Self-repairing waterproof double-shell capsule, coating and preparation method thereof

Abstract

The application discloses a kind of self-repairing waterproof preparation method, it relates to the technical field of waterproof material preparation, it includes the following steps: S1.the raw material of self-repairing material is obtained by synthesis to obtain self-repairing liquid;S2.active activated carbon is added to self-repairing liquid and is stirred and grinds uniformly, to obtain self-repairing seed;S3.the self-repairing seed is added to paraffin liquid and is stirred, to obtain paraffin coating self-repairing seed emulsion;S4.paraffin coating self-repairing seed emulsion is atomized granulation, solidification, to obtain single-shell self-repairing capsule;S5.single-shell self-repairing capsule and the raw material of single-component polyurethane curing layer are added, after mixing, to obtain the self-repairing waterproof coating containing double-shell self-repairing capsule.The coating prepared by the application has excellent waterproof performance, good salt fog resistance, tensile strength ≥2.0MPa, and breaking elongation ≥800%.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of waterproof material preparation, and specifically relates to a self-repairing waterproof double-shell capsule, paint and a preparation method thereof. BACKGROUND

[0002] In the field of coatings, self-repairing waterproof coatings are widely used due to their excellent water resistance, high and low temperature resistance, and short curing time. These coatings not only can be applied on wet substrates, but also have good high and low temperature resistance, freeze-thaw resistance, can prevent carbonate penetration, and prevent salt pollution and erosion of the finish. Self-repairing microcapsules are a kind of microspheres that can repair damage by themselves. They are usually wrapped by a polymer shell and contain active substances inside. When the microcapsules are damaged, such as cracks or breakage, the active substances inside will be released and react with the surrounding environment to repair the damage, thereby achieving self-repairing function.

[0003] However, there are still some problems in the industrial use of microcapsule type self-repairing coatings. In terms of preparation method, although there are many methods for preparing microcapsules, such as emulsion template method and in-situ emulsion polymerization method, it is a challenge to choose the most suitable preparation technology to ensure the uniformity and stability of the microcapsules in the preparation of double-layer self-repairing capsules. In terms of microcapsule wall material, in order to enhance the self-repairing ability of self-repairing microcapsules, the wall material needs to be selected or modified to adapt to different application scenarios. At present, patent CN115093774A provides a self-repairing anticorrosive coating preparation method, which uses silicon dioxide as a carrier, adsorbs benzotriazole as an anticorrosive inhibitor, and coats with EPS resin microspheres and other repair liquids to form a single-layer capsule mode. This patent does not mention how to prepare the capsule and how to wrap the repair liquid into the capsule, and the problem of whether it can be industrialized or realized has not been solved. At the same time, this invention is mainly used to improve the corrosion resistance of the coating, and whether it can be applied to waterproof coatings is not involved. Patent CN107446502B discloses a self-repairing water-based epoxy / asphalt composite waterproof coating and a preparation method thereof. The waterproof principle of the coating is that the high water-absorbing resin in the microcapsule absorbs water to swell and block the cracks, and the polyurethane prepolymer in the capsule reacts with water to form macromolecular chains to achieve self-repairing function. However, this repair has some defects. First, after the high molecular water-absorbing material absorbs water, the water is absorbed by the polyurethane prepolymer to react, which will cause the high molecular water-absorbing material to shrink due to water loss, resulting in micro gaps between the capsule and the epoxy / asphalt film, thereby causing water permeability and losing waterproof function. Second, the composition of the microcapsule material is different from the epoxy / asphalt material of the film, even after self-repairing, there is still a problem of interlayer isolation between the materials, and there is still a risk of water permeability between the layers, losing the waterproof function.

[0004] In general, in the design and manufacturing process of waterproof double-shell capsules in the prior art, the outer shell usually has only a single-layer structure, and the outer shell and the capsule inner shell material are incompatible, which may cause structural defects in the paint film layer after curing, thereby affecting the waterproof effect. There is still a possibility of water seepage in the selection of capsule raw materials. A single self-repairing anti-corrosion or waterproof coating requires multiple constructions under environmental application requirements that require both anti-corrosion and waterproofing, which will lead to higher construction costs. The self-repairing waterproof double-shell capsule and coating of the present invention is a new material with important application potential. The development of a multi-layer hydrophobic capsule structure will bring new research and development ideas to this field, and the application prospects of this type of capsule will be broader. The present invention provides a new multifunctional material with self-repairing, waterproof and high corrosion resistance in a one-time construction. Summary of the Invention

[0005] The present invention provides a self-repairing waterproof double-shell capsule, coating, and preparation method. These overcome the unstable self-repairing performance of existing technologies, which only have a single shell structure, and the potential for permeation of hydrophilic self-repairing materials after continuous water absorption. The coating provided by the present invention exhibits self-repairing properties, excellent waterproof and corrosion resistance, and good tensile properties.

