A wrinkle-resistant underwater crude oil adhesion-resistant gel coating and its preparation method

Abstract

This invention relates to the field of polymer marine antifouling technology, and in particular to an anti-wrinkle underwater anti-oil adhesion gel coating and its preparation method. The method involves uniformly mixing a hydrophilic polyether monomer, a hydrophobic polyether monomer, a diisocyanate, an epoxy resin, a catalyst, and a hydrophilic solvent to obtain a prepolymer. The prepolymer is then stirred uniformly with an amino chain extender to obtain a polyurethane solution. The polyurethane solution is coated onto a substrate and immersed in water, dried, and then immersed in water again to obtain the anti-wrinkle underwater anti-oil adhesion gel coating. The hydrophilic polyether monomer includes any one or more of bisphenol A diglycidyl ether, polyethylene glycol diglycidyl ether, hexanediol diglycidyl ether, and 1,4-butanediol diglycidyl ether; the hydrophobic polyether monomer includes any one or more of polytetrahydrofuran and polypropylene glycol. The gel coating of this invention possesses excellent anti-wrinkle and antifouling properties, while also exhibiting good mechanical properties and environmental friendliness.

Description

Technical Field

[0001] This invention relates to the field of polymer marine antifouling technology, and in particular to an anti-wrinkle underwater anti-crude oil adhesion gel coating and its preparation method. Background Technology

[0002] Crude oil contamination, particularly the adverse adsorption of spilled oil, remains a pressing issue in the widespread application of underwater equipment. For offshore operations, oil accumulation on underwater surfaces increases vessel drag and results in significant additional fuel consumption. For many man-made materials and equipment used in underwater activities, oil buildup can impair their functionality and operation. Underwater superoleophobic surfaces possess outstanding oil-resistant properties and hold great promise for applications in marine facility maintenance, environmental protection, anti-bioadhesion, liquid handling, and oil-water separation.

[0003] Chinese invention patent CN 116574438 A discloses an underwater superoleophobic hydrogel coating and its preparation method. This underwater superoleophobic hydrogel coating, after absorbing and swelling underwater to form a hydrogel, exhibits excellent adhesion to the substrate, maintains long-term stability underwater, is not easily deformed, and maintains excellent oil-repellent properties. However, this underwater superoleophobic hydrogel coating cannot maintain good anti-wrinkle properties in an underwater environment, and its mechanical properties and durability need further improvement.

[0004] Chinese invention patent CN 110484121A discloses an underwater superoleophobic coating, its preparation method, and its application. The polyurethane hydrogel coating formed by solvent displacement exhibits high adhesion to the substrate. After immersion in water for 7 days, the polyurethane hydrogel coating did not detach from the substrate, and the underwater contact angle of organic oil on the polyurethane hydrogel coating remained at 150±10°. However, this underwater superoleophobic hydrogel coating still suffers from poor anti-wrinkle properties in underwater environments, and its mechanical properties and durability require further improvement.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide an anti-wrinkle underwater crude oil adhesion gel coating and its preparation method. The gel coating prepared by this invention has excellent anti-wrinkle performance and anti-fouling effect, as well as good mechanical properties and environmental friendliness.

[0007] In a first aspect, the present invention provides a method for preparing an anti-wrinkle underwater crude oil adhesion-resistant gel coating, comprising the following steps:

[0008] S1. Mix the hydrophilic polyether monomer, hydrophobic polyether monomer, diisocyanate, epoxy resin, catalyst and hydrophilic solvent evenly, and react to obtain a prepolymer;

[0009] S2. Stir the prepolymer and amino chain extender evenly to obtain a polyurethane solution;

[0010] S3. Apply the polyurethane solution to the substrate and immerse it in water. After drying, immerse it in water again to obtain an anti-wrinkle underwater anti-crude oil adhesion gel coating.

[0011] The hydrophilic polyether monomer includes any one or more of bisphenol A diglycidyl ether, polyethylene glycol diglycidyl ether, hexanediol diglycidyl ether, polypropylene glycol diglycidyl ether, and 1,4-butanediol diglycidyl ether.

[0012] The hydrophobic polyether monomer includes any one or more of polytetrahydrofuran and polypropylene glycol.

