Effective use of dispersants in wallboard containing foam

Details Effective use of dispersants in wallboard containing foam Effective use of dispersants in wallboard containing foam

C - Chemistry, Metallurgy

04

B

C04B 16/08 (2006.01) C04B 11/00 (2006.01) C04B 16/00 (2006.01) C04B 20/00 (2006.01) C04B 24/08 (2006.01) C04B 24/36 (2006.01) C04B 28/14 (2006.01)

Patent

CA 2609586

Effective use of dispersants in wallboard containing foam results from a method where stucco is mixed with a first dispersant and a first quantity of water to form a gypsum slurry. A soap is blended with a second dispersant and a second quantity of water to make a foam. Subsequently, the foam is combined with the slurry. Choice of different first and second dispersants and their relative amounts allows control of the size distribution of the foam bubbles in the slurry and the resulting voids in the gypsum core. Use of the same dispersant in both the mixer and the foam water provides a boost in efficacy of the dispersant.

L'invention concerne l'utilisation efficace de dispersants dans un panneau de revêtement contenant de la mousse, selon un procédé qui consiste à mélanger du stuc avec un premier dispersant et une première quantité d'eau afin de former une boue de gypse. On mélange un savon avec un second dispersant et une seconde quantité d'eau afin de fabriquer une mousse. Ensuite, on combine la mousse avec la boue. Le choix d'un premier et d'un second dispersants différents et de leurs quantités relatives permet de réguler la distribution granulométrique des bulles de la mousse dans la boue et des vides obtenus dans l'âme de gypse. L'utilisation d'un même dispersant dans le mélange et dans l'eau de la mousse permet de renforcer l'efficacité du dispersant.

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