Solid optical material, preparation method and application thereof

Abstract

The present invention discloses a solid optical material, a preparation method and application thereof, wherein the solid optical material comprises the following raw materials: salicylaldehyde 4-chloroaniline, methyl methacrylate and an initiator, wherein the solid-liquid ratio of the salicylaldehyde 4-chloroaniline and the methyl methacrylate satisfies: 0.5mg-1.5mg: 10ml-30ml; the solid-liquid ratio of the initiator and the methyl methacrylate satisfies: 1mg-3mg: 0.5ml-1.5ml. The solid optical material according to the present invention is a colorless and transparent organic glass solidified material with high light transmittance. On the one hand, the solid optical material is convenient to use, store and transport, and on the other hand, the solid optical material has higher safety and better stability. Furthermore, the solid optical material according to the present invention also opens up new ideas for the application of photochromic materials.

Description

Technical Field

[0001] The present invention relates to the field of optical materials, and in particular to a solid optical material, a preparation method and application thereof. Background Art

[0002] With the advancement of science and technology and the development of the times, traditional two-dimensional image display can no longer meet people's needs. Therefore, three-dimensional display technology is developing rapidly. Three-dimensional display expresses more information, has a wider viewing angle, and is more three-dimensional. At the same time, there are various types of three-dimensional display technologies, such as stereoscopic display, holographic display, and volumetric three-dimensional display. Among them, volumetric three-dimensional display displays three-dimensional objects through volume pixels in three-dimensional space. It is a real three-dimensional image that can provide all depth information. Schiff base mainly refers to a class of organic compounds containing imine or azomethine characteristic groups (-RC=N-). Usually, Schiff base is formed by condensation of amine and active carbonyl. Some Schiff bases contain characteristic groups (such as chiral aldehydes) and have great application potential in the field of photochromism. Photochromic materials, also known as optical switch materials, have great potential in the field of three-dimensional display. However, there are currently few reports on the use of Schiff bases for volumetric three-dimensional display. The main reason is that Schiff bases are opaque in powder state and cannot be displayed in space. When Schiff bases are in solution, the photochromic phenomenon is not obvious and is not easy to observe and identify. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a solid optical material, a writable and erasable material for spatial static three-dimensional imaging, and the image is clear and does not diffuse.

[0004] Another object of the present invention is to provide a method for preparing a solid optical material.

[0005] Another object of the present invention is to provide an application of solid optical material.

[0006] The solid optical material according to the first aspect of the present invention comprises the following raw materials: salicylaldehyde 4-chloroaniline, methyl methacrylate and an initiator, wherein the solid-liquid ratio of the salicylaldehyde 4-chloroaniline and the methyl methacrylate satisfies: 0.5mg~1.5mg:10ml~30ml; the solid-liquid ratio of the initiator and the methyl methacrylate satisfies: 1mg~3mg:0.5ml~1.5ml.

[0007] The solid optical material according to the specific embodiment of the present invention is a colorless and transparent organic glass solidified material with high light transmittance. On the one hand, the solid optical material is convenient to use, store and transport, and on the other hand, the solid optical material has higher safety and better stability. Furthermore, the solid optical material according to the specific embodiment of the present invention also opens up new ideas for the application of photochromic materials.

[0008] According to some embodiments of the present invention, the solid-liquid ratio of the salicylaldehyde 4-chloroaniline and the methyl methacrylate satisfies: 1.0 mg: 20 ml; the solid-liquid ratio of the initiator and the methyl methacrylate satisfies: 2 mg: 1 ml.

[0009] According to some embodiments of the present invention, the initiator includes at least one of an azo compound initiator and a peroxide initiator; preferably, the initiator includes at least one of azobisisobutyronitrile, azobisisoheptylnitrile, dimethyl azobisisobutyrate, benzamide peroxide, lauroyl peroxide, isopropylbenzene hydroperoxide and methyl ethyl ketone peroxide; more preferably, the initiator is azobisisobutyronitrile.

[0010] According to some embodiments of the present invention, the concentration of salicylaldehyde 4-chloroaniline in the solid optical material is m, wherein m satisfies: 0.01 mg / ml≤m≤0.1 mg / ml; preferably, m=0.05 mg / ml.

[0011] According to an embodiment of the second aspect of the present invention, the present invention provides a method for preparing a solid optical material according to an embodiment of the first aspect, comprising the following steps: reacting salicylaldehyde with 4-chloroaniline in the material ratio with an initiator and methyl methacrylate, mixing the mixture for reaction, and curing by heating to obtain a colorless and transparent solid.

[0012] According to some embodiments of the present invention, the preparation method comprises the following steps: step 1, dispersing the salicylaldehyde condensate 4-chloroaniline in the material ratio into methyl methacrylate, adding an initiator, stirring, and fully dissolving it to obtain a solution; step 2, heating the solution in step 1 to 50-100°C, and stirring it to fully react until the reaction liquid becomes viscous; step 3, pouring the viscous reaction liquid in step 2 into a mold, initially curing it at 45-60°C for 20-30h, and after the initial curing, heating it to 80-120°C and curing it again for 0.5-1.5h to complete the curing; step 4, cutting, grinding, and splicing the cured material in step 3 to obtain a colorless and transparent solid.

