Bacteriostatic high-temperature-resistant lubricating oil and preparation method thereof

Abstract

The invention discloses antibacterial high-temperature-resistant lubricating oil and a preparation method thereof, and belongs to the technical field of lubricating oil. The lubricating oil is prepared by taking base oil and a bacteriostatic agent as raw materials. The bacteriostatic agent is a modified cyclodextrin / MOF composite material ASA-gamma-CD / Ag / Zn-BTC, and the modified cyclodextrin can improve the lipophilicity of the bacteriostatic agent and promote the uniform dispersion of the bacteriostatic agent in the lubricating oil, so that a better bacteriostatic effect is achieved; the bacteriostatic agent can utilize the double bactericidal effects of Ag and Zn-O structures, and also can realize adsorption and chelation of biological strains through an MOF structure, so that chemical and physical compound bacteriostasis is realized; meanwhile, the MOF structure in the material has a high specific surface area, oxygen molecules in the lubricating oil can be effectively adsorbed, the anti-oxidation effect is achieved, then the lubricating oil can be prevented from being subjected to an oxidation reaction under the high-temperature condition, and the lubricating oil has the excellent high-temperature-resistant performance. The prepared lubricating oil has excellent antibacterial and high-temperature-resistant performance, the preparation process is simple, and the lubricating oil has wide application potential.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating oils, and in particular to an antibacterial and high temperature resistant lubricating oil and a preparation method thereof. Background Art

[0002] In the current chemical, textile and machinery industries, the application of lubricants is extremely common and important. With the deepening of global economic integration, the automotive industry in particular is experiencing unprecedented rapid growth, coupled with the increasing demand for environmental protection and energy efficiency improvement, although the overall supply of lubricants has not increased significantly, the market's thirst for high-quality lubricants is increasing day by day. From the perspective of technical composition, lubricants are mainly composed of two key components: base oil and additives. Among them, base oil, as the core component, accounts for more than 85%, which plays a decisive role in the performance of lubricants.

[0003] The base oil category of lubricating oil can be subdivided into vegetable oil, mineral oil and synthetic oil. Among them, vegetable oil, due to its unique biodegradability, shows a lower potential for environmental pollution compared to mineral oil and most synthetic oils, an advantage that the latter two do not have. In view of the high standards of environmental protection put forward by the current society, this environmental protection characteristic of vegetable oil just meets the needs of this era. Although the production cost of vegetable oil is relatively high, its characteristic of significantly reducing environmental pollution effectively reduces the investment demand for subsequent environmental governance, thus opening up a broad market application prospect for it.

[0004] However, the existing vegetable oil-based lubricants have poor antibacterial properties and high temperature resistance, which limits the scope of use of vegetable oil-based lubricants and prevents them from being applied on a large scale. Summary of the invention

[0005] In order to solve the problems existing in the current vegetable oil-based lubricants, the present invention provides a vegetable oil-based lubricant with excellent antibacterial and high temperature resistance properties, which is suitable for application in various fields.

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

[0007] An antibacterial and high temperature resistant lubricating oil, characterized by comprising the following raw materials in parts by weight:

[0008] Base oil: 45-65 parts,

[0009] Antibacterial agent: 5-7 parts;

[0010] Furthermore, the antibacterial agent is a modified cyclodextrin / MOF composite material ASA-γ-CD / Ag / Zn-BTC.

[0011] Furthermore, the base oil is at least one of corn oil, castor oil and soybean oil.

[0012] Another object of the present invention is achieved by the following technical solution: a method for preparing an antibacterial and high temperature resistant lubricating oil, comprising the following steps:

[0013] S1. Preparation of modified cyclodextrin ASA-γ-CD: stirring and dispersing γ-CD in water, and then adjusting the pH of the solution to 8-9 with a NaOH solution to obtain a dispersion; adding an alkenyl succinic anhydride compound to the dispersion, reacting for 2-3 hours to obtain a reaction solution, and adjusting the pH of the reaction solution to 6-6.5 with a hydrochloric acid solution; then washing with n-hexane / isopropanol in a volume ratio of 3:1, and drying to obtain ASA-γ-CD;

