Blue-sensitive photopolymer film, method for preparing same and use thereof

Abstract

The application relates to the technical field of blue-sensitive photopolymer photosensitive materials, in particular to a blue-sensitive photopolymer film and a preparation method and application thereof. The blue-sensitive photopolymer film comprises the following preparation raw materials in parts by mass: 40-45 parts of writing monomers, 20-25 parts of polyester polyols, 14-16 parts of aliphatic isocyanate, 1-2 parts of blue light photosensitizer, 2-4 parts of photoinitiator, 5-10 parts of crosslinking agent, 5-10 parts of anti-oxidation inhibitor, 0.4-0.6 parts of catalyst, 0.5-0.6 parts of defoaming agent and 5-9 parts of solvent. The blue-sensitive photopolymer film has the characteristics of good moisture-proof effect, long storage time, high diffraction efficiency, high refractive index modulation, high sensitivity and low exposure energy, and is an ideal holographic recording material.

Description

Technical Field

[0001] This application relates to the field of blue-sensitive photopolymer photosensitive materials technology, and in particular to a blue-sensitive photopolymer thin film, its preparation method and application. Background Technology

[0002] In the field of AR waveguides, there are two types of holographic gratings: surface relief gratings and volume holographic gratings. The market for volume holographic gratings has disclosed a photopolymer formulation comprising a chemically cross-linked matrix polymer, a writing monomer, and a photoinitiator system. This photopolymer formulation can be used to produce holographic media, thereby creating bright and easily visible holograms with high refractive index difference and low thickness.

[0003] Photopolymers are a novel type of holographic material that offers advantages over conventional silver halide materials and dichromate gelatin, including superior optical properties, high cost-effectiveness, and support for large-scale production. Currently, research on red-green sensitive photopolymers is more extensive, while reports on blue-sensitive photopolymers are scarce. The reported blue-sensitive photopolymers are almost all water-soluble, using polyvinyl alcohol as a substrate and acrylamide as the writing monomer. This system exhibits low refractive index modulation, low diffraction efficiency, and is prone to deliquescence and difficult to preserve. Common water-soluble photopolymer systems are highly sensitive to environmental conditions, especially the preservation performance of holograms, which is affected by ambient temperature, humidity, and light exposure. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a blue-sensitive photopolymer film, its preparation method, and its applications. The blue-sensitive photopolymer of this application is an oil-based (non-water-soluble) blue-sensitive photopolymer system. It uses polyurethane (generated by the reaction of polyester polyol and aliphatic isocyanate) as a substrate and composite acrylate monomers as writing monomers. The resulting blue-sensitive photopolymer film exhibits excellent moisture resistance, long shelf life, high diffraction efficiency, high refractive index modulation, high sensitivity, and low exposure energy. Using the oil-based blue-sensitive photopolymer film prepared in this application to capture reflective holograms, which are then reproduced under white light, yield clear images with excellent preservation performance, making it an ideal holographic recording material.

[0005] In a first aspect, this application provides a blue-sensitive photopolymer thin film, which adopts the following technical solution:

[0006] A blue-sensitive photopolymer film, comprising, by weight parts, the following raw materials: 40-45 parts of writing monomer, 20-25 parts of polyester polyol, 14-16 parts of aliphatic isocyanate, 1-2 parts of blue light photosensitizer, 2-4 parts of photoinitiator, 5-10 parts of crosslinking agent, 5-10 parts of antioxidant inhibitor, 0.4-0.6 parts of catalyst, 0.5-0.6 parts of defoamer, and 5-9 parts of solvent.

