There are various types of defoamers in the metal processing industry, and choosing the appropriate defoamer is crucial for improving processing efficiency and equipment lifespan. Surfactant based defoamers reduce the surface tension of liquids, thinning the bubble film and making it easier to rupture. They have good defoaming effect and stability, and are suitable for various metal processing liquid systems. Liquid silicone oil defoamers are known for their high thermal stability and chemical stability. They can effectively remove bubbles from metalworking fluids and do not have a negative impact on the metalworking process. In addition, liquid silicone oil defoamers also have good compatibility and durability. Organosilicon defoamers are widely used due to their excellent defoaming performance and good temperature resistance. Silicone defoamer can quickly destroy the surface tension of foam and make foam dissipate rapidly. Polyether defoamers are favored for their good compatibility and low toxicity, and are suitable for various metalworking fluids. Mineral oil defoamers, as traditional defoamers, have good economic efficiency and are suitable for cost sensitive processing applications.

Different types of defoamers for metalworking fluids have different applicable ranges and usage conditions. When selecting defoamers, comprehensive consideration should be given to factors such as the properties of the metalworking fluid, temperature, pressure, acidity, and alkalinity during the machining process. The dosage of defoamer should be adjusted according to the type, concentration, and occurrence of bubbles in the metalworking fluid. Insufficient usage may not effectively eliminate bubbles, while excessive usage may lead to a decrease in machining fluid performance or other adverse effects. The compatibility between defoamers and metalworking fluids is crucial for their effectiveness. If the compatibility between defoamers and the system is poor, phenomena such as turbidity, floating, and even color changes may occur, which can affect the performance and stability of the machining fluid. Therefore, compatibility testing is necessary when selecting defoamers.

Meanwhile, with the increasingly strict environmental regulations, the metal processing industry must also consider the environmental friendliness when choosing defoamers. Environmentally friendly defoamers should have low toxicity, low VOC (volatile organic compound) emissions, and be easily biodegradable to reduce potential harm to the environment and workers.

The selection of defoamers in the metal processing industry is a process that comprehensively considers multiple factors. Enterprises should choose appropriate types and quantities of defoamers based on their own processing needs, environmental conditions, cost budgets, and environmental requirements. With the advancement of technology and the deepening of environmental protection concepts, defoamers in the future metal processing industry will tend to develop in a more efficient, environmentally friendly, and economical direction.