Alkali silicate-polyisocyanate composites

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 18/38 (2006.01)

Patent

CA 2417856

A process for preparing alkali silicate-polyisocyanate composites without catalyst separation. The process involves blending a catalyst and a polyisocyanate to form a first component, and bending an alkali silicate and water to form a second component. The first and second components are then mixed together to form a reactive mixture that reacts to form a hardened composite. The progression of the reaction proceeds without excessive foaming, high exotherms, or the release of an offensive odor. Sodium silicate - polyisocyanate composites prepared according to the above process, and a process for using the alkali silicate - polyisocyanate composites to consolidate and seal various types of formations in mining tunneling, and related construction projects are also disclosed.

La présente invention concerne un procédé pour l'élaboration de composites de silicates alcalins et de polyisocyanates sans séparation catalytique. Le procédé implique le mélange d'un catalyseur avec un polyisocyanate de façon à former un premier composant, puis le mélange d'un silicate alcalin avec de l'eau de façon à former un second composant. On mélange ensuite le premier composant au second composant de façon à obtenir un mélange réactif dont la réaction donne un composite durci. La réaction intervient sans formation excessive de mousse, sans un fort dégagement de chaleur, et sans dégagement d'odeur désagréable. L'invention concerne également des composites de silicates alcalins et de polyisocyanates obtenus selon le procédé de l'invention, mais aussi un procédé permettant d'utiliser ces composites de silicates alcalins et de polyisocyanates pour la consolidation et l'obturation étanche de divers types de formations pour les travaux miniers, de creusement de tunnels, et les autres travaux s'y rapportant.

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