Oxygen-free copper cold rolling oil

Abstract

The invention relates to the technical field of lubricating oil, in particular to oxygen-free copper cold rolling oil. The lubricating oil comprises the following components: 5-15% of synthetic ester lubricating oil, 1-8% of a high-molecular extreme pressure agent, 0.1-3% of a corrosion inhibitor, 0.5-1% of an anti-wear agent, 2-5% of an anti-rust agent and the balance of base oil. The prepared cold rolling oil meets the lubricating requirement of oxygen-free copper; by compounding and using the three types of hydrogenated base oil and alpha-olefin synthetic oil, the lubricating property of the lubricating oil can be improved, and the average wear scar diameter of oxygen-free copper is controlled within 0.5 mm; by limiting the weight ratio of the three types of hydrogenated base oil to the alpha-olefin synthetic oil to be (2-6): 1, the lubricating property can be further improved, and the average friction coefficient is reduced to 0.08.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils, and specifically, to an oxygen-free copper cold rolling oil. Background Art

[0002] Cold rolling oils are applicable to cold rolling, stretching, deep drawing, bulge stretching, multi-pass stretching, stamping, punching and other processing technologies of metal products such as stainless steel, alloy steel, and titanium alloy, and play a role in lubrication and cooling. Among them, OFC (oxygen-free copper) refers to metallic copper with a purity of 99.995%. It is generally used in electrical and electronic applications such as audio equipment, vacuum electronic devices, and cables. Therefore, the cold rolling oil for oxygen-free copper needs to meet higher standards in terms of lubricity, cooling performance, and rust prevention.

[0003] Chinese invention patent CN105154186A, a rolling oil composition for cold rolling plain carbon steel plates and its preparation method, is composed of palm oil, diethanolamide oleate, diethanolamide coconut oilate, sulfonated lard, rust inhibitor, antioxidant, and machine oil, and has good annealing cleanliness and rust prevention performance. However, this composition contains a large amount of emulsifiers and is an emulsified product. CN103275792A, an environmentally friendly stainless steel pipe rolling oil, is composed of a composite base oil, antioxidant, extreme pressure agent, oiliness agent, rust inhibitor, and antifoaming agent. However, its base oil (content 88-90%) is composed of a composite of ricinoleic-based dioctyl sebacate and pentaerythritol tetraoctylate, and the extreme pressure agent contains chlorinated paraffin, which is not conducive to the corrosion of steel plates. Summary of the Invention

[0004] The present invention provides an oxygen-free copper cold rolling oil. By weight percentage, the components include: 5-15% of synthetic ester lubricating oil, 1-8% of high molecular extreme pressure agent, 0.1-3% of corrosion inhibitor, 0.5-1% of anti-wear agent, 2-5% of rust inhibitor, and the balance is made up by base oil.

[0005] The base oil includes three types of hydrotreated base oils and α-olefin synthetic oil.

[0006] Preferably, the three types of hydrotreated base oils include at least one of the following grades: 100N, 150N, 250N, all provided by CNOOC.

[0007] Preferably, the α-olefin synthetic oil includes at least one of the following grades: PAO4, PAO6, all provided by Mobil.

[0008] Preferably, the weight ratio of PAO4 to PAO6 is (1-4):1.

[0009] More preferably, the weight ratio of PAO4 to PAO6 is (1-3):1.

[0010] The weight ratio of the three types of hydrotreated base oils to the α-olefin synthetic oil is (2 - 6):1.

[0011] Preferably, the weight ratio of the three types of hydrotreated base oils to the α-olefin synthetic oil is (2 - 4):1.

[0012] The research of this application found that by compounding and using the three types of hydrotreated base oils and the α-olefin synthetic oil, the lubricating performance of the lubricating oil can be improved, and the average wear scar diameter of oxygen-free copper can be controlled within 0.5 mm. It may be that the compounding of the three types of hydrotreated base oils and the α-olefin synthetic oil increases the viscosity index of the cold rolling oil, avoids the viscosity change caused by temperature change during the working process, and at the same time ensures the fluidity of the system, thus ensuring the performance of the lubricating oil at various temperatures. The further research of this application found that by limiting the weight ratio of the three types of hydrotreated base oils to the α-olefin synthetic oil to (2 - 6):1, the lubricating performance can be further improved, and the average friction coefficient can be reduced to 0.08. It may be the interaction between the chain segments of the two base oils that, while avoiding phase separation, forms an oil film with a higher degree of homogeneity, improving the wettability and coating property of oxygen-free copper.

