亲水性聚脲-聚醚型聚羧酸减水剂的合成与性能研究

Study on the preparation and properties of hydrophilic polyurea-polyether type polycarboxylate superplasticizer

以自主开发的低活性芳香族端氨基聚乙二醇醚、异佛尔酮二异氰酸酯(IPDI)、异戊烯醇和乙醇酸为原料,合成亲水性异戊烯基聚脲单体(APU),然后将其作为常规聚醚(HPEG)的替代物,按不同APU/HPEG摩尔比制备得到系列聚脲-聚醚型聚羧酸减水剂(PUCE),考察了不同PUCE对新拌水泥净浆及混凝土性能的影响。结果表明:当APU的摩尔替代量为15%～20%时,所制备的PUCE具有较好的综合性能。由其所拌合的混凝土具有优良的流动保持性、适中的含气量和较低的泌水率,同时抗压强度也略有提高。

A type of hydrophilic isopentenyl polyurea monomer(APU) was synthesized by using self-developed low-active aromatic amine-terminated polyglycol ether,isophorone diisocyanate(IPDI),prenyl alcohol and glycolic acid as raw materials. Then APU were used as a substitute for conventional polyoxyethylene ether(HPEG) and a series of polyurea-polyether type superplasticizer(PUCE) with different APU/HPEG mole ratio were obtained. The effect of different types of PUCE on the performance of fresh cement and concrete were investigated. The results show that when the mole content of APU was in the range of 15%~20%,the prepared PUCE had better comprehensive performance. The concrete with PUCE had excellent flow retention,moderate gas content and lower bleeding rate,at the same time the compressive strength also increased slightly.