Phosphorus-free composite corrosion and scale inhibitor

Abstract

The invention provides a phosphorus-free composite corrosion and scale inhibitor, which comprises active components, auxiliary agents and water. The active components include polyacrylic acid, polyepoxysuccinic acid, maleic acid-acrylic copolymer, polyaspartic acid, benzotriazole and inorganic sodium salt. The auxiliary agents include alkanolamide, long-chain fatty amine and micromolecular alcohols. The phosphorus-free composite corrosion and scale inhibitor is excellent in corrosion and scale inhibition effect and high in market competitiveness; by adding of alkanolamide and long-chain fattyamine, dirt particle dispersion performance can be improved, and corrosion and scale inhibition and rust prevention performances can be improved; by adding of the micromolecular alcohols, dissolvability of alkanolamide and long-chain fatty amine can be effectively improved, long-term stable storage is promoted, synergistic effects of components can be promoted, and the corrosion and scale inhibition performances are further improved; due to freeness of any inorganic phosphorus and organic phosphorus compounds, excellent safety and environmental friendliness and a promising practical application prospect are realized.

Description

technical field [0001] The invention relates to the technical field of preparation of corrosion and scale inhibitors for water treatment, in particular to a phosphorus-free composite corrosion and scale inhibitor. Background technique [0002] With the rapid development of industry, the shortage of water resources and water pollution have posed a serious threat to the sustainable development of society, especially the discharge of circulating cooling water in industries such as petrochemical, electric power, and metallurgy has caused direct pollution and damage to the environment. destroy. The circulating cooling water is affected by factors such as water evaporation, pH change, temperature rise, and impurities in the water during the circulation process, and with continuous circulation and concentration, the Ca in the circulating cooling water will 2+ , Mg 2+ , Fe 2+ , Fe 3+ The continuous accumulation of such cations increases, and then the CO in the circulating coolin...

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Problems solved by technology

[0004] The research on phosphorus-free slow-release scale inhibitors at home and abroad is mainly limited to carboxylic acids including polyacrylic acid and polyepoxysuccinic acid, polymaleic anhydride, silicon-based, molybdenum-based, tungsten-based, sodium benzoate, etc. slow-release scale inhibitor, and because some products contain non-ferrous metals such as molybdenum and tungsten, they will seriously pollute the water quality after being discharged into the water body. In addition, there is a certain threshold effect between some components in the compound corrosion and scale inhibitor. As a result, its corrosion and scale inhibition effects in practical applications are not good, which hinders its promotion and application

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