LAD single-layer high-color-gamut diffusion plate and preparation method thereof

Abstract

The invention discloses an LAD single-layer high-color-gamut diffusion plate and a preparation method thereof, and relates to the technical field of diffusion plate materials. According to the LAD single-layer high-color-gamut diffusion plate, a self-made absorbent, a diffusant and quantum dots are granulated with polystyrene and then mixed, the mixture is placed in a single-screw extruder to be extruded, a light absorption agent is prepared through the reaction of 1, 3-bis (diphenylphosphine) propane, copper chloride and perfluorooctanoic acid, and the ionic complex type light absorption agent has the advantages that the light absorption effect is good; the composite material can be used for high-temperature processing technologies such as direct injection and extrusion of engineering plastics such as PC (polycarbonate) and PMMA (polymethyl methacrylate), is low in skin irritation and extremely low in possibility of harm to a human body, and effectively reduces potential safety hazards caused in the processes of processing, operating or carrying and the like.

Description

Technical Field

[0001] This invention relates to the field of diffusion plate material technology, specifically to a single-layer high color gamut LAD diffusion plate and its preparation method. Background Technology

[0002] A diffuser plate utilizes the continuous refraction, reflection, and scattering of light between chemical particles and resin. While blocking the light source and eliminating glare, it allows the light to emit uniform, soft, and aesthetically pleasing light, achieving a comfortable effect of translucency without opacity. Compared to traditional CCFL backlights, LED backlights offer numerous advantages, including high color gamut, high brightness, long lifespan, energy efficiency, and real-time color control. High color gamut LED backlights result in more vibrant colors and higher color fidelity in the screens of electronic products such as televisions, mobile phones, and tablets. To achieve more perfect, richer, and more realistic colors in displays, researchers are constantly striving to improve the color gamut value of LED backlit displays.

[0003] Existing diffuser plates are often produced using a three-layer co-extrusion process, which involves a single-screw main extruder and two auxiliary extruders, with a three-layer in-mold composite die. The mixture is then fed into the extruder through an automatic feeding system. However, compared to LAD single-layer high color gamut diffuser plates, their performance still needs improvement. Therefore, this invention studies and prepares an LAD single-layer high color gamut diffuser plate. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a single-layer high color gamut diffusion plate for LAD and its preparation method.

[0005] The present invention proposes a technical solution to solve the above-mentioned technical problems: a single-layer high color gamut diffuser plate for laser light diffusion, comprising the following raw materials by mass percentage: 0.8-2% light diffusing agent, 0.0003-0.0005% light absorber, 0-2.5% quantum dots, and the remainder being polystyrene; wherein the light diffusing agent is silicon dioxide; the light absorber is copper ion compound powder, and the absorption peak of the light absorber is 450-590 nm; and the quantum dots are all-solid-state perovskite quantum dots.

[0006] Preferably, the LAD single-layer high color gamut diffuser plate is produced by mixing a light diffuser and quantum dots with polystyrene, granulating the mixture, mixing it with a light absorber, and then extruding it using a single-screw extruder.

[0007] Preferably, the light absorber is prepared by reacting 1,3-bis(diphenylphosphine)propane, copper chloride and perfluorooctanoic acid, and the absorption peak of the light absorber is 580~590nm.

[0008] Preferably, the light absorber is prepared by mixing copper chloride, sodium perfluorooctanoate, and dichloromethane in a mass ratio of 0.38:0.85~0.88:4~8, adding 3~4 times the mass of 1,3-bis(diphenylphosphine)propane, reacting at room temperature at 200~400 rpm for 24~36 h, allowing the mixture to stand and separate into layers, filtering, and then performing column chromatography with petroleum ether and ethyl acetate in a volume ratio of 1:1. The mixture is then dried with anhydrous sodium sulfate and rotary evaporated to obtain the light absorber.

