CN112143541A - Molybdenum disulfide and tungsten disulfide mixed nano lubricating oil additive and application thereof - Google Patents
Molybdenum disulfide and tungsten disulfide mixed nano lubricating oil additive and application thereof Download PDFInfo
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- CN112143541A CN112143541A CN202011082448.4A CN202011082448A CN112143541A CN 112143541 A CN112143541 A CN 112143541A CN 202011082448 A CN202011082448 A CN 202011082448A CN 112143541 A CN112143541 A CN 112143541A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
- C10M125/22—Compounds containing sulfur, selenium or tellurium
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/065—Sulfides; Selenides; Tellurides
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/065—Sulfides; Selenides; Tellurides
- C10M2201/066—Molybdenum sulfide
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/40—Fatty vegetable or animal oils
- C10M2207/401—Fatty vegetable or animal oils used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/042—Sulfate esters
Abstract
The invention relates to preparation and application of a molybdenum disulfide and tungsten disulfide mixed nano lubricating oil additive, and belongs to the technical field of lubrication. The invention discloses a nano lubricating oil additive composed of nano MOS2And nano WS2Hybrid composition, MOS2Powder, WS2The particle size range of the powder is 60-80 nm. The obtained nano additive added into the basic lubricating oil can not only improve the self wear resistance and antifriction performance of the basic lubricating oil, but also act on the surface of a friction pair, improve the roughness of the surface of the friction pair and repair the grinding marks on the surface, thereby reducing the abrasion marksThe abrasion loss of the friction pair effectively ensures the precision of the friction pair and prolongs the service life of the cutter. The test data shows that the friction coefficient of the lubricating oil added with the additive disclosed by the patent of the invention is reduced by 33-17% compared with the lubricating oil not added with the additive disclosed by the patent of the invention.
Description
Technical Field
The invention relates to a mixed nano lubricating oil additive and application thereof, belonging to the technical field of lubrication.
Background
Rubbing is a phenomenon commonly occurring during machining. In the machining industry, huge economic losses are caused by damage of mechanical equipment parts caused by friction and wear, and related lubricants and lubricating technologies are researched in various countries all over the world in order to reduce the losses caused by friction and wear. The lubricating oil is widely applied to reducing the friction and the abrasion in the product processing process, provides a lubricating film on the processing surface, reduces the friction to the maximum extent, accelerates the heat dissipation, and is an important method for improving the energy utilization rate. The lubricating oil greatly determines the service performance of the lubricating oil, and the improvement of the lubricating oil cannot be separated from the research and development of the additive.
With the continuous development of nanotechnology, nanoparticles have been applied more and more in tribology field due to their excellent physicochemical properties. Nanoparticles have small size effects, surface and interface effects, low flow velocities, and the like. When the nano particles are dispersed in the lubricating oil and enter a friction pair, the sliding friction is changed into rolling friction, namely the rolling ball-like effect is achieved, and the anti-wear and anti-wear properties of the lubricating oil are improved. In addition, because the nano particles have small particle size and high surface activity, an adsorption film can be formed on the surface of the workpiece, and the adsorption film can permeate into the material along with the rise of the temperature to fill grinding marks on the surface of the workpiece, so that the effect of repairing the surface is achieved. A series of researches show that the nano particles have better wear resistance and wear reduction performance than the traditional additive under the conditions of high temperature, low temperature, drying and extreme pressure.
In recent years, as an important leading-edge subject in the field of tribology, researchers at home and abroad combine nanotechnology and lubrication technology to develop a series of nanometer additive materials with good wear-resistant, wear-reducing and self-repairing performances. At present, the nano lubricating material mainly comprises inorganic nano simple substances, nano oxides, nano hydroxides, nano sulfides, nano borides, nano rare earth compounds and the like. The nano sulfide mainly comprises MOS2、WS2、Ag2S, CuS, etc. Has studied WS2、MOS2And the tribological properties of three nano additives of graphite, the three nano additives can obviously improve the wear resistance of the lubricating oil and reduce the damage condition of a wear surface, and the nano WS is high-temperature2Has obvious self-repairing effectObviously, the method has great relation with the surface adsorption capacity and the high temperature resistance of the nanoparticles. Many nanoparticles can improve the wear resistance and the bearing capacity of base oil as additives, however, the research reports of mixed nanomaterials as lubricating oil additives are less at present.
