A scale and corrosion inhibitor composition, its preparation method and water treatment application

Abstract

This application relates to the field of industrial water treatment, and particularly to a scale and corrosion inhibitor composition, a preparation method thereof, and a water treatment application. The scale and corrosion inhibitor composition, in terms of mass percentage, comprises the following raw materials: 10-20% of a modified copolymer, 5-10% of a long-chain alkyl alkanolamine, 5-10% of an acrylic acid-acrylamide copolymer, 1-2% of a metal salt, 1-3% of a water-soluble zinc salt, 1-6% of a functional auxiliary agent, and the balance being deionized water. The scale and corrosion inhibitor composition prepared in this application not only has excellent scale and corrosion inhibition effects, but also can reduce the requirements of the scale and corrosion inhibitor composition for temperature, water quality, and dosage. It still has excellent scale and corrosion inhibition effects at a relatively high temperature, and has very excellent market prospects for use.

Description

Technical Field

[0001] The present application relates to the field of industrial water treatment, and particularly to a scale and corrosion inhibitor composition, a preparation method thereof, and a water treatment application thereof. Background Art

[0002] Industrial circulating water accounts for more than 50% of industrial water. If not treated during use, problems such as corrosion, scaling, and microbial slime will occur in equipment and pipelines, affecting the use efficiency and service life of the equipment and pipelines. Taking boiler water as an example, boiler steam condensate is high-quality boiler feed water containing heat energy. Recycling steam condensate is the most effective measure for boiler water conservation and energy conservation. If recycled and utilized, it can significantly reduce boiler fuel consumption, reduce the amount of softened water used, lower the production cost of steam, and improve the water quality of the boiler. However, when the pH of the condensate is low, corrosion products dissolve, and the condensate is contaminated by iron ions. When untreated condensate is used as boiler make-up water, a large amount of iron ions contained in the water will cause secondary scaling and under-scale corrosion on the boiler heat transfer surface, causing greater harm, making the direct recycling and utilization of steam condensate have great technical difficulties.

[0003] On the other hand, even if the problem of recycling and utilization of circulating water is further considered during use, at the same time, due to the lack of good pipeline anti-corrosion and scale inhibition means, the corrosion of pipelines is serious, and deposition and scaling are likely to occur. Generally used aeration filtration measures can, to a certain extent, reduce the concentration of scaling and corrosive metal ions, but still cannot effectively reduce the probability of pipeline corrosion, scaling and other phenomena. Therefore, the use of scale and corrosion inhibitors has become the main solution to the above technical problems in the domestic industrial field.

[0004] However, at the same time, due to the reasons of its formula, the existing scale and corrosion inhibitors have problems of high requirements for temperature, water quality, and dosage; especially some phosphorus-free corrosion and scale inhibitors have a narrow applicable range of water quality and temperature, poor scale inhibition effect outside the range, and problems such as high compounding difficulty and large compounding addition amount. Therefore, to solve the above problems, the present application provides a scale and corrosion inhibitor composition and a preparation method thereof. The scale and corrosion inhibitor composition prepared in the present application not only has excellent scale and corrosion inhibition effects, but also can reduce the requirements of the scale and corrosion inhibitor composition for temperature, water quality, and dosage. It still has excellent scale and corrosion inhibition effects at higher temperatures and has a very excellent market application prospect. Summary of the Invention

[0005] To solve the above problems, in the first aspect of the present application, a scale and corrosion inhibitor composition is provided. In terms of mass percentage, the raw materials include: 10-20% modified copolymer, 5-10% long-chain alkyl alkanolamine, 5-10% acrylic acid-acrylamide copolymer, 1-2% metal salt, 1-3% water-soluble zinc salt, 1-6% functional auxiliary agent, and the balance is deionized water.

[0006] As a preferred embodiment, the mass ratio of the modified copolymer, long-chain alkyl alkanolamine and acrylic acid-acrylamide copolymer is (15-20):(6-10):(8-10).

[0007] As a preferred embodiment, the mass ratio of the modified copolymer, long-chain alkyl alkanolamine and acrylic acid-acrylamide copolymer is (16-19):(6-8):(9-10).

