UV-curable fluorine-containing waterborne polyurethane anti-fog coating material, preparation and application thereof

Abstract

The application discloses a kind of UV curing fluorine-containing waterborne polyurethane antifogging coating and its preparation and application.The preparation method is in the state of stirring, diisocyanate is reacted with polyether polyol at 65-75 DEG C for 2-4 hours, then anionic hydrophilic chain extender is added at 70-80 DEG C and reacted for 3-5 hours, to introduce hydrophilic carboxyl group to molecular chain;hydroxyl-containing acrylate and fluorine alcohol are added to the reaction system at 80-85 DEG C, and the pre-polymer is capped after 4-5 hours of reaction;finally, after neutralization, emulsification, fluorine-containing waterborne polyurethane emulsion is obtained.The prepared emulsion is coated on glass plate, dried, and then cured by ultraviolet light to obtain a polyurethane antifogging coating.The coating has excellent antifogging ability, oil resistance and dirt resistance, and the adhesion reaches 0 level, the hardness reaches H, and the water resistance is good.

Description

Technical Field

[0001] This invention belongs to the field of UV-curable waterborne polyurethane technology, specifically relating to a method for preparing a fluorine-containing UV-curable waterborne polyurethane antifog coating and its application in antifog coatings. Background Technology

[0002] Transparent materials are ubiquitous in daily life, such as eyeglasses, mobile phone lenses, shop window glass, and car windshields. However, these transparent materials can fog up when there is a temperature difference between the inside and outside. Moisture in the air condenses on the material's surface, diffusing light and significantly reducing its light transmittance, thus affecting people's vision. Fogging often causes many inconveniences and sometimes even results in serious economic losses.

[0003] Among existing anti-fogging technologies, the three most commonly used methods are heating, convection, and coating. Heating, as the name suggests, involves heating the substrate to eliminate the temperature difference between the inner and outer surfaces, fundamentally solving the fogging problem. The disadvantage of this method is its high cost. Convection involves increasing the gas convection velocity on the substrate surface to promote droplet evaporation. Coating involves applying an anti-fogging coating to the substrate surface, creating a second surface. Common anti-fogging coatings include hydrophobic and hydrophilic coatings. The former allows water droplets to slide off the coating, while the latter allows water droplets to spread evenly on the substrate surface to achieve the anti-fogging effect.

[0004] Chinese invention patent application CN202310700072.6 discloses a method for preparing a polyurethane pre-coated film. Before coating, the substrate needs to undergo corona treatment, then the coating is applied to the substrate surface, and finally, a freezing treatment of 1-7 days is required. Although the resulting anti-fog coating has good durability, the production cycle is too long, requiring three stages of heating, making the process cumbersome. Furthermore, the minimum freezing temperature of -17°C described in the patent places high demands on the production equipment.

[0005] Chinese invention patent CN201910257367.4 discloses a method for preparing a room-temperature curing polyurethane antifog film. This patent uses an aziridine crosslinking agent to achieve room-temperature curing of the polyurethane. While this method saves resources associated with heating, aziridine crosslinking agents are highly toxic and have a pungent ammonia odor, which can cause discomfort and health problems for production and construction workers. Furthermore, the curing cycle using aziridine crosslinking agents is relatively long, which can impact production efficiency. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a method for preparing a UV-curable fluorinated waterborne polyurethane antifog coating. The coating prepared by this method has excellent antifog performance and also possesses a certain degree of anti-fogging ability.

[0007] To achieve the objectives of this invention, the following technical solution is adopted:

[0008] 1. A method for preparing a UV-curable fluorinated waterborne polyurethane antifog coating, characterized by comprising the following steps:

[0009] (1) Under stirring, diisocyanate and polyether polyol are stirred evenly, and then the catalyst dibutyltin dilaurate is added. The reaction is carried out at 65-75℃ for 2-4 hours to obtain linear isocyanate-terminated polyurethane prepolymer.

[0010] (2) Add anionic hydrophilic chain extender to the polyurethane prepolymer obtained in step (1) and react at 70-80℃ for 3-5 hours to obtain a polyurethane prepolymer containing hydrophilic carboxyl groups on the molecular chain.

[0011] (3) Add hydroxyl-containing acrylates, polymerization inhibitors and fluoroalcohols containing long fluorocarbon chains to the reaction system, and react at 80-85°C for 5-6 hours to obtain polyurethane prepolymers with double bonds and long fluorocarbon chains; the carbon chains of fluoroalcohols containing long fluorocarbon chains have more than 6 carbon atoms.

