Qiao Min, Wu Jingzhi, Gao Nanxiao, Shan Guangcheng, Shen Fei, Chen Jian, Zhu Bosong
State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China.
Bote New Materials Taizhou Co., Ltd., Taizhou 225474, China.
Materials (Basel). 2022 Oct 25;15(21):7492. doi: 10.3390/ma15217492.
In this study, a series of polyether-type defoamers for concrete which consist of the same alkyl chain (hydrophobic part) but different polyether chains (hydrophilic part) was prepared, and the structure-property relationship of the defoamers was investigated for the first time. Using oleyl alcohol (OA) as the starting agent (alkyl chain), the polyether defoamers with different polyether chains were prepared by changing the amount and sequence of ethylene oxide (EO) and propylene oxide (PO) units. The properties of different defoamers were tested in aqueous solutions, and fresh and hardened mortars; the structure-property relationship of the defoamers was thus studied. The results indicated that the defoaming capacity of the polyether defoamers decreased with an increased EO amount, and the defoamers linked with both EO and PO units (PO before EO) had a stronger defoaming capacity than those linked with EO only. This study is beneficial for the development and applications of novel synthetic polyether-type defoamers for concrete.
在本研究中，制备了一系列由相同烷基链（疏水部分）但不同聚醚链（亲水部分）组成的混凝土用聚醚型消泡剂，并首次研究了消泡剂的结构-性能关系。以油醇（OA）作为起始剂（烷基链），通过改变环氧乙烷（EO）和环氧丙烷（PO）单元的用量和顺序，制备了具有不同聚醚链的聚醚消泡剂。在水溶液、新拌砂浆和硬化砂浆中测试了不同消泡剂的性能，从而研究了消泡剂的结构-性能关系。结果表明，聚醚消泡剂的消泡能力随EO用量的增加而降低，同时连接有EO和PO单元（PO在EO之前）的消泡剂比仅连接EO的消泡剂具有更强的消泡能力。本研究有助于新型合成聚醚型混凝土消泡剂的开发与应用。