[0007] By employing the above technical solution, the following monomers are incorporated: Monomer: As the primary reactive monomer, it participates in the photopolymerization reaction to form a polymer network structure. This determines the material's diffraction efficiency, exposure sensitivity, and optical quality. Polyester polyol: Reacts with aliphatic isocyanate to generate polyurethane, serving as the base of the polymer system and providing excellent film-forming properties and mechanical properties. Aliphatic isocyanate: Reacts with polyester polyol to generate polyurethane, serving as the base of the polymer system and providing excellent film-forming properties and mechanical properties. Blue light photosensitizer: Absorbs blue light energy, initiating the photopolymerization reaction and improving the material's exposure sensitivity. Photoinitiator: Promotes the photopolymerization reaction, improving the material's exposure sensitivity and diffraction efficiency. Crosslinking agent: Participates in the photopolymerization reaction, increasing the crosslinking density of the polymer network, improving the material's refractive index modulation and shelf life. Antioxidant inhibitor: Inhibits oxidative degradation of the material during preparation and storage, extending the material's shelf life. Catalyst: Accelerates the polyurethane formation reaction, improving the material's preparation efficiency and performance. Defoamer: Eliminates bubbles generated during preparation, improving the optical quality of the film surface. Solvent: Adjusts the viscosity of the system, facilitating coating and film formation. Through the synergistic effect of the above components, the blue-sensitive photopolymer film of the present invention has the characteristics of good moisture resistance, long storage time, high diffraction efficiency, high refractive index modulation, high sensitivity and low exposure energy, making it an ideal holographic recording material.

[0008] Preferably, the monomer being written is any two or more of N-ethylenecarbazole, ethoxylated bisphenol fluorene diacrylate, bisphenol A-dimethacrylate, pentaerythritol tetraacrylate, and ethoxylated trimethylolpropane triacrylate.

[0009] Preferably, the writing monomer includes at least N-ethylenecarbazole and bisphenol A-dimethacrylate, and the mass ratio of N-ethylenecarbazole to bisphenol A-dimethacrylate is 0.08-0.22:1.

[0010] By employing the above technical solution, firstly, N-ethylenecarbazole is a compound with high refractive index and good optical properties. It can improve the diffraction efficiency and exposure sensitivity of the film, thus making the holographic image clearer and brighter. Furthermore, N-ethylenecarbazole also has good moisture-proof properties and a long shelf life, which helps improve the preservation performance of the material. Secondly, bisphenol A-dimethacrylate is a commonly used crosslinking agent that can react with polyester polyols and aliphatic isocyanates to form a polyurethane network structure. This structure can enhance the mechanical strength and stability of the film, while improving its moisture-proof effect and shelf life. In addition, bisphenol A-dimethacrylate can also increase the refractive index modulation of the film, thereby improving the contrast and clarity of the holographic image. Finally, the synergistic effect between N-ethylenecarbazole and bisphenol A-dimethacrylate is manifested in their joint improvement of the film's diffraction efficiency and exposure sensitivity. The high refractive index and good optical properties of N-ethylenecarbazole combined with the crosslinking effect of bisphenol A-dimethacrylate enable the film to form a holographic image more quickly during exposure and has a high diffraction efficiency. Furthermore, since both N-ethylenecarbazole and bisphenol A-dimethacrylate possess moisture-proof properties and long shelf life, they collectively improve the film's preservation performance. In summary, by adding the monomers N-ethylenecarbazole and bisphenol A-dimethacrylate and controlling their mass ratio at 0.08-0.22:1, the diffraction efficiency, exposure sensitivity, optical quality, moisture-proof effect, and shelf life of the blue-sensitive photopolymer film can be significantly optimized.

[0011] Preferably, the writing monomer is composed of N-ethylenecarbazole, ethoxylated bisphenol fluorene diacrylate, and bisphenol A-dimethacrylate in a mass ratio of 0.1:1:1.

