Photocuring body holographic polymer material, grating and preparation method thereof

Abstract

The embodiment of the invention provides a photocuring body holographic polymer material, a grating and a preparation method of the photocuring body holographic polymer material, and the photocuring body holographic polymer material comprises the following components in percentage by mass: 20-45% of liquid crystal; 0.01 to 2% of a photoinitiator; 0.5%-5% of a co-initiator; 5%-40% of a first monomer; 10%-50% of a second monomer; 1%-10% of a third monomer; the second monomer and / or the third monomer contains ethyoxyl; the first monomer is selected from one or more of hexafluorobutyl methacrylate, 2, 2, 2-trifluoroethyl acrylate, 2-(trifluoromethyl) acrylic acid, 2, 2, 2-trifluoroethyl acrylate, 2-(trifluoromethyl) acrylic acid and hexafluorobutyl acrylate; and the second monomer is selected from one or more of hexafluorobutyl methacrylate, 2, 2, 2-trifluoroethyl acrylate, 2-(trifluoromethyl) acrylic acid and hexafluorobutyl acrylate. According to the technical scheme provided by the embodiment of the invention, the fluorine-containing first monomer is selected, so that the surface tension of the material can be reduced, and the photocuring holographic polymer material can form a microstructure with a regular structure.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of grating waveguide lens materials, and in particular to a photocurable holographic polymer material, a grating and a preparation method thereof. Background Art

[0002] Augmented Reality (AR), also known as augmented reality, can integrate real-world information with virtual-world information. The AR industry has developed rapidly in recent years and is increasingly used in various industries, such as education, training, medical treatment, design, advertising, etc. The core of AR optical display is optical waveguide, which can be realized by diffraction grating. Volume holographic grating is a diffraction grating used for diffraction optical waveguide.

[0003] AR glasses waveguide lens is a lens containing a grating structure, in which the grating structure will affect the final imaging effect of the waveguide lens. Since the picture observed by the human eye from the waveguide lens is an image of a region, and the conventional diffraction efficiency test method can only test the diffraction efficiency of a single point, it is impossible to judge the state of the overall grating. The current volume holographic grating microstructure is likely to have many holes, resulting in irregular microstructure. During the imaging process, the irregularity of the grating microstructure will affect the imaging in a specific corresponding area. Summary of the invention

[0004] The embodiment of the present invention provides a photocurable volume holographic polymer material, a grating and a preparation method thereof, wherein the microscopic morphology of the volume holographic grating is improved by selecting a fluorine-containing first monomer.

[0005] In a first aspect, an embodiment of the present invention provides a photocurable holographic polymer material, which comprises, by mass percentage:

[0006] LCD 20%-45%;

[0007] Photoinitiator 0.01-2%;

[0008] Co-initiator 0.5%-5%;

[0009] The first monomer is 5%-40%;

[0010] The second monomer 10%-50%;

[0011] The third monomer 1%-10%;

[0012] The first monomer is selected from one or more of hexafluorobutyl methacrylate, 2,2,2,-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, 2,2,2,-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, and hexafluorobutyl acrylate.

[0013] Optionally, the second monomer and / or the third monomer contains an ethoxy group.

[0014] Optionally, the second monomer is selected from one or more of cyclohexanedimethanol diacrylate, polyethylene glycol diacrylate (n=13), polyethylene glycol diacrylate (n=9), polyethylene glycol diacrylate (n=5), tripropylene glycol diacrylate, ethylene glycol dimethacrylate, 4 (ethoxy) bisphenol A dimethacrylate, neopentyl glycol diacrylate, and 1,3-butanediol dimethacrylate.

[0015] Optionally, the third monomer is selected from one or more of ethoxylated trimethylolpropane triacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate.

[0016] Optionally, the liquid crystal is selected from one or more of RDP-A4899, RDP-A4901, BL087, MLC6882, TL213 and P0616A.

[0017] Optionally, the photoinitiator is selected from one or more of Lucirin TPO, camphorquinone, Irgacure 784, thioacridone, rhodamine B, eosin, rose Bengal and QLCURE-BCIM.

[0018] Optionally, the co-initiator is selected from one or more of N-phenylglycine, N,N-dimethylhexanamide and benzoyl peroxide.