1. The national patent of 'a preparation method of magnesium silicate/carbon composite nano lubricant' (publication No. CN108219895) reports that nano magnesium silicate and nano carbon are added into lubricating oil according to a certain proportion, so that the friction coefficient of the lubricating oil can be obviously reduced, the abrasion is reduced, the lubricating capability and the efficiency of the lubricating oil are greatly improved, and in addition, the adhesion film generated by the nano particles in friction pair can repair the damaged part of the metal surface and prevent the abrasion.
2. The national patent "an aluminum nitride and copper mixed nano grease additive and application thereof" (publication number CN104031717) reports that nano aluminum nitride and nano copper are used as main components to be added into polyurea grease, so that the friction coefficient of the grease is reduced by 23.6-15.8%, and the wear-resistant life is prolonged by 6-7 times.
3. National patent "a ferroferric oxide/tungsten disulfide nano composite lubricant and a preparation method thereof" (publication number CN105802699) reports that nano ferroferric oxide and nano tungsten disulfide are added into a lubricant, and the obtained lubricating liquid has excellent lubricating performance and effectively prolongs the lubricating time.
The national patent of copper-graphite-tungsten disulfide nanotube self-lubricating composite material and a preparation method thereof (publication number CN103045971) reports that a copper-based lubricating material composite material reinforced by tungsten disulfide nanotubes and graphite has high mechanical strength, excellent frictional wear performance and good environmental adaptability.
The above invention research is not directed to the MOS2And WS2The mixed nanoparticles were added to base lubricating oils as lubricant additives for research.
Disclosure of Invention
The invention aims to provide a novel mixed nano lubricating oil additive and application thereof in lubricating oil, wherein mixed nano particles are added into basic lubricating oil, so that the wear resistance and wear reduction performance of the lubricating oil can be improved, the heat conduction performance of the lubricating oil can be obviously improved, the roughness of the surface of a grinding area is improved, the wear of the surface of a friction pair is repaired, and the service life of a cutter is prolonged.
In order to achieve the above object, the present invention adopts the following technical solutions.
The additive comprises the following components in percentage by mass:
MOS20 to 75 percent of powder
WS20 to 75 percent of powder
MOS2Powder, WS2The particle size range of the powder is 60-80 nm, and when the powder is used, the additive is added into the basic lubricating oil; dimethyl sulfate was added as a dispersant.
The basic lubricating oil is industrial palm oil.
The method for adding the additive into the base lubricating oil is that the nano lubricating oil preparation process adopts a two-step method, and the prepared nano particles are dispersed into the base oil to complete the preparation of the nano lubricating oil. In the preparation process, the nano particles are mixed with base oil, and dimethyl sulfate is added as a dispersing agent. And (3) placing the prepared nano lubricating oil on a numerical control ultrasonic oscillator, wherein the ultrasonic treatment temperature is 50 ℃, the ultrasonic treatment frequency is 40KHz, and the ultrasonic treatment time is 30 minutes, so that the nano lubricating oil is uniformly dispersed in the basic lubricating oil, and the mixed nano lubricating oil is obtained.
The base lubricating oil is industrial palm oil which is good in stability and not easy to oxidize, a formed lubricating oil film is stable, the content of palmitic acid in the palm oil reaches 45.1%, and the formed adsorbed lubricating oil film is good in durability and strong and good in lubricating property; and can well contain nano particles, and the basic dispersion performance is excellent.
The invention has the advantages and beneficial effects that: molybdenum disulfide (MOS)2) Has been a solid lubricating material which is very important and widely used in the industrial field. The nano molybdenum disulfide used as the lubricant has high compressive strength and wear resistance, excellent adhesiveness, lower friction coefficient, film forming structural characteristics, stable film generation under high pressure and excellent dispersibilityThe heat conductivity of the molybdenum disulfide can reach 140W (m.K), and the melting point is 1185 ℃; the lubricating grease has high-efficiency lubricating performance under high-temperature and high-pressure conditions, low-temperature conditions, chemical corrosion conditions and vacuum conditions; tungsten disulfide (WS)2) Is a novel lubricating anti-wear material, has strong thermal stability and lubricating property, is high temperature resistant and wear resistant, and has extreme pressure strength reaching 21 MP. The patent synthesizes MOS2And WS2The mixed nano additive has good performance, plays a good heat conduction role on a friction and wear surface, and improves the heat dissipation performance of a grinding area; the nano particles have high hardness and melting point, play a role of a ball bearing on the surface of a grinding area, change sliding friction into rolling friction, and further play a role in reducing friction coefficient and grinding force, and meanwhile, the particles can play a role in repairing surface grinding marks under the action of pressure.