[0009] Preferably, the light absorber is a purplish-red powder with a melting point greater than 300°C, a solubility of 5 g / L in dichloromethane, a solubility of 0.3 g / L in acetone, and a solubility of 0.5 g / L in cyclohexane.

[0010] Preferably, the all-solid-state perovskite quantum dots include red-light perovskite quantum dots and green-light perovskite quantum dots in a mass ratio of 1:8~12; the emission wavelength of the red-light perovskite quantum dots is 630~635 nm and the full width at half maximum (FWHM) of the red-light perovskite quantum dots is 30 nm, the emission wavelength of the green-light perovskite quantum dots is 520~525 nm and the FWHM of the red-light perovskite quantum dots is 19 nm.

[0011] Preferably, the method for preparing the LAD single-layer high color gamut diffuser plate is as follows: the light diffuser, light absorber, and quantum dots are mixed with polystyrene and granulated, then mixed and placed in a single-screw extruder, premixed at 600~900rpm for 3~5min, transferred to a single-screw extruder, and vacuum extruded to obtain the LAD single-layer high color gamut diffuser plate.

[0012] Preferably, during the vacuum extrusion process, the vacuum is applied to 0.006~0.008MPa, the feed section temperature is 200~220℃, the melting section temperature is 220~240℃, the metering section temperature is 230~260℃, the screw speed is 200~300rpm, the die temperature is 230~250℃, the melt pressure is 10~20MPa, the die gap is 0.6~1.2mm, and the draw ratio is 1.01~1.05.

[0013] Preferably, the thickness of the LAD single-layer high color gamut diffusion plate is 1.8~2mm.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are: The LAD single-layer high color gamut diffuser plate of this invention is produced by mixing absorbent, diffuser, and quantum dots with polystyrene granules, followed by extrusion using a single-screw extruder. The absorbent is prepared by reacting 1,3-bis(diphenylphosphine)propane, copper chloride, and perfluorooctanoic acid. This ionic complex absorbent can be used in high-temperature processing processes such as direct injection molding and extrusion of engineering plastics like PC and PMMA. It has low skin irritation and a very low potential for harm to the human body, effectively reducing safety hazards during processing, handling, or transportation. Furthermore, adding a low concentration of absorbent to the single-layer diffuser plate ensures uniform dispersion, consistent FOS image, higher brightness than composite plates, and stable and controllable Delta value in the 585nm spectrum. It also fully utilizes existing extrusion production lines, effectively guaranteeing production capacity. Attached Figure Description

[0015] Figure 1 The image shows the spectrum of the LAD monolayer high color gamut diffuser prepared in Example 3.

[0016] Figure 2 The LAD single-layer high color gamut diffusion plate structure prepared for the example.

[0017] Figure 3 The LAD composite diffuser plate structure prepared in the comparative example is shown. A is the high-haze diffuser layer, B is the quantum dot layer, and C is the light absorber layer.

[0018] Figure 4 The absorption spectrum of the absorber prepared in Example 3 is shown. Detailed Implementation

[0019] The present invention will be specifically described below through embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above description. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those skilled in the art.

[0020] Example 1 In this embodiment, the thickness of the LAD single-layer high color gamut diffuser plate is 1.8 mm, comprising the following components by mass percentage: 0.8% light-diffusing agent silicon dioxide, 0.0003% light-absorbing agent with an absorption peak of 450 nm, and the remainder being polystyrene; the all-solid-state perovskite quantum dots include red perovskite quantum dots and green perovskite quantum dots in a mass ratio of 1:8; the emission wavelength of the red perovskite quantum dots is 630 nm, and the full width at half maximum (FWHM) of the red perovskite quantum dots is 30 nm; the emission wavelength of the green perovskite quantum dots is 520 nm, and the FWHM of the red perovskite quantum dots is 19 nm.