[0019] In a second aspect, an embodiment of the present invention further provides a method for preparing a volume holographic grating device, comprising:

[0020] The photocurable holographic polymer material described in any one of the first aspects of the present invention is filled into a liquid crystal box; the liquid crystal box is placed in the interference light field of a double-beam light source for interference exposure.

[0021] Optionally, the angle between the dual-beam light sources is 35°-60°.

[0022] Optionally, the interference exposure time under the interference light field of the double-beam light source is 1-10 minutes, and the irradiation power is 5mW / cm 2 .

[0023] In a third aspect, an embodiment of the present invention further provides a volume holographic grating device, which is prepared by the preparation method described in any one of the second aspects of the present invention.

[0024] The embodiment of the present invention provides a photocurable holographic polymer material, a grating and a preparation method thereof. The photocurable holographic polymer material includes, by mass percentage: 20%-45% of liquid crystal; 0.01%-2% of photoinitiator; 0.5%-5% of coinitiator; 5%-40% of first monomer; 10%-50% of second monomer; 1%-10% of third monomer; the first monomer is selected from one or more of hexafluorobutyl methacrylate, 2,2,2,-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, 2,2,2,-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, and hexafluorobutyl acrylate. The technical solution of the embodiment of the present invention can reduce the surface tension of the material by selecting the fluorine-containing first monomer, so that the photocurable holographic polymer material can form a microstructure with a regular structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a microscopic topography image of a grating provided in the first embodiment of the present invention;

[0026] Figure 2-Figure 4 This is a microscopic topography of a grating provided in the second embodiment of the present invention;

[0027] Figure 5-Figure 6 This is a microscopic topography of a grating provided in the third embodiment of the present invention;

[0028] Figure 7-Figure 8 This is a microscopic topography image of a grating provided by the fourth embodiment of the present invention;

[0029] Figure 9-11 This is a microscopic topography of a grating provided in Embodiment 5 of the present invention;

[0030] Fig.12 This is a microscopic topography of a grating provided in Example 1;

[0031] Figure 13-Figure 14 This is a microscopic topography of a grating provided in Example 2;

[0032] Figure 15-16 This is a microscopic morphology image of the volume holographic grating provided in Example 3. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] It should be mentioned before discussing exemplary embodiments in more detail that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe various operations (or steps) as sequential processes, many operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of various operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to methods, functions, procedures, subroutines, subprograms, etc. In addition, the embodiments in the present invention and the features in the embodiments can be combined with each other without conflict.

[0035] The term “including” and its variations used in the present invention are open inclusions, that is, “including but not limited to.” The term “based on” means “based at least in part on.” The term “one embodiment” means “at least one embodiment.”

[0036] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish the corresponding contents, and are not used to limit the order or interdependence.

[0037] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0038] A photocurable holographic polymer material comprises, by mass percentage: 20%-45% of liquid crystal; 0.01%-2% of photoinitiator; 0.5%-5% of coinitiator; 5%-40% of first monomer; 10%-50% of second monomer; 1%-10% of third monomer;

[0039] The second monomer and / or the third monomer contains an ethoxy group; the first monomer is selected from one or more of hexafluorobutyl methacrylate, 2,2,2-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, 2,2,2-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, and hexafluorobutyl acrylate.

[0040] Specifically, in the above-mentioned photocurable holographic polymer material, the photoinitiator and the co-initiator can initiate the first monomer, the second monomer and the third monomer to undergo a chain free radical / ion polymerization reaction; the first monomer, as a diluent, has a low viscosity and can play a role in growing the molecular chain of the polymer; the second monomer and the third monomer can rapidly cross-link the oligomer to form a fixed structure. By adjusting the ratio of the first, second and third monomers, the viscosity of the material can be adjusted to make it suitable for processing. However, in the process of forming the polymer, due to the existence of the surface tension of the material, the migration process of the liquid crystal in the process of forming the grating is hindered, and the liquid crystal is combined into a piece to form a bumpy phase separation structure, thereby making the microstructure of the photocurable holographic polymer material irregular. Therefore, the first monomer is a fluorine-containing monomer. The fluorine-containing monomer can reduce the surface tension of the material, making the liquid crystal migration easier, which is conducive to the formation of a regular phase separation structure.

