A vinyl-terminated polyurethane film, its continuous production method and application

Abstract

The application discloses a kind of vinyl-terminated polyurethane film and its continuous production method and application, it is related to film production technical field, including substrate material sequentially through 1-2 section heat curing process, 2-5 section UV light curing process and 1-2 section EB curing process.The vinyl-terminated polyurethane film continuous production method of the application can significantly improve the film production speed, while guaranteeing that coating has excellent scratch resistance, hardness and elongation at break.

Description

Technical Field

[0001] This invention relates to the field of film production technology, and in particular to a vinyl-terminated polyurethane film, its continuous production method, and its application. Background Technology

[0002] The current drawback of thermosetting technology is that heat transfer occurs gradually from the coating surface inwards. This can lead to incomplete or uneven curing within the coating, affecting its overall performance and quality stability. This problem is particularly pronounced in thicker coatings or coatings on large plastic films. While UV curing can address uneven curing to some extent, it requires the addition of specific photoinitiators, some of which have stability issues, potentially impacting the final product's performance. Furthermore, UV light has limited penetration and is color-sensitive, making it difficult to cure thick or dark materials, resulting in incomplete curing of the underlying layers. In multi-layer curing, uncured underlying layers can lead to structural defects. Moreover, controlling the uniformity of UV light sources is difficult, easily resulting in uneven curing. UV equipment has high energy consumption, leading to significant long-term operating costs. EB curing, on the other hand, faces limitations in its engineering application due to its advanced technology, high industrial application costs, difficulty in controlling the stability of equipment and process technology, and the near absence of domestically available coating materials. However, due to the complexity of film production processes, methods such as thermosetting, UV curing, or EB curing often suffer from low production efficiency due to long curing times or complex processes, making it difficult to meet the increasing market demand and resulting in films that lack superior performance. Combining the three curing methods is also challenging due to the complexity of the equipment structure, the significant differences in curing technologies, and the high technical difficulty; currently, no company in the industry possesses equipment capable of simultaneously supporting all three curing methods.

[0003] Therefore, there is an urgent need to develop a new continuous film production method that can improve film production efficiency while ensuring excellent overall film performance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a vinyl-terminated polyurethane film, its continuous production method, and its applications.

[0005] This invention provides a continuous production method for vinyl-terminated polyurethane films, comprising sequentially passing a substrate material through 1-2 stages of thermosetting, 2-5 stages of UV curing, and 1-2 stages of EB curing.

[0006] Furthermore, the continuous production method specifically includes the following steps:

[0007] S1: Apply a thermosetting resin material to the substrate material once, with a coating thickness of 5-10 micrometers. Control the oven temperature at 60-65℃ and allow the coating to remain in the oven for 5-15 seconds, performing 1-2 stages of thermosetting.

[0008] S2: The UV curing process is carried out in 2-5 stages. The UV-curable resin material is coated onto the surface of the substrate material, with each coating layer being 5-10 micrometers in size. A surface cured layer is formed through UV curing. The UV curing energy is 200-300 mJ / cm². 2 ;

[0009] S3: Coat with EB curing resin material once to form a thin resin layer of 10-20 micrometers, and cure under EB curing conditions, wherein the EB curing voltage is 110-150keV and the dosage is 3-30KGy, and perform 1-2 stages of EB curing process to fully cure the functional coating and obtain a decorative multilayer composite film.

[0010] The coating process in thermosetting, UV curing, and EB curing can be performed by roller coating, for example, using a micro-grooved roller or anilox roller.

[0011] Currently, the industry struggles to achieve continuous production using a combination of these three methods, and no other company has yet introduced EB radiation processing technology for coating curing and polymer crosslinking modification of plastic films. This invention utilizes a gradient progressive curing process with three curing methods, enabling each coating to achieve a fully crosslinked network structure. By combining the excellent adhesion of thermosetting coatings to the substrate, the high tensile strength of UV coatings, and the high hardness of EB coatings, a coating with excellent overall performance is obtained. Simultaneously, it solves the common industry technical problem of the contradiction between surface hardness and high tensile strength.

