A kind of epoxy self-repairing coating containing double-chamber microcapsules and having photothermal responsiveness and its preparation method

Abstract

The present invention discloses a method for preparing a self-healing epoxy coating containing dual-chamber microcapsules and having photothermal responsiveness. The method comprises the following steps: firstly preparing a polyacrylic acid polymer modified with furfurylamine as a shell material of the microcapsules, and preparing a photothermal responsive microcapsule curing agent by a Pickering emulsion method using a photosensitizer as an emulsifier; then preparing photothermal responsive dual-chamber microcapsules that simultaneously encapsulate a healing agent and a microcapsule curing agent by a Pickering emulsion method; and incorporating the dual-chamber microcapsules into the epoxy coating. The dual-chamber microcapsules are applied to a metal surface to realize the self-healing performance and anti-corrosion function of the coating, and simultaneously realize rapid healing of microcracks on the coating surface under near-infrared light irradiation, thereby helping to improve the long-term service performance of the epoxy coating and having broad application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials and relates to a preparation method and application of a photothermal responsive self-repairing epoxy resin anti-corrosion coating containing double-chamber microcapsules. Background Art

[0002] Organic coatings are considered to be an effective and low-cost strategy for preventing metal corrosion. Epoxy resins have important applications in metal anti-corrosion coatings due to their excellent wear resistance, adhesion strength, and chemical stability. However, when epoxy coatings are mechanically damaged or damaged by the environment, corrosive substances can easily reach the metal substrate through microcracks and gradually cause corrosion, thereby reducing the anti-corrosion effect of the coating. Therefore, self-healing coatings that can repair themselves or help microcracks heal with slight external intervention have attracted widespread attention. They have high application prospects in improving anti-corrosion performance and extending the service life of coatings, and are currently a hot topic of research at home and abroad. Summary of the Invention

[0003] The purpose of the present invention is to provide a preparation method and application of a photothermal responsive self-healing epoxy resin coating. When microcracks caused by mechanical damage or corrosion occur, the curing agent and the healing agent flow out of the double-chamber microcapsule to react and fill the cracks, thereby achieving the purpose of self-healing. At the same time, because the emulsifier in the microcapsule preparation process has photothermal responsiveness, the coating can accelerate the healing of microcracks under the irradiation of 808nm near-infrared light, thereby preventing the steel plate under the coating from corrosion in salt water.

[0004] The preparation method of the epoxy self-repairing coating of the present invention comprises the following steps:

[0005] Step 1: preparing furfurylamine-modified polyacrylic acid: free radical copolymerizing acrylic acid monomer in the presence of azobisisobutyronitrile as an initiator to obtain polyacrylic acid, and then grafting with furfurylamine monomer to obtain furfurylamine-modified polyacrylic acid;

[0006] Step 2: Prepare a photothermal responsive microcapsule curing agent: dissolve the polymer prepared in step 1 as the shell material of the microcapsule in the oil phase, mix the curing agent and the photosensitizer evenly in water, mix the aqueous phase and the oil phase and emulsify them at high speed for 3 minutes to form a stable Pickering emulsion, and continuously stir the emulsion at 60°C for a certain time to prepare the microcapsule curing agent.

[0007] Step 3. Preparation of photothermal responsive dual-chamber microcapsules: The polymer prepared in step 1 is used as the shell material of the microcapsules and the healing agent is dissolved in the oil phase, the microcapsule curing agent prepared in step 2 and the photosensitizer are mixed evenly in water, the aqueous phase and the oil phase are mixed and emulsified at high speed for 3 minutes to form a stable Pickering emulsion, and the emulsion is continuously stirred and reacted at 60°C for a certain time to prepare dual-chamber microcapsules.

[0008] Step 4. Prepare epoxy self-healing coating containing dual-chamber microcapsules: add the photothermal responsive dual-chamber microcapsules prepared in step 3 to bisphenol A epoxy resin containing diethylenetriamine curing agent and allyl glycidyl ether diluent, mix well and prepare epoxy self-healing coating.

[0009] Furthermore, the furfurylamine monomer described in step 1 includes at least one of furfurylamine, 1-furan-2-ethylamine, 2-(5-methyl-2-furyl)ethylamine, and 3-(2-furyl)-1-propylamine; the amount of acrylic acid monomer used is 4 to 6 g, and the amount of furfurylamine monomer used is 0.5 to 2 g.