[0041] The embodiment of the present invention provides a photocurable holographic polymer material, which includes, by mass percentage: 20%-45% liquid crystal; 0.01%-2% photoinitiator; 0.5%-5% coinitiator; 5%-40% first monomer; 10%-50% second monomer; 1%-10% third monomer; the second monomer and / or the third monomer contains ethoxy; the first monomer is selected from one or more of hexafluorobutyl methacrylate, 2,2,2,-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, 2,2,2,-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, and hexafluorobutyl acrylate. The technical solution of the embodiment of the present invention can reduce the surface tension of the material by selecting the fluorine-containing first monomer, so that the photocurable holographic polymer material can form a microstructure with a regular structure.

[0042] In an optional embodiment of the present invention, the second monomer and / or the third monomer contains an ethoxy group. Exemplarily, the second monomer is selected from one or more of cyclohexanedimethanol diacrylate, polyethylene glycol diacrylate (n=13), polyethylene glycol diacrylate (n=9), polyethylene glycol diacrylate (n=5), tripropylene glycol diacrylate, ethylene glycol dimethacrylate, 4 (ethoxy) bisphenol A dimethacrylate, neopentyl glycol diacrylate, and 1,3-butylene glycol dimethacrylate.

[0043] The third monomer is selected from one or more of ethoxylated trimethylolpropane triacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate.

[0044] The liquid crystal is selected from one or more of RDP-A4899, RDP-A4901, BL087, MLC6882, TL213 and P0616A.

[0045] The photoinitiator is selected from one or more of Lucirin TPO, camphorquinone, Irgacure 784, thioacridone, rhodamine B, eosin, rose bengal and QLCURE-BCIM.

[0046] The co-initiator is selected from one or more of N-phenylglycine, N,N-dimethylhexanamide and benzoyl peroxide.

[0047] Specifically, in the holographic photopolymer material of the embodiment of the present invention, each component material is selected from one or more of the above-mentioned materials in terms of mass percentage, and acrylic monomers with different functionalities are added, wherein the viscosity of the first monomer, the second monomer and the third monomer are different. By adjusting the ratio, the system viscosity of the material is very suitable for processing. During the processing, the monomers are easy to move, and the double bond structure on each monomer molecule can be easily involved in the reaction, thereby improving the conversion rate of the double bonds. The increase in the conversion rate of the double bonds will increase the refractive index of the material itself, thereby improving the refractive index modulation of the material and improving the diffraction efficiency; at the same time, due to the existence of the surface tension of the material, the migration process of the liquid crystal in the process of forming the grating is hindered, and the liquid crystal is combined into a piece to form a phase separation structure with pits and pits, thereby making the microstructure of the photocured holographic polymer material irregular, so the first monomer is a fluorine-containing monomer, which can reduce the surface tension of the material, making the liquid crystal migrate more easily, thereby facilitating the formation of a regular phase separation structure; at the same time, the monomer containing ethoxy is selected, and the compatibility of the liquid crystal with the polymer and the monomer can be increased without the need for a solvent, thereby reducing the haze.

[0048] Based on the same concept, an embodiment of the present invention further provides a volume holographic grating device and a method for preparing the same. The volume holographic grating device includes any one of the photocurable volume holographic polymer materials provided in the embodiments of the present invention. Moreover, since the volume holographic grating device includes the photocurable volume holographic polymer material provided in the embodiments of the present invention, it has the same or similar beneficial effects as the photocurable volume holographic polymer material provided in the embodiments of the present invention.

[0049] The following is further described in conjunction with specific examples and comparative examples. The raw materials involved in the following specific examples, unless otherwise specified, can all be sourced from commercial sources, and the instruments used, unless otherwise specified, can all be sourced from commercial sources.

[0050] Embodiment 1

[0051] The photocurable holographic polymer material of the embodiment of the present invention is composed of the following raw material components in parts by weight: 36.5% of TL213; 1.3% of rhodamine B; 3% of N-phenylglycine; 12% of hexafluorobutyl methacrylate; 6% of 1,3-butanediol dimethacrylate; 34% of tripropylene glycol diacrylate; and 7.2% of pentaerythritol triacrylate.