[0014] S2. Preparation of modified cyclodextrin / MOF composite material ASA-γ-CD / Ag / Zn-BTC: dissolving zinc nitrate hexahydrate in N,N-dimethylformamide to obtain solution 1; dissolving trimesic acid in N,N-dimethylformamide to obtain solution 2; dissolving ASA-γ-CD in N,N-dimethylformamide to obtain solution 3; mixing solution 1, solution 2 and solution 3, adding silver nitrate solution, heating to 120-130°C and reacting for 8-10 hours; after the reaction, washing with N,N-dimethylformamide solvent, filtering and drying to obtain ASA-γ-CD / Ag / Zn-BTC;

[0015] S3, preparing lubricating oil initial mixed liquid: adding base oil by weight, heating to 80-90° C. under stirring, keeping warm and stirring for 1-3 hours to obtain lubricating oil initial mixed liquid;

[0016] S4. Preparation of lubricating oil: Cool the initial mixed liquid of lubricating oil to 60-65°C, add ASA-γ-CD / Ag / Zn-BTC by weight while stirring, stir at a constant temperature of 60-65°C for 10-12h, cool to room temperature, and filter to obtain lubricating oil.

[0017] Furthermore, in step S1, the concentration of the NaOH solution is 0.75 mol / L, and the concentration of the hydrochloric acid solution is 0.1 mol / L.

[0018] Furthermore, the alkenyl succinic anhydride compound in step S1 is one of octadecenyl succinic anhydride, dodecenyl succinic anhydride, and n-octenyl succinic anhydride.

[0019] Furthermore, in step S1, the usage ratio of the alkenyl succinic anhydride compound to γ-CD is 0.6-1 g:20 g.

[0020] Furthermore, the concentration of the silver nitrate solution in step S2 is 0.6 mol / L.

[0021] Furthermore, in step S2, the usage ratio of the silver nitrate solution, zinc nitrate hexahydrate, trimesic acid and modified γ-CD is 100 mL: 7 g: 5 g: 3 g.

[0022] Beneficial effects of the present invention:

[0023] (1) The lubricating oil prepared by the present invention overcomes the shortcomings of the prior art and has excellent antibacterial and high temperature resistance properties.

[0024] (2) The antibacterial agent prepared by the present invention is ASA-γ-CD / Ag / Zn-BTC. When the material is used as an antibacterial agent, the modified cyclodextrin can improve the lipophilicity of the antibacterial agent and promote the uniform dispersion of the antibacterial agent in the lubricating oil, thereby achieving a better antibacterial effect and making the lubricating oil have excellent antibacterial properties.

[0025] (3) The antibacterial agent prepared by the present invention is ASA-γ-CD / Ag / Zn-BTC. When used as an antibacterial agent, the material can utilize the dual bactericidal effects of the Ag and Zn-O structures, and can also achieve adsorption and chelation of biological species through the MOF structure, thereby achieving chemical and physical composite antibacterial properties, thereby making the lubricant have excellent antibacterial properties.

[0026] (3) The MOF structure in the antibacterial agent ASA-γ-CD / Ag / Zn-BTC prepared by the present invention has a high specific surface area, which can effectively adsorb oxygen molecules in the lubricating oil and play an antioxidant effect, thereby resisting the oxidation reaction of the lubricating oil under high temperature conditions, so that the lubricating oil has good high temperature resistance. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0028] Example 1

[0029] This embodiment provides an antibacterial and high temperature resistant lubricating oil, characterized by comprising the following raw materials in parts by weight:

[0030] Corn oil: 30 parts,

[0031] Castor oil: 10 parts,

[0032] Soybean oil: 5 parts,

[0033] Antibacterial agent: 5 parts.

[0034] The antibacterial agent is a modified cyclodextrin / MOF composite material ASA-γ-CD / Ag / Zn-BTC.