[0012] By employing the above technical solution, N-ethylenecarbazole, a compound containing a nitrogen heterocycle, exhibits good photosensitivity. In blue-sensitive photopolymer films, N-ethylenecarbazole, as part of the writing monomer, can improve the photosensitivity of the film, making it easier to undergo polymerization under blue light irradiation. Simultaneously, N-ethylenecarbazole can also improve the refractive index modulation of the film, thereby increasing diffraction efficiency. Ethylene bisphenol diacrylate (BDI) is a compound containing two acrylate groups and exhibits high reactivity. In blue-sensitive photopolymer films, BDI, as part of the writing monomer, can copolymerize with N-ethylenecarbazole and bisphenol A-dimethacrylate to form a cross-linked network structure. This structure helps improve the optical quality and material shelf life of the film. Bisphenol A-dimethacrylate, a compound containing two acrylate groups, exhibits high reactivity. In blue-sensitive photopolymer films, BDI, as part of the writing monomer, can copolymerize with N-ethylenecarbazole and BDI to form a cross-linked network structure. This structure helps improve the optical quality and material preservation time of the film. In summary, the synergistic effect among N-ethylenecarbazole, bisphenol fluorene diacrylate, and bisphenol A-dimethacrylate is mainly manifested in their joint participation in the polymerization reaction of the blue-sensitive photopolymer film, forming a cross-linked network structure, thereby improving the film's optical quality, material preservation time, and diffraction efficiency. Simultaneously, the individual characteristics of these three compounds also endow the blue-sensitive photopolymer film with good moisture resistance, high sensitivity, and low exposure rate.

[0013] Preferably, the writing monomer is composed of N-ethylenecarbazole, ethoxylated trimethylolpropane triacrylate, and bisphenol A-dimethacrylate in a mass ratio of 0.2:0.5:1.

[0014] By employing the above technical solutions, N-ethylenecarbazole, as a photosensitive monomer, has a high absorption capacity for blue light and can rapidly react under light to form free radicals, initiating the polymerization reaction. Its presence can increase the efficiency of the photoinitiator, improve the photopolymerization rate, and thus enhance the sensitivity and exposure efficiency of the material. Ethoxylated trimethylolpropane triacrylate (EO-TMPTA): EO-TMPTA is a multifunctional acrylate that provides multiple reaction sites, promoting an increase in crosslinking density. During photopolymerization, it can undergo crosslinking reactions with N-ethylenecarbazole and other monomers to form a three-dimensional network structure, which helps improve the hardness, abrasion resistance, and chemical resistance of the polymer film. Simultaneously, due to its multifunctional characteristics, EO-TMPTA can also improve diffraction efficiency and refractive index modulation. Bisphenol A-dimethacrylate (Bis-A EME): Bisphenol A-dimethacrylate is a bifunctional monomer that acts as a diluent and crosslinking agent in the system. It can adjust the viscosity of the system, making the coating process easier, and participates in the crosslinking reaction during curing, enhancing the stability of the polymer network. Furthermore, Bis-A EME can improve the optical properties of polymers, such as transparency and refractive index. In summary, the synergistic effect between N-ethylenecarbazole, ethoxylated trimethylolpropane triacrylate, and bisphenol A-dimethacrylate is mainly manifested in the following aspects: N-ethylenecarbazole provides high photosensitivity and rapid polymerization initiation. EO-TMPTA improves the density and mechanical properties of the polymer network through multifunctional crosslinking. Bis-A EME, as a diluent and crosslinking agent, adjusts the system viscosity and participates in the crosslinking reaction, while simultaneously improving optical properties. This combination not only improves the diffraction efficiency and exposure sensitivity of blue-sensitive photopolymer films but also enhances the optical quality of the film surface, material preservation time, and moisture resistance, making it an ideal holographic recording material.

[0015] Preferably, the photoinitiator is one or more of triethanolamine, N-phenyldiethanolamine and diethanolamine, with triethanolamine being the most preferred.

[0016] Preferably, the solvent is one or more of N-methylpyrrolidone (NMP), N,N-dimethylformamide (DMF), dichloromethane, chloroform, and toluene; preferably N,N-dimethylformamide (DMF).

