Corrosion and scale inhibitor as well as preparation method and application thereof

Abstract

The invention relates to the technical field of industrial water treatment chemical agents, in particular to a corrosion and scale inhibitor and a preparation method and application thereof. The corrosion and scale inhibitor provided by the invention comprises an agent A and an agent B, the agent A is prepared from the following raw materials: 10 to 18 parts of polyepoxysuccinic acid (sodium), 20 to 25 parts of polyacrylic acid (sodium), 10 to 15 parts of zinc salt, 5 to 8 parts of chromate, 7 to 11 parts of imidazoline compound and the balance of water; the agent B is prepared from the following raw materials in parts by weight: 20 to 25 parts of polyaspartic acid, 16 to 20 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 10 to 15 parts of acrylic acid-hydrolytic polymaleic anhydride copolymer, 5 to 10 parts of benzotriazole and the balance of water. The corrosion and scale inhibitor provided by the invention can realize efficient corrosion and scale inhibition effects aiming at cooling circulating water in different industries through accurate addition, effectively reduces the corrosion and scaling risks of equipment, remarkably prolongs the service life of the equipment, and greatly improves the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial water treatment chemicals, in particular to a corrosion and scale inhibitor and a preparation method and application thereof. Background Art

[0002] Cooling circulating water systems are essential infrastructure in industries such as chemical, papermaking, fermentation, and corn processing. However, as circulating water continues to evaporate and concentrate, the concentration of various ions in the water rises dramatically, making the circulating water system extremely susceptible to corrosion and scaling problems.

[0003] Corrosion not only significantly shortens equipment lifespan and significantly increases maintenance and replacement costs, but in severe cases can even cause safety incidents, posing a significant threat to production activities. Scaling, on the other hand, severely reduces equipment's heat transfer efficiency, leading to a sharp increase in energy consumption and a significant decrease in production efficiency. Currently, commercially available corrosion and scale inhibitors are generally insufficiently targeted, making it difficult to adapt to the significant differences in water quality and operating conditions found in cooling water systems across different industries. Some corrosion and scale inhibitors are only able to achieve either corrosion or scale inhibition, failing to effectively address both corrosion and scaling simultaneously.

[0004] Therefore, developing a corrosion and scale inhibitor that can be accurately dosed according to the characteristics of cooling circulating water systems in different industries and has excellent corrosion and scale inhibition performance has extremely important practical significance and broad market prospects. Summary of the Invention

[0005] In view of this, the present invention aims to provide a corrosion and scale inhibitor and its application. The corrosion and scale inhibitor provided by the present invention can achieve high corrosion and scale inhibition effects for cooling circulating water in different industries, effectively reducing the risk of corrosion and scaling of equipment, significantly extending the service life of equipment, and greatly improving production efficiency.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a corrosion and scale inhibitor, comprising agent A and agent B;

[0008] The raw materials for preparing the agent A include, based on 100 parts by total mass, 10-18 parts of polyepoxysuccinic acid and / or sodium polyepoxysuccinate, 20-25 parts of polyacrylic acid and / or sodium polyacrylate, 10-15 parts of zinc salt, 5-8 parts of chromate, 7-11 parts of imidazoline compound, and the balance of water;

[0009] The total mass is 100 parts. The raw materials for preparing the B agent include: 20-25 parts of polyaspartic acid, 16-20 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 10-15 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 5-10 parts of benzotriazole and the balance of water.

[0010] Preferably, the zinc salt comprises zinc chloride and / or zinc nitrate.

[0011] Preferably, the chromate includes one or more of sodium chromate, potassium chromate, sodium dichromate and potassium dichromate.

[0012] Preferably, the imidazoline compound includes cycloalkyl imidazoline and / or sulfur-containing imidazoline.

[0013] Preferably, the cycloalkyl imidazoline includes cyclohexyl imidazoline and / or cyclopentyl imidazoline, and the sulfur-containing imidazoline includes one or more of 2-thiol imidazoline, thioether imidazoline and sulfone imidazoline.

[0014] Preferably, the corrosion and scale inhibitor does not contain phosphorus.

[0015] The present invention provides a method for preparing the corrosion and scale inhibitor described in the above scheme, comprising the following steps:

[0016] Mix the raw materials for preparing Agent A and react at 45-55°C for 1.5-2.5 hours to obtain Agent A;

[0017] Mix the raw materials for preparing Agent B and react at 65-70°C for 1.5-2.5h to obtain Agent B.

[0018] The present invention provides the use of the corrosion and scale inhibitor described in the above scheme or the corrosion and scale inhibitor prepared by the preparation method described in the above scheme in preventing corrosion and scaling in a cooling circulating water system.

[0019] Preferably, the cooling circulating water system includes a cooling circulating water system of the chemical, papermaking, fermentation or corn deep processing industry.

[0020] Preferably, when the cooling circulating water system is a chemical cooling circulating water system, the mass ratio of agent A to agent B is 1:(1-1.8), and the total dosage of agent A and agent B is 150-250 mg / liter of cooling circulating water;

[0021] When the cooling circulating water system is a cooling circulating water system for the papermaking industry, the mass ratio of the agent A to the agent B is 1:(2-3.5), and the total dosage of the agent A and the agent B is 100-200 mg / liter of cooling circulating water;

[0022] When the cooling circulating water system is a cooling circulating water system for the fermentation and corn deep processing industries, the mass ratio of agent A to agent B is 1:(3-5), and the total dosage of agent A and agent B is 40-100 mg / liter of cooling circulating water.

[0023] The present invention provides a corrosion and scale inhibitor, which has excellent corrosion and scale inhibition effects, as shown in the following aspects:

[0024] Strong corrosion inhibition: The zinc salts, chromates, and imidazoline compounds in Agent A, along with the benzotriazole in Agent B, form precipitation films, passivation films, and adsorption films on metal surfaces, inhibiting corrosion. The corrosion inhibition efficiency exceeds 90%, and for copper alloys, it exceeds 95%.

[0025] Excellent scale inhibition: Poly(sodium) epoxysuccinate, poly(sodium) acrylic acid, polyaspartic acid, acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, and acrylic acid-hydrolyzed polymaleic anhydride copolymer prevent scale formation through chelation, dispersion, and lattice distortion. Polyaspartic acid has a 100% scale inhibition rate against calcium carbonate scale, acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer has a 100% scale inhibition rate against calcium sulfate scale, and acrylic acid-hydrolyzed polymaleic anhydride copolymer has a scale inhibition rate exceeding 90% against mixed scale (primarily calcium scale (such as calcium carbonate, calcium phosphate, calcium sulfate, etc.) and magnesium scale (such as magnesium silicate, etc.).

