Zinc sulfide coating material and optical film prepared from same

Abstract

The invention relates to the field of optical films, in particular to a zinc sulfide coating material and an optical film prepared from the same. Comprising the following steps: the zinc sulfide coating material comprises nano molybdenum-doped zinc sulfide; the preparation method comprises the following steps: 1, sequentially adding zinc salt, molybdenum salt, thiourea, diethanol amine and 3, 6-diaminocarbazole into ethylene glycol, and uniformly mixing to obtain a reaction solution; and 2, carrying out a solvothermal reaction on the reaction solution at 120-150 DEG C in a nitrogen atmosphere for 5-10 hours, washing, and drying to obtain the nano molybdenum-doped zinc sulfide. According to the scheme, molybdenum-doped zinc sulfide is utilized, and the magnetic effect is enhanced under the condition that molybdenum doping does not change the crystal form of the molybdenum-doped zinc sulfide; therefore, in the optical film preparation process, the orderliness of the zinc sulfide crystal face is improved through the arrangement of the magnetic field, and the transparency of the optical film is improved.

Description

Technical Field

[0001] The invention relates to the technical field of optical films, in particular to a zinc sulfide coating material and an optical film prepared therefrom. Background Art

[0002] With the advancement of science and technology, optical film materials are increasingly used in display technology, optical devices, solar cells and other fields. At present, optical film materials mainly include oxide coatings and sulfide coatings, and the performance of optical film materials directly affects the product's optical properties and energy efficiency such as transmittance, refractive index, fluorescence, etc. Among them, zinc sulfide has been widely studied due to its excellent optical properties such as high refractive index, good chemical stability and thermal stability.

[0003] In common processes, the optical film formed by zinc sulfide coating materials is generally a pure inorganic layer; there are problems such as excessive stress and low adhesion; the use of organic-inorganic hybrid optical films can effectively solve the above problems. However, the organic-inorganic optical film formed by zinc sulfide coating materials has interface problems such as compatibility and dispersion uniformity, which will affect the overall optical performance; secondly, there is a problem of excessive refractive index difference between organic materials and inorganic materials zinc sulfide, which will reduce the overall light transmittance.

[0004] In summary, solving the above problems and preparing an optical film with high refraction and high transmittance based on zinc sulfide coating materials has important application significance. Summary of the invention

[0005] The object of the present invention is to provide a zinc sulfide coating material and an optical film prepared therefrom, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A zinc sulfide coating material, the zinc sulfide coating material comprises nano-molybdenum-doped zinc sulfide; and a preparation method thereof comprises the following steps:

[0008] Step 1: zinc salt, molybdenum salt, thiourea, diethanolamine, and 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution;

[0009] Step 2: subjecting the reaction solution to a solvent thermal reaction at 120-150° C. for 5-10 hours under a nitrogen atmosphere, washing and drying to obtain nano-molybdenum-doped zinc sulfide.

[0010] More optimally, in the raw material of molybdenum-doped zinc sulfide, the molybdenum salt accounts for 4 to 6 at% of the zinc salt.

[0011] More optimally, the reaction solution includes the following components: 0.5-1 mol / L zinc salt, 0.5-1 mol / L thiourea, 20-35 mL / L diethanolamine, 0.1-0.15 g / L 3,6-diaminocarbazole, and the solvent is ethylene glycol.

[0012] In a further embodiment, an optical film prepared from a zinc sulfide coating material, the preparation process of the optical film comprises the following steps:

[0013] Step 1: adding the nano-molybdenum doped zinc sulfide, polyol, diisocyanate, and catalyst to N,N-dimethylformamide in sequence and stirring evenly to obtain a mixed solution;

[0014] Step 2: Spin-coat the mixed solution on the optical device and semi-cure it at 50-60°C for 0.5-1 hour; then apply a static magnetic field of 300-350 mT and continue drying at 60-80°C for 4-5 hours to obtain an optical film.

[0015] More optimally, the optical film comprises the following components: by weight, 6 to 8 parts of nano-molybdenum-doped zinc sulfide, 20 to 25 parts of diisocyanate, 12 to 15 parts of polyol, 0.05 to 0.08 parts of catalyst, and 120 to 150 parts of N,N-dimethylformamide.

