An anticorrosive coating composition, its preparation method and use

Abstract

The present application relates to the technical field of paint, and discloses an anticorrosive paint composition, which comprises component A and component B; the component A comprises the following raw materials: epoxy resin, isosorbide modified polypyridine, sericite powder, talcum powder, dispersing agent, defoaming agent, dimethylbenzene and n-butanol; the component B comprises the following raw materials: phosphate-based curing agent, accelerator DMP-30, dimethylbenzene and n-butanol; the isosorbide modified polypyridine and the phosphate-based curing agent are respectively involved in the preparation process of the component A and the component B of the paint, so that the prepared paint has excellent corrosion resistance, heat resistance and adhesion, significantly prolongs the service life of the coating, plays an excellent protective effect in the field of metal surface protection, and additionally endows the coating with antibacterial ability, so that the coating can meet the use requirements in various environments.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to an anti-corrosion coating composition, its preparation method, and its application. Background Technology

[0002] In recent years, metal corrosion has become a major challenge in the industrial sector, especially in marine engineering, petrochemicals, rail transportation, and equipment manufacturing. Cases of structural failures, safety accidents, and economic losses caused by metal corrosion are alarming. Statistics show that the global economic losses caused by metal corrosion each year far exceed the total losses from natural disasters. Therefore, surface protection of metals has always been a hot research topic. The most direct method for metal surface protection is to apply coating materials. Among the many anti-corrosion coatings, epoxy resin coatings are widely used in the field of metal protection due to their good film-forming properties, formula adjustability, and chemical stability. However, with the development of technology, the requirements for the service life of coatings in high-end equipment, marine engineering, food and pharmaceutical equipment and other fields are constantly increasing, and the limitations of traditional epoxy resin coatings are becoming increasingly prominent.

[0003] Firstly, the adhesion of ordinary epoxy resin coatings needs improvement, and it is prone to decreased adhesion under thermal cycling and mechanical impact, resulting in coating peeling and loss of corrosion protection for metals. Secondly, ordinary epoxy resin coatings have poor heat resistance and are easily oxidized and degraded at high temperatures, also leading to coating lifting or even peeling, thus losing their protective function. Thirdly, ordinary epoxy resin coatings have almost no antibacterial effect. In humid and microbial-rich environments, bacteria and other microorganisms easily grow on the coating surface. Microbial metabolites accelerate coating deterioration and can corrode the metal substrate through tiny cracks in the coating, leading to protective failure and even safety issues. Patent CN117143495B discloses an epoxy resin anti-corrosion coating and its preparation method, resulting in a coating with heat resistance, toughness, and high bonding strength. The coating has few defects, can block corrosive media penetration while maintaining hydrophobicity, and has good anti-corrosion capabilities. However, this patent does not improve the coating's antibacterial properties. On the one hand, microbial growth will affect the long-term anti-corrosion effect of the coating; on the other hand, the lack of antibacterial properties makes it difficult to meet the needs of equipment in fields such as food and medicine. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-corrosion coating composition, its preparation method, and its application, which solves the problems of ordinary coatings having general anti-corrosion ability, adhesion, and heat resistance, affecting coating durability, as well as the problem of not having antibacterial effect, which limits their use in various fields.

[0005] The objective of this invention can be achieved through the following technical solutions: An anti-corrosion coating composition includes component A and component B; component A comprises the following raw materials in parts by weight: 80-100 parts epoxy resin, 15-20 parts isosorbide-modified polypyridine, 8-10 parts sericite powder, 5-6 parts talc powder, 0.5-1 part dispersant, 0.3-0.5 parts defoamer, 80-120 parts xylene, and 35-55 parts n-butanol; component B comprises the following raw materials in parts by weight: 45-55 parts phosphate ester-based curing agent, 1- The mixture comprises 2 parts of accelerator DMP-30, 35-55 parts of xylene, and 10-15 parts of n-butanol; the isosorbide-modified polypyridine is prepared by reacting quaternized polypyridine with isosorbide; the quaternized polypyridine is prepared by reacting poly(4-vinylpyridine) with epichlorohydrin; the phosphate ester-based curing agent is prepared by reacting terminal alkenyl polyethylene glycol phosphate with mercaptoethylamine; the terminal alkenyl polyethylene glycol phosphate is prepared by reacting polyethylene glycol monoallyl ether with vinylphosphonic acid.