[0012] (4) Cool the prepolymer prepared in step (3) to room temperature, add a neutralizing agent to neutralize it, then add deionized water, and emulsify under high speed stirring to obtain fluorinated waterborne polyurethane emulsion.

[0013] (5) Mix the emulsion obtained in step (4) with the photoinitiator evenly, coat it on a glass plate, dry it and then cure it with ultraviolet light to obtain a water-based polyurethane anti-fog coating.

[0014] To further achieve the objectives of this invention, preferably, the molar ratio of the diisocyanate, polyether polyol, anionic hydrophilic chain extender, hydroxyl-containing acrylate, and perfluoroalcohol is 1.5:0.2-0.4:0.6-0.8:0.7-0.8:0.2-0.3.

[0015] Preferably, the diisocyanate is one of isophorone diisocyanate and hexamethylene diisocyanate; the polyether polyol is one of polyethylene glycol, polypropylene glycol, and polytetrahydrofuran glycol, with a molecular weight between 400 and 1500.

[0016] Preferably, the anionic hydrophilic chain extender is one of 2,2-dimethylolpropionic acid and 2,2-dimethylolbutyric acid.

[0017] Preferably, the hydroxyl-containing acrylate is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, and hydroxyethyl methacrylate.

[0018] Preferably, the polymerization inhibitor is one of hydroquinone and p-hydroxyanisole.

[0019] Preferably, the fluoroalcohol is one or more of perfluorooctanoic acid and perfluorohexylethanol.

[0020] Preferably, the neutralizing agent is one or more of ammonia, diethanolamine, and triethylamine.

[0021] A UV-curable fluorinated waterborne polyurethane antifog coating is prepared by the above-described preparation method.

[0022] The application of the UV-cured fluorinated waterborne polyurethane antifog coating in the preparation of antifog coatings.

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

[0024] 1) This invention introduces fluorocarbon chains to the ends of molecular chains by adding fluoroalcohols during the end-capping stage. When the coating is exposed to an oily environment, due to the low surface energy of the fluorocarbon chains, oil droplets exhibit a large contact angle on the coating surface and can slide off the coating surface, which gives the coating a certain degree of anti-fouling ability. When the coating is exposed to an aqueous environment, the fluorocarbon chains move slowly under the interaction of water molecules and hydrophilic subsurfaces, allowing water droplets to pass through the fluorocarbon chains, penetrate to the hydrophilic subsurfaces, and complete spreading, thus maintaining good anti-fogging ability of the coating.

[0025] 2) The waterborne polyurethane prepolymer prepared by this invention has double bonds at its ends and can be cured by ultraviolet light. Compared with CN201910257367.4, the curing speed of ultraviolet light is faster, the production efficiency is higher, and the curing process does not produce irritating odors, which is more friendly to production and construction personnel. The coating performance of the prepared coating is significantly better than that of the prior art. Compared with CN202310700072.6, this invention does not require freezing of the coating film or staged heating, and has lower requirements for production equipment, which can greatly improve production efficiency.

[0026] 3) The UV-cured fluorinated waterborne polyurethane antifog coating of the present invention forms a coating with excellent comprehensive performance. It has good antifog function, anti-fogging ability, adhesion grade 0, hardness grade H, and good water resistance. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the preparation method of the UV-cured fluorinated waterborne polyurethane antifog coating corresponding to Example 1 of the present invention.

[0028] Figure 2The image shows the total reflectance infrared spectrum of the anti-fog coating prepared in Example 1.

[0029] Figure 3 , Figure 4 The image shows the X-ray photoelectron spectrum of the anti-fog coating prepared in Example 1. Figure 3 This is the full spectrum. Figure 4 This is a fine spectrum of C1s.

[0030] Figure 5 This is a photograph showing the change in the water and oil contact angles of the anti-fog coating prepared in Example 1 over time. Detailed Implementation

[0031] To better understand the present invention, the present invention will be further described in detail below with reference to the embodiments. However, the scope of protection of the present invention is not limited to the scope represented by the embodiments.

[0032] In existing technologies related to waterborne polyurethane antifog coatings, few coatings can combine excellent antifog capabilities with a certain degree of anti-fogging ability. Given these limitations, developing waterborne polyurethane antifog coatings that offer fast curing speed, low environmental pollution, simple production processes, and some anti-fogging capabilities has become an important research direction.

