Production process of complex lithium grease

The thickener system of the complex lithium grease is formed by the co-crystallization of lithium soap of fatty acid and lithium salt of low molecular acid, so that the dropping point of the prepared grease is more than 260. According to the different low molecular acids used, the thickeners of the complex lithium grease mainly include 12-hydroxystearic acid azeladiic acid system, 12-hydroxystearic acid monosebacic acid system, 12-hydroxystearic acid monoboric acid system, 12-hydroxystearic acid monophosphate system, 12-hydroxystearic acid monosalicylic acid system, 12-hydroxystearic acid monosebacic acid monoboric acid system, etc. The thickener system is different, and the production process is different.

In China, due to the relationship between raw materials, the production of complex lithium grease mainly uses 12-hydroxystearic acid and sebacic acid system, and a small part uses 12-hydroxystearic acid and boronic acid system. For the production of 12-hydroxystearic acid-sebacic acid complex lithium grease, the production process of atmospheric pressure reactor-mixing kettle method and pressure reactor-mixing kettle method is mainly adopted. The production process is similar to that of lithium-based grease, except that there is a composite process of saponification and heating.

Therefore, there is a one-step method and a two-step method in the production process.

1) Three-fold stirring atmospheric reactor - mixing kettle method one-step production process.

The one-step process of producing complex lithium grease from triple stirring atmospheric reactor and mixing kettle mainly includes the following processes:

1) Feeding In the saponification reaction kettle, part of the base oil, 12-hydroxy fatty acids, sebacic acid is added, and the temperature is raised to 90-95.

2) Saponification and compounding At 90-95, slowly add lithium hydroxide aqueous solution to the reactor (dissolve lithium hydroxide with 5-6 times water), the material of the reactor becomes significantly thicker, and when the temperature is above 100, the speed of adding lithium hydroxide aqueous solution can be increased.

In this process, the addition temperature and speed of the aqueous solution of lithium hydroxide are the key stages in the production of complex lithium grease.

When the addition rate of lithium hydroxide aqueous solution is close to or slightly higher than the evaporation rate of water at this temperature, it is conducive to the combination of lithium 12-hydroxystearate soap and lithium sebacate salt.

After the lithium hydroxide aqueous solution is added, the reaction kettle is heated up, and the compounding process is completed at a constant temperature of about 135 for 10 to 30 minutes.

The rest of the processes include heating, quenching, post-treatment and other processes, which are the same as the production of lithium-based grease in atmospheric reactors.

2) Triple stirring pressure reactor - mixing kettle method one-step production process.

The schematic diagram of the one-step production process of complex lithium grease by triple stirring pressure reactor and mixing kettle is shown in the figure below.

If you don't know this kind of expertise, you can consult an engineer from Krupp Kulbe or Shanghai Tiger Head Hotolube.

Send some of the several models on the Xu Gong Group manual:

Bearing grease, the common model is Kluber BE41, Shanghai Hutou Hotolube's fully synthetic high-temperature motor bearing grease, fully synthetic high-temperature high-speed bearing grease, high-temperature heavy-duty bearing grease.

Grease for low-temperature equipment, commonly used models are Shanghai Tiger Head Hotolube's fully synthetic low-temperature aviation grease, Kluber's fully synthetic ultra-low temperature grease, etc.

Grease for high-temperature equipment, the common model is Klüber BE41, the fully synthetic ultra-high temperature grease and long-lasting high-temperature grease of Shanghai Hutou Hotolube.

Ultra-high temperature anti-cake, commonly used models: Shanghai Tiger Head Hotolube's fully synthetic ultra-high temperature anti-cakeback and golden butter, Dr. Bosh's LOP762.

Fluorine-containing white grease, commonly used models: Shanghai Tiger Head Hotolube's fully synthetic fluorogrease and fluorosilicone grease, Dr. Bosh's SJ92.

Hello! I can teach you the recipe for the oil.

Lithium-based grease is made from natural fatty acids (stearic acid or 12-hydroxystearic acid) lithium soap, thickened with medium-viscosity mineral lubricants or synthetic lubricants, while synthetic lithium-based greases are made from synthetic fatty acid lithium soap, thickened with medium-viscosity mineral lubricants.

Main components.

1) Base oil. Base oil is the dispersion medium in the grease dispersion system, which has a great influence on the performance of the grease.

2) Thickener. The thickener is an important component of grease, and the thickener is dispersed in the base oil and forms the structural skeleton of the grease, so that the base oil is adsorbed and fixed in the structural skeleton. The water and heat resistance of greases is mainly determined by thickeners.

