Microcapsule modification method and thermal insulation metal anticorrosive coating

Abstract

This invention relates to a microcapsule modification method based on photocuring and a thermally insulating and corrosion-resistant metal coating prepared based on the microcapsules, belonging to the field of coatings. The microcapsule surface modification method of this invention completes the modification step and microcapsule preparation in one step, simplifying the process; the dispersibility of the modified microcapsules in the resin system is significantly improved. Based on the modification method of this invention, surface-modified microcapsules loaded with corrosion inhibitors and phase transition agents were successfully prepared, effectively improving the performance of the coating. Metal coatings with added bifunctional microcapsules retain their basic properties largely unaffected and exhibit excellent corrosion resistance. Simultaneously, the coating generates a thermal buffering effect, delaying the thermal response and demonstrating effective temperature regulation capabilities, reducing energy consumption, and showing broad application prospects.

Description

Technical Field

[0001] This invention relates to a thermal insulation and anti-corrosion coating for metals, belonging to the field of coatings. Background Technology

[0002] Metallic materials are widely used in the manufacture of buildings and transportation vehicles, and are characterized by high thermal conductivity and susceptibility to corrosion. Currently, coatings remain one of the most commonly used and effective techniques for metal corrosion protection. Traditional coatings form a physical barrier, isolating the metal surface from the external environment and thus inhibiting the migration of corrosive media to the metal surface; however, this protective effect is limited. Some new functional coatings incorporate corrosion inhibitors and other functional substances to enhance their anti-corrosion effect and extend the service life of the metal. With the rapid development of microencapsulation technology, adding microencapsulated functional substances to coating systems can achieve even better results. Adding microcapsules loaded with metal corrosion inhibitors (such as benzotriazole (BTA), 2-mercaptobenzothiazole (MBT), and 8-hydroxyquinoline (8-HQ)) to the coating allows the inhibitor to be released and migrate to the target area when defects or corrosion reactions occur, restoring the coating's physical shielding properties or acting as a corrosion inhibitor and passivator.

[0003] Energy conservation and emission reduction are major global issues, with increasingly stringent requirements across industries. However, due to the high thermal conductivity of metals, significant energy waste occurs during use through heat transfer. Thermal insulation is a crucial measure for reducing energy consumption. Therefore, imbuing metal anti-corrosion coatings with thermal insulation properties is of great significance. Adding phase change materials (PCMs) to metal coatings is an effective way to improve their thermal insulation performance; however, the effectiveness is directly related to the amount of PCM added. Current technologies cannot provide a highly effective solution due to the limited dispersibility of microcapsules in coatings. Currently, to improve the dispersibility of microcapsules in coating systems and better impart functionality to the coating, the common method is to modify the microcapsule shell. Adding shell-modified bifunctional microcapsules to coating systems would greatly expand the application areas of functional coatings, but existing modification methods are complex.

[0004] Therefore, it is essential to develop a simple microcapsule modification method; at the same time, it is of great practical significance to prepare a metal coating with heat insulation and effective corrosion protection based on this method. Summary of the Invention

[0005] This invention aims to provide a novel thermal insulation and anti-corrosion coating for metals, overcoming the aforementioned problems of traditional coatings. By encapsulating a phase change material while loading a corrosion inhibitor, a bifunctional microcapsule is obtained. Adding this microcapsule as a filler to the coating system provides both corrosion protection and thermal insulation. Furthermore, the microcapsules are modified during preparation; thus, while providing corrosion protection to the metal substrate, a good thermal insulation and anti-corrosion effect is achieved. This achieves both metal corrosion protection and energy conservation and emission reduction goals.

[0006] Technical solution: To achieve the above objectives, the technical solution adopted by this invention is as follows:

[0007] The first aspect of the present invention is to provide a photocuring-based microcapsule modification method, wherein the microcapsule comprises a core material and a shell material, the shell material encapsulating the core material; the shell material is prepared by photocuring a modified substance and a photosensitive prepolymer; the modified substance comprises an oil-soluble modified substance and a water-soluble modified substance;

[0008] The modification method includes the following steps:

[0009] Modification Method 1:

[0010] S11: The organic solvent, core material, photosensitive prepolymer, oil-soluble modifier and photoinitiator are mixed to form the oil phase, and the emulsifier aqueous dispersion is formed to form the aqueous phase; the oil phase and the aqueous phase are mixed and emulsified to obtain an emulsion;

