BIT-amino silicone oil modified polyaspartic acid ester polyurea coating and its preparation method and application

Abstract

The present invention discloses a BIT-aminosilicone oil-modified polyaspartic acid ester polyurea coating, a preparation method thereof, and an application thereof. The coating comprises a BIT-grafted aminosilicone oil prepolymer, a polyether prepolymer, and a polyaspartic acid ester. The preparation method comprises: a. mixing a 1,2-benzisothiazol-3-one solution and an isophorone dicyanate solution to obtain a BFM solution; b. mixing and dissolving aminosilicone oil, tetrahydrofuran, and the BFM solution, reacting at room temperature until all isocyanates in the mixed system have reacted, then adding isophorone dicyanate to achieve a 10% by mass NCO percentage in the mixed system to obtain a BIT-grafted aminosilicone oil prepolymer; and c. mixing and curing the polyether prepolymer, the BIT-grafted aminosilicone oil prepolymer, and the polyaspartic acid ester to obtain a BIT-aminosilicone oil-modified polyaspartic acid ester polyurea coating. The present invention has active antifouling and excellent fouling and desorption properties.

Description

Technical Field

[0001] The present invention relates to a modified polyurea coating, in particular to a BIT-amino silicone oil modified polyaspartic acid ester polyurea coating and a preparation method and application thereof. Background Art

[0002] Marine biofouling is a difficult problem that must be faced in the process of resource development. Currently, the application of marine antifouling coatings is the most economical and effective means of preventing and controlling marine biofouling. Self-polishing coatings and fouling-releasing coatings are the most studied antifouling coatings. However, the antifouling effect of self-polishing coatings comes from antifouling agents, which are released into the environment after hydrolysis to avoid the attachment of marine fouling organisms. Mainstream antifouling agents are mostly heavy metal ions. The release of these heavy metal ions will cause them to accumulate in organisms, causing impacts on the ecosystem and a significant impact on the environment. Fouling-releasing coatings avoid the attachment of fouling organisms through water shear force and low surface energy. Although they do not affect the environment, their antifouling ability under static conditions is limited, their mechanical properties are generally deviated, their adhesion to the substrate is weak, they are easily damaged, and they cannot better adapt to the marine environment. Therefore, the development of coatings that combine antifouling performance with resistance to damage has become a new development trend. Summary of the Invention

[0003] The present invention aims to provide a BIT-amino silicone oil modified polyaspartic acid ester polyurea coating and its preparation method and application. The coating of the present invention has active antifouling and excellent fouling desorption performance.

[0004] The technical solution of the present invention is: a BIT-amino silicone oil modified polyaspartic acid ester polyurea coating, comprising a BIT-grafted amino silicone oil prepolymer with R (NCO / NH) = 1.01 to 1.1, a polyether prepolymer and polyaspartic acid ester.

[0005] The aforementioned BIT-amino silicone oil modified polyaspartic acid ester polyurea coating comprises the following raw materials in parts by mass: 3.84 parts of amino silicone oil prepolymer grafted with BIT, 15.33 parts of polyether prepolymer and 10 parts of polyaspartic acid ester.

[0006] In the aforementioned BIT-amino silicone oil modified polyaspartic acid ester polyurea coating, the amino silicone oil prepolymer grafted with BIT comprises BFM, amino silicone oil, tetrahydrofuran and isophorone dicyanate so that the mass percentage of NCO in the mixed solution system is 10%.

[0007] In the aforementioned BIT-amino silicone oil-modified polyaspartic acid ester polyurea coating, the BFM includes 1,2-benzisothiazol-3-one, isophorone dicyanate and tetrahydrofuran, and the mass ratio of 1,2-benzisothiazol-3-one, isophorone dicyanate and tetrahydrofuran is (5-7: (6-10): (40-60).

[0008] In the aforementioned BIT-amino silicone oil modified polyaspartic acid ester polyurea coating, the polyether prepolymer comprises polytetrahydrofuran diol, polypropylene glycol, isophorone diisocyanate and a catalyst, wherein the mass ratio of polytetrahydrofuran diol to polypropylene glycol is (1-3):(1.5-4.5), the mass of the catalyst is 0.05-0.15% of the total mass of polytetrahydrofuran diol and polypropylene glycol, and the mass of isophorone diisocyanate is 45-50% of the total mass of polytetrahydrofuran diol and polypropylene glycol.