[0035] A method for preparing an antibacterial and high temperature resistant lubricating oil comprises the following steps:

[0036] S1. Preparation of modified cyclodextrin ASA-γ-CD: 20 g of γ-CD was dispersed in 100 mL of water by stirring, and then the pH was adjusted to 9 with a 0.1 mol / L NaOH solution to obtain a dispersion; 1 g of octadecenylsuccinic anhydride was added to the dispersion, and the reaction was carried out for 3 h to obtain a reaction solution; the pH of the reaction solution was adjusted to 6 with a 0.1 mol / L hydrochloric acid solution; and then the reaction solution was washed with n-hexane / isopropanol in a volume ratio of 3:1 and dried to obtain ASA-γ-CD;

[0037] S2. Preparation of modified cyclodextrin / MOF composite material ASA-γ-CD / Ag / Zn-BTC: dissolve 7g zinc nitrate hexahydrate in 100mL N,N-dimethylformamide to obtain solution 1; dissolve 5g trimesic acid in 100mL N,N-dimethylformamide to obtain solution 2; dissolve 3g ASA-γ-CD in N,N-dimethylformamide to obtain solution 3; mix solution 1, solution 2 and solution 3, add 100mL 0.6mol / L silver nitrate solution, heat to 130℃ and react for 10h; after the reaction, wash with N,N-dimethylformamide solvent, filter and dry to obtain ASA-γ-CD / Ag / Zn-BTC;

[0038] S3, preparing lubricating oil initial mixed liquid: adding corn oil, castor oil and soybean oil according to weight parts, heating to 90° C. under stirring, and dissolving under magnetic stirring for 3 hours to obtain lubricating oil initial mixed liquid;

[0039] S4. Preparation of lubricating oil: Cool the initial mixed liquid of lubricating oil to 60° C., add ASA-γ-CD / Ag / Zn-BTC by weight while stirring, stir at a constant temperature of 60° C. for 12 h, cool to room temperature, and filter to obtain lubricating oil.

[0040] Example 2

[0041] Compared with Example 1, the difference between this example and Example 1 is that the raw materials are changed to include the following raw materials in parts by weight:

[0042] Corn oil: 35 parts,

[0043] Castor oil: 12 parts,

[0044] Soybean oil: 7 parts,

[0045] Antibacterial agent: 6 parts; the remaining raw materials and preparation process are the same as those in Example 1.

[0046] Example 3

[0047] Compared with Example 1, the difference between this example and Example 1 is that the raw materials are changed to include the following raw materials in parts by weight:

[0048] Corn oil: 40 parts,

[0049] Castor oil: 15 parts,

[0050] Soybean oil: 10 parts,

[0051] Antibacterial agent: 7 parts; the remaining raw materials and preparation process are the same as those in Example 1.

[0052] Example 4

[0053] The difference between this embodiment and embodiment 1 is that "1 g of octadecenylsuccinic anhydride" in step S1 is changed to "0.8 g of dodecenylsuccinic anhydride"; the other raw materials and preparation process remain the same as those in embodiment 1.

[0054] Example 5

[0055] Compared with Example 1, the difference between this example is that "1 g of octadecene succinic anhydride" in step S1 is changed to "0.6 g of n-octenyl succinic anhydride"; the other raw materials and preparation process remain the same as those in Example 1.

[0056] Comparative Example 1

[0057] Compared with Example 1, the difference between this comparative example and Example 1 is that γ-CD / Ag / Zn-BTC is prepared as an antibacterial agent for lubricating oil. The preparation of lubricating oil includes the following steps:

[0058] S1. Preparation of cyclodextrin / MOF composite material γ-CD / Ag / Zn-BTC: dissolve 7g zinc nitrate hexahydrate in 100mL N,N-dimethylformamide to obtain solution 1; dissolve 5g trimesic acid in 100mL N,N-dimethylformamide to obtain solution 2; dissolve 3g γ-CD in N,N-dimethylformamide to obtain solution 3; mix solution 1, solution 2 and solution 3, add 100mL 0.6mol / L silver nitrate solution, heat to 130℃ and react for 10h; after the reaction, wash with N,N-dimethylformamide solvent, filter and dry to obtain γ-CD / Ag / Zn-BTC;

