1. What is a water-based defoamer?
In industrial production, sometimes it is necessary to eliminate the foam produced, which requires the use of defoamer, water-based defoamer The agent is a water-emulsion dispersible defoaming agent formulated with dimethyl silicone, silica, emulsifier, etc., and is designed using emulsification technology. It is suitable for polyvinyl chloride resin, textile printing and dyeing, chemical reactions, petroleum Defoaming in chemical industry, metal working fluid, biological fermentation, water treatment, pharmaceutical and food fermentation industries.
2. How much water-based defoamer is generally added
Water-based defoaming agents are used in many industrial production fields. Pay attention to the amount of water-based defoaming agents added when using them. Generally speaking, the amount of water-based defoaming agents used in different viscous systems is different:
1. Generally, for latex paint systems with relatively high viscosity, the amount of water-based defoamer used will be more, between 0.3% and 1%. Because high viscosity systems have many factors to stabilize foam, the amount added will be slightly more.
2. In low-viscosity latex paint or water-soluble paint systems, the usage amount of water-based defoaming agent can be appropriately reduced, especially for water-soluble paint systems, generally between 0.01% and 0.2%.
3. For other water-based coatings or resin systems, the dosage of water-based defoaming agent is generally around 0.1%.
Warm reminder: The specific usage amount can only be obtained after testing the sample. The above data is for reference only.
3. Will adding too much water-based defoaming agent have any effect?
As an auxiliary for defoaming, the defoaming performance of water-based defoaming agent is: It is quite good. Most industrial foams can be processed, but you must pay attention to the usage amount. Adding too little will not be effective, and adding too much will also have negative effects:
1. In solvent-based In coatings, the addition of excessive defoaming agents will affect the density of the coating and cause oil blooms. After the coating is cured, problems such as shrinkage cavities, fish eyes, and white spots will occur. The gloss and transparency of the coating film will also be affected to a certain extent. Impact.
2. In high-temperature environments, adding excessive amounts of defoaming agent will lead to the emergence of a large amount of steam. Inhalation of these gases may harm human health and cause severe eye irritation and skin irritation.
3. Not only that, if the defoamer used contains methyl ethyl ketone, excessiveFoaming agents will lead to incomplete cleaning of the equipment. A large amount of organic residues will not only accelerate the erosion of the mechanical equipment and shorten the service life of the mechanical equipment, but will also affect the quality of the product and cause a certain waste of raw materials.
Therefore, when adding water-based defoamer, be sure to test the sample first, and then add the appropriate amount as needed to avoid adding too much.
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