Synthesis, Properties and Mechanism of Citric Acid Modified Low-molecular-weight Superplasticizers
LU Tong1, QIAN Shanshan1,*, LIU Xiao2, GAO Ruijun3, ZHENG Chunyang1
1 Jiangsu Province Engineering Research Center (ARIT) of Concrete Polymer Additives, Jiangsu ARIT New Materials Co., Ltd., Nanjing 211505, China 2 Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China 3 China Building Materials Academy, Beijing 100024, China
Abstract: Citric acid modified low-molecular-weight superplasticizers (LMWS) was prepared by esterification reaction with citric acid (CA) and methoxy polyethylene polypropylene glycols (MPEPPG) as main raw materials. The superplasticizers were tested by Fourier transform infrared spectrometer (FTIR), 1H nuclear magnetic resonance (1H NMR) and gel permeation chromatography (GPC) to obtain structural parameters. Meanwhile, the comprehensive performance of LMWS with the same acid-ether ratio (n(CA)∶n(MPEPPG)=1∶1) and different molecular weight was compared by the dynamic light scattering (DLS), Zeta potential of cement paste, the adsorption performance of superplasticizers on cement, setting time of cement paste, cement hydration heat, plastic viscosity, fluidity of cement paste and concrete performance. The results showed that under the condition of same dosage, LMWS-3 with moderate molecular weight significantly reduces the plastic viscosity of cement paste and delays the hydration process of cement, and also has excellent initial dispersion and dispersion retention performance.
1 Aitcin P C. Cement and Concrete Research, 2000, 30(9), 1349. 2 Song J L, Zhou Z M, Li C C, et al. Materials Reports, 2014, 28(S2), 280 (in Chinese). 宋加乐, 周智密, 李禅禅, 等. 材料导报, 2014, 28(S2), 280. 3 Wang L, Zhao X, Gao R J, et al. New Building Materials, 2016, 43(7), 1 (in Chinese). 王玲, 赵霞, 高瑞军, 等. 新型建筑材料, 2016, 43(7), 1. 4 Ma J F, Wang T, Qi S, et al. Colloid and Polymer Science, 2018, 296(3), 503. 5 Qi S, Wang T, Fan S M, et al. Advances in Cement Research, 2019, 31(9), 399. 6 Qi S, Wang T, Han Z, et al. Advances in Cement Research, 2020, 32(11), 492. 7 Lei L, Zhang Y, Li R. Cement and Concrete Research, 2021, 147, 106504. 8 Ilg M, Plank J. Colloids and Surfaces A: Physicochemical and Enginee-ring Aspects, 2020, 587, 124307. 9 Xu Q, Xing F L, Xue H Y, et al. Chemical Industry and Engineering Progress, 2001, 21(8), 576 (in Chinese). 徐群, 邢凤兰, 薛红艳, 等. 化工进展, 2001, 21(8), 576. 10 Moschner G, Lothenbach B, Figi R, et al. Cement and Concrete Research, 2009, 39(4), 275. 11 Xia Q, Li X, Jiang L H. Materials Reports, 2011, 25(S2), 288 (in Chinese). 夏强, 李晓, 蒋林华. 材料导报, 2011, 25(S2), 288. 12 Wang W P, Lyu X Y, Ding W L, et al. New Building Materials, 2012, 39(7), 9 (in Chinese). 王文平, 吕晓勇, 丁伟良, 等. 新型建筑材料, 2012, 39(7), 9. 13 Lu S H, Liu G, Ma Y F, et al. Journal of Applied Polymer Science, 2010, 117(1), 273. 14 Ilg M, Plank J. Industrial & Engineering Chemistry Research, 2019, 58(29), 12913. 15 Tan H B, Zou F B, Ma B G, et al. Construction and Building Materials, 2016, 126, 617. 16 Qian S S, Yao Y, Wang Z M, et al. Materials Reports, 2021, 35(2), 2046 (in Chinese). 钱珊珊, 姚燕, 王子明, 等. 材料导报, 2021, 35(2), 2046. 17 Li H Q, Yao Y, Wang Z M, et al. Journal of the Chinese Ceramic Society, 2020, 48(2), 246 (in Chinese). 李慧群, 姚燕, 王子明, 等. 硅酸盐学报, 2020, 48(2), 246.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2024, Vol. 38 