[0026] Furthermore, the corrosion and scale inhibitor provided by this invention is environmentally friendly: the polyaspartic acid in the formula is highly biodegradable and decomposes in the natural environment, reducing potential harm to the ecological environment and aligning with the concept of green development. Furthermore, by strictly controlling the amount of chromate used, its negative environmental impact is minimized.

[0027] Furthermore, the corrosion and scale inhibitor provided by the present invention does not contain phosphorus, and can prevent phosphorus from polluting the environment.

[0028] The corrosion and scale inhibitor provided by the present invention can bring significant economic benefits to corporate customers:

[0029] Reduce equipment maintenance costs: Excellent corrosion and scale inhibition effects significantly reduce equipment corrosion and scaling, reduce equipment maintenance and replacement frequency, and reduce the company's investment in manpower, material and financial resources for equipment maintenance.

[0030] Improve production efficiency: Stable water quality ensures efficient operation of equipment. In the fermentation and corn deep processing industries, it can reduce the interference of water quality problems on the production process and improve product quality and output.

[0031] The present invention provides a method for preparing the corrosion and scale inhibitor described in the above scheme. Agent A and Agent B are prepared under specific temperature and reaction time, have stable chemical structures, and are not easily decomposed or deteriorated during storage and use, thereby ensuring stable product quality and long-term stable use.

[0032] The application provides application of the corrosion and scale inhibitor in preventing corrosion and scale formation in a cooling circulating water system.

[0033] The application is customized according to the water quality and operation characteristics of the cooling circulating water system in the chemical industry, the papermaking industry, the fermentation industry and the corn deep processing industry. The chemical industry has many corrosive and scaling ions, and through the dosing ratio of 1:(1-1.8) of the A agent and the B agent and the dosing amount of 150-250 mg / L, the corrosion and scale formation can be effectively resisted; the papermaking industry has many organic matters, and the ratio of 1:(3-3.5) and the amount of 100-200 mg / L can reduce interference; the fermentation and corn deep processing industries have many microorganisms, and the ratio of 1:(3-5) and the dosing amount of 4-100 mg / L can control the growth of microorganisms, so that the specific needs of various industries are met.

[0034] The application clearly defines the dosing ratio and the amount, reduces the operation difficulty of enterprises in actual application, does not need complex equipment and technology, reduces the use threshold, and improves the production efficiency. DETAILED DESCRIPTION

[0035] The application provides a corrosion and scale inhibitor, which comprises an A agent and a B agent.

[0036] The preparation raw materials of the A agent include 10-18 parts of polyepoxysuccinic acid (sodium), 20-25 parts of polyacrylic acid (sodium), 10-15 parts of zinc salt, 5-8 parts of chromate, 7-11 parts of imidazoline compound and the balance of water, with the total mass being 100 parts.

[0037] The B agent comprises 20-25 parts of polyaspartic acid, 16-20 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 10-15 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 5-10 parts of benzotriazole and the balance of water, with the total mass being 100 parts.

[0038] In the application, the raw materials used are all commercially available goods well known in the art without special instructions.

[0039] The A agent will be described first.

[0040] The total mass of the A agent is 100 parts.

[0041] In the application, the preparation raw materials of the A agent include 10-18 parts of polyepoxysuccinic acid (sodium), which can be 10, 11, 12, 13, 14, 15, 16, 17 or 18 parts in specific embodiments.

[0042] In the present invention, the raw materials for preparing the agent A include 20-25 parts of polyacrylic acid (sodium), and in specific embodiments, it can be 20, 21, 22, 23, 24 or 25 parts.

[0043] In the present invention, the polyepoxysuccinic acid (sodium) and polyacrylic acid (sodium) are polyelectrolytes that ionize into a large number of negatively charged ionic groups in aqueous solution. The metal surface usually carries a certain positive charge in water. Based on the principle of electrostatic attraction, the charged groups of polyepoxysuccinic acid (sodium) and polyacrylic acid (sodium) will quickly adsorb to the metal surface. As the adsorption amount continues to increase, these molecules are oriented and arranged on the metal surface, gradually forming a dense polymer protective film. This protective film acts as a physical barrier, which can effectively prevent corrosive substances such as dissolved oxygen and chloride ions in water from directly contacting the metal surface, thereby slowing down the corrosion rate of the metal.

[0044] In the present invention, the raw materials for preparing the agent A include 10-15 parts of zinc salt, and in specific embodiments, it can be 10, 11, 12, 13, 14 or 15 parts. In the present invention, the zinc salt preferably includes zinc chloride and / or zinc nitrate.

[0045] In the present invention, the raw materials for preparing the agent A include 5-8 parts of chromate, and in specific embodiments, it can be 5, 6, 7 or 8 parts. In the present invention, the chromate preferably includes one or more of sodium chromate, potassium chromate, sodium dichromate and potassium dichromate.

[0046] In the present invention, the zinc salt dissociates into zinc ions in water, while the chromate salt produces chromate ions. When these ions diffuse onto the metal surface, they undergo a series of chemical reactions with the metal. For example, in the case of iron-based metals, the zinc ions and chromate ions react with the corrosion products of the iron to form a poorly soluble zinc-iron-chromium composite precipitate. This precipitate is not only dense but also chemically stable, further enhancing its protective effect on the metal and significantly improving its corrosion inhibition effectiveness.

[0047] In the present invention, the raw materials for preparing the agent A include 7-11 parts of imidazoline compounds, and in specific embodiments, can be 7, 8, 9, 10 or 11 parts. In the present invention, the imidazoline compounds preferably include cycloalkyl imidazoline and / or sulfur-containing imidazoline; the cycloalkyl imidazoline preferably includes cyclohexyl imidazoline and / or cyclopentyl imidazoline; the sulfur-containing imidazoline preferably includes one or more of 2-thiol imidazoline, thioether imidazoline and sulfone imidazoline. In the present invention, the molecular structure of the imidazoline compound contains atoms with lone pairs of electrons such as nitrogen and oxygen. These atoms can form coordination bonds with the empty orbitals on the metal surface, thereby allowing the imidazoline compound to be firmly adsorbed on the metal surface. The adsorbed imidazoline compound forms an adsorption film on the metal surface, which changes the charge distribution and interface properties of the metal surface, inhibits processes such as anodic dissolution and cathode oxygen absorption in the corrosion reaction, and effectively reduces the corrosion rate of the metal.

