Vinyl-terminated polyurethane film as well as continuous production method and application thereof

Abstract

The invention discloses a vinyl-terminated polyurethane film as well as a continuous production method and application thereof, and relates to the technical field of film production, and a substrate material is sequentially subjected to 1-2 sections of thermocuring process, 2-5 sections of UV photocuring process and 1-2 sections of EB curing process. According to the continuous production method of the vinyl-terminated polyurethane film, the production speed of the film can be remarkably increased, and meanwhile it is guaranteed that a coating has excellent scratch resistance, hardness and elongation at break.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film production, in particular to a vinyl-terminated polyurethane film, a continuous production method thereof and application. BACKGROUND

[0002] The defects of the current thermal curing technology are that heat transfer is gradually performed from the surface of the coating to the inside, which can lead to incomplete curing or uneven curing of the inside of the coating, thereby affecting the overall performance and quality stability of the coating, especially in some thick coatings or coatings of large plastic film products, this problem is more prominent, if the coating is cured by UV curing technology, although it can solve the defect of uneven curing to a certain extent, but due to the need to add a specific photoinitiator, some initiators have stability problems, which can also affect the performance of the final product. Moreover, the UV light has limited penetration ability and is color sensitive, which is difficult to cure thick layers or dark materials, resulting in incomplete curing of the bottom layer. When curing multiple layers, structural defects can occur due to the uncured bottom layer. In addition, it is difficult to control the uniformity of the UV light source, and uneven curing can easily occur. The UV equipment has high energy consumption, and the long-term operation cost is significant. EB curing is restricted by its engineering application due to its advanced technology, high industrial application cost, difficulty in controlling the stability of equipment and process technology, and almost no matching coating materials in China. Due to the complexity of the film production process, the use of thermal curing, UV curing or EB curing or due to the long curing time or complex process makes the film production efficiency low, which is difficult to meet the increasing use demand of the market, and the prepared film is also difficult to obtain excellent performance. Due to the complexity of the equipment structure, it is difficult to coordinate the combination of the three curing methods, and the curing methods have great technical differences and high technical difficulty, so there is no enterprise in the industry that can simultaneously satisfy the three curing methods.

[0003] Therefore, it is urgent to develop a new continuous film production method to improve the film production efficiency while ensuring excellent comprehensive performance of the film. SUMMARY

[0004] In view of the defects in the prior art, the present application provides a vinyl-terminated polyurethane film, a continuous production method thereof and application.

[0005] The present application provides a continuous production method of a vinyl-terminated polyurethane film, which comprises sequentially subjecting a base material to 1-2 stages of thermal curing process, 2-5 stages of UV light curing process and 1-2 stages of EB curing process.

[0006] Further, the continuous production method specifically comprises the following steps: S1: coating the base material with a thermosetting resin material once, the coating thickness being 5-10 microns, the oven temperature being controlled at 60-65 DEG C, the coating being in the oven for 5-15 s, and the thermosetting process being performed in 1-2 stages.

[0007] S2: performing a UV light curing process in 2-5 stages, coating the base material surface with a UV light curing resin material, the coating thickness being 5-10 microns each time, and forming a surface curing layer by UV light curing, wherein the UV light curing energy is 200-300 mJ / cm 2 ; S3: coating an EB curing resin material once to form a 10-20 micron thin layer resin, and curing under EB curing conditions, wherein the EB curing voltage is 110-150 KeV, the dose is 3-30 KGy, the EB curing process is performed in 1-2 stages, the functional coating is completely cured, and a decorative multilayer composite film is obtained. The coating in the thermosetting, UV light curing and EB curing may, for example, be performed by roll coating using a micro-concave roller, an anilox roller, etc.

[0008] The current industry is difficult to continuously produce by using the three combined ways, and no other enterprise in the industry has introduced EB radiation processing technology for coating curing and high polymer crosslinking modification of plastic films. The present application uses the gradient progressive curing of the three curing methods to completely cure the crosslinked structure of each coating of the three curing methods, and uses the characteristics of good adhesion of the thermosetting coating to the base material, large tensile properties of the UV coating and strong hardness of the EB coating to obtain a coating with good comprehensive performance. Meanwhile, the contradiction between surface hardness and high tensile rate and other industrial common technical problems are solved.

