Multifunctional vapor phase corrosion inhibitor for promoting curing of epoxy coating as well as preparation method and application of multifunctional vapor phase corrosion inhibitor

Abstract

The invention discloses a multifunctional vapor phase corrosion inhibitor for promoting curing of an epoxy coating as well as a preparation method and application thereof, and relates to the field of metal coating protection, the vapor phase corrosion inhibitor comprises the following components in parts by weight: 15-40 parts of a volatile curing accelerator, 10-30 parts of a vapor phase corrosion inhibition main agent, 20-50 parts of a high efficiency water absorbent and 10-30 parts of a carrier. According to the present invention, the product is placed in the closed or semi-closed space (the use amount is 500-200 g / m < 3 >) before coating, such that the three functions can be synchronously achieved: the volatile curing accelerator is released to accelerate the epoxy resin cross-linking, the gas phase corrosion inhibition molecules are released to form the protection film on the metal substrate surface, and the high efficiency water absorbent is adopted to significantly reduce the environmental humidity; the corrosion inhibitor can effectively solve the problems of slow curing and poor adhesive force of an epoxy coating and latent corrosion of a metal substrate in a high-humidity or low-temperature environment, and remarkably improves the quality of the coating and prolongs the protection life of the coating.

Description

Technical Field

[0001] This invention relates to the field of metal coating protection, specifically to a multifunctional vapor phase corrosion inhibitor that promotes the curing of epoxy coatings, its preparation method, and its application. Background Technology

[0002] Epoxy resin coatings are widely used in heavy-duty corrosion protection applications such as shipbuilding, bridges, chemical equipment, and pipelines due to their excellent adhesion, chemical resistance, and mechanical strength. However, the application and curing process of epoxy coatings is highly sensitive to environmental conditions, especially in the following scenarios: 1. High humidity environment: Moisture will compete with epoxy curing agent for a reaction, thereby inhibiting the cross-linking reaction, resulting in whitening, loss of gloss and incomplete curing of the coating, thus greatly reducing its anti-corrosion performance and mechanical strength.

[0003] 2. Low temperature environment: Under low temperature conditions, the molecular activity of epoxy resin and curing agent decreases, the reaction rate slows down sharply, resulting in an excessively long curing cycle or even cessation, which seriously affects construction efficiency.

[0004] 3. Complex internal structures: Traditional heating and dehumidification methods are difficult to implement effectively in enclosed spaces such as cabinets and pipe inner walls. Furthermore, residual moisture in the space and potential flash rust on metal surfaces are the main causes of coating blistering and premature failure.

[0005] Currently, common solutions involve using desiccants or waiting for a suitable weather window, but these methods often lead to project delays. Therefore, there is an urgent need in the field for a multifunctional product that can simultaneously achieve environmental dehumidification, catalytic curing, and prevention of substrate flash rust during the coating curing stage. Summary of the Invention

[0006] The purpose of this invention is to provide a multifunctional vapor phase corrosion inhibitor that can not only effectively prevent metal corrosion, but also significantly promote the curing of epoxy coatings under harsh environments.

[0007] Another object of the present invention is to provide a method for preparing the above-mentioned vapor phase corrosion inhibitor.

[0008] Another object of the present invention is to provide a method for applying the above-mentioned vapor phase corrosion inhibitor in epoxy coating construction.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a multifunctional vapor phase corrosion inhibitor that promotes the curing of epoxy coatings, comprising the following components by weight: Volatile curing accelerator: 15-40 parts, wherein the volatile curing accelerator is an aliphatic or alicyclic amine compound, preferably a small molecule tertiary amine compound, specifically one or a combination of two or more of triethylamine, triethylenediamine, N,N-dimethylethanolamine, N,N-dimethylcyclohexylamine, N,N-dimethylacetamide, and N,N-dimethylbenzylamine in any proportion.

