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Aug 27, 2021
Paint defoamers generally include two categories: polydimethylsiloxane and modified polydimethylsiloxane. Polydimethylsiloxane is a high boiling point liquid with poor solubility. Has very low surface tension. Good thermal stability. It is a kind of widely used silicone defoaming agent. With its different structure and polymerization degree, polydimethylsiloxane exhibits different properties. It can be used as a foam stabilizer, defoamer, leveling agent, and hammer pattern. Agent. Only polydimethylsiloxane with suitable solubility and compatibility can have the defoaming function.
Paint defoamers are mainly aimed at; oil-based polyurethane systems have excellent foam suppression and defoaming functions, oil-based screen printing inks/lubricants/oil-based glues have significant effects when used in oil-based screen printing inks/lubricants/white oils/oil-based glues. Can be widely used in high-viscosity inks, electronic solder mask inks, screen printing UV inks, brushed wood paint, PU paint, plastic/floor paint, polyurethane paint, nitrocellulose paint, wood paint, top paint, metal paint, automotive paint , Architectural paint, varnish, etc.
The application of defoamers in coatings and inks depends on the application of the system. Water-based systems generally use defoamers, and solvent-based systems use defoamers. The defoamers commonly used in defoamers include mineral oil defoamers, silicone defoamers and polymer defoamers.
The defoamer should achieve the best defoaming effect of the best product. The following conditions need to be met. In order to achieve the best product quality.
1. The surface tension of low surface tension foam medium
2. It does not dissolve in the foam medium or the solubility is very small, but it has the affinity to contact with the foam surface
3. Easy to diffuse in the foam system, and can enter the foam and replace the foam membrane wall
4. Has a certain chemical stability. Ensure its compatibility and product stability
5. It has a suitable particle size dispersed in the foam medium as the defoaming core
According to chemical composition, defoamers can be divided into three categories: mineral oil defoamers, silicone defoamers, and polymer defoamers.
Mineral oil defoamers are usually graded by carrier, active agent, and spreading agent. Check the substance with low surface tension. Its role is to carry and dilute. Common carriers are water, hydrocarbon oil, fatty alcohol, etc. The role of the active agent is to resist and eliminate foam. The choice of the active agent depends on the nature of the medium. Commonly used are waxes, silicone oils, aliphatic amides, high molecular weight polyethylene glycols, fatty acid esters, and hydrophobic silica.
Silicone defoamers generally include two types: polydimethylsiloxane and modified polydimethylsiloxane. Polydimethylsiloxane is a high boiling point liquid with poor solubility. Has very low surface tension. Good thermal stability. It is a kind of widely used silicone defoaming agent. With its different structure and polymerization degree, polydimethylsiloxane exhibits different properties. It can be used as a foam stabilizer, defoamer, leveling agent, and hammer pattern. Agent. Only polydimethylsiloxane with suitable solubility and compatibility can have defoaming function, in some cases. The methyl group may also be substituted with ethyl, phenyl and the like. Polydimethylsiloxane defoamers generally come in several forms: bulk, solution, emulsified and composite. The composite type is the most widely used form in coatings.