Molybdenum compound friction modifier occupies a significant place in numerous lubricating materials is due to its excellent tribological performance, can significantly improve the antiwear and friction-reducing lubricant, reducing friction and wear on the surface of the friction pair, show excellent high temperature oxidation resistance, and also can improve the mechanical efficiency of the engine, significantly improve vehicle fuel economy. The most commonly used molybdenum-containing compounds are: molybdenum disulfide (MoS2), oil-soluble dialkyl dithiocarbamate oxysulfide molybdenum (MoDTC) and dialkyl dithiophosphate oxysulfide molybdenum (MoDTP).With the rapid development of related industries ，such as the automobile industry, ship industry, and petroleum industry, the consumption of molybdenum products is rising rapidly, and the variety is increasing.

Molybdenum disulfide (MoS2), as grease lubricant used for over 70 years of history, is one of the most widely used stable oils.Natural MoS2 is a layered structure, and the S atom binding force between layers is weak, so it is easy to slide and shows a good anti-friction effect. On the other hand, the ionic bond between Mo and S atoms gives the MoS2 lubrication film a higher strength, which can prevent the lubrication film from penetrating the protruding part of the metal surface. However, S atom is exposed to the surface of the MoS2 crystal layer and has strong adhesion to the metal surface. The chemical properties of MoS2 are very stable, resistant to acid and radiation, and the decomposition temperature is 1000℃ under vacuum condition.MoS2 has outstanding substantial lubrication capability under heavy load with heating. In recent years, MoS2 has expanded from particular USES developed in the universe to the general industry. Annual consumption in the United States exceeds 2,000 tons and in Japan over 4,000 tons.

At present, organic molybdenum additive is widely used in industrially developed countries and emerging industrial nations. The annual consumption of organic molybdenum additive in the United States is about 2500 ~ 3000t, mainly used in internal combustion engine lubricating oil, turbine engine lubricating oil, and other fields. In all kinds of bearing oils for internal combustion engines produced in Japan, 0.5% ~ 1% organic molybdenum additive is usually added. The additive is supplied by Asahi chemical co., Japan's largest petroleum additive company. Besides, organic molybdenum additive is also used in antiwear oil, vacuum oil, bearing grease, guide oil, compressor oil, and gear oil. Besides the natural molybdenum produced in Japan, about 4% MoDTC and MoDTP are exported to Western Europe and Southeast Asian countries. Rhein Chemie Gruppe's MoDTP is widely used in Germany, the world's fourth-largest economy.

Infomak is dedicated to the technology development of special oil additives, combined the Technology of nanomaterials developed dry lubricant and oil additives two series. Our products can significantly improve the performance of lubricating oil, improve energy efficiency, effectively protect the lubrication device and extend the oil change cycle, which can satisfy the lubrication oil constantly upgrading for high-end engine oil additives. If you are looking for MoDTC or MoDTP, please contact us.

The primary function of lubricating oil is lubrication, heat dissipation, anti-wear, shock absorption, and cleaning. It can be said that lubricating oil is like the blood of the engine, so the service life of the engine also depends on the quality of the engine oil. Choose a suitable lubricant wisely. It is also an important thing, and today I will teach you how to choose a suitable engine oil. The engine oil ranges from the US $ 15-100, and there is a distinction between fully synthetic, semi-synthetic, and mineral oil. So what is the difference between them? How do we choose the right engine oil?

First, the cheapest mineral oil is around $ 15.

Most mineral oils are synthesized using class II base oils combined with lubricating oil additives.Class Ⅱ base oil: It is also called hydrogenated base oil using the hydrocracking process. 

Disadvantages: the molecules are arranged unevenly, and a little more impurities mean higher friction. It is not easy to dissolve with chemical additives and quickly produce chemical reactions, so there will not be too many frictions reducing oil additives, antioxidants, and pour point depressants. High-temperature protection can only rely on high viscosity to increase the oil film thickness to protect the engine! That is, the characteristic 10W40 high viscosity has an absolute increase in the engine running resistance. Poor fluidity during cold start results in loud noise, etc.! Therefore, the current mineral oil is gradually replaced by semi-synthetic; after all, the price is relatively close. In cold seasons, starting difficulties may occur, or cold-start wear may increase.

Secondly, a semi-synthetic engine oil around $ 30

It is a combination of mineral oil and class III base oil. Compared with mineral oil, semi-synthetic class III base oil has less purity and impurities. It adopts high hydrocracking or hydroisomerization process to filter out the mineral oil. Impurities, prevent accelerated oxidation, rearrange the molecules inside. This also means that the friction is smaller, and it can also make differential oil additive better compatible with the base oil. After adding anti-friction additives, it can also achieve low viscosity and high protection under high-temperature conditions, which is why turbines are required. For reasons above semi-synthesis, the turbine temperature of thousands of degrees must also rely on engine oil to dissipate heat. Semi-synthesis is treated, and the synthetic fluidity is higher. Adding a small amount of the best oil additive can also make the oil film difficult to crack under high pressure and encounter high-temperature oxidation. And more stable. Of course, semi-synthetic is still semi-synthetic, after all. Due to the base oil, the long-term performance and stability are not the best.