[0052] Weigh the raw materials of each component according to the above mass ratio, put them into ultrasonic dispersing equipment, and disperse them evenly at 60°C for 30 minutes. Then pour the evenly dispersed photocurable holographic material into the liquid crystal box, and control the thickness of the liquid crystal box to be 10μm.

[0053] Then, the microscope was placed under the interference light field of a double-beam light source with an angle of 45° and the interference exposure was 5 min with an irradiation power of 5 mW / cm 2 , a volume holographic grating device was obtained. The microscopic morphology of the grating was observed using a scanning electron microscope (SEM). Figure 1 is a microscopic morphology of a grating provided in the first embodiment of the present invention, with reference to Figure 1 The gratings made of fluorine-containing monomers are uniform and regular, and there are no obvious defects in the microstructure.

[0054] Embodiment 2

[0055] The photocurable holographic polymer material of the embodiment of the present invention is composed of the following raw material components in parts by weight: 38% of P0616A; 0.5% of rhodamine B; 2% of N,N-dimethylhexanamide; 20% of 2-(trifluoromethyl)acrylic acid; 3% of polyethylene glycol diacrylate (n=5); 33% of 4(ethoxy)bisphenol A dimethacrylate; and 3.5% of dipentaerythritol hexaacrylate.

[0056] Weigh the raw materials of each component according to the above mass ratio, put them into ultrasonic dispersing equipment, and disperse them evenly at 60°C for 30 minutes. Then pour the evenly dispersed photocurable holographic material into the liquid crystal box, and control the thickness of the liquid crystal box to be 10μm.

[0057] Then, the microscope was placed under the interference light field of a double-beam light source with an angle of 45° and the interference exposure was 5 min with an irradiation power of 5 mW / cm 2 , a volume holographic grating device was obtained. The microscopic morphology of the grating was observed using SEM. Figure 2-Figure 4 is a microscopic morphology diagram of a grating provided in the second embodiment of the present invention, referring to Figure 2-Figure 4 The gratings made of fluorine-containing monomers are uniform and regular, and there are no obvious defects in the microstructure.

[0058] Embodiment 3

[0059] The photocurable holographic polymer material of the embodiment of the present invention is composed of the following raw material components in parts by weight: 37.7% BL087; 0.9% Bengal rose red; 2.3% N, N-dimethylhexanamide; 16% 2,2,2-trifluoroethyl acrylate; 5% 4-(ethoxy)bisphenol A dimethacrylate; 34% tripropylene glycol diacrylate; and 4.1% trimethylolpropane triacrylate.

[0060] Weigh the raw materials of each component according to the above mass ratio, put them into ultrasonic dispersing equipment, and disperse them evenly at 60°C for 30 minutes. Then pour the evenly dispersed photocurable holographic material into the liquid crystal box, and control the thickness of the liquid crystal box to be 10μm.

[0061] Then, the microscope was placed under the interference light field of a double-beam light source with an angle of 45° and the interference exposure was 5 min with an irradiation power of 5 mW / cm 2 , and a volume holographic grating device is obtained.

[0062] The microstructure of the grating was observed using SEM. Figure 5-Figure 6 is a microscopic morphology image of a grating provided in the third embodiment of the present invention, referring to Figure 5 , Figure 6 The gratings made of fluorine-containing monomers are uniform and regular, and there are no obvious defects in the microstructure.

[0063] Embodiment 4

[0064] The photocurable holographic polymer material of the embodiment of the present invention is composed of the following raw material components in parts by weight: 36.2% of RDP-A4901; 1.2% of rhodamine B; 4% of benzoyl peroxide; 21% of 2,2,2-trifluoroethyl acrylate; 2% of tripropylene glycol diacrylate; 28% of neopentyl glycol diacrylate; and 7.6% of trimethylolpropane triacrylate.

[0065] Weigh the raw materials of each component according to the above mass ratio, put them into ultrasonic dispersing equipment, and disperse them evenly at 60°C for 30 minutes. Then pour the evenly dispersed photocurable holographic material into the liquid crystal box, and control the thickness of the liquid crystal box to be 10μm.

[0066] Then, the microscope was placed under the interference light field of a double-beam light source with an angle of 45° and the interference exposure was 5 min with an irradiation power of 5 mW / cm 2 , and a volume holographic grating device is obtained.

