Itaconic acid-derived phosphine-free corrosion and scale inhibitor based on mercaptan-ene, and preparation method and application thereof

Abstract

The invention discloses a phosphine-free corrosion and scale inhibitor derived from itaconic acid based on thiol-ene and its preparation method and application. The double bond group on bio-based itaconic acid is utilized and prepared by a one-step method of light-triggered thiol-ene click reaction with polythiol. Various raw materials are abundant and easily available, low in price and non-toxic. The light-triggered preparation process is simple and easy to implement, short in time, high in efficiency, high in yield and low in cost, and suitable for industrial production. The phosphine-free corrosion and scale inhibitor prepared by the present invention reacts with itaconic acid through polythiol, and the molecular structure is clear. After the reaction, itaconic acid becomes substituted succinic acid. Compared with binary or ternary itaconic acid-based polymer scale inhibitors, the molecule is more likely to form a chelate structure with divalent cations, and sulfur atoms can also participate in the chelate ion and have a strong adsorption effect on the metal surface. The scale inhibition rate for calcium carbonate and the corrosion inhibition rate for carbon steel can reach more than 95%. It can be widely used in water treatment of industrial pipelines, oil pipelines, and heating system pipelines.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of new material organic chemicals, and specifically to a thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor, and a preparation method and application thereof, in particular for scale and corrosion inhibition in water treatment with strict environmental protection requirements, such as water treatment using bio-based and phosphine-free corrosion and scale inhibitors. Background Art

[0002] Water resource issues continue to threaten human survival. Among these, the proportion of industrial water use has increased dramatically. For example, for circulating cooling water, boiler water, and oilfield water, these industries are conserving water by extending the operating cycle of their circulation systems and reducing emissions and replenishment. However, this reduction in replenishment water also increases the ion content in the water compared to conventional operations. This intensifies the collision and bonding between ions, leading to the precipitation of low-solubility products from the circulating medium and the formation of scale.

[0003] This scale has a low heat transfer coefficient and adheres to heat transfer surfaces, increasing system energy consumption and operating costs. Even more dangerously, when the scale accumulates on pipe walls and other surfaces, it can easily lead to blockages, threatening system safety. In open systems, dissolved oxygen continuously circulates through the system during operation, coming into contact with metal components and accelerating corrosion. Furthermore, chemicals added for descaling and equipment maintenance often cause secondary corrosion. If corrosion is not controlled, the system is prone to corrosion and pipe penetration. To prevent this adverse situation, the addition of corrosion and scale inhibitors is essential.

[0004] The development of scale inhibitors has evolved through several stages: inorganic polyphosphates, organic phosphonic acids (salts), polycarboxylates, binary and ternary phosphorus-containing copolymers, and binary and ternary phosphorus-free copolymers. From an environmental perspective, phosphorus-free scale inhibitors will be the primary development direction currently and in the future. Inorganic polyphosphate scale inhibitors such as tripolyphosphoric acid and hexametaphosphoric acid are restricted due to phosphorus enrichment in water bodies.

[0005] From the late 1960s to the early 1970s, organic phosphonic acid (salt) and polycarboxylic acid scale inhibitors, such as polyacrylic acid and polymaleic acid, were widely used due to their excellent chemical stability, resistance to hydrolysis, and tolerance to high water temperatures and high alkalinity. They exhibited excellent inhibitory effects against CaCO3 scale, resulting in their widespread use. However, organic phosphonic acid scale inhibitors readily react with calcium ions to form insoluble organic phosphate-calcium ion complexes. Degraded organic phosphate scale inhibitors also react with calcium ions to form calcium phosphate precipitates. In the presence of high calcium ion concentrations, polyacrylic acid also reacts with calcium ions to form insoluble polyacrylic acid-calcium ion complexes. These insoluble complexes and calcium phosphate precipitates not only reduce the inhibitor's effectiveness but also induce the formation of other scales.

