A clean cycloalkyl copper cold rolling emulsified oil and its preparation method and application

Abstract

The present invention belongs to the technical field of metal processing lubrication, and specifically relates to a clean cycloalkyl copper cold rolling emulsified oil and its preparation method and application. The clean cycloalkyl copper cold rolling emulsified oil comprises, by mass percentage, 4% to 6% emulsifier, 2% to 5% friction modifier, 3% to 5% metal deactivator, 2% to 4% extreme pressure anti-wear agent, 0% to 1% antioxidant, 0% to 1% bactericide, and the remainder of base oil. The base oil has a kinematic viscosity of 40 to 50 mm at 40°C. 2 / s of hydrotreated naphthenic oil. Compared with the traditional paraffin-based copper cold rolling emulsified oil, the present invention has the advantages of low pour point, strong stability, high cleanliness, good annealing cleanliness, strong friction reduction ability, and anti-discoloration of copper strip, and is suitable for process lubrication of copper and copper alloy plate and strip cold rolling process.

Description

Technical Field

[0001] The invention belongs to the technical field of metal processing lubrication, and in particular relates to a clean cycloalkyl copper cold rolling emulsified oil and a preparation method and application thereof. Background Art

[0002] During the cold rolling process of copper and copper alloy plates and strips, severe metal deformation is accompanied by a large amount of friction and wear, deformation heat and friction heat. Lubrication and cooling must be taken into account. Therefore, emulsions are needed for cold rolling process lubrication to achieve the purpose of reducing rolling power consumption, improving the surface quality of the rolled plates and strips, reducing temperature, and protecting the rollers.

[0003] At present, copper cold rolling emulsified oil mainly uses paraffin-based mineral oil as the base oil, and sometimes mixes with some vegetable oil or synthetic ester, which has the problems of high pour point and poor annealing detergency. Compared with paraffin-based oil, naphthenic oil has the characteristics of less wax content, high density, strong solubility, large evaporation loss, low viscosity index and high friction coefficient. As the base oil of copper cold rolling emulsion, compared with traditional paraffin-based oil, cycloalkyl oil has the following advantages: due to less wax content, cycloalkyl oil has a lower pour point, which is conducive to storage and use in seasons or regions with lower temperatures; due to its high density, the density of cycloalkyl oil is closer to that of water, which is conducive to the emulsified oil not being easy to stratify after being diluted into an emulsion, and has better dispersion stability; in cold rolling production, miscellaneous oils such as hydraulic oil and oil film bearing oil often leak into the emulsion system. The good solubility of cycloalkyl oil can improve the emulsion's resistance to miscellaneous oils and reduce the impact of miscellaneous oils on the cleanliness of the copper strip after rolling; due to the large evaporation loss of cycloalkyl oil, the oil remaining on the surface after rolling can be fully volatilized and decomposed during the annealing process, which is conducive to improving annealing cleanliness.

[0004] In the application scenarios of equipment lubricating oil, the lubrication state is mostly in elastic fluid lubrication. Since the viscosity index of cyclopentane oil is low, the decrease in the viscosity of cyclopentane oil will have an adverse effect as the operating temperature of the equipment increases. Cold rolling lubrication is mostly in a mixed lubrication state of extreme pressure lubrication and fluid lubrication. The emulsified oil is diluted into an emulsion as a lubricating medium. The water phase can provide good cooling capacity, which can keep the oil in a relatively stable temperature range and will not cause similar problems. Compared with other common non-ferrous metals, copper cold rolling has greater deformation resistance; compared with ferrous metals, copper cold rolling has higher requirements for cleanliness and surface quality of rolled strips. Since the friction coefficient of cyclopentane oil is higher than that of paraffin-based oil, traditional copper cold rolling process lubrication often uses paraffin-based oil as the base oil, and sometimes compounded with some vegetable oil or synthetic ester to further improve the lubrication effect. However, the base oil only provides the most basic lubrication effect. The shortcomings of cyclopentane base oil can be compensated by the design of functional additives, while giving the product many advantages such as high pour point, good dispersion stability, and good annealing cleanliness.