[0006] Further, the epoxy resin is E51 type epoxy resin; the dispersant is any one of dispersant BYK-110, dispersant BYK-163, and dispersant BYK-180; and the defoamer is any one of defoamer BYK-066N, defoamer BYK-051, and defoamer BYK-020.

[0007] Furthermore, the preparation method of the isosorbide-modified polypyridine includes the following steps: S1: Poly(4-vinylpyridine) was placed in acetonitrile, epichlorohydrin was added, the mixture was heated to reflux and then cooled to room temperature. After being concentrated by rotary evaporation, the product was dropped into anhydrous ethanol to precipitate. After filtration, the precipitate was washed with diethyl ether 3-5 times and then dried under vacuum to collect the product to obtain quaternized polypyridine. S2: Quaternized polypyridine and isosorbide are placed in N,N-dimethylformamide, mixed thoroughly, nitrogen gas is introduced, a catalyst is added, the temperature is raised to 80-90℃ and reacted for 8-10 hours, concentrated by rotary evaporation, the concentrate is added dropwise to diethyl ether to precipitate, filtered, washed and vacuum dried to obtain isosorbide-modified polypyridine.

[0008] Through the above technical solution, the pyridine group in the poly(4-vinylpyridine) structure undergoes a quaternization reaction with the active chlorine in the epichlorohydrin structure to obtain quaternized polypyridine. Then, under the action of a catalyst, the epoxy group in the quaternized polypyridine structure undergoes a ring-opening reaction with the active hydroxyl group in the isosorbide structure to obtain isosorbide-modified polypyridine. This isosorbide-modified polypyridine structure contains multiple hydroxyl groups, which can participate in the preparation process of the coating, increase the crosslinking density, and effectively improve the adhesion and heat resistance of the coating. The rigid spirocyclic structure of isosorbide in its structure is chemically bonded and encapsulated in the polymer network of the coating, which can further improve the heat resistance of the coating, prevent precipitation, and effectively extend the service life of the coating. At the same time, the polymer network of the coating also contains quaternary ammonium groups, which can exert a long-lasting antibacterial effect, making the prepared coating have excellent antibacterial ability and greatly expanding the application field of the coating.

[0009] Furthermore, in step S1, the reflux reaction time is 8-12 hours.

[0010] Further, in step S2, the catalyst is any one of tetrabutylammonium bromide, tetrabutylammonium chloride, and tetrabutylammonium hydroxide.

[0011] Furthermore, the preparation method of the phosphate ester-based curing agent includes the following steps: SS1: Polyethylene glycol monoallyl ether, vinylphosphonic acid, p-toluenesulfonic acid, and polymerization inhibitor are placed in toluene, a water separator is installed, and the mixture is refluxed for 12-15 hours. After cooling, the mixture is distilled under reduced pressure to collect the product and obtain terminal alkenyl polyethylene glycol phosphate. SS2: Terminal alkenyl polyethylene glycol phosphate and mercaptoethylamine are placed in anhydrous ethanol, nitrogen gas is introduced, benzoin dimethyl ether is added, and the reaction is carried out under ultraviolet light for 1.5-2 hours. The solvent is removed by rotary evaporation and the product is collected to obtain phosphate ester-based curing agent.

[0012] Through the above technical solution, under the catalysis of p-toluenesulfonic acid, the hydroxyl groups in the polyethylene glycol monoallyl ether structure react with the phosphate groups in the vinylphosphonic acid structure to obtain terminal alkenyl polyethylene glycol phosphate. Then, under the action of benzoin dimethyl ether and ultraviolet irradiation, the alkenyl groups in the terminal alkenyl polyethylene glycol phosphate structure undergo a click reaction with the mercaptoethylamine groups in the mercaptoethylamine structure to obtain a phosphate ester-based curing agent. This phosphate ester-based curing agent has amino groups at both ends, which can be used as a curing agent component of coatings. At the same time, its structure contains phosphate ester groups, which can form a passivation film on the metal surface, enhancing the corrosion resistance of the coating. Furthermore, the ether bonds in its structure can effectively enhance the adhesion between the coating and the metal substrate, effectively preventing the coating from peeling off after long-term use. Grafting phosphate ester groups into the polymer chain can effectively prevent phosphate ester migration and loss of anti-corrosion effect during long-term use, thereby extending the service life of the coating.

