A stretching lubricant for battery shell and preparation method thereof

Abstract

The invention discloses a stretching lubricant for a battery shell and a preparation method thereof, and relates to the technical field of lubricating oils. The lubricant comprises the following raw materials in weight percentage: 50%-60% base oil, 2.5%-6.5% modifier, 20%-25% polyol ester, 3%-8% polyphosphate ester, 5%-10% dearomatization, and the remainder is a dispersant; the added polyol ester has good effects on wear reduction, cooling and lubrication; dearomatization makes the workpiece easy to dissipate heat and easy to clean during the stretching process, and is non-toxic and odorless; the composite phosphate has good anti-wear performance and flame retardant effect; when the modifier is added to the stretching lubricant component, the high polar end of the molecule has a strong affinity for the metal surface and can be adsorbed on the metal surface, while the non-polar carbon chain thereof extends into the base oil, and in this way, the modifier molecules are arranged on the metal surface in a direction to form a molecular film, thereby improving the lubrication performance and protecting the metal substrate to prevent strain.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating oils, and in particular to a stretching lubricating oil for a battery casing and a preparation method thereof. Background Art

[0002] The power battery is the core energy source of new energy vehicles, providing driving power for the entire vehicle. It mainly forms the battery body through the shell envelope. As the carrier of the battery module, the battery shell plays a key role in the safe operation and protection of the battery module.

[0003] The automotive power battery pack is made of aluminum alloy, which is easy to process, resistant to high temperature and corrosion, and has good heat transfer and electrical conductivity. The aluminum shell can be stretched and formed in one step, and compared with stainless steel, the bottom welding process can be omitted, and the quality will not be reduced due to the burning of metal elements during welding.

[0004] With the rapid development of new energy vehicles, the market for power battery aluminum shells is growing. The deformation of aluminum alloy materials is large during the stretching process of aluminum shells, and the stretching process has extremely high requirements for the lubrication of stretching oil. When using existing stretching oil, a large amount of aluminum powder will be generated due to the friction between aluminum alloy materials and molds during the stretching process. Stretching oil and aluminum powder will remain on the surface of the aluminum shell. The residual stretching oil and aluminum powder are difficult to clean, which will affect the quality of the finished aluminum shell, thereby reducing the product qualification rate. Therefore, the performance of the existing aluminum shell stretching oil needs to be improved. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a stretching lubricant for a battery shell and a preparation method thereof.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A stretching lubricant for a battery casing, comprising the following raw materials in weight percentage: 50%-60% base oil, 2.5%-6.5% modifier, 20%-25% polyol ester, 3%-8% polyphosphate ester, 5%-10% dearomatization, and the balance is a dispersant;

[0008] The modifier comprises the following steps:

[0009] Step S1, adding diphenylamine and a catalyst into a four-necked flask, stirring at a uniform speed and adding nonene, heating to 170° C. under a nitrogen atmosphere, stirring at a uniform speed and keeping the temperature for 4 hours, adding undecylenamide after the reaction, stirring at a uniform speed and keeping the temperature for 4 hours, after the reaction, filtering the obtained reaction solution while hot, and distilling under reduced pressure to obtain an intermediate;

[0010] In step S1, diphenylamine reacts with nonene under the action of a catalyst, and a long carbon chain of nonane is connected to one benzene ring in the diphenylamine structure. Then, undecene amide is added, and a long-chain amide matrix is ​​connected to another benzene ring in the diphenylamine structure to prepare an intermediate. The reaction process is as follows:

[0011]

[0012] Step S2, adding 4-bromo-2,6-di-tert-butylphenol and the intermediate into a reaction kettle filled with toluene, heating to 65-70° C. at a speed of 250-300 r / min, adding potassium carbonate, and keeping the temperature for reaction for 6-8 hours to obtain a modifier.

[0013] In step S2, toluene is used as a solvent, potassium carbonate is used as a catalyst, and the bromine on 4-bromo-2,6-di-tert-butylphenol reacts with the imino group on the intermediate to prepare a modifier. The reaction process is as follows:

[0014]

[0015] The modifier prepared by the present invention has a hydrophobic long carbon chain at one end and a long chain with a high polarity amide at the other end in terms of structure. When the modifier is added to a stretching lubricant component, the high polarity end of the molecule has a strong affinity for the metal surface and can be adsorbed on the metal surface, while its non-polar carbon chain extends into the base oil. In this way, the modifier molecules are arranged in a direction on the metal surface to form a molecular film to protect the metal substrate and prevent it from being scratched. In addition, a di-tert-butylphenol structure is introduced into the structure of the present invention. The structure has antioxidant properties and can give the modifier an antioxidant function. However, the antioxidant of the di-tert-butylphenol type has poor heat resistance, and the local high temperature of the metal material of the battery shell during stretching will cause the antioxidant function in the stretching lubricant to be lost. Therefore, the modifier prepared by the present invention introduces multiple benzene rings, which can improve the heat resistance of the modifier and improve the high temperature resistance.