[0011] S12: After the organic solvent evaporates, the modified microcapsules are obtained by curing them under a light source;

[0012] Alternatively, modification method two:

[0013] S21: The organic solvent, core material, photosensitive prepolymer and photoinitiator are mixed and used as the oil phase, and the emulsifier aqueous dispersion is used as the aqueous phase; the oil phase and the aqueous phase are mixed and emulsified to obtain an emulsion;

[0014] S22: After the organic solvent evaporates, water-soluble modifying material is added, mixed well, and then cured under a light source to obtain modified microcapsules;

[0015] Or, modification method three:

[0016] S31: The organic solvent, core material, photosensitive prepolymer, oil-soluble modifier and photoinitiator are mixed and used as the oil phase, and the emulsifier aqueous dispersion is used as the aqueous phase; the oil phase and aqueous phase are mixed and emulsified to obtain an emulsion;

[0017] S32: After the organic solvent evaporates, water-soluble modifying material is added, mixed well, and then cured under a light source to obtain modified microcapsules.

[0018] Further, in step S11, step S21, or step S31, the emulsifier concentration is 0.5wt%-2.0wt%.

[0019] Furthermore, in step S11, step S21, or step S31, the volume ratio of the oil phase to the water phase is 1:8 to 1:12.

[0020] In one embodiment, emulsification is performed using a cell disruptor for 10-20 minutes.

[0021] Furthermore, the emulsifier is selected from one of polyvinyl alcohol, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, and hexadecyltrimethylammonium bromide.

[0022] Furthermore, in step S12, step S22, or step S32, the solvent is evaporated by mechanical stirring;

[0023] Furthermore, in step S12, step S22, or step S32, the photocuring time is 1-15 min.

[0024] In one embodiment, in step S12, step S22, or step S32, the solvent evaporation temperature is 20-60°C, and the stirring time is 2-10 hours.

[0025] In one embodiment, the oil-soluble modifier is selected from one or more of glycidyl methacrylate and 2-mercaptobenzothiazole;

[0026] In one embodiment, the water-soluble modifying material is selected from one or more of mercaptoethylamine and polyazidepropane;

[0027] Furthermore, the photosensitive prepolymer is one of polyurethane acrylate, polyester acrylate, and epoxy acrylate.

[0028] In one embodiment, the photosensitive prepolymer is selected from one or a combination of polyurethane acrylate, polyester acrylate and epoxy acrylate.

[0029] Furthermore, the photoinitiator is selected from one of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone, and 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone.

[0030] Furthermore, in step S12, step S22, or step S32, the wavelength of the light source used for photocuring is 230-420nm.

[0031] In one embodiment, the oil phase comprises, by mass fraction: 35-65 parts organic solvent, 15-25 parts photosensitive prepolymer, 15-25 parts core material, and 1-4 parts photoinitiator.

[0032] In one embodiment, the organic solvent is selected from one or a combination of dichloromethane, trichloromethane, ethyl acetate, and toluene;

[0033] In one embodiment, the amount of the oil-soluble modifier added is 2.5 wt% to 12.5 wt% of the photosensitive prepolymer;

[0034] In one embodiment, the amount of the water-soluble modifier added is 7.5 wt% to 17.5 wt% of the photosensitive prepolymer.

[0035] A second aspect of the present invention is to provide a modified microcapsule prepared by the above-described modification method, wherein the core material of the microcapsule is a phase transition agent and a corrosion inhibitor.

[0036] A third aspect of the present invention is to provide a thermal insulation and corrosion-resistant coating, the coating comprising 1-10 wt% of modified microcapsules prepared by the above method, the core material being a phase change agent and a corrosion inhibitor, and a film-forming resin.

[0037] Furthermore, the film-forming resin is selected from a photocurable resin system, a solvent-based resin system, or a water-based resin system.

[0038] In one embodiment, the photocurable resin system comprises a photocurable resin, a photoinitiator, and a first additive;

[0039] In one embodiment, the aqueous resin system comprises an aqueous resin, a curing agent, and a second additive.

[0040] Furthermore, the photocurable resin is selected from one or a combination of polyurethane acrylic resin, epoxy acrylic resin, and polyester acrylate;

[0041] Furthermore, the aqueous resin is selected from one or a combination of epoxy resin, acrylic resin, and silicone resin.

[0042] In one embodiment, the mass ratio of the photocurable resin to the photoinitiator is 1:0.01-1:0.05; the mass percentage of the photocurable resin to the first additive is 1:0.01-1:0.05.

