Composite scale inhibitor and preparation method thereof

Abstract

The invention relates to the technical field of scale inhibitors, particularly relates to a phosphorus-free and environment-friendly novel composite scale inhibitor which has stable performance and can solve the problem that the traditional polyphosphate scale inhibitor is easy to hydrolyze and has a poor calcium sulfate scale inhibition effect, and specifically relates to a composite scale inhibitor and a preparation method thereof. The composite scale inhibitor comprises the following raw material components in parts by weight: 12-20 parts of an itaconic acid-polyaspartic acid copolymer, 12-18 parts of an ethylene glycol itaconic acid-acrylamide-2-methyl propanesulfonic acid-maleic acid copolymer, 2-8 parts of sulfamic acid, 8-15 parts of sodium hydroxide, 1-5 parts of a surfactant and 46-52 parts of water. The compound scale inhibitor is small in dosage, not prone to scaling after being used and high in scale inhibition rate, the itaconic acid-polyaspartic acid copolymer in the compound scale inhibitor has very high temperature resistance and has scale inhibition and corrosion inhibition effects, itaconic acid is inserted into polymer molecules, and therefore, the scale inhibition and removal performances of the compound scale inhibitor are greatly superior to those of polyphosphate scale inhibitors.

Description

technical field [0001] The invention relates to the technical field of scale inhibitors, in particular to a new compound scale inhibitor which is non-phosphorus, environmentally friendly, stable in performance, and capable of solving the problem of easy hydrolysis of traditional polyphosphate scale inhibitors and poor effect of inhibiting calcium sulfate scale. A compound scale inhibitor and a preparation method thereof. Background technique [0002] Scale inhibitors are a class of agents that can disperse insoluble inorganic salts in water, prevent or interfere with the precipitation and scaling of insoluble inorganic salts on metal surfaces, and maintain good heat transfer effects on metal equipment. [0003] The most commonly used scale inhibitors are metal salts of polyphosphoric acid. However, this kind of antiscalant is easy to hydrolyze after adding, and in the later stage, it may happen that the antiscalant is exhausted before the next feeding, resulting in scaling....

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Problems solved by technology

However, this kind of antiscalant is easy to hydrolyze after adding, and in the later stage, it may happen that the antiscalant is exhausted before the next feeding, resulting in scaling

[0004] In addition, due to the low solubility of calcium phosphate, when the concentration of orthophosphate ions produced by the hydrolysis of polyphosphate is too high, not only can it not achieve the effect of scale inhibition, but the formation of calcium phosphate scaling is far more than that caused by calcium carbonate and calcium sulfate. Structure is more difficult to remove

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