[0006] The binary copolymers such as phosphine-based polyacrylic acid, phosphine-based polymaleic acid, acrylic acid / methyl acrylate that appeared in the late 1970s and early 1980s, and the ternary copolymers such as acrylic acid / hydroxypropyl acrylate / methyl acrylate, acrylic acid / acrylamide methylpropane / hypophosphorous acid that appeared in the late 1980s were all developed to block calcium phosphate. This promoted the development of the "organic phosphate (salt)-copolymer" phosphorus-based fully organic formula, but until the early 1990s, phosphorus-based formulas still accounted for a large proportion.

[0007] With increasing environmental awareness and stricter environmental regulations, many countries have begun restricting phosphorus emissions, driving the rapid development of low-phosphorus and phosphorus-free formulations. These have become a hot topic in the development of water treatment agents both domestically and internationally. Biodegradable scale inhibitors, represented by polyepoxy succinic acid (PSA), also known as polyepoxy maleic acid, are rapidly gaining popularity. These inhibitors are prepared by converting maleic anhydride into PSA, which is then polymerized in the presence of calcium hydroxide to form PSA. This method produces PSA with a specific molecular weight and molecular weight distribution, making it widely used as a scale inhibitor for water. However, the process is complex and the reaction is difficult to control, making it unsuitable for industrial production.

[0008] Itaconic acid is a typical bio-based dicarboxylic acid. Due to the presence of two carboxylic acid groups in its molecule, the chemical properties of its double bond that can undergo free radical polymerization, and its readily biodegradable nature, various itaconic acid copolymer scale inhibitors have been synthesized, and the scale inhibition and dispersion mechanisms of these copolymers have been explored. The results showed that copolymers obtained by polymerizing itaconic acid monomers with other monomers exhibit significantly better scale inhibition and dispersion properties than itaconic acid homopolymers. Researchers also compared the performance of polymers obtained by copolymerizing itaconic acid molecules with various monomers and commercially available water treatment agents, concluding that itaconic acid copolymers exhibit superior performance. Furthermore, the synthesized itaconic acid copolymers are more biodegradable than other water treatment agents and are more environmentally friendly. The introduction of multiple monomers (groups) into copolymers has laid a solid foundation for future research on itaconic acid-based water treatment agents.

[0009] Because itaconic acid is easy to get and moderately priced, this makes it become the focus of water treatment agent direction research. Although itaconic acid water treatment agent has excellent performance, it is still in the experimental research stage and has not been widely used in industry. As disclosed in CN103011427B, the high-efficiency low-phosphorus water treatment agent and preparation method thereof, the method adopts itaconic acid as the high-efficiency low-phosphorus water treatment agent of main agent, reduces the consumption of maleic anhydride in poly-horse products, and replaces the high sodium hypophosphite of cost with sodium phosphite. However, the method raw materials are many, and the preparation process is complicated and difficult to control, and cost is high, and still phosphorus-containing. Therefore, in the follow-up research process of itaconic acid water treatment agent, should strive to realize in process, streamline raw materials, energy conservation and environmental protection, cost control, can have bigger breakthrough, make environmentally friendly water treatment agent be widely applied in industrial production as early as possible, this is most important to the sustainable development of water resources and environmental protection. Summary of the Invention

[0010] The present invention proposes a thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor, its preparation method, and application. This method utilizes the double bond of itaconic acid to react with a polythiol compound via photoinitiation to achieve a thiol-ene click chemistry step, resulting in a one-step preparation of the phosphine-free corrosion and scale inhibitor. This breakthrough in conventional processes significantly reduces costs, offers high yields, is free of byproducts, and is energy-efficient and environmentally friendly, making it highly suitable for industrial production. Furthermore, the prepared compound exhibits excellent chelating properties and has promising application prospects in water treatment, particularly for corrosion and scale inhibition.

[0011] In order to achieve the above object, the technical solution of the present invention is as follows:

[0012] In the first aspect, the present invention proposes a method for preparing a thiol-ene based itaconic acid-derived phosphine-free corrosion and scale inhibitor, which uses itaconic acid containing a double bond and two carboxyl groups and a polythiol compound as raw materials and is prepared in a one-step method through a photo-triggered thiol-ene click reaction.

