阅读说明：本技术 一种石墨烯润滑油 (Graphene lubricating oil ) 是由 罗中晨 于 2020-06-05 设计创作，主要内容包括：本发明公开了润滑油技术领域,具体领域为一种石墨烯润滑油,其组分包括改性石墨烯粉体和改性润滑油,由于高锰酸钾插层进入片层内部,形成大量的毛细孔道结构,有助于石墨烯片层的进一步剥离,暴露更多的片层,大量的长链烷烃接枝在片层表面,接枝率高,从而使团聚的片层得以分散,双辛基二苯胺的加入进一步增加石墨烯片层官能团数量,增大石墨烯润滑油中的浮力,从而达到分散均匀不沉淀的技术效果,改性润滑油中含有的分散性物质增强改性石墨烯粉体与基础油的结合能力,聚乙烯蜡具有优良的耐寒性、耐热性进和耐化学性,聚乙烯蜡在改性润滑油中以微晶形式存在,其触变性有利于改性润滑油的贮存。(The invention discloses the technical field of lubricating oil, in particular to graphene lubricating oil, which comprises modified graphene powder and modified lubricating oil, wherein potassium permanganate is intercalated into a lamella to form a large number of capillary channel structures, which is beneficial to further stripping of the graphene lamella, exposes more lamellae, grafts a large number of long-chain alkanes on the surface of the lamella, has high grafting rate, so that the agglomerated lamella can be dispersed, the addition of dioctyldiphenylamine further increases the number of functional groups of the graphene lamella, increases the buoyancy in the graphene lubricating oil, so as to achieve the technical effect of uniform dispersion and no precipitation, a dispersing substance contained in the modified lubricating oil enhances the binding capacity of the modified graphene powder and base oil, polyethylene wax has excellent cold resistance, heat resistance and chemical resistance, and exists in the modified lubricating oil in a microcrystalline form, the thixotropy of the modified lubricating oil is beneficial to the storage of the modified lubricating oil.)

1. A graphene lubricating oil is characterized in that: the components of the modified graphene powder comprise modified graphene powder and modified lubricating oil;

the modified graphene powder comprises the following raw materials in parts by weight: 5-10 parts of graphene powder, 10-20 parts of stearic acid, 10-20 parts of oleic acid and 10-20 parts of dioctyl diphenylamine;

the modified lubricating oil comprises the following raw materials in parts by weight: 80-100 parts of base white oil, 1.6-2 parts of molybdenum powder microspheres, 1.6-2 parts of chromium powder microspheres, 0.8-1 part of ferric oxide microspheres, 1.6-2 parts of benzotriazole, 3.2-4 parts of di-n-butyl phosphite, 2-4 parts of lithium fluoborate and 2-4 parts of polyethylene wax.

2. The graphene lubricating oil according to claim 1, wherein: the modified graphene powder comprises the following raw materials in parts by weight: 6-9 parts of graphene powder, 12-16 parts of stearic acid, 12-16 parts of oleic acid and 12-16 parts of dioctyl diphenylamine;

the modified lubricating oil comprises the following raw materials in parts by weight: 85-95 parts of base white oil, 1.7-1.9 parts of molybdenum powder microspheres, 1.7-1.9 parts of chromium powder microspheres, 0.9 part of ferric oxide microspheres, 1.7-1.9 parts of benzotriazole, 3.5-3.8 parts of di-n-butyl phosphite, 3 parts of lithium fluoborate and 3 parts of polyethylene wax.

3. The graphene lubricating oil according to any one of claims 1 to 2, characterized in that:

the preparation method of the modified graphene powder comprises the following steps:

step 1: adding stearic acid and oleic acid into acetone, stirring for 30min, adding graphene powder, continuing stirring for 1h, and then adding potassium permanganate to obtain black homogeneous slurry;

step 2: carrying out condensation reflux treatment on the slurry prepared in the step 1, reacting for 3 hours in a constant-temperature water bath at 50 ℃, filtering the slurry, and washing with absolute ethyl alcohol;

and step 3: and (3) blending the slurry prepared in the step (2) with dioctyl diphenylamine, placing the blend in a vacuum oven, drying for 6 hours at the temperature of 80 ℃, and then crushing the dried mixture to obtain the modified graphene powder.