[0013] According to an embodiment of the third aspect of the present invention, the present invention provides an application of the solid optical material according to the embodiment of the first aspect, or an optical material prepared by the preparation method according to the preparation method described in the embodiment of the second aspect in static three-dimensional imaging in space.

[0014] According to some embodiments of the present invention, the following steps are included: irradiating the solid optical material with ultraviolet light to change the structure of salicylaldehyde 4-chloroaniline to obtain a brown-yellow solid optical material; irradiating the solid optical material with green light; in the solid optical material, the intersection of the ultraviolet light and the green light is excited to emit red fluorescence, forming a red spatial three-dimensional image, that is, realizing spatial static three-dimensional imaging.

[0015] According to some embodiments of the present invention, the following steps are included: S1: irradiating the solid optical material with ultraviolet light to change the structure of salicylaldehyde 4-chloroaniline to obtain a brown-yellow solid optical material; S2: irradiating the brown-yellow solid optical material of step S1 with green light, wherein the intersection of the ultraviolet light and the green light in the solid optical material is excited to emit red fluorescence, forming a red spatial three-dimensional image, i.e., realizing spatial static three-dimensional imaging; preferably, the brown-yellow solid optical material in step S1 is a base plate for spatial static three-dimensional imaging, and the direction of green light irradiation in step S2 is perpendicular to the plane of the base plate.

[0016] According to some embodiments of the present invention, the following steps are included: S1: irradiating the solid optical material with green light; S2: irradiating the solid optical material described in step S1 with ultraviolet light, wherein the intersection of the ultraviolet light and the green light in the solid optical material is excited to emit red fluorescence, thereby forming a red spatial three-dimensional image, i.e., realizing spatial static three-dimensional imaging; preferably, the optical path of the green light in the solid optical material after the green light irradiation in step S1 is used as the base plate of the spatial static three-dimensional imaging, and the direction of the ultraviolet light irradiation in step S2 is perpendicular to the plane where the base plate is located.

[0017] According to some embodiments of the present invention, the wavelength of the ultraviolet light is λ1, wherein λ1 satisfies: 365nm≤λ1≤395nm; and / or the wavelength of the green light is λ2, wherein λ2 satisfies: 488nm≤λ2≤532nm; and / or the power of the ultraviolet light source is W1, wherein W1 satisfies: 60mW≤W1≤300mW; and / or the power of the green light source is W2, wherein W2 satisfies: 20mW≤W2≤100mW.

[0018] According to some embodiments of the present invention, at room temperature and when the natural light intensity is 300 Lux to 500 Lux, the illumination is stopped and the spatial static three-dimensional image is stored for 1 to 3 seconds.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a photochromic reaction of salicylaldehyde condensing 4-chloroaniline according to a specific embodiment of the present invention, wherein λ1 refers to ultraviolet light, λ2 refers to green light or other visible light, and Δ refers to heating;

[0022] Figure 2 Schematic diagram of the optical path of the solid optical material for realizing volumetric three-dimensional imaging according to a specific embodiment of the present invention; wherein A is a schematic diagram of the actual optical path of the solid optical material for realizing spatial static three-dimensional imaging according to the present invention; and B is a schematic diagram of the principle of the solid optical material for realizing spatial static three-dimensional imaging according to the present invention;

[0023] Figure 3 The present invention is a static three-dimensional spatial image display diagram of a solid optical material according to a specific embodiment of the present invention: wherein a is a colorless solid optical material; b is a solid optical material of the present invention having no fluorescence when directly irradiated with a 532nm green laser; and c is a solid optical material of the present invention irradiated with 365nm ultraviolet light and then excited with a green light source, generating a spatial circular image at the intersection of ultraviolet light and green light. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0025] Reference below Figure 1-Figure 3 The solid optical material according to the first aspect of the present invention is described as follows: salicylaldehyde 4-chloroaniline, methyl methacrylate and an initiator. Here, salicylaldehyde 4-chloroaniline is a photochromic material, and the initiator induces the polymerization reaction of methyl methacrylate to obtain an organic glass cured product. The organic glass cured product is suitable as a carrier for optical imaging. The salicylaldehyde 4-chloroaniline is dispersed in the organic glass cured product to form the solid optical material of the invention.

[0026] The solid-liquid ratio of salicylaldehyde 4-chloroaniline and methyl methacrylate satisfies: 0.5mg-1.5mg: 10ml-30ml. In this way, the content of salicylaldehyde 4-chloroaniline in the solid optical material is appropriate, so that the solid optical material can have clear imaging, high light transmittance, and good imaging effect.

[0027] The solid-liquid ratio of the initiator to methyl methacrylate satisfies: 1mg-3mg: 0.5ml-1.5ml. With such a configuration, the amount of the initiator added is appropriate, which is conducive to the initiator fully inducing the polymerization of methyl methacrylate to obtain a uniform polymer. It can also effectively avoid the influence of the initiator on the condensation of salicylaldehyde to 4-chloroaniline, which is conducive to the solidification of methyl methacrylate to obtain a colorless and transparent solid optical material.

