OMTD photoelectric mapping transparent display film with light transmittance adjusting function and preparation method of OMTD photoelectric mapping transparent display film

Abstract

The invention discloses an OMTD photoelectric mapping transparent display film with a light transmittance adjusting function and a preparation method of the OMTD photoelectric mapping transparent display film, and belongs to the technical field of transparent display films. The transparent display film comprises an electric control dimming film layer, a fluorescent layer, an adhesive layer and a release material layer, wherein the fluorescent layer comprises the following raw materials in parts by weight: 80-100 parts of polyurethane resin, 2-5 parts of a fluorescent agent, 3-6 parts of a dispersing agent, 1-10 parts of a curing agent and 200 parts of a solvent; the prepared transparent display film has excellent transparency, tensile property and self-repairing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of transparent display films, and particularly to an OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function and a preparation method thereof. Background Art

[0002] The OMTD (Opto-electronic mapping transparent display film) optoelectronic mapping transparent display film is a new type of functional optoelectronic thin film. By controlling an external electric field, the optoelectronic thin film can be transformed between a colorless transparent state and a milky white opaque state. With the progress of the dimming film technology and the continuous improvement of its performance, the optoelectronic mapping transparent display film has begun to be applied to automobiles. In order to meet the market's demands for personalization and aesthetics, by adding fluorescent dyes with different wavelengths, the OMTD optoelectronic film can display different patterns, thus providing users with more personalized choices. However, when the optoelectronic mapping transparent display film is applied to an automobile sunroof, there are problems of insufficient transparency, which limits its performance in display clarity and visual experience; secondly, insufficient display brightness is also a problem. Especially in an environment with strong natural light, the brightness of the transparent display is often difficult to compete with the background light, resulting in poor display effects. Moreover, during the long-term use of some transparent films, due to factors such as the aging of the material itself and surface contamination, the light transmittance will gradually decrease, resulting in a continuous deterioration of the display effect and increasing the cost of maintenance and renewal. On the other hand, the bonding performance of some adhesives is not stable enough, and it is easy to have a decrease in viscosity after long-term use, resulting in problems such as detachment and bubbles between the transparent display film and the substrate. This not only affects the flatness and aesthetics of the display, but may also introduce light reflection and scattering, further interfering with the light transmission effect and deteriorating the performance of the display film that already has a light transmittance problem. Secondly, some adhesives have poor optical properties, such as absorption or scattering in the visible light band, which interferes with the light transmission and reduces the overall light transmittance of the transparent display film.

[0003] Chinese Patent No. CN108285746A discloses a transparent display film with a blue light protection function, a preparation method thereof, and a projection system with the transparent display film. The transparent display film includes a projection display layer, a substrate layer, an adhesive layer, and a release material layer stacked in sequence; the raw material formula of the projection display layer contains 70-99.4% of resin, 0.1%-5% of scattering particle materials, 0.3%-9% of blue light absorbers, 0.1%-6% of dispersants, and 0.1%-10% of curing agents. The obtained transparent display film contains a blue light absorber, so that the remaining high-energy blue light is absorbed by the blue light absorber, but its transparency, fluorescence brightness, anti-aging and other properties are poor. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function and a preparation method thereof.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: An OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function, comprising an electro-controlled dimming film layer, a fluorescent layer, an adhesive layer, and a release material layer; The fluorescent layer comprises the following raw materials in parts by weight: 80-100 parts of polyurethane resin, 2-5 parts of fluorescent agent, 3-6 parts of dispersant, 1-10 parts of curing agent, and 200 parts of solvent; The fluorescent agent is prepared by the following method: S1: 4-bromo-1,8-naphthalic anhydride reacts with 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl hydrazide to generate a hindered phenol compound; S2: The hindered phenol compound reacts with octadecanethiol under the action of potassium carbonate to generate a fluorescent agent.

[0006] In the step S1, the feeding molar ratio of 4-bromo-1,8-naphthalic anhydride to 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl hydrazide is 1:(2-2.5).

[0007] In the step S2, the feeding molar ratio of the hindered phenol compound to octadecanethiol is 1:(1.2-1.5).

[0008] The adhesive used in the adhesive layer is prepared by the following method: A1: Sodium alginate reacts with dodecyl glycidyl ether under the action of sodium hydroxide to generate alkyl-modified sodium alginate; A2: Alkyl-modified sodium alginate reacts with dopamine hydrochloride to generate dopamine-modified sodium alginate; A3: Dopamine-modified sodium alginate reacts with borax to generate an adhesive.

