A very strange defoamer
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A very strange defoamer. Purpose: Used for defoaming water-based systems containing hydrochloric acid, at pH=1. Appearance: A pale yellow transparent aqueous solution; at pH=9, it forms foam when stirred. Preliminary tests: It contains anionic surfactants, may also contain non-ionic surfactants; it contains no volatile organic compounds but does contain inorganic substances. Solid content: 3%. A strange phenomenon is that the addition of a dilute sodium chloride solution to this defoamer results in the formation of a white precipitate. Acidification with hydrochloric acid produces bubbles that persist for some time, while the liquid becomes white and turbid. What substances might be present inside that could form a precipitate with sodium chloride? Does acidification release a small amount of gas slowly? Please ask experts to help analyze and discuss! Additionally, the addition of sodium carbonate, barium chloride, and silver nitrate all results in a white precipitate.
I am also very eager to learn about this area; I wonder if any expert could offer some practical guidance? :handshake
I’m also very interested in learning about this type of defoamer? Where is it used? I work with water-based lamination adhesives; which defoamers would be suitable for me?
What substances might be present inside that could form a precipitate with sodium chloride? There aren’t many substances that can form a precipitate with sodium chloride.
Contains Ag+; I’ve never heard of any similar defoamers
I don’t understand; I can’t figure out what it is.
Some silica can be used as an antifoaming agent.