Finally, fully synthetic engine oil of around $ 100

At present, most of the fully synthetic engine oils are the type mentioned above III base oils combined with the four types of base oils. The addition of the four types of oils makes up the low-temperature fluidity and high-temperature protection of the type III oils due to the addition of the four kinds of insufficient oils that can be said to be an enhanced version of semi-synthetic engine oil in all aspects. Fully synthetic engine oil has higher fluidity at high temperatures and low temperatures. It has added more expensive additives: such as ZDDP (best zinc oil additive), moly additive (MoS2, MoDTC, and MoDTP), hexagonal boron nitride, titanium alloy elements, WS2, lipids, etc. Most of these elements have absolute adsorption on metal, and the friction resistance is meager, which can reduce the engine running strength and reduce the wear between the metal of the engine. This is also a part of the owners who can feel the open after switching from semi-synthetic to fully synthetic. One of the reasons why it feels lighter.

So how to choose the right engine oil?

First, check the maintenance manual of your car. The required labels and engine oil specifications, such as the Japanese American cars require the GF-5 standard, the German vehicles require the A3B4 and C3 measures, and the French system requires the A5B5. Strict or choose a logo certified by your car manufacturer! As for the choice of fully synthetic or semi-synthetic or even mineral oil, the most expensive engine oil currently is double-fat or multi-fat engine oil. It is developed for most racing cars and streetcars, but it has poor long-term performance, is easy to emulsify in water, and is not suitable for daily use. Use. If there is frequent congestion, long-term low-speed crawling, or poor road conditions, choosing a semi-synthetic oil change every six months can keep the engine clean, and it can also ensure that the engine oil is always in the best state.

Fully synthetic engine oil has a higher price. Although it is long-lasting and protective, some gasoline is natural to burn incompletely under adverse road conditions. The impurities left by combustion will be mixed into the engine oil. This will still accelerate the deterioration of the engine oil, and the protection and long-term performance will gradually deteriorate. This is also the reason why some fully synthetic engine oils are marked for replacement within eight months. So if the road conditions are right or if you run a high-speed for a long time, you can run more than 10,000 kilometers for half a year, or thousands of kilometers a year. Choosing a full-synthesis can save a certain amount of cost and time. As for the gap between power and fuel consumption, for some good-powered models, the difference between semi-synthesis and full-synthesis is not too noticeable.

Infomak is dedicated to the technology development of special oil additives, combined the Technology of nanomaterials developed dry lubricant and oil additives two series. Our products can significantly improve the performance of lubricating oil, improve energy efficiency, effectively protect the lubrication device and extend the oil change cycle, which can satisfy the lubrication oil constantly upgrading for high-end engine oil additives. Contact us.

Lubricant oil are widely used in automobiles, machinery, metallurgy, and other industries. They are essential products related to the national economy and people's livelihood.

In the composition of lubricating oil products, the base oil content accounts for 70% to 99%. The best oil additive is an essential factor that determines the performance and service life of lubricating oils. From the 1930s to the present, oil additives have developed many varieties, which have been extended into five categories of additives, namely detergents, dispersant additives, anti-friction oil additive, Antioxidants and viscosity index improvers.

What is the friction modifier?

Engine oil friction modifiers can prevent the metal surface from abrasion, abrasion, and scorch under the condition of high load on the metal surface.It has top active groups and decomposes when the pressure and temperature conditions are severe. The decomposed active materials polymerize under friction to form a thick, tough film, or interact with the surface of the friction pair to form a modified layer, which can reduce wear.

Engine oil friction modifiers can be divided into sulfur-based anti-friction oil additive, phosphorus-based friction reducer oil additive, halogen-based anti-friction oil additive, and organic metal (including lead naphthenate and dialkyl dithiophosphate) ZnDTP, etc.), boron-based antiwear agents (including inorganic borate and natural borate), etc.

However, with the rapid development of modern industry and the continuous improvement of individual requirements for the natural environment and health consciousness, these single-active element antiwear agents have become increasingly challenging to meet the needs of harsh working conditions and the development of the times. For example, chlorine-based friction reducer oil additive has been banned in some countries such as the United States and Western Europe because of its toxicity; lead naphthenate has also been gradually phased out due to ecological and toxicity issues; sulfur- and phosphorus-based anti-friction oil additives will cause exhaust gas converters The three-way catalyst poisoning, affecting the accuracy of the oxygen sensor measurement, and the toxicity to the ecological environment, have been limited to use by international regulations. For example, the amount of ZDTP in American lubricants was reduced from 0.12% in the 1990s to 0.08%. Anti-friction oil additive also has problems with dispersion stability and water sensitivity. Under the international regulations that limit the use of sulfur and phosphorus traditional single-element friction reducer oil additives and the requirements of working conditions are becoming increasingly severe, the diversification and integration of friction reducer oil additives will inevitably develop.