[0009] In the aforementioned BIT-amino silicone oil modified polyaspartic acid ester polyurea coating, the catalyst is one or at least two of dibutyltin dilaurate, triethylamine, cobalt cyclohexane, and N-ethylmorpholine.

[0010] The preparation method of the above-mentioned BIT-amino silicone oil modified polyaspartic acid ester polyurea coating comprises the following steps:

[0011] S1. Preparation of amino silicone oil prepolymer grafted with BIT:

[0012] a. Dissolve 1,2-benzisothiazol-3-one and isophorone dicyanate in tetrahydrofuran to obtain a BIT solution and an IPDI solution, respectively. Then, add the IPDI solution to the BIT solution, heat the mixture to 50-70°C, and react for 2-4 hours to obtain a BIT derivative BFM solution.

[0013] b. Mix and dissolve amino silicone oil, tetrahydrofuran and BFM solution, and react at room temperature until all isocyanate groups in the mixed system are reacted. Then, add isophorone dicyanate so that the mass percentage of NCO in the mixed system is 10%, thereby obtaining an amino silicone oil prepolymer grafted with BIT;

[0014] S2. Preparation of modified coating:

[0015] a. preparing a polyether prepolymer;

[0016] b. The polyether prepolymer, the BIT-grafted amino silicone oil prepolymer and polyaspartic acid ester are stirred and mixed according to R (NCO / NH) = 1.01 to 1.1, and then degassed by stirring, and then cured to obtain a BIT-amino silicone oil modified polyaspartic acid ester polyurea coating.

[0017] In the aforementioned preparation method, the preparation method of the polyether prepolymer comprises the following steps:

[0018] a. Polytetrahydrofuran diol and polypropylene glycol are mixed, and a catalyst is added, the temperature is raised to 100-110° C., and then vacuum dehydration is carried out for 0.8-1.2 h. After dehydration is completed, the mixture is cooled to room temperature to obtain product A;

[0019] b. Add isophorone diisocyanate to product A while maintaining the temperature below 50°C to obtain product B.

[0020] c. Heat product B to 75-85°C and react for 2-3 hours to obtain polyether prepolymer.

[0021] In the above-mentioned preparation method, in step b of S2, the stirring and mixing speed is 1000~3000r / min, and the time is 1~3min; the stirring and degassing speed is 1000~3000r / min, and the time is 1~3min; the coating is cured by first heating to 50~70℃ and curing for 1.5~2.5h and then heating to 70~90℃ until completely cured.

[0022] It also includes the application of BIT-amino silicone oil modified polyaspartic acid ester polyurea coating in marine antifouling coating.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention selects 1,2-benzisothiazol-3-one (BIT) as an antifouling active substance, and grafts 1,2-benzisothiazol-3-one (BIT) onto a prepolymer segment having amino silicone oil as a soft segment and isophorone dicyanate as a hard segment through the reaction of an isocyanate group and active hydrogen to prepare an isocyanate-terminated amino silicone oil prepolymer (PPCB) containing BIT. The PPCB is then compounded with a polyether prepolymer and cured with polyaspartic acid ester to obtain a BIT-amino silicone oil-modified polyaspartic acid ester polyurea coating.

[0025] The coating of the present invention has active antifouling and excellent fouling desorption properties. On the one hand, the introduction of BIT improves the ability of the coating surface to actively inhibit the adhesion of fouling organisms. At the same time, amino silicone oil can improve hydrophobicity, reduce surface energy, enhance the fouling release force of the coating, improve the smoothness and film-forming properties of the coating surface, reduce the friction coefficient, and improve wear resistance. The chemically grafted functional groups reduce the waste and pollution problems caused by the explosive release of antifouling agents compared to the traditional method of adding antifouling agents. The coating of the present invention has an adhesion inhibition rate of 95.05% and 98.47% for dichromatia and small crescent algae, respectively, and an inhibition rate of 77% for blue mussels. It has excellent antifouling and inhibition properties for both primary and large fouling organisms, making fouling organisms less likely to adhere, more resistant to external damage, and long service life. By combining this coating with regular underwater cleaning technology, a long-lasting and smooth underwater structure substrate can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a process diagram for preparing the BIT-amino silicone oil modified polyaspartic acid ester polyurea coating of the present invention;

[0027] Figure 2 is the SEM image of the coating;

[0028] Figure 3 is the AFM image of the coating;

[0029] Figure 4 This is the result of the coating wettability study;

[0030] Figure 5 is the mass loss graph of the coating’s resistance to wear;

[0031] Figure 6 is the cumulative mass loss graph of the coating’s resistance to cavitation erosion;

[0032] Figure 7 This is a graph showing the coating's resistance to the adhesion of double-browed algae;

[0033] Figure 8 This is a graph showing the coating's resistance to Closterium microphylla attachment;

[0034] Figure 9 is a graph of the number of mussel byssus discs on the coating surface;

[0035] Figure 10 This is a picture of the attachment of small crescent algae on the coating surface after flushing. DETAILED DESCRIPTION

[0036] The present invention is further described below with reference to the following examples, but is not intended to limit the present invention. (Unless otherwise specified, "parts" in the following examples are by mass.)

