Table 1

[0123]

[0124]

[0125] The tests in Table 1 primarily explored the effects of adjusting the dosage of palm oil, methyl palmitate, and phosphite on the stability of specialty oils. The results show that Examples 1-3 all had lower viscosities than Comparative Examples 1-3, while exhibiting better performance in viscosity index, open-cell flash point, and pour point. Comparative Example 1 had the highest viscosity and a poor viscosity index, while Comparative Example 3 had intermediate viscosity and viscosity index. Comparative Example 2 had a lower viscosity and a higher viscosity index. Comparative Example 1 had the highest open-cell flash point, while Comparative Example 3 performed intermediately, and Comparative Example 2 had the worst. In terms of pour point, Comparative Example 2 ranked second, while Comparative Example 3 performed intermediately, and Comparative Example 1 had the worst. These results demonstrate that when palm oil and synthetic esters are used in appropriate proportions, optimal values for viscosity, viscosity index, open-cell flash point, and pour point can be achieved.

[0126] 2. The lubricating properties of the metalworking cold saw minimal lubrication oils of Examples 1, 4, 5, and Comparative Examples 4-6 were tested. The four-ball PB and PD test results are shown in Table 2, and the tapping torque test results are shown in Table 3.

[0127] Table 2

[0128]

[0129]

[0130] Table 3

[0131]

[0132] As shown in Tables 2 and 3, Examples 1, 4, and 5 exhibit the best lubrication performance, while Comparative Example 5 performs second best with PB and poor PD. Comparative Example 6 performs moderately well with PB and good PD, while Comparative Example 4 performs the worst. Synthetic esters added in appropriate proportions form a dense oil film on the metal surface, effectively reducing friction and providing excellent lubrication. In the tapping torque test, the lubricant from Example 1 exhibited the best temperature rise, followed by Comparative Example 6, with Comparative Example 5 performing moderately well, and Comparative Example 4 performing the worst. This demonstrates that lubrication performance can directly influence temperature rise, which can address the challenge of oil overheating during machining.

[0133] 3. The anti-oxidation effects of the metalworking cold saw minimal lubrication oils of Examples 1, 6, 7 and Comparative Examples 7-10 were tested. The results are shown in Table 4.

[0134] Table 4

[0135]

[0136]

[0137] The main difference between Examples 1, 6, 7 and Comparative Examples 7-10 lies in the adjustment of the antioxidant. As can be seen from the results in Table 4, Examples 1, 6 and 7 performed best, Comparative Example 9 performed second, Comparative Examples 7 and 8 performed medium, and Comparative Example 10 performed the worst. This shows that antioxidants have a very significant antioxidant effect in oil products. Simply relying on the antioxidant capacity of the base oil is obviously insufficient. Adding a single antioxidant and adding an excessive amount of antioxidant will not produce a synergistic antioxidant effect. Therefore, the proportion of antioxidants added must be appropriate to achieve the desired effect.

[0138] 4. The rust prevention properties of the metalworking cold saw minimal lubrication oils of Examples 1, 8, 9 and Comparative Examples 11-13 were tested. The results are shown in Table 5.

[0139] Table 5

[0140] sample Rust condition Hydrolysis Example 1 No rust normal Example 8 No rust normal Example 9 No rust normal Comparative Example 11 rust normal Comparative Example 12 rust normal Comparative Example 13 No rust hydrolysis

[0141] The main difference between Examples 1, 8, 9, and Comparative Examples 11-13 lies in the adjustment of the rust inhibitor. The results are shown in Table 5: Examples 1, 8, and 9 exhibit superior rust prevention performance compared to the comparative examples; Comparative Examples 4-1 and 4-2 exhibit inferior rust prevention. The present invention achieves optimal rust prevention performance at a 0.3% rust inhibitor dosage. Lower dosages provide suboptimal rust prevention, while higher dosages also yield suboptimal results and increase the risk of hydrolysis.

[0142] 5. The copper corrosion inhibition performance of the metal processing cold saw minimal lubrication special oils of Examples 1, 10, 11 and Comparative Examples 14-16 was tested. The results are shown in Table 6.