ZDTP is a global best anti-friction oil additive. Although it has catalyst toxicity and other problems, it has superior performance. In addition to outstanding abrasion resistance, it also has oxidation resistance, corrosion resistance, suspension dispersion, and other effects. It is widely used in lubricating oil, such as gear oil.

In 2019, the global production and consumption of lubricant reducer oil additive were nearly 400,000 tons. North America's use of antiwear agents accounts for more than 27% of the worldwide use of friction reducer oil additives, Western Europe's use of friction reducer oil additives accounts for 14% of the world's total consumption of antiwear agents, and China's use of conflict reducer oil additives accounts for the global resistance The full consumption of abrasives reached 16%. Other countries and regions accounted for nearly 43% of the total global use.

In the next few years, the US lubricant market will shrink, and the demand for friction reducer oil additive will also decrease slightly. Western Europe will grow at a rate of 1% to 3%. The need for China's friction reducer oil additive will be 3%. The growth rate is from 5% to 4.5%. There are 13 and 10 companies producing North America and Western Europe Friction Reducer Oil Additives. In addition to the four major lubricant additive companies, BSF, ENI, and Chemtura also participate in it; China currently also has Luoyang Tongrun Info Technology Co., Ltd. All oil additive companies can provide best oil additive products.

With the increasing requirements of environmental protection, the demand for environmentally-friendly lubricant additives has also increased accordingly. While meeting working performance, it should also be biodegradable and environmentally friendly. Low phosphorus, low sulfur, little ash, biological degradability had become a significant development direction for future best oil additives.

In the next few years, the US lubricant market will shrink, and the demand for friction reducer oil additive will also decrease slightly. Western Europe will grow at a rate of 1% to 3%. The need for China's friction reducer oil additive will be 3%. The growth rate is from 5% to 4.5%. There are 13 and 10 companies producing North America and Western Europe Friction Reducer Oil Additives. In addition to the four major lubricant additive companies, BSF, ENI, and Chemtura also participate in it; China currently also has Luoyang Tongrun Info Technology Co., Ltd. All oil additive companies can provide best oil additive products.

With the increasing requirements of environmental protection, the demand for environmentally-friendly lubricant additives has also increased accordingly. While meeting working performance, it should also be biodegradable and environmentally friendly. Low phosphorus, low sulfur, little ash, biological degradability had become a significant development direction for future best oil additives.

Infomak is dedicated to the technology development of special oil additives, combined the Technology of nanomaterials developed dry lubricant and oil additives two series. Our products can significantly improve the performance of lubricating oil, improve energy efficiency, effectively protect the lubrication device and extend the oil change cycle, which can satisfy the lubrication oil constantly upgrading for high-end engine oil additives. Contact us.

Reducing the friction and wear of the main friction pairs of mechanical equipment, reducing energy consumption and reducing environmental pollution are the three major issues facing the design, manufacturing, and use of modern machinery. Lubricants are the key factors. Extreme pressure additive and anti-wear additive are the most commonly used lubricant additives. Under the action of pressure, adding intense pressure anti-wear agents to the lubricant can reduce the friction, wear, and sintering of mechanical parts, make the machine lubricate, thereby improving the working efficiency of the engine and extending the service life of the device. Traditional extreme pressure anti-wear additives usually contain sulfur, phosphorus, and organometallic salts, while new intense pressure anti-wear additives are developing towards ashless, low phosphorus, and low sulfur.

Research and application status of various extreme pressure additive and anti-wear additive

1. Phosphorous extreme pressure additive

Phosphorus-containing organic compound additives have been used as extreme pressure anti-wear additives for a long time, and have obtained a wide range of industrial applications. They are currently one of the most widely used additives with the best anti-wear effects. There are many types of phosphorus extreme pressure additive and anti-wear additive. According to their active elements, they can be divided into phosphorus type, phosphorus nitrogen type, sulfur phosphorus type, sulfur phosphorus nitrogen type, and sulfur phosphorus nitrogen boron type. Phosphorus anti-wear agents have been around for a long time, mainly in phosphate and phosphite series.

2. Nitrogen-containing heterocyclic extreme pressure additive and anti-wear additive

Nitrogen-containing heterocyclic compounds and their derivatives have excellent anti-wear properties, anti-oxidation properties, dispersive properties, rust-proof properties, and anti-corrosive properties. They have been the focus of research in the field of tribology in recent years. Nitrogen heterocyclic additives are divided into: thiazole derivatives, thiadiazole derivatives, oxazolines, benzotriazole derivatives, imidazoline derivatives, pyridine and imidazoline derivatives, diazine derivatives, and triazine derivatives, etc.