[0006] The present invention provides a method for preparing a self-repairing waterproof coating, which comprises the following steps:

[0007] S1. The raw materials of the self-repairing material are synthesized to obtain a self-repairing liquid; the raw materials of the self-repairing material include 30 to 53 parts of polyether, 42 to 58 parts of chlorinated paraffin, 0.1 to 0.9 parts of a wetting and dispersing agent, 10 to 20 parts of a chain extender, 0.1 to 1.0 parts of a defoaming agent, and 0.1 to 0.8 parts of a drying agent;

[0008] S2. Add the activated carbon to the self-repairing solution and stir and grind evenly to obtain self-repairing seeds;

[0009] S3. The self-repairing seeds are added to the paraffin liquid and stirred and emulsified to obtain a paraffin-coated self-repairing seed emulsion;

[0010] S4. The paraffin-coated self-repairing seed emulsion is atomized and granulated and solidified to obtain a single-shell self-repairing capsule;

[0011] S5. Add the raw materials of single-shell self-repairing capsules and single-component polyurethane curing layer, mix and obtain a self-repairing waterproof coating containing double-shell self-repairing capsules; the raw materials of the single-component polyurethane curing layer include 40 to 60 parts of self-repairing liquid, 30 to 50 parts of spherical silicon powder, 0.05 to 0.5 parts of defoaming agent, and 0.5 to 1.5 parts of wetting dispersant.

[0012] Further, the raw materials of the self-repairing material include polyether 30-40 parts, chlorinated paraffin 47-52 parts, wetting dispersant 0.2-0.5 parts, chain extender 11-15 parts, defoaming agent 0.3-0.7 parts, and drying agent 0.1-0.3 parts; for example, polyether 35 parts, chlorinated paraffin 50 parts, wetting dispersant 0.3 parts, chain extender 13 parts, defoaming agent 0.5 parts, and drying agent 0.2 parts.

[0013] Further, the raw materials of the single-component polyurethane curing layer include self-repairing liquid 45-55 parts, spherical silica micro powder 37-44 parts, single-shell self-repairing capsule 8-13 parts, defoaming agent 0.1-0.2 parts, and dispersant 0.7-1.1 parts; for example, self-repairing liquid 49 parts, spherical silica micro powder 40 parts, single-shell self-repairing capsule 10 parts, defoaming agent 0.1 parts, and dispersant 0.9 parts.

[0014] In the present application, the amount of each raw material is in mass parts.

[0015] In the present application, the polyether includes polyether polyol.

[0016] In the present application, the wetting dispersant includes Fite FT wetting dispersant.

[0017] In the present application, the defoaming agent includes silicon-containing solvent-type defoaming agent and silicon-free solvent-type defoaming agent.

[0018] In the present application, the drying agent includes You Run WCAT drying agent.

[0019] In the present application, the chain extender includes isocyanate.

[0020] In the present application, the chlorinated paraffin is Sinopec 52# paraffin wax. The chlorinated paraffin is a low-melting-point paraffin wax, which also has a hydrophobic effect as a plasticizer for paint film.

[0021] In S2, the mass ratio of the self-repairing liquid to the activated activated carbon is 1:(0.5-9), for example, 1:0.67, 1:2.3, or 1:9.

[0022] In S4, the mass ratio of the self-repairing seed to the paraffin liquid is 1:(1.3-3.6), for example, 1:2.3.

[0023] In S5, the mass ratio of the self-repairing capsule to the raw materials of the single-component polyurethane curing layer is 1:(1-15), preferably 1:(1-11), for example, 1:9, 1:4, or 1:1.

[0024] In the present application, the S1 further comprises a pre-treatment operation; the pre-treatment operation is that the activated carbon is dried at 500-700℃ under nitrogen protection for 3-5h, and then cooled to room temperature to obtain activated activated carbon; preferably, the activated carbon is dried at 600℃ for 4h under nitrogen, and then cooled to room temperature to obtain activated activated carbon.