[0143] Table 6

[0144] sample Appearance Copper corrosion (grade) Example 1 Uniform 1A Example 10 Uniform 1A Example 11 Uniform 1A Comparative Example 14 Uniform 3A Comparative Example 15 Uniform 1B Comparative Example 16 precipitation 1B

[0145] The main difference between Examples 1, 10, 11 and Comparative Examples 14-16 lies in the adjustment of the copper corrosion inhibitor. From the results in Table 6, it can be seen that Examples 1, 10 and 11 have the best copper corrosion inhibition, Comparative Example 14 performs poorly, Comparative Examples 15 and 16 are comparable to Examples 1, 10 and 11, but the addition amount of Comparative Example 16 is too much, and there is a risk of precipitation, so the addition ratio should be appropriate.

[0146] 6. The defoaming properties of the metalworking cold saw minimal lubrication oils of Examples 1, 12-14, and Comparative Examples 17-19 were tested, and the structures are shown in Table 7.

[0147] Table 7

[0148]

[0149]

[0150] The main difference between Examples 1, 12-14 and Comparative Examples 17-18 lies in the adjustment of the defoaming agent. In Table VII, Examples 1, 12 and 13 have the best antifoaming properties, while Comparative Examples 17 and 18 perform poorly. Among them, there is a risk of precipitation due to excessive addition of Comparative Example 18, so it is better to add an appropriate ratio.

[0151] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A special oil for minimal lubrication of metal processing cold saws, characterized in that: Calculated by mass percentage, the invention comprises the following components: 23% to 28% of palm oil, 70% to 75.5% of synthetic ester, 0.1% to 1.0% of antioxidant, 0.3% to 0.4% of rust inhibitor, 0.1% to 0.2% of defoaming agent, and 0.3% to 0.4% of copper corrosion inhibitor; the synthetic ester comprises methyl palmitate and phosphite.

2. The metal processing cold saw minimal lubrication special oil according to claim 1, characterized in that: The mass ratio of the palmitic acid methyl ester to the phosphite is (70-73):

3.

3. The metal processing cold saw minimal lubrication special oil according to claim 1, characterized in that: The antioxidant includes 2,6-di-tert-butyl-4-methylphenol and N,N-di-sec-butyl-p-phenylenediamine.

4. The metal processing cold saw minimal lubrication special oil according to claim 3, characterized in that: The mass ratio of the 2,6-di-tert-butyl-4-methylphenol to N,N-di-sec-butyl-p-phenylenediamine is (0.8-1.2):

1.

5. The metal processing cold saw minimal lubrication special oil according to claim 1, characterized in that: The rust inhibitor includes at least one of super-overbased synthetic calcium sulfonate and sodium sulfonate.

6. The metal processing cold saw minimal lubrication special oil according to claim 1, characterized in that: The defoaming agent includes at least one of defoaming agent A868 and a high-efficiency hydrocarbon oil-based defoaming agent.

7. The metal processing cold saw minimal lubrication special oil according to claim 1, characterized in that: The copper corrosion inhibitor includes at least one of copper corrosion inhibitor T571 and copper corrosion inhibitor T501.

8. The metal processing cold saw minimal lubrication special oil according to claim 1, characterized in that: Calculated by mass percentage, it includes the following components: 25% palm oil, 70.3% methyl palmitate, 3% phosphite, 0.5% 2,6-di-tert-butyl-4-methylphenol, 0.5% N,N-di-sec-butyl-p-phenylenediamine, 0.3% super-high base synthetic calcium sulfonate, 0.1% defoaming agent, and 0.3% copper corrosion inhibitor.

9. A method for preparing special lubricating oil, characterized in that: The method for preparing the special minimal lubrication oil for metalworking cold saws according to any one of claims 1 to 8 comprises the following steps: Mix palm oil and synthetic ester and stir until homogeneous and transparent; Slowly add antioxidant to the mixed solution and stir until it becomes homogeneous and transparent; Add rust inhibitor, defoamer and copper corrosion inhibitor in sequence and stir until uniform to obtain transparent metal processing cold saw minimal lubrication special oil.

10. The method for preparing special lubricating oil according to claim 9, characterized in that: When mixing palm oil and synthetic ester, the temperature is controlled at 50-55°C.

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