Process for the preparation of sulphur cement or a sulphur...

C - Chemistry – Metallurgy – 04 – B

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C04B 28/36 (2006.01)

Patent

CA 2632850

The present invention provides a process for the preparation of sulphur cement or a sulphur cement-aggregate composite comprising the following steps: (a) admixing at least an inorganic filler and/or aggregate and a polysulphide- containing organosilane having at least two organosilyl groups and allowing the organosilane to react with the inorganic filler and/or aggregate; (b) admixing during or after step (a) elemental sulphur with the inorganic filler and/or aggregate at a temperature at which sulphur is liquid to obtain an admixture comprising molten sulphur and inorganic filler and/or aggregate; and (c) solidifying the admixture to obtain sulphur cement or a sulphur cement- aggregate composite. The invention further provides sulphur cement or a sulphur cement-aggregate composite obtainable by such process and the use of a polysulphide-containing organosilane having at least two organosilyl groups as coupling agent in sulphur cement or a sulphur cement-aggregate composite.

La présente invention concerne un procédé de préparation de ciment au soufre ou d~un composite d~agrégat de ciment au soufre comprenant les étapes consistant à : (a) mélanger au moins une charge inorganique et/ou un agrégat et un organosilane contenant un polysulfure ayant au moins deux groupes organosilyle et permettant la réaction de l~organosilane avec la charge inorganique et/ou l'agrégat ; (b) mélanger durant ou après l~étape (a) du soufre élémentaire avec la charge inorganique et/ou l~agrégat à une température à laquelle le soufre est liquide de façon à obtenir un mélange comprenant du soufre à l~état fondu et une charge inorganique et/ou un agrégat ; et (c) solidifier le mélange de façon à obtenir un ciment au soufre ou un composite d~agrégat de ciment au soufre. L'invention concerne en outre un ciment au soufre ou un composite d~agrégat de ciment au soufre pouvant être obtenu au moyen d~un tel procédé et l'utilisation d'un organosilane contenant un polysulfure ayant au moins deux groupes organosilyle comme agent de couplage dans le ciment au soufre ou un composite d~agrégat de ciment au soufre.

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