Method of stabilizing silica-containing anionic microparticles in hard water

摘要

A method of stabilizing silica-containing anionic microparticles upon mixing of the silica-containing anionic microparticles with hard water comprising adding one or more hardness-abating additives to the hard water prior to mixing of the hard water and the silica-containing anionic microparticles; or adding an effective stabilizing amount of one or more hardness-abating agents to the silica-containing anionic microparticles prior to mixing of the hard water with the silica-containing anionic microparticles and a stabilized composition comprising silica-containing anionic microparticles and an effective stabilizing amount of one or more hardness-abating additives.

主权项

1. A method of stabilizing silica-containing anionic microparticles, the method comprising the steps of:
adding an effective stabilizing amount of one or more hardness-abating agents to the silica-containing anionic microparticles prior to mixing of hard water with the silica-containing anionic microparticles, the hard water having a hardness of at least 60 ppm as calcium carbonate polyvalent cations, wherein the hardness-abating agent is poly(2-acrylamido-2-methyl-1-propane sulfonic acid) having a molecular weight of about 2,000,000.