阅读说明：本技术 一种咪唑基聚醚碳钢缓蚀剂及其制备和应用方法 (Imidazolyl polyether carbon steel corrosion inhibitor and preparation and application methods thereof ) 是由 南秋利 周钰明 于泳 余丽丽 李玲 朱旻昊 张佳佳 张慧贤 杨颜励 于 2020-12-08 设计创作，主要内容包括：本发明提供一种咪唑基聚醚碳钢缓蚀剂及其制备和应用方法,缓蚀效果好,水溶性高,且绿色环保。本发明实施例的咪唑基聚醚碳钢缓蚀剂,含有多个醚基功能性基团,使缓蚀剂在表面形成化学性质的吸附膜,缓蚀剂与吸附膜之间以化学键结合,作用力较大,即使在较高的温度条件下也可以对碳钢起到很好的缓蚀作用。含有多个醚基,酰胺基,羟基等亲水基团,可有效降低高分子聚合物的结晶度,且本发明缓蚀剂呈线性,水分子易进入高分子结构,由于大量醚健和酰胺键的存在,使得缓蚀剂具有一定的极性,从而具有较好的水溶性。本发明实施例的咪唑基聚醚碳钢缓蚀剂的制备方法,采用的三种主原料是绿色环保材料,合成得到的咪唑基聚醚碳钢缓蚀剂无毒、绿色环保。(The invention provides an imidazolyl polyether carbon steel corrosion inhibitor and preparation and application methods thereof, and the imidazolyl polyether carbon steel corrosion inhibitor is good in corrosion inhibition effect, high in water solubility and environment-friendly. The imidazolyl polyether carbon steel corrosion inhibitor provided by the embodiment of the invention contains a plurality of ether functional groups, so that the corrosion inhibitor forms an adsorption film with chemical properties on the surface, the corrosion inhibitor and the adsorption film are combined by chemical bonds, the acting force is large, and the corrosion inhibitor can play a good corrosion inhibition role on carbon steel even under a high temperature condition. The corrosion inhibitor contains a plurality of ether groups, amide groups, hydroxyl groups and other hydrophilic groups, can effectively reduce the crystallinity of a high molecular polymer, is linear, and water molecules easily enter a high molecular structure, so that the corrosion inhibitor has certain polarity due to the existence of a large number of ether bonds and amide bonds, thereby having better water solubility. According to the preparation method of the imidazolyl polyether carbon steel corrosion inhibitor provided by the embodiment of the invention, the three main raw materials are green and environment-friendly materials, and the synthesized imidazolyl polyether carbon steel corrosion inhibitor is non-toxic and environment-friendly.)

1. The imidazolyl polyether carbon steel corrosion inhibitor is characterized by having a structural general formula shown in formula (1):

wherein n is an integer of 12. ltoreq. n.ltoreq.52.

2. A method for preparing the imidazolyl polyether carbon steel corrosion inhibitor of claim 1, which comprises the following steps:

step 1, at room temperature, N₂In the environment, adding prenyl alcohol polyoxyethylene ether and alkali into a first reaction container, uniformly mixing, heating to 40-50 ℃, and reacting for 1-3 hours to obtain a mixed solution;

step 2, adding sodium hydroxide and chloroacetic acid into the mixed solution, heating to 70-100 ℃, and reacting for 4-6 hours to obtain a reaction solution; extracting the reaction solution, and carrying out vacuum filtration to obtain a first reactant;

step 3, dissolving the first reactant in water, adjusting the pH to 5-6 with dilute hydrochloric acid, carrying out reduced pressure distillation to remove water, filtering to obtain a second reactant, and drying the second reactant in a vacuum drying oven to obtain a dried substance;

step 4, placing the dried substance and imidazole in a second reaction container, stirring and dissolving at 100-110 ℃, heating to 130-150 ℃, and carrying out stirring reaction to obtain a third reactant;

and 5, purifying the third reactant by using a purification solvent at room temperature to obtain the imidazolyl polyether carbon steel corrosion inhibitor.