3. Boron-containing extreme pressure additive and anti-wear additive

As a new type of non-reactive extreme-pressure anti-wear additive, boron-based additives are receiving more and more attention due to their unique chemical stability. From chemical structure, boron-based additives can be divided into organic borate and inorganic borate. The boron-containing additives not only have excellent thermal oxidation stability and sealing adaptability, have no corrosion effect on copper at high temperature, and have a good impact on steel. Excellent anti-rust performance, at the same time it is conducive to improving the operating environment, has the excellent load-carrying capacity, and anti-friction and anti-wear performance are superior to sulfur and phosphorus additives, has been used in industrial gear oil, two-stroke oil.

The boron-based additives with broad development prospects are organic borate esters. A large number of studies have found that almost all of the organic borate esters have friction reduction and oxidation resistance, and some have anti-wear effects. Besides, its thermal stability is excellent, and it does not corrode copper at high temperatures, has excellent rust resistance to steel, and also has good sealing adaptability, non-toxic and odorless, and conducive to environmental protection. These advantages are incomparable with traditional phosphorus and sulfur extreme pressure anti-wear additives.

4. Organometallic salts extreme pressure additive and anti-wear additive

Organometallic salts are an essential class of lubricating oil additives, which are widely used. According to the structural characteristics of the compounds, the organometallic salts extreme pressure anti-wear additives can be divided into the following categories: 1) metal dialkyl dithiocarbamates, 2) dialkyl dithiophosphate, 3) Polymers containing active metal elements (mainly EDTA water-soluble metal complexes). However, in recent years, environmental regulations have become increasingly stringent, and the demand for ashless lubricant additives has been increasing. Therefore, lubricant additives containing metal elements are increasingly challenged.

ZDDP oil additive has many functions such as anti-oxidation, anti-corrosion, extreme pressure, anti-wear, and so on. Since the middle of the 20th century, it has been an indispensable additive component in oils such as internal combustion engine oils and widely used in petroleum.

Organic molybdenum has excellent tribological properties and occupies a significant position in lubricating materials. Organic molybdenum-based additives have various functions such as anti-wear, anti-friction, extreme pressure, and anti-oxidation, which have attracted full attention from academia and industry. Experiments show that MoDTC has good intense pressure anti-wear performance, especially ZDDP shows a perfect anti-wear synergy effect.

5. Nano oil additive

With the rapid development of nanotechnology and surface analysis technology, many scholars expect to use nanoparticles as a breakthrough in the event of new lubricant additives. Nanomaterials used as additives for lubricants are mainly of the following categories: (1) layered inorganic substances such as graphite, MoS2, etc .; (2) nano soft metals such as Cu, Al, Ni, etc .; (3) nano Oxides, such as Al2O3, ZnO, etc .; (4) compounds containing active element S, such as PbS, ZnS, etc .; (5) inorganic borate salts, such as Cu3 (BO3) 2, Ni3 (BO3) 2, etc .; (6) Rare earth compounds, such as rare earth fluoride LaF3, rare earth oxide La2O3, CeO2, and rare earth hydroxide La (OH) 3. Unique earth compounds have great potential for development as lubricant additives. They have the advantages of high-temperature resistance, good oil solubility, and low pollution. Therefore, new multifunctional rare earth organic sophisticated additives have been continuously developed.

With the increase of people's awareness of environmental protection and the increasingly stringent environmental regulations, the development trend of new extreme pressure anti-wear additives in the future is as follows: 

(1) Without reducing the excessive pressure anti-wear performance, improve its thermal oxidation stability and reduce Phosphorus consumption to extend its service life is the development direction of extreme phosphorus pressure anti-wear agents;

(2) To find out the compounding rule and mechanism of other absolute pressure anti-wear agents, and to develop a boron-containing agent with hydrolytic stability is the development direction of intense boron pressure anti-wear agents;

 (3) Application of green synthesis method to obtain multifunctional nitrogen-containing heterocyclic derivative lubricant additives with high yield, low cost, and ideal effects; meanwhile, in-depth research on its friction mechanism using new characterization methods is nitrogen-containing heterocyclic The development direction of ring lubricant additives;

(4) As an emerging technology, the nano oil additive solves its agglomeration and cost problems, and research on the compounding rule with conventional additives in lubricating oil is the development direction of nanoparticle extreme pressure anti-wear agents.

Infomak is dedicated to the technology development of special oil additives, combined the Technology of nanomaterials developed dry lubricant and oil additives two series. Our products can significantly improve the performance of lubricating oil, improve energy efficiency, effectively protect the lubrication device and extend the oil change cycle, which can satisfy the lubrication oil constantly upgrading for high-end engine oil additives. Contact us.

Engine oil is a very complex oil. Today's high-performance engine lubricants contain a variety of components, such as base oils, the best oil additives, and viscosity modifiers, each of which plays its important role and is balanced to form the final formula.