[0009] The step S1 of the present application improves the adhesion of the coating to the base material by using a thermosetting coating, and further improves the surface hardness of the base material. The step S2 solves the high tensile properties of the UV coating by using UV layer-by-layer coating and curing, and solves the surface hardness and color problems of the base material. The step S3 uses EB curing to cure the EB curing resin material, and further cures and crosslinks the coating material which is not completely cured in the step S2. The step S3 can further optimize the gloss and enrich the appearance effect on the basis of ensuring the hardness and scratch resistance. The plastic film prepared by the specific combination of thermosetting, UV light curing and EB curing can be used for suction forming processing in curved profiles, and has high tensile elongation, high hardness and excellent scratch resistance.

[0010] The gradient coating technology of the UV light curing layer can improve the tensile property of the coating, improve the surface hardness of the base film, and due to the layered coating of the UV light curing layer, the coating color of each layer can be adjusted at each stage through computer design, so that a more hierarchical surface is obtained, and the appearance effect of the decorative panel is improved.

[0011] The UV light curing process is slower than the EB irradiation curing process, and it is difficult to match. The present application can ensure sufficient UV coating by preparing thin layer UV layers in multiple times, so that the UV light curing layer adapts to the EB irradiation curing process, and the production speed is improved.

[0012] The present application gives functional material layers different properties from those in a single curing process through multiple curing methods, providing more options for optimizing the process.

[0013] Further, the curing time of each layer of UV light curing resin layer in step S2 is 0.5-3 seconds, and the EB curing time in step S3 is 0.1-1 second.

[0014] Further, the conveying speed of the plastic film is 20-80 m / min, such as 20, 25, 30, 35, 40, 45, 50, 60, 70, 80 m / min.

[0015] Further, the thickness of the UV light curing surface resin layer in step S2 is less than or equal to 40 microns.

[0016] Further, the UV light curing resin material comprises the following components by weight: 30-50 parts of difunctional aliphatic polyurethane resin, such as 30, 35, 40, 45, 50 parts; 20-40 parts of trifunctional aliphatic polyurethane resin, such as 20, 25, 30, 35, 40 parts; 0-10 parts of monofunctional active monomer, such as 0, 1, 2, 4, 6, 8, 10 parts; 5-10 parts of difunctional active monomer, such as 5, 6, 7, 8, 9, 10 parts; 1-2 parts of photoinitiator, such as 1, 1.2, 1.4, 1.5, 1.8, 2 parts; 0.2-0.5 parts of auxiliary agent, such as 0.2, 0.3, 0.4, 0.5 parts; 0-10 parts of solvent, such as 0, 5, 8, 10 parts; 0-10 parts of ink, such as 0, 2, 4, 5, 6, 7, 8, 9, 10 parts.

[0017] Further, the difunctional aliphatic polyurethane resin includes but is not limited to any one or more of Changxing Company's 6148J-75, DR-U241, DR-U377, 6113, Sartomer's CN966J75, CN9001, CN964, CN965.

[0018] Further, the tri-functional aliphatic urethane resin includes, but is not limited to, any one or more of DR-U010, DR-U265 of DKS Co., Ltd., CN989, CN8009 of Sartomer.

[0019] Further, the mono-functional reactive monomer includes, but is not limited to, any one or more of THFA (tetrahydrofurfuryl acrylate), IBOA (isobornyl acrylate), CTFA (cyclo tri methylene propane formal acrylate), BZA (benzyl acrylate), EOEOEA (ethoxy ethoxy ethyl acrylate).

[0020] Further, the di-functional reactive monomer includes, but is not limited to, any one or more of HDDA (1, 6-hexanediol diacrylate), TEGDA (triethylene glycol diacrylate), TPGDA (tripropylene glycol diacrylate).