3. The preparation method of the imidazolyl polyether carbon steel corrosion inhibitor as claimed in claim 2, wherein the mass of the chloroacetic acid is 0.8 times of that of the prenyl alcohol polyoxyethylene ether and the mass of the imidazole is 1.5 times of that of the prenyl alcohol polyoxyethylene ether based on the mass of the prenyl alcohol polyoxyethylene ether monomer.

4. The method for preparing imidazolyl polyether carbon steel corrosion inhibitor according to claim 2, wherein the molecular weight of the prenyl polyoxyethylene ether is 600, 1200 or 2400.

5. The method of preparing an imidazolyl polyether carbon steel corrosion inhibitor as in claim 2, wherein the base is sodium hydroxide or potassium hydroxide.

6. The method of preparing imidazolyl polyether carbon steel corrosion inhibitors as claimed in claim 2, wherein the purification solvent is acetone.

7. The use of the imidazolyl polyether carbon steel corrosion inhibitor of claim 1 for preventing carbon steel corrosion in acidic environments.

Technical Field

The invention relates to the technical field of carbon steel corrosion inhibitors, in particular to an imidazolyl polyether carbon steel corrosion inhibitor and preparation and application methods thereof.

Background

Due to good mechanical property and heat and electric conductivity, the metal material is widely applied to the building industry, the manufacturing industry and the like. However, while metal materials are responsible for the national economic development, the problems associated with corrosion continue to create various hazards. The harm and loss caused by the corrosion of metal cannot be ignored, and the necessity and importance of the research on metal protection are naturally understood, and the research and the attention of scientific researchers are certainly and always paid to. Researchers have developed many new anticorrosion technologies for the characteristics of metal materials and their environment media, such as a novel anticorrosion material selected for different corrosion environments, a protective layer is formed by coating anticorrosion paint and other substances on the surface of the metal, electrochemical protection (cathodic protection and anodic protection) is adopted, and corrosion inhibitors and the like are added into the corrosion media to effectively relieve the corrosion problems in many industries. Thereby effectively avoiding potential harm, saving capital and energy and ensuring the safe and stable operation of a plurality of production devices.

Corrosion inhibitors, as the name implies, are agents (chemicals or compounds) that effectively mitigate the corrosion of metals, and are generally added to the environmental medium in which the metal is located to protect the metal. The corrosion inhibitor has the advantages of convenient operation, small dosage, quick response, strong adaptability and the like, so the corrosion inhibitor is widely applied to the petrochemical industries of metal smelting, production and processing, chemical cleaning, industrial water, atmospheric environment and the like, and becomes a very effective protective measure in the metal material anticorrosion technology.

At present, carbon steel corrosion inhibitors effective in an acidic medium are generally organic heterocyclic compounds containing nitrogen, sulfur and other atoms or compounds containing P, and most of the corrosion inhibitors have certain toxicity to the environment or are easy to cause water body pollution. In order to inherit the concept of green and environment-friendly sustainable development, the environment-friendly and efficient corrosion inhibitor is developed.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the imidazolyl polyether carbon steel corrosion inhibitor and the preparation and application methods thereof have the advantages of good corrosion inhibition effect, high water solubility and environmental protection.

In order to solve the above technical problems, in a first aspect, an embodiment of the present invention provides an imidazolyl polyether carbon steel corrosion inhibitor, where the structural general formula of the imidazolyl polyether carbon steel corrosion inhibitor is shown in formula (1):

wherein n is an integer of 12. ltoreq. n.ltoreq.52.

