Preparation of polycarboxylate superplasticizer with uniform composition based on reactivity ratio

被引：0
|
作者：
Zhao M. [1 ]
Wang Z. [1 ]
Liu X. [1 ]
Wang Y. [1 ]
Guo J. [2 ]
Zhang G. [2 ]
机构：
[1] Department of Materials and Manufacturing, Beijing University of Technology, Beijing
[2] Liaoning Provincial Transportation Planning and Design Institute Co., Ltd., Liaoning, Shenyang
来源：
Jingxi Huagong/Fine Chemicals | 2024年 / 41卷 / 06期
关键词：
construction chemicals; controlled feeding process; dispersing properties; polycarboxylate superplasticizer; reactivity ratio; structure parameters;
D O I：
10.13550/j.jxhg.20230462
中图分类号：
学科分类号：
摘要：
Based on the reactivity ratio of comonomers of polycarboxylic acid superplasticizer (PCE) obtained by experiment, the supplemental time and amount of acrylic acid (AA) were determined by controlling the conversion rate and active monomer addition through theoretical calculation and experimental test results, so that the monomer composition of AA and macromonomer methyl allyl polyethylene glycol (MAPEG) remained unchanged in the copolymerization system to ensure the consistency of the copolymer composition synthesized at different time point. The composition difference of the copolymers obtained from controlled feeding process (CFP) and traditional feeding processes (TFP) was compared in order to systematically study the accuracy and reliability of CFP, and the effect of copolymer composition on its dispersion performance was investigated. The results showed that in the process of PCE preparation by CFP based on reactivity ratio, AA consumed faster in stage, which addition inhibited the variation amplitude of AA and MAPEG in the instantaneous composition of copolymer, and the average acid/ether ratio [n(AA)/n(MAPEG)] of PCE prepared by CFP were 2.8, 3.8 and 4.8, respectively, which were basically consistent with the designed values (3.0, 4.0, 5.0). The PCE prepared by CFP showed higher average main chain length, carboxyl content and macromonomer content, which increased the coverage area and adsorption layer thickness of PCE, thus improving the initial fluidity and fluidity retaining ability when used in cement paste. © 2024 Fine Chemicals. All rights reserved.
引用
收藏
页码：1382 / 1392
页数：10
相关论文
共 32 条
  • [1] WANG Z M, Polycarboxylic acid series high-performance water-reducing agent: Preparation, performance and application, (2009)
  • [2] ZHANG S C, WEN Y F, YANG Y G, Measurement of activity ratio in AN-AIA polymerization and co-monomer content control, Hi-Tech Fiber & Application (高科技纤维与应用), 4, pp. 25-29, (2006)
  • [3] XIE L J, ZHANG G H, DONG X, Et al., Preparation and anti-mud function of EPEG polycarboxylate superplasticizers with different phosphate monomers, Fine Chemicals, 39, 11, pp. 2371-2376, (2022)
  • [4] YING S K, YU F N, Copolymerization principle, (1984)
  • [5] QIU F, FAN L, Lignin modified polycarboxylic superplasticizer (Ⅰ)-synthesis, characterization and properties, Fine Chemicals, 36, 12, pp. 2512-2520, (2019)
  • [6] SUN Y S, ZHONG Z E, Study on the polymerization technology and kinetics of the polycarboxylic type water-reducer, Journal of Nanchang University (Engineering Edition), 28, 1, pp. 15-18, (2006)
  • [7] WANG Z M, ZHAO M L, ZHANG Y, Structure formation process of copolymerization of methyl allyl polyethylene glycol with acrylic acid, Chemical Reaction Engineering and Technology, 35, 3, pp. 234-241, (2019)
  • [8] FENG Z J, WANG S H, FU Y F, Et al., Binary polymerization of TPEG polyether superplasticizer, The 14th Congress of China Building Materials Federation Concrete Admixture Branch-"Cologne Cup" Paper Collection of Concrete Admixture, (2014)
  • [9] ZHOU D L, YANG Y, CHEN L, Et al., Study on the polymerization kinetics of polycarboxylate superplasticizers, Chemical Research and Application, 30, 7, pp. 1158-1163, (2018)
  • [10] MATYJASZEWSKI K, PAIK H J, ZHOU P, Et al., Determination of activation and deactivation rate constants of model compounds in atom transfer radical polymerization, Macromolecules, 34, 15, pp. 5125-5131, (2001)
1234