[0013] This invention selects hydrophilic polyether monomers with diepoxy groups and inherently oily hydrophobic polyether monomers to react with diisocyanates to prepare polyurethane prepolymers. The diepoxy-based hydrophilic polyether monomers exhibit high reactivity, capable of chemically reacting with functional groups such as amino and hydroxyl groups to form stable chemical bonds. Simultaneously, introducing diepoxy groups into the polyurethane prepolymer increases the intermolecular crosslinking points, thereby improving the overall strength and stability of the material. Furthermore, selecting inherently oily hydrophobic polyether monomers to react with diisocyanates can, on the one hand, reduce the hydrophilicity of the polyurethane to a certain extent, thus slowing down the exchange of water between the polyurethane solution and the water. On the other hand, when the exchange of water between the polyurethane solution and the water is reduced, the polymer segments in the coating can better maintain their alignment and orientation, thereby enhancing the mechanical strength and deformation resistance of the coating. Therefore, selecting hydrophilic polyether monomers with diepoxy groups and inherently oily hydrophobic polyether monomers to react with diisocyanates to prepare polyurethane prepolymers can significantly improve the anti-wrinkle properties of gel coatings.

[0014] In the preparation process of the polyurethane prepolymer of the present invention, it is also proposed to add epoxy resin to the reaction system to utilize the continuous addition reaction between epoxy resin and diisocyanate to form long-chain polymers, thereby improving the strength and durability of the coating.

[0015] Furthermore, the present invention prepares a polyurethane solution by uniformly mixing the prepolymer with an amino chain extender; finally, the polyurethane solution is coated onto a substrate, then immersed in water, dried, and then immersed in water again. By utilizing the exchange process between the solvent and water and the rearrangement process of the hydrophobic and hydrophilic segments, an anti-wrinkle underwater anti-crude oil adhesion gel coating can be obtained.

[0016] As a preferred embodiment of this technical solution, in this invention, the molar ratio of the hydrophilic polyether monomer, the hydrophobic polyether monomer, the epoxy resin, and the diisocyanate is (0.25-4):(1-3):(1-3):(2.5-8), so that the hydrophilic polyether monomer, the hydrophobic polyether monomer, and the epoxy resin can fully react with the diisocyanate to prepare a polyurethane prepolymer.

[0017] As a preferred embodiment of this technical solution, the epoxy resin used in this invention includes any one or more of E44, E51, E42 and E20.

[0018] Among them, epoxy resin E44 generally refers to organic polymer compounds containing two or more epoxy groups in their molecules; epoxy resin E51 is also known as type E epoxy resin, and its chemical name is bisphenol A diglycidyl ether, abbreviated as EP; epoxy resin E42 is usually referred to as bisphenol A type epoxy resin; epoxy resin E20 can be classified as a type of bisphenol A epoxy resin, and its chemical structure contains multiple epoxy groups. These epoxy groups endow the resin with excellent adhesion, chemical corrosion resistance, mechanical strength and electrical insulation properties.

[0019] As a preferred embodiment of this technical solution, the diisocyanate includes any one or more of 1,5-pentamethylene diisocyanate (PDI), 2,4-toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPDI), and hexamethylene diisocyanate (HDI).

[0020] As a preferred embodiment of this technical solution, the catalyst includes any one or more of triethylamine, triethylenediamine, dibutyltin dilaurate, ferric octanoate, zinc naphthenate, and tetraisobutyl titanate; for example, triethylamine and dibutyltin dilaurate are often used in combination to prepare polyurethane.

[0021] The amount of catalyst used is 0.5%-5% of the total mass of the hydrophilic polyether monomer and the hydrophobic polyether monomer, and can be adjusted according to the activity of the catalyst and the reaction.

[0022] As a preferred embodiment of this technical solution, the hydrophilic solvent includes any one or more of N,N-dimethylacetamide, N,N-dimethylformamide, dimethyl sulfoxide, and tetrahydrofuran, and is preferably tetrahydrofuran.

[0023] In this invention, the total mass ratio of the hydrophilic polyether monomer and the hydrophobic polyether monomer to the hydrophilic solvent is 1:(0.25-10), which ensures that the solvent is fully dissolved before the reaction.

[0024] As a preferred embodiment of this technical solution, the amino chain extender can react with the isocyanate groups (-NCO) in the polyurethane prepolymer, thereby extending the polyurethane molecular chain and increasing its molecular weight. This reaction not only improves the mechanical properties of the polyurethane but may also improve its water resistance, hardness, and other properties. In this invention, the amino chain extender includes any one or more of ethylenediamine, diethylenetriamine, triethylenetetramine, KH550, KH650, m-phenylenediamine, and p-phenylenediamine; wherein the mass ratio of the amino chain extender to the prepolymer is 1:(5-20).