[0010] Furthermore, in step 2, the amount of the emulsifier is 60 to 150 mg, and the type is one of carbon quantum dots, carbon nanotubes or graphene oxide; the type of the curing agent is one of amine curing agents such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, and m-phenylenediamine; the solvent of the oil phase is one of chloroform, dichloromethane, toluene, and N,N-dimethylformamide; the volume ratio of the water phase to the oil phase is: 1:2 to 1:5; the mass ratio of the curing agent to the shell material is 1:0.8 to 1:1.5, the reaction time is 3 to 5 hours, and the high-speed emulsification rate is 3000 to 7000 rpm.

[0011] Furthermore, in step three, the amount of the emulsifier is 20 to 100 mg, and the type is one of carbon quantum dots, carbon nanotubes or graphene oxide; the solvent of the oil phase is one of chloroform, dichloromethane, toluene, and N,N-dimethylformamide; the healing agent is one of epoxy resin, isophorone diisocyanate, toluene diisocyanate, and diphenylmethane diisocyanate; the amount of the microcapsule curing agent is 20 to 120 mg, the water-oil volume ratio is 1:2 to 1:5, the mass ratio of the healing agent to the shell material is 0.6:1 to 1:1, the reaction time is 3 to 5 hours, and the high-speed emulsification rate is 3000 to 7000 rpm.

[0012] Furthermore, in step 4, the coating composition is: the mass ratio of epoxy resin, curing agent, diluent, and double-chamber microcapsule is 1:0.1:0.15:0.01-0.04.

[0013] The beneficial effects of the present invention are:

[0014] Encapsulating the curing agent and the healing agent in one microcapsule can avoid the incomplete healing of cracks caused by the uneven dispersion of traditional double microcapsules; during the preparation of the microcapsules, the emulsifier also acts as a photosensitizer to react with the furfurylamine-modified polyacrylic acid shell material, making the microcapsules photothermal responsive. After being incorporated into the epoxy resin, the microcracks can be quickly healed in a short period of time under near-infrared light, realizing the self-repair function of the coating, which helps to improve the long-term service performance of the coating and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a scanning electron microscope image of the double-chamber microcapsule of the present invention;

[0016] Figure 2 This is a photo of the anti-corrosion of the epoxy resin coating of the present invention after being immersed in 3.5wt% salt water for 96 hours;

[0017] Figure 3 2 are electron microscope images of cracks on the epoxy resin coating in Example 5 (left) and Comparative Example 2. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to specific embodiments.

[0019] Example 1

[0020] Step 1: Preparation of furfurylamine-modified polyacrylic acid

[0021] 4g of acrylic acid and 1.56g of azobisisobutyronitrile were added to 40ml of tetrahydrofuran and polymerized under nitrogen. The reaction temperature and reaction time were 70°C and 24 hours, respectively. After the reaction, polyacrylic acid was precipitated with n-hexane. Then, 10ml of dry N,N-dimethylformamide was added and mixed thoroughly. 0.5g of furfurylamine was added dropwise and reacted at 60°C for 5 hours. After the reaction, furfurylamine-modified polyacrylic acid was obtained by precipitation with diethyl ether.

[0022] Step 2: Preparation of microcapsule curing agent

[0023] 1 ml of DETA and 60 mg of carbon quantum dots were dissolved in 8 ml of water as the aqueous phase; 0.8 g of furfurylamine-modified polyacrylic acid was dissolved in 16 ml of chloroform as the oil phase. The aqueous and oil phases were sheared at 5000 rpm for 2 minutes to form an emulsion. The mixture was then reacted at 1000 rpm and 60°C for 3 hours, with reflux through a condenser. After the reaction, the product was collected by centrifugation and washed with water.

[0024] Step 3: Preparation of photothermal responsive dual-chamber microcapsules

[0025] 40 mg of microcapsule curing agent and 40 mg of carbon quantum dots were dispersed in 16 ml of aqueous phase. 1 g of furfurylamine-modified polyacrylic acid and 0.6 g of E51 were dissolved in 8 ml of chloroform as the oil phase. The aqueous and oil phases were sheared at 5000 rpm for 2 minutes. After forming an emulsion, the mixture was reacted at 1000 rpm and 60°C for 3 hours, with reflux through a condenser. After the reaction, the mixture was centrifuged and freeze-dried. The results of the curing agent and healing agent content in the dual-chamber microcapsules are shown in Table 1.

[0026] Step 4: Preparation of epoxy self-healing coating containing dual-chamber microcapsules

[0027] 0.05 g of dual-chamber microcapsules, 5 g of epoxy resin E51, 0.75 g of allyl glycidyl ether and 0.5 g of diethylenetriamine were mixed evenly to obtain an epoxy resin self-healing coating containing 1 wt % of dual-chamber microcapsules.