[0013] Furthermore, in step SS1, the polymerization inhibitor is either p-hydroxyanisole or hydroquinone.

[0014] Furthermore, in step SS2, the irradiance of the ultraviolet light is 5-6 mw / cm². 2 .

[0015] A method for preparing an anti-corrosion coating composition includes the following steps: Step 1: Mix epoxy resin, isosorbide-modified polypyridine, sericite powder, talc powder, dispersant, defoamer, xylene, and n-butanol, and stir at 400-500 rpm for 12-15 minutes until homogeneous to obtain component A. Step 2: Mix the phosphate ester-based curing agent, accelerator DMP-30, xylene, and n-butanol, and stir at 600-700 rpm for 15-20 minutes until homogeneous to obtain component B.

[0016] An anti-corrosion coating composition, which is applied to the field of metal surface protection.

[0017] The beneficial effects of this invention are: This invention involves the preparation of isosorbide-modified polypyridine and phosphate-based curing agents, which are then incorporated into the preparation of components A and B of the coating. This results in a coating with excellent corrosion resistance, heat resistance, and adhesion, significantly extending the service life of the coating. It also provides excellent protection in the field of metal surface protection and additionally endows the coating with antibacterial properties, enabling it to meet the needs of various environments.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a zeta potential diagram of poly(4-vinylpyridine), quaternized polypyridine and isosorbide-modified polypyridine of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The preparation methods of isosorbide-modified polypyridine and phosphate-based curing agents in the following embodiments and comparative examples of the present invention are as follows: I. Preparation of Isosorbide-Modified Polypyridine S1: Place 4g of poly(4-vinylpyridine) in 60ml of acetonitrile, add 4.3g of epichlorohydrin, heat to reflux for 8h, cool to room temperature, concentrate by rotary evaporation, and precipitate by dropping into 200ml of anhydrous ethanol. After filtration, wash the precipitate three times with diethyl ether, and collect the product after vacuum drying to obtain quaternized polypyridine. S2: Place 5g of quaternized polypyridine and 6g of isosorbide in 80ml of N,N-dimethylformamide, mix thoroughly, purge with nitrogen, add 0.3g of tetrabutylammonium bromide, heat to 80℃ and react for 8h, concentrate by rotary evaporation, add the concentrate dropwise to 200ml of diethyl ether to precipitate, filter, wash and vacuum dry to obtain isosorbide-modified polypyridine.

[0023] Zeta potential tests were performed on poly(4-vinylpyridine), quaternized polypyridine, and isosorbide-modified polypyridine, such as... Figure 1As shown, the potential value of poly(4-vinylpyridine) is 0.2 mV, the potential value of quaternized polypyridine is 16 mV, and the potential value of isosorbide-modified polypyridine is 5 mV. It can be seen that poly(4-vinylpyridine) is basically electrically neutral. After quaternization modification, the potential value of the quaternized polypyridine is positive because the quaternary ammonium group in its structure is positively charged. After isosorbide modification, the potential value of the isosorbide-modified polypyridine is greatly reduced because hydroxyl groups are generated to form a hydration layer around the positive charge of quaternary ammonium, producing a charge shielding effect, which reduces the effective surface charge. This indicates that isosorbide was successfully grafted into the polymer chain of quaternized polypyridine.

[0024] II. Preparation of Phosphate Ester-Based Curing Agents SS1: 4.2g polyethylene glycol monoallyl ether, 4g vinylphosphonic acid, 0.2g p-toluenesulfonic acid, and 0.1g p-hydroxyanisole were placed in 80ml of toluene, a water separator was installed, and the mixture was refluxed for 12h. After cooling, the mixture was distilled under reduced pressure to collect the product and obtain terminal alkenyl polyethylene glycol phosphate. SS2: 5.2g of terminal alkenyl polyethylene glycol phosphate and 5g of mercaptoethylamine were placed in 100ml of anhydrous ethanol, nitrogen gas was introduced, and 0.5g of benzoin dimethyl ether was added. The mixture was then subjected to an irradiation of 5mw / cm². 2 The product was reacted under ultraviolet light for 1.5 h, and the solvent was removed by rotary evaporation to collect the product, thus obtaining a phosphate ester-based curing agent.