[0037] Example 1:

[0038] S1. Preparation of amino silicone oil prepolymer grafted with BIT (PPCB):

[0039] a. Weigh 6.04 parts of 1,2-benzisothiazol-3-one (BIT) and 8.89 parts of isophorone dicyanate (IPDI) and dissolve them in 50 parts of tetrahydrofuran respectively to obtain BIT solution and IPDI solution. Add the BIT solution to a condenser with temperature measurement, and then slowly add the IPDI solution to the BIT solution at room temperature for no more than 0.5h. After the addition is completed, open the condenser water, raise the temperature to 60°C, and react for 3h. After the reaction is completed, cool to room temperature to obtain a BIT derivative, which is recorded as BFM solution. The synthetic route of BFM is as follows: Figure 1 As shown in (a).

[0040] b. Add tetrahydrofuran to 40 parts of amino silicone oil to dissolve it, slowly add the BFM solution dropwise to the amino silicone oil, and react at room temperature. When all the isocyanate groups in the mixed system have reacted, add isophorone dicyanate (IPDI) dropwise to the system to ensure that the mass percentage of NCO in the entire mixed system is 10%. The entire process is carried out at room temperature to finally obtain an amino silicone oil prepolymer grafted with BIT (PPCB), and the solid content is measured. The synthetic route of the amino silicone oil prepolymer grafted with BIT (PPCB) is as follows: Figure 1 (b) shown.

[0041] S2. Preparation of modified coating:

[0042] a. Preparation of polyether prepolymer: 40 parts of polytetramethylene glycol (PTMG2000) and 60 parts of polypropylene glycol (PPG3000) were added to a three-necked flask equipped with a mechanical stirrer and a thermometer. Stirring was started and the temperature was raised to approximately 105°C. The mixed polyol was vacuum dehydrated using a vacuum pump for 1 hour. After dehydration, heating was stopped and the system temperature was allowed to cool to room temperature. Once the mixed polyol had cooled to room temperature, 48 parts of isophorone dicyanate (IPDI) was slowly added dropwise to the three-necked flask using a dropping funnel. The system temperature must not exceed 50°C during the IPDI addition. After the addition was complete, the system temperature was raised to 80°C. The reaction was allowed to proceed for 2.5 hours to obtain a polyether prepolymer.

[0043] b. Take 1.92 parts of PPCB and 17.25 parts of polyether prepolymer and mix them in a rotary mixer at a speed of 2000 r / min for 2.5 minutes. Weigh 10 parts of polyaspartic acid ester NH1220 according to R = 1.05 and add them to the mixed system. Place it in a rotary mixer and stir at a speed of 2000 r / min for 2 minutes. Then deaerate at 2000 r / min for 1.5 minutes. After completion, pour the mixture into a clean tetrafluoroethylene mold and place it in a vacuum oven at 50°C to remove the solvent and unremoved bubbles. After deaeration, turn off the vacuum pump. First raise the temperature to 60°C and cure for 2 hours, then raise the temperature to 80°C. After the coating is completely cured, remove it to obtain a BIT-amino silicone oil modified polyaspartic acid ester polyurea coating, recorded as STPU10.

[0044] Example 2:

[0045] Example 2 was prepared by referring to the preparation method of Example 1. The difference between Example 2 and Example 1 is that PPCB is 3.84 parts, polyether prepolymer is 15.33 parts, and NH1220 is 10 parts. The obtained coating is recorded as STPU20.

[0046] Example 3:

[0047] Example 3 was prepared by referring to the preparation method of Example 1. The difference between Example 3 and Example 1 is that PPCB is 5.75 parts, polyether prepolymer is 13.42 parts, and NH1220 is 10 parts. The obtained coating is recorded as STPU30.

