Journal of Polymer Research ( IF 2.8 ) Pub Date : 2021-09-18 , DOI: 10.1007/s10965-021-02745-1 Hui Zhao 1 , Min Deng 1 , Mingshu Tang 1
Superplasticizers (SPs) are an indispensable ingredient to prepare high performance concrete. In the present work, sodium sulfanilate (ASAA), bisphenol A (B) and formaldehyde (F) were used as the reactive monomers, the sustainable aminosulfonate-bisphenol A-formaldehyde (ASBF) SP was synthesized. The functional groups, the weight-average molecular weight (Mw), the number-average molecular weight (Mn), the sulfonation degree (SD), the dispersion properties of ASBF SP were examined. The relationships between the reaction conditions and the molecular structures, the dispersing behaviors of ASBF SP were built. The optimum reaction conditions of ASBF SP are that the molar ratios of B/ASAA, F/(ASAA + B) are 0.625, 1.2, pH value, reaction temperature and reaction time were kept at 10.8, 90–95 °C, 4 h. The molecule of ASBF SP prepared under the optimum reaction conditions has -NH2, -OH, -C6H5, -SO3 groups and Mw, Mn, PDI, SD for 24,716 Da, 16,855 Da, 1.466, 2.257 mmol/g. The adsorption of ASBF SP provides an electrostatic repulsion force to disperse cement particle. -SO3 group on the molecule of ASBF SP takes place complex reaction with calcium ion on cement. The combined affects cause that ASBF SP has the better dispersing capacity for cement particle and dispersing retention in cement slurry.
中文翻译:
一种环保型氨基磺酸盐-双酚A-甲醛减水剂的反应条件、表征和分散性能
减水剂 (SP) 是制备高性能混凝土不可或缺的成分。在目前的工作中,以氨基磺酸钠(ASAA)、双酚A(B)和甲醛(F)为反应单体,合成了可持续氨基磺酸盐-双酚A-甲醛(ASBF)SP。官能团、重均分子量 (M w )、数均分子量 (M n)、磺化度 (SD)、ASBF SP 的分散性能。建立了反应条件与分子结构、ASBF SP 分散行为之间的关系。ASBF SP的最佳反应条件为B/ASAA、F/(ASAA+B)的摩尔比为0.625、1.2,pH值、反应温度和反应时间保持在10.8、90-95℃、4h . 在最佳反应条件下制备的ASBF SP分子具有-NH 2、-OH、-C 6 H 5、-SO 3基团和M w、M n、PDI、SD为24,716 Da、16,855 Da、1.466、2.257 mmol /G。ASBF SP 的吸附提供了一种静电排斥力来分散水泥颗粒。-SO 3ASBF SP 分子上的基团与水泥上的钙离子发生络合反应。综合影响使ASBF SP具有更好的水泥颗粒分散能力和在水泥浆中的分散保持力。