Defoaming agent for cementitious compositions

Details Defoaming agent for cementitious compositions Defoaming agent for cementitious compositions

C - Chemistry, Metallurgy

04

B

C04B 40/00 (2006.01) C04B 24/16 (2006.01) C04B 24/24 (2006.01) C04B 24/32 (2006.01)

Patent

CA 2506950

A defoaming agent for cementitious compositions is provided, which has an excellent defoaming performance and does not segregate when mixed with a high performance AE water-reducing agent to form a single admixture or when diluted in water at the desired concentration, and which has excellent long term storage properties. The defoaming agent for cementitious compositions is obtained by mixing at least a polyethylene oxide derivative and a nonionic defoaming agent wherein the polyethylene oxide derivative has at one end a hydrophobic group with a branched structure and/or an unsaturated bond and at the other end an anionic group.

L'invention concerne un agent antimousse pour compositions cimentaires, lequel agent présente une excellente performance antimousse, ne se sépare pas lorsqu'il est mélangé à un agent réducteur d'eau entraîneur d'air haute performance pour former un additif unique ou lorsqu'il est dilué dans de l'eau à la concentration souhaitée et présente d'excellentes propriétés de stockage à long terme. On obtient cet agent antimousse pour compositions cimentaires en mélangeant au moins un dérivé d'oxyde de polyéthylène et un agent antimousse non ionique, lequel dérivé d'oxyde de polyéthylène présente à une extrémité un groupe hydrophobe à structure ramifiée et/ou liaison insaturée et un groupe anionique à l'autre extrémité.

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