[0012] In this invention, step S1 enhances the adhesion between the coating and the substrate material through thermosetting coating, while simultaneously improving the surface hardness of the substrate material. Step S2 employs UV layering and curing to address the high tensile properties of the UV coating, as well as the surface hardness and color issues of the substrate material. Step S3 utilizes EB curing, first curing the EB curing resin material, and then further curing and cross-linking the incompletely cured coating material from step S2. Step S3, while ensuring hardness and scratch resistance, further optimizes gloss and enriches the appearance. This invention, through a specific combination of thermosetting, UV curing, and EB curing, produces a plastic film suitable for vacuum forming of curved profiles, exhibiting high tensile strength at break, high hardness, and excellent scratch resistance.

[0013] The gradient coating technology of UV curing layer can improve the tensile properties of the coating, increase the surface hardness of the base film, and because of the layered coating of UV curing layer, the color of each layer of paint can be adjusted by computer design at each stage to obtain a more layered surface and improve the appearance of decorative panel.

[0014] The UV curing process is slower than the EB irradiation curing process and is difficult to match. This invention prepares a thin UV layer in multiple stages, which can ensure that the UV coating is sufficient, so that the UV curing layer can adapt to the EB irradiation curing process and improve the production speed.

[0015] This invention endows functional material layers with properties different from those in a single curing process through multiple curing methods, providing more options for process optimization.

[0016] Furthermore, in step S2, the curing time of each UV-curable resin layer is 0.5-3 seconds, and in step S3, the EB curing time is 0.1-1 seconds.

[0017] Furthermore, the conveying (transporting) speed of the plastic film is 20-80 m / min, such as 20, 25, 30, 35, 40, 45, 50, 60, 70, 80 m / min.

[0018] Furthermore, in step S2, the thickness of the UV-cured surface resin layer is less than or equal to 40 micrometers.

[0019] Further, the UV-curable resin material, by weight, comprises the following components: 30-50 parts of difunctional aliphatic polyurethane resin, such as 30, 35, 40, 45, or 50 parts; 20-40 parts of trifunctional aliphatic polyurethane resin, such as 20, 25, 30, 35, or 40 parts; 0-10 parts of monofunctional active monomer, such as 0, 1, 2, 4, 6, 8, or 10 parts; 5-10 parts of difunctional active monomer, such as 5, 6, 7, 8, 9, or 10 parts; 1-2 parts of photoinitiator, such as 1, 1.2, 1.4, 1.5, 1.8, or 2 parts; 0.2-0.5 parts of additives, such as 0.2, 0.3, 0.4, or 0.5 parts; 0-10 parts of solvent, such as 0, 5, 8, or 10 parts; and 0-10 parts of ink, such as 0, 2, 4, 5, 6, 7, 8, 9, or 10 parts.

[0020] Furthermore, the bifunctional aliphatic polyurethane resin includes, but is not limited to, any one or more of the following: Changxing Company's 6148J-75, DR-U241, DR-U377, 6113, and Sartoma's CN966J75, CN9001, CN964, CN965.

[0021] Furthermore, the trifunctional aliphatic polyurethane resin includes, but is not limited to, any one or more of DR-U010 and DR-U265 from Changxing Company, and CN989 and CN8009 from Sartoma.

[0022] Furthermore, the monofunctional active monomers include, but are not limited to, any one or more of THFA (tetrahydrofurfuryl acrylate), IBOA (isobornyl acrylate), CTFA (cyclotrimethylolpropane formal acrylate), BZA (benzyl acrylate), and EOEOEA (ethoxyethoxyethyl acrylate).

[0023] Furthermore, the bifunctional active monomers include, but are not limited to, any one or more of HDDA (1,6-hexanediol diacrylate), TEGDA (triethylene glycol diacrylate), and TPGDA (tripropylene glycol diacrylate).

[0024] Furthermore, the photoinitiator includes, but is not limited to, any one or more of 184 (hydroxycyclohexylphenyl ketone), 1173 (hydroxydimethyl acetophenone), and TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide).

[0025] Furthermore, the additives include, but are not limited to, any one or more of the following: defoamer BYK088, leveling agent DC57, wax emulsion AQUACER513, BYK Chemical's 361N and 3560, and TIGAO's TEGO 270, TEGO 920, and TEGO 2100.

