Industrial circulating water corrosion inhibitor and preparation method thereof

Abstract

The invention relates to the technical field of circulating water corrosion inhibition, in particular to an industrial circulating water corrosion inhibitor and a preparation method thereof.The industrial circulating water corrosion inhibitor is prepared from sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, amino trimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate and deionized water, and the industrial circulating water corrosion inhibitor is prepared from, by weight, sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, amino trimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate and deionized water. By compounding various corrosion inhibition components such as sodium hexametaphosphate, hydroxyethylidene diphosphonic acid and amino trimethylene phosphonic acid, the composite corrosion inhibitor with a synergistic corrosion inhibition effect is formed, excellent corrosion inhibition performance can be provided under various working conditions, and the corrosion inhibitor does not generate harmful byproducts in the use process, is environment-friendly, and is suitable for industrial production. The corrosion inhibitor has good compatibility with other water treatment agents and can be jointly used in a circulating water system, and the overall performance of the system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of circulating water corrosion inhibition, in particular to an industrial circulating water corrosion inhibitor and a preparation method thereof. Background Art

[0002] Industrial circulating water corrosion inhibitor is a chemical additive specially used in industrial circulating water systems. Its main function is to slow down or prevent the corrosion of circulating water on metal equipment. By adding corrosion inhibitor, the service life of metal equipment can be effectively extended, the operating efficiency of the system can be improved, and the maintenance cost and downtime caused by corrosion can be reduced.

[0003] However, in general, traditional industrial circulating water corrosion inhibitors often have the following problems: the corrosion inhibition effect is not ideal under specific conditions of high temperature, high hardness water, and the presence of specific ions; some corrosion inhibitors may contain ingredients that are harmful to the environment, and discharge after use may cause water pollution; they are not compatible with other bactericides, scale inhibitors and water treatment agents, which may lead to a decline in system performance.

[0004] Based on this, the present invention provides an industrial circulating water corrosion inhibitor and a preparation method thereof to solve the above-mentioned technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide an industrial circulating water corrosion inhibitor and a preparation method thereof. The prepared high-strength metal connector material not only has good mechanical properties, but also has excellent corrosion resistance, effectively ensuring its quality.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An industrial circulating water corrosion inhibitor comprises sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate and deionized water, and is composed of the following raw materials in parts by weight:

[0008] Sodium hexametaphosphate: 20-40 parts by weight;

[0009] Hydroxyethylidene diphosphonic acid: 5-15 parts by weight;

[0010] Aminotrimethylenephosphonic acid: 3-8 parts by weight;

[0011] Sodium gluconate: 10-20 parts by weight;

[0012] Sodium polyacrylate: 5-15 parts by weight;

[0013] Zinc sulfate: 1-5 parts by weight;

[0014] Benzotriazole: 0.5-2 parts by weight;

[0015] Polyaspartic acid: 5-15 parts by weight;

[0016] Sodium molybdate: 0.5-2 parts by weight;

[0017] Deionized water: 150-200 parts by weight

[0018] The sodium molybdate is prepared by reacting molybdic acid with sodium hydroxide or sodium carbonate, and has a purity of ≥98%. The deionized water is prepared by a reverse osmosis method.

[0019] Preferably, the sodium hexametaphosphate is obtained by dehydrating sodium dihydrogen phosphate, and then subjected to high temperature treatment at 600-650° C. and rapid cooling, and has a purity of ≥95%.

[0020] Preferably, the hydroxyethylidene diphosphonic acid is prepared by an organic synthesis method, has a purity of ≥50%, and a pH of 2-3.

[0021] Preferably, the aminotrimethylenephosphonic acid is prepared from formaldehyde, ethylenediamine and phosphorus trichloride as raw materials, with a purity of ≥50% and a pH of 9-10.

[0022] Preferably, the sodium gluconate is prepared by oxidizing glucose and then reacting it with an alkali for neutralization, and the purity is ≥95%.