[0033] like Figure 1 As shown in the flowchart, this invention discloses a method for preparing a UV-curable fluorinated waterborne polyurethane antifog coating. First, isocyanate substances are reacted with polyols. The isocyanate groups and hydroxyl groups react, and due to an excess of isocyanate groups, a linear prepolymer with terminal isocyanate groups is ultimately formed. In the second stage, a hydrophilic chain extender containing hydroxyl and carboxyl groups is added. The hydroxyl groups at both ends of the hydrophilic chain extender further react with the isocyanate groups, introducing the carboxyl groups from the hydrophilic chain extender into the polyurethane molecular chain, improving the hydrophilicity of the polyurethane and achieving self-emulsification. In the end-capping stage, hydroxyethyl acrylate containing double bonds and fluoroalcohol containing hydroxyl groups are added to react and remove the remaining isocyanate groups. The former imparts UV curability to the polyurethane, while the latter introduces long fluorocarbon chains into the polyurethane molecular chain. This invention introduces fluorocarbon chains to the ends of the molecular chain by adding fluoroalcohols in the end-capping stage. When the coating is exposed to an oily environment, due to the low surface energy of the fluorocarbon chains, oil droplets will exhibit a large contact angle on the coating surface and can slide off the coating surface, which gives the coating a certain degree of anti-fouling ability. When the coating is exposed to an aqueous environment, the fluorocarbon chains will move slowly under the interaction of water molecules and hydrophilic subsurfaces, allowing water droplets to pass through the fluorocarbon chains, penetrate into the hydrophilic subsurfaces, and complete the spreading, so that the coating maintains good anti-fogging ability.

[0034] Example 1

[0035] like Figure 1As shown, a method for preparing a UV-curable fluorinated waterborne polyurethane antifog coating includes the following steps:

[0036] (1) Under stirring, 10.5g of isophorone diisocyanate and 3.6g of polyethylene glycol (molecular weight 600) were stirred evenly, and 0.01g of dibutyltin dilaurate catalyst was added. The mixture was reacted at 75°C for 3h to obtain a linear isocyanate-terminated polyurethane prepolymer.

[0037] (2) Add 3.552 g of 2,2-dihydroxymethylbutyric acid to the polyurethane prepolymer obtained in step (1) and react at 80°C for 5 h to obtain a polyurethane prepolymer containing hydrophilic carboxyl groups on the molecular chain.

[0038] (3) Add 3.016g of hydroxyethyl acrylate, 0.006g of polymerization inhibitor p-hydroxyanisole and 1.456g of 2-(perfluorohexyl)ethyl to the reaction system and react at 85°C for 5.5h to obtain a polyurethane prepolymer with double bonds and long fluorocarbon chains.

[0039] (4) Cool the prepolymer prepared in step (3) to room temperature, add 2.424g of triethylamine for neutralization, then add 70g of deionized water, and emulsify under high speed stirring to obtain fluorinated waterborne polyurethane emulsion.

[0040] (5) Mix the waterborne polyurethane emulsion obtained in step (4) with photoinitiator 1173 evenly, coat it on a glass plate, dry it and then cure it with ultraviolet light to obtain a waterborne polyurethane anti-fog coating.

[0041] The total reflectance infrared spectrum of the cured waterborne polyurethane antifog coating is shown below. Figure 2 As shown in the spectrum. It can be seen from the spectrum that it is located at 2265 cm⁻¹. -1 The characteristic absorption peak of the -NCO group at the specified position no longer exists, indicating that the -NCO group has completely reacted during the end-capping and emulsification stages. It is worth noting that the peak at 3060 cm⁻¹ in the figure... -1 The absorption peak intensity of the stretching vibration of unsaturated hydrocarbons is very low, at 1650 cm⁻¹. -1 The stretching vibration absorption peak at C=C did not appear, and at 920 cm⁻¹ -1 990cm -1 The out-of-plane bending vibration absorption peak of the monosubstituted olefin was not observed, indicating that the C=C structure reacted during UV curing to form a cross-linked structure. Furthermore, at 635 cm⁻¹... -1 Absorption peaks for the stretching vibrations of -CF2 appeared at 1000–1300 cm⁻¹. -1 Nearby, the absorption peaks of multiple structures such as CO and CF overlap, indicating that perfluorooctanoic acid has been successfully incorporated into the polyurethane molecular chain.