[0028] The epoxy self-healing coating was applied to one side of a dry steel plate using a 100μm coating rod and cured in a 50°C drying oven for 1.5 hours. The coating was scratched with a No. 11 scalpel and then irradiated with infrared light (808nm) for 1 minute. The coating was then immersed in 3.5wt% saline for 96 hours to observe surface corrosion. The resistance of the coating was measured using an electrochemical workstation. The results are shown in Table 1.

[0029] Example 2

[0030] Step 1: Preparation of furfurylamine-modified polyacrylic acid

[0031] 4g of acrylic acid and 1.56g of azobisisobutyronitrile were added to 40ml of tetrahydrofuran and polymerized under nitrogen. The reaction temperature and reaction time were 70°C and 24 hours, respectively. After the reaction, polyacrylic acid was precipitated with n-hexane. Then, 10ml of dry N,N-dimethylformamide was added and mixed thoroughly. 1.0g of furfurylamine was added dropwise and reacted at 60°C for 5 hours. After the reaction, furfurylamine-modified polyacrylic acid was obtained by precipitation with diethyl ether.

[0032] Step 2: Preparation of microcapsule curing agent

[0033] Dissolve 1 ml of DETA and 80 mg of carbon quantum dots in 8 ml of water as the aqueous phase; dissolve 1.0 g of furfurylamine-modified polyacrylic acid in 24 ml of chloroform as the oil phase. High-speed shearing of the aqueous and oil phases was performed at 5000 rpm for 2 minutes to form an emulsion. The mixture was then reacted at 1000 rpm and 60°C for 5 hours, with reflux through a condenser. After the reaction, the product was collected by centrifugation and washed with water.

[0034] Step 3: Preparation of photothermal responsive dual-chamber microcapsules

[0035] 50 mg of microcapsule curing agent and 60 mg of carbon quantum dots were dispersed in 24 ml of aqueous phase. 1 g of furfurylamine-modified polyacrylic acid and 0.8 g of E51 were dissolved in 8 ml of chloroform as the oil phase. The aqueous and oil phases were sheared at 7000 rpm for 2 minutes. After forming an emulsion, the mixture was reacted at 1000 rpm and 60°C for 3 hours, with reflux through a condenser. After the reaction, the mixture was centrifuged and freeze-dried. The results of the curing agent and healing agent content in the dual-chamber microcapsules are shown in Table 1.

[0036] Step 4: Preparation of epoxy self-healing coating containing dual-chamber microcapsules

[0037] 0.1 g of dual-chamber microcapsules, 5 g of epoxy resin E51, 0.75 g of allyl glycidyl ether and 0.5 g of diethylenetriamine were mixed evenly to obtain an epoxy resin self-healing coating containing 1 wt % of dual-chamber microcapsules.

[0038] The epoxy self-healing coating was applied to one side of a dry steel plate using a 100μm coating rod and cured in a 50°C drying oven for 1.5 hours. The coating was scratched with a No. 11 scalpel and then irradiated with infrared light (808nm) for 1 minute. The coating was then immersed in 3.5wt% saline for 96 hours to observe surface corrosion. The resistance of the coating was measured using an electrochemical workstation. The results are shown in Table 1.

[0039] Example 3

[0040] Step 1: Preparation of furfurylamine-modified polyacrylic acid

[0041] 5g of acrylic acid and 1.56g of azobisisobutyronitrile were added to 40ml of tetrahydrofuran and polymerized under nitrogen. The reaction temperature and reaction time were 70°C and 24 hours, respectively. After the reaction, polyacrylic acid was precipitated with n-hexane. Then, 10ml of dry N,N-dimethylformamide was added and mixed thoroughly. 1.5g of furfurylamine was added dropwise and reacted at 60°C for 5 hours. After the reaction, furfurylamine-modified polyacrylic acid was obtained by precipitation with diethyl ether.

[0042] Step 2: Preparation of microcapsule curing agent

[0043] 1 ml of DETA and 100 mg of carbon quantum dots were dissolved in 8 ml of water as the aqueous phase; 1.3 g of furfurylamine-modified polyacrylic acid was dissolved in 40 ml of chloroform as the oil phase. The aqueous and oil phases were sheared at 7000 rpm for 2 minutes to form an emulsion. The mixture was then reacted at 1000 rpm and 60°C for 3 hours, with reflux through a condenser. After the reaction, the product was collected by centrifugation and washed with water.

