阅读说明：本技术 一种不含磷循环水缓蚀剂 (Circulating water corrosion inhibitor without phosphorus ) 是由 尹明静 许谦 于 2019-09-19 设计创作，主要内容包括：本发明公开了一种不含磷循环水缓蚀剂,属于阻垢缓蚀剂领域。本发明按照质量分数计,由以下组分组成：腐植酸钠8~30%、丙烯酸-2-丙烯酰胺-2-甲基丙基磺酸共聚物1~8%、N,N-二甲基-3-脂肪酰胺基丙胺0.5~8%、苯骈三氮唑0.5~5%、水溶性季铵盐0.1~4%、无机锌盐2~10%、余量水。本发明不含磷循环水缓蚀剂,配方组分的稳定性、减阻缓蚀以及环保安全已得到验证,容易推广。本发明不含磷循环水缓蚀剂兼有阻垢、缓蚀和节能的效果,且阻垢、缓蚀效果远超国家标准和行业标准,适用于工业装置中的循环水处理系统。(The invention discloses a phosphorus-free circulating water corrosion inhibitor, which belongs to the field of scale and corrosion inhibitors and comprises, by mass, 8 ~ 30% of sodium humate, 1 ~ 8% of acrylic acid-2-acrylamide-2-methylpropyl sulfonic acid copolymer, 0.5 ~ 8% of N, N-dimethyl-3-fatty amido propylamine, 0.5 ~ 5% of benzotriazole, 0.1 ~ 4% of water-soluble quaternary ammonium salt, 2 ~ 10% of inorganic zinc salt and the balance of water.)

1. The phosphorus-free circulating water corrosion inhibitor is characterized by comprising the following components in percentage by mass:

sodium humate 8 ~ 30%

Acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer 1 ~ 8%

N, N-dimethyl-3-fatty amidopropylamine 0.5 ~ 8%

Benzotriazole 0.5 ~ 5%

Water-soluble quaternary ammonium salt 0.1 ~ 4%

Inorganic zinc salt 2 ~ 10%

The balance of water.

2. The phosphorus-free circulating water corrosion inhibitor as claimed in claim 1, wherein: the water-soluble quaternary ammonium salt is carboxymethyl chitosan quaternary ammonium salt.

3. The phosphorus-free circulating water corrosion inhibitor as claimed in claim 1 or 2, wherein: the inorganic zinc salt is one or more of zinc nitrate, zinc sulfate and zinc chloride.

4. The phosphorus-free circulating water corrosion inhibitor as claimed in claim 1 or 2, which comprises the following components in percentage by mass:

sodium humate 10 ~ 20%

Acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer 2 ~ 6%

N, N-dimethyl-3-fatty amidopropylamine 1 ~ 5%

Benzotriazole 1 ~ 3%

Water-soluble quaternary ammonium salt 0.5 ~ 2%

Inorganic zinc salt 4 ~ 7%

The balance of water.

5. The phosphorus-free circulating water corrosion inhibitor as claimed in claim 4, which comprises the following components in percentage by mass:

sodium humate 16%

Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 4%

N, N-dimethyl-3-fatty amidopropylamine 3%

2 percent of benzotriazole

1 percent of water-soluble quaternary ammonium salt

Inorganic zinc salt 6%

The balance of water.

6. The preparation method of the phosphorus-free circulating water corrosion inhibitor as claimed in claim 1, wherein the phosphorus-free circulating water slow release agent is prepared by adding water into a container, adjusting the pH value of the solution to 9 ~ 11 with an alkali solution, respectively adding sodium humate, acrylic acid-2-acrylamide-2-methylpropyl sulfonic acid copolymer, N-dimethyl-3-fatty amido propylamine, benzotriazole, water-soluble quaternary ammonium salt and inorganic zinc salt, and stirring for dissolution.

7. The method for preparing the phosphorus-free circulating water corrosion inhibitor as claimed in claim 6, wherein water is added into the container, and the pH value of the solution is adjusted to 9 ~ 10 by using alkali liquor.

Technical Field

The invention relates to the field of scale and corrosion inhibitors, relates to a fine chemical additive with a drag reduction function and corrosion resistance to industrial equipment in a cooling treatment process, and particularly relates to a phosphorus-free circulating water corrosion inhibitor.

Background

During the operation of industrial circulating water treatment, various heat exchangers, pumps, pipelines and other metal equipment exist, and oxidation substances such as colloids, suspended matters, dissolved salts, dissolved gases and the like contained in water can corrode and scale the equipment. The energy-saving and emission-reducing task is heavy, and meanwhile, the safety production is threatened, so that the energy-saving and emission-reducing task is generally concerned in recent years.

The corrosion inhibitor can obtain good corrosion and scaling prevention effects without changing the corrosion environment, and is a preferred effective method for corrosion control. When a single medicament is used, the corrosion inhibition effect is not ideal enough, and at present, two main corrosion inhibitors, namely zinc salt and polyphosphate, are not stable enough in cooling water. Zinc salt is easy to precipitate at high pH value, so that the corrosion inhibition capability is lost; and the polyphosphate is easy to hydrolyze to generate calcium phosphate scale and is ineffective. Therefore, it is necessary to develop a composite corrosion inhibitor. The organic polyphosphate and the organic polycarboxylate have strong synergistic effect, so that the organic polyphosphate and the organic polycarboxylate have good compounding effect during industrial water treatment. However, these agents are expensive and have not been widely used.