[0059] S2. Preparing a lubricating oil initial mixed solution: adding corn oil, castor oil, and soybean oil in parts by weight, heating to 90° C. with stirring, and dissolving under magnetic stirring for 3 hours to obtain a lubricating oil initial mixed solution;

[0060] S3, preparing lubricating oil: cooling the initial mixed liquid of lubricating oil to 60°C, adding γ-CD / Ag / Zn-BTC by weight under stirring, stirring at a constant temperature of 60°C for 12 hours, cooling to room temperature, filtering to obtain lubricating oil;

[0061] The remaining raw materials and preparation process remain the same as in Example 1.

[0062] Comparative Example 2

[0063] Compared with Example 1, this comparative example is different in that Ag / Zn-BTC is prepared as an antibacterial agent for lubricating oil, and the preparation method of lubricating oil comprises the following steps:

[0064] S1. Preparation of MOF composite material Ag / Zn-BTC: dissolve 7g zinc nitrate hexahydrate in 100mL N,N-dimethylformamide to obtain solution 1; dissolve 5g trimesic acid in 100mL N,N-dimethylformamide to obtain solution 2; mix solution 1 and solution 2, add 100mL 0.6mol / L silver nitrate solution, heat to 130℃ and react for 10h; after the reaction, wash with N,N-dimethylformamide solvent, filter and dry to obtain Ag / Zn-BTC;

[0065] S2. Preparing a lubricating oil initial mixed solution: adding corn oil, castor oil, and soybean oil in parts by weight, heating to 90° C. with stirring, and dissolving under magnetic stirring for 3 hours to obtain a lubricating oil initial mixed solution;

[0066] S3, preparing lubricating oil: cooling the initial mixed liquid of lubricating oil to 60°C, adding Ag / Zn-BTC by weight under stirring, stirring at a constant temperature of 60°C for 12 hours, cooling to room temperature, filtering to obtain lubricating oil;

[0067] The remaining raw materials and preparation process remain the same as in Example 1.

[0068] Comparative Example 3

[0069] Compared with Example 1, this comparative example is different in that ASA-γ-CD / Zn-BTC is prepared as an antibacterial agent for lubricating oil, and the preparation method of lubricating oil comprises the following steps:

[0070] S1. Preparation of modified cyclodextrin ASA-γ-CD: 20 g of γ-CD was dispersed in 100 mL of water by stirring, and then the pH was adjusted to 9 with a 0.1 mol / L NaOH solution to obtain a dispersion; 1 g of octadecenylsuccinic anhydride was added to the dispersion, and the reaction was carried out for 3 h to obtain a reaction solution; the pH of the reaction solution was adjusted to 6 with a 0.1 mol / L hydrochloric acid solution; and then the reaction solution was washed with n-hexane / isopropanol in a volume ratio of 3:1 and dried to obtain ASA-γ-CD;

[0071] S2. Preparation of modified cyclodextrin / MOF composite material ASA-γ-CD / Zn-BTC: dissolving 7 g zinc nitrate hexahydrate in 100 mL N, N-dimethylformamide to obtain solution 1; dissolving 5 g trimesic acid in 100 mL N, N-dimethylformamide to obtain solution 2; dissolving 3 g ASA-γ-CD in N, N-dimethylformamide to obtain solution 3; mixing solution 1, solution 2 and solution 3, heating to 130°C and reacting for 10 h; after the reaction, washing with N, N-dimethylformamide solvent, filtering and drying to obtain ASA-γ-CD / Zn-BTC;

[0072] S3, preparing lubricating oil initial mixed liquid: adding corn oil, castor oil and soybean oil according to weight parts, heating to 90° C. under stirring, and dissolving under magnetic stirring for 3 hours to obtain lubricating oil initial mixed liquid;

[0073] S4, preparing lubricating oil: cooling the initial mixed liquid of lubricating oil to 60°C, adding ASA-γ-CD / Zn-BTC by weight under stirring, stirring at a constant temperature of 60°C for 12 hours, cooling to room temperature, filtering to obtain lubricating oil;

[0074] The remaining raw materials and preparation process remain the same as in Example 1.