[0005] In summary, cycloalkane oil has many advantages in the application of copper cold rolling lubrication and has broad application prospects. At present, cycloalkane oil is mainly used in transformer oil, refrigeration oil, and rubber oil in China, but is less used in copper cold rolling emulsified oil. Summary of the invention

[0006] Aiming at the limitations of existing copper cold rolling emulsified oil products, the present invention provides a copper cold rolling emulsified oil with low pour point, good annealing cleanliness, strong friction reduction ability and anti-copper strip discoloration, and also provides a preparation method and application of the emulsified oil.

[0007] The technical solution of the present invention is as follows:

[0008] Firstly, as one of the purposes of the present invention, a clean cycloalkyl copper cold rolling emulsified oil is provided, which comprises, by mass percentage, 4% to 6% of an emulsifier, 2% to 5% of a friction modifier, 3% to 5% of a metal deactivator, 2% to 4% of an extreme pressure anti-wear agent, 0% to 1% of an antioxidant, 0% to 1% of a bactericide, and the remainder of base oil.

[0009] The base oil has a kinematic viscosity of 40 to 50 mm at 40°C. 2 / s of hydrotreated cycloalkane oil.

[0010] The emulsifier is a fatty alcohol polyoxyethylene ether, wherein the fatty alcohol group is one or more combinations of lauryl alcohol, tridecanol, tetradecanol, etc. Preferably, the hydrophilic-lipophilic balance value of the emulsifier is in the range of 9 to 12.

[0011] More preferably, the emulsifier is a compound of two or more fatty alcohol polyoxyethylene ethers with different polymerization degrees, and the ethylene oxide polymerization degree of each fatty alcohol polyoxyethylene ether is in the range of 3-9.

[0012] The friction modifier is fatty alcohol polyoxyethylene ether phosphate monoester, and the fatty alcohol group thereof is one or more of dodecanol, tridecanol, and tetradecanol.

[0013] The metal deactivator is selected from one or two of 1H-benzotriazole-1-yl-N,N-di(2-ethylhexyl)-4-methylmethylamine and 2,5-di(tert-dodecyl disulfide)-1,3,4-thiadiazole.

[0014] The extreme pressure anti-wear agent is a phosphorus-based extreme pressure agent, specifically selected from a mixture of one or more of di-n-butyl acid phosphate n-octylamine salt, tricresyl phosphate, and di-n-butyl phosphite.

[0015] As another object of the present invention, the present application also provides a preparation method and application of the copper cold rolling emulsified oil as described above.

[0016] The method for preparing the copper cold rolling emulsified oil of the present invention specifically comprises:

[0017] Heat the hydrotreated cycloalkyl oil to 40°C to 70°C, add bactericide, antioxidant, extreme pressure anti-wear agent, metal deactivator, friction modifier and emulsifier, stir the emulsified oil until all components are fully dissolved, and the clean cycloalkyl copper cold rolling emulsified oil can be obtained.

[0018] Preferably, when the emulsifier or friction modifier or metal deactivator or extreme pressure anti-wear agent or antioxidant or bactericide is a combination of multiple substances, they are first compounded and heated to 40°C to 70°C, and stirred continuously until the group is mixed evenly before adding them to the base oil.

[0019] When the copper cold rolling emulsified oil is used, the emulsified oil is diluted with desalted water to an emulsion with a mass fraction of 1% to 5%. It is recommended to control the temperature of the emulsion circulation system at 45 to 55° C. during rolling.

[0020] Through the above technical solution, the beneficial effects of the present invention are:

[0021] 1. The product of the present invention has good cleanliness, including rolling mill cleanliness, post-rolling plate and strip cleanliness, and annealing cleanliness. The oil splashed onto the equipment during rolling has a high pour point and is not easy to solidify into sludge, so it has good rolling mill cleanliness. This product has good resistance to foreign oils and can effectively reduce the impact of leaked foreign oils on the cleanliness of the plate and strip after rolling. Due to the good emulsification of this product, the oil remaining on the surface of the plate and strip after rolling can be easily removed in the degreasing process. The components of this product have little high-temperature residue and have good annealing cleanliness.

[0022] 2. The product of the present invention has good emulsification performance and is not easy to foam. Cycloalkane base oil has good dispersion stability and can have good emulsification performance while reducing the amount of emulsifier added. The emulsification efficiency of the emulsifier can be improved by regulating the hydrophilic-lipophilic balance value of the emulsifier. Fatty alcohol polyoxyethylene ether phosphate monoester not only acts as a friction modifier, but also has a certain emulsification effect as a surfactant. The present invention belongs to a non-ionic emulsification system, which can maintain a good emulsification effect within a certain water hardness and pH value range. Since there is no need to add too much emulsifier, the product of the present invention is not easy to foam after being diluted into an emulsion.