[0013] The synthetic ester lubricating oil includes at least one of pentaerythritol oleate, trimethylolpropane trioleate (TMPTO), isooctyl palmitate (2EHP), isooctyl stearate, and dibutyl phthalate.

[0014] Preferably, the synthetic ester lubricating oil includes trimethylolpropane trioleate and / or isooctyl palmitate.

[0015] The high molecular extreme pressure agent includes an ester polymer, and the kinematic viscosity of the ester polymer at 40 °C is 2000 - 5000 mm 2 / s.

[0016] Preferably, the kinematic viscosity of the ester polymer at 40 °C is 2000 - 3500 mm 2 / s.

[0017] Preferably, the kinematic viscosity of the ester polymer at 40 °C is 2800 mm 2 / s, provided by Lubrizol, model GY25.

[0018] The elements in the anti-wear agent include phosphorus and / or sulfur.

[0019] The phosphorus content in the anti-wear agent is 0.1 - 1 wt%, and the sulfur content is 2 - 3 wt%.

[0020] Preferably, the phosphorus content in the anti-wear agent is 0.1 - 0.8 wt%, and the sulfur content is 2 - 2.5 wt%.

[0021] Preferably, the anti-wear agent has a phosphorus content of 0.56 wt% and a sulfur content of 2.25 wt%, and is provided by Afton Chemical Corporation, with the model number H543.

[0022] This application's research found that the elements in the anti-wear agent include phosphorus and / or sulfur, and it is specified that the phosphorus content is 0.1 - 1 wt% and the sulfur content is 2 - 3 wt%. While improving the wear resistance, it can further enhance the lubrication performance and reduce the average friction coefficient to 0.07. Sulfur elements can form an iron sulfide film on the metal surface, effectively preventing wear and sintering of the metal surface. As the temperature of the contact surface of the friction pair increases, the S - S bond or C - S bond will break and chemically react with the metal to form a denser iron sulfide film. However, too high a sulfur content is prone to reacting with oxygen at high temperatures to generate compounds such as sulfates, which may cause an increase in the viscosity of the lubricating oil and a change in color, thereby affecting the lubrication performance. Phosphorus elements can form an organic phosphate chemical reaction film on the metal surface, acting as an isolation for oxygen and reducing the occurrence of the oxidation reaction of sulfur elements at high temperatures.

[0023] The rust inhibitor includes barium-based compounds and / or calcium-based compounds.

[0024] Preferably, the barium-based compound includes barium dinonylnaphthalene sulfonate (T705) and / or barium petroleum sulfonate.

[0025] Preferably, the calcium-based compound is at least one of calcium dodecylbenzenesulfonate, calcium dinonylnaphthalene sulfonate, calcium aminosulfonate, and calcium benzoate.

[0026] Preferably, the calcium-based compound is selected from H611 produced by Afton Chemical Corporation.

[0027] The corrosion inhibitor is provided by Shanghai Yucheng Chemical Industry.

[0028] The weight ratio of the anti-wear agent to the rust inhibitor is 1:(2 - 6).

[0029] Preferably, the weight ratio of the anti-wear agent to the rust inhibitor is 1:(3 - 5).

[0030] This application's research found that by specifying the weight ratio of the anti-wear agent to the rust inhibitor as 1:(2 - 6), the lubrication performance and anti-corrosion performance can be improved simultaneously. Oxygen-free copper sheets can be immersed in a 100 °C oil bath at high temperature for 3 h without changing color. It may be that the active components in the anti-wear agent and the rust inhibitor form an interlaced and orderly continuous film layer, improving the density and continuity of the film layer. The anti-wear agent reduces the heat generated by friction and wear particles, thus reducing the burden on the rust inhibitor, while the rust inhibitor can protect the metal surface from corrosion and extend the service life of the anti-wear agent; at the same time, the compounding of the two in a specific ratio promotes the synergy of chemical adsorption and physical adsorption. The film layer formed by chemical adsorption is more stable and not easily detached; while physical adsorption helps to quickly form a film layer and improve the response speed of the lubricating oil.

[0031] The weight ratio of the synthetic ester lubricating oil, the polymer extreme pressure agent and the base oil is 1:(0.3 - 1):(10 - 20).

