| 苯基三甲氧基硅烷改性纳米二氧化硅的制备及其应用 |
| Preparation and Application of Nano Silica Modified by Phenyltrimethoxysilane |
| 投稿时间：2020-12-03 修订日期：2020-12-03 |
| DOI：10.12136/j.issn.1000-890X.2021.09.0664 |
| 中文关键词: 纳米二氧化硅 苯基三甲氧基硅烷 改性 工艺条件 活化度 表面羟基数 丁苯橡胶 |
| 英文关键词: nano silica PTMS modification process condition activation degree surface hydroxyl group number SBR |
| 基金项目:国家自然科学基金资助项目（20671045）；江苏省绿色催化材料与技术重点实验室开放课题资助项目（BM2012110） |
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| 中文摘要: |
| 采用偶联剂苯基三甲氧基硅烷（PTMS）对纳米二氧化硅进行改性，研究反应温度、反应体系pH值、反应时间及偶联剂PTMS用量对改性纳米二氧化硅活化度和表面羟基数的影响，采用X射线衍射分析、热重分析、傅里叶变换红外光谱分析和透射电子显微镜分析等对改性前后纳米二氧化硅结构进行表征，考察改性纳米二氧化硅对丁苯橡胶（SBR）的补强效果。结果表明：当反应温度为80 ℃、反应体系pH值为3. 5、反应时间为90 min、偶联剂PTMS用量为纳米二氧化硅用量的6. 85%时，改性纳米二氧化硅的活化度达到100%，表面羟基数最小，为0. 99个·nm-2；与使用未改性纳米二氧化硅补强的SBR胶料相比，使用改性纳米二氧化硅（优化工艺条件下改性）补强的SBR胶料的门尼粘度明显下降，t90明显缩短，拉伸强度提高4. 5%，拉断伸长率提高9%，DIN磨耗量降低21%。 |
| 英文摘要: |
| 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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