Pour point retarders are additives that can be added to oil to lower the pour point (the lowest temperature at which the oil can flow). These additives help improve the oil’s low-temperature properties and prevent it from thickening or solidifying at low temperatures.
Some common examples of pour point retarder include:
- Polymethacrylates: These are commonly used pour point depressants that work by changing the crystal structure of oil at low temperatures and preventing it from solidifying. Polymethacrylate effectively lowers the pour point of oil and improves its fluidity.
- Polyalkyl methacrylates: Similar to polymethacrylates, polyalkyl methacrylates are pour point depressants and help lower the pour point of oils. They are often used in applications where low-temperature fluidity is critical, such as automotive lubricants.
- Ethylene vinyl acetate copolymer (EVA): EVA is another pour point depressant commonly used in lubricants. It works by changing the wax crystal structure in the oil and improving its low-temperature properties.
- Phenols: Certain phenolic compounds can also act as pour point retarders. These compounds interact with the wax crystals in the oil and prevent them from agglomerating, thereby lowering the pour point.
- Polyisobutylene (PIB): PIB is a multifunctional polymer that can be used as a pour point depressant. Can be used with different types of lubricants to improve their low temperature performance.
The selection of a suitable pour point retarder depends on factors such as base oil composition, desired low temperature performance and specific application requirements. These factors must be carefully considered and the appropriate pour point retarder selected to ensure optimal performance of the oil in cold environments.