The main function of metalworking fluid is lubrication, cooling and cleaning. During metal processing, it can reduce the friction coefficient, reduce wear and heat generation, thereby playing the role of lubrication and cooling. At the same time, it can also clean the metal surface. Dirt and metal shavings, maintaining the finish and precision of machined surfaces. However, the existence of foam interferes with the production and use of machining fluids, and defoamers in metalworking fluid are developed for oily foaming systems.
A large number of foams in metalworking fluids are mainly due to the following reasons
1. The liquid contains surfactants. Metalworking fluids often contain surfactants, such as sodium dodecylbenzenesulfonate, etc. These substances can reduce the surface tension of the liquid, reduce the energy on the surface of the liquid, and make the liquid molecules Easier to spread and form lather.
2. The liquid contains air, and the processing liquid may contain a large amount of air. When the liquid is stirred or vibrated during processing, the air will be stirred into the liquid to form foam
3. If the temperature is too high, the metalworking fluid will be affected by friction and heat during processing. When the temperature of the liquid is too high, the movement speed of the liquid molecules will increase, the surface tension will decrease, and the liquid will more easily form foam.
What are the functions of metalworking fluid defoamers
1. Increase the service life of the processing fluid. Foam will cause the liquid molecules in the processing fluid to disperse unevenly, resulting in the inability of the components in the processing fluid to fully function, thereby reducing the service life of the processing fluid.
2. To prevent affecting the processing quality, the foam will cause the liquid molecules in the processing fluid to disperse unevenly, resulting in insufficient wetting of the metal surface during processing, thus affecting the processing quality.
3. To prevent damage to processing equipment, foam will increase the viscosity of the processing fluid, thereby increasing the load on mechanical equipment and causing damage to mechanical equipment.