[0017] Preferably, the antioxidant inhibitor is diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate; the crosslinking agent is N-vinylpyrrolidone (NVP); the blue light photosensitizer is acridine orange; the molecular weight of the polyester polyol is 400-3000; the aliphatic isocyanate is Wanhua HT-100; the catalyst is organic bismuth catalyst DY-20; and the defoamer is BYK-058.

[0018] Secondly, this application provides a method for preparing a blue-sensitive photopolymer film, employing the following technical solution: As a general technical concept, this application also provides the above-mentioned method for preparing a blue-sensitive photopolymer film, comprising the following steps:

[0019] In a darkroom, the solvent was first added to a flask according to the mass ratio. Then, polyester polyol, blue light photosensitizer, photoinitiator, crosslinking agent, writing monomer, antioxidant inhibitor, and defoamer were added. The temperature was heated to 80-90℃ and stirred for 24 hours. Then, aliphatic isocyanate was added and stirred for 30 minutes. Then, the catalyst was added dropwise and stirred for 1 minute to obtain a gel-like solution. The gel-like solution was then coated onto a glass substrate or PET film. After gelation, the film was defoamed under vacuum to obtain the blue-sensitive photopolymer film.

[0020] Thirdly, this application provides an application of a blue-sensitive photopolymer film, employing the following technical solution:

[0021] As a general technical concept, this application also provides the application of the above-mentioned blue-sensitive photopolymer film in AR-HUD, optical holographic storage, high-end anti-counterfeiting, AR-near-eye display and holographic sensing.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. Excellent moisture resistance: Using polyurethane as the substrate provides excellent moisture resistance, enabling the prepared blue-sensitive photopolymer film to maintain good optical performance even in humid environments.

[0024] 2. Long shelf life: By adding antioxidant inhibitors and cross-linking agents, the antioxidant properties and stability of the material are improved, thereby extending the shelf life of the material.

[0025] 3. High diffraction efficiency: By adding writing monomers, the diffraction efficiency of the blue-sensitive photopolymer film is optimized, making the holographic image clearer.

[0026] 4. Higher refractive index modulation: The polyurethane substrate is generated by reacting polyester polyols of specific molecular weight with aliphatic isocyanates, which improves the refractive index modulation and helps to improve the quality of holographic images.

[0027] 5. High sensitivity and low exposure energy: The use of blue light photosensitizer and photoinitiator improves the sensitivity of the material and reduces the exposure rate, resulting in lower light intensity required when capturing holographic images, which helps protect the sample from light damage.

[0028] 6. High optical quality of the film surface: By adding defoamer, bubbles and defects on the material surface are reduced, thus improving the optical quality of the film surface.

[0029] 7. Ideal Holographic Recording Material: The oily blue-sensitive photopolymer film prepared in this application is used to capture reflective holograms, which are then reproduced under white light to obtain clear images with good preservation performance, making it an ideal holographic recording material. Detailed Implementation

[0030] The embodiments of this application will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of this application. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0031] The following example, 1 serving, represents 10g.

[0032] Example 1

[0033] A blue-sensitive photopolymer film, by mass parts, comprises the following raw materials: 40 parts of writing monomer, 20 parts of polyester polyol (molecular weight 400), 14 parts of aliphatic isocyanate Wanhua HT-100, 1 part of acridine orange, 2 parts of diethanolamine, 5 parts of N-vinylpyrrolidone (NVP), 5 parts of diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, 0.4 parts of organic bismuth catalyst DY-20, 0.5 parts of defoamer BYK-058, and 5 parts of N-methylpyrrolidone (NMP), wherein the writing monomer is composed of 20 parts of N-ethylenecarbazole and 20 parts of pentaerythritol tetraacrylate;

[0034] The above-mentioned method for preparing a blue-sensitive photopolymer thin film includes the following steps:

[0035] In a darkroom, N-methylpyrrolidone (NMP) was first added to a flask according to the specified mass ratio. Then, polyester polyol, acridine orange, diethanolamine, N-vinylpyrrolidone (NVP), monomer, diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, and defoamer BYK-058 were added. The temperature was heated to 80°C and stirred for 24 hours. Then, aliphatic isocyanate Wanhua HT-100 was added and stirred for 30 minutes. Then, organic bismuth catalyst DY-20 was added dropwise and stirred for 1 minute to obtain a gel-like solution. The gel-like solution was then coated onto a glass substrate. After gelation, the film was defoamed under vacuum to obtain a blue-sensitive photopolymer film.