[0016] Furthermore: the base oil is a Class III base oil or a Class IV base oil.

[0017] Furthermore, the polyol ester is a mixture of one or both of pentaerythritol ester and propylene glycol octanol decanoate in any proportion.

[0018] Furthermore, the polyphosphate ester is a mixture of one or more of di-n-butyl phosphite, triphenyl thiophosphate and tricresyl phosphate in any proportion.

[0019] Furthermore: the dispersant is a mixture of one or both of monosuccinimide and bissuccinimide in any proportion.

[0020] Furthermore, in step S1, the molar ratio of diphenylamine, nonene and undecene amide is controlled to be 2:1:1, the amount of the catalyst is 3-5% by weight of diphenylamine, and in step S2, the amount ratio of 4-bromo-2,6-di-tert-butylphenol, intermediate, potassium carbonate and toluene is controlled to be 1 mmol:1 mmol:1 mmol:40-50 mL.

[0021] Furthermore: the catalyst in step S1 is activated clay dried at 100° C. for 2 hours.

[0022] A method for preparing a stretching lubricant for a battery casing comprises the following steps:

[0023] The raw materials of various components are mixed and stirred evenly to prepare the stretching lubricating oil for battery shell.

[0024] Beneficial effects of the present invention:

[0025] The invention prepares a stretching lubricant for battery shell, which adopts Class III base oil or Class IV base oil as a base, and the added polyol ester has good effects on wear reduction, temperature reduction and lubrication; dearomatization makes the workpiece easy to dissipate heat and easy to clean during the stretching process, and is non-toxic and odorless; the composite phosphate has good anti-wear performance and flame retardant effect, and the added modifier has a hydrophobic long carbon chain at one end and a long chain with a high polarity amide at the other end. When the modifier is added to the stretching lubricant component, the high polarity end of the molecule has a strong affinity to the metal surface and can be adsorbed on the metal surface, while its non-polar carbon The chain extends into the base oil. In this way, the modifier molecules are arranged in a directional manner on the metal surface to form a molecular film, which improves the lubrication performance and protects the metal substrate to prevent strain. In addition, the di-tert-butylphenol structure is introduced into the structure of the present invention. The structure has antioxidant properties and can give the modifier an antioxidant function. However, the di-tert-butylphenol antioxidant has poor heat resistance, and the local high temperature of the metal material of the battery shell during stretching will cause the antioxidant function in the stretching lubricant to be lost. Therefore, the modifier prepared by the present invention introduces multiple benzene rings, which can improve the heat resistance of the modifier and improve the high temperature resistance. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] A stretching lubricant for a battery casing, comprising the following raw materials in weight percentage: 50% base oil, 2.5% modifier, 25% polyol ester, 3% polyphosphate ester, 10% dearomatization, and the balance is a dispersant;

[0029] The battery casing is made of stretching lubricant including the following steps:

[0030] The raw materials of various components are mixed and stirred evenly to prepare the stretching lubricating oil for battery shell.

[0031] The base oil is a Class III base oil.

[0032] The polyol ester is pentaerythritol ester.

[0033] The polyphosphate ester is di-n-butyl phosphite.

[0034] The dispersant is monosuccinimide.

[0035] The modifier comprises the following steps:

[0036] Step S1, adding diphenylamine and a catalyst into a four-necked flask, stirring at a uniform speed and adding nonene, heating to 170° C. under a nitrogen atmosphere, stirring at a uniform speed and keeping the temperature for 4 hours, adding undecene amide after the reaction, stirring at a uniform speed and keeping the temperature for 4 hours, filtering the obtained reaction solution while hot, and distilling under reduced pressure to obtain an intermediate, controlling the molar ratio of diphenylamine, nonene and undecene amide to be 2:1:1, and the amount of the catalyst to be used is 3% of the weight of diphenylamine;

[0037] The catalyst is activated clay dried at 100° C. for 2 hours.

[0038] Step S2, adding 4-bromo-2,6-di-tert-butylphenol and the intermediate into a reaction kettle filled with toluene, heating to 65°C at a speed of 250 r / min, adding potassium carbonate, and keeping the temperature for reaction for 6 hours to obtain a modifier, wherein the amount ratio of 4-bromo-2,6-di-tert-butylphenol, the intermediate, potassium carbonate and toluene is controlled to be 1 mmol: 1 mmol: 1 mmol: 40 mL.