[0013] Furthermore, the structure of itaconic acid containing a double bond and two carboxyl groups is shown in Formula A below:

[0014]

[0015] Furthermore, the polythiol compound is trithiol or tetrathiol, and the structures are shown in the following formulas B1 to B6:

[0016]

[0017] Furthermore, the preparation method of the above-mentioned thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor comprises the following steps:

[0018] S1. Dissolving itaconic acid containing a double bond and two carboxyl groups and a polythiol compound containing n thiols in an organic solvent at a molar equivalent ratio of n:1, ensuring that the molar equivalents of the thiols and the double bonds are the same;

[0019] S2, add 0.3-2% of the total mass of the raw materials as a photoinitiator, irradiate the system with a light source for 8-20 minutes while stirring under the protection of inert gas, and monitor the mercaptan at 2570cm -1 The absorption peak at disappears and the reaction ends;

[0020] S3. The organic solvent is distilled off without further purification to prepare the thiol-ene based itaconic acid-derived phosphine-free corrosion and scale inhibitor.

[0021] Furthermore, in step S1, the organic solvent is a low-boiling-point organic solvent including but not limited to ethanol, acetone, and tetrahydrofuran.

[0022] Furthermore, in step S2, the photoinitiator is a commercial photoinitiator including but not limited to 1173, 184, and TPO.

[0023] Furthermore, in step S2, the inert gas is nitrogen or argon, preferably nitrogen.

[0024] Furthermore, the light source is an LED light source with an emission wavelength of 365nm-395nm, and the light intensity of the light source is 50mW / cm 2 ~500mW / cm 2 .

[0025] In a second aspect, the present invention also proposes a thiol-ene based itaconic acid derived phosphine-free corrosion and scale inhibitor, which is prepared by any of the above methods. The prepared multifunctional itaconic acid derived phosphine-free corrosion and scale inhibitor contains multiple carboxyl groups.

[0026] In a third aspect, the present invention further proposes the use of the above-mentioned thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor as a water treatment agent.

[0027] Compared with the prior art, the technical effects of the present invention are:

[0028] 1. The preparation method of the thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor proposed in the present invention utilizes the double bond groups on bio-based itaconic acid and polythiol to prepare it in a one-step process through a photo-initiated thiol-ene click reaction. Various raw materials are abundant and easily available, low in price, and non-toxic. The photo-initiated preparation process is simple and easy to implement, short in time, high in efficiency, high in yield, and low in cost, and is suitable for industrial production.

[0029] 2. The thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor prepared by the present invention has a clear molecular structure through the reaction of polythiol with itaconic acid. After the reaction, itaconic acid is converted into substituted succinic acid. Compared with binary or ternary itaconic acid-based polymer scale inhibitors, the molecule more easily forms a chelate structure with divalent cations, and the sulfur atom can also participate in the chelation of ions and form a strong adsorption effect on metal surfaces. Based on application results, it has excellent scale inhibition performance against calcium carbonate and good corrosion inhibition performance against carbon steel. At an operating concentration of 16 ppm, the scale inhibition rate for calcium carbonate and the corrosion inhibition rate for carbon steel both reach over 95%. It can be widely used as a treatment agent for water treatment in industrial pipelines, oil pipelines, and heating system pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FT-IR spectrum of the phosphine-free corrosion and scale inhibitor product B1-A prepared in Example 1;

[0031] Figure 2 The phosphine-free corrosion and scale inhibitor product B1-A prepared in Example 1 is dissolved in d6-DMSO. 1 H NMR spectrum;

[0032] Figure 3 This is the reaction process of preparing the phosphine-free corrosion and scale inhibitor B3-A by using the thiol-ene click reaction in Example 7;

[0033] Figure 4 The relationship between the scale inhibition rate and concentration of B1-A and B3-A for calcium carbonate provided in Example 8;

[0034] Figure 5 The relationship between the corrosion inhibition rate and concentration of B1-A and B3-A for carbon steel provided in Example 8. DETAILED DESCRIPTION

[0035] To help those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0036] The experimental methods in the following examples are conventional methods unless otherwise specified.

[0037] Unless otherwise specified, the test materials used in the following examples were purchased from conventional biochemical reagent stores or were simply prepared by known synthetic methods.