[0043] In one embodiment, the mass ratio of the waterborne resin to the curing agent is 1:1-1.5:1; the mass ratio of the waterborne resin to the second additive is 1:0.02-1.5:0.05.

[0044] Furthermore, the first additive includes an adhesion promoter and a dispersant;

[0045] Furthermore, the adhesion promoter is selected from one or more of di(methacryloyloxyethyl) hydrogen phosphate, 2-methyl-2-acrylate-2-hydroxyethyl phosphate, γ-methacryloyloxypropyltrimethoxysilane, and vinyltrimethoxysilane.

[0046] Furthermore, the dispersant is selected from one or more dispersants such as phosphate esters, phosphates, polyamines, and polyacrylates;

[0047] Furthermore, the second additive is an antifoaming agent;

[0048] Furthermore, the second additive is selected from one or more mineral oils and polysiloxane defoamers.

[0049] Furthermore, the phase change agent is selected from one or a combination of paraffin-based phase change materials, straight-chain alkane-based phase change materials, fatty acid-based phase change materials, and polyethylene glycol.

[0050] Furthermore, the corrosion inhibitor is a metal ion type corrosion inhibitor;

[0051] Furthermore, the metal ion corrosion inhibitor is selected from one or a combination of mercaptobenzothiazole, benzotriazole, and methylbenzotriazole.

[0052] In a preferred embodiment, the mass ratio of the photosensitive prepolymer to the corrosion inhibitor is 1:0.025-1:0.125.

[0053] In a preferred embodiment, the mass ratio of the photosensitive prepolymer to the phase transition agent is 1:0.025-1:0.125.

[0054] Compared with the prior art, this application has at least the following beneficial effects:

[0055] (1) This invention provides a microcapsule surface modification method based on photocuring, which combines the modification step and the microcapsule preparation step into one. The modified material is successfully grafted onto the surface of the microcapsule, and the dispersibility of the modified microcapsule in the resin system is significantly improved.

[0056] (2) Based on the modification method of the present invention, surface-modified microcapsules loaded with corrosion inhibitors and phase transformation agents were successfully prepared. While maintaining the anti-corrosion performance, the dispersibility of the microcapsules can be effectively improved, the proportion of microcapsules added to the coating can be increased, and the performance of the coating can be improved.

[0057] (3) Metal coatings with added bifunctional microcapsules exhibit excellent anti-corrosion performance and at the same time generate a thermal buffer effect, delaying the thermal response of the coating, demonstrating effective temperature regulation capability, reducing energy consumption, and having broad application prospects. Attached Figure Description

[0058] Figure 1 Scanning electron microscopy (SEM) image and energy dispersive spectroscopy (EDS) spectrum of the modified bifunctional microcapsules prepared in Example 1;

[0059] Figure 2 Scanning electron microscopy (SEM) image and elemental energy spectrum of the microcapsule surface of the modified bifunctional microcapsules prepared in Example 2;

[0060] Figure 3 The image shows a scanning electron microscope (SEM) image of the cross section of the sample prepared in Example 3 of the present invention, wherein (a) shows the addition of unmodified microcapsules and (b) shows the addition of modified microcapsules.

[0061] Figure 4 Photographs of the coating prepared in Example 5 and the coating without the added bifunctional microcapsules after a 500-h salt spray test;

[0062] Figure 5 This is a curve showing the change in temperature of the coating surface over time. Detailed Implementation

[0063] To further enhance understanding of the preparation process and technical characteristics involved in this invention, the invention is further illustrated below with reference to specific embodiments. The preparation processes and parameters described in the embodiments are for illustrative purposes only, and the invention is not limited thereto as described in the specific claims.

[0064] Example 1: Preparation of bifunctional microcapsules modified with mercaptoethylamine shell

[0065] (1) Preparation of emulsion: a certain amount of dichloromethane (2.5 parts), butyl stearate (phase transformation agent, 1 part), benzotriazole (corrosion inhibitor, 0.1 part), polyurethane acrylate (1 part), and 2-hydroxy-2-methyl-1-phenyl-1-propanone (0.02 parts) were used as the oil phase, and 2.0 wt% polyvinyl alcohol aqueous dispersion was used as the aqueous phase; the emulsion was obtained after emulsification under the condition of oil-water ratio of 1:6.

