CN110358345B

CN110358345B - Microcapsule type antifouling agent and preparation method thereof, antifouling coating and preparation method thereof

Info

Publication number: CN110358345B
Application number: CN201910772696.2A
Authority: CN
Inventors: 周峰; 刘辉; 杨武芳; 裴小维
Original assignee: Lanzhou Institute of Chemical Physics LICP of CAS
Current assignee: China Kemeisi Nuclear Coatings (Yantai) Co.,Ltd.
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2020-05-12
Anticipated expiration: 2039-08-21
Also published as: CN110358345A

Abstract

The invention provides a microcapsule type antifouling agent and a preparation method thereof, an antifouling paint and a preparation method thereof, and belongs to the technical field of marine antifouling paints. The microcapsule type antifouling agent provided by the invention has the wall material of polydopamine, and the core material of the microcapsule type antifouling agent comprises chamaejasmine and an oily solvent. The stellera chamaejasme in the microcapsule antifouling agent provided by the invention can be extracted from stellera chamaejasme, is environment-friendly, has a slow release function, and can prolong the antifouling period when being used for antifouling paint. In addition, the invention uses chamaejasmine as an active component, the obtained antifouling agent has broad antifouling spectrum and good inhibition effect on the growth of navicula and porphyridium, and the preparation method of the microcapsule type antifouling agent is simple and is suitable for industrial application.

Description

Microcapsule type antifouling agent and preparation method thereof, antifouling coating and preparation method thereof

Technical Field

The invention relates to the technical field of marine antifouling paints, in particular to a microcapsule type antifouling agent and a preparation method thereof, and an antifouling paint and a preparation method thereof.

Background

Marine biofouling refers to the act of undesirable colonization by marine organisms (e.g., bacteria, algae, molluscs, etc.) on surfaces immersed in seawater, which can occur on any surface immersed in seawater. Such behavior can pose a highly undesirable detriment to the development of marine-related fields. For example, the attachment of fouling organisms can accelerate corrosion of the hull surface; the boundary resistance between the ship and the fluid is increased, the sailing speed is reduced, and further the consumption of fuel is increased; in addition, different species of marine organisms are attached to the surface of the ship body and can freely migrate in different sea areas, so that certain threat is brought to the ecological balance of the sea areas.

In order to avoid and reduce the series of hazards caused by marine fouling organisms, the marine artificial facilities are scientifically, reasonably and safely designed and built, and the antifouling technology and means are also needed to be selected and optimized economically and effectively. In the 60's of the 20 th century, tributyltin (TBT) -doped self-polishing antifouling coatings began to be used and were found to have a stable and effective antifouling effect, the mechanism of action of which was that tributyltin could be effectively released from the coating and inhibited fouling, achieving an effective antifouling effect of up to 5 years. However, since the organic tin compound affects calcium metabolism of oysters, induces gastropod-like aberration of marine products, accumulates in marine organisms, and exerts an adverse effect on human health through a food chain, it is internationally recommended to prohibit the use of an antifouling coating containing an organic tin compound on the surface of ships in 1 month 2008. Therefore, the development of new, highly effective, low-toxicity, environmental-friendly antifouling agents has become an urgent problem and research focus in the world.

Although some substances with antifouling effect are found in marine organisms, the contents of the substances in the marine organisms are relatively small, the structures are relatively complex, and the substances are inconvenient to deeply develop and widely apply. Based on the inspiration of the research on the chemical defense function of the terrestrial plants, the method is searched from terrestrial plant resources with various types, wide distribution and convenient material taking, and the antifouling component which is efficient to pests, safe to non-target organisms and easy to decompose and the decomposition product of which has no harm to the environment is a good choice for replacing TBT. For example, chinese patent publication No. CN1709997A reports that an antifouling paint using capsaicin as an antifouling agent has a good antifouling effect, but capsaicin has low solubility in an organic solvent and cannot be treated by a slow release technique, which results in a high release rate of capsaicin and a short antifouling time. Therefore, there is an urgent need to find new natural antifouling active substances for preparing antifouling agents with a slow release function.

Disclosure of Invention

The invention aims to provide a microcapsule type antifouling agent and a preparation method thereof, and an antifouling coating and a preparation method thereof.

In order to achieve the above object, the present invention provides the following technical solutions:

a microcapsule type antifouling agent comprises wall material of polydopamine, and core material including chamaejasmine and oily solvent.

Preferably, the oily solvent is at least one of n-butanol, ethanol and ethylene glycol.