[0042] The X-ray photoelectron spectrum of the cured waterborne polyurethane antifog coating is shown below. Figure 3 , Figure 4 As shown. In Figure 3 The peak corresponding to F1s can be clearly seen in the full spectrum, combined with... Figure 4 The presence of CF2 peaks near 292 eV and CF3 peaks near 294 eV in the fine C1s spectrum indicates the presence of fluorine on the coating surface. Quantitative analysis shows that the percentage of F atoms on the coating surface is 12%, far higher than the theoretical value, indicating that the low surface energy characteristics of the fluorocarbon chain lead to the enrichment of fluorine atoms on the coating surface.

[0043] Example 2

[0044] A method for preparing a UV-curable fluorinated waterborne polyurethane antifog coating includes the following steps:

[0045] (1) Under stirring, 10.5g of isophorone diisocyanate and 3.6g of polypropylene glycol (molecular weight 600) were stirred evenly, and then 0.012g of dibutyltin dilaurate catalyst was added. The reaction was carried out at 75°C for 3h to obtain linear isocyanate-terminated polyurethane prepolymer.

[0046] (2) Add 3.216 g of 2,2-dimethylolpropionic acid to the polyurethane prepolymer obtained in step (1), dissolve it in N-methylpyrrolidone at a mass ratio of 1.5:1, add it to the reaction system, and react at 80°C for 5 h to obtain a polyurethane prepolymer containing hydrophilic carboxyl groups on the molecular chain.

[0047] (3) Add 3.016g of hydroxyethyl acrylate, 0.006g of polymerization inhibitor p-hydroxyanisole and 0.728g of 2-(perfluorohexyl)ethanol to the reaction system and react at 85°C for 5.5h to obtain a polyurethane prepolymer with double bonds and long fluorocarbon chains.

[0048] (4) Cool the prepolymer prepared in step (3) to room temperature, add 2.424g of triethylamine for neutralization, then add 70g of deionized water, and emulsify under high speed stirring to obtain fluorinated waterborne polyurethane emulsion.

[0049] (5) Mix the waterborne polyurethane emulsion obtained in step (4) with photoinitiator 1173 evenly, coat it on a glass plate, dry it and then cure it with ultraviolet light to obtain a waterborne polyurethane anti-fog coating.

[0050] Example 3

[0051] A method for preparing a UV-curable fluorinated waterborne polyurethane antifog coating includes the following steps:

[0052] (1) Under stirring, 10.5g of isophorone diisocyanate and 6g of polyethylene glycol (molecular weight 1000) were stirred evenly, and then 0.013g of dibutyltin dilaurate catalyst was added. The reaction was carried out at 75°C for 3h to obtain linear isocyanate-terminated polyurethane prepolymer.

[0053] (2) Add 3.216 g of 2,2-dimethylolpropionic acid to the polyurethane prepolymer obtained in step (1), dissolve it in N-methylpyrrolidone at a mass ratio of 1.5:1, add it to the reaction system, and react at 80°C for 5 h to obtain a polyurethane prepolymer containing hydrophilic carboxyl groups on the molecular chain.

[0054] (3) Add 3.38g of hydroxyethyl methacrylate, 0.006g of polymerization inhibitor p-hydroxyanisole and 1.456g of 2-(perfluorohexyl)ethanol to the reaction system and react at 85°C for 5.5h to obtain a polyurethane prepolymer with double bonds and long fluorocarbon chains.

[0055] (4) Cool the prepolymer prepared in step (3) to room temperature, add 2.424g of triethylamine for neutralization, then add 70g of deionized water, and emulsify under high speed stirring to obtain fluorinated waterborne polyurethane emulsion.

[0056] (5) Mix the waterborne polyurethane emulsion obtained in step (4) with photoinitiator 1173 evenly, coat it on a glass plate, dry it and then cure it with ultraviolet light to obtain a waterborne polyurethane anti-fog coating.

[0057] Comparative Example 1

[0058] (1) Under stirring, 10.5g of isophorone diisocyanate and 6g of polyethylene glycol (molecular weight 1000) were stirred evenly, and 0.01g of catalyst dibutyltin dilaurate was added. The reaction was carried out at 75°C for 3h to obtain linear isocyanate-terminated polyurethane prepolymer.

[0059] (2) Add 3.552 g of 2,2-dihydroxymethylbutyric acid to the polyurethane prepolymer obtained in step (1) and react at 80°C for 5 h to obtain a polyurethane prepolymer containing hydrophilic carboxyl groups on the molecular chain.

