Phosphorus-free scale and corrosion inhibitor and preparation method thereof

Abstract

The invention discloses a phosphorus-free scale and corrosion inhibitor. The phosphorus-free scale and corrosion inhibitor is a compound prepared from organic carboxylic acid and salt thereof, an organic fatty acid polymer, an organic acid type polymer, a chelating agent and de-ionized water and can form a net-shaped composite film on the surface of metal; the weight percent of each component in the compound is as follows: 10 to 30 percent of the organic carboxylic acid, 10 to 20 percent of the organic fatty acid polymer, 5 to 30 percent of the organic acid type polymer, 1 to 5 percent of thechelating agent and the balance of the de-ionized water. The phosphorus-free scale and corrosion inhibitor also can contain inorganic alkali, zinc salt and a cellulose derivative; the weight percent of the inorganic alkali, the zinc salt and the cellulose derivative in the compound is as follows: no more than 6 percent of the inorganic alkali, no more than 4 percent of the zinc salt and no more than 1 percent of the cellulose derivative. The phosphorus-free scale and corrosion inhibitor disclosed by the invention does not contain phosphorus and is an environment-friendly water treatment medicament; the phosphorus-free scale and corrosion inhibitor has excellent performance and can form one layer of the net-shaped composite film on the surface of the metal; the net-shaped composite film hasa remarkable dirt-repelling effect and can be used for preventing the surface of the metal from being scaled.

Description

technical field [0001] The invention belongs to the technical field of circulating water treatment, and relates to water treatment agents, in particular to a phosphorus-free scale and corrosion inhibitor. The invention also provides a preparation method of the phosphorus-free scale and corrosion inhibitor and its application in circulating cooling water treatment. Background technique [0002] The consumption of industrial cooling water accounts for a relatively large proportion of its total water consumption, and the method of circulating cooling and increasing the concentration ratio is usually used to save water consumption. However, in the process of circulating cooling, due to the increase of water temperature and the evaporation of water, various inorganic ions With the concentration of organic matter, the alkalinity, hardness and pH value of the water naturally rise, causing problems such as inorganic salt precipitation, corrosion and bacteria and algae growth in wate...

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Problems solved by technology

[0005] The technical problem to be solved in the present invention: the phosphate scale inhibitor can be combined with the higher content of Ca in water 2+ In addition, after the circulating cooling water added with phosphate scale inhibitors is discharged into natural waters, because of its relatively high phosphorus content, it is easy to cause eutrophic pollution to the environment, which does not conform to the national environmental protection policy Require

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