[0025] As a preferred embodiment of this technical solution, in step S1, the hydrophobic polyether monomer is subjected to vacuum distillation before the reaction to remove residual moisture in the system. Specifically, during vacuum distillation, the temperature can be controlled at 70-130℃ and the time at 1-4h. This invention does not impose strict limitations on these parameters.

[0026] As a preferred embodiment of this technical solution, in step S1, the reaction temperature is 50-100℃ and the time is 1-4h, but the present invention does not impose strict limitations on these conditions.

[0027] Secondly, the present invention also provides an anti-wrinkle underwater crude oil adhesion-resistant gel coating prepared by the above preparation method, which should also fall within the protection scope of the present invention.

[0028] The anti-wrinkle underwater anti-oil adhesion gel coating prepared by the present invention has excellent anti-wrinkle performance and anti-fouling effect, while also having good mechanical properties and environmental friendliness.

[0029] The method for preparing the anti-wrinkle underwater crude oil adhesion gel coating of the present invention has at least the following beneficial effects:

[0030] 1. In the preparation method of the anti-wrinkle underwater crude oil adhesion-resistant gel coating of the present invention, a hydrophilic polyether monomer with diepoxy groups and an oil-based hydrophobic polyether monomer are selected and reacted with diisocyanate to prepare a polyurethane prepolymer. The diepoxy groups have high reactivity and can chemically react with functional groups such as amino and hydroxyl groups to form stable chemical bonds. Simultaneously, introducing diepoxy groups into the polyurethane prepolymer can increase the intermolecular crosslinking points, thereby improving the overall strength and stability of the material. Therefore, the introduction of diepoxy groups helps reduce the deformation of the material under stress, thus improving the anti-wrinkle performance of the gel coating.

[0031] 2. In the preparation method of the anti-wrinkle underwater anti-crude oil adhesion gel coating of the present invention, the hydrophobic polyether monomer, which is inherently oily, is selected to react with diisocyanate. On the one hand, this can reduce the hydrophilicity of polyurethane to a certain extent, thereby slowing down the exchange between polyurethane solution and water, reducing the water content in the coating, and thus helping to maintain the stability and structural integrity of the coating. On the other hand, when the exchange between polyurethane solution and water is reduced, the polymer segments in the coating can better maintain their arrangement and orientation, thereby enhancing the mechanical strength and deformation resistance of the coating.

[0032] 3. In the preparation process of the prepolymer, this invention introduces epoxy resin, utilizing the continuous addition reaction between epoxy resin and isocyanate to form long-chain polymers, thereby improving the strength and durability of the coating. Furthermore, the -NCO functional groups in the isocyanate and the epoxy groups in the epoxy resin both possess high reactivity, enabling them to react under mild conditions and form stable chemical bonds, thus ensuring the high efficiency and reliability of the coating material. The resulting polyurethane (PUC) possesses excellent physical and chemical properties, further enhancing the strength, toughness, and chemical resistance of the coating material.

[0033] 4. In this invention, the prepolymer generated from the reaction is stirred evenly with an amino chain extender to prepare a polyurethane solution. This increases both the length of the polyurethane molecular chains and the content of hard segments in the polyurethane material. The formation of numerous hydrogen bonds between the hard segments increases intermolecular forces, thereby improving the strength and rigidity of the coating. These enhanced properties contribute to improving the anti-wrinkle performance of the coating material. Therefore, the gel coating prepared by this invention possesses excellent anti-wrinkle and anti-fouling properties, while also exhibiting good mechanical properties and environmental friendliness. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a surface photograph of the anti-wrinkle underwater anti-crude oil adhesion gel coating of the present invention;

[0036] Figure 2 This is a schematic diagram of the anti-wrinkle underwater anti-crude oil adhesion gel coating of the present invention sliding on oil stains in the air;

[0037] Figure 3 This is a schematic diagram of the anti-wrinkle underwater anti-crude oil adhesion gel coating of the present invention sliding on underwater oil slicks;

[0038] Figure 4 This is a photograph of the surface of the gel coating in Comparative Example 1 of the present invention;

[0039] Figure 5 This is a photograph of the surface of the gel coating in Comparative Example 2 of the present invention;

[0040] Figure 6 This is a photograph of the surface of the gel coating in Comparative Example 3 of the present invention;

[0041] Figure 7 This is a photograph of the surface of the gel coating in Comparative Example 4 of the present invention. Detailed Implementation

[0042] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] S1 and polytetrahydrofuran are subjected to vacuum distillation before the reaction to remove the moisture they contain. During vacuum distillation, the temperature is controlled at 70-130℃ and the time is 1-4h.