[0025] The double bond content in terminal alkenyl polyethylene glycol phosphate and phosphate-based curing agent was tested by iodometric titration. 1g of terminal alkenyl polyethylene glycol phosphate and phosphate-based curing agent were taken as samples, and the following methods were used for testing: A 0.1mol / L sodium thiosulfate solution, a 10% potassium iodide solution, and a 1% starch solution were prepared. 25ml of carbon tetrachloride was placed in an iodine flask, and the sample and 8ml of a 0.1mol / L bromine-potassium bromide solution were added. The mixture was shaken well and placed in the dark for 15min. Then, 5ml of potassium iodide solution and 5ml of deionized water were added, and the mixture was stirred thoroughly. Titration was performed using a sodium thiosulfate standard solution. When the solution color changed, 1ml of starch solution was added, and titration continued. The blue color disappeared, and a blank control was performed simultaneously. The double bond content in the sample (mmol / g) was calculated using the following formula: V0 - V)C / 2m; where V0 is the volume of sodium thiosulfate solution consumed in the blank test (ml); V is the volume of sodium thiosulfate solution consumed in the sample titration (ml); C is the concentration of sodium thiosulfate solution (mol / L); and m is the sample mass (g). The calculated double bond content in the terminal alkenyl polyethylene glycol phosphate was 0.52 mmol / g, and the double bond content in the phosphate ester-based curing agent was 0.06 mmol / g. Relatively speaking, the decrease in double bond content in the terminal alkenyl polyethylene glycol phosphate is due to the consumption caused by the click reaction between the alkenyl group in its structure and the thiol group in the mercaptoethylamine structure. Example 1

[0026] Preparation of anti-corrosion coating composition Step 1: Mix 80 parts of E51 type epoxy resin, 15 parts of isosorbide-modified polypyridine, 8 parts of sericite powder, 5 parts of talc powder, 0.5 parts of dispersant BYK-110, 0.3 parts of defoamer BYK-066N, 80 parts of xylene, and 35 parts of n-butanol. Stir at 400 rpm for 12 minutes to obtain component A. Step 2: Mix 45 parts of phosphate ester-based curing agent, 1 part of accelerator DMP-30, 35 parts of xylene, and 10 parts of n-butanol, and stir at 600 rpm for 15 minutes until homogeneous to obtain component B. Example 2

[0027] Preparation of anti-corrosion coating composition Step 1: Mix 90 parts of E51 type epoxy resin, 18 parts of isosorbide-modified polypyridine, 9 parts of sericite powder, 5.5 parts of talc powder, 0.8 parts of dispersant BYK-163, 0.4 parts of defoamer BYK-051, 100 parts of xylene, and 40 parts of n-butanol. Stir at 450 rpm for 14 minutes to obtain component A. Step 2: Mix 50 parts of phosphate ester-based curing agent, 1.5 parts of accelerator DMP-30, 45 parts of xylene, and 12 parts of n-butanol, and stir at 650 rpm for 18 minutes until homogeneous to obtain component B. Example 3

[0028] Preparation of anti-corrosion coating composition Step 1: Mix 100 parts of E51 type epoxy resin, 20 parts of isosorbide-modified polypyridine, 10 parts of sericite powder, 6 parts of talc powder, 1 part of dispersant BYK-180, 0.5 parts of defoamer BYK-020, 120 parts of xylene, and 55 parts of n-butanol. Stir at 500 rpm for 15 minutes to obtain component A. Step 2: Mix 55 parts of phosphate ester-based curing agent, 2 parts of accelerator DMP-30, 55 parts of xylene, and 15 parts of n-butanol, and stir at 700 rpm for 20 minutes until homogeneous to obtain component B.

[0029] Comparative Example 1 Preparation of anti-corrosion coating composition Step 1: Mix 90 parts of E51 type epoxy resin, 9 parts of sericite powder, 5.5 parts of talc powder, 0.8 parts of dispersant BYK-163, 0.4 parts of defoamer BYK-051, 100 parts of xylene, and 40 parts of n-butanol. Stir at 450 rpm for 14 minutes to obtain component A. Step 2: Mix 50 parts of phosphate ester-based curing agent, 1.5 parts of accelerator DMP-30, 45 parts of xylene, and 12 parts of n-butanol, and stir at 650 rpm for 18 minutes until homogeneous to obtain component B.

