A defoamer is a chemical that is widely used in various industries and is mainly used to eliminate or suppress air bubbles in liquids. Here are some substances that can be used as defoamers, and they play an important role in different applications:
1. Inorganic defoamer: such as aluminum sulfate, ammonium sulfate, etc. These inorganic salts can form gelatinous or supersaturated solutions in water, eliminating bubbles in the liquid by destabilizing them.
2. Organic defoamers: This type of defoamer is usually some polymer compounds, such as polyester, polyether, polysiloxane, etc. They have good surface activity and are able to reduce the tension on the surface of the liquid, thereby disrupting the formation and stabilization of bubbles.
3. Surfactant-based defoamers: These defoamers combine the properties of surfactants to reduce surface tension and disrupt and inhibit the formation of bubbles. They can be divided into ionic and non-ionic types, and the defoaming effect is achieved by adsorbing on the surface of the bubble and changing its surface tension.
4. Natural substance defoamers: such as starch, colloids and their derivatives, these natural substances have good aqueous phase stability and dispersibility, and can quickly defoam in aqueous solutions.
5. Polyoxyethylene type defoamer: such as POLYFILM EC, KRYSTAL's water-soluble defoamer, etc., this type of defoamer forms a network structure in the liquid through the long chain structure of the polymer, thereby eliminating air bubbles.
6. Polyacrylamide-type defoamers: such as aqueous electrostatic dispersive polymeric dispersants, they are dispersed in the liquid by electrostatic action, effectively eliminating air bubbles.
7. Polyether defoamer: such as PETEX-ME, polyether defoamer has good water solubility and dispersibility, and can effectively eliminate bubbles in various aqueous systems.
8. Polyester defoamers: such as rice crops, xyloate diesters, etc., these defoamers eliminate air bubbles by changing the tension of the liquid surface.
9. Silicone defoamer: such as polyether silicone oil, polysilicone oil, etc., silicone defoamer has good chemical stability and high temperature resistance, and is widely used in various industrial fields.
In addition, there are special defoamers, such as high-temperature defoamers, roll-coating defoamers, flame retardant defoamers that are both rust resistant and defoaming, etc., which are designed and used according to specific application scenarios and needs.
In summary, the selection and use of defoamers needs to be determined according to the specific application scenario and needs. Different defoamers have different characteristics and advantages, so it is necessary to consider factors such as defoaming effect, safety, stability and environmental friendliness to choose the right defoamer. At the same time, it is also necessary to follow certain usage methods and precautions when using defoamers to ensure their effectiveness and safety.