[0048] The raw materials for preparing the agent A also include a balance of water; the water is preferably deionized water.

[0049] In the present invention, poly(sodium) epoxysuccinate and poly(sodium) acrylic acid serve as high molecular weight polymers, with their molecular chains extending and entangled with each other to form a polymer system with a spatial network structure. This system not only has a large specific surface area, capable of adsorbing scale-forming ions in water, but also can form an adsorption film on the metal surface, isolating the metal from the corrosive medium. Zinc salt ionizes zinc ions in water, which react with chromate ions generated by chromate ionization to form a complex with good corrosion inhibition properties. This complex can form a precipitation film on the metal surface, further enhancing the metal's corrosion resistance. Imidazoline compounds form a dense protective film on the metal surface through physical and chemical adsorption, effectively inhibiting the metal's anodic dissolution and cathode hydrogen evolution reaction, thereby slowing the metal's corrosion rate. At the same time, active groups such as carboxyl and hydroxyl groups in the polymer system undergo chelation reactions with scale-forming ions such as calcium and magnesium ions in water, encapsulating the scale-forming ions, reducing their free ion concentration, and inhibiting scale formation.

[0050] Agent B is described below.

[0051] The total mass of the B agent is calculated as 100 parts.

[0052] In the present invention, the raw materials for preparing the agent B include 20-25 parts of polyaspartic acid, and in specific embodiments, can be 20, 21, 22, 23, 24, or 25 parts. In the present invention, the polyaspartic acid molecules contain a large number of functional groups such as carboxyl and amino groups, which have a strong chelating ability for metal ions such as calcium and magnesium. When polyaspartic acid is added to the cooling circulating water, the carboxyl and amino groups in its molecules will undergo a chelating reaction with the calcium and magnesium ions to form stable water-soluble chelates. This chelating action binds the free calcium and magnesium ions that are prone to scale formation, reducing the effective concentration of calcium and magnesium ions in the water, thereby inhibiting the formation of scale. In addition, polyaspartic acid also has good biodegradability, reducing potential harm to the environment.

[0053] In the present invention, the raw materials for preparing the agent B include 16-20 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, and in specific embodiments, it can be 16, 17, 18, 19 or 20 parts.

[0054] In the present invention, the raw materials for preparing the agent B include 10-15 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, and in specific embodiments, it can be 10, 11, 12, 13, 14 or 15 parts.

[0055] In the present invention, the acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer and acrylic acid-hydrolyzed polymaleic anhydride copolymer possess unique molecular structures. They can adsorb onto the surfaces of tiny scale crystals in water, imparting identical charges to the scale crystals. Because like charges repel each other, these scale crystals cannot aggregate and grow, but instead disperse uniformly in the water as tiny particles. Furthermore, these polymers interact with suspended matter in the water, keeping it dispersed and preventing it from settling on equipment surfaces, further reducing scale formation.

[0056] When calcium and magnesium ions in the water begin to form scale crystals, molecules of polyaspartic acid, acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, and acrylic acid-hydrolyzed polymaleic anhydride copolymer become embedded in the scale crystal lattice. Because the structures of these polymer molecules differ from the normal lattice structure of scale crystals, their embedding causes lattice distortion. This distorted lattice makes it difficult for scale crystals to continue growing normally, thus changing the scale's morphology and properties, making it loose and easily carried away by water flow, effectively preventing scale from depositing on equipment surfaces.

[0057] In the present invention, the raw materials for preparing the agent B include 5-10 parts of benzotriazole, and in specific embodiments, it can be 5, 6, 7, 8, 9 or 10 parts. In the present invention, the benzotriazole can chemically adsorb with the active sites on the metal surface to form a stable protective film, thereby improving the metal's antioxidant capacity and preventing the metal from being corroded. It has a special corrosion inhibition effect on copper and copper alloys. In the cooling circulating water system, the benzotriazole molecules can form a stable complex film with the copper atoms on the copper surface. This complex film not only prevents the copper atoms from being oxidized, but also inhibits the corrosion of copper by other corrosive substances in the water, thereby effectively protecting the copper components in the system and extending their service life.

[0058] In the present invention, the raw materials for preparing the agent B also include a balance of water; the water is preferably deionized water.

[0059] The present invention provides a method for preparing the corrosion and scale inhibitor described in the above scheme, comprising the following steps:

[0060] Mix the raw materials for preparing Agent A and react at 45-55°C for 1.5-2.5 hours to obtain Agent A;

[0061] Mix the raw materials for preparing Agent B and react at 65-70°C for 1.5-2.5h to obtain Agent B.

[0062] In a specific embodiment, the reaction temperature for preparing the agent A can be 45°C, 48°C, 50°C, 53°C or 55°C, and the reaction time can be 1.5h, 2h or 2.5h; the reaction temperature for preparing the agent B can be 65°C, 66°C, 67°C, 68°C, 69°C or 70°C, and the reaction time can be 1.5h, 2h or 2.5h.

[0063] In the present invention, the reaction for preparing the agent A and the agent B is preferably carried out under stirring conditions.

[0064] The present invention prepares Agent A at 45-55°C, which facilitates the extension and intertwining of the molecular chains of poly(sodium) epoxysuccinate and poly(sodium) acrylic acid, thereby forming a polymer system with a spatial network structure. This system not only has a large specific surface area for adsorbing scale-forming ions in water, but also forms an adsorption film on the metal surface, isolating the metal from corrosive media.

[0065] The present invention prepares Agent B at 65-70°C, allowing a graft copolymerization reaction to occur between polyaspartic acid, acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, and acrylic acid-hydrolyzed polymaleic anhydride copolymer. This increases the polymer's molecular chain length and enhances the steric hindrance effect. This helps disperse tiny particles in the water and prevents them from aggregating to form large scale particles.

[0066] The present invention provides the use of the corrosion and scale inhibitor described in the above scheme or the corrosion and scale inhibitor prepared by the preparation method described in the above scheme in preventing corrosion and scaling in a cooling circulating water system.

[0067] In application, the present invention preferably mixes agent A and agent B first, and then adds the obtained corrosion and scale inhibitor into the cooling circulating water system.