Preferably, the average particle size of the microcapsule type antifouling agent is 150-400 nm, the average wall thickness is 25-40 nm, and the loading capacity of the chamaejasmine is 70-80%.

The invention also provides a preparation method of the microcapsule antifouling agent in the technical scheme, which comprises the following steps:

mixing an alkaline buffer solution with a surfactant to obtain a water phase;

mixing chamaejasmine and an oily solvent to obtain an oil phase;

and mixing the water phase and the oil phase, adding dopamine hydrochloride, and performing oxidation autopolymerization reaction to obtain the microcapsule antifouling agent.

Preferably, the alkaline buffer solution is a Tris buffer solution with the pH value of 8-9, the surfactant is at least one of cetyltrimethylammonium chloride and cetyltrimethylammonium bromide, and the dosage ratio of the surfactant to the alkaline buffer solution is 1g: 45-55 mL.

Preferably, the volume ratio of the water phase to the oil phase is 10-30: 1.

Preferably, the mass ratio of the chamaejasmine to the dopamine hydrochloride is 1: 5-20.

The invention also provides an antifouling paint which comprises the following components in percentage by mass: 30-60% of acrylic self-polishing resin, 2-10% of microcapsule type antifouling agent, 20-40% of organic solvent, 10-30% of pigment and filler and 1-3% of auxiliary agent, wherein the microcapsule type antifouling agent is the microcapsule type antifouling agent in the technical scheme or the microcapsule type antifouling agent obtained by the preparation method in the technical scheme.

Preferably, the acrylic self-polishing resin includes at least one of a zinc acrylate type self-polishing resin, a copper acrylate type self-polishing resin, and a silicon acrylate type self-polishing resin.

The invention also provides a preparation method of the antifouling paint in the technical scheme, which is characterized by comprising the following steps:

mixing acrylic self-polishing resin, an organic solvent, a pigment filler and an auxiliary agent, grinding, and adding a microcapsule type antifouling agent to obtain the antifouling paint.

The invention provides a microcapsule type antifouling agent, wherein the wall material is polydopamine, and the core material comprises chamaejasmine and an oily solvent. The stellera chamaejasme in the microcapsule antifouling agent provided by the invention can be extracted from stellera chamaejasme, is environment-friendly, has a slow release function, and can prolong the antifouling period when being used for antifouling paint. In addition, the antifouling agent prepared by the invention has broad antifouling spectrum, has good inhibition effect on the growth of navicula and porphyridium, and the preparation method of the microcapsule type antifouling agent is simple and is suitable for industrial application.

The invention also provides an antifouling paint which comprises the following components in percentage by mass: 30-60% of acrylic self-polishing resin, 2-10% of microcapsule type antifouling agent, 20-40% of organic solvent, 10-30% of pigment and filler and 1-3% of auxiliary agent, wherein the microcapsule type antifouling agent is the microcapsule type antifouling agent in the technical scheme or the microcapsule type antifouling agent obtained by the preparation method in the technical scheme. The antifouling paint provided by the invention has broad antifouling spectrum, and when the antifouling paint is sprayed on a sample plate containing epoxy primer and subjected to a static hanging plate experiment, the surface is still clean after being placed for 8 months, only sea mud is adhered to the surface, so that fewer fouling points are formed, no large marine fouling organisms are attached, and the antifouling performance is excellent.

Drawings

FIG. 1 is an SEM photograph of a microcapsule-type antifouling agent obtained in example 1;

FIG. 2 fluorescence quenching diagrams of chamaejasmine against navicula and porphyridium;

FIG. 3 is a fluorescence image of porphyridium on the surface of the coating layer of the antifouling paint obtained in example 4 and the blank antifouling paint;

FIG. 4 is a graph of the results of a shallow sea static hang plate experiment using a panel coated with the antifouling paint obtained in example 4 and an epoxy blank panel.

Detailed Description

The invention provides a microcapsule type antifouling agent, wherein the wall material is polydopamine, and the core material comprises chamaejasmine and an oily solvent. In the present invention, the chamaejasmine has the structure shown in formula I:

in the present invention, the stellera chamaejasme can be extracted from stellera chamaejasme plants. The polydopamine in the microcapsule antifouling agent provided by the invention is used as a wall material, chamaejasmine dissolved in an oily solvent is wrapped inside the wall material, and the chamaejasmine is slowly released in the using process, so that the aim of prolonging the antifouling period is fulfilled.