[0066] (2) Add 0.5 parts of mercaptoethylamine dropwise to the emulsion obtained in the previous step under stirring. After the addition is complete, stir for 10 min. Stir the emulsion at 20℃ for 10 h to evaporate the organic solvent. Then place it under a UV lamp for photocuring for 15 min to obtain mercaptoethylamine modified bifunctional microcapsules.

[0067] Figure 1The images show scanning electron microscopy (SEM) characterization images and elemental energy dispersive spectroscopy (EDS) spectra of the mercaptoethylamine shell-modified bifunctional microcapsules prepared in Example 1 of this invention. Since mercaptoethylamine contains sulfur, it proves that mercaptoethylamine was successfully grafted onto the surface of the microcapsules, and the mercaptoethylamine shell-modified bifunctional microcapsules were successfully prepared.

[0068] Example 2: Preparation of 2-mercapsule bifunctional microcapsules modified with a 2-mercaptobenzothiazole shell

[0069] (1) Preparation of emulsion: a certain mass of dichloromethane (2.5 parts), butyl stearate (phase transformation agent, 1 part), 2-mercaptobenzothiazole (corrosion inhibitor, 0.125 parts), polyurethane acrylate (1 part), and 2-hydroxy-2-methyl-1-phenyl-1-propanone (0.02 parts) were used as the oil phase, and 2.0 wt% polyvinyl alcohol aqueous dispersion was used as the aqueous phase; the emulsion was obtained after emulsification under the condition of oil-water ratio of 1:4.

[0070] (2) Stir the emulsion obtained in the previous step at 20°C for 10 h to volatilize dichloromethane, and then place it under a UV lamp for photocuring for 15 min to obtain 2-mercaptobenzothiazole modified bifunctional microcapsules.

[0071] Figure 2 The image shows the scanning electron microscope (SEM) characterization of the 2-mercaptobenzothiazole shell-modified bifunctional microcapsules prepared in Example 2 of this invention, as well as the elemental energy spectrum of the microcapsule surface. Since 2-mercaptobenzothiazole contains sulfur, the successful preparation of the 2-mercaptobenzothiazole shell-modified bifunctional microcapsules can be seen from the image.

[0072] Example 3: Effect of mercaptoethylamine shell-modified bifunctional microcapsules on coating dispersibility

[0073] (1) Preparation of resin system: Weigh a certain amount of epoxy acrylate resin (30 parts), polyester acrylate resin (40 parts), isoborneol acrylate (30 parts), 2-methyl-2-acrylate-2-hydroxyethyl ester phosphate (2 parts), 2-hydroxy-2-methyl-1-phenyl-1-propanone (2 parts), and then add 5 parts of unmodified microcapsules and mercaptoethylamine shell-modified bifunctional microcapsules respectively. After ball milling at 2500 rpm and dispersing for 3 min, a mixed resin system with different microcapsules is obtained.

[0074] (2) Preparation of the sample: The resin mixture obtained in the above steps is added into a dumbbell-shaped mold and cured under a tracked UV curing machine to obtain the sample.

[0075] (3) Dispersion test: The samples obtained in the above steps were placed in liquid nitrogen for brittle fracture, and the cross-section of the samples was observed using a scanning electron microscope to compare the dispersion of unmodified microcapsules and mercaptoethylamine shell-modified bifunctional microcapsules in the coating.

[0076] Figure 3 The image shows a scanning electron microscope (SEM) image of the cross section of the sample prepared in Example 3 of this invention. In (a), unmodified microcapsules were added, and obvious agglomeration can be seen in the cross section. In (b), after adding modified microcapsules, the dispersibility of the microcapsules was significantly improved, and the agglomeration phenomenon was significantly reduced.

[0077] Example 4: Effect of bifunctional microcapsules on the basic properties of coatings

[0078] (1) Preparation of coating: Weigh a certain amount of epoxy acrylate resin (30 parts), polyester acrylate resin (40 parts), isoborneol acrylate (30 parts), 2-methyl-2-acrylate-2-hydroxyethyl ester phosphate (2 parts), and 2-hydroxy-2-methyl-1-phenyl-1-propanone (2 parts), and then add 5 parts and 10 parts of mercaptoethylamine shell-modified bifunctional microcapsules respectively. After ball milling at 2500 rpm and dispersing for 3 min, a thermal insulation metal anti-corrosion coating sample with added mercaptoethylamine shell-modified bifunctional microcapsules is obtained.