[0075] Comparative Example 4

[0076] Compared with Example 1, the difference between this comparative example and Example 1 is that nano silver particles are used as the antibacterial agent of the lubricating oil. The preparation method of the lubricating oil comprises the following steps:

[0077] S1. Preparing a lubricating oil initial mixed liquid: adding corn oil, castor oil and soybean oil in parts by weight into a reaction kettle, heating to 90° C. under stirring, and dissolving under magnetic stirring for 3 hours to obtain a lubricating oil initial mixed liquid;

[0078] S2, preparing lubricating oil: cooling the initial mixed liquid of lubricating oil to 60° C., adding nanosilver particles by weight under magnetic stirring, stirring at a constant temperature of 60° C. for 12 h, cooling to room temperature, and filtering to obtain lubricating oil;

[0079] The remaining raw materials and preparation process remain the same as in Example 1.

[0080] The lubricating oils prepared in the above-mentioned Examples 1 to 5 and Comparative Examples 1 to 4 were subjected to performance tests; the total number of microorganisms per unit volume of the lubricating oil was measured, and the effect of the biostability of the lubricating oil, that is, the strength of the antibacterial performance, was determined by the difference in the total number of microorganisms in the lubricating oil. When the total number of microorganisms reached 10 6When the lubricant has a constant sliding speed of 18.8 mm / s and a normal load of 40 N, the friction coefficient of the lubricant at different times is measured in a wear test at a constant sliding speed of 18.8 mm / s and a normal load of 40 N, and the results are shown in Table 3;

[0081] Table 1

[0082] Biological stability test (pieces / mL) 30 days 45 days 60 days 75 days 90 days Example 1 <![CDATA[6.0*10 2 ]]> <![CDATA[6.0*10 3 ]]> <![CDATA[2.0*10 4 ]]> <![CDATA[7.0*10 4 ]]> <![CDATA[4.0*10 5 ]]> Example 2 <![CDATA[6.0*10 2 ]]> <![CDATA[5.9*10 3 ]]> <![CDATA[2.1*10 4 ]]> <![CDATA[6.9*10 4 ]]> <![CDATA[3.9*10 5 ]]> Example 3 <![CDATA[6.1*10 2 ]]> <![CDATA[6.2*10 3 ]]> <![CDATA[2.0*10 4 ]]> <![CDATA[7.0*10 4 ]]> <![CDATA[3.9*10 5 ]]> Example 4 <![CDATA[6.4*10 2 ]]> <![CDATA[6.5*10 3 ]]> <![CDATA[2.3*10 4 ]]> <![CDATA[7.2*10 4 ]]> <![CDATA[4.3*10 5 ]]> Example 5 <![CDATA[6.8*10 2 ]]> <![CDATA[6.7*10 3 ]]> <![CDATA[2.6*10 4 ]]> <![CDATA[7.5*10 4 ]]> <![CDATA[4.6*10 5 ]]> Comparative Example 1 <![CDATA[9.0*10 2 ]]> <![CDATA[9.0*10 3 ]]> <![CDATA[6.0*10 4 ]]> <![CDATA[2.0*10 5 ]]> <![CDATA[8.0*10 5 ]]> Comparative Example 2 <![CDATA[8.0*10 2 ]]> <![CDATA[8.0*10 3 ]]> <![CDATA[5.0*10 4 ]]> <![CDATA[1.0*10 5 ]]> <![CDATA[7.0*10 5 ]]> Comparative Example 3 <![CDATA[6.0*10 3 ]]> <![CDATA[7.0*10 4 ]]> <![CDATA[2.0*10 6 ]]> - - Comparative Example 4 <![CDATA[2*10 2 ]]> <![CDATA[3.0*10 4 ]]> <![CDATA[2.0*10 6 ]]> - -

[0083] Table 2

[0084]

[0085]