[0021] Further, the photoinitiator includes, but is not limited to, any one or more of 184 (hydroxycyclohexyl phenyl ketone), 1173 (hydroxy dimethyl phenyl ketone), TPO (2, 4, 6-trimethylbenzoyl-diphenyl phosphine oxide).

[0022] Further, the adjuvant includes, but is not limited to, any one or more of defoamer BYK088, leveling agent DC57, wax emulsion AQUACER513, BYK-CH 361N, 3560, TEGO 270, TEGO 920, TEGO 2100 of TEGO-DEG.

[0023] Further, the solvent includes, but is not limited to, any one or more of ethyl acetate, butyl acetate, butanone, isopropyl alcohol.

[0024] Further, the EB curing resin material includes, by weight parts, the following components: a vinyl-terminated polyurethane prepolymer 30-90 parts, such as 30, 35, 40, 45, 50, 60, 70, 80, 90 parts; a reactive diluent 10-40 parts, such as 10, 15, 20, 25, 30, 35, 40 parts; an adjuvant 0.5-15 parts, such as 0.5, 1, 2, 4, 8, 10, 12, 15 parts.

[0025] Further, the vinyl-terminated polyurethane prepolymer is selected from one or both of prepolymer A, prepolymer B; The structure of the prepolymer A is as follows: ; wherein, ; The structure of the prepolymer B is as follows: .

[0026] Preferably, the vinyl-terminated polyurethane prepolymer is selected from a combination of Prepolymer A and Prepolymer B in a mass ratio of (0.4-2.5):1.

[0027] Further, the reactive diluent is an acrylic ester monomer containing a double bond, which is selected from any one or more of a monofunctional acrylic ester monomer, a difunctional acrylic ester monomer, or a multifunctional acrylic ester monomer.

[0028] wherein the monofunctional acrylic ester monomer includes, but is not limited to, any one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, isobornyl acrylate, isobornyl methacrylate; the difunctional acrylic ester monomer includes, but is not limited to, any one or more of 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, neopentyl glycol dimethacrylate, neopentyl glycol dipropoxy diacrylate, neopentyl glycol dipropoxy dimethacrylate, 2-methyl-1,3-propanediol diacrylate; and the multifunctional acrylic ester monomer includes, but is not limited to, any one or more of trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, dipentaerythritol hexaacrylate, propoxylated trimethylolpropane trimethacrylate, propoxylated glyceryl triacrylate, propoxylated glyceryl trimethacrylate, triallyl triisocyanate, trimethylallyl triisocyanate.

[0029] Further, the auxiliary agent is any one or more of a dispersing agent, a leveling agent, an antifoaming agent, an antioxidant, an adhesion promoter, a thermal stabilizer, a filler, or a pigment.

[0030] The dispersant includes but is not limited to any one or more of N, N'- ethylene bis stearamide, EFKA-4560, BYK-110, BYK-111, BYK-112, BYK-116; the leveling agent includes but is not limited to any one or more of BYK-350, BYK331, BYK333, AFCONA3034; the defoaming agent includes but is not limited to any one or more of BYK-1790, BYK052, BYK055, 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 agent, titanate silane coupling agent, Dow Corning 6030, FM135; the thermal stabilizer includes but is not limited to any one or more of rare earth / calcium / zinc composite thermal stabilizer, dibutyl tin dilaurate, zinc stearate, aluminum stearate, aluminum distearate; the filler includes but is not limited to inorganic particles that absorb ultraviolet rays; the pigment includes but is not limited to titanium dioxide.

[0031] Further, the thermosetting resin material can be selected with the same formula as the UV curing resin material or the EB curing resin.