[0016] More optimally, the diisocyanate includes one or two of toluene diisocyanate and isophorone diisocyanate; the polyol includes pentaerythritol, ethylene glycol and carbazole diol in a mass ratio of 1:8 to 10:3 to 4.

[0017] More optimally, the preparation method of carbazole diol comprises the following steps:

[0018] S1-1: 3,6-diaminocarbazole and 2-methylacrolein are added to ethanol in sequence and stirred evenly; the temperature is raised to 60-65° C. and heated for 4-5 hours, and purified to obtain diene carbazole;

[0019] S1-2: Dienylcarbazole, 2-mercaptoethanol and photoinitiator are added to tetrahydrofuran in sequence at 100-120 mW / cm 2 The light intensity was high, and the carbazole diol was obtained by UV light clicking at room temperature for 2 to 3 hours.

[0020] More optimally, the mass ratio of the 3,6-diaminocarbazole to 2-methylacrolein is 1:0.71-0.72; the mass ratio of the dienylcarbazole to 2-mercaptoethanol is 1:0.46-0.48.

[0021] More optimally, the nano-molybdenum doped zinc sulfide is pre-modified and then used to prepare the optical film, and the modification process includes the following steps:

[0022] S2-1: Dienylcarbazole, cysteamine, and photoinitiator are added to tetrahydrofuran in sequence at 100-120 mW / cm 2 The light intensity is 200 nm, and the mixture is subjected to ultraviolet light clicking at room temperature for 2 to 3 hours, and purified to obtain carbazole diamine; wherein the mass ratio of dienyl carbazole to cysteamine is 1:0.46 to 0.48;

[0023] S2-2: Add nano-molybdenum-doped zinc sulfide to Tir-buffered solution and ultrasonically disperse for 10 to 15 minutes, then add dopamine, catechol, carbazole diamine, and tetraethylene pentamine and ultrasonically disperse for 10 to 15 minutes; at 100 to 120 μW / cm 2 The mixture is stirred for 1 to 1.5 hours under a light intensity of , and then washed, filtered and dried to obtain modified nano-molybdenum-doped zinc sulfide.

[0024] More optimally, the raw materials of the modified nano-molybdenum doped zinc sulfide include the following raw materials: by weight, 6 to 8 parts of nano-molybdenum doped zinc sulfide, 5.5 to 6 parts of dopamine, 4 to 4.5 parts of catechol, 1.2 to 1.5 parts of carbazole diamine, 1.5 to 1.8 parts of tetraethylene pentamine, and 500 parts of Tir-buffer solution.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) Using molybdenum-doped zinc sulfide nanomaterials as zinc sulfide coating materials; using molybdenum doping to improve the magnetic effect of nano-molybdenum-doped zinc sulfide; thereby promoting the orderliness of the material in the subsequent coating, reducing internal scattering, and thus improving the optical performance. Among them, the nano-molybdenum-doped zinc sulfide prepared in the scheme is a cubic phase, which has lower internal scattering and better transmittance than the hexagonal phase; at the same time, molybdenum doping will not change the cubic phase of the main zinc sulfide lattice, but due to its doping, the zinc sulfide band gap changes, thereby affecting its optical properties, and the amount of molybdenum introduced needs to be limited; excessive molybdenum doping will introduce defects in the zinc sulfide lattice, so that the defects act as scattering centers and affect the light transmittance.

[0027] In the scheme (2), nano-molybdenum doped zinc sulfide is used as the zinc sulfide coating material, and organic matter is used as an auxiliary to prepare an inorganic-organic hybrid optical film. On the one hand, in order to solve the interface problems such as compatibility and dispersibility; first, the nano-molybdenum doped zinc sulfide is further modified; second, during the drying and curing process, a magnetic field is set to improve its order in the optical film, thereby effectively enhancing the optical properties of the optical film. On the other hand, in order to reduce the refractive index difference between inorganic materials and organic matter, carbazole groups are introduced into the organic matter, which effectively enhances the refractive index of the organic matter while improving its mechanical strength.