4. The graphene lubricating oil according to any one of claims 1 to 2, characterized in that:

the preparation method of the modified lubricating oil comprises the following steps:

step 1: adding molybdenum powder microspheres, chromium powder microspheres, ferric oxide microspheres, benzotriazole, di-n-butyl phosphite and lithium fluoroborate into base white oil, and dispersing at high speed at room temperature;

step 2: and (2) adding polyethylene wax into the mixture prepared in the step (1), and uniformly mixing at the temperature of 120 ℃ to obtain the modified lubricating oil.

5. The graphene lubricating oil according to any one of claims 1 to 2, characterized in that: the mass ratio of the modified graphene powder to the modified lubricating oil is 1: 1200-1250.

Technical Field

The invention relates to the technical field of lubricating oil, in particular to graphene lubricating oil.

Background

In recent years, a great deal of research proves that the graphene has excellent lubricating effect in basic white oil, but the graphene is easy to agglomerate and delaminate due to a strong pi-pi bond between graphene sheets, so that the dispersibility of the graphene in the lubricating oil is always a key factor for limiting the further development of the graphene lubricating oil, in order to ensure that the graphene can be stably dispersed in the basic oil, a more effective method is to functionally modify the graphene, and the existing functional modification method comprises the steps of grafting straight-chain alkane and a polar group on the surface of graphene oxide by a click chemistry method, and then reducing the graphene into graphene, the graphene lubricating oil has the advantages that the graphene lamellar layers can be stably dispersed in the lubricating oil for a long time, the film forming property of graphene in the lubricating oil is enhanced, and the abrasion resistance of the lubricating oil is improved, but only the graphene is modified, so that the improvement of the dispersity of the graphene lamellar layers in the lubricating oil is limited, the performance improvement effect of the graphene on the lubricating oil is poor, and therefore the graphene lubricating oil is provided.

Disclosure of Invention

The present invention is directed to a graphene lubricating oil to solve the problems set forth in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a graphene lubricating oil comprises modified graphene powder and modified lubricating oil;

the modified graphene powder comprises the following raw materials in parts by weight: 5-10 parts of graphene powder, 10-20 parts of stearic acid, 10-20 parts of oleic acid and 10-20 parts of dioctyl diphenylamine;

the modified lubricating oil comprises the following raw materials in parts by weight: 80-100 parts of base white oil, 1.6-2 parts of molybdenum powder microspheres, 1.6-2 parts of chromium powder microspheres, 0.8-1 part of ferric oxide microspheres, 1.6-2 parts of benzotriazole, 3.2-4 parts of di-n-butyl phosphite, 2-4 parts of lithium fluoborate and 2-4 parts of polyethylene wax.

Preferably, the modified graphene powder comprises the following raw materials in parts by weight: 6-9 parts of graphene powder, 12-16 parts of stearic acid, 12-16 parts of oleic acid and 12-16 parts of dioctyl diphenylamine;

the modified lubricating oil comprises the following raw materials in parts by weight: 85-95 parts of base white oil, 1.7-1.9 parts of molybdenum powder microspheres, 1.7-1.9 parts of chromium powder microspheres, 0.9 part of ferric oxide microspheres, 1.7-1.9 parts of benzotriazole, 3.5-3.8 parts of di-n-butyl phosphite, 3 parts of lithium fluoborate and 3 parts of polyethylene wax.

Preferably, the preparation method of the modified graphene powder comprises the following steps:

step 1: adding stearic acid and oleic acid into acetone, stirring for 30min, adding graphene powder, continuing stirring for 1h, and then adding potassium permanganate to obtain black homogeneous slurry;

step 2: carrying out condensation reflux treatment on the slurry prepared in the step 1, reacting for 3 hours in a constant-temperature water bath at 50 ℃, filtering the slurry, and washing with absolute ethyl alcohol;

and step 3: and (3) blending the slurry prepared in the step (2) with dioctyl diphenylamine, placing the blend in a vacuum oven, drying for 6 hours at the temperature of 80 ℃, and then crushing the dried mixture to obtain the modified graphene powder.