[0038] The invention provides a method for preparing a thiol-ene based itaconic acid-derived phosphine-free corrosion and scale inhibitor, which uses itaconic acid containing a double bond and two carboxyl groups and a polythiol compound as raw materials and is prepared in a one-step method through a photo-triggered thiol-ene click reaction.

[0039] The structure of itaconic acid containing a double bond and two carboxyl groups is shown in Formula A below:

[0040]

[0041] The polythiol compound is trithiol or tetrathiol, and the structures are shown in the following formulas B1 to B6:

[0042]

[0043] The individual representative molecular structures prepared by the present invention are as follows:

[0044]

[0045] Example 1

[0046] The phosphine-free corrosion and scale inhibitor B1-A was prepared by a one-step photoinitiated thiol-ene process as follows:

[0047] Tetrakis(3-mercaptopropionic acid) pentaerythritol ester (4.88 g, 10 mmol), itaconic acid (5.20 g, 40 mmol) and 50 g of anhydrous ethanol were added to a three-necked flask in sequence, and then 0.25 g of 1-hydroxycyclohexylphenyl ketone (photoinitiator 184) was added. Under nitrogen protection, electromagnetic stirring was carried out while using a 385 nm LED light source (light intensity 100 mW / cm 2 After irradiation for 20 minutes, the infrared spectrum of the sample was tested and it was found that 2570 cm -1 The absorption peak of -SH disappears, indicating that the reaction is complete. Most of the ethanol is evaporated to obtain a colorless viscous product.

[0048] Specific FT-IR spectra and 1 H NMR spectrum see Figure 1 and Figure 2 .

[0049] like Figure 1 As shown in the FT-IR infrared spectrum, 3000-3500 cm -1 The typical absorption peak of carboxylic acid is at 1720 cm -1 The typical carbonyl peak is at 2570 cm -1 The thiol peak completely disappeared, preliminarily proving that the reaction was completed.

[0050] like Figure 2 As shown, in 1The H NMR spectrum shows water peaks at 2.51 ppm and 3.37 ppm for d6-DMSO, along with typical absorption peaks for residual ethanol. A proton peak at 12.36 ppm indicates a carboxylic acid, while multiple peaks between 2.61 and 2.82 ppm are absorption peaks for CH2 in the molecular structure. Due to overlapping peaks and the product's low solubility in d6-DMSO, peak attribution is difficult. However, the proton peaks for the itaconic acid double bond at 5.26 ppm and 5.76 ppm have almost completely disappeared. Combined with the disappearance of the thiol absorption peak in the infrared spectrum, this strongly suggests a successful reaction, with a very high yield of the thiol-ene reaction. Figure 2 The hydrogen at 7-8 ppm belongs to the proton on the benzene ring and comes from the decomposition product of photoinitiator 184.

[0051] Example 2

[0052] Phosphine-free corrosion and scale inhibitor B1-A was prepared by changing the photoinitiator content as follows:

[0053] The amounts of the two raw materials and ethanol were identical to those in Example 1, except for the amount of photoinitiator, which was changed to 0.50 g. The light source remained unchanged, and the reaction was found to be complete after 10 minutes of illumination. The temperature of the reaction system was raised from room temperature to 32°C, and the ethanol was evaporated to dryness to obtain a quantitative product.

[0054] Example 3

[0055] Phosphine-free corrosion and scale inhibitor B1-A was prepared by changing the type of photoinitiator as follows:

[0056] The amounts of the two raw materials and ethanol were identical to those in Example 1. The photoinitiator was changed from 184 to 1173 (2-hydroxy-2-methylphenylpropane-1-one), with a specific mass of 0.50 g. The light source remained unchanged, and it was found that the reaction was completely complete after 10 minutes of illumination. The temperature of the reaction system was raised from room temperature to 31°C, and the ethanol was evaporated to obtain a quantitative product.

[0057] Example 4

[0058] The method for preparing phosphine-free corrosion and scale inhibitor B1-A by changing the light intensity of the light source is as follows:

[0059] The specific method is the same as in Example 1, except that the light intensity of the light source is changed to 500 mW / cm 2 It was found that the reaction could be completed in 8 minutes, and a quantitative product was obtained after evaporating the ethanol.

