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Article contents

Interaccion de isocianatos con sepiolita

Published online by Cambridge University Press:  09 July 2018

M. N. Fernandez Hernandez
Affiliation:
Sección de Físico-Química de Arcillas, Instituto de Edafología y Biologia Vegetal, Consejo Superior de Investigaciones Cientificas, c/Serrano 115 dpdo., Madrid 6, España
E. Ruiz Hitzky
Affiliation:
Sección de Físico-Química de Arcillas, Instituto de Edafología y Biologia Vegetal, Consejo Superior de Investigaciones Cientificas, c/Serrano 115 dpdo., Madrid 6, España

Resumen

Se estudia la interacción del isocianato de butilo y del isocianato de fenilo con sepiolita, utilizando las técnicas de espectroscopía IR y anáilisis químico. En determinadas condiciones experimentales se produce un injerto de grupos orgánicos sobre la superficie mineral por formación de enlaces tipo uretano ≡ Si-O-CO-NH-R. Se ha puesto de manifiesto que el agua adsorbida sobre la superficie mineral, tiende a formar ureas simétricamente disustituídas como sub-producto de la reacción.

Abstract

Abstract

The interaction of butyl and phenyl isocyanate with sepiolite has been studied by IR spectroscopy and chemical analysis techniques. Adsorbing of the organic species on the mineral surface through the formation of urethane-like bonds of the form ≡ Si-O-CO-NH-R is observed under specific conditions. The adsorbing reaction is perturbed by the adsorbed water, which tends to hydrolyze the isocyanate with formation of 1, 3-ureas as subproducts.

Kurzreferat

Kurzreferat

Die Wechselwirkung von Butyl- und Phenylisocyanat mit Sepiolit wurde unter Anwendung von I.R. Spektroskopie und chemische Analyseverfahren erforscht. Unter bestimmten Bedingungen wird Adsorption der organischen Arten auf der Oberfläche des Minerals durch das Entstehen von urethanartigen Verbindungen der Form ≡ Si-O-CO-NH-R beobachtet. Die Adsorptionsreaktion wird durch das adsorbierte Wasser gestört, das Hydrolyse des Isocyanats zu bewirken neigt, wobei 1,3-Harnstoff als Nebenprodukt gebildet wird.

Résumé

Résumé

L'interaction de l'isocyanate de butyle et de phényle avec la sépiolite a été étudiée par des techniques de spectroscopie infrarouge et d'analyse chimique. L'adsorption des espèces organiques sur la surface du minéral par formation de liaisons type uréthane de la forme ≡ Si-O-CO-NH-R est observée dans des conditions bien déerminées. La réaction d'adsorption est perturbée par l'eau adsorbée, qui tend à hydroliser l'isocyanate avec formation d'1,3-urées comme sous-produits.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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