[0068] In the present invention, the cooling circulating water system preferably includes a cooling circulating water system of the chemical, papermaking, fermentation or corn deep processing industry.

[0069] In the present invention, the chemical cooling circulating water system is characterized by corrosiveness and a high number of scaling ions. For the chemical cooling circulating water system, the mass ratio of the agent A to the agent B is preferably 1: (1-1.8), and the total dosage of the agent A and the agent B is 150-250 mg / liter of cooling circulating water; in a specific embodiment, the mass ratio of the agent A to the agent B can be 1: 1.5, 1: 1.8, 1: 1.2, 1: 1.4, 1: 1.6; the total dosage can be 200 mg / L, 250 mg / L, 180 mg / L, 150 mg / L, 220 mg / L. The present invention does not specifically limit the chemical cooling circulating water system, and is applicable to cooling circulating water systems in pesticide chemicals, petrochemicals, and chemical production.

[0070] In the present invention, the cooling circulating water in the papermaking industry contains a large amount of organic matter; when the cooling circulating water system is a cooling circulating water system in the papermaking industry, the mass ratio of the agent A to the agent B is 1:(2-3.5), and the total dosage of the agent A and the agent B is 100-200 mg / liter of cooling circulating water. In specific embodiments, the mass ratio of the agent A to the agent B can be 1:2, 1:2.5, 1:3.2, or 1:3.5; the total dosage can be 150 mg / L, 180 mg / L, 100 mg / L, 130 mg / L, or 200 mg / L.

[0071] In the present invention, there are many microorganisms in the cooling circulating water of the fermentation and corn deep processing industries. When the cooling circulating water system is a cooling circulating water system of the fermentation and corn deep processing industries, the mass ratio of the agent A to the agent B is 1: (3-5), and the total dosage of the agent A and the agent B is 40-100 mg / liter of cooling circulating water. In a specific embodiment, the mass ratio of the agent A to the agent B can be 1:3, 1:3.5, 1:4, 1:4.5, 1:5; the total dosage can be 40 mg / L, 50 mg / L, 70 mg / L, 80 mg / L, 90 mg / L, 100 mg / L.

[0072] The present invention has no special requirements for the dosing method. A suitable dosing method is selected according to the characteristics of the cooling circulating water to ensure that the corrosion inhibitor and scale inhibitor are evenly distributed in the cooling circulating water.

[0073] The present invention customizes differentiated dosing schemes based on the water quality and operating characteristics of cooling circulating water systems in industries such as chemical, papermaking, fermentation and corn deep processing. Through precise dosing, it can meet the specific needs of each industry.

[0074] The corrosion and scale inhibitor provided by the present invention, its preparation method and application are described in detail below with reference to the examples, but they should not be construed as limiting the scope of protection of the present invention.

[0075] In the following cases, the preparation method of Agent A is as follows: polyepoxysuccinic acid (sodium), polyacrylic acid (sodium), zinc salt, chromate, and imidazoline compound are accurately weighed in strict accordance with the formula, and an appropriate amount of deionized water is measured; the above raw materials are added to the reactor in sequence, the temperature in the reactor is accurately controlled to 50°C, and the reaction is continuously stirred for 2 hours to obtain Agent A.

[0076] The preparation method of Agent B is as follows: accurately weigh polyaspartic acid, acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, and benzotriazole according to the formula, and at the same time measure an appropriate amount of deionized water, add these raw materials into another reactor, control the temperature in the reactor at 67°C, and continue stirring the reaction for 2 hours to obtain Agent B.

[0077] In the following cases, polyepoxysuccinic acid (sodium) was purchased from Shandong Taihe Technology, TH-PESA-30-650;

[0078] Polyacrylic acid (sodium) was purchased from Shanghai Aladdin, M29071-25G;

[0079] Polyaspartic acid was purchased from Yuanlian Chemical: product model: YL2021-PASP-Na;

[0080] Acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer and acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer were purchased from Shandong Jinguang Chemical;

[0081] Sulfone imidazoline was purchased from Jinan Shouyue Chemical, model MZL0876;

[0082] Cyclopentyl imidazoline was purchased from Hubei Shishun Chemical Industry, model SHY1-2-70C5.

[0083] Example 1 (Chemical Industry Case)

[0084] (1) Project Overview

[0085] A large chemical enterprise in Mianyang, Sichuan, uses a cooling water circulation system mainly for cooling production equipment. The circulating water volume of the system is 15,000 m 3The raw water has a calcium hardness of 350 mg / L, a total alkalinity of 280 mg / L, and a chloride ion content of 400 mg / L, and is highly corrosive and prone to scaling.

[0086] (2) Drug Usage Plan

[0087] Ingredient ratio: In Agent A, 15 parts of sodium polyepoxysuccinate, 23 parts of sodium polyacrylate, 13 parts of zinc nitrate, 7 parts of sodium chromate, 9 parts of imidazolines (specifically sulfone imidazoline), and the rest are made up with deionized water; in Agent B, 23 parts of polyaspartic acid, 18 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 12 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 8 parts of benzotriazole, and the rest are made up with deionized water.

[0088] Dosage ratio: The mass ratio of Agent A and Agent B is 1:1.5, and the dosage is 200 mg / L (i.e. the total mass of Agent A and Agent B added per liter of cooling circulating water is 200 mg, the same below).

[0089] (3) Usage effect

[0090] Comprehensive corrosion inhibition rate: After 3 months of continuous monitoring, the corrosion rate of the system's carbon steel coupons dropped from 0.19mm / a to 0.017mm / a, and the comprehensive corrosion inhibition rate reached 91.1%.

[0091] Comprehensive scale inhibition rate: The formation of scale such as calcium carbonate and calcium sulfate in the system is effectively suppressed, and the comprehensive scale inhibition rate reaches 98.2%.

[0092] Concentration ratio: The concentration ratio of cooling circulating water has been increased from the original 2.5 to 4.0, effectively improving water resource utilization.

[0093] Water quality parameters: After treatment, the calcium hardness stabilized at 320 mg / L, the total alkalinity was 260 mg / L, and the chloride ion content was maintained at around 400 mg / L. There was no deterioration of water quality caused by scaling and corrosion.

[0094] Example 2 (Chemical Industry Case)

[0095] (1) Project Overview

[0096] A large chlor-alkali chemical plant in Binzhou, Shandong Province, relied on a circulating water system to cool key equipment such as electrolytic cells and coolers. The circulating water volume was 18,000 m³. The raw water had a calcium hardness of 600 mg / L, a total alkalinity of 350 mg / L, and a chloride ion content of 1,500 mg / L. Furthermore, the production process generated free chlorine, which was highly oxidizing and caused severe equipment corrosion and scaling problems.