[0036] Example 2

[0037] A blue-sensitive photopolymer film, by weight, comprises the following raw materials: 45 parts of writing monomer, 25 parts of polyester polyol (molecular weight 3000), 16 parts of aliphatic isocyanate Wanhua HT-100, 2 parts of acridine orange, 4 parts of N-phenyldiethanolamine, 10 parts of N-vinylpyrrolidone (NVP), 10 parts of diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, 0.6 parts of organic bismuth catalyst DY-20, 0.6 parts of defoamer BYK-058, and 9 parts of toluene. The writing monomer is composed of 20 parts of bisphenol A-dimethacrylate and 25 parts of ethoxylated trimethylolpropane triacrylate.

[0038] The above-mentioned method for preparing a blue-sensitive photopolymer thin film includes the following steps:

[0039] In a darkroom, a light-shielding experiment was conducted. Toluene was first added to a flask according to the mass ratio, followed by polyester polyol, acridine orange, N-phenyldiethanolamine, N-vinylpyrrolidone (NVP), monomer, diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, and defoamer BYK-058. The temperature was heated to 90°C and stirred for 24 hours. Then, aliphatic isocyanate Wanhua HT-100 was added and stirred for 30 minutes. Next, organic bismuth catalyst DY-20 was added dropwise and stirred for 1 minute to obtain a gel-like solution. The gel-like solution was then coated onto a PET film. After gelation, the film was defoamed under vacuum to obtain a blue-sensitive photopolymer film.

[0040] Example 3

[0041] A blue-sensitive photopolymer film comprises, by weight parts, the following raw materials: 43 parts of writing monomer, 22 parts of polyester polyol (molecular weight 1000), 15 parts of aliphatic isocyanate Wanhua HT-100, 1.5 parts of acridine orange, 3 parts of triethanolamine, 7 parts of N-vinylpyrrolidone (NVP), 7 parts of diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, 0.5 parts of organic bismuth catalyst DY-20, 0.55 parts of defoamer BYK-058, and 7 parts of N,N-dimethylformamide (DMF). The writing monomer is composed of N-vinylcarbazole and bisphenol A-dimethacrylate in a weight ratio of 0.08:1.

[0042] The above-mentioned method for preparing a blue-sensitive photopolymer thin film includes the following steps:

[0043] In a darkroom experiment, N,N-dimethylformamide (DMF) was first added to a flask according to the specified mass ratio. Then, polyester polyol, acridine orange, triethanolamine, N-vinylpyrrolidone (NVP), monomer, diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, and defoamer BYK-058 were added. The temperature was heated to 85°C and stirred for 24 hours. Then, aliphatic isocyanate Wanhua HT-100 was added and stirred for 30 minutes. Then, organic bismuth catalyst DY-20 was added dropwise and stirred for 1 minute to obtain a gel-like solution. The gel-like solution was then coated onto a PET film. After gelation, the film was defoamed under vacuum to obtain a blue-sensitive photopolymer film.

[0044] Example 4

[0045] Same as Example 3, except that the writing monomer is composed of N-ethylenecarbazole and bisphenol A-dimethacrylate in a mass ratio of 0.22:1.

[0046] Example 5

[0047] Similar to Example 3, except that the writing monomer is composed of N-ethylenecarbazole and bisphenol A-dimethacrylate in a mass ratio of 0.12:1.

[0048] Example 6

[0049] Similar to Example 3, except that the writing monomer is composed of N-ethylenecarbazole, ethoxylated bisphenol fluorene diacrylate, and bisphenol A-dimethacrylate in a mass ratio of 0.1:1:1.