[0021] The method for preparing the LAD single-layer high color gamut diffuser plate in this embodiment is as follows: Copper chloride, sodium perfluorooctanoate, and dichloromethane were mixed in a mass ratio of 0.38:0.85:4. 1,3-bis(diphenylphosphine)propane was added in a mass ratio of 3 times that of copper chloride. The mixture was reacted at room temperature at 200 rpm for 24 h. After standing and separation, the mixture was filtered and then subjected to column chromatography with petroleum ether and ethyl acetate in a volume ratio of 1:1. The mixture was then dried with anhydrous sodium sulfate and rotary evaporated to obtain the light absorber. By mass percentage, the light diffusing agent and light absorbing agent were separately mixed with polystyrene and granulated. The mixture was then placed in a single-screw extruder and premixed at 600 rpm for 3 minutes. The mixture was then transferred to the single-screw extruder for extrusion. The feed section temperature was 200℃, the melt section temperature was 220℃, the metering section temperature was 230℃, the screw speed was 200 rpm, the die temperature was 230℃, the melt pressure was 10 MPa, the die gap was 0.6 mm, and the draw ratio was 1.01, resulting in a LAD single-layer high color gamut diffuser plate.

[0022] Example 2 In this embodiment, the thickness of the LAD single-layer high color gamut diffuser plate is 1.9 mm, comprising the following components by mass percentage: 1.6% light-diffusing agent silicon dioxide, 0.0004% light absorber with an absorption peak of 580 nm, 1.5% all-solid-state perovskite quantum dots, and the remainder being polystyrene; the all-solid-state perovskite quantum dots include red perovskite quantum dots and green perovskite quantum dots in a mass ratio of 1:10; the emission wavelength of the red perovskite quantum dots is 630 nm, and the full width at half maximum (FWHM) of the red perovskite quantum dots is 30 nm, the emission wavelength of the green perovskite quantum dots is 520 nm, and the FWHM of the red perovskite quantum dots is 19 nm.

[0023] The method for preparing the LAD single-layer high color gamut diffuser plate in this embodiment is as follows: Copper chloride, sodium perfluorooctanoate, and dichloromethane were mixed in a mass ratio of 0.38:0.86:6. 1,3-bis(diphenylphosphine)propane was added in a mass ratio of 3 to 4 times that of copper chloride. The mixture was reacted at room temperature at 300 rpm for 30 h. After standing and separation, the mixture was filtered and then subjected to column chromatography with petroleum ether and ethyl acetate in a volume ratio of 1:1. The mixture was then dried with anhydrous sodium sulfate and rotary evaporated to obtain the light absorber. By mass percentage, light diffusing agent, light absorbing agent, and quantum dots were separately mixed with polystyrene and granulated. The mixture was then placed in a single-screw extruder and premixed at 750 rpm for 4 minutes. The mixture was then transferred to the single-screw extruder for extrusion. The vacuum was reduced to 0.007 MPa, the feed section temperature was 210℃, the melt section temperature was 230℃, the metering section temperature was 245℃, the screw speed was 250 rpm, the die temperature was 240℃, the melt pressure was 15 MPa, the die gap was 0.9 mm, and the draw ratio was 1.03, resulting in a LAD single-layer high color gamut diffuser plate.

[0024] Example 3 In this embodiment, the thickness of the LAD single-layer high color gamut diffuser plate is 1.8~2mm, and it comprises the following components by mass percentage: 2% light diffusing agent silicon dioxide, 0.0005% light absorber with an absorption peak of 590nm, 2.5% all-solid-state perovskite quantum dots, and the remainder is polystyrene; the all-solid-state perovskite quantum dots include red perovskite quantum dots and green perovskite quantum dots in a mass ratio of 1:12; the emission wavelength of the red perovskite quantum dots is 635nm, and the full width at half maximum (FWHM) of the red perovskite quantum dots is 30nm, the emission wavelength of the green perovskite quantum dots is 525nm, and the FWHM of the red perovskite quantum dots is 19nm.

