中文摘要：

以丙酮、甲醛及亚硫酸钠为原料，采用磺化缩聚法通过控制缩合剂和磺化剂的用量，合成一系列具有不同分子量和不同磺化度的脂肪族磺酸盐水煤浆分散剂（SAF）．神华煤作为一种低阶煤，内在水分含量和氧含量过高，成浆性能较差．采用德国Haake流变仪测定SAF作为分散剂对低阶神华煤制浆的流变性能，结果表明，SAF的分子量和磺化度是影响其分散降黏作用的主要因素．SAF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，适宜的分子量（特性黏度为7．03～10．87）和较高的磺化度（1．64mmol／g）有利于提高SAF对水煤浆的分散降黏性能．采用Herschel—Bulkley模型对掺SAF的水煤浆浆体的流变曲线进行拟合，研究了SAF的分子量和磺化度对水煤浆流变性的影响．

英文摘要：

A water-soluble aliphatic polymer, sulphonated acetone-formaldehyde resin （SAF） was synthesized by sulfonation and polycondensation reaction. SAF with different molecu- lar and different degree of sulfonation were developed as dispersant for the preparation of highly- loaded coal-water slurry （CWS）, which were obtained by controlling the quantity of condensating agent and sulfonating agent. Shenhua coal is a kind of low rank coal, the internal water content and oxy- gen content is too high, which makes it hard to make coal water slurry. The Haake rheometer was used to measure the rheological property and viscosity of CWS prepared .from Shenhua coal. The re- sults show that the molecular weight and the degree of sulfonation of SAF were found to be the key factors affecting its capability for reducing the viscosity of CWS. Comparing with other dis- persants of CWS, SAF has much better dispersing effect than nathphalene sulfonate formalde- hyde condensate. The suitable molecular weight （inherent viscosity is 7.03-10.87） and the higher degree of sulfonation （1.64 mmol/g） are more effective for reducing the viscosity of CWS, and the shear-stress/shear rate data for each CWS prepared with SAF were fit to three-parameter Hersehel-Bulkley model. Based on the results, the SAF with medium molecular and higher de- gree of sulfonation is an effective and promising dispersant for highly-loaded CWS.