[0047] Add 4g of polypropylene glycol diglycidyl ether, 4g of polytetrahydrofuran, 4g of E51, 4g of IPDI, and 30mL of tetrahydrofuran to a flask, add 50μL of a mixture of triethylamine and dibutyltin laurate, and stir the mixture in an oil bath at 83℃ for 2.5h to obtain a prepolymer.

[0048] S2. Take 10g of the above prepolymer, add 3g of m-phenylenediamine and stir until homogeneous to obtain a polyurethane solution;

[0049] S3. Apply the polyurethane solution to the substrate and immerse it in water. After drying, immerse it in water again to obtain an anti-wrinkle underwater anti-crude oil adhesion gel coating.

[0050] Example 2

[0051] S1 and polytetrahydrofuran are subjected to vacuum distillation before the reaction to remove the moisture they contain. During vacuum distillation, the temperature is controlled at 70-130℃ and the time is 1-4h.

[0052] Add 4g of polypropylene glycol diglycidyl ether, 8g of polytetrahydrofuran, 4g of E51, 4g of IPDI, and 30mL of tetrahydrofuran to a flask, add 50μL of a mixture of triethylamine and dibutyltin laurate, and stir in an oil bath at 81℃ for 3h to obtain a prepolymer.

[0053] S2. Take 10g of the above prepolymer, add 3g of m-phenylenediamine and stir until homogeneous to obtain a polyurethane solution;

[0054] S3. Apply the polyurethane solution to the substrate and immerse it in water. After drying, immerse it in water again to obtain an anti-wrinkle underwater anti-crude oil adhesion gel coating.

[0055] Example 3

[0056] S1 and polytetrahydrofuran are subjected to vacuum distillation before the reaction to remove the moisture they contain. During vacuum distillation, the temperature is controlled at 70-130℃ and the time is 1-4h.

[0057] Add 4g of polypropylene glycol diglycidyl ether, 8g of polytetrahydrofuran, 4g of E51, 4g of IPDI, 20mL of tetrahydrofuran, and 10mL of N,N-dimethylacetamide to a flask, add 30μL of a mixture of triethylamine and dibutyltin laurate, and stir the mixture in an oil bath at 78℃ for 3.5h to obtain a prepolymer.

[0058] S2. Take 10g of the above prepolymer, add 2g of p-phenylenediamine and stir until homogeneous to obtain a polyurethane solution.

[0059] S3. Apply the polyurethane solution to the substrate and immerse it in water. After drying, immerse it in water again to obtain an anti-wrinkle underwater anti-crude oil adhesion gel coating.

[0060] Example 4

[0061] S1 and polytetrahydrofuran are subjected to vacuum distillation before the reaction to remove the moisture they contain. During vacuum distillation, the temperature is controlled at 70-130℃ and the time is 1-4h.

[0062] Add 4g of polypropylene glycol diglycidyl ether, 6g of polytetrahydrofuran, 6g of E51, 6g of IPDI, 15mL of tetrahydrofuran, and 5mL of N,N-dimethylacetamide to a flask, add 20μL of a mixture of triethylamine and dibutyltin laurate, and stir the mixture in an oil bath at 80℃ for 3h to obtain a prepolymer.

[0063] S2. Take 10g of the above prepolymer, add 2g of p-phenylenediamine and stir until homogeneous to obtain a polyurethane solution.

[0064] S3. Apply the polyurethane solution to the substrate and immerse it in water. After drying, immerse it in water again to obtain an anti-wrinkle underwater anti-crude oil adhesion gel coating.

[0065] Example 5

[0066] S1 and polytetrahydrofuran are subjected to vacuum distillation before the reaction to remove the moisture they contain. During vacuum distillation, the temperature is controlled at 70-130℃ and the time is 1-4h.

