中国塑料 ›› 2021, Vol. 35 ›› Issue (2): 29-33.DOI: 10.19491/j.issn.1001-9278.2021.02.005

• 材料与性能 • 上一篇    下一篇

聚苯乙烯接枝聚丙烯酸丁酯乳液改性水泥砂浆的性能及微观结构分析

熊辉霞1, 赵文杰2()   

  1. 1.南阳理工学院土木工程学院,河南 南阳 473004
    2.长春工业大学化学工程学院,长春 130012
  • 收稿日期:2020-09-27 出版日期:2021-02-26 发布日期:2021-02-22
  • 基金资助:
    吉林省教育厅科技项目发展基金(JJKH20180581KJ)

Properties and Microstructure of PS⁃g⁃PBA Emulsion⁃modified Cement Mortars

XIONG Huixia1, ZHAO Wenjie2()   

  1. 1.School of Civil Engineering,Nanyang Institute of Technology,Nanyang 473004,China
    2.Institute of Chemical Engineering,Changchun University of Technology,Changchun 130012,China
  • Received:2020-09-27 Online:2021-02-26 Published:2021-02-22
  • Contact: ZHAO Wenjie E-mail:zhaowenjie@ccut.edu.cn

摘要:

合成了聚苯乙烯(PS)接枝聚丙烯酸丁酯(PBA)乳液(PS?g?PBA),并将其用于改性水泥砂浆,考察了PS?g?PBA乳液含量及PS与PBA的质量比对改性水泥砂浆的减水率、流动度、力学性能以及毛细孔吸水率的影响。结果表明,3种水泥改性剂的减水效果优异,减水率的极大值为56.7 %,改性水泥砂浆的毛细孔吸水率下降明显,其极小值为0.288 kg/m2;PS?g?PBA乳液对改性水泥砂浆的力学性能也产生重要影响。使抗压强度普遍降低,部分改性砂浆的抗折强度增加,其极大值为8.1 MPa。经扫描电子显微镜观察到了乳胶膜与水泥水化物形成的互穿网络结构以及位于孔洞中正六角形板状的氢氧化钙的晶体结构。综上,PS?g?PBA乳液可以在水泥砂浆中应用。

关键词: 聚苯乙烯接枝聚丙烯酸丁酯乳液, 改性, 水泥砂浆, 性能, 微观结构

Abstract:

In this paper, a type of polystyrene?grafted poly(butyl acrylate) (PS-g-PBA) emulsion was synthesized and then used to modify cement mortars. The effects of mass ratios of PS to PBA and polymer to cement on the fluidity, water reduction effect, mechanical properties and capillary water absorption rate of PS-g-PBA emulsion-modified cement mortars were investigated. The results show that the water reduction effect of the three cement modifiers is excellent, and the maximum value of water reduction rate is 56.7 %. The water absorption rate of the pores of the modified cement mortar decreases obviously, and its minimum value is 0.288 kg/m2.PS-g-PBA emulsion also has an important effect on the mechanical properties of modified cement mortar.The compressive strength is generally reduced, and the flexural strength of partially modified mortar is increased, and its maximum value is 8.1 MPa.The PS-g-PBA cement modifiers developed by this work are suitable for use in the modification of cement mortars.

Key words: polystyrene-grafted poly(butyl acrylate) emulsion, modification, cement mortar, property, microstructure

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