[0032] Further, the preparation method of the prepolymer A includes the following steps: S1: preparing N, N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1; S2: adding 1 mol of four-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 into a four-necked flask with a water separator, a feeding funnel and mechanical stirring, and then heating the mixture to 130-150℃ for 3.5-5 hours to obtain a light yellow oil compound 2; S3: adding 1 mol of compound 2 into a three-necked round-bottom flask with dry polytetrahydrofuran as the solvent, installing a stirring paddle and a thermometer, and then passing N2 for gas protection, and stirring at 45-60℃ for 25-32 min, and then increasing the temperature to 70-84℃, and adding 4.1-4.4 mol of isophorone diisocyanate (IPDI) into the flask, continuously increasing the temperature to 85-90℃, and adding 0.05-0.1 mol of catalyst dibutyl tin dilaurate (DBTDL), and reacting for 1.5-2h under mechanical stirring to obtain a polyurethane intermediate 3; S4: adding 2.1-2.2 mol of diisocyanate into the flask, and reacting for 2.5-4h at 78-85℃ under mechanical stirring; S5: adjusting the temperature to 50-60℃, and reacting for 1.5-3h with 0.9-1.3 mol of hydroxyethyl methacrylate (HEMA) to obtain the prepolymer A.

[0033] The diisocyanate in the step S4 is any one or more of dicyclohexylmethane 4,4'-diisocyanate, 1,4-diisocyanatobutane, 1,4-cyclohexane diisocyanate, o-tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, N,N'-2-tris(6-isocyanatohexyl)imidodicarbonic diamide, and diisocyanate dimer; The single-arm molecular weight of the four-arm polyethylene glycol is 2000-20000, such as 2000, 5000, 10000, and 20000.

[0034] The preparation method of the N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 comprises the following steps: In a four-necked flask connected with helium protection, a condenser, and mechanical stirring, 200-250 mL of methanol is used as a solvent, 1.0-1.5 mol of methyl acrylate and 1.01-1.51 mol of diethanolamine are added, stirring is performed at room temperature and under nitrogen protection for 28-35 min, then the temperature is increased to 38-45℃, and reaction is performed for 4-4.5 h, methanol is removed by distillation, and colorless transparent N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 is obtained, and the reaction formula is as follows: .

[0035] Further, the preparation method of the prepolymer B comprises the following steps: In a four-necked flask connected with a water trap, a feeding funnel, and mechanical stirring, 1 mol of four-arm polyethylene glycol isocyanate and 4.1-4.4 mol of hydroxyethyl methacrylate (HEMA) are added, then reaction is performed at 58-65℃ for 3.5-5 h, and the prepolymer B is obtained, and the reaction formula is as follows: ; The single-arm molecular weight of the four-arm polyethylene glycol isocyanate is 2000-20000, such as 2000, 5000, 10000, and 20000.

[0036] Further, the preparation method of the EB curing resin material comprises the following steps: The vinyl-terminated polyurethane prepolymer, the active diluent, and the auxiliary agent are weighed by weight parts, uniformly mixed, and dispersed in a high-speed dispersion machine at 2800-3500 rpm for 70-85 min, and the coating composition is obtained.

[0037] The application further provides a vinyl-terminated polyurethane film produced by using the continuous production method.

[0038] The application further provides the application of the vinyl-terminated polyurethane film in the blister forming of a curved profile.

[0039] Compared with the prior art, the present application has the following technical effects: (1) The continuous production method provided by the present application can make the film easily pass through the conveying device. By conveying in the heat curing, UV light curing area, coating area and EB curing area, the film can quickly move on the production line, improving the production efficiency. Compared with the original production method which needs to be completed by multiple workshops and multiple devices, the present application connects each curing process without additional transportation, forming a continuous production mode. The film can continuously and quickly move on the production line, thus greatly improving the production efficiency. (2) The continuous production method provided by the present application can ensure that the plastic film prepared has not only high hardness, but also excellent scratch resistance and tensile properties. DETAILED DESCRIPTION

[0040] In order to enable personnel in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0041] EMBODIMENT The present application will be further described below in combination with specific embodiments and comparative examples. The following specific embodiments are preferred embodiments of the present application, but the embodiments of the present application are not limited by the following examples, especially not limited to the types of raw materials used in the following specific examples.

