Fluid loss concentrate for hydraulic cement

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/487 (2006.01) C04B 24/26 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2574782

A fluid loss additive for hydraulic cement, comprising a polyvinyl alcohol resin and a fluid loss ameliorating sulfonic acid-functionalized co-resin, where the polyvinyl alcohol has a characteristic viscosity in the range of about 1 to about 25 cps. The invention includes, in some embodiments, an aqueous concentrate of the PVOH resin and the sulfonic acid-functionalized co- resin, where the total resin content is in the range of about 10 % to about 40 % and the viscosity is less than 15,000 cps. By way of the invention it is possible to adjust hydraulic cement slurry characteristics in real time upon demand and reduce inventory by providing a concentrated aqueous fluid loss additive.

La présente invention concerne un additif empêchant la perte de fluide pour ciment hydraulique, comprenant une résine d~alcool polyvinylique et une co-résine fonctionnalisée par l~acide sulfonique améliorant la perte de fluide, dans lequel l~alcool polyvinylique présente une viscosité caractéristique se situant dans un intervalle d~environ 1 à environ 25 cps. L~invention comprend, dans certains modes de réalisation, un concentré aqueux de la résine PVOH et la co-résine fonctionnalisée par l~acide sulfonique, dans laquelle la teneur totale en résine se situe dans un intervalle d~environ 10 % à environ 40 % et la viscosité est inférieure à 15 000 cps. Au titre de l~invention il est possible de régler les caractéristiques du coulis du ciment hydraulique en temps réel à la demande et de réduire les stocks en fournissant un additif aqueux concentré empêchant la perte de fluide.

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