Gypsum-containing composition having enhanced resistance to...

Details Gypsum-containing composition having enhanced resistance to... Gypsum-containing composition having enhanced resistance to...

C - Chemistry, Metallurgy

04

B

C04B 22/16 (2006.01) C04B 28/14 (2006.01)

Patent

CA 2469606

A composition comprising a mixture of a calcium sulfate material, water, and a tetrametaphosphate compound is disclosed. Desirably, the inclusion of the tetrametaphosphate compound (e.g., salt or ion) in a pre-set treatment of a calcium sulfate material enhances the resistance to permanent deformation (e.g., sag), dimensional stability, and/or compressive strength of the composition while also preferably avoiding any significant retardive effect on the rate of hydration of calcined gypsum to calcium sulfate dihydrate. A set gypsum-containing product and a method for producing a set gypsum-containing product having increased resistance to permanent deformation are also disclosed.

L'invention concerne une composition comprenant un mélange d'un matériau de sulfate de calcium, d'eau, et d'un composé tétramétaphosphate. De préférence, l'ajout du composé tétramétaphosphate (par exemple, sel ou ion) dans un traitement de pré-durcissement d'un matériau de sulfate de calcium augmente la résistance à la déformation permanente (par exemple, l'affaissement), la stabilité dimensionnelle, et/ou la résistance à la compression de la composition tout en évitant également de préférence tout effet à retardement significatif sur le taux d'hydratation du gypse calciné en dihydrate de sulfate de calcium. L'invention concerne également un produit contenant du gypse durci et un procédé de production d'un produit contenant du gypse durci qui présente une résistance améliorée à la déformation permanente.

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