[0042] I. Raw material sources of the examples and comparative examples are as follows: The raw material substances used in the examples and comparative examples of the present application are all commercially available, unless otherwise specified.

[0043] The preparation method of prepolymer A used in the EB curing resin material in the examples and comparative examples of the present application is as follows: S1: In a four-necked flask connected with a water trap, a charging funnel and a mechanical stirrer, 1 mol of four-armed polyethylene glycol (single-arm molecular weight 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. The mixture was heated to 140℃ and reacted for 4 hours to obtain compound 2 in the form of light yellow oil; S2: 1 mol of compound 2 is added to a three-necked round-bottom flask with dry polytetrahydrofuran as the solvent, after installing a stirring paddle and a thermometer, N2 is introduced for gas protection, and stirring is performed at 55℃ for 30 min, then the temperature is raised to 80℃, 4.2 mol of isophorone diisocyanate (IPDI) is added to the flask, the temperature is continuously raised to 85℃, 0.08 mol of dibutyl tin dilaurate (DBTDL) is added as a catalyst, and reaction is performed under mechanical stirring for 1.5 h to obtain polyurethane intermediate 3; S3: 2.1 mol of isophorone diisocyanate (IPDI) is added to the flask, and reaction is performed under mechanical stirring at 85℃ for 3 h; S4: the temperature is adjusted to 55℃, and reaction is performed with 1 mol of hydroxyethyl methacrylate (HEMA) for 2 h to obtain prepolymer A; The preparation method of the N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 is as follows: In a four-necked flask connected with helium protection, a condenser and mechanical stirring, 1 mol of methyl acrylate and 1.01 mol of diethanolamine are added to 200 mL of methanol as a solvent, stirring is performed at room temperature and under nitrogen protection for 30 min, then the temperature is raised to 40℃, and reaction is performed for 4 h, methanol is removed by distillation, and colorless transparent N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 is obtained.

[0044] The preparation method of the prepolymer B used in the EB curing resin material in the examples and comparative examples of the present application is as follows: In a four-necked flask connected with a water trap, a feeding funnel and mechanical stirring, 1 mol of four-arm polyethylene glycol isocyanate (the molecular weight of a single arm is 5000) and 4.1-4.4 mol of hydroxyethyl methacrylate (HEMA) are added, reaction is performed at 60℃ for 4 h, and a vinyl-terminated polyurethane prepolymer B is obtained.

[0045] The preparation method of the EB curing resin material in the examples and comparative examples of the present application is as follows: Prepolymer A and prepolymer B are weighed according to the weight parts and mixed to obtain 50 g of a vinyl-terminated polyurethane prepolymer, 10 g of an active diluent of hydroxypropyl acrylate, 10 g of hexanediol diacrylate, 10 g of trimethylolpropane triacrylate, and 1 g of N,N'-ethylene bis-stearamide, 2 g of BYK331, and 2 g of BYK-1790 are added, and the mixture is fully mixed, dispersed in a high-speed dispersion machine at 3000 rpm for 80 min, and an EB curing resin material is obtained.

[0046] The UV curing resin material of the embodiment and the comparative example is prepared by blending. The UV curing resin material of the embodiment and the comparative example comprises the following components: 40 parts by weight of a bifunctional aliphatic polyurethane resin 6148J-75, 30 parts by weight of a trifunctional aliphatic polyurethane resin DR-U010, 5 parts by weight of a bifunctional active monomer (active diluent) TPGDA, 1 part by weight of a photoinitiator TPO (2, 4, 6-trimethylbenzoyl phenyl ethyl phosphonate), 0.1 part by weight of a defoaming agent BYK088, 0.2 parts by weight of a leveling agent DC57, 0.1 part by weight of a wax emulsion AQUACER 513, and 5 parts by weight of an ethyl acetate solvent.

[0047] The thermal curing resin material of the embodiment and the comparative example has the same formula as the UV curing resin material.