[0079] (2) Testing of basic coating properties:

[0080] Thickness: The coating was placed horizontally on the table and tested using a Qnix 1500 coating thickness gauge from Germany, according to GB / T13452.2-2008. The same coating was measured three times at different locations, and the final result was the average of the data.

[0081] Pencil hardness test: Place the coating horizontally on the table and scratch the coating surface with a pencil at a 45° angle. Evaluate the pencil hardness of the coating according to GB / T6739-2006 standard. Measure the same coating three times at different locations and take the average of the data.

[0082] Cross-cut adhesion test: Place the coating horizontally on the table and test it according to the national standard GB / T 9286-1998 using the cross-cut method. Measure the same coating three times at different locations and take the average value of the data.

[0083] Impact strength test: The impact strength of the coating is tested using an impact strength tester in accordance with GB 1943-2007. The same coating is measured three times at different locations, and the final result is the average of the data.

[0084] Table 1. Basic Properties of Thermal Insulation and Corrosion-Resistant Coatings

[0085]

[0086] The results are shown in Table 1. As can be seen from the table, the thermal insulation and anti-corrosion coatings prepared with 5 parts and 10 parts of bifunctional microcapsules were not significantly affected in terms of film thickness, pencil hardness, and adhesion compared with the pure resin coating, proving that they have good adhesion and toughness. The impact strength was slightly reduced, but still maintained good impact strength, which can meet the application requirements of the coating.

[0087] Example 5: Effect of bifunctional microcapsules on the anti-corrosion performance of coatings

[0088] (1) Preparation of coating: Weigh epoxy acrylate resin (30 parts), polyester acrylate resin (40 parts), isoborneol acrylate (30 parts), 2-methyl-2-acrylate-2-hydroxyethyl ester phosphate (2 parts), 2-hydroxy-2-methyl-1-phenyl-1-propanone (2 parts), and then add 5 parts and 10 parts of mercaptoethylamine shell-modified bifunctional microcapsules respectively. After ball milling at 2500 rpm and dispersing for 3 min, a thermal insulation metal anti-corrosion coating sample with added mercaptoethylamine shell-modified bifunctional microcapsules is obtained.

[0089] (2) Coating Corrosion Resistance Test: The corrosion resistance of the coating was tested by a neutral salt spray test. The back and edges of the coated low-carbon steel plate were sealed with waterproof tape, and the gaps were then sealed with a mixture of paraffin and rosin. A Q-FOG SSP-600 cyclic corrosion salt spray chamber from Q-Lab was used to conduct the salt spray test according to the standard GB / T 1771-2007 "Determination of Neutral Salt Spray Resistance of Paints and Varnishes". The concentration of NaCl solution used in the salt spray test was 5wt%, the test temperature was 35℃, and the pressure inside the salt spray chamber was 10KPa.

[0090] like Figure 4 As shown in the salt spray test photos, the pure resin coating exhibited pitting corrosion after 100 hours of testing, while the composite coating with 5 parts of bifunctional microcapsules only showed slight pitting corrosion after 300 hours. When the testing time reached 500 hours, the corrosion products on the surface of the pure resin coating were significantly more abundant than those on the composite coating with 5 parts of bifunctional microcapsules. The composite coating with 10 parts of bifunctional microcapsules showed no significant corrosion within 500 hours, indicating that the addition of bifunctional microcapsules effectively improves the corrosion resistance of the coating.

[0091] Example 6: Effect of bifunctional microcapsules on the thermal regulation properties of coatings

[0092] (1) Preparation of coating: Weigh a certain amount of epoxy acrylate resin (30 parts), polyester acrylate resin (40 parts), isoborneol acrylate (30 parts), 2-methyl-2-acrylate-2-hydroxyethyl ester phosphate (2 parts), and 2-hydroxy-2-methyl-1-phenyl-1-propanone (2 parts), and then add 5 parts and 10 parts of mercaptoethylamine shell-modified bifunctional microcapsules respectively. After ball milling at 2500 rpm and dispersing for 3 min, a thermal insulation metal anti-corrosion coating sample with added mercaptoethylamine shell-modified bifunctional microcapsules is obtained.

[0093] (2) Coating thermal regulation performance test: Bifunctional microcapsules were added to the coating and prepared into samples of the same size. The thermal regulation performance was compared by testing the temperature change of different samples over time and by using infrared thermal imaging. The effect of the amount of bifunctional microcapsules added on the thermal regulation performance of the coating was investigated. A pure resin coating was prepared as a control sample. The sample was placed on a heating stage and heated to 60°C, and then cooled to room temperature. The temperature change of the sample over time was tracked and recorded using an infrared thermal imager.