[0048] Comparative Example:

[0049] Referring to the preparation method of Example 1, a comparative example was prepared. The difference between the comparative example and Example 1 was that PPCB was 0 parts, polyether prepolymer was 19.17 parts, and NH1220 was 10 parts. The obtained coating was recorded as STPU0.

[0050] The coatings of Examples 1-3 and the comparative example were subjected to performance tests:

[0051] (1) Surface morphology:

[0052] The surfaces of the coatings of Examples 1-3 and the comparative example were observed by scanning electron microscopy and atomic force microscopy, respectively. The results are as follows: Figure 2 、 Figure 3 and as shown in Table 1.

[0053] Table 1 Roughness of coating surface

[0054]

[0055] From the above, it can be seen that the coating surface of STPU20 is the smoothest, with a roughness of 6.70, its film-forming property is better, and the coating formed by curing is smoother.

[0056] (2) Hydrophobicity:

[0057] The surface wettability of the coating was studied by static water contact angle test. 4 μL of pure water was added to the coating surface using a contact angle meter. After the water droplet stabilized, a photo was taken and the contact angle was calculated. Five different positions were randomly selected for measurement on each coating, and the average value was taken for the final result. At the same time, the diiodomethane contact angle of the coating was tested, and the surface energy of the coating was calculated using the Owens two-liquid method. The final measurement results are as follows: Figure 4 shown.

[0058] Through testing, we know that Figure 4The water contact angle of the unmodified coating STPU0 in (a) is 91.7°, and the coating surface is hydrophobic. The introduction of silicone oil increases the contact angles of water and diiodomethane in the coating, improving the hydrophobicity. As the silicone content increases, the contact angle also shows an increasing trend. The water contact angle of STPU30 reaches 100.2°, and the hydrophobicity of the coating is improved. The silicon content of the coating of the present invention is increased, which reduces the content of the hydrophilic part of the coating. At the same time, the urea bond formed by the reaction of amino silicone oil and isocyanate forms more hydrogen bonds than carbamate. The increase in hydrogen bond content makes the coating more cross-linked, making it difficult for water molecules to enter the coating, thereby improving the service life of the coating.

[0059] Figure 4 In (b), it can be seen that the surface energy of STPU0 without PPCB is 33.74 mJ / m 2 The surface energy of the modified coating decreased significantly. With the increase of PPCB addition, the surface energy showed a downward trend. The surface energy of STPU30 was only 23.68mJ / m 2 The reduction of surface energy can improve the fouling release of the coating. The coating is between 20 and 30 mJ / m 2 It is least likely to be attached.

[0060] The wettability test showed that after the introduction of PPCB, the surface hydrophobicity of the coating increased and the surface energy decreased, making the coating less susceptible to attachment by fouling organisms.

[0061] (3) Wear resistance test:

[0062] The wear resistance of the coating was tested by a wear tester. All coatings were tested at a speed of 60r / min for 500s, and the mass of the coating before and after the test was accurately weighed using an analytical balance. The final test result was expressed as the mass difference before and after wear. The results are as follows: Figure 5 shown.

[0063] Depend on Figure 5 As shown, the wear loss of STPU0 after a 500-r wear test was 0.0815 g. The wear loss of the coating of the present invention first decreased and then increased with increasing amounts of BIT and amino silicone oil. The wear loss of the STPU20 coating was the lowest, at 0.0712 g. This coating of the present invention improves chipping resistance, smoothes the surface, and reduces the friction coefficient, thereby enhancing wear resistance.

[0064] (4) Cavitation resistance test:

[0065] The STPU20 coating and STPU0 were tested for their cavitation resistance. An ultrasonic cavitation generator was used to simulate the cavitation experiment. The medium was deionized water. The area of ​​the cavitation probe was 2 cm 2, amplitude of 50μm, ultrasonic frequency of 20kHz, power of 2000W, the distance between the coating and the probe was 2mm, after the experiment, the sample was cleaned and dried in an oven at 60℃ for 6h, and weighed with an analytical balance. The final result is expressed as cumulative mass loss. Figure 6 shown.

[0066] The cumulative mass loss of the unmodified STPU0 coating was 6.4 mg, while that of the STPU20 coating was 4.6 mg. This indicates that the introduction of BIT and amino silicone oil increases the rigidity of the coating, increasing its hardness and making the coating less susceptible to segmental breakage under cavitation impact. Furthermore, the increased presence of amino silicone oil increases the number of urea bonds within the polymer, forming more intramolecular hydrogen bonds, and strengthening the coating's cohesion and resistance to external damage.

