梳形聚羧酸盐AMPS/MAA/MAAMPEG的制备与性能研究

摘要

The methoxy polyethylene glycol methacrylate ester monomer (MAAMPEG) was prepared by methoxy polyethylene glycol (MPEG, ethylene oxide units of 11, 23) and methacrylic acid (MAA) as raw materials.Comb-like polycarboxylate (PC) dispersants AMPS / MAA /MAAMPEG (AMAPEG) bearing side chains of different lengths were prepared using the esterification monomer, methacrylic acid,and 2-acrylamido-2-methyl propane sulfonic acid (AMPS).The structure, molecular weight and distribution of the polycarboxylate were characterized by infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (1H-NMR), gel permeation chromatography (GPC).The PCs and naphthalene sulfonate (NSF) were applied to make Binchang coal-water slurry (CWS).The results show that the Mw of the PC is 2×104~3×104 and the dispersion coefficient D is about 1.3.When the optimum dosage of dispersant is 0.4%, the highest concentration of CWS can reach 65%, the viscosity slurry is about 447 mPa·s and zeta potential is-56 mV.The PC shows better wetting property and better dispersion viscosity as well as stability than the NSF dispersant.%以甲氧基聚乙二醇(MPEG,氧乙烯单元数为11,23)和甲基丙烯酸(MAA)为原料制得甲氧基聚乙二醇甲基丙烯酸酯化单体(MAAMPEG);再以该酯化单体、甲基丙烯酸和2-丙烯酰胺-2-甲基丙磺酸(AMPS)为原料,制得具有不同长度侧链的梳形聚羧酸盐(PC)分散剂AMPS / MAA /MAAMPEG(AMAPEG).利用核磁共振氢谱(1H-NMR)、红外光谱仪(FT-IR)、凝胶渗透色谱仪(GPC)对分散剂分子的结构、分子质量及分布进行了表征;并将其和工业分散剂萘磺酸盐(NSF)用于彬长煤制水煤浆,结果表明,所得目标聚合物的Mw为2×104~3×104,分子量分散系数D在约为1.3,煤质量浓度为65%时,最佳用量为0.4%,浆体粘度约为447 mPa·s,zeta电位达到-56 mV,比萘磺酸盐具有良好的润湿效果,更好的降粘分散和稳定作用.