[0028] The solid optical material according to the specific embodiment of the present invention is a colorless and transparent organic glass solidified material with high light transmittance. On the one hand, the solid optical material is convenient to use, store and transport, and on the other hand, the solid optical material has higher safety and better stability. Furthermore, the solid optical material according to the specific embodiment of the present invention also opens up new ideas for the application of photochromic materials.

[0029] According to some embodiments of the present invention, the solid-liquid ratio of salicylaldehyde 4-chloroaniline and methyl methacrylate satisfies: 1.0 mg: 20 ml. In this way, the content of salicylaldehyde 4-chloroaniline in the solid optical material is more suitable, and the solid optical material has a clearer image, a higher light transmittance, and a better imaging effect.

[0030] According to some embodiments of the present invention, the solid-liquid ratio of the initiator to methyl methacrylate satisfies: 2 mg: 1 ml. The addition amount of the initiator is appropriate, which is more conducive to the initiator fully inducing the polymerization of methyl methacrylate to obtain a uniform cured product.

[0031] According to some embodiments of the present invention, the initiator includes at least one of an azo compound initiator and a peroxide initiator. In this way, the initiator is colorless and transparent, and does not interfere with the proton migration and imaging of the solid optical material of the present invention under ultraviolet light irradiation, and can effectively induce the polycondensation reaction of methyl methacrylate to obtain a cured organic glass product.

[0032] According to some embodiments of the present invention, the initiator includes at least one of azobisisobutyronitrile, azobisisoheptanenitrile, dimethyl azobisisobutyrate, benzamide peroxide, lauroyl peroxide, cumene hydroperoxide and methyl ethyl ketone peroxide. In this way, the selection of the initiator is diverse.

[0033] According to some embodiments of the present invention, the initiator is azobisisobutyronitrile. In this way, the initiator can induce the polymerization reaction of methyl methacrylate to form a solid optical material, and can also reduce the influence of the initiator on salicylaldehyde aniline as much as possible, so that the transmittance of the obtained solid optical material is higher.

[0034] According to some embodiments of the present invention, the concentration of salicylaldehyde 4-chloroaniline in the solid optical material is m, wherein m satisfies: 0.01 mg / ml≤m≤0.1 mg / ml. In this arrangement, if m is less than 0.01 mg / ml, the concentration of salicylaldehyde 4-chloroaniline in the solid optical material is small, and the color change phenomenon of the solid optical material is not obvious, which is not conducive to imaging and observation. If m is greater than 0.1 mg / ml, the concentration of salicylaldehyde 4-chloroaniline in the solid optical material is large, which will affect the penetration depth of the light source in the solid optical material, and when the concentration of salicylaldehyde 4-chloroaniline in the solid optical material is too large, the solid optical material is easily stained with the yellow color of salicylaldehyde 4-chloroaniline, thereby affecting the imaging of the solid optical material. By setting so that m satisfies 0.01 mg / ml≤m≤0.1 mg / ml, the color change phenomenon of the solid optical material is significant and the imaging performance is good.

[0035] According to an embodiment of the second aspect of the present invention, the present invention provides a method for preparing a solid optical material according to an embodiment of the first aspect of the present invention, comprising the following steps: mixing salicylaldehyde condensed with 4-chloroaniline, an initiator, and methyl methacrylate in the above material ratio, reacting, and heating to cure to obtain a colorless and transparent solid.

[0036] According to the method for preparing a solid optical material of a specific embodiment of the present invention, salicylaldehyde condenses 4-chloroaniline with an initiator and methyl methacrylate, reacts, and heats to cure to obtain a colorless and transparent solid. The preparation method is simple, and the obtained solid optical material has a high application value.

[0037] According to some embodiments of the present invention, the following steps are included: Step 1, dispersing the salicylaldehyde 4-chloroaniline in the above material ratio into methyl methacrylate, adding an initiator, and rapidly stirring to fully dissolve it. Such a configuration is conducive to fully mixing the salicylaldehyde 4-chloroaniline, the initiator, and the methyl methacrylate to form a uniform and stable state, and is conducive to the initiator inducing the polymerization reaction of the methyl methacrylate to form a uniform solid optical material.

[0038] Step 2: Heat the solution of step 1 to 50-100° C. and stir to fully react until the reaction liquid becomes viscous. In this way, at a higher temperature, the initiator can induce the polymerization reaction of methyl methacrylate as soon as possible.

[0039] Step 3: Pour the viscous reaction liquid in step 2 into the mold, perform the initial curing at 45-60°C for 20-30h, and after the initial curing, heat up to 80-120°C and cure again for 0.5-1.5h to complete the curing. In this way, the present invention divides the curing process into two stages: initial curing and secondary curing. The initial curing temperature is low and the time is long. A uniform and stable state is formed by slow curing. The secondary curing temperature is high and the time is short, which is a reinforcement of the initial curing. In this way, it is more conducive to forming a uniform solid optical material with excellent optical properties.

[0040] Step 4: Cut, grind and splice the solidified material in step 3 to obtain a colorless and transparent solid. In this way, the appearance and quality of the obtained solid optical material are better.

