Ammonium chloride can be used as flocculant for printing and dyeing wastewater decolorization. Mr. Zhou Xiong, the Materials Science and Chemical Engineering of Ningbo University, studied the modification of dicyandiamide-formaldehyde polymer by using urea to partially replace dicyandiamide for polymerization with formaldehyde. The decolorization rate and the removal rate of chemical oxygen demand were taken as the main evaluation indexes to investigate the flocculation decolorization performance of the product and to determine the feasible scheme.
Ammonium chloride is used for condensation and its main ratio is [n (dicyandiamide and urea): n (ammonium chloride):n (formaldehyde): 1. 0: 0. 6: 2. 0])to form dicyandiamide-urea-formaldehyde ternary condensation, the polymer is condensed by shrinkage between hydroxymethyl and amino groups or dehydration and condensation between hydroxymethyl groups. These active functional groups have a strong adsorption effect on the particles in the wastewater, and flocculation occurs through bonding and bridging to promote the aggregation of the particles.
Ammonium chloride can also be used as a printing and dyeing auxiliaries in the printing and dyeing industry. Because nh4cl can adsorb the sulfonic group in reactive dyes, and make the dyeing conform to the type of langmuir adsorption. The cross section of the fabric was observed by scanning electron microscope (SEM), and the dye was uniformly distributed in the fiber. The fastness to washing of dyed fabrics is similar to that of traditional dyeing methods.
Add: Zhuzhou City, Hunan Province, China