[0067] (5) Antifouling performance test:

[0068] The anti-adhesion test was conducted on Ampelopsis radiata and Closterium microphyllum as primary fouling organism models to verify the coating's anti-fouling performance against primary fouling organisms. The anti-adhesion test was conducted on Mytilus edulis as a large fouling organism model to determine the coating's ability to resist the adhesion of large fouling organisms.

[0069] Examples 1-3 and the comparative example were tested as a sample group, and a glass sheet was tested as a blank group.

[0070] Static Algae Adhesion Test: The coating to be tested was cleaned, dried, and sterilized under UV light for 30 minutes. All instruments used in the experiment were sterilized in a high-temperature autoclave before use. The coating and 50 mL of algae solution were placed in a conical flask, sealed with parafilm, and placed in a lighted incubator. The lighting and temperature were consistent with those used for diatom culture. After the experiment, the coating was removed and washed with deionized water to remove any floating diatoms. The adhesion of diatoms to the coating surface was then observed using a fluorescence microscope. Three random locations on each coating were photographed and the area of ​​diatom adhesion was calculated. The results were averaged over three experiments.

[0071] Mussel selection and attachment test: Mussels collected from the wild are cleaned of surface dirt and byssus, and then placed in an aquarium for cultivation after processing. Before the experiment, mussels need to be selected and placed in a glass tank filled with artificial seawater for cultivation. The water temperature is controlled at 18±2°C. During the cultivation process, mussels with normal behavior and vigorous byssus secretion need to be selected. After the selection is completed, 16 purple mussels of similar size are selected and evenly placed on the coating surface, and the movement of the mussels and the secretion of byssus are recorded using a camera. When the mussels complete attachment to the coating surface (about 48 hours), the sample is removed, and then the byssus between the mussel and the coating surface is cut, and the byssus attachment to the coating surface is counted. After three parallel experiments, the average value is taken as the result to judge the coating's ability to resist mussel adhesion.

[0072] Figure 7 The figures show the coating's anti-adhesion test results against Diplophysa spp. After five days of immersion, a large number of diatoms adhered to the surfaces of both the glass sheet and the comparative STPU0 coating, demonstrating the good activity of the diatoms. The STPU0 coating has essentially no ability to resist diatom adhesion. The number of diatoms on the surfaces of the coatings of Examples 1-3 of the present invention was significantly reduced, demonstrating good resistance to diatom adhesion. Among them, the STPU20 coating had the best anti-algae effect. According to the quantitative results, the number of diatoms on the surface of the STPU20 coating was reduced by 95.05% compared to the glass sheet. The STPU30 coating, which had the worst effect, also achieved an anti-Diplophysa adhesion rate of 89.57%.

[0073] Figure 8 The results of the coating's anti-adhesion test on the planktonic diatom Closterium minor were shown. After 7 days of immersion, the surfaces of the glass slide and the comparative STPU0 coating were nearly covered with Closterium minor. However, the number of diatoms on the surfaces of the coatings of Examples 1-3 of the present invention was significantly reduced. The STPU20 coating exhibited an adhesion inhibition rate of 98.47% against Closterium minor, demonstrating that the coatings of the present invention exhibit excellent diatom adhesion resistance and can effectively prevent the formation of microbial biofilms in practical applications.

[0074] Figure 9 It is the number of byssus attached to the coating surface after 48 hours of testing. Figure 9 It can be seen that the number of byssus discs on the glass sheet is the largest, which is reduced in the control example and further reduced in the example. Among them, the number of byssus discs on the surface of STPU20 is the smallest, indicating that it has excellent anti-adhesion ability for mussels.

[0075] Antifouling performance test after water flow impact: The coatings of the comparative example and Examples 1-3 were placed under a water flow of 50 L / min for 30 minutes, and the coatings after flushing were tested for adhesion of Closterium microphyllum. The test results are shown in the figure. Figure 10 As shown. Figure 10 It can be seen that the coating of the present invention still has anti-fouling properties after being impacted by water flow, among which the number of diatoms attached to the surface of Example 2 is the least, which is reduced by 90.62% compared with STPU0, indicating that the coating of the present invention still maintains excellent ability to inhibit diatom attachment after being impacted by water flow.