[0023] Preferably, the sodium polyacrylate is prepared by copolymerization of acrylic acid and acrylamide, and has a purity of ≥90%.

[0024] Preferably, the zinc sulfate is prepared by reacting sulfuric acid with zinc metal or zinc oxide, and has a purity of ≥98%.

[0025] Preferably, the benzotriazole is prepared by diazotization and cyclization of o-phenylenediamine, and has a purity of ≥99%.

[0026] Preferably, the polyaspartic acid is prepared by polymerization of aspartic acid, and has a purity of ≥95%.

[0027] Based on the above industrial circulating water corrosion inhibitor, the present invention also proposes a method for preparing the industrial circulating water corrosion inhibitor, comprising the following steps:

[0028] S1. Formula weighing, using an electronic balance to accurately weigh the weight of each raw material, including 20 to 40 parts by weight of sodium hexametaphosphate, 5 to 15 parts by weight of hydroxyethylidene diphosphonic acid, 3 to 8 parts by weight of aminotrimethylene phosphonic acid, 10 to 20 parts by weight of sodium gluconate, 5 to 15 parts by weight of sodium polyacrylate, 1 to 5 parts by weight of zinc sulfate, 0.5 to 2 parts by weight of benzotriazole, 5 to 15 parts by weight of polyaspartic acid, 0.5 to 2 parts by weight of sodium molybdate, and 150 to 200 parts by weight of deionized water;

[0029] S2. The weighed solid raw materials are sequentially added to the mixing kettle, stirring while adding to ensure that the raw materials are evenly mixed, an appropriate amount of deionized water is added, and stirring is continued until the solid raw materials are completely dissolved, and the stirring speed and time of the mixing kettle are controlled to ensure that the solution is uniform and free of precipitation, the stirring speed is 50 to 200 rpm, and the stirring time is 30 to 60 minutes;

[0030] S3. Adjust the pH value of the solution according to the performance requirements of the corrosion inhibitor. Use a pH meter to monitor the pH value of the solution and add an appropriate amount of acid or alkali to adjust it. During the adjustment process, the acid or alkali should be added slowly to avoid partial over-acidity or over-alkali causing decomposition or precipitation of the raw materials. After adjusting to the target pH value, continue stirring for a period of time to ensure that the solution is stable;

[0031] S4. Filtration and purification, using a plate and frame filter for filtration;

[0032] S5. The filtered solution is transferred to a constant volume kettle, and the amount of deionized water added is accurately measured using a volumetric flask or a flow meter. After constant volume, the solution is stirred until uniform, and the constant volume solution is filled into a packaging container;

[0033] S6. Carry out quality inspection on the corrosion inhibitor after filling, including appearance, pH value, concentration, purity index, and use appropriate testing instruments and methods to ensure that the corrosion inhibitor meets the quality standards.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention forms a composite corrosion inhibitor with a synergistic corrosion inhibition effect by compounding multiple corrosion inhibition ingredients such as sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, and aminotrimethylene phosphonic acid. The composite corrosion inhibitor can provide excellent corrosion inhibition performance under various working conditions, and the corrosion inhibitor does not produce harmful by-products during use, and is environmentally friendly. The corrosion inhibitor has good compatibility with other water treatment agents and can be used together in a circulating water system to improve the overall performance of the system. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] An industrial circulating water corrosion inhibitor comprises sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate and deionized water, and is composed of the following raw materials in parts by weight:

[0038] Sodium hexametaphosphate: 20-40 parts by weight;

[0039] Hydroxyethylidene diphosphonic acid: 5-15 parts by weight;

[0040] Aminotrimethylenephosphonic acid: 3-8 parts by weight;

[0041] Sodium gluconate: 10-20 parts by weight;

[0042] Sodium polyacrylate: 5-15 parts by weight;

[0043] Zinc sulfate: 1-5 parts by weight;

[0044] Benzotriazole: 0.5-2 parts by weight;

[0045] Polyaspartic acid: 5-15 parts by weight;

[0046] Sodium molybdate: 0.5-2 parts by weight;

[0047] Deionized water: 150-200 parts by weight

[0048] Furthermore, sodium molybdate is prepared by reacting molybdic acid with sodium hydroxide or sodium carbonate, and has a purity of ≥98%. Furthermore, deionized water is prepared by a reverse osmosis method.