[0050] Example 7

[0051] Same as Example 3, except that the writing monomer is composed of N-ethylenecarbazole, ethoxylated trimethylolpropane triacrylate, and bisphenol A-dimethacrylate in a mass ratio of 0.2:0.5:1.

[0052] Comparative Example 1

[0053] Same as Example 3, except that the writing monomer is N-ethylenecarbazole.

[0054] Comparative Example 2

[0055] Same as Example 3, except that the monomer being written is bisphenol fluorene diacrylate ethoxylate.

[0056] Comparative Example 3

[0057] Same as Example 3, except that the writing monomer is bisphenol A-dimethacrylate.

[0058] Comparative Example 4

[0059] Same as Example 3, except that the monomer being written is ethoxylated trimethylolpropane triacrylate.

[0060] Performance testing

[0061] The blue-sensitive photopolymer films prepared in each embodiment and each comparative example were tested for the following properties, and the specific results are shown in Table 1;

[0062] Diffraction efficiency test: The prepared blue-sensitive photopolymer film was placed on the sample stage. A laser (450nm) was used as the exposure light source and as the detection light source to measure the real-time diffraction efficiency curve. During the test, the intensity of each beam of blue light (450nm) was controlled at 20mW / cm². 2 The exposure time was approximately 60 seconds. Simultaneously, blue light (450nm) was used as the detection light source, and the changes in transmitted and diffracted light intensity over time were measured. The diffraction efficiency value was then obtained using the following formula:

[0063]

[0064] Where I1 is the intensity of the diffracted light and I2 is the intensity of the transmitted light;

[0065] The refractive index modulation degree Δn is calculated as follows:

[0066]

[0067] Where λ is the wavelength of the detection light source, i.e., 450nm, 2θ is the angle between the two green light beams, and η max The maximum diffraction efficiency is given by d, where d is the film thickness.

[0068] Method for calculating photosensitivity S:

[0069]

[0070] Where η max denoted as the maximum diffraction efficiency, E is the exposure amount when the diffraction efficiency reaches its maximum, and d is the film thickness.

[0071] Table 1 Performance Tests

[0072]

[0073] Analyzing the data in Table 1, we can see that:

[0074] 1) The blue-sensitive photopolymer films prepared in Examples 1-7 exhibit good moisture resistance, long shelf life, high diffraction efficiency, high refractive index modulation, high sensitivity, and low exposure energy. Using the oily blue-sensitive photopolymer films prepared in this application to capture reflective holograms, which are then reproduced under white light, clear images are obtained with good preservation performance, making it an ideal holographic recording material.

[0075] 2) The performance comparison analysis of the blue-sensitive photopolymer films prepared in Examples 3-5 and Comparative Examples 1 and 3 shows that the writing monomer is composed of N-ethylenecarbazole and bisphenol A-dimethacrylate in a mass ratio of 0.08-0.22:1. By utilizing the synergistic effect between N-ethylenecarbazole and bisphenol A-dimethacrylate and controlling their mass ratio to 0.08-0.22:1, the performance indicators of the blue-sensitive photopolymer film, such as diffraction efficiency, exposure sensitivity, refractive index modulation, exposure energy, and storage time, can be greatly optimized.

[0076] 3) A comparative analysis of the performance of the blue-sensitive photopolymer films prepared in Example 6 and Comparative Examples 1-3 shows that the writing monomers are composed of N-ethylenecarbazole, bisphenol fluorene diacrylate ethoxylate, and bisphenol A-dimethacrylate in a mass ratio of 0.1:1:1. Utilizing the synergistic effect among N-ethylenecarbazole, bisphenol fluorene diacrylate ethoxylate, and bisphenol A-dimethacrylate, they jointly participate in the polymerization reaction of the blue-sensitive photopolymer film, forming a cross-linked network structure, thereby improving the optical quality, material preservation time, and diffraction efficiency of the film. This significantly optimizes the diffraction efficiency, exposure sensitivity, refractive index modulation, exposure energy, and preservation time of the blue-sensitive photopolymer film.