[0009] In the step A1, the feeding mass ratio of sodium alginate to dodecyl glycidyl ether is 3:1.

[0010] In the step A2, the feeding mass ratio of alkyl-modified sodium alginate to dopamine hydrochloride is 6:1.

[0011] In the step A3, the feeding mass ratio of dopamine-modified sodium alginate to borax is 5:1.

[0012] The release material layer is a polyethylene release film.

[0013] The dispersant is one of Solsperse-32500, Solsperse-6000, and Solsperse-39000; the curing agent is one of Desmodur N3300, Desmodur N3390, and Desmodur N3600; the solvent is xylene.

[0014] A method for preparing an OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function includes the following steps: (1): Weigh by weight: 80-100 parts of polyurethane resin, 2-5 parts of fluorescent agent, 3-6 parts of dispersant, 1-10 parts of curing agent, and 200 parts of solvent; stir and mix evenly to obtain a fluorescent resin material; (2): Uniformly coat the fluorescent resin material on one side surface of the electrochromic film layer with a microgravure roll and cure it to form a fluorescent layer; (3): Coat an adhesive on the other side surface of the electrochromic film layer to obtain an adhesive layer; (4): Composite the release film layer with the adhesive layer, and wind it up to obtain a transparent display film.

[0015] Due to the above technical solutions, the beneficial effects of the present invention include: (1) The fluorescent agent prepared by the present invention realizes efficient light emission through the rigid conjugate structure of naphthalenedicarboxylic anhydride derivatives, improving the light emission efficiency and color saturation of the display film; long-chain thiols inhibit the aggregation of the fluorescent agent, ensuring uniform dispersion and light transmittance. At the same time, hindered phenols capture free radicals and absorb UV, delaying film oxidation and yellowing; hydrophobic alkyl chains enhance matrix compatibility, reduce phase separation, and maintain the long-term stability and transparency of the film.

[0016] (2) The adhesive prepared by the present invention can significantly improve the performance of the transparent display film. The strong adhesion of dopamine hydrochloride and the dynamic crosslinking of borax enhance the interfacial bonding force and mechanical strength. The hydrophobic effect of alkyl chains can improve compatibility, and at the same time keep the light-transmitting film with a light transmittance of more than 90%. Specific embodiments

[0017] The following is further described in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0018] Example 1 Preparation of fluorescent agent: S1: Add 500 ml of absolute ethanol, 0.1 mol of 4-bromo-1,8-naphthalic anhydride and 0.2 mol of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl hydrazide into the reactor, stir and mix evenly. After heating to reflux for 4 h, cool to room temperature, slowly add 800 ml of deionized water, stir evenly, let it stand, precipitate, filter, wash three times with deionized water (100 ml each time), and dry in vacuum at 50 °C for 12 h to obtain the hindered phenol compound. The reaction equation is shown as follows:

[0019] The 1H NMR data are as follows: 1 H NMR (500 MHz, Chloroform-d) δ 9.49 (s, 1H), 8.32 (dd, J = 8.2, 1.1Hz, 1H), 8.30 – 8.23 (m, 2H), 7.95 (dd, J = 8.7, 0.5 Hz, 1H), 7.70 (dd, J =8.2, 7.7 Hz, 1H), 6.97 (t, J = 0.8 Hz, 2H), 4.69 (s, 1H), 2.80 (tq, J = 8.4,0.9 Hz, 2H), 2.69 – 2.62 (m, 2H), 1.41 (s, 18H). S2: Add 500 ml of toluene, 0.12 mol of octadecanethiol and 0.2 mol of anhydrous potassium carbonate into the reactor, stir at room temperature for 0.5 h, then add 0.1 mol of the hindered phenol compound, heat to 50 °C and react for 8 h, then distill under reduced pressure at 60 °C for 2 h, and separate and purify by column chromatography (eluent ratio: petroleum ether / ethyl acetate = 5:1, silica gel 200 - 300 mesh) to obtain the fluorescent agent. The reaction equation is shown as follows:

[0020] The 1H NMR data are as follows: 11H NMR (500 MHz, Chloroform-d) δ 9.49 (s, 1H), 8.45 (d, J = 7.8 Hz, 1H), 8.37 – 8.29 (m, 2H), 7.65 (dd, J = 8.2, 7.5 Hz, 1H), 7.55 (dd, J = 7.7, 0.5 Hz, 1H), 6.97 (t, J = 0.8 Hz, 2H), 4.69 (s, 1H), 3.16 (t, J = 6.2 Hz, 2H), 2.80 (tq, J = 8.4, 0.9 Hz, 2H), 2.69 – 2.62 (m, 2H), 1.78 (p, J = 6.4 Hz, 2H), 1.45 – 1.36 (m, 20H), 1.35 – 1.22 (m, 28H), 0.94 – 0.85 (m, 3H).

