How to solve the problem of hardening of grease

Reasons for grease hardening: (1) The high temperature resistance is not enough, and the cherry blossoms or carbonization after oxidation; (2) Poor quality mineral oil is used, which volatilizes quickly; (3) Too much filler is added to the grease.

A good high-temperature grease generally chooses synthetic base oils, synthetic hydrocarbons, esters and even silicone oils and fluorine oils. The commonly used models of high-temperature grease are:

a Dr. Bos's HS201, 260 degrees;

b Fully synthetic long-lasting high-temperature lipid of Shanghai Tiger Head Hotolube, 300°C; Tiger head hotolube's fully synthetic ultra-high temperature grease and ultra-high temperature anti-jam grease, 1300 degrees;

c Krupp HP260, 1100 degrees.

1. Look at the production date.

The storage time of grease should not be too long, generally should choose the grease with a shelf life of no more than one year, and the grease with a shelf life of more than one year should be used only after passing the inspection.

2. Look at the appearance.

Different types of grease come in different colors, but no matter what color the grease is, it should be a viscous and uniform paste. If the grease has different shades of color or the epidermis is hardened, there is a lot of oil slick on the surface of the grease or the consistency is significantly smaller, or the surface of the grease emulsions and turns white due to water mixture, etc., these are signs that the grease has deteriorated and cannot be used.

3. Smell the smell.

If you smell a distinct rancid smell of grease when you open the package, it is a sign that it has deteriorated and cannot be used.

4. Twist by hand.

When twisting the grease without filler by hand, it feels smooth and has no awkward feel; Otherwise, it may be that the thickener is unevenly dispersed or mixed with impurities, and the lipid should not be used. However, grease with filler powder is slightly awkward.

5. Burn with fire.

Pick up a piece of grease with iron wire, and then burn it with a lighter, if the grease softens and drips, it indicates that the dropping point is too low quality grease and should not be used. Because the temperature of the lighter flame does not exceed 120 130, and the dropping point of most grease exceeds this temperature, it will not drip when burned with a lighter. It should be noted that this method can only identify inferior greases with low dropping points.

6. Bask in the sun.

Take a piece of grease and put it in a cup, dry it in the sun for a day or two, if the fat body changes greatly, there is oil separation or discoloration, indicating that the performance of the grease is unstable and cannot be used.

7. Water addition method.

Take a small amount of grease and put it in a cup, add a few drops of water on it, and then stir it with a glass rod, if it appears cloudy and white, it indicates that the grease is easy to emulsify, not anti-water and lipid.

It can be cleaned with gasoline, toluene or carbon tetrachloride solvents, and the most convenient way is to use dish soap.

Here's how:

1. Grease stains are commonly known as oil stains, which are insoluble stains in water. Gasoline is an organic solution, which can dissolve oil and other substances, soak the cloth in gasoline for five minutes, and wash it directly in clean water, you can see that the butter is easily washed and there is no residue.

2. It can be scrubbed with toluene or carbon tetrachloride solvent, and the traces left can be removed with a mixture of alcohol and ammonia, or with alcohol soap.

3. Boil water, pour it into a basin when the water temperature reaches about 80%, and soak the greasy part of the clothes in warm water. Soak in warm water for about 10 minutes and drop a few drops of dish soap. Because it is an oil stain, it will work faster with dish soap.

Gently lather it a few times, and you will find that most of the original greasy has been washed off. Wash it again with clean water, leaving a little grease stain. Then squeeze a little toothpaste and apply it to the remaining grease stains.

A few more rubs and you're done.

A little bit clear, you can also look for the reason for curing to see if there is a way.

Grease is a thick, greasy, semi-solid. It is used for the friction part of the machine, which plays the role of lubrication and sealing. The grease can adhere to the vertical surface at room temperature without loss, and can work in open or poorly sealed friction parts, with irreplaceable holding points of other lubricants.

Therefore, grease is used as a lubricating material in many parts of automobiles and construction machinery, but many greases will dry out after a long time, and the grease will dry out.

What are the reasons for hardness?

1. The grease is contaminated: dust, dirt, floating dust and similar impurities, which will cause the grease to dry out. In the use of grease, foreign impurities should be prevented from entering the lubrication system, which will not only affect the performance of the grease, but also cause wear and tear to the machine.

2. Incompatibility between greases: have you ever paid attention to what type of grease you add each time when changing the oil? Are the grades the same? Is it the same product of the same brand? If you don't pay attention to these, then you are likely to get shot.

3. Base oil.

Oxidation: The grease used has poor oxidation resistance.

4. High temperature of machine parts: such as too much grease filled with bearings, overheating caused by mechanical conditions (improper installation, excessive load, etc.), insufficient lubrication may cause overheating problems in machine operation.

5. Vibration and centrifugal force.

If the grease is subjected to prolonged vibration or centrifugal force, the oil separation will also be exacerbated. If a suitable grease is not used, centrifugal force can spin off the base oil in the grease.

6. Exposure to special physical or chemical conditions: grease is exposed to chemicals, radiation, some chemical salts, etc.

High temperatures and heat, which may be caused by machine use or other reasons, will cause the base oil to be lost from the thickener and accelerate the oxidation of the oil. Some models: (1) Grease for high-temperature equipment, the use temperature is more than 300 degrees Celsius, and the models are:

Shanghai Tiger Head Hotolube's fully synthetic long-lasting high-temperature lipids, 300 degrees or fully synthetic ultra-high temperature fats, JD20 of Boshi.