Sodium humate is a complex mixture of polymeric carboxylates, has no fixed molecular structure and molecular weight, and is soluble in water. It is rich in carboxyl, hydroxyl and other organic groups, has ion exchange, adsorption, complexation and other properties and good dispersivity, and can effectively disperse metal oxide, thus showing good corrosion inhibition performance, and the functions are similar to the functions of organic polycarboxylate, and the price is low. So sodium humate is selected to replace organic polycarboxylate to be compounded with other water treatment agents.

The invention discloses a multifunctional circulating water sustained-release agent, which is a Chinese invention patent with the application publication number of CN104775124A, and the multifunctional circulating water sustained-release agent mainly comprises sodium humate, HEDP and T-225, and can also comprise zinc sulfate, BTA or TTA. The invention patents are the research results of 2014 in this subject group, and although the effects of scale inhibition, corrosion inhibition and energy saving are achieved, the effects still need to be further improved.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides the circulating water corrosion inhibitor which has the functions of corrosion inhibition, scale inhibition and energy conservation and is low in cost and free of phosphorus. The phosphorus-free circulating water corrosion inhibitor is particularly suitable for corrosion of industrial circulating cooling water on pipeline equipment.

The technical scheme of the invention is as follows:

a phosphorus-free circulating water corrosion inhibitor comprises the following components in parts by mass:

sodium humate 8 ~ 30%

Acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer 1 ~ 8%

N, N-dimethyl-3-fatty amidopropylamine 0.5 ~ 8%

Benzotriazole 0.5 ~ 5%

Water-soluble quaternary ammonium salt 0.1 ~ 4%

Inorganic zinc salt 2 ~ 10%

The balance of water.

The circulating water corrosion inhibitor without phosphorus is a composite auxiliary agent, the formula of the auxiliary agent is creatively screened out through corrosion inhibition and scale inhibition experiments, and the optimal concentration range is determined through orthogonal experiments.

In the present invention,

the sodium humate is used for exchanging, adsorbing and complexing metal ions, has good dispersibility, and can disperse metal oxides to be used as a scale and corrosion inhibitor and a dispersing agent;

acrylic acid-2-acrylamide-2-methylpropyl sulfonic acid copolymer as a scale inhibition and dispersion agent;

the N, N-dimethyl-3-fatty amido propylamine is used as a dispersant, so that the dispersing effect of the sustained release agent is obviously improved;

benzotriazole, and scale inhibition;

water-soluble quaternary ammonium salt for inhibiting scale;

inorganic zinc salt, scale inhibition.

The scale inhibition effect of a single scale inhibitor is poor due to instability, and the scale inhibition effect is obviously improved by compounding the slow release agent.

Preferably, the water-soluble quaternary ammonium salt is carboxymethyl chitosan quaternary ammonium salt.

Preferably, the inorganic zinc salt is one or more of zinc nitrate, zinc sulfate and zinc chloride.

Preferably, the circulating water corrosion inhibitor without phosphorus comprises the following components in percentage by mass:

sodium humate 10 ~ 20%

Acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer 2 ~ 6%

N, N-dimethyl-3-fatty amidopropylamine 1 ~ 5%

Benzotriazole 1 ~ 3%

Water-soluble quaternary ammonium salt 0.5 ~ 2%

Inorganic zinc salt 4 ~ 7%

The balance of water.

Further, the phosphorus-free circulating water corrosion inhibitor comprises the following components in percentage by mass:

sodium humate 16%

Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 4%

N, N-dimethyl-3-fatty amidopropylamine 3%

2 percent of benzotriazole

1 percent of water-soluble quaternary ammonium salt

Inorganic zinc salt 6%

The balance of water.

The preparation method of the circulating water corrosion inhibitor without phosphorus comprises the steps of adding water into a container, adjusting the pH value of the solution to 9 ~ 11 by using an alkali liquor, respectively adding sodium humate, an acrylic acid-2-acrylamide-2-methylpropyl sulfonic acid copolymer, N-dimethyl-3-fatty amido propylamine, benzotriazole, a water-soluble quaternary ammonium salt and an inorganic zinc salt, and stirring and dissolving to obtain the circulating water slow release agent without phosphorus.

Preferably, water is added to the container and the pH of the solution is adjusted to 9 ~ 10 with an alkaline solution.

The invention has the beneficial effects that:

1) the invention does not contain a phosphorus circulating water corrosion inhibitor, and the stability, resistance reduction, corrosion inhibition, environmental protection and safety of the components of the formula are verified, so the invention is easy to popularize.

2) The circulating water corrosion inhibitor without phosphorus has the effects of scale inhibition, corrosion inhibition and energy conservation, has the scale inhibition and corrosion inhibition effects far exceeding the national standard and the industrial standard, and is suitable for a circulating water treatment system in an industrial device.

3) The invention does not contain phosphorus circulating water corrosion inhibitor, and has convenient preparation and lower cost.

Detailed Description