抗泥型聚羧酸减水剂的合成与性能研究

Study on the synthesis and properties of mud resistant type polycarboxylate superplasticizer

为解决混凝土原材料含泥量高带来的减水剂使用掺量增加、混凝土坍损过快等问题,以聚醚大单体(HPEG)和丙烯酸为主要原料,抗泥保坍助剂为功能单体,过氧化氢和Vc为引发体系,合成抗泥型聚羧酸减水剂(KN-A)。同时研究了不同含泥量、合成起始温度以及链转移剂、抗泥保坍剂用量对抗泥型聚羧酸减水剂性能的影响,并采用GPC和FT-IR对合成减水剂的结构进行表征。混凝土试验表明:在应用不同种类含泥原材料时,达到相同坍落度水平情况下,减水剂掺量相对可减少12.5%~33.3%,同时不影响混凝土的抗压强度,表明该减水剂具有良好的抗泥性及适应性。

High content of mud in concrete raw materials have the problems which are the use of polycarboxylate superplasticizer is increased and the concrete slump is too fast.The anti-clay polycarboxylate superplasticizer(KN-A)was synthesized by using high molecular weight polyether macromonomer(HPEG)and acrylic acid as the main raw materials,anti-clay monomer as functional monomer,and hydrogen peroxide and vitamin C as initiate-system.It was studied the effects of polymerization degree of the main chain and temperature of building-up reactions and different dosage of anti-clay monomer on the properties of anti-clay polycarboxylate superplasticizer which was characterized by GPC and FT-IR.Concrete test results which has the same slump show that the amount of polycarboxylate superplasticizer is reduced by 12.5%~33.3%,which is suitable for several kinds of soil without affecting the compressive strength of concrete.This polycarboxylate superplasticizer had great anti-clay performance and adaptability.