[0086] Table 3

[0087] Friction coefficient test 500s 1000s 1500s Example 1 0.061 0.063 0.064 Example 2 0.062 0.063 0.066 Example 3 0.061 0.062 0.064 Example 4 0.063 0.064 0.067 Example 5 0.066 0.068 0.069 Comparative Example 1 0.091 0.093 0.096 Comparative Example 2 0.089 0.090 0.091 Comparative Example 3 0.078 0.080 0.081 Comparative Example 4 0.110 0.114 0.117

[0088] It can be seen from Table 1 that the modified cyclodextrin / MOF composite material ASA-γ-CD / Ag / Zn-BTC in Examples 1 to 5 has excellent antibacterial performance when used as an antibacterial agent. Compared with Examples 1, 4 and 5, the antibacterial agent prepared by modifying cyclodextrin with octadecene succinic anhydride has a better antibacterial effect than the antibacterial agent modified with dodecene succinic anhydride and n-octenyl succinic anhydride. The reason is that under alkaline conditions, the carboxylic anhydride group of succinic anhydride can react with γ-C The hydroxyl group of D undergoes an esterification reaction, thereby grafting the long-chain alkyl group of succinic anhydride onto γ-CD. This grafting reaction not only retains the original cavity structure of γ-CD, but also introduces the hydrophobic long chain of succinic anhydride onto its outer surface, which significantly improves the hydrophobicity of γ-CD, thereby improving its lipophilicity. Because octadecene succinic anhydride has a longer long-chain alkyl group, it can perform a higher degree of hydrophobic modification on cyclodextrin, and the obtained antibacterial agent also has better lipophilicity, which can achieve a better antibacterial effect.

[0089] The antibacterial agent obtained by not hydrophobically modifying cyclodextrin in Comparative Example 1 has a poorer antibacterial effect than Example 1, because cyclodextrin has good hydrophilicity, and direct use will hinder the uniform dispersion of the antibacterial agent in the lubricating oil, thereby causing the antibacterial effect of the antibacterial agent to deteriorate; Compared with Example 1, the antibacterial effect of Comparative Example 2 is also poor, indicating that the addition of modified cyclodextrin can improve the lipophilicity of the antibacterial agent, thereby achieving a better antibacterial effect; Compared with Example 1, the antibacterial effect of Comparative Example 3 is also poor, because although the Zn-O structure in the simple MOF material has certain bactericidal properties, its bactericidal effect is weak and can only maintain a short period of bactericidal effect; Compared with Example 1, Comparative Example 4 shows that the nanosilver particles can have a good bactericidal effect in the early stage, but they are easy to aggregate, and it is difficult to inhibit the growth of microorganisms in 60 days, and can only maintain a short period of bactericidal effect. Limited by its dispersibility, it is easy to agglomerate and cannot exert a long-term bactericidal effect.

[0090] Therefore, when ASA-γ-CD / Ag / Zn-BTC is used as an antibacterial agent, the modified cyclodextrin can improve the lipophilicity of the antibacterial agent and promote the uniform dispersion of the antibacterial agent in the lubricating oil, thereby achieving a better antibacterial effect; the antibacterial agent can also utilize the dual bactericidal effects of Ag and Zn-O structures, and can achieve adsorption and chelation of biological species through the MOF structure, realizing chemical and physical composite antibacterial effects, thereby making the lubricating oil have excellent antibacterial properties.

[0091] It can be seen from Table 2 that, compared with Examples 1 to 5 and Comparative Examples 1 to 4, when the antibacterial agents with MOF structures in Examples 1 to 5 and Comparative Examples 1 to 3 are used for lubricating oil, the lubricating oil has good thermal stability and can be stably used at 300°C. Because the MOF structure has a high specific surface area, it can effectively adsorb oxygen molecules in the lubricating oil and have an antioxidant effect, thereby resisting the oxidation reaction of the lubricating oil under high temperature conditions, so that the lubricating oil has good high temperature resistance.

