分散剂分子结构特征对煤浆流变特性的影响

CHARACTERIZATION OF DISPERSANT STRUCTURES AND THEIR EFFECT ON RHEOLOGICAL BEHAVIOUR OF COAL WATER SLURRY

系统考察了具有不同分子结构特片系列分散剂对高浓度煤浆性质的影响。发现煤的成浆性、浆体的流变特性和稳定化作用与分散剂的分子结构特征密切相关。就本研究所涉及的分散剂种类和煤种而言，分散剂单体结构中多核芳烃结构所占比例较小时易于使浆体呈屈服假塑性，相反，则使浆体呈屈服胀塑性。分散剂单体的侧链结构对煤成浆性和浆体流变性的影响不很突出，而分散剂的第二单体结构的影响却非常显著。结果还同时表明，分散剂的高分散性能是导致浆体呈屈服胀塑性流体和弱化浆体稳定化作用的重要因素。

The dispersant structures and their effect on properties of coal water slurries were characterized in detail The results indicated that coal slurryability (represented by coal content of slurry at fixed viscosity and shear rate) and rheological behaviour as well as static stabilization of coal water slurries are notably related to dispersant structures The adaptability of coals to dispersant structures are very complicated and related to coal properties determined by coal rank Generally, low percentage of multiring aromatic monomer in dispersant polymerization structure results in a fine pseudoplastic behaviour of slurry but lower down the dispersing ability of dispersant Comparatively, the substitutes of a dispersant monomer are of little effect It was also found that high dispersing ability of a dispersant is one of the important factors that cause a dilatant behaviour and low static stabilization of coal water slurry