[0030] Comparative Example 2 Preparation of anti-corrosion coating composition Step 1: Mix 90 parts of E51 type epoxy resin, 18 parts of isosorbide-modified polypyridine, 9 parts of sericite powder, 5.5 parts of talc powder, 0.8 parts of dispersant BYK-163, 0.4 parts of defoamer BYK-051, 100 parts of xylene, and 40 parts of n-butanol. Stir at 450 rpm for 14 minutes to obtain component A. Step 2: Mix 50 parts of polyamide 650, 1.5 parts of accelerator DMP-30, 45 parts of xylene, and 12 parts of n-butanol, and stir at 650 rpm for 18 minutes until homogeneous to obtain component B.

[0031] Comparative Example 3 Preparation of anti-corrosion coating composition Step 1: Mix 90 parts of E51 type epoxy resin, 18 parts of quaternized polypyridine, 9 parts of sericite powder, 5.5 parts of talc powder, 0.8 parts of dispersant BYK-163, 0.4 parts of defoamer BYK-051, 100 parts of xylene, and 40 parts of n-butanol. Stir at 450 rpm for 14 minutes to obtain component A. Step 2: Mix 50 parts of phosphate ester-based curing agent, 1.5 parts of accelerator DMP-30, 45 parts of xylene, and 12 parts of n-butanol, and stir at 650 rpm for 18 minutes until homogeneous to obtain component B.

[0032] Performance testing The anti-corrosion coating compositions prepared in Examples 1-3 and Comparative Examples 1-3 were mixed evenly with component B and applied to steel plates meeting specifications. After curing at 80℃ for 2 hours, the mixtures were used as samples. Adhesion tests were performed on the samples, as well as on samples treated in a 100℃ oven for 24 hours, according to standard GB / T5210-2006, to determine the adhesion and heat resistance. Antibacterial performance tests were performed on the samples according to standard GB / T21866-2008. A 5% neutral salt spray test was conducted on the samples for 1000 hours according to standard GB / T1771-2007, and the surface properties of the samples were observed to determine their corrosion resistance. Specific test results are shown in the table below. Adhesion / MPa Adhesion after heat treatment / MPa Antibacterial rate / % Surface properties Example 1 12.3 10.1 99.8 No blistering, no rust Example 2 13.2 11.4 99.9 No blistering, no rust Example 3 10.1 7.9 99.9 No blistering, no rust Comparative Example 1 5.8 1.9 29.3 Minor bubbling, no rust Comparative Example 2 8.9 6.5 99.6 Blistering, rust Comparative Example 3 7.2 3.7 99.2 No blistering, no rust As shown in the table above, the samples prepared in Examples 1-3 all exhibit excellent heat resistance, adhesion, corrosion resistance, and antibacterial effect. The sample prepared in Comparative Example 1, without the addition of isosorbide-modified polypyridine, showed poor adhesion and heat resistance, and exhibited slight bubbling during the salt spray test, indicating that the lack of a rigid cross-linking structure affected the coating's density. The sample prepared in Comparative Example 2, using a polyamide curing agent, showed a high antibacterial rate, but the bubbling and corrosion phenomena during the salt spray test were severe, indicating that phosphate esters are indispensable for improving the coating's corrosion resistance. The sample prepared in Comparative Example 3, with the direct addition of quaternized polypyridine, allowed the epoxy groups to participate in the curing reaction, and the use of a phosphate ester curing agent, resulting in good corrosion resistance, but only moderate heat resistance, indicating that the rigid spirocyclic ring introduced by isosorbide can effectively enhance the coating's heat resistance. In summary, this invention achieves a unified coating with high adhesion, high temperature resistance, long-term corrosion protection, and antibacterial properties through the synergistic effect of isosorbide-modified polypyridine and phosphate ester-based curing agents.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. An anti-corrosion coating composition, characterized in that, The product comprises component A and component B. Component A includes the following raw materials in parts by weight: 80-100 parts epoxy resin, 15-20 parts isosorbide-modified polypyridine, 8-10 parts sericite powder, 5-6 parts talc powder, 0.5-1 part dispersant, 0.3-0.5 parts defoamer, 80-120 parts xylene, and 35-55 parts n-butanol. Component B includes the following raw materials in parts by weight: 45-55 parts phosphate ester-based curing agent and 1-2 parts accelerator. DMP-30, 35-55 parts xylene, 10-15 parts n-butanol; the isosorbide-modified polypyridine is prepared by reacting quaternized polypyridine with isosorbide; the quaternized polypyridine is prepared by reacting poly(4-vinylpyridine) with epichlorohydrin; the phosphate ester-based curing agent is prepared by reacting terminal alkenyl polyethylene glycol phosphate with mercaptoethylamine; the terminal alkenyl polyethylene glycol phosphate is prepared by reacting polyethylene glycol monoallyl ether with vinylphosphonic acid.

