When using liquid defoamers in water-based paint, there are several common types to choose from, including silicone defoamers, polyether defoamers, mineral oil defoamers, higher alcohol defoamers, and polyether-modified silicone defoamers. These defoamers have their own characteristics and are suitable for different application.
When using liquid defoamers in water-based paint, there are several common types to choose from, including silicone defoamers, polyether defoamers, mineral oil defoamers, higher alcohol defoamers, and polyether-modified silicone defoamers. These defoamers have their own characteristics and are suitable for different application.
Silicone defoamers: These defoamers are composed of polysiloxane and silica, and have high defoaming ability and long-lasting antifoaming performance. They can work over a wide temperature range. However, silicone defoamers may have a negative impact on the film-forming properties of some water-based coatings, such as the formation of cavitation, so it is necessary to weigh their advantages and potential problems when choosing.
Polyether defoamers: Polyether defoamers have good water solubility and biodegradability, good compatibility with most water-based systems, and are not prone to side effects. Its foam-breaking speed may be slightly slower than that of silicone defoamers, but it has a longer antifoaming time and is environmentally friendly. Our KDO MO-02 liquid defoamer is one kind of high-efficiency polyether defoamer.
Mineral oil defoamers: Based on mineral oil, it is made with emulsifiers and other additives and has a good defoaming effect on water-based systems. This type of defoamer shows good antifoaming performance in many systems, but may affect its durability and gloss in some water-based coating systems.
High-carbon alcohol defoamers: usually include straight-chain or branched alcohols of C6-C22, which have a good treatment effect on stubborn foams, especially suitable for situations where strong defoaming power and certain long-term foam suppression requirements are required.
When selecting a suitable water-based defoamer, it is necessary to consider the specific requirements of the paint, the compatibility of the defoamer, and the expected performance impact. For example, in water-based paint, the use of defoamers can be half added in the grinding stage to suppress the generation of foam, and then the other half is added in the paint mixing stage to ensure the quality and performance of the coating.