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Modeling and practice of ethanol-devolatilization of silica-silane rubber compounds in an internal mixer 内混炼机中乙醇-硅烷橡胶化合物脱挥发的模拟与实践
IF 0.4 4区 工程技术 Q4 Engineering Pub Date : 2007-05-11 DOI: 10.1163/EJ.9789067644525.I-410.35
W. Dierkes
During mixing of a silica-silane rubber compound, the mixer is not only used for dispersion, but also for a chemical reaction. A good dispersion is reached by high shearing forces, preferably applied at lower temperatures, whereas the reaction rate of the silanization is increased with increasing temperature, but at the expense of scorch safety. Another limiting factor for the silanization reaction is the ethanol concentration, requiring effective devolatilization of the compound. A model for the devolatilization of a silica compound in an internal mixer is theoretically derived and experimentally verified. The most important factors are identified: the frequency of surface renewal and the surface-to-volume ratio of the compound as well as a low ethanol pressure in the void space of the mixer are the main contributors.
在硅烷橡胶混合物的混合过程中,混合器不仅用于分散,而且还用于化学反应。高剪切力(最好在较低温度下施加)可达到良好的分散效果,而硅烷化反应速率随温度升高而提高,但以牺牲焦化安全性为代价。硅烷化反应的另一个限制因素是乙醇浓度,这需要化合物的有效脱挥发。本文从理论上推导了一种硅化合物在内部混合器中脱挥发的模型,并进行了实验验证。确定了最重要的因素:表面更新的频率和化合物的表面与体积比以及混合器空隙空间中的低乙醇压力是主要因素。
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引用次数: 6
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Kgk-kautschuk Gummi Kunststoffe
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