[0077] 4) The performance comparison analysis of the blue-sensitive photopolymer films prepared in Example 7 and Comparative Examples 1, 3 and 4 shows that the writing monomer is composed of N-ethylenecarbazole, ethoxylated trimethylolpropane triacrylate and bisphenol A-dimethacrylate in a mass ratio of 0.2:0.5:1. By utilizing the synergistic effect between N-ethylenecarbazole, ethoxylated trimethylolpropane triacrylate and bisphenol A-dimethacrylate, the performance indicators of the blue-sensitive photopolymer film, such as diffraction efficiency, exposure sensitivity, refractive index modulation, exposure energy and storage time, are significantly optimized.

[0078] The above embodiments are only used to explain the technical solutions of this application and are not intended to limit it. Although the above embodiments have provided specific descriptions of this application, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation methods of this application. Any modifications and equivalent substitutions that do not depart from the spirit and scope of this application should be covered within the protection scope of this application.

Claims

1. A blue-sensitive photopolymer film, characterized in that, The preparation materials, by weight, include the following: 40-45 parts of monomer, 20-25 parts of polyester polyol, 14-16 parts of aliphatic isocyanate, 1-2 parts of blue light photosensitizer, 2-4 parts of photoinitiator, 5-10 parts of crosslinking agent, 5-10 parts of antioxidant inhibitor, 0.4-0.6 parts of catalyst, 0.5-0.6 parts of defoamer, and 5-9 parts of solvent; The writing monomer includes at least N-ethylenecarbazole and bisphenol A-dimethacrylate, and the mass ratio of N-ethylenecarbazole to bisphenol A-dimethacrylate is 0.08-0.22:1; The antioxidant inhibitor is diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate; The crosslinking agent is N-vinylpyrrolidone; The blue light photosensitizer is acridine orange; The molecular weight of the polyester polyol is 400-3000; The aliphatic isocyanate is Wanhua HT-100; The catalyst is an organic bismuth catalyst, DY-20. The defoamer is BYK-058.

2. The blue-sensitive photopolymer film according to claim 1, characterized in that, The writing monomer is composed of N-ethylenecarbazole, ethoxylated bisphenol fluorene diacrylate, and bisphenol A-dimethacrylate in a mass ratio of 0.1:1:

1.

3. The blue-sensitive photopolymer film according to claim 1, characterized in that, The writing monomer is composed of N-ethylenecarbazole, ethoxylated trimethylolpropane triacrylate, and bisphenol A-dimethacrylate in a mass ratio of 0.2:0.5:

1.

4. The blue-sensitive photopolymer film according to claim 1, characterized in that, The photoinitiator is one or more of triethanolamine, N-phenyldiethanolamine, and diethanolamine.

5. The blue-sensitive photopolymer film according to claim 1, characterized in that, The solvent is one or more of N-methylpyrrolidone, N,N-dimethylformamide, and toluene.

6. A method for preparing a blue-sensitive photopolymer thin film as described in any one of claims 1-5, characterized in that, Includes the following steps: In a darkroom, the solvent was first added to a flask according to the mass ratio. Then, polyester polyol, blue light photosensitizer, photoinitiator, crosslinking agent, writing monomer, antioxidant inhibitor, and defoamer were added. The temperature was heated to 80-90℃ and stirred for 24 hours. Then, aliphatic isocyanate was added and stirred for 30 minutes. Then, the catalyst was added dropwise and stirred for 1 minute to obtain a gel-like solution. The gel-like solution was then coated onto a glass substrate or PET film. After gelation, the film was defoamed under vacuum to obtain the blue-sensitive photopolymer film.

7. An application of a blue-sensitive photopolymer film as described in any one of claims 1-5 in AR-HUD, optical holographic storage, high-end anti-counterfeiting, AR-near-eye display, and holographic sensing.

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