[0067] Add 4g of polypropylene glycol diglycidyl ether, 8g of polytetrahydrofuran, 4g of E51, 4g of IPDI, 15mL of tetrahydrofuran, and 5mL of N,N-dimethylacetamide to a flask, add 20μL of a mixture of triethylamine and dibutyltin laurate, and stir the mixture in an oil bath at 75℃ for 4h to obtain a prepolymer.

[0068] S2. Take 10g of the above prepolymer, add 2g of KH550 and stir evenly to obtain a polyurethane solution;

[0069] S3. Apply the polyurethane solution to the substrate and immerse it in water. After drying, immerse it in water again to obtain an anti-wrinkle underwater anti-crude oil adhesion gel coating.

[0070] Compare with Example 1

[0071] Refer to Example 1 of Chinese Invention Patent Publication No. CN 116574438 A.

[0072] Compare with Example 2

[0073] Example 1 is based on Chinese invention patent publication number CN 110484121A.

[0074] Compare with Example 3

[0075] This comparative example is basically the same as Example 1, except that polyethylene glycol is used instead of polypropylene glycol diglycidyl ether in this comparative example.

[0076] Compare with Example 4

[0077] This comparative example is basically the same as Example 1, except that polytetrahydrofuran ether diol is used instead of polytetrahydrofuran in this comparative example.

[0078] Experimental Example 1

[0079] The present invention analyzed the anti-wrinkle properties of the gel coatings prepared in the above embodiments and comparative examples. Figure 1 and Figure 4-7 Photographs of surfaces with different gel coatings;

[0080] Figure 2 This is a schematic diagram of the anti-wrinkle underwater anti-crude oil adhesion gel coating of the present invention sliding on oil stains in the air;

[0081] Figure 3 This is a schematic diagram of the anti-wrinkle underwater anti-oil adhesion gel coating of the present invention sliding on oil stains underwater.

[0082] Combination Figure 1 and Figure 4-7 It can be seen that the gel coating prepared by the present invention has superior anti-wrinkle properties compared with the control example.

[0083] Experimental Example 2

[0084] The present invention further tested the adhesion of the gel coatings prepared in the above embodiments and control examples to different substrates, and the test results are shown in Table 1.

[0085] Table 1 Test Results

[0086] Tin Al Steel PP PET Example 1 4220 kPa 2150 kPa 2980 kPa 1990 kPa 2310 kPa Example 2 4550 kPa 2220 kPa 3150 kPa 2070 kPa 2560 kPa Example 3 4420 kPa 2170 kPa 3070 kPa 1990 kPa 2440 kPa Example 4 4610 kPa 2250 kPa 3180 kPa 2050 kPa 2450 kPa Example 5 4510 kPa 2220 kPa 3150 kPa 2070 kPa 2560 kPa Compare with Example 1 380 kPa 300 kPa 320 kPa 410 kPa 310 kPa Compare with Example 2 130 kPa 100 kPa 120 kPa 105 kPa 113 kPa Compare with Example 3 5000 kPa 2200 kPa 3200KPa 1900 kPa 3100 kPa Compare with Example 4 4150 kPa 2140 kPa 2890 kPa 1950 kPa 2350 kPa

[0087] As shown in Table 1, the gel coatings prepared in Examples 1-5 of this invention exhibit stronger adhesion to various substrates compared to Control Examples 1-2. While Control Examples 3-4 also demonstrate strong adhesion to various substrates, the bonding... Figure 6-7 It can be seen that Comparative Examples 3-4 all exhibit poorer anti-wrinkle properties compared to the present invention. This may be because, in Comparative Example 3, polyethylene glycol was used instead of polypropylene glycol diglycidyl ether. Polyethylene glycol is more hydrophilic than polypropylene glycol diglycidyl ether, resulting in poorer anti-wrinkle properties due to faster solvent exchange. In Comparative Example 4, polytetrahydrofuran ether diol was used instead of polytetrahydrofuran. Since the polytetrahydrofuran ether diol (PTMEG) molecule contains a large number of ether bonds (-O-) and regularly arranged methylene groups (-CH2-), and the terminal group is a primary hydroxyl group, this structure makes PTMEG more hydrophilic than polytetrahydrofuran (PTHF), resulting in poorer anti-wrinkle properties of the prepared gel coating.

[0088] Experimental Example 3

[0089] The present invention also tested the underwater contact angle of gel coatings formed by different organic oils in the above-mentioned embodiments and control examples, and the test results are shown in Table 2.

