聚对苯乙烯磺酸钠添加剂的分子量对水煤浆浆体性质的影响

Three sodium polystyrene sulfonate (PSS) additives with different molecular weight and 8 coals are selected to evaluate the effect of molecular weight of PSS on the properties of coal water slurry (CWS). The range of weight average molecular weight of PSS for preparing coal water slurry is from 53400 to 333900. The results indicate that the slurryability of CWS of 8 coals decreases as the molecular weight of PSS increases. The relation between slurryability of CWS and molecular weight of PSS is attributed to the adsorption of PSS on the coal particles. The adsorption quantity of PSS with low molecular weight on the coal particles is larger than that of PSS with high molecular weight. On the other hand, the rheological behavior of CWS of 8 coals is changed from dilatant flow to pseudoplastic one as the increase of molecular weight of PSS. The static stability of CWS is also improved with increasing molecular weight of PSS.