Abstract
Preparation of hydrophobic precipitated silica nanoparticles by carbonation reaction using CO2 greenhouse gas instead of inorganic acid with the Na2SiO3 solutions has attracted widespread concern. Polymer surface modifiers may become inactive owing to the pH value of the reaction system changes constantly during the carbonation and In-situ surface modification process. Therefore, the effects of the position of adding 3-methacryloxypropyltrmethoxysilane (KH570) modifier on physicochemical performance and surface chemistry structure of precipitated silica nanoparticles were investigated during carbonation, and the in-situ modification process parameters were researched in the optimal modification position. The result demonstrates that the optimum in-situ modification position is the rear stage of carbonation process, and KH570 is mainly grafted to the surface of silica by chemical bond rather than physical adsorption. The optimum in-situ modification condition was obtained from the single factor tests: modification temperature of 80° C, modifier dosage of 2%, modification time of 40 min and pH value of 7 – 8. The average activation index of precipitated silica nanoparticles is nearly 100% under optimum in-situ modification condition. These hydrophobic precipitated silica nanoparticles are promising in hydrophobic filler materials.
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This work was financially supported by Applied Basic Research Plan of Yunnan Province (No. 2017FD128) and Scientific Research Fund Project of Kunming Metallurgical College (No. 2019XJZK06).
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Zhang, J., Lu, P., Teng, Y. et al. In-situ surface modification of precipitated silica nanoparticles with 3-methacryloxypropyltrimethoxysilane in carbonation process. Res Chem Intermed 47, 3037–3050 (2021). https://doi.org/10.1007/s11164-021-04452-4
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DOI: https://doi.org/10.1007/s11164-021-04452-4