[0049] It should be noted that sodium hexametaphosphate is obtained by dehydrating sodium dihydrogen phosphate, then subjecting it to high temperature treatment at 600-650° C. and rapid cooling, and its purity is ≥95%.

[0050] It should be noted that hydroxyethylidene diphosphonic acid is prepared by an organic synthesis method, with a purity of ≥50% and a pH of 2-3.

[0051] It should be noted that aminotrimethylenephosphonic acid is prepared from formaldehyde, ethylenediamine and phosphorus trichloride as raw materials, with a purity of ≥50% and a pH of 9-10.

[0052] It should be noted that sodium gluconate is prepared by oxidizing glucose and then reacting it with an alkali, and its purity is ≥95%.

[0053] It should be noted that sodium polyacrylate is prepared by copolymerization of acrylic acid and acrylamide, and has a purity of ≥90%.

[0054] It should be noted that zinc sulfate is prepared by reacting sulfuric acid with zinc metal or zinc oxide, and has a purity of ≥98%.

[0055] It should be noted that benzotriazole is prepared by diazotization and cyclization of o-phenylenediamine, and has a purity of ≥99%.

[0056] It should be noted that polyaspartic acid is prepared by polymerization of aspartic acid, and has a purity of ≥95%.

[0057] Based on the above industrial circulating water corrosion inhibitor, the present invention also proposes a method for preparing the industrial circulating water corrosion inhibitor, comprising the following steps:

[0058] S1. Formula weighing, using an electronic balance to accurately weigh the weight of each raw material, including 20 to 40 parts by weight of sodium hexametaphosphate, 5 to 15 parts by weight of hydroxyethylidene diphosphonic acid, 3 to 8 parts by weight of aminotrimethylene phosphonic acid, 10 to 20 parts by weight of sodium gluconate, 5 to 15 parts by weight of sodium polyacrylate, 1 to 5 parts by weight of zinc sulfate, 0.5 to 2 parts by weight of benzotriazole, 5 to 15 parts by weight of polyaspartic acid, 0.5 to 2 parts by weight of sodium molybdate, and 150 to 200 parts by weight of deionized water;

[0059] S2. The weighed solid raw materials are sequentially added to the mixing kettle, stirring while adding to ensure that the raw materials are evenly mixed, an appropriate amount of deionized water is added, and stirring is continued until the solid raw materials are completely dissolved, and the stirring speed and time of the mixing kettle are controlled to ensure that the solution is uniform and free of precipitation, the stirring speed is 50 to 200 rpm, and the stirring time is 30 to 60 minutes;

[0060] S3. Adjust the pH value of the solution according to the performance requirements of the corrosion inhibitor. Use a pH meter to monitor the pH value of the solution and add an appropriate amount of acid or alkali to adjust it. During the adjustment process, the acid or alkali should be added slowly to avoid partial over-acidity or over-alkali causing decomposition or precipitation of the raw materials. After adjusting to the target pH value, continue stirring for a period of time to ensure that the solution is stable;

[0061] S4. Filtration and purification, using a plate and frame filter for filtration;

[0062] S5. The filtered solution is transferred to a constant volume kettle, and the amount of deionized water added is accurately measured using a volumetric flask or a flow meter. After constant volume, the solution is stirred until uniform, and the constant volume solution is filled into a packaging container;

[0063] S6. Carry out quality inspection on the corrosion inhibitor after filling, including appearance, pH value, concentration, purity index, and use appropriate testing instruments and methods to ensure that the corrosion inhibitor meets the quality standards.