[0097] (2) Drug Usage Plan

[0098] Ingredient ratio: In Agent A, 18 parts of sodium polyepoxysuccinate, 25 parts of sodium polyacrylate, 15 parts of zinc nitrate, 8 parts of potassium chromate, 11 parts of imidazolines (specifically cyclopentyl imidazoline), and the rest are made up with deionized water; in Agent B, 25 parts of polyaspartic acid, 20 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 15 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 10 parts of benzotriazole, and the rest are made up with deionized water.

[0099] Dosage ratio: The mass ratio of Agent A to Agent B is 1:1.8, and the dosage is 250mg / L. With the help of an automated dosing system, the dosage of the agent is accurately determined based on the real-time changes in the circulating water flow and water quality.

[0100] (3) Usage effect

[0101] Comprehensive corrosion inhibition rate: Monitoring was conducted for six months, with the corrosion rate of carbon steel coupons tested every two weeks. Before adding the agent, the corrosion rate was 0.25 mm / a. After one month, it dropped to 0.08 mm / a; after three months, it dropped to 0.03 mm / a; and after six months, it stabilized at 0.02 mm / a, resulting in a comprehensive corrosion inhibition rate of 92%.

[0102] Comprehensive scale inhibition rate: By analyzing the amount of scale deposits such as calcium carbonate and calcium sulfate in the circulating water system, before adding the agent, the scale deposition amount was 8kg per month; after 1 month of addition, it dropped to 2kg; after 3 months, it dropped to 0.6kg, and finally stabilized at 0.5kg, with a comprehensive scale inhibition rate of 93.75%.

[0103] Concentration ratio: The concentration ratio of cooling circulating water increased from an initial 2.0 to 2.6 after one month, to 3.2 after three months, and finally stabilized at 3.5, greatly improving water resource utilization.

[0104] Water quality parameters: After treatment, calcium hardness stabilized at 420 mg / L, total alkalinity 300 mg / L, chloride ion content 1500 mg / L, and free chlorine concentration dropped to 0.5 mg / L, effectively controlling water quality deterioration.

[0105] Example 3 (fine chemical enterprise case)

[0106] (1) Project Overview

[0107] A fine chemical company in Weifang, Shandong, uses a circulating water system to cool reactors, distillation towers, and other equipment. The circulating water volume is 2,000 m³. The raw water has a calcium hardness of 300 mg / L and a total alkalinity of 250 mg / L. Due to the characteristics of the raw materials and processes used, the water contains trace amounts of heavy metal ions, such as copper, at a concentration of approximately 5 mg / L, increasing the risk of equipment corrosion and scaling.

[0108] (2) Drug Usage Plan

[0109] Ingredient ratio: In A agent, sodium polyepoxysuccinate 12 parts, sodium polyacrylate 21 parts, zinc nitrate 11 parts, potassium chromate 6 parts, imidazoline (specifically cyclopentyl imidazoline) 8 parts, and the rest is made up with deionized water; in B agent, polyaspartic acid 21 parts, acrylic acid-itaconic acid-allyl polyoxyethylene copolymer 16 parts, acrylic acid-hydrolyzed polymaleic anhydride copolymer 10 parts, benzotriazole 6 parts, and the rest is made up with deionized water.

[0110] Dosage ratio: the mass ratio of A agent and B agent is 1:1.2, and the dosage is 180 mg / L. Artificial timing dosing is adopted to ensure uniform distribution of the agent in the system.

[0111] (III) Effect of use

[0112] Comprehensive inhibition rate: monitor for 4 months, and detect the corrosion rate of carbon steel hanging piece every month. Before adding the agent, the corrosion rate is 0.15 mm / a; after 1 month, it is reduced to 0.05 mm / a; after 2 months, it is reduced to 0.025 mm / a; after 4 months, it is stabilized at 0.02 mm / a, and the comprehensive inhibition rate is 86.7%.

[0113] Comprehensive scale inhibition rate: monitor the formation of scales such as calcium carbonate and calcium sulfate in water, and before adding the agent, the scale generation amount is 4.2 kg per month; after 1 month, it is reduced to 0.9 kg; after 2 months, it is reduced to 0.5 kg, and finally stabilized at 0.4 kg, and the comprehensive scale inhibition rate is 90.5%.

[0114] Concentration ratio: the concentration ratio of cooling circulating water is increased from 2.3 to 2.8 after 1 month, to 3.0 after 2 months, and finally stabilized at 3.1, reducing the use of fresh water.

[0115] Water quality parameters: after treatment, the calcium hardness is 260 mg / L, the total alkalinity is 220 mg / L, and the copper ion concentration is reduced to 2 mg / L, effectively reducing the impact on equipment.

[0116] Example 4 (papermaking industry case)

[0117] (I) Project overview

[0118] A paper mill in Qingdao, Shandong, mainly serves the cooling of equipment such as paper machines, and the circulating water volume is 8000 m3. The original water has high organic matter content, with chemical oxygen demand (COD) of 150 mg / L, calcium hardness of 250 mg / L, and total alkalinity of 200 mg / L.

[0119] (II) Agent use scheme

[0120] Ingredient ratio: In Agent A, 13 parts of sodium polyepoxysuccinate, 22 parts of sodium polyacrylate, 12 parts of zinc nitrate, 6 parts of sodium chromate, 8 parts of imidazolines (specifically sulfone imidazoline), and the rest are made up with deionized water; in Agent B, 22 parts of polyaspartic acid, 17 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 11 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 7 parts of benzotriazole, and the rest are made up with deionized water.

[0121] Dosage ratio: The mass ratio of agent A and agent B is 1:2.5, and the dosage is 150 mg / L.

[0122] (3) Usage effect

[0123] Comprehensive corrosion inhibition rate: Through monitoring of equipment corrosion, the corrosion rate of carbon steel coupons dropped from 0.14mm / a to 0.013mm / a, and the comprehensive corrosion inhibition rate reached 90.7%.

[0124] Comprehensive scale inhibition rate: The formation of scales such as calcium carbonate and calcium sulfate in water is controlled, and the comprehensive scale inhibition rate reaches 99%.