[0028] Among them, the amino group in 3,6-diaminocarbazole is reacted with the aldehyde group to graft 2-methylacrolein to obtain dienyl carbazole; the alkenyl group and the thiol group are used to react with 2-mercaptoethanol and cysteamine respectively by ultraviolet light click reaction to obtain carbazole diol and carbazole diamine; they are introduced into the polyurethane chain segment and the chain segment of the surface coating layer of the modified nano-molybdenum-doped zinc sulfide, respectively, so that the two have similar compatibility, improve the dispersibility and interface, and increase the comprehensive performance of the optical film. At the same time, the carbazole and thiol groups contained in the carbazole diamine increase the refractive index of the polyurethane, reduce the refractive difference between it and the nano-molybdenum-doped zinc sulfide, thereby improving the light transmittance; and the introduction of the chain break effectively increases the mechanical properties and wear resistance of the optical film.

[0029] Among them, nano-molybdenum doped zinc sulfide is made of dopamine, catechol, carbazole diamine, and tetraethylenepentamine as raw materials. Under ultraviolet light, it forms intermolecular crosslinks through Michale addition and Schiff base reaction, thereby coating the surface of nano-molybdenum doped zinc sulfide to increase its interface with polyurethane. Ultraviolet light increases the uniformity of coating. It should be noted that the amount of carbazole diamine introduced should not be too much. Too much introduction will affect the surface coating density, resulting in uneven coating, increasing internal scattering and affecting light transmittance.

[0030] Among them, the presence of a magnetic field can improve the dispersion uniformity of nano-molybdenum-doped zinc sulfide in the optical film, thereby reducing defects and stress, improving the uniformity of the optical film, thereby reducing light scattering caused by unevenness, and effectively improving the transmittance of the optical film. DETAILED DESCRIPTION

[0031] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0032] It should be noted that the following parts are parts by mass; all raw materials involved in the present invention are purchased from manufacturers without any special restrictions, and illustratively include: the CAS number of 3,6-diaminocarbazole is 86-71-5, the CAS number of 2-methylacrolein is 78-85-3, the zinc salt is zinc sulfate hexahydrate, the molybdenum salt is ammonium molybdate tetrahydrate, and the pH of the Tir-buffer solution is 9.5.

[0033] The preparation method of diene carbazole is as follows: 10 parts of 3,6-diaminocarbazole and 7.15 parts of 2-methylacrolein are sequentially added into 100 parts of ethanol and stirred evenly; the temperature is raised to 60° C. and heated for 4 hours, and purified to obtain diene carbazole.

[0034] The preparation method of carbazole diol is as follows: 10 parts of diene carbazole, 4.8 parts of 2-mercaptoethanol, and 0.05 parts of photoinitiator AIBN are added to 100 parts of tetrahydrofuran in sequence, and the reaction mixture is heated at 100 mW / cm 2The light intensity was 0.04, and the mixture was irradiated with UV light at room temperature for 2 hours for purification to obtain carbazole diol.

[0035] The preparation method of carbazole diamine is as follows: 10 parts of diene carbazole, 4.7 parts of cysteamine, and 0.05 parts of photoinitiator AIBN are added to 100 parts of tetrahydrofuran in sequence, and the reaction mixture is heated at 120 mW / cm 2 The light intensity was 0.04, and it was exposed to UV light at room temperature for 2 hours for purification to obtain carbazole diamine.

[0036] Embodiment 1: An optical film prepared from a zinc sulfide coating material, comprising the following steps:

[0037] Step 1: 1 mol / L zinc salt, 0.05 mol / L molybdenum salt, 1 mol / L thiourea, 30 mL / L diethanolamine, and 0.12 g / L 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution; the reaction solution is subjected to a solvent thermal reaction at 150° C. for 5 hours under a nitrogen atmosphere, washed, and dried to obtain nano-molybdenum-doped zinc sulfide;

[0038] Step 2: (1) 7 parts of nano-molybdenum-doped zinc sulfide were added to 500 parts of Tir-buffered solution and ultrasonically dispersed for 10 minutes, and 6 parts of dopamine, 4.5 parts of catechol, 1.4 parts of carbazole diamine, and 1.6 parts of tetraethylene pentamine were added in sequence and ultrasonically dispersed for 15 minutes; 2 The mixture was stirred for 1 hour under a light intensity of , washed, filtered and dried to obtain modified nano-molybdenum-doped zinc sulfide;

[0039] (2) adding the modified nano-molybdenum doped zinc sulfide, 15 parts of polyol (pentaerythritol, ethylene glycol and carbazole diol in a mass ratio of 1:10:4), 24 parts of 2,4-toluene diisocyanate, and 0.05 parts of dibutyltin dilaurate to 150 parts of N,N-dimethylformamide in sequence and stirring evenly to obtain a mixed solution;

[0040] Step 3: Spin-coat the mixed solution on a glass substrate and semi-cure at 50°C for 0.5 hours; then apply a static magnetic field of 350 mT and continue drying at 80°C for 5 hours to obtain an optical film.