In the present invention, the oily solvent is preferably at least one of n-butanol, ethanol and ethylene glycol. In the present invention, the oily solvent may dissolve chamaejasmine to form an oil phase.

In the present invention, the average particle size of the microcapsule-type antifouling agent is preferably 150 to 400nm, more preferably 200 to 350nm, and most preferably 250 to 300 nm; the average wall thickness is preferably 25-40 nm, more preferably 30-35 nm, and the loading capacity of the chamaejasmine is preferably 70-80%, more preferably 73-78%.

mixing an alkaline buffer solution with a surfactant to obtain a water phase;

mixing chamaejasmine and an oily solvent to obtain an oil phase;

The invention mixes alkaline buffer solution and surface activator to obtain water phase.

In the invention, the alkaline buffer solution is a Tris buffer solution with the pH value of 8-9, the preparation method of the Tris buffer solution is not particularly limited, and the proper pH value can be obtained by adopting the conventional preparation method in the field. In the invention, the Tris buffer solution can provide alkaline conditions for subsequent oxidative autopolymerization reaction, so that the dopamine hydrochloride can be dehydrochlorinated to generate oxidative autopolymerization reaction to form a polydopamine microcapsule wall.

In the invention, the surfactant is preferably at least one of cetyltrimethylammonium chloride and cetyltrimethylammonium bromide, and the dosage ratio of the surfactant to the alkaline buffer solution is preferably 1g: 45-55 mL, and more preferably 1g:50 mL.

The invention mixes the chamaejasmine and the oily solvent to obtain the oil phase.

The source of the chamaejasmine is not particularly limited, and in the embodiment of the invention, the chamaejasmine is preferably extracted from the stellera chamaejasme by a method disclosed in the prior art, such as an extraction method disclosed in research on chemical components and biological activity of stems and leaves of the stellera chamaejasme (Leilium, a university graduate of Lanzhou chemical and physical research institute of Chinese academy of sciences, 2013,06) in the prior art.

In the invention, the dosage ratio of the chamaejasmine and the oily solvent is preferably 1g: 90-110 mL, and more preferably 1g:100 mL.

After obtaining the water phase and the oil phase, the invention mixes the water phase and the oil phase, adds dopamine hydrochloride, and carries out oxidation autopolymerization reaction to obtain the microcapsule type antifouling agent. In the invention, after the water phase and the oil phase are mixed, oil-in-water emulsion droplets are formed under the action of a surfactant, and after dopamine hydrochloride is added, in a weakly alkaline environment, after the dopamine hydrochloride removes hydrogen chloride, an oxidation self-polymerization reaction is carried out, and the emulsion droplets are wrapped on the surface to form a microcapsule wall.

In the invention, the volume ratio of the water phase to the oil phase is preferably 10-30: 1, and more preferably 15: 1.

In the invention, the mass ratio of the chamaejasmine to the dopamine hydrochloride is preferably 1: 5-20, and more preferably 1: 10-15.

In the invention, the temperature of the oxidative self-polymerization reaction is preferably room temperature, the room temperature is preferably 10-40 ℃, the time is preferably 20-26 h, and more preferably 22-24 h; stirring is preferably maintained in the oxidation self-polymerization reaction process, and the rotating speed of stirring is preferably 300-500 r/min, and more preferably 350-450 r/min. In the present invention, the above-mentioned rotation speed is advantageous for obtaining the microcapsule type antifouling agent having a uniform particle diameter.

After the oxidative autopolymerization reaction is completed, the method preferably performs centrifugal separation, and sequentially washes and dries the obtained crude microcapsule type antifouling agent to obtain the microcapsule type antifouling agent.

In the invention, the rotation speed of centrifugal separation is preferably 9000-11000 r/min, and more preferably 10000 r/min; the time is preferably 8-12 min, and more preferably 10 min. In the present invention, the centrifugal separation serves to separate the microcapsule-type antifouling agent from the mixed system.

In the present invention, the washing detergent is preferably water, more preferably deionized water; the washing mode is not particularly limited, and a conventional washing mode is adopted, in the embodiment of the invention, the washing is preferably to disperse the microcapsule type anti-fouling agent crude product obtained by centrifugation in water, then to carry out centrifugal separation, and to complete one washing, and the washing frequency is preferably 3-5 times; the rotation speed of centrifugal separation is preferably 9000-11000 rpm, and more preferably 10000 rpm; the time is preferably 8-12 min, and more preferably 10 min.

