微波作用下酰胺型聚羧酸减水剂的合成及其性能研究

发布时间：2018-12-29 21:12

【摘要】：在微波作用下,以自制活性大单体聚乙二醇丙烯酸酯(PEGAA)、马来酸酐(MAH)、丙烯酰胺(AM)及甲基丙烯磺酸钠(SMAS)为主要原料,过硫酸铵(APS)为引发剂,制备性能优异的酰胺型聚羧酸减水剂,考察各单体用量、微波功率、反应时间等因素对减水剂性能的影响。结果表明,合成酰胺型聚羧酸减水剂最佳工艺为:n(MAH)∶n(PEGAA)∶n(SMAS)=2.5∶1∶0.5,AM、APS质量分数分别为反应物总质量的9%和4%,微波功率300 W及反应时间25 min。与传统的水浴相比,该工艺高效、节能,产品性能优异,在聚羧酸减水剂掺量0.5%条件下,水泥净浆流动度达275 mm,砂浆减水率32.5%,且前期具有缓凝作用,后期对胶砂抗压强度增强显著,具有良好的工业应用前景。
[Abstract]:Under microwave irradiation, the active macromonomer (PEGAA), maleic anhydride (MAH), acrylamide (AM) and sodium methallyl sulfonate (SMAS) were used as raw materials and ammonium persulfate (APS) as initiator. Amide-type polycarboxylic acid superplasticizer with excellent properties was prepared. The effects of the amount of monomer, microwave power and reaction time on the performance of water reducer were investigated. The results showed that the optimum conditions for the synthesis of polycarboxylic acid superplasticizer were as follows: n (MAH): n (PEGAA): n (SMAS) = 2.5: 1: 0.5% amps was 9% of the total mass of reactants and 4% of the total mass of reactants. Microwave Power 300W and reaction time 25 min. Compared with the traditional water bath, this process has the advantages of high efficiency, energy saving and excellent product performance. Under the condition of 0.5% polycarboxylic acid water reducer, the fluidity of cement paste reaches 32.5% of the water reducing rate of 275 mm, mortar, and it has retarding effect in the early stage. The compressive strength of cemented sand is enhanced significantly in the later period, and it has a good prospect of industrial application.
【作者单位】：广西科技大学生物与化学工程学院;广西科技大学鹿山学院食品与化学工程系;
【基金】：广西教育厅科研项目(KY2015YB170) 广西高校糖资源加工重点实验室开放课题资助(2016TZYKF02)
【分类号】：TU528.042.2

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