[0125] Concentration ratio: The concentration ratio of cooling circulating water is increased from the original 2.0 to 3.5, reducing the amount of fresh water replenishment.

[0126] Water quality parameters: After treatment, COD dropped to 120mg / L, calcium hardness 220mg / L, and total alkalinity 180mg / L, effectively reducing the impurity content in the water and minimizing the impact on equipment.

[0127] Example 5 (Packaging Paper Production Plant Case)

[0128] (1) Project Overview

[0129] A packaging paper production plant in Nanyang, Henan Province, uses a cooling water circulation system to cool paper machines, dryers and other equipment. The circulating water volume is 15,000 m 3 The raw water COD is 300mg / L, the calcium hardness is 350mg / L, the total alkalinity is 300mg / L, and the raw water contains a large amount of suspended particulate matter, mainly fine fibers and fillers produced in the papermaking process, with a content of about 200mg / L, which can easily cause pipe blockage and scaling.

[0130] (2) Drug Usage Plan

[0131] Ingredient ratio: In Agent A, 15 parts of sodium polyepoxysuccinate, 23 parts of sodium polyacrylate, 13 parts of zinc nitrate, 7 parts of sodium chromate, 9 parts of imidazolines (specifically sulfone imidazoline), and the rest are made up with deionized water; in Agent B, 23 parts of polyaspartic acid, 18 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 12 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 8 parts of benzotriazole, and the rest are made up with deionized water.

[0132] Dosage ratio: The mass ratio of Agent A to Agent B is 1:3.2, and the dosage is 180 mg / L. The agents are added according to the set time and dosage through the automatic dosing device.

[0133] (3) Usage effect

[0134] Comprehensive corrosion inhibition rate: Monitoring was conducted for five consecutive months, with the corrosion rate of carbon steel coupons tested every two weeks. Before adding the agent, the corrosion rate was 0.21 mm / a. After one month, it dropped to 0.06 mm / a; after three months, it dropped to 0.025 mm / a; and after five months, it stabilized at 0.02 mm / a, resulting in a comprehensive corrosion inhibition rate of 90.5%.

[0135] Comprehensive scale inhibition rate: Analysis of the amount of scale deposits such as calcium carbonate and calcium sulfate in the water showed that before adding the agent, the monthly scale generation was 6kg; after 1 month of addition, it dropped to 1.5kg; after 3 months, it dropped to 0.6kg, and finally stabilized at 0.5kg, with a comprehensive scale inhibition rate of 91.7%.

[0136] Concentration ratio: The concentration ratio of cooling circulating water increased from 2.0 to 2.4 after one month, and to 2.8 after three months, and finally stabilized at 3.0, reducing fresh water consumption.

[0137] Water quality parameters: After treatment, COD dropped to 220mg / L, calcium hardness to 300mg / L, total alkalinity to 260mg / L, and suspended particulate matter content to 80mg / L, improving water quality and ensuring normal operation of equipment.

[0138] Example 6 (Specialty Paper Production Enterprise Case)

[0139] (1) Project Overview

[0140] A specialty paper production enterprise in Qingdao, Shandong, uses a cooling water circulation system to cool paper machines and auxiliary equipment. The circulating water volume is 7500m 3 The raw water COD is 450mg / L, the calcium hardness is 280mg / L, and the total alkalinity is 230mg / L. Due to the addition of special chemicals in the production of specialty paper, the water contains a small amount of organic phosphonate with a concentration of about 10mg / L, which has a certain impact on the performance of corrosion and scale inhibitors.

[0141] (2) Drug Usage Plan

[0142] Ingredient ratio: In Agent A, 14 parts of sodium polyepoxysuccinate, 22 parts of sodium polyacrylate, 12 parts of zinc nitrate, 6 parts of sodium chromate, 8 parts of imidazolines (specifically sulfone imidazoline), and the rest are made up with deionized water; in Agent B, 22 parts of polyaspartic acid, 17 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 11 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 7 parts of benzotriazole, and the rest are made up with deionized water.

[0143] Dosage ratio: The mass ratio of Agent A to Agent B is 1:2.5, and the dosage is 150 mg / L. Continuous dosing is used to maintain the effective concentration of the agent in the circulating water.

[0144] (3) Usage effect

[0145] Comprehensive corrosion inhibition rate: Monitoring was conducted for three consecutive months, with monthly testing of the corrosion rate of carbon steel coupons. Before adding the agent, the corrosion rate was 0.18 mm / a. After one month, it dropped to 0.045 mm / a; after two months, it dropped to 0.02 mm / a; and after three months, it stabilized at 0.018 mm / a, resulting in a comprehensive corrosion inhibition rate of 90.0%.

[0146] Comprehensive scale inhibition rate: The formation of scales such as calcium carbonate and calcium sulfate in the water was monitored. Before adding the agent, the monthly scale generation was 4.3 kg; after 1 month of addition, it dropped to 0.9 kg; after 2 months, it dropped to 0.6 kg, and finally stabilized at 0.4 kg, with a comprehensive scale inhibition rate of 90.7%.

[0147] Concentration ratio: The concentration ratio of cooling circulating water increased from 2.2 to 2.5 after one month, and to 2.7 after two months, and finally stabilized at 2.8, thus improving water resource utilization efficiency.

[0148] Water quality parameters: After treatment, COD dropped to 280 mg / L, calcium hardness 240 mg / L, total alkalinity 200 mg / L, and organic phosphonate concentration dropped to 5 mg / L, reducing adverse effects on equipment.

[0149] Example 7 (fermentation industry case)

[0150] (1) Project Overview

[0151] The cooling circulating water system of a fermentation enterprise in Inner Mongolia is used for cooling fermentation tanks, with a circulating water volume of 22,000 m3. The raw water has a high microbial content, with a total bacterial count of 1×10 5 CFU / mL, calcium hardness 200mg / L, total alkalinity 150mg / L.

[0152] (2) Drug Usage Plan

[0153] Ingredient ratio: In Agent A, 12 parts of polyepoxysuccinic acid, 21 parts of polyacrylic acid, 11 parts of zinc nitrate, 5 parts of potassium chromate, 7 parts of imidazolines (specifically cyclopentyl imidazoline), and the rest are made up with deionized water; in Agent B, 21 parts of polyaspartic acid, 16 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 10 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 6 parts of benzotriazole, and the rest are made up with deionized water.

[0154] Dosage ratio: The mass ratio of agent A to agent B is 1:4, and the dosage is 70 mg / L.