To ensure that the lubricants perform as required, oil manufacturers must carefully prepare and test each lubricant to meet or exceed specific certification and performance requirements. This article describes the standard components of engine oils, the complexity of their formulations, and the various effects that lubricants must achieve.

Base oil

Let us first discuss base oils. The American Petroleum Institute (API) divides base oils into five categories, each of which has significantly different technical and performance characteristics. Although the base oil is the most significant proportion of heavy vehicle engine oil (usually 60-95% by weight), even the highest quality base oil cannot achieve all-round protection of the engine from high temperatures, Shear force, abrasive particles, chemical dilution, water dilution, and corrosion.

When developing compound additives, formulators must consider the characteristics of the base oils they use, as each base oil has different requirements for oil additives formulations.

Stickiness improver

Viscosity improvers are specially designed polymers used to control the viscosity (thickness) of lubricating oils in specific temperature ranges and working environments. As engine components become more and more sophisticated, advanced polymers not only help the engine operate more efficiently in increasingly harsh environments but also play a key role in improving efficiency, durability, and protection.

A variety of viscosity modifiers have been developed, and the choice of which depends on several related factors, including the operating conditions of the lubricant, the characteristics of the base oil, and oil additives.

Different Oil Additives

Although oil additives are a relatively small component of lubricating oils, they play a significant role in protecting key engine components.

Additives to clean engine

Additives to clean engine-The The engine cleaner additive is used for fuel or oil additives, and its role is to keep engine components clean. In automotive oil formulations, the most commonly used detergents are metal soap salts with sure alkalinity, which can neutralize the acids produced during the combustion process. (keep clean)

Dispersant

The role of dispersant is to suspend pollutants in the oil and prevent the formation of sludge and paint films on engine parts. Dispersants are usually non-metallic ("ashless") substances and are used in conjunction with detergents. (Control of pollutants)

Antioxidants

Antioxidants-Antioxidants are also called oxidation inhibitors. The effect of this low-dose additive is to slow down the oxidation rate of the lubricant. (Slows down oxidation)

Anti-wear additives

The role of anti-wear additives is to form a tough film on highly loaded parts to block contact between metal surfaces. (Reduces engine wear)

Friction Modifier

Friction modifier additive can adhere to the surface of the region and reduce friction and wear when slight conflict occurs. The amount of resistance depends on the smoothness of the contact surface and the pressure between the two surfaces. (Reduces engine wear)

Anti-foam additives

The role of the antifoaming agent is to inhibit the formation of foam in the lubricating oil. Foam can cause cavitation on the pump or reduce lubricant flow. (Reduce cavitation)

Corrosion inhibitor

The role of corrosion inhibitors is to prevent metal surfaces from chemically reacting with water or other contaminants. (Control of corrosion and acids)

Pour point depressant

Pour point depressants can reduce the pour point of a petroleum product, that is, fluidity at low temperature and low shear rate. (Controlling viscosity)

All of the above oil additives must be balanced for the lubricating oil to exert specific effects. Trunnano's formulation experts have professional and sophisticated formulation technology to ensure that all additives, base oils, and vicious agents do not conflict with each other to achieve the efficacy of lubricants jointly.

If the content of one oil additive is high, it may inhibit other oil additives and viscosity improvers from functioning. For example, if the antifoam content is too low, the lubricating oil will foam, cavitating the engine and causing damage. Similarly, if the wrong type of oil cleaner additive is used, the acid in the lubricant cannot be neutralized. Then the dispersant cannot effectively prevent the formation of soot and settle on the engine parts.

Therefore, all oil additives must be blended in precise proportions to work correctly. And Trunnano's expertise in chemistry can do just that. Trunnano's formulation experts know how to formulate professional compound additives to meet a variety of requirements from durability to protection, to achieve excellent fuel economy and efficiency.

Infomak is dedicated to the technology development of special oil additives, combined the Technology of nanomaterials developed dry lubricant and oil additives two series. Our products can significantly improve the performance of lubricating oil, improve energy efficiency, effectively protect the lubrication device and extend the oil change cycle, which can satisfy the lubrication oil constantly upgrading for high-end engine oil additives. Contact us.

The production of grease accounts for a small proportion of the entire petroleum product field. According to a rough estimate, the annual output of oil worldwide is only about 1.16 million tons. Still, it occupies an essential position in the national economy and is necessary for maintaining various machinery and equipment. It plays a vital role in regular operation, reducing friction and wear during surgery, and extending the service life of machinery and equipment. In the field of lubrication engineering, the tribological behavior of grease largely depends on the performance of grease additives. The central role of grease additives is to improve and enhance performance. Often, the addition of different lubricant additives will cause the same grease performance the difference.

Nano science and technology are considered as a new technology facing the 21st century, and its excellent characteristics have attracted widespread attention of scientific researchers. In recent years, nano materials have shown significant application value and broad application prospects in the fields of light, electricity, and magnetism. At the same time, because nano particles have many excellent properties that traditional materials do not have, they exhibit distinctive and superior physics. Chemical properties have entered everyone's horizons. The research on the application of nano materials in grease is relatively smooth.