In the invention, the drying is preferably vacuum drying, and the temperature of the vacuum drying is preferably 40-60 ℃, and more preferably 45 ℃. The vacuum drying time is not specially limited, and a product with constant weight can be obtained.

In the invention, the antifouling paint comprises 30-60% by mass of acrylic self-polishing resin, preferably 40-50%; the acrylic self-polishing resin comprises at least one of zinc acrylate type self-polishing resin, copper acrylate type self-polishing resin and silicon acrylate type self-polishing resin; the solid content of the acrylic self-polishing resin is preferably 45-55%, and more preferably 50%. In the invention, the acrylic self-polishing resin is a base resin of the antifouling paint, mainly plays a role of adhesion, and can be slowly hydrolyzed in seawater to form a hydrophilic chain segment which is gradually removed from the surface as a surface resin, so that layer-by-layer peeling and polishing are realized, and the antifouling effect of the antifouling paint is further improved.

In the invention, the antifouling paint comprises 2-10% of microcapsule type antifouling agent, preferably 5-8% by mass; the microcapsule-type antifouling agent is the microcapsule-type antifouling agent according to the above technical scheme or the microcapsule-type antifouling agent obtained by the preparation method according to the above technical scheme.

In the invention, the antifouling paint comprises 20-40% by mass of an organic solvent, preferably 25-35%; the organic solvent is preferably a mixture of toluene and dimethylformamide, and the mass ratio of the toluene to the dimethylformamide is preferably 1-2: 1.

In the invention, the antifouling paint comprises 10-30% of pigment and filler, preferably 15-25% of pigment and filler by mass percent; the pigment and filler is preferably at least three of zinc oxide, iron oxide red, organic bentonite, precipitated barium sulfate and talcum powder. In the invention, the pigments and fillers play a role in enhancing the physical and chemical properties of the paint film such as covering power, hardness and the like, and the three pigments and fillers are matched to ensure that the overall physical and chemical properties of the paint film are good.

In the invention, the antifouling paint comprises 1-3% of an auxiliary agent by mass percent; the auxiliary agent is preferably a coating auxiliary agent of German Bick company, and more preferably comprises a BYK104S wetting dispersant, a BYK354 flatting agent, a BYK052 antifoaming agent and a BYK410 anti-settling agent; the mass ratio of the BYK104S wetting dispersant to the BYK354 flatting agent to the BYK052 defoaming agent to the BYK410 anti-settling agent is preferably 2:1:1: 1.

The invention also provides a preparation method of the antifouling paint in the technical scheme, which comprises the following steps:

In the present invention, the particle size of the particulate matter in the slurry obtained by the grinding is preferably 30 μm or less.

The grinding parameters are not particularly limited, and the material with the required particle size can be obtained.

After addition of the microcapsule-type antifouling agent, stirring is preferably performed in the present invention. The stirring conditions are not particularly limited, and the antifouling paint can be uniformly mixed.

The present invention provides a microcapsule-type antifouling agent and a method for producing the same, an antifouling paint and a method for producing the same, which are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.

Example 1

Mixing 150mL of Tris buffer solution with the pH value of 8.5 with 3g of hexadecyltrimethylammonium chloride to obtain a water phase;

mixing 10mL of n-butanol with 0.1g of chamaejasmine to obtain an oil phase;

and mixing the water phase and the oil phase, adding 1g of dopamine hydrochloride, stirring at room temperature (25 ℃) for 24 hours at a rotating speed of 400rpm, centrifuging at a rotating speed of 10000rpm for 10 minutes to obtain a microcapsule type antifouling agent crude product, washing the microcapsule type antifouling agent crude product obtained by centrifuging with deionized water for 3 times, and performing vacuum drying at 45 ℃ to obtain the microcapsule type antifouling agent.

The ultraviolet absorbance of the chamaejasmine in the microcapsule antifouling agent is tested by using an ultraviolet visible spectrophotometer, the concentration of the chamaejasmine is obtained by the ultraviolet absorbance of the chamaejasmine, specifically, the absorbance of the chamaejasmine under different concentrations is tested to obtain a standard curve about the concentration and the absorbance of the chamaejasmine, then the absorbance of the chamaejasmine released by the microcapsule is obtained by testing, the concentration of the chamaejasmine is obtained by the standard curve, then the mass of the chamaejasmine is calculated, and the load capacity of the chamaejasmine is 73% by dividing the mass of the microcapsule by the mass of the chamaejasmine.

