Stability of Dye Dispersions in the Presence of Some Eco‐Friendly Dispersing Agents
作者:H. Gharanjig、K. Gharanjig、Sina Tafaghodi
DOI:10.1007/s11743-013-1493-x
日期:2013.11
The stability of dyedispersions in the presence of ethoxylated sorbitan lauryl and oleyl esters were reported and compared with dyedispersions containing a conventional dispersingagent, i.e. naphthalene sulfonic acid methylene‐bis sodium salt (NSAB). The optimum operating conditions obtained using a central composite design and stability of dyedispersions were evaluated by a turbidimetry method
A process for the manufacture of aromatic nitriles by reacting an aromatic halogen compound with formamide and the anhydride of a monocarboxylic acid in the presence of a copper catalyst and an acid-binding agent. Particularly applicable to replacement of halogen ortho to the azo linkage of an azo dyestuff by cyano.
A new synthetic strategy for industrially important deep-shade disperse azo dyes was presented in this study. The key procedure is to prepare stable solid diazonium salts of weakly basic amines in the absence of concentrated sulfuric acid. Diazotization by tert-butyl nitrite in ethylacetate was allowed to proceed in the presence of equivalent 1,5-naphthalenedisulfonic acid as stabilizer of diazonium