| 摘要 |
1. A method of inhibiting the formation, deposition and adherence of scale forming salts in an aqueous system having a pH of at least 8.5 and a calcite saturation level of at least 100 times the solubility limit of calcium as calcite, comprising adding to said aqueous system a composition comprising components (A) to (D) as follows: component (A): a polyether polyamino methylene phosphonate of the formula: <CHEM> where n is an integer or fractional integer which is, or on average is, from 2 to 12, inclusive; M is hydrogen or an alkali metal; and each R may be the same or different and is independently selected from hydrogen and methyl; component (B) : a component which is either a terpolymer comprising the monomers of acrylic acid, sulfophenoxymethallyl ether and maleic acid, wherein said terpolymer has a weight average molecular weight in the range from about 4,000 to 10,000 or a composition comprising a mixture of a polymaleic acid and a copolymer of acrylic acid and sulfophenoxymethyl ether having a weight average molecular weight of from 4,000 to 10,000; component (C) : a hydroxyphosphonoacetic acid; and component (D) : a phosphonocarboxylic acid copolymer comprising the monomers of acrylic acid, telomer with (1-hydroxy-1-methylethyl) phosphinic acid monosodium salt and 2-acrylamido 2 methyl propane sulfonic acid. |
