Use of a composition based on polyvinyl alcohol

Details Use of a composition based on polyvinyl alcohol Use of a composition based on polyvinyl alcohol

C - Chemistry, Metallurgy

04

B

C04B 24/16 (2006.01) C04B 24/26 (2006.01) C04B 24/30 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2664075

Proposed is the use of a composition based on polyvinyl alcohol (component a) ) as a water-retention agent in mixtures comprising hydraulic binding agents, the component comprising a sulfonated ketone formaldehyde condensation product as a further component with a preferred mixing ratio of 1:1. The component a) may comprise, depending on the respective hydrolysis degree, polyvinyl acetate parts or parts of other polyvinyl esters as well as polymers in general, which can be converted into polyvinyl alcohol by hydrolysis, up to 90 wt.%. Said new composition is used as a water-retention agent in mixtures comprising hydraulic binding agents, and particularly in connection with the exploitation of underground crude oil and natural gas deposits.

L'invention concerne l'utilisation d'une composition à base d'alcool polyvinylique (composant A), qui contient en tant qu'autre composant un produit de condensation de cétone-formaldéhyde sulfoné dans un rapport de mélange préféré de 1:1, en tant qu'agent de rétention d'eau dans des mélanges contenant des liants hydrauliques. Le composant a) peut présenter, en fonction du degré d'hydrolyse respectif, des parts d'acétate polyvinylique ou des parts d'autres esters polyvinyliques ainsi qu'en général des polymères qui peuvent être transformés en alcool polyvinylique par hydrolyse, jusqu'à 90 % en poids. Cette nouvelle composition trouve une utilisation en tant qu'agent de rétention d'eau dans des mélanges contenant des liants hydrauliques et en particulier en rapport avec l'exploitation de gisements de pétrole et de gaz naturel souterrains.

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