Preparation
C.I. Direct Red 111,C.I. Direct Red112 [by reflux conditions (or slightly belt pressure), in the sodium hydroxide solution will be (E)-2-(2-sulfo-4-nitrostyryl)-5-nitrobenzenesulfonic acid with Sodium 4-aminobenzenesulfonate diazotization and Naphthalen-1-amine coupling product with heating and be] into dicyclohexyl amine salt.
Properties and Applications
is mainly used for ballpoint ink, also used for wood, lacquer, printing ink and plastic coloring.