[0010] Vapor phase corrosion inhibitor: 10-30 parts, wherein the vapor phase corrosion inhibitor is a combination of one or more morpholine derivatives; the general formula of the morpholine derivatives is as follows: Wherein R represents a C2-C12 alkyl group; the morpholine derivative is prepared by a Stork enamine synthesis reaction of aliphatic aldehyde compounds and morpholine, wherein the aliphatic aldehyde compounds are any one of substituted or unsubstituted n-butyraldehyde, hexanal, octanal, decanal, undecanoal, dodecanal (also known as lauraldehyde), and tetradecanal (also known as myristaldehyde), and the substituents are selected from C1-C10 alkyl, C1-C10 alkoxy, and C3-C6 cycloalkyl groups.

[0011] High-efficiency water absorbent: 20-50 parts, wherein the high-efficiency water absorbent is one or more of calcium chloride, calcium oxide, sodium polyacrylate, and montmorillonite in any proportion.

[0012] Carrier: 10-30 parts, wherein the carrier is diatomaceous earth, activated alumina or porous polymer microspheres.

[0013] Preferably, the volatile curing accelerator is N,N-dimethylethanolamine, which has both suitable volatility and a significant catalytic effect on the epoxy-amine curing system.

[0014] Preferably, the vapor phase corrosion inhibitor is one or a combination of two or more of (E)-4-(but-1-enyl)morpholine, (E)-4-(oct-1-enyl)morpholine, and (E)-4-(dodecyl)morpholine in any proportion.

[0015] More preferably, the vapor phase corrosion inhibitor is a mixture of (E)-4-(but-1-enyl)morpholine, (E)-4-(oct-1-enyl)morpholine and (E)-4-(dodecyl)morpholine, in a weight ratio of (1-5):(1-5):(1-5).

[0016] Preferably, the high-efficiency absorbent is a mixture of calcium chloride and sodium polyacrylate to achieve a synergistic effect of rapid and deep moisture absorption.

[0017] More preferably, the method for synthesizing the main component of the vapor phase corrosion inhibitor includes the following steps: Step 1: Add the aliphatic aldehyde compound and morpholine to the reaction vessel at a molar ratio of 1:(1.0-1.5), and use an organic solvent as the reaction medium to fully dissolve them.

[0018] Step 2: Slowly add the acidic catalyst and carry out the Stork enamine condensation reaction under an inert gas protection (such as nitrogen or argon) at a constant temperature of 40℃-95℃ for 5-12 hours until the raw materials have completely reacted.

[0019] Step 3: After the reaction is complete, the reaction mixture is cooled to room temperature, and the solvent is removed by rotary evaporator at 35℃-65℃ to obtain the main vapor phase corrosion inhibitor.

[0020] The organic solvent in step 1 is cyclohexane, toluene, n-hexane, petroleum ether, or a mixture thereof.

[0021] In step 2, the acidic catalyst is selected from any one of acetic acid, citric acid, phosphoric acid, or solid superacid.

[0022] The core concept and synergistic mechanism of this invention: 1. In-situ catalytic curing: Volatile curing accelerators (such as tertiary amines) rapidly evaporate after application, filling the entire application space (such as a sealed chamber) and further penetrating into the uncured epoxy coating. As nucleophilic catalysts, small molecule amine compounds can effectively activate epoxy groups, significantly accelerating their ring-opening addition reaction with the epoxy coating curing agent, achieving rapid curing under low temperature or high humidity conditions.

[0023] 2. Active environmental drying: The high-efficiency water absorber can quickly absorb gaseous moisture in the environment, significantly reduce the dew point in the construction microenvironment, avoid side reactions between water molecules and epoxy groups, ensure the dominant role of the curing reaction, and prevent coating whitening and performance degradation.

[0024] 3. Dual rust protection: After evaporation, the vapor phase corrosion inhibitor will adsorb onto the surface of the exposed metal substrate to form a protective film. During the "high-risk period" before and after coating and before the coating is fully cured, it effectively inhibits flash rust caused by humidity on the metal surface and ensures strong adhesion between the coating and the substrate.

[0025] The above synergistic effects work together to create an ideal microenvironment for coating curing that is dry, catalytic, and rust-free.