[0021] Example 2 Preparation of fluorescent agent: S1: Add 500 ml of absolute ethanol, 0.1 mol of 4-bromo-1,8-naphthalic anhydride and 0.22 mol of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl hydrazide into the reactor, stir and mix evenly, heat up to reflux for 5 h, then cool to room temperature, slowly add 800 ml of deionized water, stir evenly, stand still, precipitate, filter, wash three times with deionized water (100 ml each time), and dry in vacuum at 50 °C for 12 h to obtain the hindered phenol compound; S2: Add 500 ml of toluene, 0.14 mol of octadecanethiol and 0.2 mol of anhydrous potassium carbonate into the reactor, stir at room temperature for 0.5 h, then add 0.1 mol of the hindered phenol compound, heat up to 60 °C and react for 7 h, then distill under reduced pressure at 60 °C for 2 h, and separate and purify by column chromatography (eluent ratio: petroleum ether / ethyl acetate = 5:1, silica gel 200 - 300 mesh) to obtain the fluorescent agent.

[0022] Example 3 Preparation of fluorescent agent: S1: Add 500 ml of absolute ethanol, 0.1 mol of 4-bromo-1,8-naphthalic anhydride and 0.25 mol of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl hydrazide into the reactor, stir and mix evenly, heat up to reflux for 6 h, then cool to room temperature, slowly add 800 ml of deionized water, stir evenly, stand still, precipitate, filter, wash three times with deionized water (100 ml each time), and dry in vacuum at 50 °C for 12 h to obtain the hindered phenol compound; S2: Add 500 ml of toluene, 0.15 mol of octadecanethiol, and 0.2 mol of anhydrous potassium carbonate into the reactor, stir at room temperature for 0.5 h, then add 0.1 mol of hindered phenol compound, raise the temperature to 70 °C and react for 6 h, then carry out vacuum distillation at 60 °C for 2 h, and obtain the fluorescent agent after separation and purification by column chromatography (eluent ratio: petroleum ether / ethyl acetate = 5:1, silica gel 200 - 300 mesh).

[0023] Example 4 Preparation of Adhesive: A1: Add 400 ml of deionized water into the reactor, raise the temperature to 25 °C, start stirring, add 60 g of sodium alginate in batches (20 g per batch, batch interval 5 min), stir for 1 h, slowly add 10 wt% sodium hydroxide solution to adjust the pH to 10, slowly dropwise add 100 ml of ethanol solution of dodecyl glycidyl ether (containing 20 g of dodecyl glycidyl ether), the dropping time is 40 min, after dropping, continue to react at 25 °C for 6 h, then pour the reaction solution into 1500 ml of absolute ethanol, stir to precipitate, centrifuge to collect the solid, wash with 70 wt% ethanol 3 times (200 ml each time), and vacuum dry at 40 °C for 8 h to obtain alkyl-modified sodium alginate; in this reaction, part of the carboxyl groups in sodium alginate undergo ring-opening reaction with the epoxy groups of dodecyl glycidyl ether; A2: Under ice bath, add 400 ml of PBS buffer solution (0.1 M, pH = 5.5), 60 g of alkyl-modified sodium alginate, 8 g of EDC, and 5 g of NHS into the reactor, stir for 30 min, protect with nitrogen, slowly dropwise add the PBS solution of hydrochloric acid dopamine and ascorbic acid (10 g of hydrochloric acid dopamine and 0.5 g of sodium ascorbate are added to 50 ml of PBS buffer solution (0.1 M, pH = 5.5), mix well, prepare in the dark and then drop all of it), the dropping time is 20 min, after reacting at 4 °C for 12 h, add 10 ml of 1 M Tris-HCl solution, dialyze with deionized water at 4 °C (MwCO = 5 kDa) for 72 h, and freeze-dry at -80 °C for 24 h to obtain dopamine-modified sodium alginate; in this reaction, the remaining part of the carboxyl groups in alkyl-modified sodium alginate react with the amino groups in hydrochloric acid dopamine; A3: Add 400 ml of PBS buffer solution (0.1 M, pH = 8.5) and 50 g of dopamine-modified sodium alginate into the reactor, stir for 2 h, then slowly dropwise add 50 ml of aqueous borax solution (containing 10 g of borax), the dropping time is 20 min, after dropping, raise the temperature to 50 °C and continue to react for 4 h, add 5 mL of 1 M HCl to adjust the pH to 7.0, carry out vacuum distillation at 60 °C for 2 h, then add 20 ml of glycerol and 80 ml of deionized water, stir and mix well to obtain the adhesive; in this reaction, the hydroxyl groups in dopamine-modified sodium alginate react with B-OH in borax to form borate bonds.