[0067] The microstructure of the grating was observed using SEM. Figure 7-Figure 8 is a microscopic morphology image of a grating provided by the fourth embodiment of the present invention, referring to Figure 7-Figure 8 The gratings made of fluorine-containing monomers are uniform and regular, and there are no obvious defects in the microstructure.

[0068] Embodiment 5

[0069] The photocurable holographic polymer material of the embodiment of the present invention is composed of the following raw material components in parts by weight: 39.1% of RDP-A4901; 1.5% of Bengal rose red; 4.3% of N-phenylglycine; 16% of 2-(trifluoromethyl)acrylic acid; 6% of cyclohexanedimethanol diacrylate; 31% of ethylene glycol dimethacrylate; and 2.1% of ethylene glycol dimethacrylate.

[0070] Weigh the raw materials of each component according to the above mass ratio, put them into ultrasonic dispersing equipment, and disperse them evenly at 60°C for 30 minutes. Then pour the evenly dispersed photocurable holographic material into the liquid crystal box, and control the thickness of the liquid crystal box to be 10μm.

[0071] Then, the microscope was placed under the interference light field of a double-beam light source with an angle of 45° and the interference exposure was 5 min with an irradiation power of 5 mW / cm 2 , and a volume holographic grating device is obtained.

[0072] The microstructure of the grating was observed using SEM. Figure 9-11 is a microscopic morphology of a grating provided in the fifth embodiment of the present invention, with reference to Figure 9-11 The gratings made of fluorine-containing monomers are uniform and regular, and there are no obvious defects in the microstructure.

[0073] Comparative Example 1

[0074] The photocurable holographic polymer material of this comparative example is composed of the following raw material components in parts by weight: 38% of TL213; 1.5% of rhodamine B; 2.6% of N-phenylglycine; 15% of ethyl methacrylate; 5% of 1,3-butanediol dimethacrylate; 33% of neopentyl glycol diacrylate; and 4.9% of trimethylolpropane triacrylate.

[0075] Weigh the raw materials of each component according to the above mass ratio, put them into ultrasonic dispersing equipment, and disperse them evenly at 60°C for 30 minutes. Then pour the evenly dispersed photocurable holographic material into the liquid crystal box, and control the thickness of the liquid crystal box to be 10μm.

[0076] Then, the microscope was placed under the interference light field of a double-beam light source with an angle of 45° and the interference exposure was 5 min with an irradiation power of 5 mW / cm 2 , and a volume holographic grating device is obtained.

[0077] The microstructure of the grating was observed using SEM. Fig.12 is a microscopic morphology of a grating provided in comparative example 1 of the present invention, referring to Fig.12 , the grating made of non-fluorinated monomer has many holes and irregular microstructure.

[0078] Comparative Example 2

[0079] The photocurable holographic polymer material of this comparative example is composed of the following raw material components in parts by weight: 35% of RDP-A4901; 1.1% of Bengal rose red; 2.2% of N,N-dimethylhexanamide; 13% of isobornyl acrylate; 8% of hydroxyethyl acrylate; 34% of neopentyl glycol diacrylate; and 6.7% of pentaerythritol triacrylate.

[0080] Weigh the raw materials of each component according to the above mass ratio, put them into ultrasonic dispersing equipment, and disperse them evenly at 60°C for 30 minutes. Then pour the evenly dispersed photocurable holographic material into the liquid crystal box, and control the thickness of the liquid crystal box to be 10μm.

[0081] Then, the microscope was placed under the interference light field of a double-beam light source with an angle of 45° and the interference exposure was 5 min with an irradiation power of 5 mW / cm 2 , and a volume holographic grating device is obtained.

[0082] The microstructure of the grating was observed using SEM. Figure 13-Figure 14 This is a microscopic morphology of a grating provided in comparative example 2 of the present invention, referring to Figure 13-Figure 14 , the grating made of non-fluorinated monomer has many holes and irregular microstructure.

[0083] Comparative Example 3

[0084] The photocurable volume holographic material of this comparative example is composed of the following raw material components in parts by weight: 39% of RDP-A4901; 0.4% of Bengal rose red; 1.2% of pentaerythritol triacrylate; 15% of 2-phenoxyethyl methacrylate; 6% of 1,3-butanediol dimethacrylate; 35% of tripropylene glycol diacrylate; and 3.4% of dipentaerythritol pentaacrylate.