[0026] Secondly, the present invention provides a method for preparing the above-mentioned multifunctional vapor phase corrosion inhibitor for promoting the curing of epoxy coatings, comprising the following steps: Step 1: Mix the volatile curing accelerator and the vapor phase corrosion inhibitor at room temperature, heat slightly (not exceeding 40°C) and stir until a homogeneous liquid mixture A is formed.

[0027] Step 2: Dry the high-efficiency water absorbent and carrier at 105±5℃ for 1-2 hours to fully activate their water absorption capacity. After drying, mix the two together.

[0028] Step 3: While stirring, slowly and evenly spray the liquid mixture A onto the dry solid mixture obtained in Step 2.

[0029] Step 4: Seal and age the fully adsorbed product for 24-48 hours, then package it into breathable paper bags or non-woven fabric bags to obtain the final product.

[0030] In step 1, the vapor phase corrosion inhibitor is prepared by a Stork enamine synthesis reaction of aliphatic aldehyde compounds and morpholine in a molar ratio of 1:(1.0-1.5); the aliphatic aldehyde compounds are selected from n-butyraldehyde, hexanal, octanal, decanal, undecanoal, dodecaaldehyde, and tetradecaaldehyde.

[0031] Thirdly, this invention provides the application of the aforementioned multifunctional vapor-phase corrosion inhibitor for promoting epoxy coating curing as a curing accelerator in epoxy coating curing. It is suitable for construction in enclosed or semi-enclosed spaces and can improve the curing performance of epoxy coatings under high humidity or low temperature environments. The specific application method in epoxy coating construction is as follows: Before applying the epoxy coating, suspend or place a predetermined amount of the vapor phase corrosion inhibitor product of this invention in the enclosed or semi-enclosed space to be coated (such as ballast tanks of ships, inner walls of pipelines, inside storage tanks, containers, etc.). The recommended dosage is 50-200 g / cubic meter of space. After placing the product in the enclosed space for 2-12 hours, coating application can begin. After the coating is completed, the vapor phase corrosion inhibitor product of this invention can remain in the space until the coating is fully cured.

[0032] The beneficial effects of this invention are: 1. It integrates three functions: vapor phase rust prevention, environmental dehumidification, and catalytic curing, achieving multiple effects with one agent, which simplifies the construction process and reduces the overall cost.

[0033] 2. Overcoming environmental limitations, it makes it possible to apply epoxy coatings under adverse conditions such as high humidity and low temperature, effectively ensuring project progress and coating quality.

[0034] 3. By preventing flash rust and ensuring complete curing, the adhesion, corrosion resistance, and overall performance of epoxy coatings are fundamentally improved.

[0035] 4. Convenient and safe to use. No need to change the existing paint formula. It can work simply by being placed in the construction space. It is especially effective for complex structures and avoids safety risks such as open flames and electricity.

[0036] 5. In a high-humidity environment with a temperature of 15℃ and a relative humidity of 85%, the product of this invention can shorten the surface drying time of epoxy coating by more than 30% and achieve complete curing, while the control group has the problem of poor curing, showing significant effect. Attached Figure Description

[0037] Figure 1 The Fourier transform infrared spectra of compounds A, B, and C prepared in Example 1 of this invention are shown. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0039] Example 1

[0040] A multifunctional vapor phase corrosion inhibitor for promoting the curing of epoxy coatings, by weight (total weight 100 parts), is composed of the following components: 25 parts of volatile curing accelerator (triethylamine), 30 parts of vapor phase corrosion inhibitor (compound A:compound B:compound C = 1:1:1, w / w), 35 parts of high-efficiency water absorbent (calcium chloride 3.5 parts, sodium polyacrylate 31.5 parts), and 10 parts of carrier (diatomaceous earth).

