Preparation method of green and environment-friendly conductive lubricant

Abstract

The invention belongs to the technical field of lubricants, and particularly relates to a preparation method of a green and environment-friendly conductive lubricant, which comprises the following steps: step 1, adding monostearic acid into vegetable oil, heating the mixture, and fully and continuously stirring; 2, cooling the mixture, adding the ionic liquid, and continuously stirring; and step 3, slowly cooling the mixture added with the ionic liquid to room temperature or refrigerating to-1 to 10 DEG C to obtain a target product, namely the conductive lubricant. The preparation method is simple, low in cost and suitable for large-scale production, and the lubricant has excellent viscoelasticity, thermal reversibility and creep resistance, remarkably reduces the friction coefficient and wear rate of a friction interface, effectively inhibits arc corrosion, still keeps stable performance after long-cycle friction, adapts to complex working conditions, and is suitable for large-scale production. A high-performance and sustainable alternative scheme is provided for a traditional lubricant, and meanwhile, a new thought is developed for the design of a multifunctional conductive lubricant in green engineering application.

Description

Technical Field

[0001] This invention belongs to the field of lubricant technology, specifically relating to a method for preparing a green and environmentally friendly conductive lubricant. Background Technology

[0002] The efficient operation of mechanical equipment relies on reliable lubrication, while friction and wear remain key factors limiting mechanical performance and extending service life. Especially in complex current-carrying tribological environments, current conduction at the friction interface exacerbates wear and triggers arc erosion, severely impacting equipment reliability and energy efficiency. Although traditional mineral oils and synthetic lubricants are widely used to reduce friction and wear in mechanical parts, their high energy consumption and environmental pollution during production and use are gradually limiting their application. Therefore, the development of conductive lubricants based on renewable resources, environmentally friendly materials, and with superior performance is crucial. Summary of the Invention

[0003] This invention discloses a method for preparing a green and environmentally friendly conductive lubricant, with the aim of solving the aforementioned problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: A method for preparing a green and environmentally friendly conductive lubricant includes the following steps: Step 1: Add monostearate to the vegetable oil, heat the mixture and stir continuously and thoroughly. Step 2: Then cool the mixture, add the ionic liquid and continue stirring; Step 3: Slowly cool the mixture with added ionic liquid to room temperature or refrigerate it to -1 to 10°C to obtain the target product, conductive lubricant.

[0005] Preferably, in step 1, the mass ratio of monostearate to vegetable oil is 20:80; the mixture is heated to 40-130°C and stirred continuously for no less than 10 minutes.

[0006] Preferably, in step 1, the vegetable oil refers to one or a mixture of several of the following: corn oil, soybean oil, palm oil, rapeseed oil, olive oil, sunflower oil, castor oil, and coconut oil.

[0007] Preferably, in step 2, the ionic liquid refers to one or a mixture of several of the following: 1-butyl-3-methylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-hexyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-octyl-3-methylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium acetate, 1-butylpyridine tetrafluoroborate, and 1-butyl-1-methylpyrrolidine bis(trifluoromethanesulfonyl)imide ([BMP][Tf2N]).

[0008] Preferably, in step 1, the vegetable oil refers to castor oil, and in step 2, the ionic liquid is 1-octyl-3-methylimidazolium hexafluorophosphate.

[0009] Preferably, in step 2, the mixture is cooled to 30-90°C, and the mass fraction of the ionic liquid is 1-20 parts.

[0010] The beneficial effects of the preparation method of the green and environmentally friendly conductive lubricant of the present invention are as follows: 1. Green and environmentally friendly with high performance: Based on vegetable oil, combined with glyceryl monostearate and ionic liquid, a green and environmentally friendly conductive gel lubricant is prepared, which has excellent viscoelasticity, thermal reversibility and anti-creep properties, effectively solving the problems of lubricating oil leakage and migration.

[0011] 2. Excellent tribological properties: It achieves an extremely low coefficient of friction, low wear rate, and low resistance at the friction interface, and significantly suppresses arc corrosion. It maintains stable performance even after long-term cyclic friction and has excellent resistance to load changes, current changes, and frequency changes, making it suitable for complex working conditions.

[0012] 3. Multiple synergistic mechanisms and broad application potential: Through multiple synergistic effects such as creep recovery, shear thinning, ion adsorption and friction protective film formation, the dynamic stability of the lubricating film and low contact resistance are ensured, providing a high-performance and sustainable lubrication solution for green engineering applications.

[0013] 4. The preparation method is simple and inexpensive, making it suitable for large-scale production. Attached Figure Description

[0014] Figure 1 This is a diagram of the conductive lubricant prepared according to the present invention.

[0015] Figure 2 The diagram shows the current-carrying tribological behavior of this conductive lubricant (in the diagram: Friction coefficient). Detailed Implementation

[0016] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0017] The following embodiments can be understood as illustrating a part of the structure or method of the present invention individually, or as combining the embodiments to explain the broader structure or method of the present invention.