[0025] In S1, the method for synthesizing mixes polyether, chlorinated paraffin, wetting dispersant, and then dehydrates under vacuum, and then adds isocyanate for polymerization after cooling, and then adds defoaming agent and drying catalyst for vacuum defoaming.

[0026] Further in S1, the porosity of the activated carbon is ≥50%, and the fineness is ≥300 meshes; preferably, the porosity of the activated carbon is 85%

[0027] Further in S1, the temperature of the vacuum dehydration is 110-130℃, and preferably 120℃; further in S1, the vacuum degree of the vacuum dehydration is ≤-0.08MPa.

[0028] Further in S1, the temperature after cooling is 70-90℃, and preferably 75-85℃.

[0029] Further in S1, the polymerization time is 2-5h, and preferably 3h.

[0030] Further in S1, the vacuum defoaming time is 10-20min, and preferably 15min; the stirring speed of the vacuum defoaming is 100-300rpm; and the vacuum degree of the vacuum defoaming is ≤-0.08MPa.

[0031] In S2, the stirring and grinding speed is 700-1500rpm, and preferably 1000rpm.

[0032] In S2, the uniformity standard is that the grinding fineness is ≤1000nm.

[0033] In S3, the paraffin liquid is obtained by heating and melting paraffin, and the heating temperature is 80℃.

[0034] In S3, the stirring and emulsifying time is 0.5-2h, and preferably 1h; and the stirring speed of the stirring and emulsifying is 1700-2500rpm, and preferably 2000rpm.

[0035] In S4, the temperature of the atomization and granulation is -8-0℃, and preferably -5℃; wherein, the lower the temperature of the atomization and granulation, the faster the paraffin solidification, and the easier the granulation.

[0036] In S4, the particle size of the granulation is ≤100μm,

[0037] In S4, the curing is carried out in air, and the curing time is 18-30 hours, preferably 24 hours.

[0038] In S5, the stirring speed of the mixing is 150-250 rpm, preferably 200 rpm; and the mixing time is 20-45 minutes, preferably 30 minutes.

[0039] The self-repairing waterproof coating obtained by the preparation method has a tensile strength of ≥2.0 MPa and a breaking elongation of ≥800%, and has excellent waterproof performance, corrosion resistance and salt spray resistance.

[0040] The self-repairing waterproof double-shell capsule comprises, from the inside out, a capsule core, a capsule inner shell and a capsule outer shell; the capsule core is a self-repairing seed composed of activated activated carbon adsorbed self-repairing material, the capsule inner shell is a paraffin sealing layer, and the capsule outer shell is a single-component polyurethane curing layer. The single-component polyurethane curing layer undergoes crosslinking reaction with moisture in the air to complete repair; that is, when the capsule is damaged by external force, the capsule releases the self-repairing material to contact with moisture in the air to undergo gelation reaction, thereby healing scratches or cracks and realizing self-repairing ability.

[0041] The application adopts double-layer encapsulation technology, utilizes the porous characteristics of activated carbon, and takes activated carbon with high porosity as the core. The capsule inner shell is a paraffin sealing layer; firstly, paraffin can play an isolation role, which can protect the internal self-repairing material from being cured and can isolate the single-component polyurethane curing layer of the outer shell from continuing to cure the internal self-repairing liquid after curing; secondly, paraffin has a high melting point and is solid at low temperature, which makes it more convenient for granulation at low temperature; thirdly, paraffin has hydrophobicity, which has a gain effect on the waterproof effect of the coating. The capsule outer shell is a single-component polyurethane curing layer. The capsule outer shell and the self-repairing material have similar composition and solubility and polarity, so even if the capsule structure is damaged, there will be no structure between the paint film layers, further improving the waterproof ability of the repaired paint film; in addition, the capsule outer shell can also protect the internal shell layer from being damaged, and the curing into a film is an irreversible reaction, which is not easily dissolved by general solvents, thereby protecting the capsule inner shell from being dissolved by liquid materials in the coating.

[0042] Compared with the prior art, the application has the following beneficial effects:

[0043] 1. In terms of process design, the application can better protect the structure and function of the capsule inside by adopting double-layer encapsulation technology and special curing layer design, and improve the waterproof ability of the repaired paint film.