[0092] It can be seen from Table 3 that, compared with Examples 1 to 5 and Comparative Examples 1 to 4, when the antibacterial agent with modified cyclodextrin in Examples 1 to 5 and Comparative Example 3 is used for lubricating oil, the modified cyclodextrin can improve the lipophilicity of the antibacterial agent and promote the uniform dispersion of the antibacterial agent in the lubricating oil, thereby improving the anti-wear property of the lubricating oil. However, when no modified cyclodextrin is used as the antibacterial agent in Comparative Example 2 and Comparative Example 4, the dispersibility of the antibacterial agent in the lubricating oil is poor, thereby having poor anti-wear property. The nanosilver in Comparative Example 3 is easy to agglomerate when used as an antibacterial agent, which is not conducive to improving the anti-wear property of the lubricating oil.

[0093] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0094] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An antibacterial and high temperature resistant lubricating oil, characterized in that: The invention comprises the following raw materials in parts by weight: Base oil: 45-65 parts, Antibacterial agent: 5-7 parts; The antibacterial agent is a modified cyclodextrin / MOF composite material ASA-γ-CD / Ag / Zn-BTC.

2. The antibacterial and high temperature resistant lubricating oil according to claim 1, characterized in that: The base oil is at least one of corn oil, castor oil and soybean oil.

3. The method for preparing an antibacterial and high temperature resistant lubricating oil according to any one of claims 1 to 2, characterized in that: The steps include: S1. Preparation of modified cyclodextrin ASA-γ-CD: stirring and dispersing γ-CD in water, and then adjusting the pH of the solution to 8-9 with a NaOH solution to obtain a dispersion; adding an alkenyl succinic anhydride compound to the dispersion, reacting for 2-3 hours to obtain a reaction solution, and adjusting the pH of the reaction solution to 6-6.5 with a hydrochloric acid solution; then washing with n-hexane / isopropanol in a volume ratio of 3:1, and drying to obtain ASA-γ-CD; S2. Preparation of modified cyclodextrin / MOF composite material ASA-γ-CD / Ag / Zn-BTC: dissolving zinc nitrate hexahydrate in N,N-dimethylformamide to obtain solution 1; dissolving trimesic acid in N,N-dimethylformamide to obtain solution 2; dissolving ASA-γ-CD in N,N-dimethylformamide to obtain solution 3; mixing solution 1, solution 2 and solution 3, adding silver nitrate solution, heating to 120-130°C and reacting for 8-10 hours; after the reaction, washing with N,N-dimethylformamide solvent, filtering and drying to obtain ASA-γ-CD / Ag / Zn-BTC; S3, preparing lubricating oil initial mixed liquid: adding base oil by weight, heating to 80-90° C. under stirring, keeping warm and stirring for 1-3 hours to obtain lubricating oil initial mixed liquid; S4. Preparation of lubricating oil: Cool the initial mixed liquid of lubricating oil to 60-65°C, add ASA-γ-CD / Ag / Zn-BTC by weight while stirring, stir at a constant temperature of 60-65°C for 10-12h, cool to room temperature, and filter to obtain lubricating oil.

4. The method for preparing an antibacterial and high temperature resistant lubricating oil according to claim 3, characterized in that: In step S1, the concentration of the NaOH solution is 0.75 mol / L, and the concentration of the hydrochloric acid solution is 0.1 mol / L.

5. The method for preparing an antibacterial and high temperature resistant lubricating oil according to claim 3, characterized in that: The alkenyl succinic anhydride compound in step S1 is one of octadecenyl succinic anhydride, dodecenyl succinic anhydride and n-octenyl succinic anhydride.

6. The method for preparing an antibacterial and high temperature resistant lubricating oil according to claim 3, characterized in that: In step S1, the usage ratio of the alkenyl succinic anhydride compound and γ-CD is 0.6-1 g:20 g.

7. The method for preparing an antibacterial and high temperature resistant lubricating oil according to claim 3, characterized in that: The concentration of the silver nitrate solution in step S2 is 0.6 mol / L.

8. The method for preparing an antibacterial and high temperature resistant lubricating oil according to claim 3, characterized in that: In step S2, the usage ratio of the silver nitrate solution, zinc nitrate hexahydrate, trimesic acid and modified γ-CD is 100 mL: 7 g: 5 g: 3 g.

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