[0032] Preferably, the weight ratio of the synthetic ester lubricating oil, the polymer extreme pressure agent and the base oil is 1:(0.3 - 0.8):(15 - 20).

[0033] The preparation method of the oxygen-free copper cold rolling oil comprises the following steps: mixing all components evenly to obtain the oxygen-free copper cold rolling oil.

[0034] Beneficial effects

[0035] 1. The cold rolling oil prepared in this application meets the lubrication requirements of oxygen-free copper.

[0036] 2. By compounding and using three types of hydrogenated base oils and α-olefin synthetic oil, the lubrication performance of the lubricating oil can be improved, and the average wear scar diameter of oxygen-free copper is controlled within 0.5 mm.

[0037] 3. By limiting the weight ratio of the three types of hydrogenated base oils and α-olefin synthetic oil to (2 - 6):1, the lubrication performance can be further improved, and the average friction coefficient is reduced to 0.08.

[0038] 4. The elements in the anti-wear agent include phosphorus and / or sulfur, and the phosphorus content is limited to 0.1 - 1 wt%, and the sulfur content is 2 - 3 wt%.

[0039] While improving the wear resistance, the lubrication performance can be further improved, and the average friction coefficient is reduced to 0.07.

[0040] 5. By limiting the weight ratio of the anti-wear agent and the rust inhibitor to 1:(2 - 6), the lubrication performance and the corrosion prevention performance can be improved simultaneously, so that the oxygen-free copper sheet can be soaked in a 100°C oil bath at high temperature for 3 h without discoloration. Description of the drawings

[0041] Figure 1 It is a photo of the oxygen-free copper sheet treated with the cold rolling oil in Example 1 soaked in a 100°C oil bath at high temperature for 3 h.

[0042] Figure 2 It is a photo of the oxygen-free copper sheet treated with the cold rolling oil in Comparative Example 2 soaked in a 100°C oil bath at high temperature for 3 h. Detailed implementation manners

[0043] Example 1

[0044] An oxygen-free copper cold rolling oil, by weight percentage, the components are as follows:

[0045] Base oil (three types of hydrogenated base oil, 100N, CNOOC): 74.3%

[0046] Base oil (α-olefin synthetic oil, PAO4, Mobil, poly-α-olefin base oil): 10%

[0047] Base oil (α-olefin synthetic oil, PAO6, Mobil, poly-α-olefin base oil): 5%

[0048] Synthetic ester lubricating oil (2EHP, Guangzhou Qisheng): 5%

[0049] High molecular extreme pressure agent (kinematic viscosity at 40°C is 2800 mm 2 / s, provided by Lubrizol, model GY25): 3%

[0050] Corrosion inhibitor (Shanghai Yucheng Chemical Industry): 0.2%

[0051] Anti-wear agent (phosphorus content is 0.56 wt%, sulfur content is 2.25 wt%, provided by Afton Chemical Corporation, model H543): 0.5%

[0052] Rust inhibitor (H611, Afton): 1%

[0053] Rust inhibitor (T705, Afton): 1%

[0054] The preparation method of the cold rolling oil is as follows: Mix all components evenly to obtain it.

[0055] Comparative Example 1

[0056] A cold rolling oil, by weight percentage, the components are:

[0057] 150SN: 87%, Beili

[0058] S52 chlorinated paraffin: 5%, Shanghai Yingtai

[0059] T203: 3%, Guangzhou Bifeng

[0060] Palm oil: 5%, Guangzhou Runquan Chemical Industry

[0061] The preparation method of the cold rolling oil is as follows: Mix all components evenly to obtain it.

[0062] Comparative Example 2

[0063] A cold rolling oil, by weight percentage, the components are:

[0064] 150N: 45%

[0065] 60N: 40%

[0066] T306: 2%

[0067] T203: 5%

[0068] Rapeseed oil: 8%

[0069] The preparation method of the cold rolling oil is as follows: Mix all components evenly to obtain it.

[0070] Comparative Example 3

[0071] A rolling oil, by weight percentage, the components are:

[0072] Base oil (100N, CNOOC): 70%

[0073] Base oil (PAO4, Mobil, polyalphaolefin base oil): 24.8%

[0074] Synthetic ester lubricating oil (2EHP, Guangzhou Qisheng): 5%

[0075] Corrosion inhibitor (Shanghai Yucheng Chemical Industry): 0.2%

[0076] The preparation method of the cold rolling oil is as follows: Mix all components evenly to obtain it.