[0008] As a preferred embodiment, the preparation method of the modified copolymer comprises the following steps: S1: adding epoxy succinic acid into an organic solvent, preheating to 60-65°C and keeping warm and stirring for 0.5-1 h; S2: after the stirring is completed, adding a reaction assistant, and dropwise adding a mixed solution of methacrylic acid and maleic acid into the solution of S1, the dropping temperature is 65-70°C, the dropping reaction time is 0.5-1 h, after the dropping is completed, heating to 80-85°C, keeping warm and reacting for 2-3 h, after the reaction is completed, filtering, washing and drying the product to obtain the modified copolymer.

[0009] As a preferred embodiment, the mass ratio of the epoxy succinic acid, reaction assistant, methacrylic acid and maleic acid is (10-15):(0.2-0.4):(3-4):(4-5).

[0010] As a preferred embodiment, the mass ratio of the epoxy succinic acid, reaction assistant, methacrylic acid and maleic acid is (12-14):(0.2-0.3):(3-3.5):(4-4.5).

[0011] As a preferred embodiment, the reaction assistant is potassium persulfate and triethylamine.

[0012] As a preferred embodiment, the mass ratio of the potassium persulfate and triethylamine is (1-1.5):(0.8-1).

[0013] As a preferred embodiment, the organic solvent is ethyl acetate.

[0014] In this application, by adding the above-mentioned modified copolymer, the scale inhibition and anti-corrosion functions of the scale inhibition and corrosion inhibition composition can be greatly improved, and it can effectively adapt to the high-temperature working environment of the water system, improve the working stability, and reduce the requirements for water quality selection. The modified copolymer can utilize the chelation of the carboxylic acid groups of methacrylic acid and maleic acid on its molecular chain with metal ions to greatly improve the formation efficiency of chelates in the water system and promote the precipitation of chelates; on the other hand, the modified copolymer can also, through the combined action of the functional additives in this application, form a barrier film with a certain thickness on the metal surface, and the modified copolymer can effectively and uniformly adsorb corrosive ions on the surface of the film, avoiding the direct contact between corrosive ions and the metal surface, and can also strengthen the binding effect of polyepoxysuccinic acid on calcium and magnesium ions, thereby forming fine scale particles in the water droplet phase of the water system, and then forming a loose system of fine scale particles, avoiding their aggregation and the structural phenomenon on the metal surface, and the loose chelate particles formed by binding with calcium and magnesium ions can hinder the growth of the crystal structures of calcium carbonate and magnesium, so that solid particles with a stable form cannot be formed and precipitated, and the above-mentioned hindering effect can be enhanced at high temperatures, and excellent performance stability can be obtained at high temperatures.

[0015] As a preferred embodiment, the long-chain alkyl alkanolamine is at least one of dodecyl alkanolamine, hexadecyl alkanolamine, and octadecyl alkanolamine.

[0016] As a preferred embodiment, the long-chain alkyl alkanolamine is a composition of dodecyl alkanolamine and octadecyl alkanolamine.

[0017] As a preferred embodiment, the mass ratio of dodecyl alkanolamine to octadecyl alkanolamine is (1 - 1.2):(3 - 4.5).

[0018] As a preferred embodiment, the acrylic acid-acrylamide copolymer is acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer.

[0019] As a preferred embodiment, the intrinsic viscosity of the acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer is 0.075 - 0.15 (30 °C) / dl·g -1 。

[0020] As a preferred embodiment, the intrinsic viscosity of the acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer is 0.08 - 0.1 (30 °C) / dl·g -1 。

[0021] As a preferred embodiment, the metal salt is at least one of molybdate metal salt, silicate metal salt, borate metal salt, and chloride metal salt.

[0022] As a preferred embodiment, the metal salts are sodium silicate and magnesium chloride.

[0023] As a preferred embodiment, the mass ratio of sodium silicate to magnesium chloride is (3-4):(0.5-1).

[0024] As a preferred embodiment, the mass ratio of sodium silicate to magnesium chloride is (3-3.5):(0.6-0.8).