2) Ultra-high temperature anti-grazing grease, model: Shanghai Tiger Head Hotolube's fully synthetic ultra-high temperature anti-caulking grease and golden butter.

3) Grease for high load resistance, models include fully synthetic molybdenum disulfide high temperature grease of Shanghai Tiger Head Hotolube, Fored KLS820, etc.

There are basically three reasons why the grease hardens:1Bearings with large radius and high speed will generate high centrifugal force, which will cause the grease to separate the oil, which will lead to the hardening of the grease; 2.

High temperatures and heat caused by equipment use or other reasons will lead to excessive loss of base oil from the thickener and accelerate the oxidation of the oil, which is the most common situation. If your machine is running at high temperatures, consider using a high-temperature grease such as Shell GADUS S3, depending on the operating conditions.

3.In addition, poor sealing of the bearing can also lead to oil loss.

It should be that you did not choose the correct grease according to the practical situation and conditions, because there are many types of it, and it must be selected correctly according to the use conditions before it can really play a role.

Let's take a look at it first.

There are many reasons for the hardening of grease: first: the grease is not selected correctly, the working environment does not match the applicable working environment of the oil (such as the viscosity index), and the dilution of the base oil means that the base oil is separated from the thickener, and it will naturally become harder; Second:

The incorporation of impurities, in the process of use, the use of the environment with too many impurities will also cause the lubrication performance of the oil to be reduced, affect the normal operation of the equipment, heating, in turn, because the temperature of the equipment rises, the grease base oil is diluted, and the grease becomes harder.

Glyceryl palmitate (oleic acid) is hydrogenated to produce glyceryl stearate, also known as hydrogenation of grease When the grease hardens, the liquid state becomes solid.

It may be that the model selected is not right, and the temperature and working conditions applicable to each model are different, so you must consult a professional person before choosing.

What kind of working conditions? What grease?

Good afternoon, grease because the main component is saturated alkanes have a fixed boiling point, they will slowly volatilize under normal temperature conditions, whether it is their own molecules or as a diluent solvent oil, resulting in a continuous increase in viscosity, after a long time of agglomeration, oxidation and discoloration and hardness increase is normal, please refer to. Grease generally needs to be stored in a closed container protected from light and heat.

The oil separation performance is not good, and long-term storage will lead to grease cracking, oil separation, and hardening.

Probably, it depends on the production process of the product, the type and content of impurities, the storage conditions and other factors.

Because the lubricating oil film is subjected to external forces for a long time, the molecular chain structure will also change. Extreme pressure causes changes in the structure of the molecular chains.

Grease is a stable semi-solid product formed by dispersing a thickener in a liquid lubricant, which can be added.

into additives that improve some of its properties.

Grease composition.

Grease consists of thickeners, liquid lubricants, additives.

Thickener: It can be dispersed in the liquid lubricant and form a spatial network structure, which can effectively adsorb and fix the liquid lubricant. The thickener accounts for 2 30 of the grease, which determines the mechanical stability, high temperature resistance, colloidal stability, water resistance, etc. of the grease.

Liquid lubricant: It is the dispersion medium of thickener in grease. Liquid lubricants account for 70 98 grease, which determines the lubricity, evaporation, low temperature and compatibility with sealing materials of the grease.

Additives: substances that are added to greases to improve certain performance in use. According to the performance of the required grease, structural improver, antioxidant, metal passivator, rust inhibitor, extreme pressure agent, oily agent, anti-wear agent, wire drawing agent, etc. can be added.

Grease hardening is basically caused by high temperature and heat caused by equipment use or other reasons, which will lead to excessive loss of base oil from the thickener and accelerate the oxidation of the oil, which is the most common situation. If your machine is running at a high temperature, consider the following models:

a) Grease for high-temperature equipment, the use temperature is more than 300 degrees Celsius, such as drying equipment, cement equipment, kiln cars, induced draft fans, etc., the common ones are Shanghai tiger head hotolube fully synthetic long-lasting high-temperature grease, 300 degrees or fully synthetic ultra-high temperature grease, 1300 degrees,.

b) Ultra-high temperature anti-jam grease, used for lubrication and assembly of high-temperature working conditions to prevent sticking and sintering parts. Commonly used are the fully synthetic ultra-high temperature anti-seizure grease and golden butter of Shanghai tiger head hotolube.

c) Grease for high load resistance, commonly used is the fully synthetic molybdenum disulfide high-temperature grease of Shanghai Tiger Head Hotolube.

d) Sealing lubricating grease, used for parts with low rotational speed, playing the role of lubrication and sealing. Commonly used are the fully synthetic high-temperature sealing grease and fluorosilicone grease of Shanghai tiger head hotolube.

1. Bearings with large radius and high speed will produce high centrifugal force, which will cause the grease to separate the oil, resulting in the hardening of the grease.

2. The high temperature caused by the excessive use of the equipment, or the high heat caused by other reasons, will also make the grease hard. Whatever the cause, heat can cause excessive oil loss from the thickener and can accelerate oil oxidation, which can harden the grease in the bearing.

3. In some cases, the service life of the grease is too long, and it will harden.