Closed acid catalyst for solvent-borne and water-borne coating systems. This additive promotes cross-linking of *resins with *containing resins. Especially HMMM-type low-reactive *formaldehyde resins require an accelerator to lower the curing temperature or reduce the baking time. BYK®-CATALYST 450 can be baked at temperatures 10-20°C (15-35°F) lower than other closed p-sulfonic acids.
Anionic fluorocarbon surfactant
Anionic fluorocarbon surfactants are a very important type of fluorocarbon surfactants, and they are also a class of fluorocarbon surfactants that have been used earlier. After the anionic fluorocarbon surfactant is dissolved in water, the anion of the anionic fluorocarbon surfactant and the cation in the solution form an ion pair, where the cation can be an inorganic metal ion or an organic cation. Anionic fluorocarbon surfactants can be divided into carboxylic acid type anionic fluorocarbon surfactants, sulfonic acid type anionic fluorocarbon surfactants, dyneon ptfe powder sulfuric acid type anionic fluorocarbon surfactants and phosphoric acid type anionic fluorocarbon surfactants. Their general structure is as follows:
Carboxylic anionic fluorocarbon surfactant E4-RpC OO-M+
Sulfonic acid anionic fluorocarbon surfactant L~1lRp SO, M
Sulfuric acid type anionic fluorocarbon surfactant  RpO SO, M+
Phosphoric acid type anionic fluorocarbon surfactant [13~14]R pOP(O) (O-M+) 2 In the formula, Rr is a fluorine-containing hydrophobic group, which can be a perfluorinated long carbon chain alkyl group or Is part of the fluorine-containing long carbon chain alkyl. The long carbon chain alkyl group may be linear or branched, and the long carbon chain fluorine-containing alkyl group may also contain heteroatoms such as oxygen and sulfur. Some typical anionic fluorocarbon surfactants are as follows, carboxylic acid type anionic fluorocarbon surfactants.
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