3) Additives. A class of additives is unique to grease, called glue solvents, which make the combination of oil soap more stable, such as glycerin and water.

For detailed formula ratio, please contact Qingdao Kebiao for analysis.

Are you going to do this now? I've got someone in charge of that, so I can talk about it.

These two things have different names, and there must be subtle differences in function, both are lithium-based, but the composite effect is stronger than that of lithium-based, let me give you a detailed answer.

Production process. 1.Three-component composite lithium grease production process.

The grease is in a grease tank, and 12-hydroxystearic acid, sebacic acid and base oil are heated to 85 to participate in the saponification reaction of lithium hydroxide aqueous solution. Add 10% boric acid after dehydration. Then the temperature is raised to 210 220 within 2 hours, cooling oil is added to cool down, and then the products are prepared after homogenization and additives.

Two-component composite lithium grease production process.

In the base oil, which accounts for 60% of the total, 12-hydroxystearic acid and sebacic acid are involved, respectively, which are dissolved and stirred evenly. Below 100 105, slowly participate in the reaction of 10% lithium hydroxide solution, and insist on about 60min. After saponification, the temperature is heated and dehydrated, and the maximum temperature is 210 220

Cooling and cooling oil are cooled, homogenized, additives and other processes are added to obtain products.

2.One-step saponification process of contactor.

3.In recent years, contactors have been widely used to prepare complex lithium greases. The process flow of contactor preparation of complex lithium grease is:

The specified amount of base oil and all amounts of fatty acids, diacids, lithium hydroxide participate in the contactor, saponification at a higher temperature, control the pressure to, the maximum temperature is 210 220, gradually dehydrate after the saponification is completed, use a pump to mix the material and the quantitative quenching oil through quenching and transfer to the harmony tank, when the temperature in the kettle reaches 150 160, the cyclic shearing is carried out under pressure, when the temperature drops to 95 100, the implementation of degassing disposal, filtration to obtain products.

The production cycle of the contactor method is 6 times that of the atmospheric tank method in the same hour, and the production time per ton of product is shortened compared with the atmospheric tank, which shows the superiority of the contactor process.

The unevenness of the dropping point is the basis for measuring the compounding effect of the lithium grease complex. Regarding the preparation of complex lithium grease with contactors, the main elements are water addition, heating rate, saponification time, etc.

The difference between these two medium-fat fats is actually quite large. I'll tell you briefly. First of all, although both use lithium as a thickener, the production process is very different (not much explanation).

The complex lithium process is much more complex and much more expensive. Moreover, the use of the two is still very large. In addition to basic lubrication and anti-oxidation, the main function of ordinary general-purpose lithium grease is waterproof and anti-rust.

It is mainly used in general mechanical maintenance. In addition to the waterproof and anti-rust functions of general lithium grease, there are good high-temperature types, mechanical safety and colloidal safety, mainly suitable for the lubrication of high-temperature friction parts in metallurgical and mining equipment. When the landlord chooses, it depends on your use.

I don't know if I can help you.

Composite lithium grease is an enhanced version of ordinary lithium grease, the basic characteristics are the same, lithium grease compression resistance is better than calcium base, calcium grease water resistance is better than lithium grease, complex lithium grease is generally a combination of the advantages of the two, can also add a little graphite powder to improve temperature resistance, but it is not a special oil.

It is estimated that the difference is not big, it should be better than the lithium-based one.

Looking for industrial grease, send you the industrial grease model in the Xu Gong equipment maintenance manual:

A Bearing grease, the common model is Kluber BE41, Shanghai Hutou Hotolube's fully synthetic high-temperature motor bearing grease, fully synthetic high-temperature high-speed bearing grease, high-temperature heavy-duty bearing grease.

b Grease for high-temperature equipment, the use temperature is above 250 degrees Celsius, such as drying equipment, steel equipment, kiln cars, glass industry, etc., the common model is Kluber BE41, Shanghai Hutou Hotolube's fully synthetic ultra-high temperature grease and long-lasting high temperature grease.

c Grease for low-temperature equipment, the use temperature is below -30 degrees Celsius, or even -60 70 degrees, the commonly used models are Shanghai Tiger Head Hotolube's fully synthetic low-temperature aviation grease, Kluber's fully synthetic ultra-low temperature grease, Jetlube's KS90, etc.

d Fluorine-white grease is used for parts with low speed to lubricate and seal. Common models: fully synthetic fluorolipids and fluorosilicones from Shanghai Tiger Head Hotolube, GLK 112 from Kluber and SJ92 from Dr. Bosh.