In a second aspect, an embodiment of the present invention provides a preparation method of an imidazolyl polyether carbon steel corrosion inhibitor, including the following steps:

step 1, at room temperature, N₂In the environment, adding prenyl alcohol polyoxyethylene ether and alkali into a first reaction container, uniformly mixing, heating to 40-50 ℃, and reacting for 1-3 hours to obtain a mixed solution;

step 2, adding sodium hydroxide and chloroacetic acid into the mixed solution, heating to 70-100 ℃, and reacting for 4-6 hours to obtain a reaction solution; extracting the reaction solution, and carrying out vacuum filtration to obtain a first reactant;

step 3, dissolving the first reactant in water, adjusting the pH to 5-6 with dilute hydrochloric acid, carrying out reduced pressure distillation to remove water, filtering to obtain a second reactant, and drying the second reactant in a vacuum drying oven to obtain a dried substance;

step 4, placing the dried substance and imidazole in a second reaction container, stirring and dissolving at 100-110 ℃, heating to 130-150 ℃, and carrying out stirring reaction to obtain a third reactant;

and 5, purifying the third reactant by using a purification solvent at room temperature to obtain the imidazolyl polyether carbon steel corrosion inhibitor.

As a further improvement of the embodiment of the invention, the mass of the chloroacetic acid is 0.8 times of that of the prenol polyoxyethylene ether and the mass of the imidazole is 1.5 times of that of the prenol polyoxyethylene ether based on the mass of the prenol polyoxyethylene ether monomer.

As a further improvement of an embodiment of the invention, the prenol polyoxyethylene ethers have a molecular weight of 600, 1200 or 2400.

As a further improvement of an embodiment of the invention, the base is sodium hydroxide or potassium hydroxide.

As a further refinement of an embodiment of the present invention, the purification solvent is acetone.

In a third aspect, the embodiment of the invention also provides an application of the imidazolyl polyether carbon steel corrosion inhibitor in carbon steel corrosion prevention in an acidic environment.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects: the imidazolyl polyether carbon steel corrosion inhibitor and the preparation and application methods thereof have the advantages of good corrosion inhibition effect, high water solubility and environmental protection. The imidazolyl carbon steel corrosion inhibitor of the embodiment of the invention contains a plurality of ether groups (-CH) in the molecule₂CH₂A large number of O atoms are favorable for the lone pair electrons to form coordinate bonds with the empty d orbitals of the metal atoms on the surface of the carbon steel, so that the corrosion inhibitor forms an adsorption film with chemical properties on the surface, and the corrosion inhibitor is combined with the adsorption film by chemical bondsThe absorption of acting force is larger than that of physical property, and simultaneously, due to the introduction of the high molecular polymer, molecules are larger, and the diffusivity of the high molecular polymer is increased slowly compared with that of single imidazole or imidazole corrosion inhibitor with smaller molecular weight along with the rise of temperature, so that the high molecular polymer can play a good corrosion inhibition role on carbon steel even under the condition of higher temperature. Containing multiple ether groups (-CH)₂CH₂O-), amide group, hydroxyl group and other hydrophilic groups, can effectively reduce the crystallinity of the high molecular polymer, and the polymer is linear, water molecules easily enter a high molecular structure, and the corrosion inhibitor has certain polarity due to the existence of a large number of ether bonds and amide bonds, so that the corrosion inhibitor has better water solubility. The preparation method of the imidazolyl carbon steel corrosion inhibitor provided by the embodiment of the invention is characterized in that prenyl alcohol polyoxyethylene ether, vinyl chloride and imidazole are used as main raw materials, carboxymethylation reaction is carried out on the hydroxyl chain end of the prenyl alcohol polyoxyethylene ether by using chloroacetic acid to synthesize prenyl alcohol polyoxyethylene ether carboxylic acid, and amidation reaction is carried out on the carboxylic acid chain end of the prenyl alcohol polyoxyethylene ether carboxylic acid by using imidazole to obtain the imidazolyl polyether carbon steel corrosion inhibitor. The three main raw materials are green and environment-friendly materials, and the synthesized imidazolyl polyether carbon steel corrosion inhibitor is non-toxic and environment-friendly.

Drawings

FIG. 1 is a flow chart of a method of making an embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

The embodiment of the invention provides an imidazolyl polyether carbon steel corrosion inhibitor, which has a structural general formula shown in formula (1):

wherein n represents the degree of polymerization of polyethylene oxide, n is an integer, and n is 12. ltoreq. n.ltoreq.52.