Claims

1. BIT-amino silicone oil modified polyaspartic acid ester polyurea coating, characterized by: The invention relates to an amino silicone oil prepolymer grafted with BIT having an R (NCO / NH) ratio of 1.01 to 1.1, a polyether prepolymer and a polyaspartic acid ester; wherein the amino silicone oil prepolymer grafted with BIT is prepared by dissolving 1,2-benzisothiazol-3-one and isophorone diisocyanate in tetrahydrofuran to obtain a BIT solution and an IPDI solution, then adding the IPDI solution to the BIT solution, heating the mixture to 50 to 70°C, and reacting the mixture for 2 to 4 hours to obtain a BFM solution of a BIT derivative; mixing and dissolving the amino silicone oil, tetrahydrofuran and the BFM solution, and reacting the mixture at room temperature until the mixture is After all isocyanate groups in the system have reacted completely, isophorone diisocyanate is added so that the mass percentage of NCO in the mixed system is 10%. The polyether prepolymer comprises polytetrahydrofuran diol, polypropylene glycol, isophorone diisocyanate and a catalyst, wherein the mass ratio of polytetrahydrofuran diol to polypropylene glycol is (1-3):(1.5-4.5), the mass of the catalyst is 0.05-0.15% of the total mass of the polytetrahydrofuran diol and the polypropylene glycol, and the mass of the isophorone diisocyanate is 45-50% of the total mass of the polytetrahydrofuran diol and the polypropylene glycol.

2. The BIT-amino silicone oil modified polyaspartic acid ester polyurea coating according to claim 1, characterized in that: The preparation method comprises the following raw materials in parts by mass: 3.84 parts of amino silicone oil prepolymer grafted with BIT, 15.33 parts of polyether prepolymer and 10 parts of polyaspartic acid ester.

3. The BIT-amino silicone oil modified polyaspartic acid ester polyurea coating according to claim 1, characterized in that: The BFM includes 1,2-benzisothiazol-3-one, isophorone diisocyanate and tetrahydrofuran, and the mass ratio of 1,2-benzisothiazol-3-one, isophorone diisocyanate and tetrahydrofuran is (5-7): (6-10): (40-60).

4. The BIT-amino silicone oil modified polyaspartic acid ester polyurea coating according to claim 1, characterized in that: The catalyst is one or at least two of dibutyltin dilaurate, triethylamine, cobalt naphthenate and N-ethylmorpholine.

5. The method for preparing the BIT-aminosilicone oil modified polyaspartic acid ester polyurea coating according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Preparation of amino silicone oil prepolymer grafted with BIT: a. Dissolve 1,2-benzisothiazol-3-one and isophorone diisocyanate in tetrahydrofuran to obtain a BIT solution and an IPDI solution, respectively. Then, add the IPDI solution to the BIT solution, heat the mixture to 50-70°C, and react for 2-4 hours to obtain a BIT derivative BFM solution. b. Mix and dissolve amino silicone oil, tetrahydrofuran and BFM solution, react at room temperature until all isocyanate groups in the mixed system are reacted, and then add isophorone diisocyanate so that the mass percentage of NCO in the mixed system is 10%, thereby obtaining an amino silicone oil prepolymer grafted with BIT; S2. Preparation of modified coating: a. preparing a polyether prepolymer; b. The polyether prepolymer, the BIT-grafted amino silicone oil prepolymer, and polyaspartic acid ester are stirred and mixed according to R (NCO / NH) = 1.01 to 1.1, and then degassed by stirring, and then cured to obtain a BIT-amino silicone oil modified polyaspartic acid ester polyurea coating.

6. The preparation method according to claim 5, characterized in that: The preparation method of the polyether prepolymer comprises the following steps: a. Mix polytetrahydrofuran diol and polypropylene glycol, add a catalyst, raise the temperature to 100-110°C, then vacuum dehydrate for 0.8-1.2h, and cool to room temperature after dehydration to obtain product A; b. Add isophorone diisocyanate to product A while maintaining the temperature below 50°C to obtain product B. c. Heat product B to 75-85°C and react for 2-3 hours to obtain polyether prepolymer.

7. The preparation method according to claim 5, characterized in that: In step b of S2, the stirring and mixing speed is 1000~3000r / min, and the time is 1~3min; the stirring and degassing speed is 1000~3000r / min, and the time is 1~3min; the coating is cured by first heating to 50~70℃ and curing for 1.5~2.5h, and then heating to 70~90℃ until completely cured.

8. Use of the BIT-aminosilicone oil modified polyaspartic acid ester polyurea coating according to any one of claims 1 to 4, characterized in that: Application of the BIT-amino silicone oil modified polyaspartic acid ester polyurea coating in marine antifouling coating.

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