Processes for making silane, hydrophobated silica, silica...

C - Chemistry – Metallurgy – 07 – F

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Details

C07F 7/18 (2006.01) B60C 1/00 (2006.01) C08J 3/22 (2006.01) C08K 5/548 (2006.01) C08L 21/02 (2006.01)

Patent

CA 2724798

A process for making silica-filled rubber masterbatch using silica hydrophobated with a trimethoxy silane coupling agent. One embodiment uses a mixture of trimethoxy silanes, one or more of which react with rubber to bond the silica to the rubber, and one or more of which do not react with rubber, but do hydrophobate the silica. Hydrophobated silica is mixed with latex polymer and incorporated into rubber during coagulation of the latex, which is preferably coagulated with calcium chloride. The present invention further provides a process for making the trimethoxy silane coupling agents. Preferred trimethoxy silane coupling agents include bis-(3-trimethoxysilylpropyl)disulfide and bis-(3- trimethoxysilylpropyl)-tetrasulfide. Long scorch time of the inventive silica masterbatch allows rubber products, particularly tires, to be compounded at length.

L'invention concerne un procédé de préparation d'un mélange maître de caoutchouc chargé en silice employant une silice hydrophobée avec un agent de couplage triméthoxysilane. Un mode de réalisation emploie un mélange de triméthoxysilanes, dont un ou plusieurs réagissent avec le caoutchouc pour lier la silice au caoutchouc, et un ou plusieurs ne réagissent pas avec le caoutchouc, mais hydrophobent la silice. La silice hydrophobée est mélangée avec un polymère de latex et incorporée dans le caoutchouc pendant la coagulation du latex, qui est de préférence coagulé avec du chlorure de calcium. La présente invention concerne en outre un procédé de préparation des agents de couplage triméthoxysilanes. Les agents de couplage triméthoxysilanes comprennent du bis-(3-triméthoxysilylpropyl)disulfure et du bis-(3-triméthoxysilylpropyl)-tétrasulfure. La longue durée de grillage du mélange maître de silice de l'invention permet de mélanger pendant une longue durée des produits de caoutchouc, en particulier des pneus.

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