Previously, some scholars used nano materials as lubricant additives in lubricating oils. It was found that nano materials can be used as friction modifier additives and EP additives, which significantly promoted the reduction of friction and abrasion resistance and the carrying capacity of lubricants. The traditional lubricant additives currently in use have limitations in many aspects, so nano oil additives have been discovered by tribological researchers as a new type of the best oil additives for grease.

The advantages of nano particles as the best oil additives

(1) Nano particles have strong diffusion and self-diffusion capabilities, and it is easy to form a permeation layer or a diffusion layer with excellent abrasion resistance on the metal surface to achieve the anti-friction effect.

(2)Nano particles have the characteristics of small particle size, and they are approximately spherical. They can roll between friction pairs and play a role similar to "ball bearings". The form of friction changes from sliding friction to running friction, making friction The coefficient is reduced; (3) Nano particles can polish and strengthen the friction surface to support external loads and improve the carrying capacity.

Types of nano lubricant additives

(1)Nano elements grease additives

Professor Wang Peng and others investigated the tribological properties of the nano bismuth powder. They found that the quality of nano bismuth powder and the serpentine powder was studied using four-ball friction and abrasion tester under the condition that the total content of the fixed powder was 3% The effect of the ratio on the tribological properties of lithium-based greases. The results show that mixing the nano bismuth powder with serpentine powder as an additive is beneficial to improve the comprehensive tribological properties of lithium-based lubricants. When the mass ratio of the two powders is at 3:1, the composite lithium-based oil has the best tribological features and the best anti-friction and anti-wear effect.

As a transition element, copper has many outstanding characteristics in terms of physical and chemical properties, such as excellent corrosion resistance and mechanical properties, which makes it suitable for the environment in which grease is used. Researchers have found that adding an appropriate amount of nano copper to oil, and adding this grease to friction parts, has excellent anti-friction and anti-wear properties. After observation, it was found that a thin film with friction-reducing and the lubricating effect was formed on the surface of the friction pair, and the nano copper added at the same time would deposit to achieve the purpose of repairing the micro-scratch on the surface of the friction pair, which could significantly reduce the friction and wear of the friction pair.

Dr. Choi added nano copper powder to lithium-based grease. The test results show that nano copper can reduce the friction coefficient and reduce the wear on the friction surface.

Graphene is called "magic material" and has a strange and excellent performance in many fields. From the perspective of tribology, graphene is an excellent lubricating material, which can significantly reduce the friction coefficient and wear rate of friction pairs. Singh et al. Added graphene lubricant to lithium-based grease and tested its tribological properties. It was found that when its mass fraction is 0.4%, the friction coefficient, noise, and vibration of the friction pair are small, and pure grease without additives In comparison, the friction coefficient can be reduced by 30% when pure rolling friction occurs, and the friction coefficient can be reduced by 20% when mixed rolling and sliding friction occurs.

(2)Sulfide nano particles as grease additives

Tungsten disulfide is used as a new type of dry lubricant because of its particular layered hexagonal structure, which is liable to slip between layers, which makes it excellent in lubricating performance and low coefficient of friction. Professor Chen and others added the prepared nano tungsten disulfide powder to lithium-based grease and examined the tribological properties of the lithium-based oil. The results show that the added nano tungsten disulfide powder can significantly improve the tribological properties of lithium-based lubricants. During the friction process, nano tungsten disulfide powder generates adsorption deposition on the surface of the friction pair. Under high temperature and high load conditions, a chemical reaction film containing Fe2O3, FeSO4, WO3, and Fe3O4 is formed, which together produces a lubricating effect.

MoS2 has excellent lubricating properties. It has unique tribological features in harsh environments such as high vacuum, intense radiation, and high and low temperature. It can be used as aerospace grease additives. Cheng Yazhou et al. Prepared nano MoS2 powder and added it to the grease to conduct tribological performance tests. The test results show that the addition of a small amount of nano MoS2 powder has a significant effect on the extreme pressure performance and anti-friction and anti-wear properties of the grease. Influence, the result is pronounced.

In summary, nano lubricant additives have excellent application prospects in greases. In the future, nano-grease additives need to solve the problem of dispersion stability of particles, and they are developing in the direction of "green chemistry," laying a solid foundation for the large-scale practical application of nano-grease additives.

Infomak is dedicated to the technology development of special oil additives, combined the Technology of nanomaterials developed dry lubricant and oil additives two series. Our products can significantly improve the performance of lubricating oil, improve energy efficiency, effectively protect the lubrication device and extend the oil change cycle, which can satisfy the lubrication oil constantly upgrading for high-end engine oil additives. Contact us.

What is molybdenum disulfide?