[0094] Figure 5 The graph shows the surface temperature change of the sample over time. As can be seen, the surface temperature of the pure resin coating rises rapidly during heating, reaching approximately 55°C after 30 minutes of heating, without any temperature delay. During cooling, the surface temperature of the pure resin coating decreases rapidly without significant hysteresis. However, the addition of bifunctional microcapsules reduces the heating and cooling rates of the coating, exhibiting a significant hysteresis. Furthermore, the greater the amount of microcapsules added, the more severe the hysteresis becomes. This indicates that the butyl stearate in the bifunctional microcapsules can absorb or release latent heat during heating or cooling, thus generating a thermal buffering effect, delaying the thermal response of the coating, and demonstrating effective temperature regulation capabilities.

Claims

1. A method for modifying microcapsules based on photocuring, wherein the microcapsules comprise a core material and a shell material, the shell material encapsulating the core material; characterized in that, The shell material is prepared by photocuring modified substances and photosensitive prepolymers; the modified substances include one of oil-soluble modified substances and water-soluble modified substances. Modification methods include: Modification Method 1: S11: The organic solvent, core material, photosensitive prepolymer, oil-soluble modifier and photoinitiator are mixed to form the oil phase, and the emulsifier aqueous dispersion is formed to form the aqueous phase; the oil phase and the aqueous phase are mixed and emulsified to obtain an emulsion; S12: After the organic solvent evaporates, the modified microcapsules are obtained by curing them under a light source; Or, alternative modification method two: S21: The organic solvent, core material, photosensitive prepolymer and photoinitiator are mixed to form the oil phase, and the emulsifier aqueous dispersion is formed to form the aqueous phase; the oil phase and the aqueous phase are mixed and emulsified to obtain an emulsion; S22: Add water-soluble modifying material, mix well, evaporate organic solvent, and cure under light source to obtain modified microcapsules; The oil-soluble modifying material is selected from one or more of glycidyl methacrylate and 2-mercaptobenzothiazole; The water-soluble modifying material is selected from one or more of mercaptoethylamine and polyazidepropane; The photosensitive prepolymer is one or a combination of polyurethane acrylate, polyester acrylate and epoxy acrylate; The wavelength of the light source is 230-420nm.

2. The microcapsule modification method based on photocuring as described in claim 1, characterized in that: The emulsifier is one of polyvinyl alcohol, sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, and hexadecyltrimethylammonium bromide; The emulsifier concentration is 0.5wt%-2.0wt%; The volume ratio of the oil phase to the water phase is 1:8 to 1:12; The emulsification method uses a cell disruptor, and the emulsification time is 10-20 minutes. The solvent evaporation method employs mechanical stirring, with an evaporation temperature of 20-60℃ and a stirring time of 2-10 hours.

3. The modified bifunctional microcapsules prepared by the method according to any one of claims 1-2, characterized in that, The core material of the modified bifunctional microcapsule is a phase transition agent and a corrosion inhibitor.

4. A thermal insulation and anti-corrosion coating, characterized in that, It includes 1-10 wt% of the modified bifunctional microcapsules and film-forming resin as described in claim 3.

5. The thermal insulation and anti-corrosion coating according to claim 4, characterized in that, The phase change agent is selected from one or a combination of paraffin-based phase change materials, straight-chain alkane phase change materials, fatty acid phase change materials, and polyethylene glycol; The corrosion inhibitor is a metal ion type corrosion inhibitor.

6. The thermal insulation and anti-corrosion coating according to claim 5, characterized in that, The metal ion corrosion inhibitor is selected from one or a combination of mercaptobenzothiazole, benzotriazole, and methylbenzotriazole.

7. The thermal insulation and anti-corrosion coating according to claim 5, characterized in that, The mass ratio of the photosensitive prepolymer to the corrosion inhibitor is 1:0.025-1:0.

125.

8. The thermal insulation and anti-corrosion coating according to claim 5, characterized in that, The mass ratio of the photosensitive prepolymer to the phase transition agent is 1:0.025-1:0.

125.

9. The thermal insulation and anti-corrosion coating according to any one of claims 4-8, characterized in that, The film-forming resin is a photocurable resin system or a solvent-based resin system.

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