[0041] The specific steps for preparing the above-mentioned multifunctional vapor phase corrosion inhibitor that promotes the curing of epoxy coatings are as follows: (1) Synthesis of the main component of vapor phase corrosion inhibitor: Synthesis of Compound A: 300 mL of cyclohexane was added to a 1000 mL three-necked flask equipped with a mechanical stirrer, thermometer, water separator, and nitrogen inlet tube as the reaction medium. Nitrogen was bubbled through the flask three times to purge air and establish an inert atmosphere. Butyraldehyde (72.1 g, 1.0 mol) and morpholine (104.54 g, 1.2 mol) were weighed and placed in the flask, and stirred until completely dissolved. Glacial acetic acid (8 mL) was slowly added dropwise as a catalyst. Under nitrogen protection, the reaction system was slowly heated to 95 °C and stirred at this temperature for 8 hours. After the reaction was complete, the reaction mixture was cooled to room temperature, and the solvent cyclohexane was removed by rotary evaporation at 50 °C under reduced pressure to obtain the pale yellow liquid product (E)-4-(but-1-enyl)morpholine, abbreviated as Compound A.

[0042] Synthesis of Compound B: 200 mL of cyclohexane was added to a 500 mL three-necked flask as the reaction medium. Octaldehyde (128.2 g, 1.0 mol) and morpholine (105.2 g, 1.2 mol) were weighed and placed in the flask, and stirred until completely dissolved. p-Toluenesulfonic acid (1.5 g) was slowly added as a catalyst. The reaction was carried out at a constant temperature of 90 °C for 10 hours under nitrogen protection. After the reaction was complete, the solvent was removed by rotary evaporation at 50 °C to obtain the pale yellow liquid product (E)-4-(oct-1-enyl)morpholine, abbreviated as Compound B.

[0043] Synthesis of Compound C: A mixed solvent of 200 mL cyclohexane and 50 mL toluene was added to a 500 mL three-necked flask as the reaction medium. Dodecylaldehyde (184.3 g, 1.0 mol) and morpholine (87.6 g, 1.0 mol) were weighed and added to the flask, and stirred until completely dissolved. Acetic acid (5 mL) was slowly added as a catalyst. The reaction was carried out at a constant temperature of 80 °C for 12 hours under nitrogen protection. After the reaction was completed, the solvent was removed by rotary evaporation at 55 °C to obtain the brownish-yellow liquid product (E)-4-(dodecyl-1-enyl)morpholine, abbreviated as compound C.

[0044] Compounds A, B, and C were mixed in a weight ratio of 1:1:1 to prepare the main component of the vapor-phase corrosion inhibitor. Due to the differences in the volatilization rates of the three components (A, B, and C), their corrosion inhibition effects and contributions to the film performance after adsorption on the metal surface also differ. The synergistic effect of the three components can significantly improve the overall corrosion inhibition effect. Specifically, the component with a smaller molecular weight volatilizes faster, preferentially reaching the metal surface and adsorbing, quickly forming an initial protective layer to promptly block the contact between the metal and external corrosive media, providing initial rust prevention. The component with a larger molecular weight volatilizes relatively slower, resulting in a more compact film after adsorption, which can construct a stable and long-lasting protective barrier. Simultaneously, the component with a smaller molecular weight can fill the micropores in the film formed by the component with a larger molecular weight, compensating for the structural defects of the single-component film. Ultimately, through the combination of different molecular weight components and their synergistic effects of different volatilization rates, a composite corrosion inhibitor film with optimal compactness and both rapid and long-lasting protective effects is formed, fully leveraging the advantages of each component and achieving synergistic effects.

[0045] (2) Mix 25 parts of volatile curing accelerator (triethylamine) with 30 parts of vapor phase corrosion inhibitor (compound A: compound B: compound C = 1:1:1, w / w) at room temperature, and heat slightly at no more than 40°C, stirring until a homogeneous liquid mixture A is formed.

[0046] (3) Dry 35 parts of high-efficiency water absorbent (3.5 parts of calcium chloride and 31.5 parts of sodium polyacrylate) and 10 parts of carrier (diatomaceous earth) at 105°C for 2 hours. After drying, mix the two evenly.

[0047] (4) While stirring, the liquid mixture A is slowly and evenly sprayed onto the dry solid mixture of step (3).