[0023] 3. The product of the present invention has good lubrication performance. Long carbon chain fatty alcohol polyoxyethylene ether phosphate monoester is used as a friction modifier. Different from the common synthetic ester friction modifier, the polar group of phosphate ester greatly improves the adsorption of the molecule to the metal surface, and the group located at the end of the molecular chain can make the molecule tightly adsorbed vertically on the metal surface. The long carbon chain monoester structure is conducive to the formation of multilayer adsorption to increase the thickness of the adsorption film, greatly reducing the friction coefficient, and can effectively make up for the disadvantage of the high friction coefficient of cycloalkyl oil. The anti-wear performance of cycloalkyl oil at similar viscosity is better than that of paraffin-based oil, which can weaken the wear caused by the friction chemical reaction of fatty alcohol polyoxyethylene ether phosphate monoester.

[0024] 4. The product of the present invention uses phosphorus-based extreme pressure agents instead of sulfur-based and chlorine-based extreme pressure agents, and is supplemented with benzotriazole derivatives and thiadiazole derivatives as metal deactivators, which can effectively inhibit the chemical corrosion of active elements on the copper surface and cause discoloration of the copper strip. While the fatty alcohol polyoxyethylene ether phosphate monoester is used as a friction modifier, its phosphate group, as a typical anti-rust group, can provide an anti-rust effect between processes, further improving the surface quality of the copper strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the stratification of Example 1 and the emulsion prepared by replacing the base oil in Example 1 with paraffin base oil 220N and then letting it stand for 30 minutes. DETAILED DESCRIPTION

[0026] The invention will be further described below in conjunction with specific embodiments, so that those skilled in the art can further understand the invention, but it is not intended to limit the content of the invention. All technologies based on the principles described in the invention belong to the scope of the invention.

[0027] Example 1

[0028]

[0029]

[0030] Emulsifier and metal deactivator are compounded separately, heated to 50°C and stirred evenly. Add bactericide, antioxidant, extreme pressure anti-wear agent, compound metal deactivator, friction modifier and compound emulsifier to the base oil, heat to 50°C, and stir to fully dissolve the additives to obtain clean cycloalkyl copper cold rolling emulsified oil. When using, according to the specific rolling conditions, dilute the emulsified oil with desalted water to an emulsion with a mass fraction of 1% to 5%, which can be used for cold rolling process lubrication of copper and copper alloy plates and strips.

[0031] The base oil in Example 1 was replaced with paraffin base oil 220N to prepare an emulsified oil, which was then prepared into an emulsion with the product of Example 1. After standing for 30 minutes, the stratification was observed as follows: Figure 1 As shown, for the convenience of observation, the emulsion concentration is set to 10%. It can be found that the emulsion prepared by hydrotreating cycloalkyl oil in Example 1 of the present application has better dispersion stability.

[0032] Example 2

[0033]

[0034] Emulsifier and metal deactivator are compounded separately, heated to 45°C and stirred evenly. Add bactericide, antioxidant, extreme pressure anti-wear agent, compound metal deactivator, friction modifier and compound emulsifier to the base oil, heat to 45°C, and stir to fully dissolve the additives to obtain clean cycloalkyl copper cold rolling emulsified oil. When using, according to the specific rolling conditions, dilute the emulsified oil with desalted water to an emulsion with a mass fraction of 1% to 5%, which can be used for cold rolling process lubrication of copper and copper alloy plates and strips.

[0035] Example 3

[0036]

[0037] Metal deactivator and extreme pressure anti-wear agent are compounded separately, heated to 55°C and stirred evenly. Add bactericide, antioxidant, compound extreme pressure anti-wear agent, compound metal deactivator, friction modifier and compound emulsifier to base oil, heat to 55°C, and stir to fully dissolve the additives to obtain clean cycloalkyl copper cold rolling emulsified oil. When using, according to the specific rolling conditions, dilute the emulsified oil with desalted water to an emulsion with a mass fraction of 1% to 5%, which can be used for cold rolling process lubrication of copper and copper alloy plates and strips.