The lubricating oil prepared above was subjected to tribology experiments, and the data obtained were as follows:
1. the friction coefficient of the composite nano lubricating oil is that u is 0.0483-0.0563; the coefficient of friction of the base lubricant was 0.0762.
The invention has the beneficial effects that: compared with the lubricating oil without the additive, the lubricating oil with the additive has the friction coefficient reduced by 33-17%.
Drawings
FIG. 1 is a comparative graph of performance tests of lubricating oil with the nanoparticles of the present invention added and lubricating oil without the nanoparticles added.
FIG. 2 is a microscopic representation of the effect of nanoparticles on the surface of a friction pair.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
Examples 1 to 8
1. Test materials
Nano MOS for test2Powder, nano WS2The two kinds of nano powder are purchased from Ningbo Bowss nanometer technology Co., Ltd, and the particle size ranges from 60 nm to 80 nm; the base lubricant is industrial palmAnd (3) oil.
The test friction pair adopts a ball disc friction mode, the upper test ball is GCr15 steel, the lower test disc is GCr15 steel, and the test ball is GCr15 steel
The test panel has the size of
2. Preparation of mixed nano lubricating oil
Firstly, nano MOS is weighed according to the proportion provided in Table 12Powder, nano WS2Powder; and dispersing the prepared nano particles into lubricating base oil to finish the preparation of the nano lubricating oil. In the preparation process, the nano particles are mixed with base oil, and dimethyl sulfate is added as a dispersing agent. And (3) placing the prepared nano lubricating oil on a numerical control ultrasonic oscillator, wherein the ultrasonic treatment temperature is 50 ℃, the ultrasonic treatment frequency is 40KHz, and the ultrasonic treatment time is 30 minutes, so that the nano lubricating oil is uniformly dispersed in the basic lubricating oil, and the mixed nano lubricating oil is obtained.
3. Test apparatus
The test is carried out on a UMT-3 friction wear testing machine, the test friction mode is ball disc friction, the applied load is constant and is 40kg, and the friction force is measured by a sensor and can be displayed in a software system configured by the equipment. The test results of this test are shown in table 1.
TABLE 1 composite nanometer lubricating oil performance test table
| Examples | MOS2/g | WS2/g | Base oil/g | Dispersant/g | Coefficient of friction |
| 1 | 0 | 0 | 100 | 0 | 0.0762 |
| 2 | 0.1 | 0 | 100 | 0.05 | 0.0613 |
| 3 | 0 | 0.1 | 100 | 0.05 | 0.0584 |
| 4 | 0.025 | 0.075 | 100 | 0.05 | 0.0563 |
| 5 | 0.05 | 0.15 | 100 | 0.1 | 0.0539 |
| 6 | 0.125 | 0.375 | 100 | 0.25 | 0.0483 |
| 7 | 0.2 | 0.6 | 100 | 0.4 | 0.0528 |
| 8 | 0.25 | 0.75 | 100 | 0.5 | 0.0549 |
Claims (4)
1. A molybdenum disulfide and tungsten disulfide mixed nanometer lubricating oil additive is characterized in that: the additive comprises the following components in percentage by mass:
MOS2powder (0-75%)
WS2Powder (0-75%)
The MOS2Powder, WS2The particle size range of the powder is 60-80 nm, and the nanoparticles are added into the base lubricating oil when the powder is used.
2. A mixed nanometer lubricating oil is composed of basic lubricating oil and additives, and is characterized in that: the base lubricant is industrial palm oil, and the additive is the mixed nano lubricant additive as defined in claim 1.