Preferably, the preparation method of the graphene lubricating oil comprises the following steps:

step 1: adding molybdenum powder microspheres, chromium powder microspheres, ferric oxide microspheres, benzotriazole, di-n-butyl phosphite and lithium fluoroborate into base white oil, and dispersing at high speed at room temperature;

step 2: and (2) adding polyethylene wax into the mixture prepared in the step (1), and uniformly mixing at the temperature of 120 ℃ to obtain the modified lubricating oil.

Preferably, the mass ratio of the modified graphene powder to the modified lubricating oil is 1: 1200-1250.

The invention has the beneficial effects that: a graphene lubricating oil, modified graphene powder, because potassium permanganate intercalation enters the inside of a sheet layer to form a large amount of capillary channel structures, further stripping of graphene sheet layers is facilitated, more sheet layers are exposed, a large amount of long-chain alkane is grafted on the surface of the sheet layers, the grafting rate is high, so that the agglomerated sheet layers are dispersed, the long-chain alkane grafted on the surface of the sheet layers through esterification can offset the surface electrical property of graphene, so that agglomeration, bending and curling of the sheet layers can be prevented, the graphene sheet layers are completely unfolded and are in a fluffy state, the long-chain alkane on the surfaces of the graphene sheet layers and the sheet layers can promote the dispersion stability of the graphene in the lubricating oil, the agglomeration and precipitation of the graphene are effectively prevented, the integral stability of the graphene lubricating oil is enhanced, the number of functional groups of the graphene sheet layers is further increased by adding dioctyl diphenylamine, the buoyancy in the graphene lubricating oil is increased, so that the technical effect of uniform dispersion and no precipitation is achieved, dispersible substances such as molybdenum powder microspheres and chromium powder microspheres contained in the modified lubricating oil effectively act on hydroxyl and long-chain alkane on the surface of the modified graphene powder, the binding capacity of the modified graphene powder and base oil is enhanced, the polyethylene wax has excellent cold resistance, heat resistance and chemical resistance, the polyethylene wax exists in the modified lubricating oil in a microcrystalline form, the thixotropy of the polyethylene wax is favorable for storage of the modified lubricating oil, and in the using process of the lubricating oil, the polyethylene wax and other components of the lubricating oil form a waxed film layer, so that the lubricating property of the lubricating oil is further enhanced.

According to the graphene lubricant, the graphene can continuously repair the workpiece in the lubricating process, so that the workpiece is prevented from being instantly and directly contacted and abraded, meanwhile, the high thermal conductivity of the graphene can quickly transfer the heat of the workpiece to lubricating oil, and the cooling is accelerated through the flowing of an oil product, so that the friction is further reduced, the workpiece is protected, the lubricating property is high, and meanwhile, the beneficial effects of reducing the working noise of the workpiece and reducing the vibration of the workpiece are realized.

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

preparing modified graphene powder:

step 1: adding 10 parts of stearic acid and 10 parts of oleic acid into acetone, stirring for 30min, adding 5 parts of graphene powder, continuing stirring for 1h, and then adding potassium permanganate to obtain black homogeneous slurry;

step 2: carrying out condensation reflux treatment on the slurry prepared in the step 1, reacting for 3 hours in a constant-temperature water bath at 50 ℃, filtering the slurry, and washing with absolute ethyl alcohol;

and step 3: and (3) blending the slurry prepared in the step (2) with 10 parts of dioctyldiphenylamine, placing the blend in a vacuum oven, drying for 6 hours at the temperature of 80 ℃, and then crushing the dried mixture to obtain the modified graphene powder.

Preparing modified lubricating oil:

step 1: adding 1.6 parts of molybdenum powder microspheres, 1.6 parts of chromium powder microspheres, 0.8 part of iron oxide microspheres, 1.6 parts of benzotriazole, 3.2 parts of di-n-butyl phosphite and 2 parts of lithium fluoroborate into 80 parts of base white oil, and dispersing at high speed at room temperature;

step 2: and (2) adding 3 parts of polyethylene wax into the mixture prepared in the step (1), and uniformly mixing at the temperature of 120 ℃ to obtain the modified lubricating oil.

Mixing modified graphene powder and modified lubricating oil in a mass ratio of 1: 1200, uniformly mixing to obtain the graphene lubricating oil.