[0025] As a preferred embodiment, the water-soluble zinc salt is at least one of zinc chloride, zinc sulfate, zinc gluconate, zinc acetate, and zinc citrate.

[0026] As a preferred embodiment, the water-soluble zinc salt is a composition of zinc sulfate and zinc gluconate.

[0027] As a preferred embodiment, the mass ratio of zinc sulfate to zinc gluconate is (2-2.5):(0.8-1).

[0028] As a preferred embodiment, the functional auxiliary is at least one of a dispersant, a wetting agent, an antifoaming agent, a cosolvent, and a stabilizer.

[0029] As a preferred embodiment, the functional auxiliary at least includes a dispersant.

[0030] As a preferred embodiment, the dispersant is a composition of fatty alcohol polyoxyethylene ether and block polyether.

[0031] As a preferred embodiment, the mass ratio of fatty alcohol polyoxyethylene ether to block polyether is (2-2.2):(0.5-0.8).

[0032] As a preferred embodiment, the fatty alcohol polyoxyethylene ether is isomeric 13 fatty alcohol polyoxyethylene ether.

[0033] As a preferred embodiment, the hydroxyl value of the isomeric 13 fatty alcohol polyoxyethylene ether is 70-90 mgKOH / g.

[0034] As a preferred embodiment, the weight-average molecular weight of the block polyether is 1200-5000.

[0035] As a preferred embodiment, the block polyether is a composition of a block polyether with a weight-average molecular weight of 1400-1800 and a block polyether with a weight-average molecular weight of 4500-5000.

[0036] As a preferred embodiment, the mass ratio of the block polyether with a weight-average molecular weight of 1400-1800 to the block polyether with a weight-average molecular weight of 4500-5000 is (2-3.5):(1-1.8).

[0037] As a preferred solution, the mass ratio of the block polyether with a weight-average molecular weight of 1400-1800 to the block polyether with a weight-average molecular weight of 4500-5000 is (2.5-3.2):(1.2-1.5).

[0038] In this application, the addition of the above compound dispersant can not only play an excellent role in dispersing the raw materials of the scale and corrosion inhibitor, but also further improve the stability of the scale and corrosion inhibitor under high-temperature conditions and the scale and corrosion inhibition effect, reduce its requirements for temperature and water quality, and effectively reduce the dosage of the scale and corrosion inhibitor. When the above specific fatty alcohol polyoxyethylene ether and block polyether are used, it can form multi-layer oily droplets formed by different viscosity phases in the water system. The existence of this droplet phase can effectively prevent the excessive aggregation of active reaction molecules in the water system, thereby greatly reducing the probability of adverse chemical reactions in the high-temperature active environment, avoiding the formation of other complex scales, and improving the stability of the scale and corrosion inhibitor in high-temperature water quality.

[0039] Secondly, the existence of the droplet phase can greatly reduce the intermolecular attraction between the scale components, attract the formation of tiny water slag particles into the droplet phase to complete, help disperse the scale-forming particles and tiny scale particles in the water, and greatly reduce their aggregation and deposition in the water system; finally, the use of the above solution can also effectively enhance the spreading property of water on the metal surface, increase the thickness of the surface protection film, thereby reducing the adhesion of the scale layer, isolating the metal and the corrosion medium, and the oriented film layer structure formed on the metal surface can effectively prevent the contact degree of the chemical corrosion medium with the metal surface, thereby playing an excellent scale and corrosion inhibition role.

[0040] The second aspect of this application provides a preparation method of the above scale and corrosion inhibitor composition. The preparation method includes the following steps: S1: Add the water-soluble zinc salt, metal salt and functional auxiliary agent to deionized water and stir evenly for standby; S2: Add the modified copolymer, long-chain alkyl alkanolamine and acrylic acid-acrylamide copolymer in sequence, heat up to 50-60 °C, stir evenly at a high speed of 200-300 rpm, take out until the product is viscous and uniform, and vacuum dry at 40-50 °C, and then crush and pass through a 200-400 mesh sieve. After completion, it is obtained.

[0041] The third aspect of this application provides an application of the above scale and corrosion inhibitor composition in water treatment.