The morphology of the microcapsule-type antifouling agent obtained in this example was characterized, and the results are shown in fig. 1. As is clear from FIG. 1, the microcapsule-type antifouling agent obtained in the present example has a uniform particle diameter, and the average particle diameter is 255 nm.

The average wall thickness of the microcapsule antifouling agent obtained in the present example was 30nm as measured by a transmission electron microscope.

Example 2

A microcapsule type antifouling agent was prepared according to the method of example 1, except that the amount of dopamine hydrochloride was 2 g.

The loading of chamaejasmine was 75% as measured in example 1.

The average particle size of the microcapsule-type antifouling agent obtained in the present example was 270nm as measured by a scanning electron microscope, and the average wall thickness of the microcapsule-type antifouling agent obtained in the present example was 34nm as measured by a transmission electron microscope.

Example 3

Microcapsule type antifouling agent was prepared according to the method of example 1 except that the amount of n-butanol was 20mL and the amount of chamaejasmine was 0.2 g.

The loading of chamaejasmine was 75% as measured in example 1.

The average particle size of the microcapsule-type antifouling agent obtained in the present example was 260nm as measured by a scanning electron microscope, and the average wall thickness of the microcapsule-type antifouling agent obtained in the present example was 32nm as measured by a transmission electron microscope.

Example 4

50g of zinc acrylate self-polishing resin with the solid content of 50 percent, 15g of pigment and filler (wherein zinc oxide, organic bentonite and iron oxide red are 5g respectively), 1.5g of auxiliary agent (wherein BYK104S wetting dispersant is 0.6g, BYK354 flatting agent is 0.3g, BYK052 antifoaming agent is 0.3g, BYK410 anti-settling agent is 0.3g), 18.5g of toluene and 10g of dimethylformamide are mixed, the mixture is placed in a planetary ball mill to be ground for 5 hours, the fineness is checked to be less than 30 mu m, then discharging is carried out, 5g of the capsule type antifouling agent obtained in the example 1 is added, and the capsule type antifouling agent is stirred for 20min at the rotating speed of 1000rpm, so that the antifouling.

Broad spectrum test for anti-fouling of chamaejasmine

Test of the inhibitory effect of chamaejasmine on navicula: the chamaejasmine is dispersed in a solution containing navicula, wherein the initial fluorescence intensity of the solution is 655, ethanol solutions containing chamaejasmine with different concentrations are prepared, and the fluorescence intensity of the navicula is tested when the ethanol solutions are placed for 12 hours, and the result is shown as A in figure 2, and the fluorescence intensity of the navicula is obviously reduced along with the increase of the concentration of the chamaejasmine.

Test of the inhibitory effect of chamaejasmine on porphyridium: by using the above method, navicula was replaced with porphyridium, and the quenching behavior of porphyridium by chamaejasmine was tested, and the result is shown as B in fig. 2.

As can be seen from fig. 2, when no chamaejasmine was added (0mg/mL), the fluorescence intensity of the solution was higher, indicating that the concentration of algae was high, and after chamaejasmine was added, the fluorescence intensity of navicula and porphyridium gradually decreased with the increase of chamaejasmine concentration, indicating that chamaejasmine has an inhibitory effect on both navicula and porphyridium, indicating that it has a broad-spectrum antifouling effect.

Testing the slow release performance of the microcapsule type antifouling agent:

the microcapsule-type antifouling agent obtained in example 1 was dispersed in a mixture of ethanol and Tris buffer solution at a volume ratio of 3:7, the pH of the Tris buffer solution was 8.4, and the concentration of the microcapsule-type antifouling agent in the mixture was 0.02mg/mL, and the concentration of chamaejasmine in the mixture was measured at regular intervals. The results are shown in Table 1.

TABLE 1 test results of sustained Release Performance of microencapsulated antifouling Agents

As can be seen from table 1, the concentration of the euphorbia fischeri in the mixed solution increases slowly with the time, which shows that the microcapsule-type antifouling agent provided by the present invention has a slow release function and can prolong the antifouling effect.

Antifouling performance test of the antifouling paint:

blank control antifouling paint: an antifouling paint was prepared according to the method of example 4 without adding the microcapsule type antifouling agent.

(1) Example 4 and the blank antifouling paint were each sprayed onto a glass slide and cured for 12h at room temperature. The two coatings were then placed in porphyridium liquid, and the number of algae on the surface was observed under a fluorescence microscope after 24 hours, and the result is shown in fig. 3, wherein a is the surface of the blank antifouling coating, b is the surface of the antifouling coating obtained in example 4, and the bright point in the figure is porphyridium. As can be seen from fig. 3, the antifouling coating of example 4 has a significantly lower density of algae on the surface relative to the blank antifouling coating. This shows that the antifouling paint provided in example 4 has an inhibitory effect on the growth of porphyridium.

