聚醚聚羧酸盐在煤粒表面的吸附与分散作用研究

Study on adsorption of polyether polycarboxylate on coal particle surface and its dispersion properties

通过与直链聚丙烯酸/苯乙烯磺酸盐(PAA-SSS)和壬基酚聚氧乙烯醚(NP-8)比较,研究了梳型聚醚聚羧酸盐(PC-350)对彬长煤的成浆性能与其在煤粒表面的吸附行为之间的关系,分析了不同分散剂对煤表面Zeta电位的影响.研究发现,直链型PAA-SSS以卧式吸附在煤粒上,吸附量和吸附速率最小,其通过静电斥力作用使浆体具有较好的流动性,但稳定性较差;NP-8通过单点尾式吸附方式,具有较大吸附量和较快吸附速率,但其降粘性能不好;梳型PC-350以梳型方式吸附,其吸附量和吸附速率居中,而其成浆性能(分散降粘和稳定性)最好,其既具有离子型侧基的静电作用保证了分散降粘,又引入了聚醚亲水侧链空间位阻作用增加了浆体稳定.

By comparison with linear polyacrylic acid/styrene sulfonate （PAA SSS） and non ylphenol polyoxyethylene ether （NP 8） ,the relationship between the comb type polycarbox ylate （PC 350） and the adsorption performance of Bin chang coal on its surface was studied. The effect of different dispersants on the surface Zeta potential was analyzed. The study found that the linear PAA SSS adsorbed horizontally on the coal particles with the lowest ad sorption amount and adsorption rate. The electrostatic repulsive force makes the slurry have good fluidity,but its stability is poor;NP 8 has a single point tail adsorption method,which has a larger adsorption capacity and a faster adsorption rate, but its viscosity reduction per formance is not good;The comb type PC 350 is adsorbed by the comb type,its adsorption ca pacity and adsorption rate are medium, and its slurry performance （dispersion viscosity re duction and stability） is the best. It has the electrostatic effect of the ionic side groups to en sure dispersion and viscosity reduction. The introduction of the steric hindrance of the hydro philic side chain of the polyether increases the stability of the slurry.