[0090] Table 2 Test Results

[0091] hexadecane Toluene Peanut oil diiodomethane Pump oil crude Example 1 160±2° 152±4° 150±3° 144±3° 154±4° 155±2° Example 2 158±2° 151±3° 147±3° 143±2° 155±3° 154±3° Example 3 158±3° 152±3° 148±2° 144±4° 154±3° 156±4° Example 4 157±2° 150±3° 148±4° 142±3° 152±5° 151±4° Example 5 160±3° 152±2° 153±2° 142±3° 154±1° 155±3° Compare with Example 1 155±1° 150±3° 157±1° 143±2° 159±1° 154±2° Compare with Example 2 147±5° 150±3° 153±2° 138±9° 143±5° 150±4° Compare with Example 3 158±2° 152±2° 151±3° 145±4° 150±2° 147±2° Compare with Example 4 159±3° 153±1° 149±1° 145±2° 155±2° 157±2°

[0092] As shown in Table 2, the gel coating of the present invention has underwater superoleophobic properties. The underwater contact angle of organic oil with the polyurethane hydrogel coating is 150±10°. Underwater, organic oil can easily slide off the polyurethane gel coating, thereby achieving the effect of preventing oil adhesion.

[0093] In summary, the gel coating prepared by this invention has excellent anti-wrinkle and anti-fouling properties, as well as good mechanical properties and environmental friendliness.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing an anti-wrinkle underwater crude oil adhesion-resistant gel coating, characterized in that, Includes the following steps: S1. Mix the hydrophilic polyether monomer, hydrophobic polyether monomer, diisocyanate, epoxy resin, catalyst and hydrophilic solvent evenly, and react to obtain a prepolymer; S2. Stir the prepolymer and amino chain extender evenly to obtain a polyurethane solution; S3. Apply the polyurethane solution to the substrate and immerse it in water. After drying, immerse it in water again to obtain an anti-wrinkle underwater anti-crude oil adhesion gel coating. The hydrophilic polyether monomer includes any one or more of bisphenol A diglycidyl ether, polyethylene glycol diglycidyl ether, hexanediol diglycidyl ether, polypropylene glycol diglycidyl ether, and 1,4-butanediol diglycidyl ether. The hydrophobic polyether monomer includes any one or more of polytetrahydrofuran and polypropylene glycol; The molar ratio of the hydrophilic polyether monomer, the hydrophobic polyether monomer, the epoxy resin and the diisocyanate is (0.25-4):(1-3):(1-3):(2.5-8).

2. The preparation method according to claim 1, characterized in that, The epoxy resin includes any one or more of E44, E51, E42 and E20.

3. The preparation method according to claim 1, characterized in that, The diisocyanate includes any one or more of TDI, MDI, IPDI, and HDI.

4. The preparation method according to claim 1, characterized in that, The catalyst includes any one or more of triethylamine, triethylenediamine, dibutyltin dilaurate, ferric octanoate, zinc naphthenate, and tetraisobutyl titanate. The amount of catalyst used is 0.5%-5% of the total mass of the hydrophilic polyether monomer and the hydrophobic polyether monomer.

5. The preparation method according to claim 1, characterized in that, The hydrophilic solvent includes any one or more of N,N-dimethylacetamide, N,N-dimethylformamide, dimethyl sulfoxide, and tetrahydrofuran; The total mass ratio of the hydrophilic polyether monomer and the hydrophobic polyether monomer to the hydrophilic solvent is 1:(0.25-10).

6. The preparation method according to claim 1, characterized in that, The amino chain extender includes any one or more of ethylenediamine, diethylenetriamine, triethylenetetramine, KH550, KH650, m-phenylenediamine, and p-phenylenediamine; The mass ratio of the amino chain extender to the prepolymer is 1:(5-20).

7. The preparation method according to claim 1, characterized in that, In step S1, the hydrophobic polyether monomer is subjected to vacuum distillation before the reaction. During vacuum distillation, the temperature is controlled at 70-130℃ and the time is 1-4h.

8. The preparation method according to claim 1, characterized in that, In step S1, the reaction temperature is 50-100℃ and the time is 1-4h.

9. A wrinkle-resistant underwater crude oil adhesion-resistant gel coating, characterized in that, It is prepared according to any one of claims 1-8.

Images