[0085] Weigh the raw materials of each component according to the above mass ratio, put them into ultrasonic dispersing equipment, and disperse them evenly at 60°C for 30 minutes. Then pour the evenly dispersed photocurable holographic material into the liquid crystal box, and control the thickness of the liquid crystal box to be 10μm.

[0086] Then, the microscope was placed under the interference light field of a double-beam light source with an angle of 45° and the interference exposure was 5 min with an irradiation power of 5 mW / cm 2 , and a volume holographic grating device is obtained.

[0087] Use SEM to observe the microscopic morphology of the grating. Specifically, Figure 15-16 is a microscopic morphology of the volume holographic grating provided in Comparative Example 3 of the present invention, referring to Fig.15 , Fig.16 The gratings made from the monomers without fluorine have many holes and irregular microstructure.

[0088] Specifically, by comparing the above embodiments and the comparative examples, it can be found that the regularity of the microstructure of the volume holographic grating device prepared in embodiments 1-5 is significantly higher than that of comparative examples 1-3, that is, under the same other conditions, the volume holographic grating device is prepared by selecting a fluorine-containing first monomer. The fluorine-containing monomer can reduce the surface tension of the material, making it easier for liquid crystal to migrate, thereby facilitating the formation of a regular phase separation structure, so that during the imaging process of the grating, the regular grating microstructure will not affect the imaging in a specific corresponding area.

[0089] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A photocurable holographic polymer material, characterized in that: In terms of mass percentage, it includes: LCD 20%-45%; Photoinitiator 0.01-2%; Co-initiator 0.5%-5%; The first monomer is 5%-40%; The second monomer 10%-50%; The third monomer 1%-10%; The first monomer is selected from one or more of hexafluorobutyl methacrylate, 2,2,2,-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, 2,2,2,-trifluoroethyl acrylate, 2-(trifluoromethyl)acrylic acid, and hexafluorobutyl acrylate.

2. The volume holographic polymer material according to claim 1, characterized in that: The second monomer and / or the third monomer contains an ethoxy group.

3. The volume holographic polymer material according to claim 2, characterized in that: The second monomer is selected from one or more of cyclohexanedimethanol diacrylate, polyethylene glycol diacrylate (n=13), polyethylene glycol diacrylate (n=9), polyethylene glycol diacrylate (n=5), tripropylene glycol diacrylate, ethylene glycol dimethacrylate, 4 (ethoxy) bisphenol A dimethacrylate, neopentyl glycol diacrylate, and 1,3-butanediol dimethacrylate.

4. The volume holographic polymer material according to claim 2, characterized in that: The third monomer is selected from one or more of ethoxylated trimethylolpropane triacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate.

5. The volume holographic polymer material according to claim 1, characterized in that: The liquid crystal is selected from one or more of RDP-A4899, RDP-A4901, BL087, MLC6882, TL213 and P0616A.

6. The volume holographic polymer material according to claim 1, characterized in that: The photoinitiator is selected from one or more of Lucirin TPO, camphorquinone, Irgacure 784, thioacridone, rhodamine B, eosin, rose Bengal and QLCURE-BCIM.

7. The volume holographic polymer material according to claim 1, characterized in that: The co-initiator is selected from one or more of N-phenylglycine, N,N-dimethylhexanamide and benzoyl peroxide.

8. A method for preparing a volume holographic grating device, characterized in that: include: Filling the photocurable holographic polymer material according to any one of claims 1 to 7 into a liquid crystal cell; The liquid crystal box is placed under the interference light field of a double-beam light source for interference exposure.

9. The method for preparing a volume holographic grating device according to claim 7, characterized in that: The angle between the double-beam light sources is 35°-60°.

10. The method for preparing a volume holographic grating device according to claim 7, characterized in that: The interference exposure time under the interference light field of the double-beam light source is 1-10 minutes, and the irradiation power is 1-20mW / cm 2 .

11. A volume holographic grating device, characterized in that: Prepared by the preparation method according to any one of claims 8 to 10.

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