3. The mixed nano-lubricating oil as recited in claim 2, wherein: the addition amount of the additive is 0.1-1% of the mass of the basic lubricating oil.
4. The mixed nano-lubricating oil as recited in claim 2, characterized in that the lubricating oil is prepared by the following method: the preparation process of the nano lubricating oil adopts a two-step method, and the prepared nano particles are dispersed into the base oil to complete the preparation of the nano lubricating oil. In the preparation process, the nano particles are mixed with base oil, and dimethyl sulfate is added as a dispersing agent. The prepared nano lubricating oil is placed on a numerical control ultrasonic oscillator, the ultrasonic treatment temperature is 50 ℃, the ultrasonic treatment frequency is 40KHz, and the ultrasonic treatment time is 30 minutes. Uniformly dispersing the mixed nano lubricating oil in the basic lubricating oil to obtain the mixed nano lubricating oil.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355633A (en) * | 2021-05-25 | 2021-09-07 | 清华大学 | Surface treatment method of gear pair |
| CN114213941A (en) * | 2021-09-24 | 2022-03-22 | 湘潭大学 | High-performance antifriction and wear-resistant coating for piston skirt and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101398123A (en) * | 2007-09-29 | 2009-04-01 | 中国人民解放军装甲兵工程学院 | WS2/MoS2 solid lubrication multilayer film and method for making same |
| CN107739646A (en) * | 2017-10-13 | 2018-02-27 | 中国科学院过程工程研究所 | A kind of modified transformer oil, preparation method and purposes |
| CN107937089A (en) * | 2017-11-10 | 2018-04-20 | 中国科学院兰州化学物理研究所 | The application of molybdenum disulfide or tungsten disulfide quantum dot as high―temperature nuclei lubricating oil antiwear and friction-reducing additive |
| CN108977254A (en) * | 2018-07-05 | 2018-12-11 | 安徽旋利达电机有限公司 | A kind of preparation method of the nanometer particle-modified antiwear and antifriction lubricating oil of motor |
| CN110747036A (en) * | 2019-10-18 | 2020-02-04 | 界首市锦田农业机械装备有限公司 | High-quality micro-emulsified cutting fluid for metal processing |
-
2020
- 2020-10-12 CN CN202011082448.4A patent/CN112143541A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101398123A (en) * | 2007-09-29 | 2009-04-01 | 中国人民解放军装甲兵工程学院 | WS2/MoS2 solid lubrication multilayer film and method for making same |
| CN107739646A (en) * | 2017-10-13 | 2018-02-27 | 中国科学院过程工程研究所 | A kind of modified transformer oil, preparation method and purposes |
| CN107937089A (en) * | 2017-11-10 | 2018-04-20 | 中国科学院兰州化学物理研究所 | The application of molybdenum disulfide or tungsten disulfide quantum dot as high―temperature nuclei lubricating oil antiwear and friction-reducing additive |
| CN108977254A (en) * | 2018-07-05 | 2018-12-11 | 安徽旋利达电机有限公司 | A kind of preparation method of the nanometer particle-modified antiwear and antifriction lubricating oil of motor |
| CN110747036A (en) * | 2019-10-18 | 2020-02-04 | 界首市锦田农业机械装备有限公司 | High-quality micro-emulsified cutting fluid for metal processing |
Non-Patent Citations (4)
| Title |
|---|
| 代莹静等: "层状磷酸锆固体润滑特性的研究进展", 《太原理工大学学报》 * |
| 尹桂林等: "MoS_2/WS_2共溅射复合薄膜的微结构及其摩擦磨损性能研究", 《摩擦学学报》 * |
| 张怀亮等: "纳米粒子WS_2和MoS_2作为润滑油添加剂的摩擦学性能实验研究", 《石油炼制与化工》 * |
| 施凯烽等: "纳米二硫化钨和二硫化钼薄膜制备方法概述", 《化工时刊》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355633A (en) * | 2021-05-25 | 2021-09-07 | 清华大学 | Surface treatment method of gear pair |
| CN114213941A (en) * | 2021-09-24 | 2022-03-22 | 湘潭大学 | High-performance antifriction and wear-resistant coating for piston skirt and preparation method thereof |
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Application publication date: 20201229 |