[0044] Step 3: Preparation of photothermal responsive dual-chamber microcapsules

[0045] 120 mg of microcapsule curing agent and 80 mg of carbon quantum dots were dispersed in 40 ml of aqueous phase. 1 g of furfurylamine-modified polyacrylic acid and 0.9 g of E51 were dissolved in 8 ml of chloroform as the oil phase. The aqueous and oil phases were sheared at 5000 rpm for 2 minutes. After forming an emulsion, the mixture was reacted at 1000 rpm and 60°C for 5 hours, then refluxed using a condenser. After the reaction, the mixture was centrifuged and freeze-dried. The results of the curing agent and healing agent content in the dual-chamber microcapsules are shown in Table 1.

[0046] Step 4: Preparation of epoxy self-healing coating containing dual-chamber microcapsules

[0047] 0.2 g of dual-chamber microcapsules, 5 g of epoxy resin E51, 0.75 g of allyl glycidyl ether and 0.5 g of diethylenetriamine were mixed evenly to obtain an epoxy resin self-healing coating containing 1 wt % of dual-chamber microcapsules.

[0048] The epoxy self-healing coating was applied to one side of a dry steel plate using a 100μm coating rod and cured in a 50°C drying oven for 1.5 hours. The coating was scratched with a No. 11 scalpel and then irradiated with infrared light (808nm) for 1 minute. The coating was then immersed in 3.5wt% saline for 96 hours to observe surface corrosion. The resistance of the coating was measured using an electrochemical workstation. The results are shown in Table 1.

[0049] Example 4

[0050] Step 1: Preparation of furfurylamine-modified polyacrylic acid

[0051] 6g of acrylic acid and 1.56g of azobisisobutyronitrile were added to 40ml of tetrahydrofuran and polymerized under nitrogen. The reaction temperature and reaction time were 70°C and 24 hours, respectively. After the reaction, polyacrylic acid was precipitated with n-hexane. Then, 10ml of dry N,N-dimethylformamide was added and mixed thoroughly. 2g of furfurylamine was added dropwise and reacted at 60°C for 5 hours. After the reaction, furfurylamine-modified polyacrylic acid was obtained by precipitation with diethyl ether.

[0052] Step 2: Preparation of microcapsule curing agent

[0053] 1 ml of DETA and 150 mg of carbon quantum dots were dissolved in 8 ml of water as the aqueous phase; 1.5 g of furfurylamine-modified polyacrylic acid was dissolved in 32 ml of chloroform as the oil phase. The aqueous and oil phases were sheared at 3000 rpm for 2 minutes to form an emulsion. The mixture was then reacted at 1000 rpm and 60°C for 5 hours, with reflux through a condenser. After the reaction, the product was collected by centrifugation and washed with water.

[0054] Step 3: Preparation of photothermal responsive dual-chamber microcapsules

[0055] 100 mg of microcapsule curing agent and 120 mg of carbon quantum dots were dispersed in 40 ml of aqueous phase. 1 g of furfurylamine-modified polyacrylic acid and 1 g of E51 were dissolved in 8 ml of chloroform as the oil phase. The aqueous and oil phases were sheared at 5000 rpm for 2 minutes. After forming an emulsion, the mixture was reacted at 1000 rpm and 60°C for 4 hours, with reflux through a condenser. After the reaction, the mixture was centrifuged and freeze-dried. The results of the curing agent and healing agent content in the dual-chamber microcapsules are shown in Table 1.

[0056] Step 4: Preparation of epoxy self-healing coating containing dual-chamber microcapsules

[0057] 0.2 g of dual-chamber microcapsules, 5 g of epoxy resin E51, 0.75 g of allyl glycidyl ether and 0.5 g of diethylenetriamine were mixed evenly to obtain an epoxy resin self-healing coating containing 4 wt % of dual-chamber microcapsules.

[0058] The epoxy self-healing coating was applied to one side of a dry steel plate using a 100μm coating rod and cured in a 50°C drying oven for 1.5 hours. The coating was scratched with a No. 11 scalpel and then irradiated with infrared light (808nm) for 1 minute. The coating was then immersed in 3.5wt% saline for 96 hours to observe surface corrosion. The resistance of the coating was measured using an electrochemical workstation. The results are shown in Table 1.