[0041] Embodiment 2: An optical film prepared from a zinc sulfide coating material, comprising the following steps:

[0042] Step 1: 1 mol / L zinc salt, 0.05 mol / L molybdenum salt, 1 mol / L thiourea, 30 mL / L diethanolamine, and 0.12 g / L 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution; the reaction solution is subjected to a solvent thermal reaction at 150° C. for 5 hours under a nitrogen atmosphere, washed, and dried to obtain nano-molybdenum-doped zinc sulfide;

[0043] Step 2: (1) 6 parts of nano-molybdenum-doped zinc sulfide were added to 500 parts of Tir-buffered solution and ultrasonically dispersed for 10 minutes, and 5.5 parts of dopamine, 4 parts of catechol, 1.2 parts of carbazole diamine, and 1.5 parts of tetraethylene pentamine were added in sequence and ultrasonically dispersed for 15 minutes; 2 The mixture was stirred for 1 hour under a light intensity of , washed, filtered and dried to obtain modified nano-molybdenum-doped zinc sulfide;

[0044] (2) adding the modified nano-molybdenum doped zinc sulfide, 12 parts of polyol (pentaerythritol, ethylene glycol and carbazole diol in a mass ratio of 1:8:3), 20 parts of 2,4-toluene diisocyanate, and 0.05 parts of dibutyltin dilaurate to 120 parts of N,N-dimethylformamide in sequence and stirring evenly to obtain a mixed solution;

[0045] Step 3: Spin-coat the mixed solution on a glass substrate and semi-cure at 50° C. for 0.5 hours; then apply a static magnetic field of 300 mT and continue drying at 80° C. for 5 hours to obtain an optical film.

[0046] Embodiment 3: An optical film prepared from a zinc sulfide coating material, comprising the following steps:

[0047] Step 1: 1 mol / L zinc salt, 0.05 mol / L molybdenum salt, 1 mol / L thiourea, 30 mL / L diethanolamine, and 0.12 g / L 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution; the reaction solution is subjected to a solvent thermal reaction at 150° C. for 5 hours under a nitrogen atmosphere, washed, and dried to obtain nano-molybdenum-doped zinc sulfide;

[0048] Step 2: (1) 8 parts of nano-molybdenum-doped zinc sulfide were added to 500 parts of Tir-buffered solution and ultrasonically dispersed for 10 minutes, and 6 parts of dopamine, 4.5 parts of catechol, 1.5 parts of carbazole diamine, and 1.8 parts of tetraethylene pentamine were added in sequence and ultrasonically dispersed for 15 minutes; 2 The mixture was stirred for 1 hour under a light intensity of , washed, filtered and dried to obtain modified nano-molybdenum-doped zinc sulfide;

[0049] (2) adding the modified nano-molybdenum doped zinc sulfide, 14 parts of polyol (pentaerythritol, ethylene glycol and carbazole diol in a mass ratio of 1:10:3), 25 parts of 2,4-toluene diisocyanate, and 0.05 parts of dibutyltin dilaurate to 150 parts of N,N-dimethylformamide in sequence and stirring evenly to obtain a mixed solution;

[0050] Step 3: Spin-coat the mixed solution on a glass substrate and semi-cure at 50° C. for 0.5 hours; then apply a static magnetic field of 300 mT and continue drying at 80° C. for 5 hours to obtain an optical film.

[0051] Comparative Example 1: Taking Example 1 as a reference, the nano-molybdenum-doped zinc sulfide is not modified, and the rest is the same as Example 1;

[0052] Step 1: 1 mol / L zinc salt, 0.05 mol / L molybdenum salt, 1 mol / L thiourea, 30 mL / L diethanolamine, and 0.12 g / L 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution; the reaction solution is subjected to a solvent thermal reaction at 150° C. for 5 hours under a nitrogen atmosphere, washed, and dried to obtain nano-molybdenum-doped zinc sulfide;

[0053] (2) 7 parts of nano-molybdenum-doped zinc sulfide, 15 parts of polyol (pentaerythritol, ethylene glycol and carbazole diol in a mass ratio of 1:10:4), 24 parts of 2,4-toluene diisocyanate, and 0.05 parts of dibutyltin dilaurate were sequentially added to 150 parts of N,N-dimethylformamide and stirred to obtain a mixed solution;

[0054] Step 3: Spin-coat the mixed solution on a glass substrate and semi-cure at 50°C for 0.5 hours; then apply a static magnetic field of 350 mT and continue drying at 80°C for 5 hours to obtain an optical film.

