Grease is a lubricant mixed with base oils and additives. It is mainly used to reduce friction, wear and protect metal surfaces. Among them, the main function of additives is to improve the performance of grease to meet different usage needs.
Antioxidants
Antioxidants are one of the most commonly used additives in grease. Their main function is to delay the oxidation process of grease and extend its service life. Common antioxidants include phenols, amines, phosphorus and sulfur. Among them, phenolic antioxidants have good antioxidant properties and high temperature stability, so they are widely used in many grease formulations. Amine antioxidants have good hydrolysis stability and can be used in high temperature and high humidity environments.
Anti-wear agent
Anti-wear additives are additives that reduce wear on metal surfaces and can improve the anti-wear properties of grease. Anti-wear agents are generally divided into two types: oil-based anti-wear agents and polar anti-wear agents. Oil-based anti-wear agents can be adsorbed on the metal surface to form a protective film, thereby reducing friction and wear. Polar anti-wear agents can react chemically with the metal surface to form chemical bonds, thereby improving anti-wear performance.
Extreme pressure additives
Extreme pressure additives reduce friction and wear on metal surfaces by creating a chemical reaction under high pressure to create a low-friction surface. Extreme pressure additives are generally divided into two types: organic extreme pressure additives and inorganic extreme pressure additives. Organic extreme pressure additives have better load-bearing capacity and high temperature resistance, while inorganic extreme pressure additives have better extreme pressure and water resistance. solution performance.
Pour point depressant
Pour point depressants are additives that reduce the consistency of grease and improve the fluidity of the grease, making it easier to spread and pump. Pour point depressants are generally divided into two types: hydrocarbon pour point depressants and ester pour point depressants. Hydrocarbon pour point depressants can reduce the consistency of the grease by changing the molecular structure of the grease, while ester pour point depressants can react with the base oil. Interact and reduce the consistency of the grease.
When selecting grease additives, they need to be matched according to different application scenarios and needs. For example, grease used in high-temperature environments needs to choose antioxidants and anti-wear agents with good high-temperature stability; greases used in extreme pressure environments need to choose anti-wear agents and extreme pressure agents with good extreme pressure properties. Pressure additive; for grease used in low temperature environments, a pour point depressant needs to be selected to reduce the consistency and improve fluidity.
When using additives, you need to pay attention to the following points: first, avoid excessive amounts of additives to avoid negatively affecting the performance of the grease; second, avoid improper mixing to ensure compatibility between additives; finally, pay attention to The environment and conditions of use ensure that the additives can perform optimally in the corresponding environment.
In short, additives play a vital role in grease. Through reasonable selection and matching of additives, the performance of grease can be further improved to meet various different usage needs. Therefore, understanding and mastering the working principles and properties of additives is of great significance to the selection and use of grease.