Polyacrylamide suspensions for soil conditioning

Details Polyacrylamide suspensions for soil conditioning Polyacrylamide suspensions for soil conditioning

C - Chemistry, Metallurgy

09

K

C09K 17/18 (2006.01) C05G 3/00 (2006.01) C08F 20/56 (2006.01) C08J 3/05 (2006.01) C09K 17/16 (2006.01) C09K 17/40 (2006.01)

Patent

CA 2464299

A stable aqueous suspension of water-soluble polyacrylamide particles is in a saturated solution of an ammonium salt. The polyacrylamide particles are characterized by a particle size of about - 150 mesh, and preferably - 270 mesh, with - 400 mesh most preferred. The suspension is at least about 2.5 % by weight polyacrylamide. When the ammonium salt is ammonium sulfate, PAM concentrations as high as about 15 % by weight can be achieved while still being easily flowable. The suspension is made by stirring the small particle PAM into the saturated ammonium salt solution. The PAM can be quickly dissolved to form a less concentrated PAM solution by adding the suspension to water or to a dilute solution, which can include calcium salts or other soil enhancers.

L'invention concerne une suspension aqueuse stable de particules hydrosolubles de polyacrylamide dans une solution saturée de sel d'ammonium. La taille des particules est d'environ 150 mesh, de préférence 270 mesh, et de préférence encore 400 mesh. La suspension comprend au moins environ 2,5 % de polyacrylamide, en poids. Lorsque le sel d'ammonium est du sulfate d'ammonium, on peut obtenir des concentrations de polyacrylamide d'environ 15 %, en poids, tout en conservant un caractère aisément fluidifiable à la suspension. Cette suspension est établie par mélange de petites particules de polyacrylamide sous forme de solution de sel d'ammonium saturée. On peut dissoudre rapidement le polyacrylamide pour élaborer une solution de polyacrylamide moins concentrée, par incorporation de la solution à de l'eau ou à une solution diluée, qui peut comprendre des sels de calcium ou autres substances d'amendement de sol.

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