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机构地区:[1]重庆大学材料科学与工程学院,重庆400045
出 处:《新型建筑材料》2018年第1期46-49,共4页New Building Materials
摘 要:选用丙烯酰胺(AM)、二甲基二烯丙基氯化铵(DMDACC)、丙烯酸(AA)、甲基丙烯酸二甲氨乙酯(DMAEMA)为单体,甲基丙烯磺酸钠(SMAS)为链转移剂,过硫酸铵(APS)和抗血坏酸(Vc)为引发剂,通过水溶液自由基聚合,合成了一种聚羧酸抗泥剂。以内掺膨润土的水泥净浆流动度为评价指标,通过正交试验和单因素实验对工艺进行优化。试验结果表明,最佳合成工艺为:n(AA)∶n(DMDACC)∶n(AM)∶n(SMAS)=3.6∶1.4∶2.5∶0.5,反应温度为65℃,引发剂用量为单体总质量的6%。在此条件下合成的抗泥剂,可显著提高聚羧酸减水剂的抗泥性能。在膨润土掺量为5%、聚羧酸减水剂掺量为0.15%时,掺0.05%抗泥剂前后的水泥净浆流动度分别为270 mm和205 mm。Selecting acrylamide(AM) ,diallyldimethylammonium chlofide(DMDACC) ,acyclic acid(AA) ,2-(Dimethylamino) ethyl methacrylate (DMAEMA) as polymeric monomers, sodium methally] sulfonate (SMAS) as the chain transfer agent,ammonium per- sulfate(APS) and ascorbic acid(Vc) as the initiators,the anti-clay agent was synthesized based on polycarboxylate superplasticizer by using aqueous solution polymerization. To optimize the reaction conditions by orthogoual array design and single factor experi- ment. The fluidity of cement paste within doped bentonite was taken as indexes. The test results show that optimized process to be n (AA) :n (DMDACC) :n (AM) :n (SMAS) =3.6:1.4:2.5:0.5, the reaction time is 65℃, m (APS-Vc) is 6% of all monomers. Under the optimized conditions,adding 0.05% anti-clay agent,the fluidity of cement paste mixing with 5% bentonite and 0.15% PCE is 270 ram. Under the same condition without anti-clay agent, the fluidity of cement paste is just 205 ram.
分 类 号:TU528.042[建筑科学—建筑技术科学]
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