(2) The antifouling paint obtained in the example 4 is sprayed on a low carbon steel plate (150X 250X 2mm) with epoxy anticorrosive primer to prepare a sample plate, and after the sample plate is fully dried at room temperature, a shallow sea static hanging plate test is carried out; and simultaneously selecting a steel plate with the same specification as a blank (marked as an epoxy blank), and coating an epoxy anticorrosive primer on the surface of the steel plate. Placing the two sample plates in the depth of 1 meter under the sea to carry out static real sea hanging plate tests, wherein the test time is 10 months to 06 months in 2018, and the test field is as follows: shenzhen sea area.

The two templates were photographed at 4 months and 8 months of static hanging, respectively, and the surface morphology of the two templates was observed, with the results shown in fig. 4. After 4 months of epoxy blank sample plate shallow sea static hanging plate, various large fouling organisms are attached to the surface of the sample plate, mainly barnacles, mussels and limestans are used as main materials, fouling is serious, and after 4 months of the sample plate static hanging plate sprayed with the antifouling paint obtained in the embodiment 4, a paint film on the surface of the sample plate is intact, no foaming and dropping occur, and the surface of the paint film is clean; after 8 months of hanging the board, the blank model surface of epoxy is stained more heavily, has multiple fouling organism to adhere to, forms the fouling community, and the surface that has sprayed the antifouling coating that has obtained in embodiment 4 is still clean, only has the sea mud to adhere to the surface, and the fouling point is few, and no large-scale marine fouling organism adheres to, and antifouling performance is excellent. Therefore, in a research period, the antifouling paint provided by the invention has excellent antifouling performance, shows a broad-spectrum antifouling effect and completely does not contain cuprous oxide.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A microcapsule antifouling agent is characterized in that the wall material is polydopamine, and the core material comprises chamaejasmine and an oily solvent.

2. The microcapsule-type antifouling agent according to claim 1, wherein the oily solvent is at least one of n-butanol, ethanol, and ethylene glycol.

3. The microcapsule-type antifouling agent according to claim 1 or 2, wherein the microcapsule-type antifouling agent has an average particle diameter of 150 to 400nm and an average wall thickness of 25 to 40nm, and the loading amount of chamaejasmine in the microcapsule-type antifouling agent is 70 to 80% by mass.

4. The method for producing a microcapsule-type antifouling agent according to any one of claims 1 to 3, comprising the steps of: mixing an alkaline buffer solution with a surfactant to obtain a water phase; mixing chamaejasmine and an oily solvent to obtain an oil phase; and mixing the water phase and the oil phase, adding dopamine hydrochloride, and performing oxidation autopolymerization reaction to obtain the microcapsule antifouling agent.

5. The preparation method according to claim 4, wherein the alkaline buffer solution is a Tris buffer solution with a pH value of 8-9, the surfactant is at least one of cetyltrimethylammonium chloride and cetyltrimethylammonium bromide, and the dosage ratio of the surfactant to the alkaline buffer solution is 1g: 45-55 mL.

6. The method according to claim 4 or 5, wherein the volume ratio of the water phase to the oil phase is 10-30: 1.

7. The preparation method according to claim 4, wherein the mass ratio of the chamaejasmine to the dopamine hydrochloride is 1: 5-20.

8. The antifouling paint is characterized by comprising the following components in percentage by mass: 30-60% of acrylic self-polishing resin, 2-10% of microcapsule type antifouling agent, 20-40% of organic solvent, 10-30% of pigment and filler and 1-3% of auxiliary agent, wherein the microcapsule type antifouling agent is the microcapsule type antifouling agent as defined in any one of claims 2-4 or the microcapsule type antifouling agent obtained by the preparation method as defined in any one of claims 5-7.

9. The antifouling paint according to claim 8, wherein the acrylic self-polishing resin comprises at least one of a zinc acrylate type self-polishing resin, a copper acrylate type self-polishing resin, and a silicon acrylate type self-polishing resin.

10. A method for producing an antifouling paint according to claim 8 or 9, comprising the steps of: mixing acrylic self-polishing resin, an organic solvent, a pigment filler and an auxiliary agent, grinding, and adding a microcapsule type antifouling agent to obtain the antifouling paint.