[0048] II. Performance test methods (1) Scratch resistance: The test standard is ISO 1518-2:1992, the test uses a steel needle with a steel ball diameter of 1 mm, a motorized scratch tester is used to perform a one-way 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 is increased when the steel needle is continuously scratched, and the load at which the coating is first scratched by the steel needle is recorded as an index for evaluating the scratch resistance of the coating. The greater the load, the better the scratch resistance.

[0049] (2) Hardness performance test: The test is performed in accordance with the standard of GB / T 17657-2013.

[0050] (3) Coating elongation at break performance test: The test is performed in accordance with the standard of GB / T 1040.3-2006.

[0051] (4) Interlayer adhesion test between coating and substrate: The method is referred to the section 4.56 of GB / T 17657-2013, "Paint film adhesion test"; the adhesion between the coating and the substrate is tested by a crosshatch tester and 3M tape, with 0 being the best and 5 being the worst.

[0052] Table 1 Technical solutions and effects of the embodiment and the comparative example

[0053] The following curing conditions are used to test the film conveying speed: thermal curing conditions: temperature 60-65℃, total thickness 10 μm, UV curing conditions: energy 220 mJ / cm 2 , single layer thickness 6 μm, total thickness 30 μm, EB curing conditions: voltage 120KeV, dose 20 KGy, pre-polymer A / B mass ratio 7:3, total thickness 10 μm, and curing experiment is performed.

[0054] Table 2. Analysis table of the influence of conveying speed on performance

[0055] When the production process conveying speed is lower than 20 m / min, it is easy to appear flow mark phenomenon; higher than 80 m / min, the curing effect begins to decrease, incomplete, hardness and scratch resistance gradually weakened, and accompanied by the appearance of bubble hole, shrinkage.

[0056] The thin films in examples 1-5 are all prepared by the specific production method of the present application, the prepared film coating has excellent scratch resistance, reaching 2000 and above, also has high breaking tensile rate, reaching 200% and above, and the thin film prepared by the production method of the present application not only can be continuously produced but also can significantly improve the production speed, which is beneficial to industrialized production.

[0057] Comparative examples 1-3 are all compared with example 5, comparative example 1 does not use EB curing method to prepare the thin film, comparative example 2 does not use UV light curing method to prepare the thin film, comparative example 3 does not use heat curing method to prepare the thin film, and all of them cannot prepare the vinyl-terminated polyurethane thin film with high hardness, high scratch resistance and high elongation at break.

[0058] Based on the test data of table 1 and table 2, it is illustrated that the thin film produced by the preparation method of examples 1-5 has obvious advantages compared with comparative examples, which can effectively meet the high standard demand of customers and market.

[0059] The above only describes the preferred embodiments of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

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.

2. The continuous production method according to claim 1, characterized in that, The method comprises the following steps: S1: applying a thermal curing resin material to the base material once, with a coating thickness of 5-10 microns, an oven temperature of 60-65°C, and a coating time in the oven of 5-15 s, to perform 1-2 thermal curing processes; 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: applying an EB curing resin material once to form a thin layer of resin with a thickness of 10-20 microns, and curing under EB curing conditions, wherein the EB curing voltage is 110-150 KeV and the dose is 3-30 KGy, to perform 1-2 EB curing processes.

3. The continuous production process according to claim 2, 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.

4. The continuous production method according to claim 2, characterized in that, The thickness of the UV light curing surface resin layer in step S2 is less than or equal to 40 microns.

5. The continuous production process according to claim 2, characterized in that, The UV light curing resin material comprises 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 ink 0-10 parts.

6. The continuous production process according to claim 2, characterized in that, The EB curing resin material comprises 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.

7. The continuous production process according to claim 6, characterized in that, The vinyl-terminated polyurethane prepolymer is selected from one or both of prepolymer A and prepolymer B; The structure of prepolymer A is as follows: ； wherein ; The structure of prepolymer B is as follows: 。 8. A vinyl-terminated polyurethane film, characterized in that, The method is produced by the continuous production method of any one of claims 1-7.

9. The vinyl-terminated polyurethane film of claim 8 for use in the application of vacuum forming to a curved profile.

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