What grease is used for low temperature operating environment below -40℃?

February 06, 2024

What grease is used for low temperature operating environment below -40℃?

1. What is low temperature grease?

Low-temperature grease refers to the grease that can still achieve a good lubrication function at a low temperature (generally referred to as a low-temperature environment below -24 ° C in the industry).

Low temperature grease mainly contains two meanings:

First, the extreme low temperature that can be tolerated;

The second is whether the lubrication performance of the grease is excellent at low temperature.

The most important factor affecting the minimum temperature of a grease is the type of Base Oil.

The low temperature limit of mineral oil is -30℃;

The lowest temperature of the synthetic oil of polyether can reach -40℃;

Polyolefin and synthetic ester oil at about -60℃;

The lowest temperature of silicone oil is -70℃;

Perfluoropolyether has the best low temperature, which can reach -90 ° C, which is almost the limit temperature of grease.

The low temperature performance of greases is generally expressed by similar viscosity and low temperature torque.

Similar viscosity is the ratio of shear stress and shear rate of a non-Newtonian fluid flow. Obviously, the lower the low shear rate and the higher the similar viscosity, the greater the shear stress will be. Under normal circumstances, we determine the low temperature use limit of grease according to the allowable value of similar viscosity of grease at low temperature.

Low temperature torque refers to the degree of retarding the rotation of low speed ball bearings at low temperature. It is obvious that the greater the low-temperature torque, the more difficult the low-temperature start, and the greater the power loss.

2. Ordinary grease and low temperature grease

Ordinary grease generally refers to the use of a temperature between -20 ° C and 120 ° C, which plays a role in lubricating protection.

For users, the difference between low-temperature greases and ordinary greases mainly lies in whether they need to withstand low-temperature occasions.

For the lubrication materials engineer, it is necessary to select the appropriate base oil and thickener according to different ambient temperatures, from various aspects such as type and viscosity, to ensure that the low temperature limit of the grease can meet the needs of users.

The basic requirement of low temperature grease is to withstand a long time of low temperature working environment, will not be frozen at low temperature, to avoid the problem of mechanical equipment difficult to start.

3. What are the characteristics of low temperature grease?

1, excellent low temperature performance, can maintain good flow at low temperatures, low temperature starting and running torque is very small, can ensure that the lubrication part even at -40 degrees of low temperature can also work normally, can be a good solution to the low temperature hardening, freezing, solidification, can not pump and other problems, but also make the product easier to start at low temperatures, greatly reduce the wear of cold start, Therefore, it is very suitable for low temperature, cold areas, field environment working products, automobile lubrication.

2, excellent rust prevention and protection, effectively protect metal parts from external erosion, reduce maintenance costs.

3, excellent lubricity and anti-wear protection, can make the lubrication part has a low coefficient of friction, which can effectively reduce the wear and power consumption of the parts surface, improve the reliability of the parts, extend the life of the parts and reduce the number of maintenance, so that the product can be more safe operation.

4, excellent adhesion, colloidal stability and mechanical stability, to ensure that the grease is not out of oil and not easy to dilute loss, firmly attached to the lubrication parts.

5, with good compatibility, compatible with most materials such as plastic and metal, will not cause adverse effects on plastic parts, such as rupture or swelling, but also reduce the noise of product operation.

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