[0064] Example 1

[0065] Based on the above industrial circulating water corrosion inhibitor, this embodiment proposes a method for preparing an industrial circulating water corrosion inhibitor, comprising the following steps:

[0066] S1. Formula weighing, using an electronic balance to accurately weigh the weight of each raw material, including sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water;

[0067] S2. The weighed solid raw materials were sequentially added to the mixing kettle, stirring while adding to ensure that the raw materials were evenly mixed, an appropriate amount of deionized water was added, and stirring was continued until the solid raw materials were completely dissolved, and the stirring speed and time of the mixing kettle were controlled to ensure that the solution was uniform and free of precipitation, the stirring speed was 100 rpm, and the stirring time was 45 minutes;

[0068] S3. Adjust the pH value of the solution according to the performance requirements of the corrosion inhibitor. Use a pH meter to monitor the pH value of the solution and add an appropriate amount of acid or alkali to adjust it. During the adjustment process, the acid or alkali should be added slowly to avoid partial over-acidity or over-alkali causing decomposition or precipitation of the raw materials. After adjusting to the target pH value, continue stirring for 25 minutes to ensure that the solution is stable;

[0069] S4. Filtration and purification, using a plate and frame filter for filtration;

[0070] S5. The filtered solution is transferred to a constant volume kettle, and the amount of deionized water added is accurately measured using a volumetric flask or a flow meter. After constant volume, the solution is stirred until uniform, and the constant volume solution is filled into a packaging container;

[0071] S6. Carry out quality inspection on the corrosion inhibitor after filling, including appearance, pH value, concentration, purity index, and use appropriate testing instruments and methods to ensure that the corrosion inhibitor meets the quality standards.

[0072] It should be noted that, in this embodiment, the weight parts of sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water are specifically as follows:

[0073] Sodium hexametaphosphate: 30 parts by weight;

[0074] Hydroxyethylidene diphosphonic acid: 10 parts by weight;

[0075] Aminotrimethylenephosphonic acid: 5 parts by weight;

[0076] Sodium gluconate: 15 parts by weight;

[0077] Sodium polyacrylate: 10 parts by weight;

[0078] Zinc sulfate: 3 parts by weight;

[0079] Benzotriazole: 1 part by weight;

[0080] Polyaspartic acid: 10 parts by weight;

[0081] Sodium molybdate: 1 part by weight;

[0082] Deionized water: 175 parts by weight.

[0083] Example 2

[0084] Based on the above industrial circulating water corrosion inhibitor, this embodiment proposes a method for preparing an industrial circulating water corrosion inhibitor, comprising the following steps:

[0085] S1. Formula weighing, using an electronic balance to accurately weigh the weight of each raw material, including sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water;

[0086] S2. The weighed solid raw materials were sequentially added to the mixing kettle, stirring while adding to ensure that the raw materials were evenly mixed, an appropriate amount of deionized water was added, and stirring was continued until the solid raw materials were completely dissolved, and the stirring speed and time of the mixing kettle were controlled to ensure that the solution was uniform and free of precipitation, the stirring speed was 100 rpm, and the stirring time was 45 minutes;

[0087] S3. Adjust the pH value of the solution according to the performance requirements of the corrosion inhibitor. Use a pH meter to monitor the pH value of the solution and add an appropriate amount of acid or alkali to adjust it. During the adjustment process, the acid or alkali should be added slowly to avoid partial over-acidity or over-alkali causing decomposition or precipitation of the raw materials. After adjusting to the target pH value, continue stirring for 25 minutes to ensure that the solution is stable;

[0088] S4. Filtration and purification, using a plate and frame filter for filtration;

[0089] S5. The filtered solution is transferred to a constant volume kettle, and the amount of deionized water added is accurately measured using a volumetric flask or a flow meter. After constant volume, the solution is stirred until uniform, and the constant volume solution is filled into a packaging container;

[0090] S6. Carry out quality inspection on the corrosion inhibitor after filling, including appearance, pH value, concentration, purity index, and use appropriate testing instruments and methods to ensure that the corrosion inhibitor meets the quality standards.