[0041] According to some embodiments of the present invention, the primary curing is performed by heating in a water bath, so that the heating conditions are relatively mild.

[0042] According to the method for preparing a solid optical material of a specific embodiment of the present invention, the curing process is divided into two stages: primary curing and secondary curing. The primary curing temperature is low and the time is long. A uniform and stable state is formed by slow curing. The secondary curing temperature is high and the time is short, which is a reinforcement of the primary curing. In this way, it is more conducive to forming a uniform solid optical material with excellent optical properties. In addition, the appearance and quality of the solid optical material obtained after grinding and splicing are better.

[0043] According to an embodiment of the third aspect of the present invention, the present invention provides an application of a solid optical material according to an embodiment of the first aspect of the present invention or a solid optical material prepared by the preparation method of the second aspect of the present invention in static three-dimensional imaging in space.

[0044] According to a specific embodiment of the present invention, the solid optical material of the present invention can be applied to the field of spatial static three-dimensional imaging by utilizing the photochromic characteristics of the solid optical material of the present invention. Such an arrangement provides more raw materials for the research of spatial static three-dimensional imaging. Furthermore, the raw materials of the solid optical material of the present invention are cheap and easy to obtain, and the preparation process is simple. And the process of imaging using the solid optical material of the present invention is simple. Therefore, the application potential is greater. The spatial static three-dimensional imaging here refers to a static volumetric three-dimensional display (static volumetric 3D display) in a three-dimensional space, which can also be called static volumetric three-dimensional imaging. The static body refers to the imaging volume or space composed of a fixed medium, in order to distinguish it from a scanning volumetric three-dimensional or a shaking volumetric three-dimensional. Spatial static three-dimensional imaging can also be called true static three-dimensional imaging, which is real three-dimensional imaging. Therefore, the spatial static three-dimensional imaging here is different from the three-dimensional imaging formed by VR glasses. The three-dimensional imaging formed by VR glasses is a visually illusory three-dimensional imaging, which is actually a two-dimensional imaging, not a spatial three-dimensional imaging.

[0045] According to some embodiments of the present invention, the following steps are included: Figure 1-Figure 3 As shown, the solid optical material is irradiated with ultraviolet light, so that the structure of salicylaldehyde 4-chloroaniline changes to obtain a brown solid optical material. In this way, when the solid optical material of the present invention is irradiated with ultraviolet light, the salicylaldehyde 4-chloroaniline molecules at the irradiated part of the solid optical material of the present invention undergo proton transfer under the irradiation of ultraviolet light, so that the structure of the salicylaldehyde 4-chloroaniline molecules changes, and then the solid optical material changes from colorless and transparent to brown, thereby producing a photochromic phenomenon.

[0046] The solid optical material is irradiated with green light. In this way, the solid optical material of the present invention can be irradiated with green light alone or with ultraviolet light simultaneously or successively.

[0047] In the solid optical material, the intersection of ultraviolet light and green light is excited to emit red fluorescence, forming a red three-dimensional spatial image, that is, realizing spatial static three-dimensional imaging. In this way, in the solid optical material, ultraviolet light and green light intersect, and can be excited to produce fluorescence at the intersection to form a red three-dimensional spatial figure. In this way, the solid optical material of the present invention combines an ultraviolet light source, a green light source and a simple optical path design, so that green light and ultraviolet light intersect in the solid optical material of the present invention, and spatial static three-dimensional imaging can be realized at the intersection of external light and green light. It should be pointed out that when the solid optical material of the present invention is not irradiated with ultraviolet light, the above-mentioned green light is used alone to directly irradiate the solid optical material of the present invention, and the green light will directly pass through the solid optical material without generating fluorescence. Alternatively, when green light is used to irradiate the part of the solid optical material that is not irradiated with ultraviolet light, the green light will directly pass through the solid optical material without generating fluorescence.

[0048] According to a specific embodiment of the present invention, the photochromic characteristics of the solid optical material of the present invention are utilized to apply it to the field of static three-dimensional imaging in space. Among them, the photochromic characteristics of the solid optical material of the present invention refer to that the solid optical material of the present invention is irradiated with ultraviolet light and green light respectively, and at the intersection of ultraviolet light and green light, the solid optical material of the present invention emits red fluorescence to form a red three-dimensional spatial pattern. Here, ultraviolet light and green light can simultaneously irradiate the solid optical material to form a red three-dimensional spatial pattern, or the solid optical material of the present invention can be irradiated with green light first and then with ultraviolet light, or the solid optical material of the present invention can be irradiated with ultraviolet light first and then with green light. The specific process and principle of the imaging of the solid optical material of the present invention are as follows: when ultraviolet light irradiates the solid optical material of the present invention, the salicylaldehyde 4-chloroaniline molecule in the irradiated part of the solid optical material undergoes proton transfer, so that the structure of the salicylaldehyde 4-chloroaniline molecule changes, thereby causing the solid optical material to change from colorless and transparent to present a brownish yellow color, thereby producing a photochromic phenomenon. When green light is used to irradiate solid optical materials, the green light can pass through the solid optical materials. If the green light and ultraviolet light intersect in the solid optical materials, the intersection of ultraviolet light and green light can be excited to produce fluorescence, forming a red spatial three-dimensional graphic. That is, spatial static three-dimensional imaging is achieved. And the image is clear and does not diffuse. Furthermore, if visible light is used to irradiate the solid optical material that has been imaged, the discolored area can be restored to transparency, thereby achieving static erasure of the image. In this way, by selecting appropriate ultraviolet light, visible light, and combining a simple optical path, the writing and erasing of three-dimensional graphics can be achieved. Among them, the erasing speed of the three-dimensional graphics is positively correlated with the wavelength and intensity of the light source. In addition, the chemical properties of salicylaldehyde condensed 4-chloroaniline are stable, and the solid optical material can be reused many times.