[0042] The beneficial effects of this application are as follows:

[0043] 1. A scale and corrosion inhibitor composition provided in this application. The prepared scale and corrosion inhibitor composition not only has excellent scale and corrosion inhibition effects, but also can reduce the requirements of the scale and corrosion inhibitor composition for temperature, water quality and dosage. It still has excellent scale and corrosion inhibition effects at higher temperatures, and has a very excellent market application prospect.

[0044] 2. A scale and corrosion inhibitor composition provided in the present application can significantly improve the scale and corrosion inhibition functions of the scale and corrosion inhibitor composition by adding a modified copolymer, can effectively adapt to the high-temperature working environment of the water system, improve the working stability, and reduce the requirements for water quality selection; the modified copolymer can utilize the chelation of carboxylic acid groups of methacrylic acid and maleic acid on its molecular chain with metal ions to significantly improve the formation efficiency of chelates in the water system and promote the precipitation of chelates; on the other hand, the modified copolymer can also form a barrier film with a certain thickness on the metal surface through the combined action of the functional additives in the present application, and the modified copolymer can effectively and uniformly adsorb corrosive ions on the surface of the film, avoiding the direct contact between corrosive ions and the metal surface, and can also strengthen the binding effect of polyepoxysuccinic acid on calcium and magnesium ions.

[0045] 3. A scale and corrosion inhibitor composition provided in the present application can promote the formation of tiny scale particles in the water system droplet phase by adding a modified copolymer, and then form a loose system of tiny scale particles, avoiding their aggregation and the structural phenomenon on the metal surface, and the loose chelate particles formed by binding with calcium and magnesium ions can hinder the growth of calcium carbonate and magnesium crystal structures, so that solid particles with a stable form cannot be formed and precipitated, and on the contrary, the above hindering effect can be enhanced at high temperatures, and excellent performance stability can be obtained at high temperatures.

[0046] 4. A scale and corrosion inhibitor composition provided in the present application. The addition of a compound dispersant can not only play an excellent role in dispersing the raw materials of the scale and corrosion inhibitor, but also further improve the stability and scale and corrosion inhibition effect of the scale and corrosion inhibitor under high-temperature action, reduce its requirements for temperature and water quality, and effectively reduce the dosage of the scale and corrosion inhibitor. When the above-mentioned specific fatty alcohol polyoxyethylene ether and block polyether are used, it can form multi-layer oily droplets formed by different viscosity phases in the water system. The existence of this droplet phase can effectively avoid the excessive aggregation of active reaction molecules in the water system, thereby greatly reducing the probability of adverse chemical reactions in the high-temperature active environment, avoiding the formation of other complex scale, and improving the stability of the scale and corrosion inhibitor in high-temperature water quality. Detailed implementation mode

[0047] The technical solutions in the above-mentioned invention content of the present application will be further described and demonstrated below in the form of specific implementation examples. And the following examples are only actual examples for explaining and interpreting the content of the technical solutions in the specification, and should not limit the scope of the claims to be protected by the present application. All technical products based on the technical solutions described in the invention content of the present application should be covered within the scope to be protected by the present application.

[0048] In the following examples, unless otherwise specified, the raw materials are all commercially available products that can be obtained, or can be prepared by methods well known to those skilled in the art.

[0049] Example 1

[0050] In the first aspect of Example 1, a scale and corrosion inhibitor composition is provided. By mass percentage, the raw materials include: 18% modified copolymer, 7.5% long-chain alkyl alkanolamine, 9% acrylic acid-acrylamide copolymer, 1.2% metal salt, 2.1% water-soluble zinc salt, 5.5% functional additive, and the balance is deionized water.

[0051] The preparation method of the modified copolymer includes the following steps, by mass parts: S1: Add 13.4 parts of cis-epoxysuccinic acid to 180 parts of ethyl acetate, preheat to 60 °C and keep stirring for 0.6 h; S2: After the stirring is completed, add 0.23 part of reaction assistant, and dropwise add a mixed ethyl acetate solution (60 parts in total) of 3.25 parts of methacrylic acid and 4.2 parts of maleic acid to the solution of S1. The dropping temperature is 65 °C, the dropping reaction time is 0.8 h. After the dropping is completed, raise the temperature to 80 °C and keep reacting for 2.5 h. After the reaction is completed, filter, wash, and dry the product to obtain it.