[0060] Example 5

[0061] The phosphine-free corrosion and scale inhibitor B1-A was prepared using a high-intensity light source as follows:

[0062] The specific method is the same as in Example 1, except that the light intensity of the light source is changed to 1000 mW / cm 2 It was found that the thiol could not react completely, and itaconic acid partially self-polymerized, and the target product could not be obtained. Therefore, the light intensity should be controlled at 500mW / cm 2 the following.

[0063] Example 6

[0064] The phosphine-free corrosion and scale inhibitor B1-A was prepared by changing the emission wavelength of the light source as follows:

[0065] The specific method is the same as that of Example 1, except that the light source is changed to an LED light source with an emission wavelength of 365 nm and a light intensity of 50 mW / cm 2 It was found that the reaction could be completed in 10 minutes and the product was quantitatively obtained.

[0066] Example 7

[0067] The phosphine-free corrosion and scale inhibitor B3-A was prepared by mercaptan-ene click reaction. Figure 3 As shown, the method is as follows:

[0068] The preparation process for the phosphine-free corrosion and scale inhibitor B3-A is identical to that for B1-A, except that the amount of itaconic acid added is 3 equivalents of trimethylolpropane tris(3-mercaptopropionate). The reaction is complete after 15 minutes of illumination. After distilling off the ethanol, a quantitative product is obtained, demonstrating the advantage of the click reaction's nearly 100% conversion.

[0069] Example 8

[0070] Determination of scale and corrosion inhibition performance

[0071] The phosphine-free corrosion and scale inhibitors B1-A and B3-A prepared in Example 1 and Example 7 were tested for scale inhibition and corrosion inhibition properties according to GB / T 16632-2008 "Determination of scale inhibition performance of water treatment agents - Calcium carbonate precipitation method" and GB / T 18175-2000 "Determination of corrosion inhibition performance of water treatment agents - Rotating coupon method", respectively.

[0072] The calculation formula for scale inhibition performance η (%) is:

[0073]

[0074] (1) Where ρ4 is the mass concentration of calcium ions in the test solution after the water treatment agent is added, in mg / mL; ρ3 is the mass concentration of calcium ions in the blank test solution after the water treatment agent is added, in mg / mL; 0.240 is the mass concentration of calcium ions in the test solution prepared before the test, in mg / mL.

[0075] The calculation formula for A3 carbon steel corrosion rate X1 (mm / a) is:

[0076]

[0077] (2) Where m is the mass loss of the test piece, in g; m0 is the average mass loss of the test piece in the blank test of pickling, in g; s is the surface area of ​​the test piece, in cm 2 ; ρ is the density of the test piece, in g / cm 3 ; t is the test time, unit is h; 8760 is the number of hours equivalent to one year (1a), unit is h / a; 10 is the number of millimeters equivalent to 1 cm, unit is mm / cm.

[0078] The calculation formula of corrosion inhibition rate X (%) is:

[0079]

[0080] (3) Where X0 is the corrosion rate of the blank test specimen (calculated using the same method as in (2)), in mm / a; X1 is the corrosion rate of the test specimen with the water treatment agent added, in mm / a.

[0081] The scale inhibition performance of the two phosphine-free scale and corrosion inhibitors B1-A and B3-A prepared by the present invention is as follows: Figure 4 As shown in the figure. From the molecular structure, B1-A contains eight carboxyl groups and is derived from itaconic acid, which can form a chelate with calcium ions. Figure 4 As shown, B1-A exhibits slightly higher scale inhibition than B3-A at the same concentration, particularly at 4-14 mg / L. For example, at 4 mg / L, the inhibition rates are 53.2% and 49.5%, respectively. As the amount of scale inhibitor increases, the inhibition rates of both compounds continue to increase, reaching 97.2% and 92.4%, respectively, at 14 mg / L. However, the upward trend begins to weaken. Specifically, B1-A exhibits slightly better scale inhibition than B3-A at low concentrations, but performance is similar at high concentrations. This may be due to the presence of sulfur atoms in the molecular structure, which can chelate calcium ions simultaneously with the carboxylic acid. This allows the two molecules to form complexes with metal ions in water, reducing the formation of calcium carbonate. At appropriate concentrations, both exhibit scale inhibition rates exceeding 97%.