[0044] 2. In the aspect of capsule raw material selection, high porosity activated carbon is used as the inner core; paraffin can protect the capsule inner core, so that the self-repairing liquid is not solidified, and has hydrophobicity and isolation effect, thereby improving the waterproof effect; the capsule shell has similar solubility and polarity to the self-repairing material, and is not easy to be dissolved after being solidified into a film, thereby protecting the capsule inner shell. The capsule structure and material selection can effectively prevent the capsule shell from being dissolved in the coating containing a solvent, so that the self-repairing coating loses the self-repairing function. The repair coating is prevented from being invalid after storage.

[0045] 3. In the aspect of preparation method, the low-temperature granulation method is used, the paraffin with high melting point is easy to solidify under low-temperature conditions, and granulation is more convenient; the preparation method is simple, the raw materials and equipment are common, and thus the cost is low, which is conducive to large-scale production and application.

[0046] 4. In the aspect of performance, the prepared coating has excellent waterproof performance, the tensile strength is greater than or equal to 2.0 MPa, the tensile elongation at break is greater than or equal to 800%, and the salt spray resistance time is greater than or equal to 1500 h. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 FIG. 1 is a schematic diagram of a self-repairing waterproof double-shell capsule structure. DETAILED DESCRIPTION

[0048] In order to facilitate the understanding of the present application, the following will combine the preferred embodiments to make a more comprehensive and detailed description of the present application, but the protection scope of the present application is not limited to the following specific embodiments.

[0049] Unless otherwise defined, all professional terms used in the following have the same meaning as generally understood by those skilled in the art. The professional terms used in the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the protection scope of the present application.

[0050] The manufacturers and models of the raw materials used in the following examples include but are not limited to the following Table 1.

[0051] Table 1

[0052] Raw materials Specification model Manufacturer Activated carbon 800 mesh, porosity 85% Self-made Anhydrous polyether JQD-220G Jin Cui Chain extender Isocyanate Wanhua Defoaming agent EFKA BASF Wetting dispersant FT Fite Chlorinated paraffin 52# Sinopec Paraffin wax 70 Sinopec Catalyst WCAT You Run

[0053] Example 1

[0054] (1) Activated carbon activation

[0055] 100 kg of 800 mesh activated carbon was fed into the activated carbon fluidized bed, activated at 600℃ for 4 hours under nitrogen atmosphere. After cooling to room temperature under nitrogen atmosphere, activated activated carbon powder was obtained.

[0056] (2) Preparation of self-repairing liquid

[0057] Polyether 35 parts, chlorinated paraffin 51 parts, wetting dispersant 0.3 parts are put into the polymerization kettle, vacuum dehydration at 120℃ for 4 hours, vacuum degree ≤-0.08MPa; cooled to 80℃, 13 parts of chain extender is added, polymerized for 3 hours; defoaming agent 0.5 parts, drying agent 0.2 parts are added, vacuum degassing stirring for 15min, vacuum degree ≤-0.08MPa, stirring speed 100-300rpm.

[0058] (3) Self-repairing seed preparation

[0059] Under the nitrogen atmosphere, 40 parts of activated activated carbon is added to 60 parts of self-repairing liquid under stirring, uniformly mixed, stirring speed 1000rpm, grinding fineness ≤1000nm.

[0060] (4) Self-repairing seed coating

[0061] Take 30 parts of paraffin into the kettle, heat to 80℃, and add 70 parts of seed under stirring at 300rpm, mix and stir uniformly, emulsify for 1 hour by colloid mill at 2000rpm. The emulsification method includes but is not limited to colloid mill, microwave emulsification, vacuum emulsification, pipeline emulsification, ultrasonic emulsification, etc.

[0062] (5) Single-shell self-repairing capsule preparation

[0063] The self-repairing seed emulsion is transported to the atomization chamber, the temperature in the atomization chamber is-5℃, the particle size of the self-repairing paraffin coated particles is ≤100μm, the paraffin coated particles are fluidized and coated on the surface of the particles with self-repairing liquid, and are solidified in air for 24 hours to obtain single-shell self-repairing capsules.

[0064] (6) Self-repairing waterproof coating preparation

[0065] Under the nitrogen atmosphere at 25℃, 49 parts of self-repairing liquid, 40 parts of spherical silica powder, 10 parts of single-shell self-repairing capsule, 0.1 parts of defoaming agent, and 0.9 parts of wetting dispersant are put into the kettle, mixed uniformly, and stirred at 500rpm. Stir for 30 minutes. Among them, the application of silica powder filler is mainly to reduce the cost. The self-repairing waterproof coating prepared by the present application contains self-repairing waterproof double-shell capsules, and the structural schematic diagram is shown in Figure 1 .

