中文摘要：

以木质素磺酸钠为原料，通过磺化缩聚法合成一种木质素系水煤浆分散剂（GCL3S）．水煤浆的流变性能测试表明，GCL3S对水煤浆的分散降黏能力优于萘磺酸盐甲醛缩合物系分散剂，GCL3S的分子量和磺化度是影响其对水煤浆分散降黏能力的主要因素，其中分子量的影响更为显著，适宜的分子量（特性黏度为6．84mL／g～12．21mL／g）和较高的磺化度（1．89mmol／g）有利于提高GCL3S对水煤浆的分散降黏性能．采用Herschel—Bulkley模型对掺GCL3S的水煤浆浆体的流变曲线进行拟合，研究了GCL3S的分子量和磺化度对水煤浆流变性的影响．

英文摘要：

By sulfonation and fasculation reaction,sodium lignin sulfonate was modified as a dispersant （GCL3S） of coal water slurry （CWS）. The molecular structure of the dispersant was studied and the molecular weight and the degree of sulfonation were found to be the key factors affecting its capability for reducing the viscosity of CWS,especially the molecular weight. Comparing with other dispersants of CWS showed that GCL3S has much better dispersing effect than nathphalene sulfonate formaldehyde condensate. The suitable molecular weight （the inherent viscosity is 6. 84 mL/g-12. 21 mL/g）and the higher degree of sulfonation （1. 89 mmol/g） are more effective for reducing the viscosity of CWS. The Haake rheometer was used to measure the rheological properties, and the shear-stress/shear rate data for each CWS prepared using GCL3S were fit to three-parameter Herschel-Bulkley model, and the effects of the molecular weight and the degree of sulfonation of GCL3S on rheological behavior of CWS were investigated.