[0026] Furthermore, the solvent includes, but is not limited to, any one or more of ethyl acetate, butyl acetate, butanone, and isopropanol.

[0027] Further, the EB-cured resin material comprises, by weight, the following components: 30-90 parts of vinyl-terminated polyurethane prepolymer, such as 30, 35, 40, 45, 50, 60, 70, 80, or 90 parts; 10-40 parts of reactive diluent, such as 10, 15, 20, 25, 30, 35, or 40 parts; and 0.5-15 parts of additives, such as 0.5, 1, 2, 4, 8, 10, 12, or 15 parts.

[0028] Furthermore, the vinyl-terminated polyurethane prepolymer is selected from one or both of prepolymer A and prepolymer B;

[0029] The structure of the prepolymer A is as follows:

[0030] ;

[0031] in, ;

[0032] The structure of the prepolymer B is as follows:

[0033] .

[0034] Preferably, the vinyl-terminated polyurethane prepolymer is selected from a composition of prepolymer A and prepolymer B in a mass ratio of (0.4-2.5):1.

[0035] Furthermore, the reactive diluent is an acrylate monomer containing a double bond, wherein the acrylate monomer is selected from any one or more of monofunctional acrylate monomers, difunctional acrylate monomers, or polyfunctional acrylate monomers.

[0036] The monofunctional acrylate monomers include, but are not limited to, any one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, isobornyl acrylate, and isobornyl methacrylate; the difunctional acrylate monomers include, but are not limited to, neopentyl glycol diacrylate, hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, tripropylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, and neopentyl glycol diacrylate. The polyfunctional acrylate monomers include, but are not limited to, trimethylolpropane triacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, dipentaerythritol hexaacrylate, propoxylated trimethylolpropane triacrylate, propoxylated glycerol triacrylate, propoxylated glycerol trimethacrylate, triallyl triisocyanate, and trimethylallyl triisocyanate.

[0037] Furthermore, the additive is any one or more of the following: dispersant, leveling agent, defoamer, antioxidant, adhesion promoter, heat stabilizer, filler, or pigment.

[0038] The dispersant includes, but is not limited to, any one or more of N,N'-ethylene bis-stearamide, Efka EFKA-4560, BYK-110, BYK-111, BYK-112, and BYK-116; the leveling agent includes, but is not limited to, any one or more of BYK-350, BYK331, BYK333, and AFCONA3034; the defoamer includes, but is not limited to, any one or more of BYK-1790, BYK052, BYK055, and AFCONA2022; the antioxidant includes, but is not limited to, 1010; the adhesion promoter includes, but is not limited to, any one or more of silane coupling agents, titanate silane coupling agents, Dow Corning 6030, and FM135; the heat stabilizer includes, but is not limited to, any one or more of rare earth / calcium / zinc composite heat stabilizer, dibutyltin dilaurate, zinc stearate, aluminum stearate, and aluminum distearate; the filler includes, but is not limited to, ultraviolet-absorbing inorganic particles; and the pigment includes, but is not limited to, titanium dioxide.

[0039] Furthermore, the thermosetting resin material can be selected with the same formulation as the UV-curable resin material or the EB-curable resin.

[0040] Furthermore, the preparation method of the prepolymer A includes the following steps:

[0041] S1: Preparation of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1;

[0042] S2: Add 1 mol of tetra-armed polyethylene glycol, 4.1-4.4 mol of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 and 0.1-0.6 mol of p-toluenesulfonic acid to a four-necked flask equipped with a water separator, a feeding funnel and a mechanical stirrer. Then heat the mixture to 130-150℃ and react for 3.5-5 hours to obtain a pale yellow oily compound 2.

[0043] S3: Using dry polytetrahydrofuran as solvent, 1 mol of compound 2 was added to a three-necked round-bottom flask. After installing a stirrer and thermometer, N2 was introduced for gas protection, and the mixture was stirred at 45-60℃ for 25-32 min. Subsequently, the temperature was raised to 70-84℃, and 4.1-4.4 mol of isophorone diisocyanate (IPDI) was added to the flask. The temperature was then raised to 85-90℃, and 0.05-0.1 mol of dibutyltin dilaurate catalyst (DBTDL) was added. The mixture was reacted under mechanical stirring for 1.5-2 h to obtain polyurethane intermediate 3.

