文章摘要
Preparation and Application of Nano Silica Modified by Phenyltrimethoxysilane
Received:December 03, 2020  Revised:December 03, 2020
DOI：10.12136/j.issn.1000-890X.2021.09.0664
Key Words: nano silica；PTMS；modification；process condition；activation degree；surface hydroxyl group number；SBR
Author NameAffiliationE-mail
ZHOU　Lei Changzhou University 1670713398@qq.com 
LI Xiaodong Jiangsu Novoray Corporation  
CAO Jiakai Jiangsu Novoray Corporation  
ZHANG Haowen Changzhou University  
SUN Xiaoyao Jiangsu Novoray Corporation  
GUO Dengfeng* Changzhou University gdf166@163.com 
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Abstract:
      In this study，nano silica was modified by coupling agent phenyltrimethoxysilane（PTMS），and the effects of the reaction temperature，pH value of the reaction system，reaction time and amount of PTMS on the activation degree and surface hydroxyl group number of the modified nano silica were studied.The structure of nano silica before and after modification was characterized by X-ray diffraction analysis，thermogravimetric analysis，Fourier transform infrared spectroscopy analysis，and transmission electron microscope analysis. The reinforcing effects of modified nano silica on styrene butadiene rubber（SBR）were also investigated. The results showed that，when the reaction temperature was 80 ℃，the pH value of the reaction system was 3. 5，the reaction time was 90 min，and the amount of PTMS was 6. 85% of the weight of nano silica，the activation degree of modified nano silica was 100%，and the surface hydroxyl group number was the smallest，which was 0. 99 nm-2. Compared with the SBR compound reinforced with unmodified nano silica，the Mooney viscosity and t90 of the SBR compound reinforced with the nano silica modified under optimized process conditions decreased significantly，the tensile strength increased by 4. 5%，the elongation at break increased by 9%，and the DIN abrasion loss decreased by 21%.
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