[0066] Table 2 shows the influence of different raw material ratios of self-repairing materials on product performance. Different from step (2) of example 1, other steps and parameters are the same as example 1.

[0067] Table 2 shows the influence of different raw material ratios of self-repairing materials on product performance. Different from step (2) of example 1, other steps and parameters are the same as example 1.

[0068]

[0069] Table 3 is to study the influence of different proportions of activated activated carbon and self-repairing liquid on product performance, different from step (3) of example 1, other steps and parameters are the same as example 1.

[0070] Table 3 is to study the influence of different proportions of activated activated carbon and self-repairing liquid on product performance, different from step (3) of example 1, other steps and parameters are the same as example 1.

[0071] Material name Example 1 Example 5 Example 6 Comparative example 3 Comparative example 4 Self-repairing liquid 60 10 30 90 95 Activated activated carbon 40 90 70 10 5

[0072] Table 4 is to study the influence of different proportions of raw materials of self-repairing capsule and single-component polyurethane curing layer on product performance, different from step (6) of example 1, other steps and parameters are the same as example 1.

[0073] Table 4 is to study the influence of different proportions of raw materials of self-repairing capsule and single-component polyurethane curing layer on product performance, different from step (6) of example 1, other steps and parameters are the same as example 1.

[0074]

[0075] Effect example

[0076] The commercially available waterproof coating is a single-component polyurethane waterproof coating of Feigao Molecular New Material Co., Ltd., and the model is I-B. The performance comparison between the present application and the commercially available material is shown in Table 1.

[0077] Table 5 is the performance comparison between the present application and the commercially available material.

[0078]

[0079] The salt mist resistance detection method is GB / T1771-2007 Determination of resistance to neutral salt spray of pigments and varnishes; the impermeability, waterproofness, tensile strength, paint film preparation and performance test detection method is GB / T19250-2013 Polyurethane waterproof coating.

[0080] Paint film preparation: multiple brushing on a glass plate (the glass plate is first waxed), the paint film thickness is 1.5 mm, standing for 7 days, and then placing in a 50±2℃ oven for 24 hours, taking out and placing for 3 hours to cool to room temperature 23±2℃.

[0081] The impermeability is that the paint film has no leakage under 0.3Mpa for 30 minutes; the waterproofness is that the paint film is cut with a wallpaper knife to form an "X" type 10cm scratch, the scratch exposes the substrate, immediately placed in water, and after standing for 30 minutes, the waterproofness is tested under 0.3Mpa, and the paint film has no leakage for 30 minutes. The test results of the product performance of the coating prepared in examples 1-14 are shown in Table 6.

[0082] Table 6 is the performance test of the product.

[0083]

[0084] As can be seen from Examples 1 to 4 and Comparative Examples 1 to 2, as the content of chlorinated paraffin in the self-repairing liquid increases, the waterproof performance improves, but the tensile strength increases with the increase of the paraffin content, but the tensile rate decreases with the increase of the paraffin component. As can be seen from Examples 1, 5 to 6 and Comparative Examples 3 to 4, when the activated carbon and the self-repairing liquid are in different proportions, the granulation of Comparative Examples 3 and 4 is difficult. As can be seen from Examples 1, 7 and 8, as the content of the self-repairing capsule increases, after the self-repairing coating is damaged, the waterproof performance improves, and the reason for the improvement is that the self-repairing liquid released by the self-repairing capsule increases, and the self-repairing ability of the paint film is improved. Therefore, by selecting activated carbon with high porosity or increasing the content of the capsule, excellent self-repairing function can be obtained.