[0082] The corrosion inhibition performance of the two phosphine-free scale and corrosion inhibitors B1-A and B3-A prepared by the present invention is as follows: Figure 5 As shown. The corrosion inhibition performance of carbon steel was evaluated based on the degree of corrosion of carbon steel by performing a rotating coupon corrosion test. Figure 5The corrosion inhibition effect of B1-A and B3-A can be found. When the concentration of B1-A and B3-A is 4 mg / L, the corrosion inhibition efficiency of the two is 68.5% and 65.3%, respectively, showing good corrosion inhibition performance. As their amount gradually increases, their corrosion inhibition performance continues to improve. When the addition amount reaches 12 mg / L, the corrosion inhibition rates of the two reach 94.5% and 90.6%, respectively. When the concentration continues to increase, for example 18 mg / L, the corrosion inhibition rates of the two reach 98.7% and 97.5%, respectively, both showing high efficiency. This shows that the molecular structure of the polycarboxylic acid corrosion inhibitor prepared by the thiol-ene synthesis method, in which the sulfur atoms have a strong adsorption capacity with Fe, will be enriched on the metal surface to form a dense protective layer to prevent metal corrosion.

[0083] The test data above demonstrates that the phosphine-free scale and corrosion inhibitor prepared by this invention exhibits excellent scale inhibition and corrosion inhibition performance against calcium carbonate scale. It can be used in high-calcium, high-chloride, and high-concentration conditions. It has great potential for application in low-pressure boiler water and circulating cooling water systems in industries such as power, steel, and oil fields.

[0084] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A method for preparing a phosphine-free corrosion and scale inhibitor derived from itaconic acid based on thiol-ene, characterized in that: The method is prepared by a one-step photoinduced thiol-ene click reaction using itaconic acid containing a double bond and two carboxyl groups and a polythiol compound as raw materials. The polythiol compound is a trithiol or a tetrathiol, and the structures are shown in the following formulas B1 to B6:

2. The method for preparing the thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor according to claim 1, characterized in that: The structure of itaconic acid containing a double bond and two carboxyl groups is shown in Formula A below:

3. The method for preparing the thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor according to claim 1, characterized in that: The following steps are involved: S1, dissolving itaconic acid containing a double bond and two carboxyl groups and a polythiol compound containing n thiols in an organic solvent at a molar equivalent ratio of n:1; S2, add 0.3-2% of the total mass of the raw materials as a photoinitiator, irradiate the system with a light source for 8-20 minutes while stirring under the protection of inert gas, and monitor the mercaptan at 2570cm -1 The absorption peak at disappears and the reaction ends; S3. Distilling off the organic solvent to prepare the thiol-ene based itaconic acid-derived phosphine-free corrosion and scale inhibitor.

4. The method for preparing the thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor according to claim 3, characterized in that: In step S1, the organic solvent is a low-boiling-point organic solvent including but not limited to ethanol, acetone, and tetrahydrofuran.

5. The method for preparing the thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor according to claim 3, characterized in that: In step S2, the photoinitiator is a commercial photoinitiator including but not limited to 1173, 184, and TPO.

6. The method for preparing the thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor according to claim 3, characterized in that: In step S2, the inert gas is nitrogen or argon.

7. The method for preparing the thiol-ene-based itaconic acid-derived phosphine-free corrosion and scale inhibitor according to claim 3, characterized in that: The light source is an LED light source with an emission wavelength of 365nm-395nm and a light intensity of 50mW / cm 2 ~500mW / cm 2 .

8. A phosphine-free itaconic acid-derived corrosion and scale inhibitor based on thiol-ene, characterized in that: The method according to any one of claims 1 to 7 is used for preparation.

9. Use of the thiol-ene based itaconic acid derived phosphine-free corrosion and scale inhibitor according to claim 8 as a water treatment agent.

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