[0049] According to a specific embodiment of the present invention, Figure 1 - Figure 3 As shown, salicylaldehyde 4-chloroaniline can undergo a photochromic reaction under the sequential irradiation of ultraviolet light and green light source, so that the solid optical material with salicylaldehyde 4-chloroaniline as a color switch can be applied in the field of spatial static three-dimensional imaging.

[0050] According to some embodiments of the present invention, the following steps are included: S1: using ultraviolet light to irradiate a solid optical material, so that the structure of salicylaldehyde 4-chloroaniline changes to obtain a brown-yellow solid optical material. Specifically, firstly, ultraviolet light is used to irradiate the solid optical material of the present invention, so that the part of the solid optical material irradiated by the ultraviolet light undergoes a photochromic phenomenon. Specifically, the salicylaldehyde 4-chloroaniline molecules in the solid optical material undergo proton transfer under ultraviolet light irradiation, so that the structure of the salicylaldehyde 4-chloroaniline molecules changes. The solid optical material changes from colorless and transparent to brown-yellow, thereby producing a photochromic phenomenon.

[0051] S2: Use green light to irradiate the brown-yellow solid optical material in step S1. In the solid optical material, the intersection of ultraviolet light and green light is excited to emit red fluorescence, forming a red spatial three-dimensional image, that is, realizing spatial static three-dimensional imaging. In this way, a green light source is used to excite the solid optical material that has become brown-yellow due to ultraviolet light irradiation in S1, and fluorescence emission is generated at the intersection of green light and the color-changing area to form a red spatial three-dimensional figure. In this way, ultraviolet light can be used to irradiate the solid optical material of the present invention to produce photochromism, and then green light can be used to irradiate the color-changing part of the solid optical material. Combined with a simple optical path design, fluorescence emission is generated at the intersection of green light and the color-changing area to form a red spatial three-dimensional figure. In this way, spatial static three-dimensional imaging can be realized. Furthermore, before the green light is irradiated, the part irradiated by ultraviolet light has already produced light color change, which is convenient for observation. When the green light is irradiated, it is easier to determine the intersection.

[0052] According to a specific embodiment of the present invention, the solid optical material of the present invention can be applied to the field of static three-dimensional imaging in space by utilizing the photochromic characteristics of the solid optical material of the present invention. First, the solid optical material of the present invention is irradiated with ultraviolet light, and the salicylaldehyde 4-chloroaniline molecule in the solid optical material undergoes proton transfer under ultraviolet light irradiation, so that the structure of the salicylaldehyde 4-chloroaniline molecule changes. The solid optical material on the optical path changes from colorless and transparent to brownish yellow, thereby generating a photochromic phenomenon. Then green light is used to irradiate and excite the above-mentioned brownish yellow solid optical material, and fluorescence emission is generated at the intersection of visible light and the discoloration area. A stable three-dimensional image in space (i.e., static three-dimensional imaging in space) can be formed, and the image is clear and does not diffuse. Furthermore, if the solid optical material that has been imaged is irradiated with visible light, the discoloration area can be restored to transparency, thereby realizing static erasure of the image. In this way, by selecting appropriate ultraviolet light and visible light, combined with a simple optical path, the writing and erasing of three-dimensional graphics can be realized.

[0053] According to some embodiments of the present invention, the brown-yellow solid optical material in step S1 is the base plate for spatial static three-dimensional imaging, and the direction of green light irradiation in step S2 is perpendicular to the plane where the base plate is located. In this way, the brown-yellow solid optical material can be used as the base plate for spatial static three-dimensional imaging, and the green light in step S2 can be used as a writing tool to form a spatial static three-dimensional image as needed.

[0054] According to some embodiments of the present invention, the following steps are included: S1: Figure 2 As shown, green light is used to irradiate the solid optical material. At this time, the green light can penetrate the solid optical material and form an optical path in the solid optical material. And because the solid optical material is irradiated with green light alone, no fluorescence or light discoloration occurs.