[0048] (5) Seal and age the fully adsorbed product for 24 hours, and then package it into breathable paper bags or non-woven bags to obtain corrosion inhibitor product P1.

[0049] Example 2

[0050] A multifunctional vapor phase corrosion inhibitor for promoting the curing of epoxy coatings, by weight (total weight 100 parts), is composed of the following components: 20 parts of volatile curing accelerator (N,N-dimethylethanolamine), 30 parts of vapor phase corrosion inhibitor (compound A:compound B:compound C=1:1:1, w / w), 30 parts of high-efficiency water absorbent (10 parts of calcium chloride, 20 parts of calcium oxide), and 20 parts of carrier (porous polymer microspheres).

[0051] The specific steps for preparing the above-mentioned multifunctional vapor phase corrosion inhibitor that promotes the curing of epoxy coatings are as follows: (1) Synthesis of the main component of vapor phase corrosion inhibitor: Synthesis of Compound A: 300 mL of cyclohexane was added to a 1000 mL three-necked flask equipped with a mechanical stirrer, thermometer, water separator, and nitrogen inlet tube as the reaction medium. Nitrogen was bubbled through the flask three times to purge air and establish an inert atmosphere. Butyraldehyde (72.1 g, 1.0 mol) and morpholine (104.54 g, 1.2 mol) were weighed and placed in the flask, and stirred until completely dissolved. Glacial acetic acid (8 mL) was slowly added dropwise as a catalyst. Under nitrogen protection, the reaction system was slowly heated to 95 °C and stirred at this temperature for 8 hours. After the reaction was complete, the reaction mixture was cooled to room temperature, and the solvent cyclohexane was removed by rotary evaporation at 50 °C under reduced pressure to obtain the pale yellow liquid product (E)-4-(but-1-enyl)morpholine, abbreviated as Compound A.

[0052] Synthesis of Compound B: 200 mL of cyclohexane was added to a 500 mL three-necked flask as the reaction medium. Hexanal (100.16 g, 1.0 mol) and morpholine (105.2 g, 1.2 mol) were weighed and placed in the flask, and stirred until completely dissolved. p-Toluenesulfonic acid (1.5 g) was slowly added as a catalyst. The reaction was carried out at a constant temperature of 90 °C for 10 hours under nitrogen protection. After the reaction was complete, the solvent was removed by rotary evaporation at 50 °C to obtain the pale yellow liquid product (E)-4-(hex-1-enyl)morpholine, abbreviated as compound B.

[0053] Synthesis of Compound C: A mixed solvent of 200 mL cyclohexane and 50 mL toluene was added to a 500 mL three-necked flask as the reaction medium. Dodecylaldehyde (184.3 g, 1.0 mol) and morpholine (95.83 g, 1.1 mol) were weighed and added to the flask, and stirred until completely dissolved. Acetic acid (5 mL) was slowly added as a catalyst. The reaction was carried out at a constant temperature of 80 °C for 10 hours under nitrogen protection. After the reaction was completed, the solvent was removed by rotary evaporation at 55 °C to obtain the brownish-yellow liquid product (E)-4-(dodecyl-1-enyl)morpholine, abbreviated as compound C.

[0054] Compound A, compound B and compound C were mixed in a weight ratio of 1:1:1 to prepare the main component of the vapor phase corrosion inhibitor.

[0055] (2)-(5): The same preparation method and process parameters as in Example 1 are used. The only difference is that the corresponding four substances in steps (2)-(5) of Example 1 are replaced by the corresponding volatile curing accelerator, vapor phase corrosion inhibitor, high-efficiency water absorbent and carrier and weight parts.

[0056] Example 3

[0057] A multifunctional vapor phase corrosion inhibitor for promoting the curing of epoxy coatings, by weight (total weight 100 parts), is composed of the following components: 30 parts of volatile curing accelerator (N,N-dimethylethanolamine), 20 parts of vapor phase corrosion inhibitor (compound A:compound B:compound C=1:2:1, w / w), 35 parts of high-efficiency water absorbent (montmorillonite), and 15 parts of carrier (activated alumina).