[0060] (3) Add 3.3g of hydroxyethyl acrylate and 0.005g of hydroquinone as a polymerization inhibitor to the reaction system and react at 85°C for 5.5h to obtain a polyurethane prepolymer with double bonds and long fluorocarbon chains.

[0061] (4) Cool the prepolymer prepared in step (3) to room temperature, add 2.424g of triethylamine for neutralization, then add 70g of deionized water, and emulsify under high speed stirring to obtain fluorinated waterborne polyurethane emulsion.

[0062] (5) Mix the waterborne polyurethane emulsion obtained in step (4) with photoinitiator 1173 evenly, coat it on a glass plate, dry it and then cure it with ultraviolet light to obtain a waterborne polyurethane anti-fog coating.

[0063] Comparative Example 2

[0064] (1) Under stirring, 10.5g of isophorone diisocyanate and 3.6g of polyethylene glycol (molecular weight 600) were stirred evenly, and 0.01g of dibutyltin dilaurate catalyst was added. The mixture was reacted at 75°C for 3h to obtain a linear isocyanate-terminated polyurethane prepolymer.

[0065] (2) Add 3.552 g of 2,2-dihydroxymethylbutyric acid to the polyurethane prepolymer obtained in step (1) and react at 80°C for 5 h to obtain a polyurethane prepolymer containing hydrophilic carboxyl groups on the molecular chain.

[0066] (3) Add 3.016g of hydroxyethyl acrylate, 0.006g of polymerization inhibitor p-hydroxyanisole and 0.672g of hexafluoroisopropanol to the reaction system, and react at 85°C for 5.5h to obtain a polyurethane prepolymer with double bonds and fluorocarbon chain end capping.

[0067] (4) Cool the prepolymer prepared in step (3) to room temperature, add 2.424g of triethylamine for neutralization, then add 70g of deionized water, and emulsify under high speed stirring to obtain fluorinated waterborne polyurethane emulsion.

[0068] (5) Mix the waterborne polyurethane emulsion obtained in step (4) with photoinitiator 1173 evenly, coat it on a glass plate, dry it and then cure it with ultraviolet light to obtain a waterborne polyurethane anti-fog coating.

[0069] The prepared anti-fog coating was placed above hot water at 85°C, and the surface was observed to see if fogging occurred. The placement time was greater than 2 minutes. The results are listed in Table 1.

[0070] The pencil hardness of the coating was determined using a QHQ-A type pencil hardness tester in accordance with GB / T 6739-2006, and the results are listed in Table 1.

[0071] Referring to GB / T 1733-1993, the anti-fog coating was immersed in deionized water, and the occurrence of bubbling, whitening, and peeling was observed. The results are listed in Table 1.

[0072] According to GB / T 9286-1998, the adhesion of the paint film was determined by cross-cut test using an HGQ type paint film cross-cut tester. The results are listed in Table 1.

[0073] Table 1

[0074]

[0075]

[0076] As can be seen from Table 1, the anti-fog coating of the present invention has significant comprehensive performance advantages. For example, the anti-fog coating prepared by the present invention has anti-fog capabilities, which is not possessed by most current anti-fog coatings. (Contact angle photographs from Example 1 are also shown.) Figure 5 As can be seen, the oil contact angle decreased by only about 20° in 90 seconds, and still maintained a relatively large contact angle at the end. This allowed the oil droplets to slide off the coating surface without contaminating it. The water contact angle, however, decreased from a larger value to about 15° in 90 seconds. This is because the fluorocarbon chains on the coating surface move under the interaction of the water droplets and the hydrophilic subsurface, allowing the water droplets to penetrate the surface fluorocarbon chains and spread out, thus reducing the contact angle and light refraction, giving the coating its anti-fogging properties. Comparative Example 1 did not add long-chain fluoroalcohols during the end-capping stage. Its surface lacked the protection of fluorine atoms. Although the entire coating was hydrophilic, it was also oleophilic. When oil droplets came into contact with the coating surface, they spread out and contaminated the surface, causing the coating to lose its anti-fogging properties. In Comparative Example 2, hexafluoroisopropanol, with its relatively short fluorocarbon chain, was added during the end-capping stage. The biggest problem with short fluorocarbon chains is their poor mobility. The resulting fluorinated protective layer lacks mobility, making it difficult for water droplets to reach the hydrophilic second surface when water comes into contact with the coating. Without contact with the hydrophilic surface, the water droplets cannot spread, resulting in light refraction and scattering, thus leading to poor anti-fogging performance. Therefore, in this invention, the addition of fluoroalcohol and the length of the fluorocarbon chain are crucial.