The imidazolyl polyether carbon steel corrosion inhibitor of this example contains multiple ether groups (-CH)₂CH₂O-) functional groups, a large number of O atoms favoring their lone pairThe corrosion inhibitor and the empty d orbit of the metal atom on the surface of the carbon steel form a coordination bond, so that the synthesized corrosion inhibitor forms an adsorption film with chemical property on the surface, and the binding of the corrosion inhibitor and the adsorption film by the chemical bond has stronger action force than the adsorption of physical property. Meanwhile, due to the introduction of the high molecular polymer, the molecules are larger, and the diffusivity of the high molecular polymer is increased slowly compared with that of the imidazole corrosion inhibitor alone or the imidazole corrosion inhibitor with smaller molecular weight along with the increase of the temperature, so that the high molecular polymer can play a good corrosion inhibition role on carbon steel even under a higher temperature condition. Because it contains multiple ether groups (-CH)₂CH₂O-), amide groups, hydroxyl groups and other hydrophilic groups, the crystallinity of a high molecular polymer can be effectively reduced, the imidazolyl polyether carbon steel corrosion inhibitor of the embodiment is linear, water molecules easily enter a high molecular structure, the high molecular structure of the embodiment has certain polarity due to the existence of a large number of ether bonds and amido bonds, water is a solvent with larger polarity, and the imidazolyl polyether carbon steel corrosion inhibitor of the embodiment has better water solubility based on a similar compatibility principle. According to the structural general formula of the imidazolyl polyether carbon steel corrosion inhibitor in the embodiment, the imidazolyl polyether carbon steel corrosion inhibitor in the embodiment does not contain S and P, has no toxicity, does not cause water body pollution, and is green and environment-friendly.

The embodiment of the invention also provides a preparation method of the imidazolyl polyether carbon steel corrosion inhibitor, which comprises the following steps of:

step 1, at room temperature, N₂In the environment, adding prenyl alcohol polyoxyethylene ether and alkali into a reaction kettle, uniformly mixing, heating to 40-50 ℃, and reacting for 1-3 hours to obtain a mixed solution;

step 2, adding sodium hydroxide and chloroacetic acid into the mixed solution, heating to 70-100 ℃, and reacting for 4-6 hours to obtain a reaction solution; extracting the reaction solution, and carrying out vacuum filtration to obtain a first reactant;

step 3, dissolving the first reactant in water, adjusting the pH to 5-6 with dilute hydrochloric acid, carrying out reduced pressure distillation to remove water, filtering to obtain a second reactant, and drying the second reactant in a vacuum drying oven to obtain a dried substance;

step 4, placing the dried substance and imidazole in a container, stirring and dissolving at 100-110 ℃, heating to 130-150 ℃, and carrying out stirring reaction to obtain a third reactant;

and 5, purifying the third reactant by using a purification solvent at room temperature to obtain the imidazolyl polyether carbon steel corrosion inhibitor.

In a preferred example, the mass of the chloroacetic acid is 0.8 times that of the prenol polyoxyethylene ether and the mass of the imidazole is 1.5 times that of the prenol polyoxyethylene ether, based on the mass of the prenol polyoxyethylene ether monomer. The mass ratio of the prenyl alcohol polyoxyethylene ether to the chloroacetic acid to the imidazole is 1: 0.8: 1.5 polymerization, and the corrosion inhibitor obtained by polymerization has better corrosion inhibition effect.

Wherein the molecular weight of the prenol polyoxyethylene ether is 600, 1200 or 2400. The alkali is sodium hydroxide or potassium hydroxide. The purification solvent is acetone.