[0077] Comparative Example 4

[0078] A rolling oil, by weight percentage, the components are:

[0079] Base oil (60N, CNOOC): 33%

[0080] Base oil (100N, CNOOC): 30%

[0081] Base oil (PAO4, Mobil, polyalphaolefin base oil): 24.8%

[0082] Synthetic ester lubricating oil (2EHP, Guangzhou Qisheng): 8%

[0083] Synthetic ester lubricating oil (TMPTO, Guangzhou Qisheng): 4%

[0084] High molecular extreme pressure agent (kinematic viscosity at 40°C is 2800 mm 2 / s, provided by Lubrizol, model GY25): 3%

[0085] Corrosion inhibitor (Shanghai Yucheng Chemical Industry): 0.2%

[0086] The preparation method of the cold rolling oil is as follows: Mix all components evenly to obtain it.

[0087] Performance test method

[0088] Change the treatment of the oxygen-free copper sheet with the cold rolling oil prepared in the examples and comparative examples to sand the copper sheets required in the examples and comparative examples smooth with 800-mesh sandpaper, and then conduct the following performance tests. The test data are listed in Table 1.

[0089] 1. Copper corrosion prevention experiment: Immerse oxygen-free copper sheets in an oil bath at 100 °C for 3 hours at high temperature, and use a copper sheet corrosion tester HY-5096 for testing. Color comparison is carried out through a color comparison plate (ASTM METHOD D 130 / IP 154). As Figure 1 shown, the cold rolling oil of Example 1 has excellent corrosion and rust prevention performance. As Figure 2 shown, the cold rolling oil of Comparative Example 2 has significantly poor corrosion and rust prevention performance.

[0090] 2. Lubrication performance: Use a four-ball test tester HY-12583 to test the average friction coefficient, average wear scar diameter, and oil film strength of oxygen-free copper sheets.

[0091] Performance test data

[0092] Table 1

[0093] Average friction coefficient Average wear scar diameter, mm Oil film strength, N Copper corrosion prevention Example 1 0.0676 0.488 1432 1a (qualified) Comparative example 1 0.0824 0.424 1132 3a (unqualified) Comparative example 2 0.0887 0.458 1254 3a (unqualified) Comparative example 3 0.0734 0.524 1051 1a (qualified) Comparative example 4 0.0752 0.462 1330 1a (qualified)

Claims

1. An oxygen-free copper cold rolling oil, characterized in that: Calculated by weight percentage, the components include: 5-15% of synthetic ester lubricating oil, 1-8% of high molecular extreme pressure agent, 0.1-3% of corrosion inhibitor, 0.5-1% of anti-wear agent, 2-5% of rust inhibitor, and the balance is made up of base oil.

2. The oxygen-free copper cold rolling oil according to claim 1, characterized in that: The base oil includes three types of hydrogenated base oil and α-olefin synthetic oil.

3. The oxygen-free copper cold rolling oil according to claim 2, characterized in that: The weight ratio of the three types of hydrogenated base oils to the α-olefin synthetic oil is (2-6):

1.

4. The oxygen-free copper cold rolling oil according to claim 1, characterized in that: The synthetic ester lubricant oil includes at least one of pentaerythritol oleate, trimethylolpropane oleate, isooctyl palmitate, isooctyl stearate, and dibutyl phthalate.

5. The oxygen-free copper cold rolling oil according to claim 4, characterized in that: The polymer extreme pressure agent includes an ester polymer, and the kinematic viscosity of the ester polymer at 40° C. is 2000-5000 mm 2 / s.

6. The oxygen-free copper cold rolling oil according to claim 5, characterized in that: The elements in the antiwear agent include phosphorus and / or sulfur.

7. The oxygen-free copper cold rolling oil according to claim 6, characterized in that: The antiwear agent contains 0.1-1 wt% phosphorus and 2-3 wt% sulfur.

8. The oxygen-free copper cold rolling oil according to claim 1, characterized in that: The rust inhibitor includes a barium-based compound and / or a calcium-based compound.

9. The oxygen-free copper cold rolling oil according to claim 1, characterized in that: The weight ratio of the anti-wear agent to the rust inhibitor is 1:(2-6).

10. The oxygen-free copper cold rolling oil according to claim 9, characterized in that: The weight ratio of the synthetic ester lubricating oil, the polymer extreme pressure agent and the base oil is 1:(0.3-1):(10-20).

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