[0044] S4: Add 2.1-2.2 mol of diisocyanate to the flask and react at 78-85℃ for 2.5-4 h with mechanical stirring;

[0045] S5: Adjust the temperature to 50-60℃ and react with 0.9-1.3 mol of hydroxyethyl methacrylate (HEMA) for 1.5-3 hours to obtain prepolymer A.

[0046] In step S4, the diisocyanate is any one or more of the following: dicyclohexane 4,4'-diisocyanate, 1,4-butyl diisocyanate, 1,4-cyclohexyl diisocyanate, o-toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, N,N'-2-tris(6-isocyanate-hexyl)iminodiacarbonate diamide, and diisocyanate.

[0047] The molecular weight of each arm of the four-arm polyethylene glycol is 2000-20000, such as 2000, 5000, 10000, 20000.

[0048] The preparation method of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 includes the following steps:

[0049] In a four-necked flask equipped with helium protection, a condenser, and mechanical stirring, 1.0-1.5 mol of methyl acrylate and 1.01-1.51 mol of diethanolamine were added to 200-250 mL of methanol as solvent. The mixture was stirred for 28-35 min at room temperature under nitrogen protection, and then heated to 38-45℃ for 4-4.5 h. The methanol was removed by distillation to obtain colorless and transparent N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1. The reaction formula is as follows:

[0050] .

[0051] Furthermore, the preparation method of the prepolymer B includes the following steps:

[0052] 1 mol of four-arm polyethylene glycol isocyanate and 4.1-4.4 mol of hydroxyethyl methacrylate (HEMA) were added to a four-necked flask equipped with a water separator, a feeding funnel, and a mechanical stirrer. The mixture was then reacted at 58-65°C for 3.5-5 h to obtain prepolymer B. The reaction formula is as follows:

[0053] ;

[0054] The molecular weight of each arm of the four-arm polyethylene glycol isocyanate is 2000-20000, such as 2000, 5000, 10000, 20000.

[0055] Furthermore, the preparation method of the EB-cured resin material includes the following steps:

[0056] Weigh out the vinyl-terminated polyurethane prepolymer, reactive diluent, and additives according to the specified weight, mix them evenly, and disperse them in a high-speed disperser at 2800-3500 rpm for 70-85 minutes to obtain the coating composition.

[0057] The present invention also provides a vinyl-terminated polyurethane film, which is produced by the aforementioned continuous production method.

[0058] The present invention also provides the thermoforming application of the vinyl-terminated polyurethane film in curved profiles.

[0059] In summary, compared with the prior art, the present invention achieves the following technical effects:

[0060] (1) The continuous production method provided by the present invention enables the film to be easily transported through the conveying device. By conveying the film through the thermosetting, UV curing, coating and EB curing areas, the film can move quickly on the production line, improving production efficiency. Compared with the original production method which requires multiple workshops and multiple equipment, the present invention connects the various curing processes, eliminating the need for additional transportation, and forms a continuous production mode. The film can move continuously and quickly on the production line, thus greatly improving production efficiency.

[0061] (2) The continuous production method provided by the present invention can ensure that the plastic film produced not only has high hardness, but also excellent scratch resistance and tensile properties. Detailed Implementation

[0062] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 should fall within the scope of protection of the present invention.

[0063] Example

[0064] The present invention will be further illustrated below with reference to specific embodiments and comparative embodiments. The following specific embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments, and are not in particular limited to the types of raw materials used in the following specific embodiments.

[0065] I. The sources of raw materials for the examples and comparative examples are as follows:

[0066] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this invention are all commercially available.

[0067] The preparation method of prepolymer A used in the EB curing resin material in the embodiments and comparative examples of the present invention is as follows:

[0068] S1: 1 mol of four-arm polyethylene glycol (molecular weight of each arm is 2000), 4.1 mol of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 and 0.3 mol of p-toluenesulfonic acid were added to a four-necked flask equipped with a water separator, a feeding funnel and a mechanical stirrer. The mixture was heated to 140°C and reacted for 4 hours to obtain a pale yellow oily compound 2.