[0091] It should be noted that, in this embodiment, the weight parts of sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water are specifically as follows:

[0092] Sodium hexametaphosphate: 25 parts by weight;

[0093] Hydroxyethylidene diphosphonic acid: 15 parts by weight;

[0094] Aminotrimethylenephosphonic acid: 3 parts by weight;

[0095] Sodium gluconate: 20 parts by weight;

[0096] Sodium polyacrylate: 5 parts by weight;

[0097] Zinc sulfate: 1 part by weight;

[0098] Benzotriazole: 0.5 parts by weight;

[0099] Polyaspartic acid: 15 parts by weight;

[0100] Sodium molybdate: 0.5 parts by weight;

[0101] Deionized water: 200 parts by weight.

[0102] Example 3

[0103] Based on the above industrial circulating water corrosion inhibitor, this embodiment proposes a method for preparing an industrial circulating water corrosion inhibitor, comprising the following steps:

[0104] S1. Formula weighing, using an electronic balance to accurately weigh the weight of each raw material, including sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water;

[0105] S2. The weighed solid raw materials were sequentially added to the mixing kettle, stirring while adding to ensure that the raw materials were evenly mixed, an appropriate amount of deionized water was added, and stirring was continued until the solid raw materials were completely dissolved, and the stirring speed and time of the mixing kettle were controlled to ensure that the solution was uniform and free of precipitation, the stirring speed was 100 rpm, and the stirring time was 45 minutes;

[0106] S3. Adjust the pH value of the solution according to the performance requirements of the corrosion inhibitor. Use a pH meter to monitor the pH value of the solution and add an appropriate amount of acid or alkali to adjust it. During the adjustment process, the acid or alkali should be added slowly to avoid partial over-acidity or over-alkali causing decomposition or precipitation of the raw materials. After adjusting to the target pH value, continue stirring for 25 minutes to ensure that the solution is stable;

[0107] S4. Filtration and purification, using a plate and frame filter for filtration;

[0108] S5. The filtered solution is transferred to a constant volume kettle, and the amount of deionized water added is accurately measured using a volumetric flask or a flow meter. After constant volume, the solution is stirred until uniform, and the constant volume solution is filled into a packaging container;

[0109] S6. Carry out quality inspection on the corrosion inhibitor after filling, including appearance, pH value, concentration, purity index, and use appropriate testing instruments and methods to ensure that the corrosion inhibitor meets the quality standards.

[0110] It should be noted that, in this embodiment, the weight parts of sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water are specifically as follows:

[0111] Sodium hexametaphosphate: 40 parts by weight;

[0112] Hydroxyethylidene diphosphonic acid: 5 parts by weight;

[0113] Aminotrimethylenephosphonic acid: 8 parts by weight;

[0114] Sodium gluconate: 10 parts by weight;

[0115] Sodium polyacrylate: 15 parts by weight;

[0116] Zinc sulfate: 5 parts by weight;

[0117] Benzotriazole: 2 parts by weight;

[0118] Polyaspartic acid: 5 parts by weight;

[0119] Sodium molybdate: 2 parts by weight;

[0120] Deionized water: 150 parts by weight.