[0039] Example 2

[0040] A stretching lubricant for a battery casing, comprising the following raw materials in weight percentage: 52% base oil, 3.5% modifier, 23% polyol ester, 7% polyphosphate ester, 10% dearomatization, and the balance is a dispersant;

[0041] The battery casing is made of stretching lubricant including the following steps:

[0042] The raw materials of various components are mixed and stirred evenly to prepare the stretching lubricating oil for battery shell.

[0043] The base oil is a Class III base oil.

[0044] The polyol ester is pentaerythritol ester.

[0045] The polyphosphate ester is triphenyl thiophosphate.

[0046] The dispersant is monosuccinimide.

[0047] The modifier comprises the following steps:

[0048] Step S1, adding diphenylamine and a catalyst into a four-necked flask, stirring at a uniform speed and adding nonene, heating to 170° C. under a nitrogen atmosphere, stirring at a uniform speed and keeping the temperature for 4 hours, adding undecene amide after the reaction, stirring at a uniform speed and keeping the temperature for 4 hours, filtering the obtained reaction solution while hot, and distilling under reduced pressure to obtain an intermediate, controlling the molar ratio of diphenylamine, nonene and undecene amide to be 2:1:1, and the amount of the catalyst to be used is 3.5% of the weight of diphenylamine;

[0049] The catalyst is activated clay dried at 100° C. for 2 hours.

[0050] Step S2, adding 4-bromo-2,6-di-tert-butylphenol and the intermediate into a reaction kettle filled with toluene, heating to 65-70°C at a speed of 280 r / min, adding potassium carbonate, and keeping the temperature for reaction for 7 hours to obtain a modifier, wherein the amount ratio of 4-bromo-2,6-di-tert-butylphenol, the intermediate, potassium carbonate and toluene is controlled to be 1 mmol: 1 mmol: 1 mmol: 45 mL.

[0051] Example 3

[0052] A stretching lubricant for a battery casing, comprising the following raw materials in weight percentage: 55% base oil, 4% modifier, 23% polyol ester, 5% polyphosphate ester, 6% dearomatization, and the balance is a dispersant;

[0053] The battery casing is made of stretching lubricant including the following steps:

[0054] The raw materials of various components are mixed and stirred evenly to prepare the stretching lubricating oil for battery shell.

[0055] The base oil is a Class 4 base oil.

[0056] The polyol ester is propylene glycol octanoate.

[0057] The polyphosphate ester is tricresyl phosphate.

[0058] The dispersant is bis-succinimide.

[0059] The modifier comprises the following steps:

[0060] Step S1, adding diphenylamine and a catalyst into a four-necked flask, stirring at a uniform speed and adding nonene, heating to 170° C. under a nitrogen atmosphere, stirring at a uniform speed and keeping the temperature for 4 hours, adding undecene amide after the reaction, stirring at a uniform speed and keeping the temperature for 4 hours, filtering the obtained reaction solution while hot, and distilling under reduced pressure to obtain an intermediate, controlling the molar ratio of diphenylamine, nonene and undecene amide to be 2:1:1, and the amount of the catalyst to be used is 4.5% of the weight of diphenylamine;

[0061] The catalyst is activated clay dried at 100° C. for 2 hours.

[0062] Step S2, adding 4-bromo-2,6-di-tert-butylphenol and the intermediate into a reaction kettle filled with toluene, heating to 70°C at a speed of 300 r / min, adding potassium carbonate, and keeping the temperature for reaction for 8 hours to obtain a modifier, wherein the amount ratio of 4-bromo-2,6-di-tert-butylphenol, the intermediate, potassium carbonate and toluene is controlled to be 1 mmol: 1 mmol: 1 mmol: 48 mL.

[0063] Example 4

[0064] A stretching lubricant for a battery casing, comprising the following raw materials in weight percentage: 60% base oil, 6.5% modifier, 20% polyol ester, 3% polyphosphate ester, 5% dearomatization, and the balance is a dispersant;

[0065] The battery casing is made of stretching lubricant including the following steps:

[0066] The raw materials of various components are mixed and stirred evenly to prepare the stretching lubricating oil for battery shell.

[0067] The base oil is a Class 4 base oil.

[0068] The polyol ester is propylene glycol octanoate.

[0069] The polyphosphate ester is tricresyl phosphate.

[0070] The dispersant is mono-bis-succinimide.