[0055] Comparative Example 2: Taking Comparative Example 1 as a reference, the nano-molybdenum-doped zinc sulfide is not doped with molybdenum, and no magnetic field is set; the rest is the same as Comparative Example 1;

[0056] Step 1: 1 mol / L zinc salt, 1 mol / L thiourea, 30 mL / L diethanolamine, and 0.12 g / L 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution; the reaction solution is subjected to a solvent thermal reaction at 150° C. for 5 hours under a nitrogen atmosphere, and then washed and dried to obtain nano-molybdenum-doped zinc sulfide;

[0057] (2) 7 parts of nano-molybdenum-doped zinc sulfide, 15 parts of polyol (pentaerythritol, ethylene glycol and carbazole diol in a mass ratio of 1:10:4), 24 parts of 2,4-toluene diisocyanate, and 0.05 parts of dibutyltin dilaurate were sequentially added to 150 parts of N,N-dimethylformamide and stirred to obtain a mixed solution;

[0058] Step 3: Spin-coat the mixed solution on a glass substrate and semi-cure at 50°C for 0.5 hours; then apply a static magnetic field of 350 mT and continue drying at 80°C for 5 hours to obtain an optical film.

[0059] Comparative Example 3: Taking Comparative Example 1 as a reference, the content of molybdenum in the nano-molybdenum-doped zinc sulfide was increased; the rest was the same as Comparative Example 1;

[0060] Step 1: 1 mol / L zinc salt, 0.1 mol / L molybdenum salt, 1 mol / L thiourea, 30 mL / L diethanolamine, and 0.12 g / L 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution; the reaction solution is subjected to a solvent thermal reaction at 150° C. for 5 hours under a nitrogen atmosphere, washed, and dried to obtain nano-molybdenum-doped zinc sulfide;

[0061] (2) 7 parts of nano-molybdenum-doped zinc sulfide, 15 parts of polyol (pentaerythritol, ethylene glycol and carbazole diol in a mass ratio of 1:10:4), 24 parts of 2,4-toluene diisocyanate, and 0.05 parts of dibutyltin dilaurate were sequentially added to 150 parts of N,N-dimethylformamide and stirred to obtain a mixed solution;

[0062] Step 3: Spin-coat the mixed solution on a glass substrate and semi-cure at 50°C for 0.5 hours; then apply a static magnetic field of 350 mT and continue drying at 80°C for 5 hours to obtain an optical film.

[0063] Comparative Example 4: Example 1 is used as a reference, but carbazole diol is not introduced; the rest is the same as Comparative Example 1;

[0064] Step 1: 1 mol / L zinc salt, 0.05 mol / L molybdenum salt, 1 mol / L thiourea, 30 mL / L diethanolamine, and 0.12 g / L 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution; the reaction solution is subjected to a solvent thermal reaction at 150° C. for 5 hours under a nitrogen atmosphere, washed, and dried to obtain nano-molybdenum-doped zinc sulfide;

[0065] Step 2: (1) 7 parts of nano-molybdenum-doped zinc sulfide were added to 500 parts of Tir-buffered solution and ultrasonically dispersed for 10 minutes, and 6 parts of dopamine, 4.5 parts of catechol, 1.4 parts of carbazole diamine, and 1.6 parts of tetraethylene pentamine were added in sequence and ultrasonically dispersed for 15 minutes; 2 The mixture was stirred for 1 hour under a light intensity of , washed, filtered and dried to obtain modified nano-molybdenum-doped zinc sulfide;

[0066] (2) adding the modified nano-molybdenum doped zinc sulfide, 15 parts of polyol (mass ratio of pentaerythritol to ethylene glycol is 1:14), 24 parts of 2,4-toluene diisocyanate, and 0.05 parts of dibutyltin dilaurate to 150 parts of N,N-dimethylformamide in sequence and stirring evenly to obtain a mixed solution;

[0067] Step 3: Spin-coat the mixed solution on a glass substrate and semi-cure at 50°C for 0.5 hours; then apply a static magnetic field of 350 mT and continue drying at 80°C for 5 hours to obtain an optical film.