[0069] S2: Using dry polytetrahydrofuran as solvent, 1 mol of compound 2 was added to a three-necked round-bottom flask. After installing a stirrer and thermometer, N2 was introduced for gas protection, and the mixture was stirred at 55°C for 30 min. Subsequently, the temperature was raised to 80°C, and 4.2 mol of isophorone diisocyanate (IPDI) was added to the flask. The temperature was then raised to 85°C, and 0.08 mol of dibutyltin dilaurate (DBTDL) was added as a catalyst. The mixture was reacted under mechanical stirring for 1.5 h to obtain polyurethane intermediate 3.

[0070] S3: Add 2.1 mol of isophorone diisocyanate (IPDI) to the flask and react at 85°C for 3 h with mechanical stirring;

[0071] S4: Adjust the temperature to 55℃ and react with 1 mol of hydroxyethyl methacrylate (HEMA) for 2 h to obtain prepolymer A;

[0072] The preparation method of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 is as follows:

[0073] In a four-necked flask equipped with helium protection, a condenser, and a mechanical stirrer, 1 mol of methyl acrylate and 1.01 mol of diethanolamine were added to 200 mL of methanol as solvent. The mixture was stirred for 30 min at room temperature and under nitrogen protection, and then heated to 40 °C for 4 h. Methanol was removed by distillation to obtain colorless and transparent N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1.

[0074] The preparation method of prepolymer B used in the EB curing resin material in the embodiments and comparative examples of the present invention is as follows:

[0075] 1 mol of four-arm polyethylene glycol isocyanate (with a molecular weight of 5000 per arm) and 4.1-4.4 mol of hydroxyethyl methacrylate (HEMA) were added to a four-necked flask equipped with a water separator, a feeding funnel, and a mechanical stirrer. The mixture was reacted at 60°C for 4 h to obtain vinyl-terminated polyurethane prepolymer B.

[0076] The preparation methods of the EB-cured resin materials in the embodiments and comparative examples of the present invention are as follows:

[0077] Weigh prepolymer A and prepolymer B by weight and mix them to obtain 50 g of vinyl-terminated polyurethane prepolymer. Add 10 g of hydroxypropyl acrylate, 10 g of hexanediol diacrylate, 10 g of trimethylolpropane triacrylate as an active diluent, and 1 g of N,N'-ethylene bis-stearamide, 2 g of BYK331, and 2 g of BYK-1790 additives and mix thoroughly. Disperse the mixture in a high-speed disperser at 3000 rpm for 80 minutes to obtain EB-cured resin material.

[0078] The UV-curable resin materials of the embodiments and comparative examples of this invention were prepared by blending. The UV-curable resin materials of the embodiments and comparative examples comprise the following components: 40 parts by weight of difunctional aliphatic polyurethane resin 6148J-75, 30 parts by weight of trifunctional aliphatic polyurethane resin DR-U010, 5 parts by weight of difunctional reactive monomer (reactive diluent) TPGDA, 1 part by weight of photoinitiator TPO (ethyl 2,4,6-trimethylbenzoylphenylphosphonate), 0.1 parts by weight of defoamer BYK088, 0.2 parts by weight of leveling agent DC57, 0.1 parts by weight of wax emulsion AQUACER 513, and 5 parts by weight of ethyl acetate solvent.

[0079] The thermosetting resin materials used in the embodiments and comparative examples of this invention are the same as those used in the UV-curing resin materials.

[0080] II. Performance Testing Methods

[0081] (1) Scratch resistance: The test standard is ISO1518-2:1992. The diameter of the steel needle and steel ball used in the test is 1 mm. An electric scratch tester is used to perform a unidirectional scratch test on the coating surface at a speed of 20 mm / s. The scratch length is 50 mm. The test is repeated 3-5 times and the average value is taken. The load when the steel needle is scratched is continuously increased. The load when the coating is first scratched by the steel needle is recorded as an indicator of the coating's scratch resistance. The greater the load, the better the scratch resistance.

[0082] (2) Hardness performance test: The test shall be conducted in accordance with the standard GB / T 17657-2013.

[0083] (3) Coating elongation at break performance test: The test shall be conducted in accordance with the standard GB / T 1040.3-2006.