[0085] Unless otherwise specifically indicated, all raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by existing methods. The above specific examples further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a self-repairing waterproof coating, characterized in that: It includes the following steps: S1. The raw materials of the self-repairing material are synthesized to obtain a self-repairing liquid; the raw materials of the self-repairing material include 30 to 53 parts of polyether, 42 to 58 parts of chlorinated paraffin, 0.1 to 0.9 parts of a wetting and dispersing agent, 10 to 20 parts of a chain extender, 0.1 to 1.0 parts of a defoaming agent, and 0.1 to 0.8 parts of a drying agent; S2. Add activated carbon to the self-repairing solution, stir and grind until uniform, with the mass ratio of self-repairing solution to activated carbon being 1:0.5-9, to obtain self-repairing seeds; S3. Add the self-repairing seeds to the paraffin liquid and stir and emulsify. The mass ratio of the paraffin liquid to the self-repairing seeds is 1:1.3~3.6 to obtain a paraffin-coated self-repairing seed emulsion; S4. The paraffin-coated self-repairing seed emulsion is atomized and granulated and solidified to obtain a single-shell self-repairing capsule; S5. Adding a single-shell self-repairing capsule and a single-component polyurethane cured layer of raw materials, the mass ratio of the single-shell self-repairing capsule and the single-component polyurethane cured layer of raw materials is 1: 1 to 15, and mixing to obtain a self-repairing waterproof coating containing a self-repairing double-shell capsule; The raw materials of the single-component polyurethane curing layer include 40-60 parts of self-repairing liquid, 30-50 parts of spherical silicon powder, 0.05-0.5 parts of defoaming agent, and 0.5-1.5 parts of wetting dispersant.

2. The method for preparing the self-repairing waterproof coating according to claim 1, wherein: The polyether is a polyether polyol; And / or, the defoaming agent includes a silicon-containing solvent-type defoaming agent and a silicon-free solvent-type defoaming agent; And / or, the chain extender comprises isocyanate.

3. The method for preparing the self-repairing waterproof coating according to claim 1, wherein: The step S1 also includes a pre-treatment operation, wherein the pre-treatment operation is to dry the activated carbon at 500-700° C. for 3-5 hours under nitrogen protection, and then cool it to room temperature to obtain activated activated carbon; In S1, the synthesis method comprises mixing polyether, chlorinated paraffin and a wetting and dispersing agent and then vacuum dehydrating the mixture, adding isocyanate after cooling to carry out polymerization, and then adding a defoaming agent and a drying agent to carry out vacuum degassing.

4. The method for preparing the self-repairing waterproof coating according to claim 3, wherein: In S1, the activated carbon has a porosity of ≥50% and a fineness of ≥300 mesh; In S1, the vacuum degree of the vacuum dehydration is ≤-0.08 MPa; the temperature of the vacuum dehydration is 110-130°C; In S1, the temperature after cooling is 70-90°C; In S1, the polymerization time is 2 to 5 hours; In S1, the vacuum degassing time is 10-20 min, the stirring speed of the vacuum degassing is 100-300 rpm, and the vacuum degree of the vacuum degassing is ≤-0.08 MPa.

5. The method for preparing the self-repairing waterproof coating according to claim 1, wherein: In S2, the stirring and grinding speed is 700-1500 rpm; In S2, the uniform standard is grinding fineness to ≤1000 nm; The S2 and S5 are carried out under nitrogen protection.

6. The method for preparing the self-repairing waterproof coating according to claim 1, wherein: In S3, the paraffin liquid is obtained by heating and melting paraffin, and the heating temperature is 80° C. In S3, the stirring and emulsification time is 0.5-2 h, and the stirring speed of the stirring and emulsification is 1700-2500 rpm.

7. The method for preparing the self-repairing waterproof coating according to claim 1, wherein: In S4, the temperature of the atomization granulation is -8~0°C; In S4, the particle size of the granulation is ≤100 μm; In S4, the curing is carried out in air, and the curing time is 18 to 30 hours; In S5, the stirring speed of the mixing is 150-250 rpm, and the mixing time is 20-45 min.

8. The self-repairing waterproof coating obtained by the preparation method according to any one of claims 1 to 7, characterized in that: The self-repairing waterproof coating has a tensile strength of ≥2.0 MPa and a breaking elongation of ≥800%.

9. A self-repairing waterproof double-shell capsule, characterized in that: Present in the self-repairing waterproof coating prepared by the preparation method of the self-repairing waterproof coating according to any one of claims 1 to 7, or the self-repairing waterproof coating according to claim 8; The self-repairing waterproof double-shell capsule is composed of a capsule inner core, a capsule inner shell and a capsule outer shell from the inside to the outside; The inner core of the capsule is a self-repairing seed composed of activated carbon adsorbed self-repairing material, the inner shell of the capsule is a paraffin sealing layer, and the outer shell of the capsule is a single-component polyurethane solidified layer.

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