[0058] Compounds A, B, and C were prepared according to the method in Example 1, and then mixed in a weight ratio of 1:2:1 to obtain the main component of the vapor phase corrosion inhibitor.

[0059] (2)-(5): The same preparation method and process parameters as in Example 1 are used. The only difference is that the corresponding four substances in steps (2)-(5) of Example 1 are replaced by the corresponding volatile curing accelerator, vapor phase corrosion inhibitor, high-efficiency water absorbent and carrier and weight parts.

[0060] Comparative Example Commercially available desiccants are mainly composed of silica gel.

[0061] Characterization and performance testing: (1) Product characterization: The characteristic peaks of compounds A, B, and C were analyzed by FT-IR spectroscopy, and the results are as follows: Figure 1 As shown. Between 2847 and 2958 cm. -1 Moderate absorption peaks with shoulder-like characteristics were observed within the range, attributed to CH stretching vibrations, indicating the presence of alkyl or methylene structures in all three compounds. Absorption peaks were observed at 1686–1690 cm⁻¹. -1 The absorption peaks appearing within this range are due to the stretching vibrations of the NC=C bond. The peaks are located at 1114-1116 cm⁻¹. -1 A strong absorption peak was observed at 1050-1200 cm⁻¹. -1 The region, with characteristic peaks corresponding to the stretching vibrations of the COC bond, indicates the presence of ether bonds in the molecule. The peaks are located in the 992-998 cm⁻¹ region. -1The absorption peaks appearing within the range correspond to the stretching vibrations of the C=C bond. In summary, the characteristics of these peaks are consistent with the structural characteristics of enamine morpholine derivatives, thus further confirming that the synthesized corrosion inhibitors are all the corresponding enamine morpholine derivatives.

[0062] (2) Test environment: The harsh conditions (15℃, 85%RH) were simulated in a constant temperature and humidity chamber. The dosage was 130g / cubic meter of space.

[0063] (3) Sample preparation: Place the sandblasted steel plate at a depth of 1m 3 The product of Example 1, the comparative product, and the blank control were placed in the experimental chamber.

[0064] (4) Testing process: After 12 hours of pretreatment, the same epoxy primer was sprayed. The surface drying time of the coating was observed. After the coating was cured for 7 days, the coating curing state was tested according to GB / T 23989-2009 (acetone wiping method), the adhesion was tested according to GB / T 9286-2021 (cross-cut test), and the salt spray resistance was tested according to GB / T 10125-2021 (neutral salt spray condition) (test duration 500 hours).

[0065] The test results are shown in the table below:

[0066] Conclusion: In Example 1, the pretreated substrate was rust-free and dry, while the blank group showed slight flash rust, and the comparative group was rust-free but cold and damp. The epoxy coating surface drying time was >5 hours, more than 30% shorter than the blank / comparative group (>8 hours), and it achieved complete curing after 7 days. The adhesion reached grade 0, which was better than grade 2 in the blank group and grade 1 in the comparative group. After 500 hours of salt spray, the scratch corrosion width was <1.5 mm, which was far better than the blank group (>3.0 mm) and the comparative group (2.5 mm). In summary, the product P1 of this invention can effectively prevent flash rust on the substrate under harsh environments and significantly accelerate the curing process of the epoxy coating, ultimately obtaining a coating with excellent adhesion and corrosion resistance, which is far superior to simply using a desiccant.

[0067] The product of this invention is placed in a sealed or semi-sealed space before coating (dosage 50-200g / m²). 3 This product simultaneously performs three major functions: releasing volatile curing accelerators to accelerate epoxy resin crosslinking, releasing vapor-phase corrosion inhibitors to form a protective film on the metal substrate surface, and significantly reducing ambient humidity through a highly efficient water absorbent. This corrosion inhibitor effectively solves the problems of slow curing, poor adhesion, and latent corrosion of metal substrates in high humidity or low temperature environments, significantly improving coating quality and protective lifespan.