[0038] Example 4

[0039]

[0040] Emulsifier, metal deactivator, and extreme pressure anti-wear agent are compounded separately, heated to 50°C and stirred evenly. Add bactericide, antioxidant, compound extreme pressure anti-wear agent, compound metal deactivator, friction modifier, and compound emulsifier to the base oil, heat to 50°C, and stir to fully dissolve the additives to obtain a clean cycloalkyl copper cold rolling emulsified oil. When used, according to the specific rolling conditions, the emulsified oil is diluted with desalted water to an emulsion with a mass fraction of 1% to 5%, which can be used for cold rolling process lubrication of copper and copper alloy plates and strips.

[0041] Comparative Example 1

[0042] The test indicators of a domestic copper cold rolling emulsified oil sold on the market are as follows:

[0043] project Test results Experimental methods Emulsified oil appearance Light yellow transparent liquid Visual inspection <![CDATA[Density (g / cm 3 )]]> 0.89 SH / T 0604 <![CDATA[Kinematic viscosity (40 °C, mm 2 / s)]]> 57 GB / T 265 Acid value (mgKOH / g) 5.9 GB / T 264 Saponification value (mgKOH / g) 49 GB / T 8021

[0044] According to the corresponding experimental methods, Examples 1-4 and Comparative Example 1 were prepared into emulsions with a concentration of 5%, and the tribological properties in the four-ball friction and wear test were compared. The results are shown in the following table:

[0045]

[0046] The above embodiments are all preferred embodiments of the present invention, but the implementation methods of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A clean copper cold rolling emulsified oil, characterized in that: Its composition, by mass percentage, includes: emulsifier 4%~6%, friction modifier 2%~5%, metal deactivator 3%~5%, extreme pressure anti-wear agent 2%~4%, antioxidant 0~1%, bactericide 0~1%, and base oil balance; The friction modifier is fatty alcohol polyoxyethylene ether phosphate monoester; The extreme pressure anti-wear agent is specifically selected from a mixture of one or more of di-n-butyl acid phosphate n-octylamine salt, tricresyl phosphate, and di-n-butyl phosphite; The base oil has a kinematic viscosity of 40 to 50 mm at 40°C. 2 / s of hydrotreated naphthenic oil; The emulsifier is a fatty alcohol polyoxyethylene ether, wherein the fatty alcohol group is one or more combinations of dodecanol, tridecanol, and tetradecanol, and the hydrophilic-lipophilic balance value of the emulsifier is in the range of 9 to 12; The fatty alcohol group of the fatty alcohol polyoxyethylene ether phosphate monoester is one or more of dodecanol, tridecanol, and tetradecanol; The metal deactivator is selected from one or two of 1H-benzotriazole-1-yl-N,N-di(2-ethylhexyl)-4-methylmethylamine and 2,5-di(tert-dodecyl disulfide)-1,3,4-thiadiazole.

2. A clean copper cold rolling emulsified oil according to claim 1, characterized in that: The emulsifier is a compound of two or more fatty alcohol polyoxyethylene ethers with different polymerization degrees, and the ethylene oxide polymerization degree of each fatty alcohol polyoxyethylene ether is in the range of 3-9.

3. The method for preparing the clean copper cold rolling emulsified oil according to claim 1, characterized in that: Specifically include: Heat the hydrotreated cycloalkane oil to 40℃~70℃, add bactericide, antioxidant, extreme pressure anti-wear agent, metal deactivator, friction modifier and emulsifier, stir the emulsified oil until all components are fully dissolved, and then you can get the clean copper cold rolling emulsified oil.

4. The method for preparing the clean copper cold rolling emulsified oil according to claim 3, characterized in that: When the emulsifier or friction modifier or metal deactivator or extreme pressure anti-wear agent or antioxidant or bactericide is a combination of multiple substances, they are first compounded and heated to 40°C~70°C, and stirred continuously until the mixture is uniformly mixed before adding them to the hydrotreated cycloalkane oil.

5. The application method of the clean copper cold rolling emulsified oil according to claim 1, characterized in that: When in use, use desalted water to dilute the emulsified oil into an emulsion with a mass fraction of 1%~5%. During rolling, the temperature of the emulsion circulation system is controlled at 45~55℃.

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