[0052] The reaction assistant is potassium persulfate and triethylamine; the mass ratio of potassium persulfate to triethylamine is 1.3:1.

[0053] The long-chain alkyl alkanolamine is a composition of dodecyl alkanolamine and octadecyl alkanolamine, and the mass ratio of dodecyl alkanolamine to octadecyl alkanolamine is 1.1:3.8.

[0054] The acrylic acid-acrylamide copolymer is acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer, and the limiting viscosity is 0.085 (30 °C) / dl·g -1 , purchased from the corresponding product sold by Shandong Xingre Environmental Technology Co., Ltd.

[0055] The metal salt is sodium silicate and magnesium chloride, and the mass ratio of sodium silicate to magnesium chloride is 3.2:0.65.

[0056] The water-soluble zinc salt is a composition of zinc sulfate and zinc gluconate, and the mass ratio of zinc sulfate to zinc gluconate is 2.1:0.9.

[0057] The functional additive is a dispersant, and the dispersant is a composition of fatty alcohol polyoxyethylene ether and block polyether, and the mass ratio of fatty alcohol polyoxyethylene ether to block polyether is 2.2:0.6.

[0058] The fatty alcohol polyoxyethylene ether is isomeric 13 fatty alcohol polyoxyethylene ether, and the hydroxyl value of the isomeric 13 fatty alcohol polyoxyethylene ether is 88 mgKOH / g, purchased from the E-1310 product sold by Haining Guoyun Chemical Co., Ltd.

[0059] The block polyether is a composition of a block polyether with a weight average molecular weight of 1600 and a block polyether with a weight average molecular weight of 4600, and the mass ratio of the two is 2.8:1.3. The block polyether with a weight average molecular weight of 1600 and the block polyether with a weight average molecular weight of 4600 are respectively purchased from the L42 model and L85 model block polyether products of BASF.

[0060] In the second aspect of this embodiment, a preparation method of the above scale and corrosion inhibitor composition is provided. The preparation method includes the following steps: S1: Add the water-soluble zinc salt, metal salt and functional auxiliary agent into deionized water and stir evenly for standby; S2: Add the modified copolymer, long-chain alkyl alkanolamine and acrylic-acrylamide copolymer in sequence, heat up to 55 °C, stir evenly at a high speed of 280 rpm, take out after the product is viscous and uniform, and vacuum dry at 50 °C, and then crush and pass through a 250-mesh sieve, and it is obtained after completion.

[0061] Example 2

[0062] In the first aspect of Example 2, a scale and corrosion inhibitor composition is provided. In terms of mass percentage, the raw materials include: 15% modified copolymer, 8.5% long-chain alkyl alkanolamine, 10% acrylic-acrylamide copolymer, 1.4% metal salt, 2.2% water-soluble zinc salt, 5% functional auxiliary agent, and the balance is deionized water.

[0063] The preparation method of the modified copolymer includes the following steps, in parts by mass: S1: Add 13.4 parts of cis-epoxysuccinic acid to 180 parts of ethyl acetate, preheat to 60 °C and keep stirring for 0.6 h; S2: After the stirring is completed, add 0.23 parts of reaction auxiliary agent, and dropwise add a mixed ethyl acetate solution (60 parts in total) of 3.25 parts of methacrylic acid and 4.2 parts of maleic acid to the solution of S1, the dropping temperature is 65 °C, the dropping reaction time is 0.8 h, after the dropping is completed, heat up to 80 °C, keep the reaction for 2.5 h, and after the reaction is completed, filter, wash and dry the product to obtain it.

[0064] The reaction auxiliary agent is potassium persulfate and triethylamine; the mass ratio of potassium persulfate to triethylamine is 1.3:1.

[0065] The long-chain alkyl alkanolamine is a composition of dodecyl alkanolamine and octadecyl alkanolamine, and the mass ratio of dodecyl alkanolamine to octadecyl alkanolamine is 1:4.5.

