| Effect of Liquid Phase Modification on Active Sites of Silica Surface |
| Received:November 06, 2019 Revised:November 08, 2019 |
| DOI：10.12136/j.issn.1000-890X.2020.06.0410 |
| Key Words: silica；active site；liquid phase modification；silane coupling agent；dispersant；NR；masterbatch |
| Author Name | Affiliation | E-mail | | ZHANG Liang | Beijing University of Chemical Technology | 2298367120@qq.com | | LI Xiaolin* | Beijing University of Chemical Technology | lixl@mail.buct.edu.cn | | HAN Dongli | Beijing University of Chemical Technology | | | LIN Yanxi | Beijing University of Chemical Technology | |
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| Abstract: |
| In this study，silica was modified in liquid phase by using silane coupling agent KH590 and dispersant MOA to get modified silica slurry. Then natural rubber （NR）/silica masterbatches were prepared by dry-mixing method and wet-mixing method，respectively. The coupling agent Si69 was added to masterbatches during subsequent mixing，NR/silica nanocomposites were obtained and their properties were studied，and whether there were resiclual active sites on the liquid phase modified silica surface to react with coupling agent Si69 was investigated. The results showed that the coupling agent Si69 added subsequently could not be grafted on the silica surface to play coupling role，and the dispersion of silica in the rubber matrix and the performance of NR/silica nanocomposites were not improved with the addition of coupling agent Si69. The active sites on the liquid phase modified silica surface were all occupied. |
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