Study On The Synthesis And Application Mechanism Of Polyacrylic Acid Series CWS Additives

Based on the literature research, the preliminary structure of new series of polyacrylic acid additives (PA) and synthesis procedure were proposed in this dissertation. The target products were synthesized under the esterification and copolymerization conditions which had been optimized through orthogonal experiments. The structures of products were improved based on the CWS forming experiments results. Thirteen kinds of PA were synthesized. The results of CWS forming experiments of six kinds of coal, such as Baori coal, Changcun coal and Tunliu clean coal etc, showed that the dosage of PA was less 40%～64%than naphthalene series additives at the constant CWS concentration saving 5～10 RMB/t. At the same dosage of additives, the coal concertration of CWS made from PA was higher 2%～5%than naphthalene series. Through the FT-IR analysis, it was speculated that the main chain of PA was a long hydrocarbon and side chains contained carboxyl groups, sulfonic groups, benzene rings and polyglycol esters. The molecular weight range was 30000～60000. The results of TG/DTA analysis indicated that PA could be stable below 380℃. PA series additives, which have flexible structure and more active adsorption sites, could improve hydrophilicity of coal obviously because of effective adsorption on the surface of coal particals. It is an excellent new series of coal water slurry additives.