[0059] Example 5

[0060] Step 1: Preparation of furfurylamine-modified polyacrylic acid

[0061] 6g of acrylic acid and 1.56g of azobisisobutyronitrile were added to 40ml of tetrahydrofuran and polymerized under nitrogen. The reaction temperature and reaction time were 70°C and 24 hours, respectively. After the reaction, polyacrylic acid was precipitated with n-hexane. Then, 10ml of dry N,N-dimethylformamide was added and mixed thoroughly. 1.5g of furfurylamine was added dropwise and reacted at 60°C for 5 hours. After the reaction, furfurylamine-modified polyacrylic acid was obtained by precipitation with diethyl ether.

[0062] Step 2: Preparation of microcapsule curing agent

[0063] 1 ml of DETA and 120 mg of carbon quantum dots were dissolved in 8 ml of water as the aqueous phase; 1.5 g of furfurylamine-modified polyacrylic acid was dissolved in 32 ml of chloroform as the oil phase. The aqueous and oil phases were sheared at 6000 rpm for 2 minutes to form an emulsion. The mixture was then reacted at 1000 rpm and 60°C for 3 hours, with reflux through a condenser. After the reaction, the product was collected by centrifugation and washed with water.

[0064] Step 3: Preparation of photothermal responsive dual-chamber microcapsules

[0065] 100 mg of microcapsule curing agent and 100 mg of carbon quantum dots were dispersed in 32 ml of aqueous phase. 1 g of furfurylamine-modified polyacrylic acid and 1 g of E51 were dissolved in 8 ml of chloroform as the oil phase. The aqueous and oil phases were sheared at 5000 rpm for 2 minutes. After forming an emulsion, the mixture was reacted at 1000 rpm and 60°C for 5 hours, with reflux through a condenser. After the reaction, the mixture was centrifuged and freeze-dried. The results of the curing agent and healing agent content in the dual-chamber microcapsules are shown in Table 1.

[0066] Step 4: Preparation of epoxy self-healing coating containing dual-chamber microcapsules

[0067] 0.15 g of dual-chamber microcapsules, 5 g of epoxy resin E51, 0.75 g of allyl glycidyl ether and 0.5 g of diethylenetriamine were mixed evenly to obtain an epoxy resin self-healing coating containing 3 wt % of dual-chamber microcapsules.

[0068] The epoxy self-healing coating was applied to one side of a dry steel plate using a 100μm coating rod and cured in a 50°C drying oven for 1.5 hours. The coating was scratched with a No. 11 scalpel and then irradiated with infrared light (808nm) for 1 minute. The coating was then immersed in 3.5wt% saline for 96 hours to observe surface corrosion. The resistance of the coating was measured using an electrochemical workstation. The results are shown in Table 1.

[0069] Comparative Example 1:

[0070] 5 g of epoxy resin, 0.75 g of allyl glycidyl ether E51 and 0.5 g of diethylenetriamine were uniformly mixed to obtain an epoxy resin coating without double-chamber microcapsules.

[0071] The epoxy resin coating was applied to one side of a dry steel plate using a 100μm coating rod and cured in a 50°C drying oven for 1.5 hours. The coating was scratched with a No. 11 scalpel and then irradiated with infrared light for 1 minute. The coating was then immersed in 3.5wt% saline for 96 hours to observe surface corrosion. The resistance of the coating was measured using an electrochemical workstation. The results are shown in Table 1.

[0072] Comparative Example 2

[0073] Step 1: Prepare furfurylamine-modified polyacrylic acid according to Example 5.

[0074] Step 2: Prepare a microcapsule curing agent according to Example 5.

[0075] Step 3: Prepare photothermal responsive double-chamber microcapsules according to Example 5.

[0076] Step 4: Prepare an epoxy resin self-healing coating containing dual-chamber microcapsules according to Example 5.

[0077] The epoxy self-healing coating was applied to one side of a dry steel plate using a 100μm coating rod and cured in a 50°C drying oven for 1.5 hours. The coating was scratched with a No. 11 scalpel and then immersed in 3.5wt% saline for 96 hours to observe surface corrosion. Its resistance was measured using an electrochemical workstation. The results are shown in Table 1.

[0078] Table 1 Microcapsule core material content and corrosion resistance test results of epoxy coatings in various examples and comparative examples

[0079]

[0080] Combined with the data in Table 1 Figure 2 、 Figure 3 It can be seen that when a certain amount of dual-chamber microcapsules are added to the epoxy resin, the coating can self-heal when cracks occur, thereby preventing the occurrence of corrosion, and the measured resistance value is relatively large; at the same time, dual-chamber microcapsules with a higher core content have better healing efficiency. Compared with Example 1, the epoxy resin coating without the addition of dual-chamber microcapsules has severe corrosion of the metal material at the scratches, and the coating will peel off if soaked in salt water for a long time. In addition, in Example 2, when there is no near-infrared light, the healing rate of the epoxy resin coating incorporated with the dual-chamber microcapsules is reduced, and corrosion will also occur at the scratches if soaked in salt water for a long time. The dual-chamber microcapsules of the present invention can be widely used in epoxy coatings of various thicknesses to achieve the self-healing and metal anti-corrosion properties of the coating and extend the service life of the coating.