[0024] Example 5 Preparation of Transparent Display Film: (1): Weigh 800 g of polyurethane resin, 20 g of fluorescent agent (prepared in Example 1), 30 g of dispersant (Solsperse-32500), 10 g of curing agent (Desmodur N3300), and 2000 g of xylene, and stir and mix evenly to obtain a fluorescent resin material; (2): Uniformly coat the fluorescent resin material on one side surface of the electrochromic film with a microgravure roll, and cure and form it to obtain a fluorescent layer with a thickness of 50 μm; (3): Coat an adhesive (prepared in Example 4) on the other side surface of the electrochromic film with a coating machine to form an adhesive layer with a thickness of 30 μm; (4): Compound the polyethylene release film with the adhesive layer, and wind it up to obtain a transparent display film.

[0025] Preparation of the transparent display film in Example 6: (1): Weigh 900 g of polyurethane resin, 30 g of fluorescent agent (prepared in Example 2), 45 g of dispersant (Solsperse-6000), 50 g of curing agent (Desmodur N3390), and 2000 g of xylene, and stir and mix evenly to obtain a fluorescent resin material; (2): Uniformly coat the fluorescent resin material on one side surface of the electrochromic film with a microgravure roll, and cure and form it to obtain a fluorescent layer with a thickness of 50 μm; (3): Coat an adhesive (prepared in Example 4) on the other side surface of the electrochromic film with a coating machine to form an adhesive layer with a thickness of 30 μm; (4): Compound the polyethylene release film with the adhesive layer, and wind it up to obtain a transparent display film.

[0026] Preparation of the transparent display film in Example 7: (1): Weigh 1000 g of polyurethane resin, 50 g of fluorescent agent (prepared in Example 3), 60 g of dispersant (Solsperse-39000), 100 g of curing agent (Desmodur N3600), and 2000 g of xylene, and stir and mix evenly to obtain a fluorescent resin material; (2): Uniformly coat the fluorescent resin material on one side surface of the electrochromic film with a microgravure roll, and cure and form it to obtain a fluorescent layer with a thickness of 50 μm; (3): Coat an adhesive (prepared in Example 4) on the other side surface of the electrochromic film with a coating machine to form an adhesive layer with a thickness of 30 μm; (4): Compound the polyethylene release film with the adhesive layer, and wind it up to obtain a transparent display film.

[0027] Comparative Example 1 The raw material composition and process of the transparent display film are basically the same as those in Example 6, except that the fluorescent agent is replaced with a fluorescent agent of equal weight prepared by the following method: The preparation method of the fluorescent agent is basically the same as that in Example 2, except that 3-(3,5-ditert-butyl-4-hydroxyphenyl) propionyl hydrazide in step S1 is replaced with an equimolar amount of N-isopropyl-N-phenyl-p-phenylenediamine.

[0028] Comparative Example 2 The raw material composition and process of the transparent display film are basically the same as those in Example 6, except that the fluorescent agent is replaced with 20 g of modified fluorescent agent and 10 g of 3-(3,5-ditert-butyl-4-hydroxyphenyl) propionyl hydrazide.

[0029] The preparation method of the modified fluorescent agent is as follows: Add 500 ml of toluene, 0.14 mol of octadecanethiol, and 0.2 mol of anhydrous potassium carbonate to the reactor, stir at room temperature for 0.5 h, then add 0.1 mol of 4-bromo-1,8-naphthalic anhydride, heat up to 60 °C and react for 7 h, then carry out vacuum distillation at 60 °C for 2 h, and separate and purify by column chromatography (eluent ratio: petroleum ether / ethyl acetate = 5:1, silica gel 200-300 mesh) to obtain the fluorescent agent.