[0068] Comparative Example 5: Taking Example 1 as a reference, 3,6-diaminocarbazole was used to replace carbazole diamine and carbazole diol; the rest was the same as Comparative Example 1;

[0069] Step 1: 1 mol / L zinc salt, 0.05 mol / L molybdenum salt, 1 mol / L thiourea, 30 mL / L diethanolamine, and 0.12 g / L 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution; the reaction solution is subjected to a solvent thermal reaction at 150° C. for 5 hours under a nitrogen atmosphere, washed, and dried to obtain nano-molybdenum-doped zinc sulfide;

[0070] Step 2: (1) 7 parts of nano-molybdenum-doped zinc sulfide were added to 500 parts of Tir-buffered solution and ultrasonically dispersed for 10 minutes, and 6 parts of dopamine, 4.5 parts of catechol, 1.4 parts of 3,6-diaminocarbazole, and 1.6 parts of tetraethylenepentamine were added in sequence and ultrasonically dispersed for 15 minutes; 2 The mixture was stirred for 1 hour under a light intensity of , washed, filtered and dried to obtain modified nano-molybdenum-doped zinc sulfide;

[0071] (2) adding the modified nano-molybdenum doped zinc sulfide, 15 parts of polyol (pentaerythritol, ethylene glycol and 3,6-diaminocarbazole in a mass ratio of 1:10:4), 24 parts of 2,4-toluene diisocyanate, and 0.05 parts of dibutyltin dilaurate to 150 parts of N,N-dimethylformamide in sequence and stirring evenly to obtain a mixed solution;

[0072] Step 3: Spin-coat the mixed solution on a glass substrate and semi-cure at 50°C for 0.5 hours; then apply a static magnetic field of 350 mT and continue drying at 80°C for 5 hours to obtain an optical film.

[0073] Performance test: The prepared optical film was subjected to performance testing; the thickness of the optical film was 500nm; an ellipsometer was used to test the refractive index at a wavelength of 625nm; a transmittance meter was used to test its transmittance; the obtained data are shown in the following table:

[0074] sample Refractive Index Transmittance % Example 1 1.67 93.7 Example 2 1.66 92.3 Example 3 1.66 92.8 Comparative Example 1 1.64 87.4 Comparative Example 2 1.62 83.5 Comparative Example 3 1.61 84.3 Comparative Example 4 1.65 89.5 Comparative Example 5 1.65 90.3

[0075] Conclusion: From the data in the above table, it can be seen that in this application, nano-molybdenum doped zinc sulfide is used as the coating material, and by modifying it and combining it with polyurethane material to form an organic-inorganic hybrid optical film, the transmittance and refractive index of the optical film are effectively enhanced. From the data of comparative examples 1 to 5, it can be seen that: compared with Example 1, Comparative Example 1 does not modify the nano-molybdenum doped zinc sulfide, which reduces its interface performance and reduces the optical performance; Comparative Example 2 compared to Comparative Example 1, due to the lack of molybdenum doping, it reduces its order in the optical film, resulting in a decrease in optical performance; Comparative Example 3 compared to Comparative Example 1, due to excessive introduction of molybdenum, the lattice defects increase, resulting in a decrease in optical performance; Comparative Example 4 compared to Example 1, due to the lack of introduction of carbazole diol, the interface between the inorganic material and the polyurethane is reduced, the refractive index difference between the two is increased, and the transmittance is reduced; Comparative Example 5 compared to Example 1, due to the use of 3,6-diaminocarbazole to replace carbazole diamine and carbazole diol, the refractive index is reduced.

[0076] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A zinc sulfide coating material, Features: The zinc sulfide coating material comprises nano-molybdenum-doped zinc sulfide; and its preparation method comprises the following steps: Step 1: zinc salt, molybdenum salt, thiourea, diethanolamine, and 3,6-diaminocarbazole are sequentially added to ethylene glycol and mixed evenly to obtain a reaction solution; Step 2: subjecting the reaction solution to a solvent thermal reaction at 120-150° C. for 5-10 hours under a nitrogen atmosphere, washing and drying to obtain nano-molybdenum-doped zinc sulfide.