[0066] The acrylic-acrylamide copolymer is acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer, and the limiting viscosity is 0.085 (30 °C) / dl·g -1 , and is purchased from the corresponding product sold by Shandong Xingre Environmental Technology Co., Ltd.

[0067] The metal salts are sodium silicate and magnesium chloride, and the mass ratio of sodium silicate to magnesium chloride is 3:0.8.

[0068] The water-soluble zinc salt is a composition of zinc sulfate and zinc gluconate, and the mass ratio of zinc sulfate to zinc gluconate is 2.5:0.8.

[0069] The functional auxiliary is a dispersant, and the dispersant is a composition of fatty alcohol polyoxyethylene ether and block polyether. The mass ratio of fatty alcohol polyoxyethylene ether to block polyether is 2:0.5.

[0070] The fatty alcohol polyoxyethylene ether is isomeric C13 fatty alcohol polyoxyethylene ether. The hydroxyl value of the isomeric C13 fatty alcohol polyoxyethylene ether is 88 mg KOH / g, and it is purchased as the E-1310 product sold by Haining Guoyun Chemical Co., Ltd.

[0071] The block polyether is a composition of a block polyether with a weight-average molecular weight of 1600 and a block polyether with a weight-average molecular weight of 4600. The mass ratio of the two is 2:1.6. The block polyether with a weight-average molecular weight of 1600 and the block polyether with a weight-average molecular weight of 4600 are purchased from the L42 model and L85 model block polyether products of BASF respectively.

[0072] In the second aspect of this embodiment, a preparation method of the above scale and corrosion inhibitor composition is provided. The preparation method includes the following steps: S1: Add the water-soluble zinc salt, metal salt, and functional auxiliary to deionized water and stir evenly for standby; S2: Add the modified copolymer, long-chain alkyl alkanolamine, and acrylic acid-acrylamide copolymer in sequence, heat up to 55°C, and stir evenly at a high speed of 280 rpm. After the product is viscous and uniform, take it out, vacuum dry it at 50°C, and then crush it through a 250-mesh sieve to obtain the finished product.

[0073] Comparative Example 1

[0074] The specific implementation manner of this comparative example is basically the same as that of Example 1, except that:

[0075] For the scale and corrosion inhibitor composition, by mass percentage, the raw materials include: 12% modified copolymer, 12% long-chain alkyl alkanolamine, 4.5% acrylic acid-acrylamide copolymer, 1.2% metal salt, 2.1% water-soluble zinc salt, 5.5% functional auxiliary, and the balance is deionized water.

[0076] Comparative Example 2

[0077] The specific implementation of this comparative example is basically the same as that of Example 1, except that: the preparation method of the modified copolymer includes the following steps, in parts by mass: S1: Add 22.4 parts of cis-epoxysuccinic acid to 240 parts of ethyl acetate, preheat to 60 °C and keep stirring for 0.8 h; S2: After the stirring is completed, add 0.35 part of reaction assistant, and dropwise add a mixed ethyl acetate solution (40 parts in total) of 1.5 parts of methacrylic acid and 2.1 parts of maleic acid to the solution of S1, the dropping temperature is 65 °C, the dropping reaction time is 0.6 h, after the dropping is completed, heat up to 80 °C, keep the reaction for 2.5 h, after the reaction is completed, filter, wash and dry the product to obtain it.

[0078] Comparative Example 3

[0079] The specific implementation of this comparative example is basically the same as that of Example 1, except that: the preparation method of the modified copolymer includes the following steps, in parts by mass: S1: Add 8.5 parts of cis-epoxysuccinic acid to 150 parts of ethyl acetate, preheat to 60 °C and keep stirring for 0.6 h; S2: After the stirring is completed, add 0.23 part of reaction assistant, and dropwise add a mixed ethyl acetate solution (80 parts in total) of 4.8 parts of methacrylic acid and 6.5 parts of maleic acid to the solution of S1, the dropping temperature is 65 °C, the dropping reaction time is 1 h, after the dropping is completed, heat up to 80 °C, keep the reaction for 3 h, after the reaction is completed, filter, wash and dry the product to obtain it.