[0018] Example 1: A method for preparing a green and environmentally friendly conductive lubricant includes the following steps: Step 1: Add monostearate to the vegetable oil, heat the mixture and stir continuously and thoroughly. Step 2: Then cool the mixture, add the ionic liquid and continue stirring; Step 3: Slowly cool the mixture with added ionic liquid to room temperature or refrigerate it to -1 to 10°C to obtain the target product, conductive lubricant.

[0019] Example 2: In step 1, the mass ratio of monostearate to vegetable oil is 20:80, and the mixture is heated to 40°C and stirred continuously for 10 minutes.

[0020] Example 3: In step 1, the mass ratio of monostearate to vegetable oil is 40:90, and the mixture is heated to 130°C and stirred continuously for 15 minutes.

[0021] Example 4: This embodiment provides several implementation methods for the vegetable oils in step 1, specifically: A1 corn oil, A2 soybean oil, A3 palm oil, A4 rapeseed oil, A5 olive oil, A6 sunflower seed oil, A7 castor oil, and A8 coconut oil. In specific use, one or a mixture of several of these can be selected, where A1-A8 are implementation method numbers.

[0022] Example 5: This embodiment provides several implementation methods for the ionic liquid in step 2, specifically: B1: 1-butyl-3-methylimidazolium hexafluorophosphate, B2: 1-ethyl-3-methylimidazolium tetrafluoroborate, B3: 1-hexyl-3-methylimidazolium chloride, B4: 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, B5: 1-octyl-3-methylimidazolium hexafluorophosphate, B6: 1-ethyl-3-methylimidazolium acetate, B7: 1-butylpyridine tetrafluoroborate, and B8: 1-butyl-1-methylpyrrolidine bis(trifluoromethanesulfonyl)imide ([BMP][Tf2N]). In use, one or a mixture of these solutions can be selected, where B1-B8 are specific embodiment numbers.

[0023] Example 6: This embodiment provides a preferred method using vegetable oil and ionic liquid, namely: in step 1, the vegetable oil refers to castor oil, and in step 2, the ionic liquid is 1-octyl-3-methylimidazolium hexafluorophosphate.

[0024] Example 7: In step 2, the mixture is cooled to 30°C, and the mass fraction of the ionic liquid is 1 part.

[0025] Example 8: In step 2, the mixture is cooled to 90°C, and the mass fraction of the ionic liquid is 20 parts.

[0026] In summary, this invention successfully prepared a green conductive gel lubricant (such as castor oil as the base oil, combined with glyceryl monostearate and ionic liquid) using castor oil as the base oil. Figure 1 As shown in the figure, the preparation method is simple, inexpensive, and suitable for large-scale production. Figure 2 As shown, this lubricant exhibits excellent viscoelasticity, thermal reversibility, and creep resistance, significantly reducing the coefficient of friction and wear rate at the friction interface, effectively inhibiting arc corrosion, and maintaining stable performance even after long-term cyclic friction. It adapts to complex working conditions, providing a high-performance and sustainable alternative to traditional lubricants, while also opening up new avenues for the design of multifunctional conductive lubricants in green engineering applications.

Claims

1. A method for preparing a green and environmentally friendly conductive lubricant, characterized in that, Includes the following steps: Step 1: Add monostearate to the vegetable oil, heat the mixture and stir continuously and thoroughly. Step 2: Then cool the mixture, add the ionic liquid and continue stirring; Step 3: Slowly cool the mixture with added ionic liquid to room temperature or refrigerate it to -1 to 10°C to obtain the target product, conductive lubricant.

2. The preparation method of the green and environmentally friendly conductive lubricant as described in claim 1, characterized in that, In step 1, the mass ratio of monostearate to vegetable oil is 20:80, and the mixture is heated to 40-130°C and stirred continuously for no less than 10 minutes.

3. The preparation method of the green and environmentally friendly conductive lubricant as described in claim 2, characterized in that, In step 1, vegetable oil refers to one or a mixture of several of the following: corn oil, soybean oil, palm oil, rapeseed oil, olive oil, sunflower oil, castor oil, and coconut oil.

4. The preparation method of the green and environmentally friendly conductive lubricant as described in claim 3, characterized in that, In step 2, the ionic liquid refers to one or a mixture of several of the following: 1-butyl-3-methylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-hexyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-octyl-3-methylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium acetate, 1-butylpyridine tetrafluoroborate, and 1-butyl-1-methylpyrrolidine bis(trifluoromethanesulfonyl)imide.

5. The preparation method of the green and environmentally friendly conductive lubricant as described in claim 4, characterized in that, In step 1, the vegetable oil refers to castor oil, and in step 2, the ionic liquid is 1-octyl-3-methylimidazolium hexafluorophosphate.

6. The preparation method of the green and environmentally friendly conductive lubricant as described in claim 5, characterized in that, In step 2, the mixture is cooled to 30-90°C, and the mass fraction of the ionic liquid is 1-20 parts.

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