[0030] Comparative Example 3 The raw material composition and process of the transparent display film are basically the same as those in Example 6, except that the fluorescent agent is replaced with a fluorescent agent of equal weight prepared by the following method: The preparation method of the fluorescent agent is basically the same as that in Example 2, except that octadecanethiol in step S2 is replaced with an equimolar amount of n-octanethiol.

[0031] Comparative Example 4 The raw material composition and process of the transparent display film are basically the same as those in Example 6, except that the fluorescent agent is replaced with a hindered phenol compound prepared by step S1 of Example 2 of equal weight.

[0032] Comparative Example 5 The raw material composition and process of the transparent display film are basically the same as those in Example 6, except that the adhesive is replaced with an adhesive of equal weight prepared by the following method: The preparation method of the adhesive is basically the same as that in Example 4, except that dodecyl glycidyl ether in step A1 is replaced with an equal mass of octyl glycidyl ether.

[0033] Comparative Example 6 The raw material composition and process of the transparent display film are basically the same as those in Example 6, except that the adhesive is replaced with an adhesive of equal weight prepared by the following method: The preparation method of the adhesive is basically the same as that of Example 4, except that the dopamine hydrochloride in step A2 is replaced with 4-amino-2-hydroxymethyl-1-butanol of the same mass.

[0034] The electro-controlled dimming film layer used in the examples and comparative examples of this application has a thickness of 0.5 mm and is purchased from Beijing Wendis New Materials Technology Co., Ltd.; the polyethylene release film model is LPFM-G100, with a thickness of 0.15 mm, and is purchased from Nantong Lipeng New Materials Co., Ltd.; the polyurethane resin model is Leasys® 3979 produced by Wanhua Chemical (solid content 40 wt%); the molecular weight of sodium alginate is Mw = 2.85×10 5 ; the borax is pentahydrate borax.

[0035] The transparency of the transparent display film prepared in this application is adjusted through the electro-controlled dimming film. The electro-controlled dimming film is an intelligent light control material, and its principle is to use electromagnetic action and conduction effect to adjust the light flux and achieve controllable light transmittance. This technology is an existing technology; fluorescence display is achieved through the fluorescent layer.

[0036] The light transmittance of the optoelectronic mapping transparent display films prepared in Examples 5-7 and Comparative Examples 1-6 of this application, as well as the aged optoelectronic mapping transparent display films, was tested according to the method of GB / T 2410-2008 "Determination of Light Transmittance and Haze of Transparent Plastics". Aging method: carried out according to the method of GB / T 16422.3-2014 "Plastics - Methods of Exposure to Laboratory Light Sources".

[0037] The tensile strength of the optoelectronic mapping transparent display films prepared in Examples 5-7 and Comparative Examples 1-6 of this application was tested. The experimental method was based on the ASTM D638 standard, and the tensile speed was 50 mm / min.

[0038] The fluorescence brightness of the optoelectronic mapping transparent display films prepared in Examples 5-7 of this application was tested with a fluorescence brightness meter.

[0039] The self-healing performance of the transparent display films prepared in Examples 5-7 and the blank group (the adhesive used in the blank group is the low-odor acrylic adhesive DP8705NS) was tested. The test method is as follows: During the preparation of the transparent display film, after coating the 30-μm adhesive layer in step (3), a 10-μm-wide scratch was made with a scalpel. The scratch density was 1 scratch per centimeter longitudinally and 1 scratch per centimeter transversely. The scratch only penetrated the adhesive layer (without damaging the electro-control dimming film), and then it was laminated with a polyethylene release film to obtain the transparent display film. During the test, groups A and B were set for each example and the control group. For group A, after scratching, it was laminated with a polyethylene release film and the tensile strength was directly tested according to ASTM D638 standard. For group B, the tensile strength was tested according to ASTM D638 standard after being placed at 25 °C for 24 h. The self-healing rate performance data was expressed as the tensile strength of group A / the tensile strength of group B. The test results are shown in Table 1.

[0040] Table 1 Performance test table

[0041] As can be seen from Table 1, the optoelectronic mapping transparent display film prepared by the present invention has excellent transparency, tensile strength and self-healing performance.