[0080] Comparative Example 4

[0081] The specific implementation of this comparative example is basically the same as that of Example 1, except that: the limiting viscosity of the acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer is 0.055 (30 °C) / dl·g -1 , purchased from the corresponding product sold by Shandong Xingruige Environmental Technology Co., Ltd.

[0082] Comparative Example 5

[0083] The specific implementation of this comparative example is basically the same as that of Example 1, except that: the functional assistant is a dispersant, and the dispersant is a composition of fatty alcohol polyoxyethylene ether and block polyether, and the mass ratio of fatty alcohol polyoxyethylene ether to block polyether is 8:1.

[0084] Comparative Example 6

[0085] The specific implementation of this comparative example is basically the same as that of Example 1, except that: the functional assistant is a dispersant, and the dispersant is a composition of fatty alcohol polyoxyethylene ether and block polyether, and the mass ratio of fatty alcohol polyoxyethylene ether to block polyether is 1:1.

[0086] Comparative Example 7

[0087] The specific implementation method of this comparative example is basically the same as that of Example 1, except that the fatty alcohol polyoxyethylene ether is isomeric 13 fatty alcohol polyoxyethylene ether, the hydroxyl value of isomeric 13 fatty alcohol polyoxyethylene ether is 150 mgKOH / g, and it is purchased from E-1304 product sold by Hai'an Guoyun Chemical Co., Ltd.

[0088] Comparative Example 8

[0089] The specific implementation of this comparative example is basically the same as that of Example 1, except that the block polyether is a composition of a block polyether with a weight average molecular weight of 8400 and a block polyether with a weight average molecular weight of 10000, and the mass ratio of the two is 2:1.6. The block polyether with a weight average molecular weight of 8400 and the block polyether with a weight average molecular weight of 10000 are purchased from BASF as L68 and L88 block polyether products, respectively.

[0090] Performance Evaluation

[0091] Scale inhibition rate: The scale inhibition rate of the scale inhibition and corrosion inhibition composition of the embodiment and the comparative example was tested with reference to HG / T3924-2007 standard. The temperature of boiler return water was 72-75°C, the dosage of the scale inhibition and corrosion inhibition composition was 10 mg / L, and the test value was the average value of 10 tests and recorded in Table 1.

[0092] Corrosion inhibition rate: The corrosion inhibition rate of the scale and corrosion inhibition composition of the embodiment and the comparative example was tested with reference to HG / T3924-2007 standard. The test items were carbon steel and copper. The temperature of boiler return water was 72-75°C. The dosage of the scale and corrosion inhibition composition was 10 mg / L. The test value was the average value of 10 tests and recorded in Table 1.

[0093] Corrosion rate: The corrosion inhibition effect of the scale and corrosion inhibition composition was tested using a carbon steel test piece. The rotating hanging piece test was performed. The dosage of the scale and corrosion inhibition composition was 15 mg / L. The temperature of the boiler return water was 72-75°C. The test value was the average of 10 tests and recorded in Table 1.

[0094] Table 1 Performance test results

[0095]

[0096] From the examples and comparative examples of the present application and the data results in Table 1, it can be seen that examples 1 and 2 of the present application can have obvious performance advantages in scale inhibition, corrosion inhibition and stability by adopting the unique technical solution defined in the present application, and solve the technical problem that the existing scale inhibitors and corrosion inhibitors have too narrow requirements for water temperature, water quality, etc. However, comparative examples 1 to 8 are significantly worse than examples 1 and 2 in the above performance tests because they do not correctly adopt the corresponding defined technical solutions, which just proves the necessity of the technical solutions adopted in examples 1 and 2 for the technical effects of the present application.