[0055] S2: Using ultraviolet light to irradiate the solid optical material of step S1, in the solid optical material, the intersection of ultraviolet light and green light is excited to emit red fluorescence, forming a red spatial three-dimensional image, that is, realizing spatial static three-dimensional imaging. In this way, ultraviolet light is used to irradiate the solid optical material in S1, and fluorescence emission is generated at the intersection of the light path of green light and the light path of ultraviolet light to form a red spatial three-dimensional figure. In this way, the solid optical material of the present invention can be irradiated with green light first, and the light path of green light is formed in the solid optical material, and then ultraviolet light is used to irradiate the solid optical material so that the irradiated part produces photochromism, combined with a simple light path design, fluorescence emission is generated at the intersection of the color change area (light path of ultraviolet light) and the light path of green light to form a red spatial three-dimensional figure. In this way, spatial static three-dimensional imaging can be realized. In this way, green light can be used to irradiate the solid optical material first, so that the light path of green light is formed in the solid optical material, and then ultraviolet light is used to irradiate the solid optical material of the present invention and it is irradiated to produce photochromism, and fluorescence emission is generated at the intersection of the green light and the color change area to form a red spatial three-dimensional figure.

[0056] According to a specific embodiment of the present invention, the solid optical material of the present invention can be applied to the field of static three-dimensional imaging in space by utilizing the photochromic characteristics of the solid optical material of the present invention. First, the solid optical material of the present invention is irradiated with green light, and the green light penetrates the solid optical material and forms an optical path in the solid optical material. Then, the solid optical material of the present invention is irradiated with ultraviolet light, and the salicylaldehyde 4-chloroaniline molecule in the solid optical material undergoes proton transfer under ultraviolet light irradiation, so that the structure of the salicylaldehyde 4-chloroaniline molecule changes. The solid optical material changes from colorless and transparent to brownish yellow, thereby generating a photochromic phenomenon. Fluorescence emission is generated at the intersection of the green light and the discolored area. A stable three-dimensional image in space (i.e., static three-dimensional imaging in space) can be formed, and the image is clear and does not diffuse. Furthermore, if the solid optical material that has been imaged is irradiated with visible light, the discolored area can be restored to transparency, thereby realizing static erasure of the image. In this way, by selecting appropriate ultraviolet light and visible light, combined with a simple optical path, the writing and erasing of three-dimensional graphics can be realized.

[0057] According to some embodiments of the present invention, the optical path of the green light in the solid optical material after the green light irradiation in step S1 is used as the base plate for spatial static three-dimensional imaging, and the direction of ultraviolet light irradiation in step S2 is perpendicular to the plane where the base plate is located. In this way, the optical path of the green light in the solid optical material can be used as the base plate for spatial static three-dimensional imaging, and the ultraviolet light in step S2 can be used as a writing tool to form a spatial static three-dimensional image as needed.

[0058] According to some embodiments of the present invention, the wavelength of the ultraviolet light is λ1, wherein λ1 satisfies: 365nm≤λ1≤395nm. In this configuration, the ultraviolet light within the wavelength range can change the structure of salicylaldehyde condensed with 4-chloroaniline to obtain a brown solid optical material.

[0059] According to some embodiments of the present invention, the wavelength of green light is λ2, where λ2 satisfies: 488nm≤λ2≤532nm. In this configuration, green light within the wavelength range can excite the brownish-yellow solid optical material in step S1 to produce fluorescence, thereby achieving spatial static three-dimensional imaging.

[0060] According to some embodiments of the present invention, the power of the ultraviolet light source is W1, wherein W1 satisfies: 60mW≤W1≤300mW. The power of the green light source is W2, wherein W2 satisfies: 50mW≤W2≤120mW. This provides sufficient energy for imaging of the solid optical material of the present invention.

[0061] Specifically, it can be combined Figure 2 - Figure 3 As shown, the process of spatial static three-dimensional imaging of the present invention is as follows: ultraviolet light with a power of 60mW to 300mW and a wavelength of 365 to 395nm is used to irradiate the material from the bottom to obtain a spatial color-changing plane similar to a blackboard; in a direction perpendicular to the color-changing plane, a laser light source (green light) with a power of 60mW to 300mW and a wavelength of 365 to 395nm is controlled by a galvanometer to project a circular ring pattern, which intersects with visible light in the color-changing area to produce a red spatial circular ring pattern, thereby realizing volumetric three-dimensional display, that is, spatial static three-dimensional imaging.

[0062] According to some embodiments of the present invention, at room temperature and natural light intensity of 300 Lux to 500 Lux, the image of the spatial static three-dimensional imaging is stored for 1 to 3 seconds. In this way, at room temperature and natural light conditions, the image of the spatial static three-dimensional imaging can disappear within 1 to 3 seconds. In this way, the spatial static three-dimensional image of the present invention can be quickly erased.

[0063] Specific exemplary embodiments

[0064] Example 1

[0065] A solid optical material comprises the following raw materials: salicylaldehyde 4-chloroaniline, methyl methacrylate and an initiator, wherein the solid-liquid ratio of salicylaldehyde 4-chloroaniline and methyl methacrylate satisfies: 0.5 mg:10 ml, and the solid-liquid ratio of the initiator and methyl methacrylate satisfies: 2 mg:1 ml; the initiator is azobisisobutyronitrile; the concentration of salicylaldehyde 4-chloroaniline in the solid optical material is m, wherein m satisfies: m=0.05 mg / ml.