[0155] (Three) Effect of use

[0156] The corrosion rate of carbon steel hanging piece was reduced from 0.13 mm / a to 0.01 mm / a, and the comprehensive corrosion inhibition rate reached 92.3%.

[0157] The formation of scale such as calcium carbonate and calcium sulfate in the system was significantly reduced, and the comprehensive scale inhibition rate reached 98%.

[0158] Concentration ratio: The concentration ratio of cooling circulating water was increased from 1.5 to 3.5, saving water resources.

[0159] Water quality parameters: After treatment, the total number of bacteria was reduced to 1x103 CFU / mL, the calcium hardness was 180 mg / L, and the total alkalinity was 130 mg / L, effectively improving the water quality and ensuring the stable production of fermentation.

[0160] Example 8 (beer brewery case)

[0161] (I) Project overview

[0162] A beer brewery in Jinan, Shandong, the cooling circulating water system for fermentation tank, heat exchanger and other equipment cooling. Circulating water volume 4000m 3 , the total number of bacteria in raw water 5x10 5 CFU / mL, calcium hardness 250 mg / L, total alkalinity 200 mg / L, due to the addition of sugar and amino acids and other nutrients in the brewing process, rapid microbial reproduction, easy to cause biological scale and equipment corrosion.

[0163] (II) Drug use scheme

[0164] Component ratio: In A agent, polyepoxysuccinic acid 13 parts, polyacrylic acid 22 parts, zinc nitrate 12 parts, sodium chromate 5 parts, imidazoline (specifically cyclopentyl imidazoline) 8 parts, the rest is made up with deionized water; In B agent, polyaspartic acid 22 parts, acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer 17 parts, acrylic acid-hydrolyzed polymaleic anhydride copolymer 11 parts, benzotriazole 7 parts, the rest is made up with deionized water.

[0165] Dosage ratio: The mass ratio of A agent and B agent is 1:4.5, and the dosage is 90 mg / L. Intermittent dosing is adopted, combined with regular water quality detection to adjust the dosing frequency.

[0166] (Three) Effect of use

[0167] Comprehensive corrosion inhibition rate: monitor for 4 months, and detect the corrosion rate of carbon steel hanging piece every two weeks. Before adding the agent, the corrosion rate is 0.12 mm / a; after adding the agent for 1 month, it is reduced to 0.04 mm / a; after 2 months, it is reduced to 0.02 mm / a; after 4 months, it is stable at 0.012 mm / a, and the comprehensive corrosion inhibition rate is 90%.

[0168] Comprehensive scale inhibition rate: The amount of scale deposited in the system, such as calcium carbonate and calcium sulfate, was analyzed. Before adding the agent, the monthly scale generation was 5kg; after one month of addition, it dropped to 1.1kg; after two months, it dropped to 0.4kg, and finally stabilized at 0.3kg, with a comprehensive scale inhibition rate of 94%.

[0169] Concentration ratio: The concentration ratio of cooling circulating water increased from 1.8 to 2.2 after one month, and to 2.5 after two months, and finally stabilized at 2.7, saving water resources.

[0170] Water quality parameters: After treatment, the total bacterial count dropped to 5×103 CFU / mL, the calcium hardness was 210 mg / L, and the total alkalinity was 180 mg / L, ensuring that the beer brewing process is not affected by water quality.

[0171] Example 9 (Antibiotic Fermentation Enterprise Case)

[0172] (1) Project Overview

[0173] An antibiotic fermentation enterprise in Tongliao, Inner Mongolia, uses a cooling water system to cool fermentation tanks and bioreactors. The circulating water volume is 2500m3, and the total bacterial count in the raw water is 8×10 5 CFU / mL, calcium hardness 220mg / L, total alkalinity 180mg / L. Because antibiotic fermentation has extremely high requirements for water quality, fluctuations in water quality can easily affect the fermentation process and product quality.

[0174] (2) Drug Usage Plan

[0175] Ingredient ratio: In Agent A, 12 parts of polyepoxysuccinic acid, 21 parts of polyacrylic acid, 11 parts of zinc nitrate, 5 parts of sodium chromate, 7 parts of imidazolines (specifically cyclopentyl imidazoline), and the rest are made up with deionized water; in Agent B, 21 parts of polyaspartic acid, 16 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 10 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 6 parts of benzotriazole, and the rest are made up with deionized water.

[0176] Dosage ratio: The mass ratio of Agent A to Agent B is 1:5, and the dosage is 70 mg / L. Continuous micro-dosing is used to avoid interference with the fermentation process.

[0177] (3) Usage effect

[0178] Comprehensive corrosion inhibition rate: Monitoring was conducted for three consecutive months, with monthly testing of the corrosion rate of carbon steel coupons. Before adding the agent, the corrosion rate was 0.11 mm / a. After one month, it dropped to 0.035 mm / a. After three months, it dropped to 0.018 mm / a. After another three months, it stabilized at 0.01 mm / a, resulting in a comprehensive corrosion inhibition rate of 91%.

[0179] Comprehensive scale inhibition rate: The formation of calcium carbonate, calcium sulfate and other scales in the monitoring system was monitored. Before adding the agent, the monthly scale generation was 4kg; after 1 month of addition, it dropped to 0.9kg; after 3 months, it dropped to 0.4kg, and finally stabilized at 0.3kg, with a comprehensive scale inhibition rate of 92.5%.

[0180] Concentration ratio: The concentration ratio of cooling circulating water increased from 1.7 to 2.0 after one month, and to 2.3 after three months, and finally stabilized at 2.5, thus improving water resource utilization.

[0181] Water quality parameters: After treatment, the total bacterial count dropped to 8×103 CFU / mL, the calcium hardness was 190 mg / L, and the total alkalinity was 160 mg / L, meeting the strict water quality requirements for antibiotic fermentation.

[0182] Failure Case 1

[0183] (1) Project Overview

[0184] A chemical enterprise has run its cooling water circulation system dynamic test for one month, with a circulating water volume of 3m 3 The raw water has a calcium hardness of 380 mg / L, a total alkalinity of 300 mg / L, and a chloride ion content of 350 mg / L. The water quality is complex and has a high tendency to corrosion and scaling.

[0185] (2) Drug Usage Plan (without using polyaspartic acid)

[0186] Ingredient ratio: Agent A: 10 parts of polyepoxysuccinic acid, 25 parts of sodium polyacrylate, 15 parts of zinc nitrate, 8 parts of sodium chromate, 11 parts of imidazolines (specifically sulfone imidazoline), and the rest is made up with deionized water; Agent B: 20 ​​parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 15 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 10 parts of benzotriazole, and the rest is made up with deionized water.

