Method and composition for cleaning a fluid delivery system

C - Chemistry – Metallurgy – 11 – D

Patent

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Details

C11D 3/08 (2006.01) B08B 3/04 (2006.01) B08B 7/00 (2006.01) B08B 9/00 (2006.01) C11D 3/18 (2006.01) C11D 3/43 (2006.01)

Patent

CA 2551007

A composition for cleaning a fluid delivery system includes an agent which controls the rheology of the fluid so that its apparent viscosity decreases as the fluid is subjected to a shear force. In particular applications, the viscosity of the composition is greater than 600 centipoise when it is not subject to any shear and less than 600 centipoise when subject to a shear of at least 10 1/sec. The fluid may be thixotropic or a Bingham plastic, in some instances. In a specific embodiment, the viscosity of the composition is greater than 3000 centipoise when it is not subject to shear, less than 3000 centipoise at a shear of 10 1/sec, less than 1000 centipoise at a shear of 30 1/sec, and less than 600 centipoise at a shear of 60 1/sec. Also disclosed are methods for cleaning a fluid delivery system with these compositions.

La présente invention a trait à une composition pour le nettoyage d'un système de fluide comportant un agent qui contrôle la rhéologie du fluide de sorte que sa viscosité apparente diminue au fur et à mesure que le fluide est soumis à une force de cisaillement. Dans des applications particulières, la viscosité de la composition est supérieure à 600 centipoise lorsqu'il n'est pas soumis à un cisaillement et inférieure à 600 centipoise lorsqu'elle est soumise à un cisaillement d'au moins 10,1/secondes. Le fluide peut être thixotrope ou une matière plastique à écoulement de Bingham, dans certains cas. Dans un mode de réalisation particulier, la viscosité de la composition est supérieure à 3000 centipoise lorsqu'elle n'est pas soumise à un cisaillement, inférieure à 3000 centipoise lorsqu'elle est soumise à un cisaillement de 10,1/secondes, inférieure à 1000 centipoise à un cisaillement de 30,1/secondes, et inférieure à 600 centipoise à un cisaillement de 60,1/secondes. L'invention a également trait à des procédés de nettoyage d'un système de distribution de fluide avec lesdites compositions.

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