Claims

1. A multifunctional gas phase corrosion inhibitor to promote the curing of an epoxy coating, characterized in that, by weight, comprising the following components: volatile curing accelerator 15-40 parts; gaseous phase corrosion inhibitor 10-30 parts; high-efficiency water absorbent 20-50 parts; carrier 10-30 parts; the volatile curing accelerator is an aliphatic or alicyclic amine compound; The gas phase corrosion inhibitor main agent is a combination of one or more than two morpholine derivatives; the general formula of the morpholine derivatives is wherein R represents C2-C12 alkyl; the morpholine derivatives are prepared by Stork enamine synthesis reaction of fatty aldehyde compounds and morpholine.

2. The multifunctional gas phase corrosion inhibitor to facilitate the curing of an epoxy coating according to claim 1, characterized in that, the volatile curing accelerator is one or a combination of more than two of triethylamine, triethylene diamine, N,N-dimethyl ethanolamine, N,N-dimethyl cyclohexylamine, N,N-dimethyl acetamide, N,N-dimethyl benzylamine; the aliphatic aldehyde compound is any one of n-butyl aldehyde, hexyl aldehyde, octyl aldehyde, decyl aldehyde, undecyl aldehyde, dodecyl aldehyde, and the substituent is selected from C1-C10 alkyl, C1-C10 alkoxy, C3-C6 cycloalkyl.

3. The multifunctional gas phase corrosion inhibitor to facilitate the curing of an epoxy coating according to claim 1, wherein, the gaseous phase corrosion inhibitor is one or a combination of more than two of (E)-4-(but-1-enyl)morpholine, (E)-4-(oct-1-enyl)morpholine, and (E)-4-(dodec-1-enyl)morpholine.

4. The multifunctional gas phase corrosion inhibitor to facilitate the curing of an epoxy coating according to claim 3, characterized in that, the gaseous phase corrosion inhibitor is a mixture consisting of (E)-4-(but-1-enyl)morpholine, (E)-4-(oct-1-enyl)morpholine, and (E)-4-(dodec-1-enyl)morpholine, and the weight ratio of the three is (1-5):(1-5):(1-5).

5. The multifunctional gas phase corrosion inhibitor to facilitate the curing of an epoxy coating according to claim 1, wherein, the high-efficiency water absorbent is one or a combination of more than two of calcium chloride, calcium oxide, sodium polyacrylate, and montmorillonite.

6. The multifunctional gas phase corrosion inhibitor to facilitate the curing of an epoxy coating according to claim 1, wherein, the carrier is diatomite, activated alumina, or porous polymer microspheres.

7. A process for the preparation of multifunctional gas phase corrosion inhibitor for the promotion of curing of epoxy coating as claimed in any one of claims 1 to 6, characterized in that, comprising the following steps: Step 1: mixing and stirring the volatile curing accelerator and the gaseous phase corrosion inhibitor to obtain a liquid mixture A; Step 2: drying the high-efficiency water absorbent and the carrier, and then mixing them after drying; Step 3: spraying the liquid mixture A onto the dried solid mixture of Step 2; Step 4: sealing and aging, and then packaging.

8. The preparation method according to claim 7, characterized in that, in Step 1, the gaseous phase corrosion inhibitor is prepared by Stork enamine synthesis reaction of a fatty aldehyde compound and morpholine at a molar ratio of 1:(1.0-1.5) at 40-95°C under the catalysis of an acid catalyst; the fatty aldehyde compound is selected from n-butyl aldehyde, hexyl aldehyde, octyl aldehyde, decyl aldehyde, undecyl aldehyde, and dodecyl aldehyde.

9. Use of the multifunctional gaseous phase corrosion inhibitor for promoting the curing of an epoxy coating as claimed in any one of claims 1-6 to promote the curing of an epoxy coating.

10. Use according to claim 9, characterized in that, The application scenario is an epoxy coating construction environment in a closed or semi-closed space, and the application method is: before the epoxy coating is constructed, the gaseous phase corrosion inhibitor product is placed in the construction space, the amount used is 50-200 g / m3, and the coating is performed after being sealed and pretreated for 2-12 hours.

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