[0025] The method for preparing the LAD single-layer high color gamut diffuser plate in this embodiment is as follows: Copper chloride, sodium perfluorooctanoate, and dichloromethane were mixed in a mass ratio of 0.38:0.88:8. 1,3-bis(diphenylphosphine)propane was added in a mass ratio of 3 to 4 times that of copper chloride. The mixture was reacted at room temperature at 400 rpm for 36 h. After standing and separation, the mixture was filtered and then subjected to column chromatography with petroleum ether and ethyl acetate in a volume ratio of 1:1. The mixture was then dried with anhydrous sodium sulfate and rotary evaporated to obtain the light absorber. By mass percentage, light diffusing agent, light absorbing agent, and quantum dots were separately mixed with polystyrene and granulated. The mixture was then placed in a single-screw extruder and premixed at 900 rpm for 5 minutes. The mixture was then transferred to the single-screw extruder for extrusion. The vacuum was reduced to 0.008 MPa, the feed section temperature was 220℃, the melt section temperature was 240℃, the metering section temperature was 260℃, the screw speed was 300 rpm, the die temperature was 250℃, the melt pressure was 20 MPa, the die gap was 1.2 mm, and the draw ratio was 1.05 to obtain a single-layer high color gamut diffuser plate (LAD).

[0026] Comparative Example 1 The component content percentages of Comparative Example 1 are the same as those of Example 1. The difference between this LAD single-layer high color gamut diffuser plate and Example 2 is that, by mass percentage, quantum dots and polystyrene are mixed and granulated to form a quantum dot layer, which is placed in a single-screw main extruder; a light absorber layer is mixed and granulated with polystyrene to form a light absorber layer, which is placed in auxiliary extruder 1; and a diffuser layer is mixed and granulated with polystyrene to form a high-haze diffuser layer, which is placed in auxiliary extruder 2. The three layers are co-extruded, with the feed section temperature at 200°C, the melt section temperature at 220°C, the metering section temperature at 230°C, the screw speed at 200 rpm, the die temperature at 230°C, the melt pressure at 10 MPa, the die gap at 0.6 mm, and the draw ratio at 1.01, thus obtaining the LAD high color gamut diffuser plate.

[0027] Comparative Example 2 The component content percentages of Comparative Example 2 are the same as those of Example 2. The difference between this LAD single-layer high color gamut diffuser plate and Example 2 is that, by mass percentage, quantum dots and polystyrene are mixed and granulated to form a quantum dot layer, which is placed in a single-screw main extruder; a light absorber layer is mixed and granulated with polystyrene to form a light absorber layer, which is placed in auxiliary extruder 1; and a diffuser layer is mixed and granulated with polystyrene to form a high-haze diffuser layer, which is placed in auxiliary extruder 2. The three layers are co-extruded, with a feed section temperature of 210°C, a melt section temperature of 230°C, a metering section temperature of 245°C, a screw speed of 250 rpm, a die temperature of 240°C, a melt pressure of 15 MPa, a die gap of 0.9 mm, and a draw ratio of 1.03 to obtain the LAD high color gamut diffuser plate.

[0028] Comparative Example 3 The component content percentages of Comparative Example 3 are the same as those of Example 3. The difference between this LAD single-layer high color gamut diffuser plate and Example 2 is that, by mass percentage, quantum dots and polystyrene are mixed and granulated to form a quantum dot layer, which is placed in a single-screw main extruder; a light absorber layer is mixed and granulated with polystyrene to form a light absorber layer, which is placed in auxiliary extruder 1; and a diffuser layer is mixed and granulated with polystyrene to form a high-haze diffuser layer, which is placed in auxiliary extruder 2. The three layers are co-extruded, with the feed section temperature at 220°C, the melt section temperature at 240°C, the metering section temperature at 260°C, the screw speed at 300 rpm, the die temperature at 250°C, the melt pressure at 20 MPa, the die gap at 1.2 mm, and the draw ratio at 1.05, thus obtaining the LAD high color gamut diffuser plate.