[0042] The naphthalic anhydride derivative in the fluorescent agent prepared by the present invention provides a rigid conjugated structure, endows the fluorescent agent with high-efficiency light-emitting characteristics, and can enhance the light-emitting efficiency and color saturation of the display film. The hindered phenol structure, as an efficient free radical scavenger, can inhibit the oxidative degradation of the film material and extend the service life. The hydrophobic long chain of octadecanethiol improves the compatibility between the fluorescent agent and the polymer matrix, reduces phase separation, and ensures the uniform transparency of the film. The synergistic effect of long-chain thiols can reduce the aggregation of the fluorescent agent, ensure the uniform dispersion of the fluorescent agent in the film, and improve the light transmittance. The naphthalene ring and the hindered phenol synergistically absorb UV, reduce photodegradation, and prevent the film from yellowing or embrittling. The thioether bond and the long alkyl chain can improve the heat resistance of the material and reduce the possibility of molecular chain breakage at high temperatures.

[0043] The catechol group in the adhesive prepared by the present invention significantly improves the adhesion strength between the adhesive and the substrate through hydrogen bonding and π-π stacking interactions. The introduction of the dodecyl chain can enhance the compatibility with the hydrophobic display film substrate and reduce interface defects. Borax forms a dynamic borate ester bond with the hydroxyl groups of sodium alginate, endowing the adhesive with reversible cross-linking ability. When subjected to external force, energy is dissipated through bond breakage-recombination, improving the tensile performance.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. However, for those of ordinary skill in the art, without departing from the scope of the technical solution of the present invention, any minor changes, modifications, and equivalent variations made using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any changes, modifications, and equivalent variations made to the above embodiments based on the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function, characterized in that, It includes an electro - controlled dimming film layer, a fluorescent layer, an adhesive layer, and a release material layer; The fluorescent layer comprises raw materials in the following parts by weight: 80 - 100 parts of polyurethane resin, 2 - 5 parts of fluorescent agent, 3 - 6 parts of dispersant, 1 - 10 parts of curing agent, and 200 parts of solvent; The fluorescent agent is prepared by the following method: S1: 4 - bromo - 1,8 - naphthalic anhydride reacts with 3-(3,5 - di - tert - butyl - 4 - hydroxyphenyl)propionyl hydrazide to form a hindered phenol compound; S2: The hindered phenol compound reacts with octadecanethiol under the action of potassium carbonate to form a fluorescent agent.

2. The OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function according to claim 1, wherein In step S1, the molar ratio of 4 - bromo - 1,8 - naphthalic anhydride to 3-(3,5 - di - tert - butyl - 4 - hydroxyphenyl)propionyl hydrazide in the feed is 1:(2 - 2.5).

3. The OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function according to claim 1, characterized in that, In step S2, the molar ratio of the hindered phenol compound to octadecanethiol in the feed is 1:(1.2 - 1.5).

4. The OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function according to claim 1, characterized in that, The adhesive used in the adhesive layer is prepared by the following method: A1: Sodium alginate reacts with dodecyl glycidyl ether under the action of sodium hydroxide to form alkyl - modified sodium alginate; A2: Alkyl - modified sodium alginate reacts with dopamine hydrochloride to form dopamine - modified sodium alginate; A3: Dopamine - modified sodium alginate reacts with borax to form an adhesive.

5. An OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function according to claim 4, characterized in that, In step A1, the mass ratio of sodium alginate to dodecyl glycidyl ether in the feed is 3:

1.

6. The OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function according to claim 4, characterized in that, In step A2, the mass ratio of alkyl - modified sodium alginate to dopamine hydrochloride in the feed is 6:

1.

7. An OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function according to claim 4, characterized in that, In step A3, the mass ratio of dopamine - modified sodium alginate to borax in the feed is 5:

1.

8. The OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function according to claim 1, characterized in that, The release material layer is a polyethylene release film.

9. The OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function according to claim 1, characterized in that, The dispersant is one of Solsperse - 32500, Solsperse - 6000, Solsperse - 39000; the curing agent is one of Desmodur N3300, Desmodur N3390, Desmodur N3600; the solvent is xylene.

10. A method for preparing an OMTD optoelectronic mapping transparent display film with a light transmittance adjustment function according to any one of claims 1-9, characterized in that, It includes the following steps: (1): Weigh by parts by weight: 80 - 100 parts of polyurethane resin, 2 - 5 parts of fluorescent agent, 3 - 6 parts of dispersant, 1 - 10 parts of curing agent, and 200 parts of solvent; stir and mix evenly to obtain a fluorescent resin material; (2): Uniformly coat the fluorescent resin material on one side surface of the electro - controlled dimming film layer with a micro - gravure roll and cure it to form a fluorescent layer; (3): Coat an adhesive on the other side surface of the electro - controlled dimming film layer to obtain an adhesive layer; (4): Compound the release film layer with the adhesive layer, wind it up, and obtain a transparent display film.

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