聚丙烯酸钠的合成及其相对分子质量对CaCO3分散性的影响

Synthesis of sodium polyacrylate and the effect of its relative molecular mass on dispersion of calcium carbonate

采用水溶液聚合法,以Na2S2O8作引发剂,NaHSO3作链转移剂,通过调整引发剂和链转移剂之间的摩尔比制备了具有不同相对分子质量的聚丙烯酸钠。研究了聚丙烯酸钠作为分散剂时,其相对分子质量对CaCO3分散性的影响。结果表明:聚丙烯酸钠的分散效果与其相对分子质量有很大关系,相对分子质量过高或过低,分散效果都不理想。当聚丙烯酸钠黏均分子量在3 000～3 500时,对CaCO3的分散性最好。

The author prepared sodium polyacrylate with different relative molecular mass via aqueous solution polymerization in the presence of Na2S2O8 as initiator and NaHSO3 as chain transfer agent by regulating the molar ratio of the initiator to the chain transfer agent. The effect of the relative molecular mass of sodium polyacrylate as dispersing agent on dispersancy of calcium carbonate was studied. The results show that the dispersancy effectiveness of the sodium polyacrylate is closely dependent on its relative molecular mass and is undesirable in the case of too high or too low relative molecular mass, The dispersancy to the calcium carbonate attains its maximum when the viscosity average molecular mass of sodium polyacrylate is in the range of 3 000 to 3 500.