[0121] Example 4

[0122] Based on the above industrial circulating water corrosion inhibitor, this embodiment proposes a method for preparing an industrial circulating water corrosion inhibitor, comprising the following steps:

[0123] S1. Formula weighing, using an electronic balance to accurately weigh the weight of each raw material, including sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water;

[0124] S2. The weighed solid raw materials were sequentially added to the mixing kettle, stirring while adding to ensure that the raw materials were evenly mixed, an appropriate amount of deionized water was added, and stirring was continued until the solid raw materials were completely dissolved, and the stirring speed and time of the mixing kettle were controlled to ensure that the solution was uniform and free of precipitation, the stirring speed was 100 rpm, and the stirring time was 45 minutes;

[0125] S3. Adjust the pH value of the solution according to the performance requirements of the corrosion inhibitor. Use a pH meter to monitor the pH value of the solution and add an appropriate amount of acid or alkali to adjust it. During the adjustment process, the acid or alkali should be added slowly to avoid partial over-acidity or over-alkali causing decomposition or precipitation of the raw materials. After adjusting to the target pH value, continue stirring for 25 minutes to ensure that the solution is stable;

[0126] S4. Filtration and purification, using a plate and frame filter for filtration;

[0127] S5. The filtered solution is transferred to a constant volume kettle, and the amount of deionized water added is accurately measured using a volumetric flask or a flow meter. After constant volume, the solution is stirred until uniform, and the constant volume solution is filled into a packaging container;

[0128] S6. Carry out quality inspection on the corrosion inhibitor after filling, including appearance, pH value, concentration, purity index, and use appropriate testing instruments and methods to ensure that the corrosion inhibitor meets the quality standards.

[0129] It should be noted that, in this embodiment, the weight parts of sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water are specifically as follows:

[0130] Sodium hexametaphosphate: 20 parts by weight;

[0131] Hydroxyethylidene diphosphonic acid: 12 parts by weight;

[0132] Aminotrimethylenephosphonic acid: 6 parts by weight;

[0133] Sodium gluconate: 18 parts by weight;

[0134] Sodium polyacrylate: 8 parts by weight;

[0135] Zinc sulfate: 2 parts by weight;

[0136] Benzotriazole: 1.5 parts by weight;

[0137] Polyaspartic acid: 8 parts by weight;

[0138] Sodium molybdate: 1.5 parts by weight;

[0139] Deionized water: 180 parts by weight.

[0140] Example 5

[0141] Based on the above industrial circulating water corrosion inhibitor, this embodiment proposes a method for preparing an industrial circulating water corrosion inhibitor, comprising the following steps:

[0142] S1. Formula weighing, using an electronic balance to accurately weigh the weight of each raw material, including sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water;

[0143] S2. The weighed solid raw materials were sequentially added to the mixing kettle, stirring while adding to ensure that the raw materials were evenly mixed, an appropriate amount of deionized water was added, and stirring was continued until the solid raw materials were completely dissolved, and the stirring speed and time of the mixing kettle were controlled to ensure that the solution was uniform and free of precipitation, the stirring speed was 100 rpm, and the stirring time was 45 minutes;

[0144] S3. Adjust the pH value of the solution according to the performance requirements of the corrosion inhibitor. Use a pH meter to monitor the pH value of the solution and add an appropriate amount of acid or alkali to adjust it. During the adjustment process, the acid or alkali should be added slowly to avoid partial over-acidity or over-alkali causing decomposition or precipitation of the raw materials. After adjusting to the target pH value, continue stirring for 25 minutes to ensure that the solution is stable;

[0145] S4. Filtration and purification, using a plate and frame filter for filtration;

[0146] S5. The filtered solution is transferred to a constant volume kettle, and the amount of deionized water added is accurately measured using a volumetric flask or a flow meter. After constant volume, the solution is stirred until uniform, and the constant volume solution is filled into a packaging container;

[0147] S6. Carry out quality inspection on the corrosion inhibitor after filling, including appearance, pH value, concentration, purity index, and use appropriate testing instruments and methods to ensure that the corrosion inhibitor meets the quality standards.

