Method of making a water reducing additive for cement

Details Method of making a water reducing additive for cement Method of making a water reducing additive for cement

C - Chemistry, Metallurgy

08

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261/56.4

C08F 283/06 (2006.01) C08F 20/00 (2006.01) C08G 65/332 (2006.01) C04B 24/04 (2006.01) C04B 24/26 (2006.01) C04B 24/32 (2006.01)

Patent

CA 2290528

Substances useful as water reducing and superplasticizer additives for cement compositions are formed by in situ polymerization of one or more ethylenically unsaturated acid monomers such as acrylic acid or maleic anhydride in a reaction medium comprising a polyether such as polypropylene glycol or a copolymer of ethylene oxide and propylene oxide to form a carboxylic acid polymer, followed by reaction of the polyether and carboxylic acid polymer. The composition and properties of the resulting additives may be readily varied as desired through the use of different acid monomers, polyethers, reaction conditions, reagent proportions and the like.

On prépare des substances utiles en tant qu'additifs réducteurs d'eau et superplastifiants pour des compositions de ciment par polymérisation in situ d'un ou de plusieurs monomères éthylèniquement insaturés, tels que de l'acide acrylique ou de l'anhydride maléïque, dans un milieu réactionnel composé d'un polyéther, tel que polypropylène glycol, ou d'un copolymère d'oxyde d'éthylène et d'oxyde de propylène, afin d'obtenir un polymère d'acide carboxylique, suivie par la réaction du polyéther et du polymère d'acide carboxylique. On peut modifier sans difficultés la composition et les propriétés des additifs obtenus au moyen de la mise en application de différents monomères d'acides ou polyéthers, ou de différentes conditions réactionnelles ou proportions de réactifs.

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