The preparation method of the imidazolyl carbon steel corrosion inhibitor provided by the embodiment of the invention is characterized in that prenyl alcohol polyoxyethylene ether, vinyl chloride and imidazole are used as main raw materials, carboxymethylation reaction is carried out on the hydroxyl chain end of the prenyl alcohol polyoxyethylene ether by using chloroacetic acid to synthesize prenyl alcohol polyoxyethylene ether carboxylic acid, and amidation reaction is carried out on the carboxylic acid chain end of the prenyl alcohol polyoxyethylene ether carboxylic acid by using imidazole to obtain the imidazolyl polyether carbon steel corrosion inhibitor. Compared with the corrosion inhibitor prepared from the monomethyl ether imidazolyl, the corrosion inhibitor prepared from the isopentenol polyoxyethylene ether has good biocompatibility, peptide bonds in a molecular chain are easily and completely degraded by microorganisms to generate carbon dioxide and water, and the corrosion inhibitor is good in environment-friendly corrosion and scale inhibition, good in corrosion inhibition effect and high in water solubility. The imidazole molecular structure contains two meta-position nitrogen atoms, unshared electron pairs of the nitrogen atoms in the imidazole ring participate in cyclic conjugation, the electron density of the nitrogen atoms is reduced, hydrogen on the nitrogen atoms is easy to leave in a hydrogen ion form, and when the imidazole molecular structure reacts with carboxyl-terminated prenol polyoxyethylene ether, one molecule of water is easy to remove, so that the reaction is facilitated, and the imidazole amide derivative is obtained. The three main raw materials are green and environment-friendly materials, and the synthesized imidazolyl polyether carbon steel corrosion inhibitor is non-toxic and environment-friendly. The preparation process has the advantages of low reaction temperature, low energy consumption, simple and convenient operation, high product purity and no need of separation.

The embodiment of the invention also provides an application of the imidazolyl polyether carbon steel corrosion inhibitor in carbon steel corrosion prevention in an acidic environment.

Specific examples are provided below to verify the corrosion inhibition effect and water solubility of the imidazolyl polyether carbon steel corrosion inhibitor of the examples of the present invention.

Example 1:

25℃、N₂under the atmosphere, 12g of prenyl polyoxyethylene ether (molecular weight is 600) and 520mg of sodium hydroxide are added into a three-neck flask and mixed uniformly, and the temperature is increased to 40 ℃ for reaction for 1 h. 520mg of sodium hydroxide and 1.512g of chloroacetic acid were added to the mixed solution, the temperature was raised to 70 ℃ for reaction for 5 hours, the mixture was extracted, and the colored liquid was obtained by vacuum filtration. Dissolving the obtained product in water, adjusting the pH value of the liquid to 5 by using dilute hydrochloric acid, carrying out reduced pressure distillation to remove water, filtering, and drying the product in a vacuum drying oven. The dried product and 2.04g of imidazole were placed in a round bottom flask and dissolved with stirring at 100 ℃ for 30 min. The reaction temperature was then raised to 130 ℃ and the reaction stirred at this temperature overnight to give a brown mixture after the reaction. And purifying with acetone at room temperature to obtain a brown yellow viscous liquid or pasty solid, namely the imidazolyl polyether carbon steel corrosion inhibitor.

Example 2:

25℃、N₂under the atmosphere, 24g of prenyl polyoxyethylene ether (molecular weight is 1200) and 520mg of sodium hydroxide are added into a three-neck flask and mixed evenly, and the temperature is raised to 45 ℃ for reaction for 2 hours. 520mg of sodium hydroxide and 1.512g of chloroacetic acid were added to the mixed solution, the temperature was raised to 85 ℃ for reaction for 5 hours, the mixture was extracted, and the colored liquid was obtained by vacuum filtration. Dissolving the obtained product in water, adjusting the pH value of the liquid to 5 by using dilute hydrochloric acid, carrying out reduced pressure distillation to remove water, filtering, and drying the product in a vacuum drying oven. The dried product and 2.04g of imidazole were placed in a round bottom flask and dissolved with stirring at 100 ℃ for 30 min. The reaction temperature was then raised to 140 ℃ and the reaction stirred at this temperature overnight to give a brown mixture after the reaction. Purifying with acetone at room temperature to obtain brown yellow viscous liquid or pasty solidImidazolyl polyether carbon steel corrosion inhibitors.