[0066] The preparation method thereof comprises the following steps:

[0067] Step 1: Add 20 mg of salicylaldehyde 4-chloroaniline to 400 ml of methyl methacrylate and disperse evenly, add 800 mg of azobisisobutyronitrile, and stir rapidly for 3 minutes to fully dissolve it;

[0068] Step 2: Heat the solution of step 1 to 75°C and stir to fully react until the reaction solution becomes viscous;

[0069] Step 3: Pour the viscous reaction liquid of step 2 into the mold, and perform the initial curing at 45°C for 30 hours. After the initial curing, heat it to 100°C and cure it again for 1 hour to complete the curing;

[0070] Step 4: Cut, grind and splice the solidified material in step 3 to obtain a colorless transparent solid of 4*4*5 cm. Figure 3 As shown in a.

[0071] Example 2

[0072] A solid optical material comprises the following raw materials: salicylaldehyde 4-chloroaniline, methyl methacrylate and an initiator, wherein the solid-liquid ratio of salicylaldehyde 4-chloroaniline and methyl methacrylate satisfies: 0.5 mg: 30 ml, and the solid-liquid ratio of the initiator and methyl methacrylate satisfies: 1 mg: 0.5 ml; the initiator is peroxybenzamide; the concentration of salicylaldehyde 4-chloroaniline in the solid optical material is m, wherein m satisfies: m=0.01 mg / ml.

[0073] The preparation method thereof comprises the following steps:

[0074] Step 1: add 10 mg of salicylaldehyde 4-chloroaniline to 600 ml of methyl methacrylate and disperse evenly, then add 1200 mg of benzamide peroxide and stir rapidly for 5 minutes to fully dissolve the mixture to obtain a solution;

[0075] Step 2: Heat the solution of step 1 to 100° C. and stir to allow it to react fully until the reaction liquid becomes viscous;

[0076] Step 3: Pour the viscous reaction liquid in step 2 into the mold, and initially cure it at 60°C for 30 hours. After the initial curing, heat it to 120°C and cure it again for 1.5 hours to complete the curing;

[0077] Step 4: Cut, grind and splice the solidified material in step 3 to obtain a colorless and transparent solid of 4*4*5 cm.

[0078] Example 3

[0079] A solid optical material comprises the following raw materials: salicylaldehyde 4-chloroaniline, methyl methacrylate and initiator; the solid-liquid ratio of salicylaldehyde 4-chloroaniline and methyl methacrylate satisfies: 0.5 mg: 20 ml, and the solid-liquid ratio of the initiator and methyl methacrylate satisfies: 3 mg: 0.5 ml; the initiator is a mixture of azobisisoheptylnitrile and lauroyl peroxide in equal weight ratio; the concentration of salicylaldehyde 4-chloroaniline in the solid optical material is m, wherein m satisfies: m=0.025 mg / ml.

[0080] The preparation method thereof comprises the following steps:

[0081] Step 1: Add 10 mg of salicylaldehyde 4-chloroaniline and 2400 mg of initiator into a beaker containing 400 ml of methyl methacrylate, and stir to fully dissolve the mixture to obtain a solution;

[0082] Step 2: Heat the solution of step 1 to 75°C and stir to allow it to react fully until the reaction solution becomes viscous;

[0083] Step 3: pour the viscous reaction liquid in step 2 into the mold, and initially cure it at 50° C. for 25 hours. After the initial curing, heat it to 100° C. and cure it again for 1.0 hour to complete the curing;

[0084] Step 4: Cut, grind and splice the solidified material in step 3 to obtain a colorless and transparent solid of 4*4*5 cm.

[0085] Example 4

[0086] A solid optical material comprises the following raw materials: salicylaldehyde 4-chloroaniline, methyl methacrylate and an initiator, wherein the solid-liquid ratio of salicylaldehyde 4-chloroaniline and methyl methacrylate satisfies: 1.5 mg:10 ml, and the solid-liquid ratio of the initiator and methyl methacrylate satisfies: 1 mg:1.5 ml; the initiator comprises a mixture of lauroyl peroxide and cumene hydroperoxide in equal weights; the concentration of salicylaldehyde 4-chloroaniline in the solid optical material is m, wherein m satisfies: m=0.1 mg / ml.

[0087] The preparation method is basically the same as that of Example 1.

[0088] Example 5

[0089] An application of a solid optical material in static three-dimensional imaging in space comprises the following steps:

[0090] like Figure 3As shown, S1: using ultraviolet light to irradiate the colorless and transparent solid optical material a of the specific embodiment of the present invention, so that the structure of salicylaldehyde condensed with 4-chloroaniline changes to obtain a brown solid optical material b; the light source of the ultraviolet light is an LED light source with a wavelength of 365nm and a power of 200mW;

[0091] S2: Use green light to irradiate the brown-yellow solid optical material in step S1 to stimulate the irradiated part to emit red fluorescence to form a red spatial three-dimensional image, that is, to achieve spatial static three-dimensional imaging.

[0092] Among them, the brown-yellow solid optical material in step S1 is the base plate for spatial static three-dimensional imaging, and the direction of green light irradiation in step S2 is perpendicular to the plane of the base plate; the green light source is a 532nm laser light source of 50mW controlled by a galvanometer, and the green light source projects a circular ring pattern, which intersects with the visible light in the color-changing area to produce a red three-dimensional circular ring pattern, thereby realizing spatial static three-dimensional imaging, as shown in c.