2. A zinc sulfide coating material according to claim 1, Features: In the raw material of molybdenum-doped zinc sulfide, the molybdenum salt accounts for 4-6 at% of the zinc salt.

3. A zinc sulfide coating material according to claim 1, Features: The reaction solution comprises the following components: 0.5-1 mol / L zinc salt, 0.5-1 mol / L thiourea, 20-35 mL / L diethanolamine, 0.1-0.15 g / L 3,6-diaminocarbazole, and the solvent is ethylene glycol.

4. An optical film prepared from a zinc sulfide coating material, Features: The preparation process of the optical film comprises the following steps: Step 1: Add the nano-molybdenum doped zinc sulfide, polyol, diisocyanate and catalyst described in claim 1 to N,N-dimethylformamide in sequence and stir evenly to obtain a mixed solution; Step 2: Spin-coat the mixed solution on the optical device and semi-cure it at 50-60°C for 0.5-1 hour; then apply a static magnetic field of 300-350 mT and continue drying at 60-80°C for 4-5 hours to obtain an optical film.

5. An optical film prepared from a zinc sulfide coating material according to claim 4, Features: The optical film comprises the following components: by weight, 6 to 8 parts of nano-molybdenum-doped zinc sulfide, 20 to 25 parts of diisocyanate, 12 to 15 parts of polyol, 0.05 to 0.08 parts of catalyst, and 120 to 150 parts of N,N-dimethylformamide.

6. An optical film prepared from a zinc sulfide coating material according to claim 4, Features: The diisocyanate comprises one or two of toluene diisocyanate and isophorone diisocyanate; the polyol comprises pentaerythritol, ethylene glycol and carbazole diol in a mass ratio of 1:8-10:3-4.

7. An optical film prepared from a zinc sulfide coating material according to claim 6, Features: The preparation method of the carbazole diol comprises the following steps: S1-1: 3,6-diaminocarbazole and 2-methylacrolein are added to ethanol in sequence and stirred evenly; the temperature is raised to 60-65° C. and heated for 4-5 hours, and purified to obtain diene carbazole; S1-2: Dienylcarbazole, 2-mercaptoethanol and photoinitiator are added to tetrahydrofuran in sequence at 100-120 mW / cm 2 The light intensity was high, and the carbazole diol was obtained by UV light clicking at room temperature for 2 to 3 hours for purification.

8. An optical film prepared from the zinc sulfide coating material according to claim 7, Features: The mass ratio of the 3,6-diaminocarbazole to 2-methylacrolein is 1:0.71-0.72; the mass ratio of the dienecarbazole to 2-mercaptoethanol is 1:0.46-0.

48.

9. An optical film prepared from a zinc sulfide coating material according to claim 4, Features: The nano-molybdenum doped zinc sulfide is pre-modified and then used to prepare the optical film, and the modification process includes the following steps: S2-1: Dienylcarbazole, cysteamine, and photoinitiator are added to tetrahydrofuran in sequence at 100-120 mW / cm 2 The light intensity is 200 nm, and the mixture is subjected to ultraviolet light clicking at room temperature for 2 to 3 hours, and purified to obtain carbazole diamine; wherein the mass ratio of dienyl carbazole to cysteamine is 1:0.46 to 0.48; S2-2: Add nano-molybdenum-doped zinc sulfide to Tir-buffered solution and ultrasonically disperse for 10 to 15 minutes, then add dopamine, catechol, carbazole diamine, and tetraethylene pentamine and ultrasonically disperse for 10 to 15 minutes; at 100 to 120 μW / cm 2 The mixture is stirred for 1 to 1.5 hours under a light intensity of , and then washed, filtered and dried to obtain modified nano-molybdenum-doped zinc sulfide.

10. An optical film made of the zinc sulfide coating material according to claim 9, Features: The raw materials of the modified nano-molybdenum doped zinc sulfide include the following raw materials: by weight, 6-8 parts of nano-molybdenum doped zinc sulfide, 5.5-6 parts of dopamine, 4-4.5 parts of catechol, 1.2-1.5 parts of carbazole diamine, 1.5-1.8 parts of tetraethylene pentamine, and 500 parts of Tir-buffer solution.