Example 3:

25℃、N₂under the atmosphere, 48g of prenyl alcohol polyoxyethylene ether (molecular weight of 2400) and 520mg of sodium hydroxide are added into a three-neck flask and mixed uniformly, and the temperature is raised to 50 ℃ for reaction for 3 hours. 520mg of sodium hydroxide and 1.512g of chloroacetic acid were added to the mixed solution, the temperature was raised to 100 ℃ to react for 5 hours, the mixture was extracted, and the colored liquid was obtained by vacuum filtration. Dissolving the obtained product in water, adjusting the pH value of the liquid to 6 by using dilute hydrochloric acid, carrying out reduced pressure distillation to remove water, filtering, and drying the product in a vacuum drying oven. The dried product and 2.04g of imidazole were placed in a round bottom flask and dissolved with stirring at 110 ℃ for 30 min. The reaction temperature was then raised to 150 ℃ and the reaction stirred at this temperature overnight to give a brown mixture after the reaction. And purifying with acetone at room temperature to obtain a brown yellow viscous liquid or pasty solid, namely the imidazolyl polyether carbon steel corrosion inhibitor.

Comparative example 1

0.04mol of polyethylene glycol monomethyl ether (molecular weight 200) and 0.06mol of imidazole were placed in a round-bottomed flask and dissolved with stirring at 90 ℃ for 30 min. The reaction temperature was then raised to 140 ℃ and the reaction stirred at this temperature overnight to give a brown mixture after the reaction. Purifying with acetone to obtain brown yellow viscous liquid, i.e. imidazolyl polyethylene glycol monomethyl ether corrosion inhibitor.

The corrosion inhibitors obtained in examples 1-3 and comparative example 1 were tested for corrosion inhibition performance under acidic conditions of carbon steel, and the corrosion inhibition performance was tested by a static coupon weight loss method.

The carbon steel test piece used in the weight loss test experiment is a standard I-type A3 carbon steel piece, and the specification of the test piece is 50mm multiplied by 25mm multiplied by 2mm (the surface area is 28 cm)²) The chemical composition (mass fraction) is as follows: 0.17-0.23% of carbon, 0.17-0.37% of silicon, 0.35-0.65% of manganese, 0.25% of chromium, 0.3% of nickel, 0.25% of copper and the balance of iron.

The method comprises the following steps of sequentially cleaning the surface of a carbon steel sheet by acetone and absolute ethyl alcohol to ensure that the surface of the carbon steel sheet is smooth and clean, drying the carbon steel sheet by a blower by cold air, wrapping the carbon steel sheet by filter paper, placing the carbon steel sheet in a dryer, storing for more than 4 hours, and weighing (accurately to 0.0001g) by an analytical balance for later use.

The corrosion medium in the test was a 0.5M HCI solution prepared from 36% concentrated HCl (AR reagent) and high purity water. The volume of the solution in the corrosion test process is 1L, and the solution composition is as follows: 0.5M HCl + corrosion inhibitor.

Carbon steel samples were sequentially immersed into beakers containing 1L of the test solution and statically placed for 72h at a test temperature of 45 ℃. During the test, a certain amount of distillation was added to the beaker every 4h (the night could be suitably extended to 7-8h) to maintain the volume of the test solution at 1 ± 0.05L at all times. After the 72h test was completed, the carbon steel coupons were removed from the test solution, carefully rinsed with ultra-pure water and acetone, dried in air, and accurately weighed (to the nearest 0.0001).

Evaluating the corrosion inhibition performance: after experimental tests, the corrosion rate of the carbon steel sheet and the corrosion inhibition rate of the corrosion inhibitor on the carbon steel sample can be calculated according to the change of the front and back mass of the carbon steel sample and the corrosion inhibition rate calculation formula.

Corrosion rate calculation formula:

V＝10⁶Δm/(A·t)

wherein V is corrosion speed, Delta m is the quality difference of the carbon steel sheet before and after, A is the area of the corrosion coupon, and t is the time of the corrosion test.

