Gypsum compositions with enhanced resistance to permanent...

Details Gypsum compositions with enhanced resistance to permanent... Gypsum compositions with enhanced resistance to permanent...

C - Chemistry, Metallurgy

04

B

C04B 28/14 (2006.01) C04B 20/10 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2395059

A set of gypsum-containing composition is disclosed. In one aspect, the set gypsum-containing composition includes an interlocking matrix of the set gypsum formed from at least calcined gypsum, water, and an enhancing material. The enhancing material can be selected from (i) an organic polyphosphonic compound, or a mixture thereof; (ii) a borate selected from ulexite colemanite, or a mixxture thereof; of a mixture of (i) and (ii). In another aspect, the set gypsum-containing composition is treated with an enhancing material which can be selected from (i) an organic phosphonic compound or a mixture thereof; (ii) a borate selected from ulexite, colemanite, or a mixture thereof; (iii) a carboxylic compound or a mixture thereof; or a mixture of (i), (ii) and/or (iii).

L'invention concerne une composition de plâtre durci qui, selon un aspect de l'invention, contient une matrice de cristaux enchevêtrés, constituée de plâtre durci formé à partir de gypse calciné, d'eau et d'un matériau activateur. Ce dernier peut être sélectionné parmi (i) un composé polyphosphonique organique, ou un mélange de ce dernier ; (ii) un borate sélectionné parmi l'ulexite ou la colémanite, ou un mélange de ce borate ; ou un mélange de (i) et de (ii). Selon un autre aspect de l'invention, la composition de plâtre durci est traitée avec un matériau activateur pouvant être sélectionné parmi (i) un composé phosphonique organique, ou un mélange de ce dernier ; (ii) un borate sélectionné parmi l'ulexite ou la colémanite, ou un mélange de ce borate ; (iii) un composé carboxylique ou un mélange de ce dernier ; ou un mélange de (i),(ii) et/ou de (iii).

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