以丙烯酸(AA)和4种不同侧链长度的聚乙二醇单甲醚(MPEG 相对分子质量分别为350,500,750,1000)先酯化合成大单体(MPEGAA),再以丙烯酸、对苯乙烯磺酸钠(SSS)为单体,在引发剂过硫酸钾、链转移剂异丙醇作用下聚合得到4种具有不同侧链长度的聚羧酸盐分散剂.通过红外光谱(FT-IR)、核磁共振氢谱(1 H NMR)、凝胶渗透色谱(GPC)、热重分析(TG)和差示扫描量热分析(DSC)对聚合物的分子结构、相对分子质量及其热力学性能进行了表征和分析.将其作用于彬长煤制浆,考察了浆体的表观黏度、最佳添加用量、最大成浆浓度、Zeta电位和稳定性.结果表明侧链长度为 PC500(n＝11)的聚羧酸盐分散剂降黏效果最佳,且最佳用量0．4％(质量分数)时,水煤浆最高制浆浓度可达到68％,Zeta 电位由－11．2 mV变化到－41．5 mV,对彬长煤具有更好的分散降黏和稳定的作用.
The esterified macromonmer (MPEGAA)was obtained by esterification of methoxy polyethylene gly-col (MPEG)with four kinds of different side chain lengths and acrylic acid.Four kinds of different side chain lengths of polycarboxylate dispersant were preared from esterified macromonmer (MPEGAA),acrylic acid (AA),Sodium p-styrenesulfonate(SSS)as monomers,potassium persulfate(K2 S2 O8 )as initiator and isopro-panol as the chain transfer agent.Their structures,thermodynamic performance,the molecular weights and distributions characterized and analyzed by FT-IR,1 H NMR,TG,DSC and gel permeation chromatography (GPC).They were applied to Binchang coal,and apparent viscosity,Zeta potential,the optimum dosage,the maximum slurry concentration and stability of the slurry were investigated.The results show that when the op-timum dosage of dispersant is 0.4%,the highest concentration of CWS can reach 68%,and Zeta potential chan-ges from -11.2 to -41.5 mV,polycarboxylic dispersant with the length of side chain PC500(n=11),as well as better function on viscosity reduction,dispersal and stabilization of Binchang coal.
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