The corrosion inhibition rate calculation formula is as follows:

IE％＝(V₀-V/V₀)×100％

wherein IE% is corrosion inhibition rate, V₀The corrosion rate without corrosion inhibition (blank) is shown, and V is the corrosion rate after the corrosion inhibitor is added.

Obtaining a corrosion performance test result: when the concentration of the imidazolyl polyether carbon steel corrosion inhibitor prepared in example 1 reaches 70mg/L, the corrosion inhibition rate is 88.85%. The imidazolyl polyether carbon steel corrosion inhibitor prepared in example 2 has a corrosion inhibition rate of 89.85% when the concentration of the corrosion inhibitor reaches 50 mg/L. The imidazolyl polyether carbon steel corrosion inhibitor prepared in example 3 achieves a corrosion inhibition rate of 90.8% when the concentration of the corrosion inhibitor reaches 50 mg/L. When the concentration of the imidazolyl polyethylene glycol monomethyl ether corrosion inhibitor prepared in the comparative example 1 reaches 300mg/L, the corrosion inhibition rate is 88.85 percent.

The corrosion inhibition rate of the imidazolyl polyether carbon steel corrosion inhibitor prepared by the method is high and is higher than that of the corrosion inhibitor prepared by adopting the monomethyl ether imidazolyl.

The water solubility of the corrosion inhibitors obtained in example 1 and comparative example 1 was tested by the method of GB6234.1-1986 organic chemical product water solubility test in national Standard of the people's republic of China.

50 grams of the imidazolyl polyether carbon steel corrosion inhibitor prepared in example 1 and 30 grams of a certain volume of distilled water were measured and slowly poured into a 100ml dry colorimetric cylinder, and a certain volume of distilled water was measured so that the total volume of the test sample mixed with water was 100ml, and the plug was closed and shaken well. The sample is placed in a thermostatic device with the temperature of 20 +/-1 ℃, the time is recorded simultaneously, after 30 minutes, the colorimetric tube is taken out and placed on a black background together with a colorimetric tube filled with 100ml of water, and simultaneously photometric light is provided to axially observe the sample.

30 g of the imidazolyl polyether carbon steel corrosion inhibitor prepared in example 1 and 30 g of a certain volume of distilled water were measured and slowly poured into a 100ml dry colorimetric cylinder, and a certain volume of distilled water was measured so that the total volume of the test sample mixed with water was 100ml, and the plug was closed and shaken well. The sample is placed in a thermostatic device with the temperature of 20 +/-1 ℃, the time is recorded simultaneously, after 30 minutes, the colorimetric tube is taken out and placed on a black background together with a colorimetric tube filled with 100ml of water, and simultaneously photometric light is provided to axially observe the sample.

50 g of the imidazolyl polyethylene glycol monomethyl ether inhibitor prepared in comparative example 1 and 30 g of distilled water in a certain volume were weighed out and slowly poured into a 100ml dry colorimetric cylinder, and a certain amount of distilled water was weighed out so that the total volume of the test sample mixed with water was 100ml, and the plug was closed and shaken up. The sample is placed in a thermostatic device with the temperature of 20 +/-1 ℃, the time is recorded simultaneously, after 30 minutes, the colorimetric tube is taken out and placed on a black background together with a colorimetric tube filled with 100ml of water, and simultaneously photometric light is provided to axially observe the sample.

Obtaining a water solubility test result: the tests of the imidazolyl polyether carbon steel corrosion inhibitor prepared in the example 1 show that the corrosion inhibitor is clear through axial observation, and the tests of the imidazolyl polyethylene glycol monomethyl ether corrosion inhibitor prepared in the comparative example 1 show that the corrosion inhibitor is turbid through axial observation.

The imidazolyl polyether carbon steel corrosion inhibitor prepared by the method has good water solubility, and is higher than the corrosion inhibitor prepared by adopting the monomethyl ether imidazolyl.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to further illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also intended to be covered by the appended claims. The scope of the invention is defined by the claims and their equivalents.