Claims

1. A method for preparing a photothermal responsive epoxy self-healing coating containing dual-chamber microcapsules, comprising the following steps: Step 1: Preparation of furfurylamine-modified polyacrylic acid: free radical polymerization of acrylic acid monomer in the presence of azobisisobutyronitrile as an initiator at 70°C for 24 hours to obtain polyacrylic acid, followed by grafting reaction with furfurylamine monomer at 60°C for 5 hours to obtain furfurylamine-modified polyacrylic acid polymer; Step 2: Prepare a photothermal responsive microcapsule curing agent: dissolve the polymer prepared in step 1 as the shell material of the microcapsule in the oil phase, mix the curing agent and the photosensitizer in water, emulsify the aqueous phase and the oil phase at high speed for 3 minutes to form a stable Pickering emulsion, and continuously stir the emulsion at 60°C for a certain period of time to prepare the microcapsule curing agent; Step 3: Preparation of photothermal responsive dual-chamber microcapsules: The polymer prepared in step 1 is used as the shell material of the microcapsules and the healing agent is dissolved in the oil phase. The microcapsule curing agent prepared in step 2 and the photosensitizer are mixed evenly in water. The aqueous phase and the oil phase are mixed and emulsified at high speed for 3 minutes to form a stable Pickering emulsion. The emulsion is continuously stirred and reacted at 60°C for a certain period of time to prepare dual-chamber microcapsules. Step 4: Prepare an epoxy self-healing coating containing dual-chamber microcapsules: add the photothermal responsive dual-chamber microcapsules prepared in step 3 to a bisphenol A epoxy resin containing diethylenetriamine curing agent and allyl glycidyl ether diluent, mix well and prepare an epoxy self-healing coating; The photosensitizing emulsifier in step 2 and step 3 is one of carbon quantum dots, carbon nanotubes or graphene oxide.

2. The method for preparing a dual-chamber microcapsule-containing epoxy self-repairing coating according to claim 1, characterized in that In step 1, the furfurylamine monomer includes one of furfurylamine, 1-furan-2-ylethylamine, 2-(5-methyl-2-furyl)ethylamine, and 3-(2-furyl)-1-propylamine; The amount of acrylic acid monomer used is 4-6 g, and the amount of furfurylamine monomer used is 0.5-2 g.

3. The method for preparing a dual-chamber microcapsule-containing epoxy self-repairing coating having photothermal responsiveness according to claim 1, characterized in that In step 2, the amount of the emulsifier is 60-150 mg; The curing agent is one of diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine and m-phenylenediamine curing agents; The oil phase solvent is one of chloroform, dichloromethane, toluene and N,N-dimethylformamide; The volume ratio of the water phase to the oil phase is 1:2-1:5; the mass ratio of the curing agent to the shell material is 1:0.8-1:1.5; the reaction time is 3-5 hours; and the high-speed emulsification rate is 3000-7000 rpm.

4. The method for preparing a dual-chamber microcapsule-containing epoxy self-repairing coating having photothermal responsiveness according to claim 1, characterized in that In step 3, the amount of the emulsifier is 20-100 mg; The oil phase solvent is one of chloroform, dichloromethane, toluene and N,N-dimethylformamide; The healing agent is one of epoxy resin, isophorone diisocyanate, toluene diisocyanate, and diphenylmethane diisocyanate; The dosage of the microcapsule curing agent is 20-120 mg, the water-oil volume ratio is 1:2-1:5, the mass ratio of the healing agent to the shell material is 0.6:1-1:1, the reaction time is 3-5 h, and the high-speed emulsification rate is 3000-7000 rpm.

5. The method for preparing a dual-chamber microcapsule-containing epoxy self-repairing coating having photothermal responsiveness according to claim 1, characterized in that In step 4, the coating is composed of: bisphenol A epoxy resin, diethylenetriamine curing agent, allyl glycidyl ether diluent, and double-chamber microcapsules in a mass ratio of 1:0.1:0.15:0.01~0.04.

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