Modified landplaster as a wallboard filler

Details Modified landplaster as a wallboard filler Modified landplaster as a wallboard filler

C - Chemistry, Metallurgy

04

B

C04B 28/14 (2006.01) B32B 13/08 (2006.01) E04C 2/284 (2006.01)

Patent

CA 2619960

A gypsum slurry includes calcium sulfate hemihydrate, water and calcium sulfate dihydrate is coated with a hydrophilic, dispersible coating. The coating is less soluble than the calcium sulfate hemihydrate to delay exposure of the landplaster to the remainder of the slurry, preventing premature crystallization and the early stiffening that accompanies it. Another embodiment is a gypsum slurry that includes calcium sulfate hemihydrate, a polycarboxylate dispersant, water and coated calcium sulfate dihydrate. In this case, the hydrophilic, dispersible coating is selected to serve as a modifier to enhance the ability of the dispersant to fluidize the gypsum slurry.

L'invention concerne une pâte de gypse comprenant du semi-hydrate de sulfate de calcium, de l'eau et du dihydrate de sulfate de calcium enduit d'un revêtement dispersible et hydrophile. Le revêtement est moins soluble que le semi-hydrate de sulfate de calcium afin de retarder l'exposition du plâtre fin au reste de la pâte, empêchant ainsi une cristallisation prématurée et le raidissement précoce l'accompagnant. Un autre mode de réalisation concerne une pâte de gypse comprenant du semi-hydrate de sulfate de calcium, un dispersant à base de polycarboxylate, de l'eau et du dihydrate de sulfate de calcium enduit. Dans ce cas, le revêtement dispersible et hydrophile est choisi de manière à servir de modificateur afin d'améliorer la capacité du dispersant à fluidiser la pâte de gypse.

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