2. The anti-corrosion coating composition according to claim 1, characterized in that, The epoxy resin is E51 type epoxy resin; the dispersant is any one of dispersant BYK-110, dispersant BYK-163, and dispersant BYK-180; the defoamer is any one of defoamer BYK-066N, defoamer BYK-051, and defoamer BYK-020.

3. The anti-corrosion coating composition according to claim 1, characterized in that, The preparation method of the isosorbide-modified polypyridine includes the following steps: S1: Poly(4-vinylpyridine) was placed in acetonitrile, epichlorohydrin was added, the mixture was heated to reflux and then cooled to room temperature. After being concentrated by rotary evaporation, the product was dropped into anhydrous ethanol to precipitate. After filtration, the precipitate was washed with diethyl ether 3-5 times and then dried under vacuum to collect the product to obtain quaternized polypyridine. S2: Quaternized polypyridine and isosorbide are placed in N,N-dimethylformamide, mixed thoroughly, nitrogen gas is introduced, a catalyst is added, the temperature is raised to 80-90℃ and reacted for 8-10 hours, concentrated by rotary evaporation, the concentrate is added dropwise to diethyl ether to precipitate, filtered, washed and vacuum dried to obtain isosorbide-modified polypyridine.

4. The anti-corrosion coating composition according to claim 3, characterized in that, In step S1, the reflux reaction time is 8-12 hours.

5. The anti-corrosion coating composition according to claim 3, characterized in that, In step S2, the catalyst is any one of tetrabutylammonium bromide, tetrabutylammonium chloride, and tetrabutylammonium hydroxide.

6. The anti-corrosion coating composition according to claim 1, characterized in that, The preparation method of the phosphate ester-based curing agent includes the following steps: SS1: Polyethylene glycol monoallyl ether, vinylphosphonic acid, p-toluenesulfonic acid, and polymerization inhibitor are placed in toluene, a water separator is installed, and the mixture is refluxed for 12-15 hours. After cooling, the mixture is distilled under reduced pressure to collect the product and obtain terminal alkenyl polyethylene glycol phosphate. SS2: Terminal alkenyl polyethylene glycol phosphate and mercaptoethylamine are placed in anhydrous ethanol, nitrogen gas is introduced, benzoin dimethyl ether is added, and the reaction is carried out under ultraviolet light for 1.5-2 hours. The solvent is removed by rotary evaporation and the product is collected to obtain phosphate ester-based curing agent.

7. The anti-corrosion coating composition according to claim 6, characterized in that, In step SS1, the polymerization inhibitor is either p-hydroxyanisole or hydroquinone.

8. The anti-corrosion coating composition according to claim 6, characterized in that, In step SS2, the irradiance of the ultraviolet light is 5-6 mw / cm². 2 .

9. The method for preparing an anti-corrosion coating composition as described in claim 1, characterized in that, Includes the following steps: Step 1: Mix epoxy resin, isosorbide-modified polypyridine, sericite powder, talc powder, dispersant, defoamer, xylene, and n-butanol, and stir at 400-500 rpm for 12-15 minutes until homogeneous to obtain component A. Step 2: Mix the phosphate ester-based curing agent, accelerator DMP-30, xylene, and n-butanol, and stir at 600-700 rpm for 15-20 minutes until homogeneous to obtain component B.

10. The anti-corrosion coating composition according to claim 1, characterized in that, The corrosion-resistant coating composition is applied to the field of metal surface protection.

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