[0093] In the description of the present invention, "plurality" means two or more.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0095] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An application of solid optical materials in static three-dimensional imaging in space, characterized in that: The steps include: The solid optical material is irradiated with ultraviolet light to change the structure of salicylaldehyde condensed with 4-chloroaniline to obtain a brown solid optical material; irradiating the solid optical material with green light; In the solid optical material, the intersection of the ultraviolet light and the green light is excited to emit red fluorescence, forming a red spatial three-dimensional image, that is, achieving spatial static three-dimensional imaging; The solid optical material comprises a colorless and transparent solid prepared from the following raw materials: salicylaldehyde 4-chloroaniline, methyl methacrylate and an initiator, wherein the solid-liquid ratio of the salicylaldehyde 4-chloroaniline and the methyl methacrylate satisfies: 0.5mg-1.5mg:10ml-30ml; the solid-liquid ratio of the initiator and the methyl methacrylate satisfies: 1mg-3mg:0.5ml-1.5ml.

2. The use according to claim 1, characterized in that: The steps include: S1: irradiating the solid optical material with ultraviolet light to change the structure of salicylaldehyde condensed with 4-chloroaniline to obtain a brown solid optical material; S2: Use green light to irradiate the brown-yellow solid optical material in step S1. In the solid optical material, the intersection of the ultraviolet light and the green light is excited to emit red fluorescence, forming a red spatial three-dimensional image, that is, realizing spatial static three-dimensional imaging.

3. The use according to claim 2, characterized in that: The brown-yellow solid optical material in step S1 is a base plate for spatial static three-dimensional imaging, and the direction of green light irradiation in step S2 is perpendicular to the plane of the base plate.

4. The use according to claim 1, characterized in that: The steps include: S1: irradiating the solid optical material with green light; S2: Using ultraviolet light to irradiate the solid optical material described in step S1, in the solid optical material, the intersection of the ultraviolet light and the green light is excited to emit red fluorescence, forming a red spatial three-dimensional image, that is, realizing spatial static three-dimensional imaging.

5. The use according to claim 4, characterized in that: The optical path of the green light in the solid optical material after the green light irradiation in step S1 is used as the base plate for spatial static three-dimensional imaging, and the direction of ultraviolet light irradiation in step S2 is perpendicular to the plane where the base plate is located.

6. The use according to any one of claims 1 to 5, characterized in that: The wavelength of the ultraviolet light is λ1, wherein λ1 satisfies: 365nm≤λ1≤395nm; and / or The wavelength of the green light is λ2, wherein λ2 satisfies: 488nm≤λ2≤532nm; and / or The power of the ultraviolet light source is W1, wherein W1 satisfies: 60mW≤W1≤300mW; and / or The power of the green light source is W2, wherein W2 satisfies: 50mW≤W2≤120mW.

7. The use according to any one of claims 1 to 5, characterized in that: At room temperature and natural light intensity of 300 Lux to 500 Lux, the spatial static three-dimensional imaging image is stored for 1 to 3 seconds.

8. The use according to claim 1, characterized in that: The solid-liquid ratio of the salicylaldehyde 4-chloroaniline and the methyl methacrylate satisfies: 1.0 mg: 20 ml; the solid-liquid ratio of the initiator and the methyl methacrylate satisfies: 2 mg: 1 ml.

9. The use according to claim 1, characterized in that: The initiator includes at least one of an azo compound initiator and a peroxide initiator.

10. The use according to claim 9, characterized in that: The initiator comprises at least one of azobisisobutyronitrile, azobisisoheptylnitrile, dimethyl azobisisobutyrate, benzamide peroxide, lauroyl peroxide, cumene hydroperoxide and methyl ethyl ketone peroxide.

11. The use according to claim 10, characterized in that: The initiator is azobisisobutyronitrile.

12. The use according to claim 1, characterized in that: The concentration of salicylaldehyde 4-chloroaniline in the solid optical material is m, wherein m satisfies: 0.01 mg / ml≤m≤0.1 mg / ml.

13. The use according to claim 12, characterized in that: m=0.05mg / ml.

14. The use according to any one of claims 1, 8-13, characterized in that: The preparation method of the solid optical material comprises the following steps: mixing salicylaldehyde condensed with 4-chloroaniline in the material ratio with the initiator and methyl methacrylate for reaction, and curing by heating to obtain a colorless and transparent solid.

15. The use according to claim 14, characterized in that: The steps include: Step 1, dispersing salicylaldehyde condensed with 4-chloroaniline in the material ratio into methyl methacrylate, adding an initiator, stirring, and fully dissolving the initiator to obtain a solution; Step 2: heating the solution in step 1 to 50-100° C. and stirring to allow the solution to react fully until the reaction liquid becomes viscous; Step 3: Pour the viscous reaction liquid of step 2 into the mold, and initially cure it at 45-60°C for 20-30h. After the initial curing, heat it to 80-120°C and cure it again for 0.5-1.5h to complete the curing; Step 4: Cut, grind and splice the solidified material in step 3 to obtain a colorless and transparent solid.

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