[0084] (4) Interlayer adhesion test between coating and substrate: Refer to the method of "Determination of Coating Adhesion" in Chapter 4.56 of GB / T17657-2013; use a cross-cut tester to make 100 cross-cuts and use 3M tape to test the adhesion between the coating and the substrate. Grade 0 is the best and grade 5 is the worst.

[0085] Table 1. Technical solutions and effects of the embodiments and comparative examples

[0086]

[0087] The film transport speed was tested under the following curing conditions: thermosetting conditions: temperature 60-65℃, total thickness 10 μm; UV curing conditions: energy 220 mJ / cm². 2 The single-layer thickness is 6 μm and the total thickness is 30 μm. The EB curing conditions are: voltage 120 KeV, dosage 20 KGy, prepolymer A / B mass ratio 7:3, and total thickness 10 μm. Curing experiments were conducted.

[0088] Table 2. Analysis of the impact of conveying speed on performance

[0089]

[0090] When the conveying speed during the production process is below 20 m / min, flow marks are likely to occur; when it is above 80 m / min, the curing effect begins to decrease and become incomplete, the hardness and scratch resistance gradually weaken, and bubbles and shrinkage cavities appear.

[0091] In Examples 1-5, the films were prepared using the specific production method of this application. The resulting film coatings have excellent scratch resistance, reaching 2000 or higher, and also have high tensile strength at break, reaching 200% or higher. Furthermore, the film prepared by the production method of this application not only enables continuous production but also significantly improves the production speed, which is beneficial for industrial production.

[0092] Comparative Examples 1-3 were all compared with Example 5. Comparative Example 1 did not use EB curing to prepare the film, Comparative Example 2 did not use UV curing to prepare the film, and Comparative Example 3 did not use thermal curing to prepare the film. None of them could prepare a vinyl-terminated polyurethane film with high hardness, high scratch resistance and high elongation at break.

[0093] Based on the test data in Tables 1 and 2, it can be seen that the thin films produced by the preparation methods of Examples 1-5 have significant advantages over the comparative examples and can effectively meet the high standards of customers and the market.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous process for the production of a vinyl-terminated polyurethane film, characterized in that, The method comprises sequentially subjecting the base material to 1-2 thermal curing processes, 2-5 UV light curing processes and 1-2 EB curing processes. The method comprises the following steps: S1: coating the base material with a thermal curing resin material once, the coating thickness being 5-10 microns, the oven temperature being controlled at 60-65 DEG C, the coating being subjected to 1-2 thermal curing processes in the oven for 5-15 s; S2: the UV photocuring process is carried out in 2-5 stages, the UV photocuring resin material is coated to the surface of the base material, the coating of each coating is 5-10 microns, and a surface curing layer is formed by UV photocuring, wherein the energy of the UV photocuring is 200-300 mJ / cm 2 ; S3: coating the base material with an EB curing resin material once to form a 10-20 micron thin layer of resin, the EB curing voltage being 110-150 KeV and the dose being 3-30 KGy, the base material being subjected to 1-2 EB curing processes; The UV light curing resin material is composed of the following components by weight: a difunctional aliphatic polyurethane resin 30-50 parts a trifunctional aliphatic polyurethane resin 20-40 parts a monofunctional active monomer 0-10 parts a difunctional active monomer 5-10 parts a photoinitiator 1-2 parts an auxiliary agent 0.2-0.5 parts a solvent 0-10 parts; The EB curing resin material is composed of the following components by weight: a vinyl-terminated polyurethane prepolymer 30-90 parts an active diluent 10-40 parts an auxiliary agent 0.5-15 parts; The conveying speed of the plastic film is 20 80 m / min; The vinyl-terminated polyurethane prepolymer is selected from prepolymer B, the structure of which is as follows: 。 2. The continuous production process according to claim 1, characterized in that, The curing time of each UV light curing resin layer in step S2 is 0.5-3 s, and the EB curing time in step S3 is 0.1-1 s.

3. The continuous production process according to claim 1, characterized in that, The thickness of the UV light curing surface resin layer in step S2 is less than or equal to 40 microns.

4. A vinyl-terminated polyurethane film, characterized in that, The method is produced by the continuous production method of any one of claims 1-3.

5. The vinyl-terminated polyurethane film of claim 4 for use in the application of vacuum forming to a curved profile.

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