Claims

1. A scale and corrosion inhibitor composition, characterized in that: By mass percentage, the raw materials include: 10-20% of modified copolymer, 5-10% of long-chain alkyl alkanolamine, 5-10% of acrylic acid-acrylamide copolymer, 1-2% of metal salt, 1-3% of water-soluble zinc salt, 1-6% of functional additive, and the balance of deionized water; The preparation method of the modified copolymer includes the following steps: S1: Add epoxy succinic acid to an organic solvent, and preheat to 60-65°C for heat preservation and stirring for 0.5-1 h; S2: After the stirring is completed, add a reaction aid, and dropwise add a mixed solution of methacrylic acid and maleic acid into the solution of S1. The dropping temperature is 65-70°C, the dropping reaction time is 0.5-1 h. After the dropping is completed, heat up to 80-85°C and keep the reaction for 2-3 h. After the reaction is completed, filter, wash and dry the product to obtain it; The mass ratio of the epoxy succinic acid, the reaction aid, the methacrylic acid and the maleic acid is (10-15):(0.2-0.4):(3-4):(4-5); The reaction aid is potassium persulfate and triethylamine; the mass ratio of the potassium persulfate and the triethylamine is (1-1.5):(0.8-1); The long-chain alkyl alkanolamine is at least one of dodecyl alkanolamine, cetyl alkanolamine and octadecyl alkanolamine; The acrylic acid-acrylamide copolymer is acrylic acid-2-acrylamido-2-methylpropane sulfonic acid copolymer; The intrinsic viscosity of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is 0.075 to 0.15 (30 °C) / dl·g -1 ; The metal salt is at least one of molybdate metal salt, silicate metal salt, borate metal salt and chloride metal salt; The water-soluble zinc salt is at least one of zinc chloride, zinc sulfate, zinc gluconate, zinc acetate and zinc citrate; The functional additive at least includes a dispersant; the dispersant is a composition of fatty alcohol polyoxyethylene ether and block polyether; The mass ratio of the fatty alcohol polyoxyethylene ether and the block polyether is (2-2.2):(0.5-0.8); The fatty alcohol polyoxyethylene ether is isomeric 13 fatty alcohol polyoxyethylene ether; The hydroxyl value of the isomeric 13 fatty alcohol polyoxyethylene ether is 70-90 mgKOH / g; The block polyether is a composition of a block polyether with a weight average molecular weight of 1400-1800 and a block polyether with a weight average molecular weight of 4500-5000, and the mass ratio is (2-3.5):(1-1.8).

2. The scale and corrosion inhibitor composition according to claim 1, wherein: The mass ratio of the modified copolymer, the long-chain alkyl alkanolamine and the acrylic acid-acrylamide copolymer is (15-20):(6-10):(8-10).

3. The scale and corrosion inhibitor composition according to claim 2, characterized in that: The long-chain alkyl alkanolamine is a composition of dodecyl alkanolamine and octadecyl alkanolamine.

4. The scale and corrosion inhibitor composition according to claim 3, characterized in that: The mass ratio of the dodecyl alkanolamine and the octadecyl alkanolamine is (1-1.2):(3-4.5).

5. The scale and corrosion inhibitor composition according to claim 4, wherein: The intrinsic viscosity of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is 0.08 to 0.1 (30 °C) / dl·g -1 .

6. The scale and corrosion inhibitor composition according to claim 5, wherein: The metal salt is sodium silicate and magnesium chloride; the mass ratio of the sodium silicate and the magnesium chloride is (3-4):(0.5-1).

7. The scale and corrosion inhibitor composition according to claim 6, wherein: The water-soluble zinc salt is a composition of zinc sulfate and zinc gluconate; the mass ratio of the zinc sulfate and the zinc gluconate is (2-2.5):(0.8-1).

8. A method for preparing the scale and corrosion inhibitor composition according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: S1: Add a water-soluble zinc salt, a metal salt and a functional auxiliary agent into deionized water, stir evenly, and set aside; S2: Add a modified copolymer, a long-chain alkyl alkanolamine and an acrylic acid-acrylamide copolymer in sequence, heat up to 50-60 °C, stir evenly at a high speed of 200-300 rpm, take out until the product is viscous and uniform, and vacuum dry at 40-50 °C, and then pulverize and pass through a 200-400 mesh sieve, and it is obtained after completion.

9. Use of the scale and corrosion inhibitor composition according to any one of claims 1 to 7 in water treatment.

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