[0077] For example, the coating of this invention achieves an adhesion rating of 0, a hardness of H, and good water resistance. When applied to automotive windshields, the anti-fog coating prepared based on water-based polyurethane anti-fog paint achieves an adhesion rating of 0, eliminating concerns about the coating peeling off due to weak adhesion, resulting in a long coating lifespan. The hardness of H largely prevents scratches when subjected to hard objects, ensuring the transparency and aesthetics of the glass surface. During rainy driving, the coating's anti-fog properties protect the windshield from water contamination without sacrificing its anti-fog properties, a feature not found in other coatings. In conclusion, this coating has significant application value and can play its due role in relevant fields.

[0078] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A process for the preparation of a UV-curable fluorine-containing aqueous polyurethane anti-fog coating characterized in that It comprises the following steps: (1) under stirring, the diisocyanate and polyether polyol are stirred uniformly, then the catalyst dibutyltin dilaurate is added, and the reaction is carried out at 65-75℃ for 2-4h to obtain a linear isocyanate-terminated polyurethane prepolymer; (2) the anionic hydrophilic chain extender is added to the polyurethane prepolymer obtained in step (1), and the reaction is carried out at 70-80℃ for 3-5h to obtain a polyurethane prepolymer containing hydrophilic carboxyl groups in the molecular chain; (3) the hydroxyl-containing acrylate, the polymerization inhibitor and the fluorine alcohol containing long fluorocarbon chain are added to the reaction system, and the reaction is carried out at 80-85℃ for 5-6h to obtain a polyurethane prepolymer terminated with double bonds and long fluorocarbon chain; the carbon chain of the fluorine alcohol containing long fluorocarbon chain has more than 6 carbon atoms; (4) the prepolymer prepared in step (3) is cooled to room temperature, a neutralizing agent is added for neutralization, then deionized water is added, and emulsification is completed under high-speed stirring to obtain a fluorine-containing waterborne polyurethane emulsion; (5) the emulsion obtained in step (4) is mixed uniformly with a photoinitiator, coated on a glass plate, dried, and then subjected to ultraviolet curing to obtain a waterborne polyurethane anti-fogging coating.

2. The method for preparing a UV-curable fluorine-containing waterborne polyurethane anti-fog coating according to claim 1, characterized in that, The molar ratio of the diisocyanate, the polyether polyol, the anionic hydrophilic chain extender, the hydroxyl-containing acrylate, the fluorine alcohol containing long fluorocarbon chain is 1.5:0.2-0.4:0.6-0.8:0.7-0.8:0.2-0.

3.

3. The preparation method of the UV-curable fluorinated waterborne polyurethane antifogging coating according to claim 1, characterized in that, The diisocyanate is one of isophorone diisocyanate and hexamethylene diisocyanate; the polyether polyol is one of polyethylene glycol, polypropylene glycol and polytetrahydrofuran diol, and the molecular weight is between 400 and 1500.

4. The preparation method of the UV-curable fluorinated waterborne polyurethane antifog coating according to claim 1, characterized in that, The anionic hydrophilic chain extender is one of 2,2-dimethylol propionic acid and 2,2-dimethylol butyric acid.

5. The preparation method of the UV-curable fluorinated waterborne polyurethane antifogging coating according to claim 1, characterized in that, The hydroxyl-containing acrylate is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate.

6. The method for preparing the UV-cured fluorinated waterborne polyurethane antifog coating according to claim 1, characterized in that, The polymerization inhibitor is one of hydroquinone and p-hydroxyanisole.

7. The preparation method of the UV-curable fluorinated waterborne polyurethane antifogging coating according to claim 1, characterized in that, The fluorine alcohol containing long fluorocarbon chain is one or more of perfluorooctanol and perfluorohexyl ethanol.

8. The method for preparing the UV-cured fluorinated waterborne polyurethane antifog coating according to claim 1, characterized in that, The neutralizing agent is one or more of ammonia, diethanolamine and triethylamine.

9. A UV-curable fluorine-containing waterborne polyurethane anti-fog coating characterized by It is prepared by the preparation method of any one of claims 1-8.

10. The application of the UV-cured fluorine-containing waterborne polyurethane anti-fogging coating of claim 9 in the preparation of an anti-fogging coating.

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