Modeling and practice of ethanol-devolatilization of silica-silane rubber compounds in an internal mixer / W. K. Dierkes in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 3 (07/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 3 (07/2007) . - p. 259-265 Titre : Modeling and practice of ethanol-devolatilization of silica-silane rubber compounds in an internal mixer Type de document : texte imprimé Auteurs : W. K. Dierkes, Auteur ; J. W. M. Noordermeer, Auteur Année de publication : 2007 Article en page(s) : p. 259-265 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : During mixing of a rubber compound containing silica and silane, the mixer is not only used for the dispersion of the filler and other ingredients, but also for a chemical reaction. These two functionalities of the mixer result in opposite processing requirements: A good dispersion is reached by high shearing forces, increasing the compound temperature. The silanization is not dependent on high shearing forces; it is positively influenced by high temperatures, but with an increasing risk of scorch. Another drawback is the equilibrium between the ethanol concentration in the vapor phase in the void space of the mixing chamber and in the rubber phase, which is limiting the reaction rate of the silanization. Devolatilization of the compound is a crucial factor for the efficiency of the silanization reaction. In this article a model for devolatilization of a rubber compound in an internal mixer is developed, including a chemical reaction replenishing the volatile component during the devolatilization process. The model is based on the penetration theory, with the main contribution to the devolatilization being convective mass transfer. The main influencing factors, theoretically deducted and practically verified, are temperature, mixer volume, fill factor, rotor speed, reaction time and partial pressure of the volatile component in the void volume of the mixer. DOI : 10.3139/217.0010 En ligne : https://drive.google.com/file/d/19Abh74NUexM3kOpIiTmeDixAW1W662EN/view?usp=drive [...] Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2703 [article]

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State of the art : recycling of EPDM rubber vulcanizates / P. Sutanto in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 2 (05/2006) . - p. 211-217 Titre : State of the art : recycling of EPDM rubber vulcanizates Type de document : texte imprimé Auteurs : P. Sutanto, Auteur ; J. W. M. Noordermeer, Auteur ; W. K. Dierkes, Auteur ; K. A. J. Dijkhuis, Auteur ; L. P. B. M. Janssen, Auteur ; F. Picchioni, Auteur Année de publication : 2006 Article en page(s) : p. 211-217 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Since the past few decades, environmental issues have become a serious concern in society. It is a requisite for the industry tominimize waste, in order to protect the environment from being polluted. The term waste here comprises processing waste and post-consumer waste. The amount of processing waste should not be underestimated since it might consist of approximately 10% of the total production. The recycling of EPDM rubber is an interesting topic, especially if considered in connection with the continuous market growth of EPDM. This paper is a summary of efforts that have been taken so far on this subject. Studies done on EPDM recycling include reusing EPDM as filler in new rubber products and chemical, thermal, and mechanical devulcanization of EPDM in order to achieve a material that resembles the virgin one and could be revulcanized. Such studies on EPDM recycling are discussed extensively and in the conceptual frame of more general rubber recycling processes. DOI : 10.3139/217.1906 En ligne : https://drive.google.com/file/d/1abzODi-xDPEVwM2xjGeVsI638sHV6MgC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2916 [article]

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