The basic raw materials used in the production of lithium-based greases include animal and vegetable fats and fatty acids. Lithium hydroxide, base oils and various additives added to improve certain properties of greases.

China has abundant raw materials for the production of lithium-based grease, and China's lithium reserves rank first in the world, accounting for 47% of the world's reserves; China's castor oil production accounts for the second place in the world, second only to Brazil, and India, so China has very favorable conditions for the development of lithium-based grease production.

Fat materials: The quality of fat materials used in lithium grease has a direct impact on the quality of lithium grease. Many different fats and fatty acids can be used to make lithium-based greases, but the carbon chain length of fats and fatty acids is closely related to the properties of the finished lithium-based grease. Although the oil separation volume of the product prepared from long-chain fatty acids is small, the thickening capacity is very low.

It is generally believed that the mixed acid of 18 and 16 carbon and 12-hydroxystearic acid of 18 carbon are the most suitable as fat raw materials for the production of lithium-based grease.

Lithium hydroxide: In the process of preparing lithium-based grease, when lithium hydroxide and fatty acids react, an aqueous solution of lithium hydroxide can be used, and when preparing an aqueous solution of lithium hydroxide, 1 part of lithium hydroxide is generally dissolved in water, and then heated to 70 80, and stirred until the lithium hydroxide is completely dissolved.

Commonly used additives: The additives commonly used in lithium-based greases are similar to other greases, but lithium-based greases use a wider range of additives and have good compatibility with many additives. Commonly used additives mainly include antioxidants, metal surface passivators, preservatives, structural improvers, extreme pressure anti-wear agents, color stabilizers, and wire drawing enhancers.

Base oil: Lithium-based grease has good compatibility with base oil, and there are many types of base oil that can be used, including mineral base oil, synthetic hydrocarbon base oil, silicone oil, ester oil, etc. This is because lithium soaps are more tolerant than other soap bases to changes in aromatic, alkane and naphthenic content in base oils and are able to form grease structures.

The characteristics of lithium-based grease are as follows:

1) Lithium-based grease, especially the grease thickened with lithium 12-hydroxystearate, has only two phase change temperatures, the first phase change temperature (i.e., from pseudo-gel state to gel state) is generally above 170, and the second phase change temperature (i.e., from gel state to sol state) is generally above 200, therefore, when a suitable mineral oil is selected, it can be used for a long time at 120 or short-term use to 150.

2) Lithium-based greases, especially those thickened with lithium 12-hydroxystearate, can be seen by electron microscopy that their soap fibers form double-stranded, tangled twisted bands, so they have good mechanical stability.

3) The adsorption heat of alkanes by lithium 12-hydroxystearate and lithium stearate was determined by gas chromatography, and it was found that the binding strength of lithium 12-hydroxystearate and lithium stearate to the liquid phase on the surface of soap fibers and the binding strength to the liquid in the crystal lattice were larger, so the lithium-based grease had good colloidal stability.

4) The solubility of alkali metal in water is small, so lithium-based grease has good water resistance and can be used in wet and water-contact mechanical parts.

Lithium-based grease is made from natural fatty acid lithium soap, thickened with medium-viscosity mineral lubricants or synthetic lubricants, while synthetic lithium-based greases are made from synthetic fatty acid lithium soaps, thickened with medium-viscosity mineral lubricants. Lithium-based grease, especially the lubricating grease thickened with 12-suspected lithium stearate soap, becomes a multi-effect long-life general grease after adding antioxidant chemical agent, rust inhibitor and extreme pressure agent, which can replace calcium-based anti-lubrication grease and sodium-based grease for bearing lubrication of aircraft, automobiles, tanks, machine tools and various mechanical equipment.

Lithium-based greases, especially greases thickened with lithium 12-stearate, have only two intersection temperatures, the first intersection temperature (i.e., from pseudo-gel state to gel state) is generally above 170, and the second phase transition temperature (i.e., from gel state to sol state) is generally more than 200 per cent, so when a suitable mineral oil is selected, it can be used for a long time at 120 or short-term use to 150.

Lithium-based greases, especially those thickened with lithium 12-stearate, can be seen by electron microscopy in the form of double-stranded, tangled twisted bands of soap fibers, and therefore have good mechanical stability.

The adsorption heat of alkanes by 12-lithium stearate and lithium stearate was determined by gas chromatography, and it was found that the binding strength of lithium 12-top lipate and lithium stearate to the liquid phase on the surface of soap fibers and the binding strength to the liquid in the crystal lattice were larger, so the lithium-based grease had good colloidal stability.