Fiberboard with improved water resistance

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 28/14 (2006.01) B32B 25/02 (2006.01) C04B 9/04 (2006.01) C04B 11/00 (2006.01)

Patent

CA 2620373

Articles, including fiberboard, are made from a pumpable, flowable slurry including alpha-calcined calcium sulfate hemihydrate anchored in pores of host particles, alpha-calcined calcium sulfate hemihydrate, a silicone compound, magnesium oxide, and water. The magnesium oxide catalyzes the reaction of the silicone compound into a silicone resin. In a preferred method of making a water resistant fiberboard calcium sulfate dihydrate is combined with the host particles and water to form a slurry which is heated under pressure to calcine the calcium sulfate dihydrate to form alpha-calcined calcium sulfate hemihydrate. After relieving the pressure, a silicone compound and magnesium oxide are added to the slurry. The slurry is dewatered to form a filter cake, which is then formed into a desired shape and allowed to set.

Selon la présente invention, des articles, notamment, des panneaux de fibres sont constitués à partir d'une bouillie pompable, liquide contenant un hémihydrate de sulfate de calcium alpha-calciné ancré dans des pores de particules hôtes, un hémihydrate de sulfate de calcium alpha-calciné, un composé de silicone, un oxyde de magnésium et de l'eau. Cet oxyde de magnésium sert à catalyser la réaction du composé de silicone dans une résine de silicone. Dans un procédé préféré de conception d'un panneau de fibres résistant à l'eau, du dihydrate de sulfate de calcium est mélangé aux particules hôtes et à de l'eau de manière à former une bouillie qui est chauffée sous pression afin de calciner le dihydrate de sulfate de calcium en vue de la formation de l'hémihydrate de sulfate de calcium alpha-calciné. Après libération de la pression, un composé de silicone et un oxyde de magnésium sont ajoutés à la bouillie. Cette dernière est déshydratée pour constituer un gâteau de filtration qui est, ensuite, façonné sous une forme souhaitée et, puis, durci.

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