Phosphorus-free corrosion and scale inhibitor with sterilizing effect and preparation method and application thereof

Abstract

The invention discloses a combination used for corrosion and scale inhibitors. The combination is composed of imidazoline or modified imidazoline amide, olefin copolymer containing sulfonic acid groups, homopolymer containing carboxylic acid, ethyl acrylate / 2-acrylamide-2-methyl propane sulfonic acid copolymer, soluble metal salt and imidazole matter, wherein the weight ratio of the imidazoline or modified imidazoline amide, to the olefin copolymer containing sulfonic acid groups, to the homopolymer containing carboxylic acid, to the ethyl acrylate / 2-acrylamide-2-methyl propane sulfonic acid copolymer, to the soluble metal salt and to the imidazole matter is 1 to 0. 2-15 to 0. 04-10 to 0. 2-5 to 0. 1-15 to 0. 1-5 and is preferred to be 1 to 0. 5-7.5 to 0.2-5.0 to 0.3-4 to 1-7.5 to 0.1-3. The combination used for corrosion and scale inhibitors is free of phosphorus and nitrogen and friendly to the environment.

Description

technical field [0001] The invention relates to the field of water scale inhibitors, in particular to a non-phosphorus corrosion and scale inhibitor with bactericidal effect and its preparation method and application. Background technique [0002] Water is the basic condition for human survival, but water resources in the world are limited. my country's per capita water volume is only a quarter of the world's per capita water volume, and water resources are even poorer. With the rapid development of industry, the ecological balance of water has been seriously damaged day by day. In order to solve the water resource crisis and adapt to sustainable development, it is necessary to save water reasonably. The amount of cooling water in industrial water accounts for 60-80% by weight of the total water consumption. Therefore, the main goal of saving industrial water is to recycle cooling water, improve the reuse rate as much as possible, and reduce sewage discharge. However, dur...

AI Technical Summary

Problems solved by technology

However, during the use of cooling water, with the continuous circulation and concentration, the content of minerals in the water will continue to increase, which will aggravate the corrosion and scaling of pipes and equipment; in addition, many power plants now use reclaimed water as circulating cooling water Supplementary water, this kind of water has high content of inorganic salts and organic matter, which is easy for bacteria and algae to multiply, so it is necessary to add fungicides and corrosion and scale inhibitors to the cooling water to improve the quality of the cooling water, so as to ensure the safe operation of the equipment, but these chemicals will Increase the phosphorus content in circulating water, resulting in limited discharge. If it is placed in the environment, it will aggravate environmental pollution. At the same time, the addition of two chemicals will increase the cost of use

[0003] At present, domestic scientific research institutes and water treatment manufacturers have conducted research on phosphorus-free or low-phosphorus water treatment agents, but only limited to research on compounding and synergizing molybdenum, silicon, tungsten, sodium benzoate, sodium gluconate, and zinc salts

Moreover, some of the currently used phosphorus-free products contain high content of molybdenum and tungsten. As we all know, molybdenum and tungsten are non-renewable mineral resources, which belong to the state-controlled minerals, and the price is high. After discharge, they cannot be biodegraded and seriously pollute the water body.

[0004] CN1609020A discloses a method of treating corrosion and scale inhibiting water containing polyepoxysuccinic acid, which is to use polyepoxysuccinic acid alone or polyepoxysuccinic acid in conjunction with gluconic acid or gluconate and zinc salt (Zn2+) corrosion and scale inhibition method, but polyepoxysuccinic acid basically has no dispersion function and corrosion inhibition function, and it is easy to cause the deposition of zinc salt, resulting in low corrosion inhibition performance; CN101591073A discloses a non-phosphorus corrosion and scale inhibitor, The non-phosphorus corrosion and scale inhibitor contains lignin and tannin mixture 12-16%, water 55-65%, NaOH 0.7-0.8%, H 2 SO 4 1.7-2.2%, triethanolamine 12-16%, maleic anhydride 4-6%, borax 3-5%; CN101591074A discloses a phosphorus-free water treatment agent with excellent scale inhibition performance and effective control of microorganisms and slime hazards. In the phosphorus-free water treatment agent, the phosphorus-free corrosion and scale inhibitor is 15-25%, the three-component (AMPS) is 8-12%, the zinc chloride is 6-10%, polyma 6-10%, and room temperature water is 40%. -65%

[0005] However, the scale and corrosion inhibition products disclosed above have a high use concentration, a large amount of compounding, are not easy to compound, are difficult to detect and operate, have a narrow adaptability to water quality, have poor scale and corrosion inhibition effects, and have no bactericidal effect on water quality.