【摘要】 根据分子结构设计原理,合成了一种改进型聚丙烯酸系高效减水剂(PC-C),对影响减水剂性能的几个关键因素进行了探讨,并用红外光谱表征了其分子结构。通过正交实验获得了最佳的合成参数:乙烯基磺酸钠(SVS):丙烯酸(AA):丙烯酸聚乙二醇单酯(PEA)=1.5:5:3,过硫酸铵(APS)用量为单体总质量的3%;同时研究了减水剂侧链和掺量对分散性能的影响。结果表明:采用甲氧基聚乙二醇(MPEG)作为接枝侧链合成减水剂的分散能力优于采用聚乙二醇(PEG)合成的减水剂;PC-C低掺量即可发挥高分散性能,分散保持性能随掺量的增加而得以提高。更多还原

【Abstract】 According to design theory of molecular structure,a new type of poly-acrylic series superplasticizer(Pc-C)was synthesized,various cfitical factors influencing performance of superI)lasticizer were discussed,it’s molecular structure was characterized by IR spectrum.Optimal synthesize parameters were obtained through orthogonal test:sodium Vinylsulphonate(SVs):crylic acid(AA):polyethylene glycol mono-acrylate(PEA)=1.5∶5∶3,dosage of APs took 3%proportion of monomer gross weight.The innuence of graft side chain and dosage on dispersing property of superlasticizer were also inves’igated· Experimental tests showed that dispersing ability of superl)lasticizer synchesized by using MPEG asafI sidechain was better than PEG;PC-C exerted high dispersing property with low dosage and dispersing retention property improved with the increase of dosage.更多还原