MoS2 is an inorganic compound that naturally occurs in the mineral molybdenite. The crystal has a layered hexagonal structure similar to graphite. Molybdenum disulfide is known as the "king of high-grade dry lubricant." Molybdenum disulfide is a solid powder made by chemically purifying natural molybdenum concentrate powder after changing its molecular structure. The color of this product is slightly silvery gray, with a metallic luster, and it has a smooth feel when touched. It is insoluble in water. The product has the advantages of excellent dispersibility and non-sticking. It can be added to various greases to form a non-sticky colloid state, which can increase the lubricity and extreme pressure of the lubricant. It is also suitable for high-temperature, high-pressure, high-speed, and high-load mechanical working conditions to extend equipment life.

Molybdenum disulfide properties

The MoS2 melting point is 1185 ℃, but it begins to sublime at a relatively low temperature of 450 ℃. This property is useful for purifying compounds. Due to its layered structure, hexagonal MoS2, like graphite, is an excellent dry lubricant. It and its tungsten disulfide can be used as mechanical parts (for example, aerospace industry), two-stroke engines (types used for motorcycles), and surface coatings in the barrel (to reduce the friction between bullets and ammunition).

Unlike graphite, the lubrication performance of moly powder does not depend on the adsorbed water or other vapors. It has a maximum temperature of 350 ° C in an oxidizing environment and 1100 ° C in a non-oxidizing atmosphere. Its stability makes it suitable for high-temperature applications where grease is not practical.

It is understood that MoS2 is recognized as the best dry powder lubricant in the world. Still, in the application of lubricating oil, the physical diameter of molybdenum particles is large, which will form a precipitate layer in the engine oil and cannot be evenly fused with the engine oil. Among the greases, this makes the manufacture of molybdenum disulfide lubricants a global problem. Only a few companies in Germany and the United States currently master this technology. China also has many methods available in the field of making molybdenum sulfide grease.

What is molybdenum disulfide grease?

Moly disulfide grease contains solid, semi-fluid, and fluid lubricant of molybdenum disulfide. It has excellent lubricating properties for mechanical friction parts working in extreme-pressure environments but does not have excellent high-temperature resistance. Moly disulfide grease is a molybdenum disulfide extreme pressure grease refined by inorganic thickener thickened synthetic ester oil, containing molybdenum disulfide solid lubricant and various oil additives such as anti-oxidation and anti-corrosion. This high temperature and high-pressure grease are designed for the lubrication of bearings and moving devices under high temperature, high load/impact load, etc., providing long-term anti-wear and corrosion protection.

What is the maximum operating temperature of molybdenum sulfide grease?

First of all, the quality of molybdenum sulfide grease is different between different brands and different brands, so the maximum use temperature is also different. The general-purpose molybdenum sulfide grease has a temperature range of -20-120 ℃.

What is molybdenum disulfide grease used for?

1. Under high speed, low speed, heavy load or impact load, it is easy to increase the friction between the gears, resulting in wear and other damage, and molybdenum disulfide grease has excellent extreme pressure and wear resistance, can quickly form an oil film on the equipment, reduce Friction and wear, and has a high load-carrying capacity to prevent gluing, thereby protecting the gear unit.

2. When the gear is running, the grease will be agitated violently, the temperature is also higher, and it will contact with air and water vapor, which will accelerate the oxidation speed of the grease, make it deteriorate, and lose the lubrication effect. Molybdenum disulfide grease has excellent oxidation stability, is not easy to generate various precipitates, and can provide long-term lubrication effect for gears.

3. Speeds are often exposed to moisture during operation. If the water resistance and rust resistance of the grease is not excellent, with the participation of water and oxygen, the tooth surface and gearbox will corrode and rust, which will damage the regular operation of the gear. Molybdenum disulfide grease can solve this problem because it does not dilute or emulsify even underwater or other environments, protect the equipment from corrosion and provide adequate lubrication.

Disadvantages of Moly disulfide grease

1. Moly disulfide grease can not be mixed with other lubricants, it will reduce the performance or failure;

2. Moly disulfide grease is not suitable for high speed, light load, and low temperature. Use temperature does not exceed 190 degrees;

3. Molybdenum disulfide has a high content of active sulfur, which is easy to cause corrosion to copper. Besides, when parts made of copper and its alloys need to be lubricated, it is not impossible to choose molybdenum disulfide-containing lubricating products, but it is also necessary to add copper corrosion inhibitors;

4. Molybdenum disulfide must not be mixed with engine oil, physical and chemical reactions will occur, causing grease failure.

Advantages of Molybdenum sulfide grease

1. Long service life

Compared with ordinary grease, molybdenum sulfide grease has more excellent oxidation stability, lubricity, mechanical safety, and extremely low volatility. Even under low temperature, it is not easy to harden or produce deposits, and the service life is long.