[0148] It should be noted that, in this embodiment, the weight parts of sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate, and deionized water are specifically as follows:

[0149] Sodium hexametaphosphate: 35 parts by weight;

[0150] Hydroxyethylidene diphosphonic acid: 7 parts by weight;

[0151] Aminotrimethylenephosphonic acid: 4 parts by weight;

[0152] Sodium gluconate: 12 parts by weight;

[0153] Sodium polyacrylate: 12 parts by weight;

[0154] Zinc sulfate: 4 parts by weight;

[0155] Benzotriazole: 1 part by weight;

[0156] Polyaspartic acid: 12 parts by weight;

[0157] Sodium molybdate: 1 part by weight;

[0158] Deionized water: 160 parts by weight.

[0159] Comparative Example 1: The difference from Example 1 is that: the sodium hexametaphosphate is reduced, specifically, the sodium hexametaphosphate is 20 parts by weight, and the other raw materials are the same as Example 1.

[0160] Comparative Example 2: The difference from Example 1 is that: hydroxyethylidene diphosphonic acid is increased, specifically, hydroxyethylidene diphosphonic acid is 20 parts by weight, and other raw materials are the same as Example 1.

[0161] Comparative Example 3: The difference from Example 1 is that aminotrimethylenephosphonic acid is reduced. Specifically, aminotrimethylenephosphonic acid is 2 parts by weight, and other raw materials are the same as Example 1.

[0162] Comparative Example 4: The difference from Example 1 is that sodium gluconate is increased, specifically, 25 parts by weight of sodium gluconate, and other raw materials are the same as those in Example 1.

[0163] Comparative Example 5: The difference from Example 1 is that the amount of deionized water is reduced. Specifically, the amount of deionized water is 100 parts by weight, and the other raw materials are the same as those in Example 1.

[0164] Performance Test:

[0165] Samples were prepared from the components in Examples 1 to 5 and Comparative Examples 1 to 5, and the appearance, pH value, concentration, and purity index were tested. First, the color, transparency, and presence of impurities of the samples were observed, and the pH value of the samples was measured using a pH meter. Then, the concentration of the main active ingredient in the sample was determined by a chemical analysis method or instrument, and finally, the purity of the sample was determined by a high performance liquid chromatography method. The specific parameters are shown in Table 1 (unit: weight parts):

[0166] Table 1 Component parameters of Examples 1 to 5 and Comparative Examples 1 to 5

[0167]

[0168]

[0169]

[0170] The experimental record data is shown in Table 2:

[0171] Table 2 Test data of samples of Examples 1 to 5 and Comparative Examples 1 to 5

[0172]

[0173]

[0174] By analyzing the test data of the samples of Examples 1 to 5 and Comparative Examples 1 to 5, it can be seen that the sample of Example 1 is a colorless transparent liquid without impurities, has the best appearance quality, and has a pH value of 7.0, which is in the neutral range, is friendly to the equipment and the use environment, and the concentration is within the expected range, ensuring the effectiveness and stability of the product. At the same time, the purity of the sample prepared in Example 1 is as high as 99.5%, which is the highest purity among all samples, ensuring the quality and performance of the product. Therefore, on the premise that all samples are qualified, Example 1 is the preferred embodiment of the present invention.

[0175] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0176] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An industrial circulating water corrosion inhibitor, characterized in that: It comprises sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, sodium gluconate, sodium polyacrylate, zinc sulfate, benzotriazole, polyaspartic acid, sodium molybdate and deionized water, and is composed of the following raw materials in parts by weight: Sodium hexametaphosphate: 20-40 parts by weight; Hydroxyethylidene diphosphonic acid: 5-15 parts by weight; Aminotrimethylenephosphonic acid: 3-8 parts by weight; Sodium gluconate: 10-20 parts by weight; Sodium polyacrylate: 5-15 parts by weight; Zinc sulfate: 1-5 parts by weight; Benzotriazole: 0.5-2 parts by weight; Polyaspartic acid: 5-15 parts by weight; Sodium molybdate: 0.5-2 parts by weight; Deionized water: 150-200 parts by weight The sodium molybdate is prepared by reacting molybdic acid with sodium hydroxide or sodium carbonate, and has a purity of ≥98%. The deionized water is prepared by a reverse osmosis method.