[0187] Dosage ratio: The dosage ratio of Agent A and Agent B is 1:1.6, and the dosage is 220 mg / L.

[0188] (3) Usage effect

[0189] Comprehensive corrosion inhibition rate: After one month of operation, the corrosion rate of the carbon steel coupon dropped rapidly from the initial 0.12mm / a to 0.08mm / a, and the comprehensive corrosion inhibition rate was only 33.3%;

[0190] Comprehensive scale inhibition rate: Within one month, obvious scale deposition began to appear in the circulating water system, and the amount of scale such as calcium carbonate and calcium sulfate gradually increased. The comprehensive scale inhibition rate was only 20%;

[0191] Concentration ratio: due to serious corrosion and fouling problems, the concentration ratio can only be controlled at 2.0 to ensure system operation, and the water resource utilization rate cannot be effectively improved.

[0192] Water quality parameters: after treatment, the calcium hardness increased to 420 mg / L within 1 month, the total alkalinity was 320 mg / L, and the chloride content was basically unchanged at 350 mg / L, but a large amount of iron rust and other corrosion products appeared in the water, the water quality deteriorated obviously, and the turbidity increased from the initial 5 NTU to 20 NTU.

[0193] Failure case 2

[0194] (I) Project profile

[0195] The cooling circulating water system of a paper mill mainly cools the paper machines and other equipment, with a circulating water volume of 4000 m3. The original water COD is 180 mg / L, calcium hardness is 260 mg / L, total alkalinity is 220 mg / L, and contains a certain amount of fiber impurities.

[0196] (II) Drug use plan (without using polyepoxy succinic acid)

[0197] Component ratio: A agent uses sodium polyacrylate 23 parts, zinc nitrate 13 parts, sodium chromate 7 parts, imidazoline (specifically cyclopentyl imidazoline) 9 parts, and the rest is made up with deionized water; B agent polyaspartic acid 12 parts, acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer 18 parts, acrylic acid-hydrolyzed polymaleic anhydride copolymer 12 parts, benzotriazole 8 parts, and the rest is made up with deionized water.

[0198] Dosage ratio: the dosage ratio of A agent and B agent is 1:2.8, and the dosage is 160 mg / L.

[0199] (III) Effect of use

[0200] Comprehensive corrosion inhibition rate: after 1 month of operation, the corrosion rate of carbon steel hanging piece decreased from 0.1 mm / a to 0.06 mm / a, and the comprehensive corrosion inhibition rate was 40%;

[0201] Comprehensive scale inhibition rate: after 1 month, scale appeared on the surface of pipes and equipment, and the comprehensive scale inhibition rate was 65%.

[0202] Concentration ratio: due to fouling and corrosion problems, the concentration ratio can only be maintained at 2.2, and cannot be improved.

[0203] Water quality parameters: after 1 month, the calcium hardness increased to 290 mg / L, the total alkalinity was 230 mg / L, and the COD increased to 220 mg / L; the fiber impurities in the water mixed with scale and corrosion products, resulting in deterioration of water quality and affecting the normal operation of the paper machine.

[0204] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A corrosion and scale inhibitor, characterized in that: Includes dose A and dose B; The raw materials for preparing the agent A include, based on 100 parts by total mass, 10-18 parts of polyepoxysuccinic acid and / or sodium polyepoxysuccinate, 20-25 parts of polyacrylic acid and / or sodium polyacrylate, 10-15 parts of zinc salt, 5-8 parts of chromate, 7-11 parts of imidazoline compound, and the balance of water; The total mass is 100 parts. The raw materials for preparing the B agent include: 20-25 parts of polyaspartic acid, 16-20 parts of acrylic acid-itaconic acid-allyl polyoxyethylene ether copolymer, 10-15 parts of acrylic acid-hydrolyzed polymaleic anhydride copolymer, 5-10 parts of benzotriazole and the balance of water.

2. The corrosion and scale inhibitor according to claim 1, characterized in that The zinc salt includes zinc chloride and / or zinc nitrate.

3. The corrosion and scale inhibitor according to claim 1, characterized in that The chromate includes one or more of sodium chromate, potassium chromate, sodium dichromate and potassium dichromate.

4. The corrosion and scale inhibitor according to claim 1, characterized in that The imidazoline compounds include cycloalkyl imidazoline and / or sulfur-containing imidazoline.

5. The corrosion and scale inhibitor according to claim 4, characterized in that: The cycloalkyl imidazoline includes cyclohexyl imidazoline and / or cyclopentyl imidazoline, and the sulfur-containing imidazoline includes one or more of 2-thiol imidazoline, thioether imidazoline and sulfone imidazoline.

6. The corrosion and scale inhibitor according to any one of claims 1 to 5, characterized in that: The corrosion and scale inhibitor does not contain phosphorus.

7. The method for preparing the corrosion and scale inhibitor according to any one of claims 1 to 6, comprising the following steps: Mix the raw materials for preparing Agent A and react at 45-55°C for 1.5-2.5 hours to obtain Agent A; Mix the raw materials for preparing Agent B and react at 65-70°C for 1.5-2.5h to obtain Agent B.

8. Use of the corrosion inhibitor and scale inhibitor according to any one of claims 1 to 6 or the corrosion inhibitor and scale inhibitor prepared by the preparation method according to claim 7 in preventing corrosion and scaling in a cooling circulating water system.

9. The use according to claim 8, characterized in that The cooling circulating water system includes cooling circulating water systems in the chemical, papermaking, fermentation or corn deep processing industries.

10. The use according to claim 9, characterized in that When the cooling circulating water system is a chemical cooling circulating water system, the mass ratio of agent A to agent B is 1:(1-1.8), and the total dosage of agent A and agent B is 150-250 mg / liter of cooling circulating water; When the cooling circulating water system is a cooling circulating water system for the papermaking industry, the mass ratio of the agent A to the agent B is 1:(2-3.5), and the total dosage of the agent A and the agent B is 100-200 mg / liter of cooling circulating water; When the cooling circulating water system is a cooling circulating water system for the fermentation and corn deep processing industries, the mass ratio of agent A to agent B is 1:(3-5), and the total dosage of agent A and agent B is 40-100 mg / liter of cooling circulating water.