半连续种子聚合法合成苯丙乳液及应用于防水砂浆研究

发布时间：2018-02-11 05:43

本文关键词： 苯丙乳液砂浆乳液聚合　出处：《新型建筑材料》2015年12期 　论文类型：期刊论文

【摘要】：以苯乙烯(St)、丙烯酸异辛酯(2-EHA)为共聚单体,丙烯酸(AA)为功能性单体,碳酸氢钠(NaHCO_3)为稳定剂,通过半连续种子乳液聚合法制备苯丙乳液。以自制苯丙乳液为改性剂,水泥为主要胶凝材料,以钢渣部分替代河砂作为骨料,添加消泡剂及减水剂,配制新型聚合物防水砂浆。研究表明:当NaHCO_3用量为乳液的0.2%~0.3%时,苯丙乳液的稳定性良好,当丙烯酸用量为单体总质量的3.8%~5.0%时,苯丙乳液具有适宜的黏度;以自制苯丙乳液配制环境友好型砂浆,其抗渗压力、抗压强度、抗折强度都符合JC/T 984—2011《聚合物水泥防水砂浆》标准要求;扫描电镜分析表明,自制苯丙乳液改性砂浆内部结构均匀,密实度高,大大提高了改性砂浆的粘结强度。
[Abstract]:Styrene-acrylic emulsion was prepared by semi-continuous seed emulsion polymerization with styrene stout, isooctyl acrylate 2-EHA) as copolymerization monomer, acrylic acid (AAA) as functional monomer, sodium bicarbonate (NaHCO3) as stabilizer, and self-made styrene-acrylic emulsion as modifier. The new polymer waterproof mortar was prepared with steel slag as the main cementing material, steel slag partly instead of river sand as aggregate, and defoamer and water reducing agent. The results showed that the stability of styrene-acrylic emulsion was good when the content of NaHCO_3 was 0.2 ~ 0.3 of emulsion. When the amount of acrylic acid is 3.8- 5.0% of the total mass of monomer, the emulsion of styrene-acrylic has suitable viscosity, and the impermeable pressure and compressive strength of environmental friendly mortar are prepared by self-made styrene-acrylic emulsion. The flexural strength of the modified mortar meets the standard of JC/T 984-2011, and the SEM analysis shows that the internal structure of the modified mortar is uniform and the density is high, which greatly improves the bond strength of the modified mortar.
【作者单位】：扬州工业职业技术学院化学工程学院;江苏荣能集团股份有限公司;
【基金】：扬州市科技计划项目(YZ2014203)
【分类号】：TU578.1

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