Silane-treated clay production method, silane-treated clay...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 9/06 (2006.01) B32B 19/00 (2006.01) B60C 1/00 (2006.01) B60C 5/00 (2006.01) B60C 13/04 (2006.01) C04B 20/10 (2006.01) C08K 3/34 (2006.01)

Patent

CA 2264722

An effective production method for silane-treated clays having exceptional reinforcing effects with respect to rubber, and compositions using these silane-treated clays are offered. With the silane-treated clay production method, a functional silane is predispersed or emulsified in water by means of a surfactant in order to mix the functional silane with kaolin clay and thereby uniformly surface-treat the kaolin clay with the functional silane. The surfactant should preferably be a non-ionic surfactant with an HLB value in the range of 8-18. The silane-treated clay formed by surface-treating kaolin clay by means of these functional silanes characteristically contains low residual levels of the non-ionic surfactants. The functional silanes can be either vinyl or sulfur functional silanes. The silane treated clays are useful as fillers or extenders in rubber compositions, particularly those employing silicas and/or carbon blacks.

Cette invention se rapporte à un procédé efficace de fabrication d'argiles traitées au silane et dotées d'effets renforçateurs exceptionnels en comparaison du caoutchouc, ainsi qu'à des compositions contenant de telles argiles traitées au silane. Ledit procédé de fabrication d'argile traitée au silane consiste à disperser préalablement ou à émulsionner un silane fonctionnel dans de l'eau en utilisant un agent tensioactif de manière à mélanger ledit silane fonctionnel avec du kaolin et à traiter uniformément en surface le kaolin avec ledit silane fonctionnel. De préférence, le tensioactif est un tensioactif non ionique possédant un rapport hydrophile-lipophile compris entre 8 et 18. L'argile traitée au silane, que l'on obtient en traitant en surface du kaolin avec ces silanes fonctionnels, présente de manière caractéristique, de faibles teneurs résiduelles en tensioactifs non ioniques. Les silanes fonctionnels utilisés peuvent être des silanes fonctionnels vinyliques ou sulfurés. Ces argiles traitées au silane s'avèrent utiles en tant que charges ou allonges dans les compositions de caoutchouc, et notamment dans celles incorporant de la silice et/ou du noir de carbone.

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