[0071] The modifier comprises the following steps:

[0072] Step S1, adding diphenylamine and a catalyst into a four-necked flask, stirring at a uniform speed and adding nonene, heating to 170° C. under a nitrogen atmosphere, stirring at a uniform speed and keeping the temperature for 4 hours, adding undecene amide after the reaction, stirring at a uniform speed and keeping the temperature for 4 hours, filtering the obtained reaction solution while hot, and distilling under reduced pressure to obtain an intermediate, controlling the molar ratio of diphenylamine, nonene and undecene amide to be 2:1:1, and the amount of the catalyst to be used is 5% of the weight of diphenylamine;

[0073] The catalyst is activated clay dried at 100° C. for 2 hours.

[0074] Step S2, adding 4-bromo-2,6-di-tert-butylphenol and the intermediate into a reaction kettle filled with toluene, heating to 70°C at a speed of 300 r / min, adding potassium carbonate, and keeping the temperature for reaction for 8 hours to obtain a modifier, wherein the amount ratio of 4-bromo-2,6-di-tert-butylphenol, the intermediate, potassium carbonate and toluene is controlled to be 1 mmol: 1 mmol: 1 mmol: 50 mL.

[0075] Comparative Example 1

[0076] Compared with Example 1, no modifier was added in this comparative example.

[0077] Comparative Example 2

[0078] This comparative example is a metal stretching lubricant produced by a certain company on the market.

[0079] The lubricating properties of the stretching lubricants prepared in Examples 1-4 and Comparative Examples 1-2 were tested, and the results are shown in Table 1 below:

[0080] Lubricity: GB / T 12583 method is used to test the P of the stretching oil. B Maximum no-seizure load, P D The sintering load characterizes the lubricity of the oil.

[0081] Table 1

[0082] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 <![CDATA[P B (N)]]> 1025 1028 1030 1031 865 931 <![CDATA[P D (N)]]> 3152 3156 3157 3158 2402 2780

[0083] It can be seen from Table 1 above that the stretching lubricants prepared in Examples 1-4 of the present invention have excellent lubricating properties.

[0084] The antioxidant properties of the stretching lubricants prepared in Examples 1-4 and Comparative Examples 1-2 were tested using a SH / T0193 rotating oxygen bomb measuring instrument at a high temperature of more than 150° C. The results are shown in Table 2 below:

[0085] Table 2

[0086]

[0087] It can be seen from Table 2 above that the stretching lubricants prepared in Examples 1-4 of the present invention have excellent high-temperature antioxidant properties.

[0088] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A stretching lubricant for a battery casing, characterized in that: The raw materials include the following weight percentages: 50%-60% base oil, 2.5%-6.5% modifier, 20%-25% polyol ester, 3%-8% polyphosphate ester, 5%-10% dearomatization, and the balance is dispersant; The modifier comprises the following steps: Step S1, adding diphenylamine and a catalyst into a four-necked flask, stirring at a uniform speed and adding nonene, heating to 170° C. under a nitrogen atmosphere, stirring at a uniform speed and keeping the temperature for 4 hours, adding undecylenamide after the reaction, stirring at a uniform speed and keeping the temperature for 4 hours, after the reaction, filtering the obtained reaction solution while hot, and distilling under reduced pressure to obtain an intermediate; Step S2, adding 4-bromo-2,6-di-tert-butylphenol and the intermediate into a reaction kettle filled with toluene, heating to 65-70° C. at a speed of 250-300 r / min, adding potassium carbonate, and keeping the temperature for reaction for 6-8 hours to obtain a modifier; The catalyst in step S1 is activated clay dried at 100° C. for 2 hours.

2. The stretching lubricant for battery casing according to claim 1, characterized in that: The base oil is a Class III base oil or a Class IV base oil.

3. The stretching lubricant for battery casing according to claim 1, characterized in that: The polyol ester is a mixture of one or both of pentaerythritol ester and propylene glycol octanoate and decanoate in any proportion.

4. The stretching lubricant for battery casing according to claim 1, characterized in that: The polyphosphate ester is a mixture of one or more of di-n-butyl phosphite, triphenyl thiophosphate and tricresyl phosphate in any proportion.

5. The stretching lubricant for battery casing according to claim 1, characterized in that: The dispersant is a mixture of one or both of monosuccinimide and bissuccinimide in any proportion.

6. The stretching lubricant for battery casing according to claim 1, characterized in that: In step S1, the molar ratio of diphenylamine, nonene and undecene amide is controlled to be 2:1:1, and the amount of catalyst used is 3-5% of the weight of diphenylamine. In step S2, the amount ratio of 4-bromo-2,6-di-tert-butylphenol, intermediate, potassium carbonate and toluene is controlled to be 1mmol:1mmol:1mmol:40-50mL.

7. The method for preparing a stretching lubricant for a battery casing according to claim 1, characterized in that: The steps include: The raw materials of various components are mixed and stirred evenly to prepare the stretching lubricating oil for battery shell.

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