2. Reduce noise and meet environmental protection requirements

Moly disulfide grease does not contain silicone, which can avoid contact point failure, effectively reduce the noise from plastic gears, and also has a small seepage flow. It can be used in places where cleanliness is required. The base oil is non-toxic and tasteless and meets environmental protection requirements.

3. Wide range of uses

Molybdenum sulfide grease is suitable for the lubrication and protection of high-speed bearings, gears, chains, and other transmission devices in automobiles, electrical equipment, precision equipment, audio-visual equipment, office equipment, textile, printing and dyeing, metallurgy, mining and other industries with plastic components.

4. Outstanding anti-wear performance

Anti-friction: The particle size of molybdenum disulfide produced by supersonic airflow crushing reaches 325-2500 mesh, micro-particle hardness 1-1.5, friction coefficient 0.05-0.1, so it can be used in friction materials to reduce friction.

Infomak is dedicated to the technology development of special oil additives, combined the Technology of nanomaterials developed dry lubricant and oil additives two series. Our products can significantly improve the performance of lubricating oil, improve energy efficiency, effectively protect the lubrication device and extend the oil change cycle, which can satisfy the lubrication oil constantly upgrading for high-end engine oil additives. 

If you are looking for molybdenum disulfide , please feel free to contact us. 

1. Crystal structure and lubrication mechanism of tungsten disulfide WS2

The crystal structure of WS2 is a typical hexagonal crystal layered structure. Each layer is composed of two layers of hexagonal sulfur atoms sandwiched by a layer of metal tungsten atoms, and sulfur atoms and tungsten atoms form a triangular cone shape. The sulfur atoms and tungsten atoms in each segment are connected by strong covalent bonds, and the layers are combined by relatively weak Van der Waals forces. This kind of connection makes the sheet have a substantial sliding property, and sulfur atoms can quickly form physical or chemical adsorption with most metals to create a transfer film. Friction mostly occurs between the lubricating film and the transfer film, so although conflict alone may not occur Wear, and the damaged part of the film layer can be repaired by moving the lubrication film that adheres to the lubricating material and the WS2 debris accumulated on both sides of the friction part. The SEM electron micrograph of the hexagonal layered sheet-like WS2 is shown below.

2. The characters of tungsten disulfide WS2

WS2, as a solid lubricant has significant characteristics in terms of physical properties. In the past, petroleum base oils and greases were most commonly used as lubricants.

In recent years, with the advancement of industrial technology, the demand for new reliable lubrication has increased with the increase in machine output, rotational speed, sliding speed, load, and use in harsh environments such as high temperature and vacuum. It is also essential to maintain a clean atmosphere and protect the environment.

The oxidation temperature of WS2 is about 100℃ higher than that of molybdenum disulfide (MoS2), which has an excellent heat resistance and extreme pressure performance, and has a low coefficient of friction;

WS2 can resist high surface pressure;

In solid lubricants, its friction coefficient has a tendency to decrease with increasing load;

WS2 also has lubricity at a high temperature of 450℃, which helps prevent sintering or seizure;

WS2 is more resistant to wear;

WS2 can reduce industrial waste and protect the environment;

WS2 has a perfect energy-saving effect;

In addition to reducing energy consumption by reducing the friction coefficient, WS2 can also extend the service life of components, achieve energy saving and reduce costs;

It acts as a lubricant in the temperature range from -273℃ to 450℃ in the air;

WS2 is compatible with most oils and greases;

Compared with graphite, MoS2 and PTFE, WS2 reduces surface deposits by half.

3. Product use examples of tungsten disulfide WS2 

The use of 3-5% WS2 in the brush can effectively extend the life of the brush by 20%-40%; especially suitable for power tools and household appliances, the effect is significant;

The addition of 5-10% WS2 to the graphite mechanical seal ring can effectively reduce the wear rate and extend the life by more than 30%;

WS2 can also be used for mould release agent;

Lubricants for ball bearings and roller bearings;

Engine and driveline components;

Air vibrator, pneumatic motor electrical connector;

Circuit breakers and switches (super electrical contact material additives);

Electric motor

Lubricants for industrial gears and bearings;

Pilot valve, chain saw, etc.;

Rubber gasket, O-ring;

Satellite and aircraft parts;

High vacuum application products;

Cryogenic pump seals, etc.

4. Performance data comparison chart of tungsten disulfide WS2

Although WS2 has a very similar layer structure to graphite and MoS2, its lubricating performance has a particularly special meaning. It has a thicker layer and a more stable molecular structure, which is different from graphite. It is more lubricated under vacuum conditions;

WS2's performance is better than MoS2, and it can continue to lubricate in a wet environment.

Infomak is dedicated to the technology development of special oil additives, combined the Technology of nanomaterials developed dry lubricant and oil additives two series. Our products can significantly improve the performance of lubricating oil, improve energy efficiency, effectively protect the lubrication device and extend the oil change cycle, which can satisfy the lubrication oil constantly upgrading for high-end engine oil additives. 

If you are looking for  WS2, please feel free to contact us.