[0029] Example of effect Table 1 below presents the performance analysis results of the LAD single-layer high color gamut diffusion plates prepared using Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention:

[0030] By comparing the experimental data of the examples and comparative examples in Table 1, it can be clearly found that the LAD single-layer high color gamut diffuser prepared using Examples 1, 2, and 3 have superior luminance and basically consistent uniformity.

[0031] Obviously, the above embodiments are merely examples to clearly illustrate the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A LAD single-layer high color gamut diffusion plate, characterized in that, The raw materials include the following by weight percentages: 0.8-2% light diffusing agent, 0.0003-0.0005% light absorber, 0-2.5% quantum dots, and the remainder being polystyrene; the light diffusing agent is silicon dioxide; the light absorber is copper ion compound powder with an absorption peak of 450-590 nm; and the quantum dots are all-solid-state perovskite quantum dots.

2. The LAD single-layer high color gamut diffusion plate according to claim 1, characterized in that, The LAD single-layer high color gamut diffuser plate is produced by mixing light diffusing agent and quantum dots with polystyrene, granulating the mixture, mixing it with light absorber, and then extruding it through a single-screw extruder.

3. The LAD single-layer high color gamut diffusion plate according to claim 1, characterized in that, The light absorber is prepared by reacting 1,3-bis(diphenylphosphine)propane, copper chloride and perfluorooctanoic acid, and the absorption peak of the light absorber is 580~590nm.

4. The LAD single-layer high color gamut diffusion plate according to claim 1, characterized in that, The light absorber is prepared by mixing copper chloride, sodium perfluorooctanoate, and dichloromethane in a mass ratio of 0.38:0.85~0.88:4~8, adding 3~4 times the mass of 1,3-bis(diphenylphosphine)propane, reacting at room temperature at 200~400 rpm for 24~36 h, allowing the mixture to stand and separate into layers, filtering, and then performing column chromatography with petroleum ether and ethyl acetate in a volume ratio of 1:

1. The mixture is then dried with anhydrous sodium sulfate and rotary evaporated to obtain the light absorber.

5. The LAD single-layer high color gamut diffusion plate according to claim 1, characterized in that, The light absorber is a purplish-red powder with a melting point greater than 300°C. Its solubility in dichloromethane is 5 g / L, in acetone is 0.3 g / L, and in cyclohexane is 0.5 g / L.

6. The LAD single-layer high color gamut diffusion plate according to claim 1, characterized in that, The all-solid-state perovskite quantum dots include red-light perovskite quantum dots and green-light perovskite quantum dots in a mass ratio of 1:8~12; the emission wavelength of the red-light perovskite quantum dots is 630~635 nm and the full width at half maximum (FWHM) of the red-light perovskite quantum dots is 30 nm, the emission wavelength of the green-light perovskite quantum dots is 520~525 nm and the FWHM of the red-light perovskite quantum dots is 19 nm.

7. A method for preparing a single-layer high color gamut diffusion plate for LAD as described in claim 2, characterized in that, After mixing and granulating the light diffusing agent, light absorbing agent, and quantum dots with polystyrene, the mixture is placed in a single-screw extruder and premixed at 600-900 rpm for 3-5 minutes. The mixture is then transferred to a single-screw extruder and vacuum extruded to obtain a single-layer high color gamut diffuser plate (LAD).

8. The method for preparing a single-layer high color gamut diffusion plate for LAD according to claim 7, characterized in that, During the vacuum extrusion process, the vacuum is evacuated to 0.006~0.008MPa, the feed section temperature is 200~220℃, the melting section temperature is 220~240℃, the metering section temperature is 230~260℃, the screw speed is 200~300rpm, the die temperature is 230~250℃, the melt pressure is 10~20MPa, the die gap is 0.6~1.2mm, and the draw ratio is 1.01~1.

05.

9. The method for preparing a single-layer high color gamut diffusion plate for LAD according to claim 7, characterized in that, The thickness of the LAD single-layer high color gamut diffusion plate is 1.8~2mm.

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