2. An industrial circulating water corrosion inhibitor according to claim 1, characterized in that: The sodium hexametaphosphate is prepared by dehydrating sodium dihydrogen phosphate, and then subjected to high-temperature treatment at 600-650° C. and rapid cooling, with a purity of ≥95%.

3. An industrial circulating water corrosion inhibitor according to claim 1, characterized in that: The hydroxyethylidene diphosphonic acid is prepared by an organic synthesis method, with a purity of ≥50% and a pH of 2-3.

4. An industrial circulating water corrosion inhibitor according to claim 1, characterized in that: The aminotrimethylenephosphonic acid is prepared from formaldehyde, ethylenediamine and phosphorus trichloride as raw materials, with a purity of ≥50% and a pH of 9-10.

5. The industrial circulating water corrosion inhibitor according to claim 1, characterized in that: The sodium gluconate is prepared by oxidizing glucose and then reacting it with alkali for neutralization, and the purity is ≥95%.

6. An industrial circulating water corrosion inhibitor according to claim 1, characterized in that: The sodium polyacrylate is prepared by copolymerization of acrylic acid and acrylamide, and has a purity of ≥90%.

7. The industrial circulating water corrosion inhibitor according to claim 1, characterized in that: The zinc sulfate is prepared by reacting sulfuric acid with zinc metal or zinc oxide, and has a purity of ≥98%.

8. The industrial circulating water corrosion inhibitor according to claim 1, characterized in that: The benzotriazole is prepared by diazotization and cyclization of o-phenylenediamine, and has a purity of ≥99%.

9. The industrial circulating water corrosion inhibitor according to claim 1, characterized in that: The polyaspartic acid is prepared by polymerization of aspartic acid, and has a purity of ≥95%.

10. A method for preparing an industrial circulating water corrosion inhibitor, according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Formula weighing, using an electronic balance to accurately weigh the weight of each raw material, including 20 to 40 parts by weight of sodium hexametaphosphate, 5 to 15 parts by weight of hydroxyethylidene diphosphonic acid, 3 to 8 parts by weight of aminotrimethylene phosphonic acid, 10 to 20 parts by weight of sodium gluconate, 5 to 15 parts by weight of sodium polyacrylate, 1 to 5 parts by weight of zinc sulfate, 0.5 to 2 parts by weight of benzotriazole, 5 to 15 parts by weight of polyaspartic acid, 0.5 to 2 parts by weight of sodium molybdate, and 150 to 200 parts by weight of deionized water; S2. The weighed solid raw materials are sequentially added to the mixing kettle, stirring while adding to ensure that the raw materials are evenly mixed, an appropriate amount of deionized water is added, and stirring is continued until the solid raw materials are completely dissolved, and the stirring speed and time of the mixing kettle are controlled to ensure that the solution is uniform and free of precipitation, the stirring speed is 50 to 200 rpm, and the stirring time is 30 to 60 minutes; S3. Adjust the pH value of the solution according to the performance requirements of the corrosion inhibitor. Use a pH meter to monitor the pH value of the solution and add an appropriate amount of acid or alkali to adjust it. During the adjustment process, the acid or alkali should be added slowly to avoid partial over-acidity or over-alkali causing decomposition or precipitation of the raw materials. After adjusting to the target pH value, continue stirring for a period of time to ensure that the solution is stable; S4. Filtration and purification, using a plate and frame filter for filtration; S5. The filtered solution is transferred to a constant volume kettle, and the amount of deionized water added is accurately measured using a volumetric flask or a flow meter. After constant volume, the solution is stirred until uniform, and the constant volume solution is filled into a packaging container; S6. Carry out quality inspection on the corrosion inhibitor after filling, including appearance, pH value, concentration, purity index, and use appropriate testing instruments and methods to ensure that the corrosion inhibitor meets the quality standards.

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