CN108415194B - LED backlight plate - Google Patents

LED backlight plate Download PDF

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Publication number
CN108415194B
CN108415194B CN201810196439.4A CN201810196439A CN108415194B CN 108415194 B CN108415194 B CN 108415194B CN 201810196439 A CN201810196439 A CN 201810196439A CN 108415194 B CN108415194 B CN 108415194B
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hours
dispersion liquid
temperature
organic silicon
microsphere
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CN108415194A (en
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陈林
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Guangzhou Lindian Intelligent Technology Co ltd
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Guangzhou Lindian Intelligent Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Luminescent Compositions (AREA)

Abstract

The invention provides an LED backlight plate which is composed of five layers of structures from top to bottom, namely a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, wherein an LED light bar is arranged on the hardware through-pressure backboard in a bonding mode. According to the LED backlight board, the LED lamp strip can be arranged in the middle of the hardware through-voltage backboard or around the hardware through-voltage backboard, and is made of materials with excellent optical effects, so that the production cost is reduced, the light emitting is uniform, and the light emitting efficiency is greatly improved.

Description

LED backlight plate
Technical Field
The invention belongs to the technical field of electric light sources, and particularly relates to an LED backlight board.
Background
Backlights are a form of illumination used in the display of liquid crystal displays to increase the illumination in low light environments and the brightness of computer displays, liquid crystal displays. The backlight plate is arranged behind the liquid crystal display and not only provides a light source, but also converts an originally uneven light source into an even light source.
The invention application with the application number of 201110125947.1 provides an LED backlight module and a light guide plate, wherein the LED backlight module comprises the light guide plate, LED lamp strips arranged on the periphery of the light guide plate and a metal back plate used for containing the light guide plate and the LED lamp strips, the four corners of the light guide plate are chamfered from the intersection point of the most marginal light of one LED lamp at the most marginal edge of the LED lamp strips and the light guide plate, and reflective sheets are adhered to the periphery of the light guide plate without the LED lamp strips and the chamfered parts. And the light guide plate begins from the intersection point of the light rays at the edge of the LED lamp strip and the light guide plate, and four corners of the light guide plate are chamfered. According to the LED backlight module, the four corners of the light guide plate are chamfered, so that the phenomenon of bright spots caused by light repetition in a right-angle light path is avoided, and the light emitted by the light guide plate is more uniform.
The invention with the application number of 201410688145.5 relates to an ultra-thin LED backlight board with good astigmatism, which comprises a black-and-white double-sided adhesive tape, an upper diamond sheet, a lower diamond sheet, a diffusion film, a light guide plate, a rubber frame and a reflection film which are sequentially stacked from top to bottom, wherein a flexible circuit board is arranged at the top of the light guide plate, an LED lamp is arranged on the flexible circuit board, salient points are arranged on the light guide plate, a plurality of parallel diamond-shaped columns are respectively distributed on each diamond sheet, and the directions of the diamond-shaped columns on the two diamond sheets are different by 90 degrees. The ultrathin LED backlight plate has good light scattering effect and light emitting efficiency.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme:
the invention aims to provide an LED backlight plate.
The invention provides an LED backlight plate which is sequentially composed of five layers of structures from top to bottom, namely a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard.
The LED lamp strip is arranged on the hardware through-pressure backboard in a bonding mode.
LED lamp strip can set up at the intermediate position that five metals LED to the back board, also can set up at five metals LED to the back board all around.
The diffusion plate is made of high-performance PS plastic.
The preparation process of the high-performance PS plastic comprises the following steps: PS and a light diffusant are mixed according to the weight ratio of 1: (0.005-0.008), fully mixing, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the temperature of the first section is 140-145 ℃, the temperature of the second section is 160-165 ℃, the temperature of the third section is 170-175 ℃, the temperature of the fourth section is 165-170 ℃, and the rotating speed is 30-80 revolutions per minute.
The light diffusant is one of titanium dioxide, barium sulfate, silicon dioxide, cerium dioxide, calcium carbonate, aluminum oxide, glass microspheres, organic silicon microspheres and organic silicon microsphere @ cerium dioxide composite microspheres.
Compared with other inorganic diffusants, the organic silicon microspheres have good compatibility with matrix resin and good dispersibility in matrix materials, but the organic silicon materials have certain limitations. The organosilicon microsphere @ cerium dioxide composite microsphere wraps cerium dioxide on the surface of the organosilicon microsphere, so that the obtained composite material has good compatibility and dispersibility, retains the blue light shielding performance of the cerium dioxide, and is beneficial to human health.
The organic silicon microsphere @ cerium dioxide composite microsphere is obtained by the following method: weighing 0.4-1 g of organic silicon microspheres, dispersing in 50-80 mL of absolute ethyl alcohol, and mechanically dispersing to obtain a dispersion liquid A; dispersing 0.6-0.7 g of cerous nitrate hexahydrate and 1.0-1.2 g of hexamethylenetetramine in 30-60 mL of deionized water, and mechanically dispersing to obtain a dispersion liquid B; mixing the dispersion liquid A and the dispersion liquid B, and stirring and reacting at the temperature of 70-75 ℃ at 50-130 r/min for 2-3 hours; centrifuging the reaction solution at 3000-4000 rpm for 10-25 minutes, and collecting the precipitate; and drying the precipitate at 60-80 ℃ for 1-2 hours, and calcining at 200-500 ℃ for 3-4 hours to obtain the organic silicon microsphere @ cerium dioxide composite microsphere.
The organic silicon microsphere is obtained by the following method: mixing a trimethoxy silane compound and deionized water according to a molar ratio of 1: (10-17), adjusting the pH value of the solution to 4-6 by using phosphoric acid with the mass fraction of 5-10%, and stirring and reacting for 1-3 hours at the temperature of 20-30 ℃ at 50-130 r/min; then adding ammonia water with the mass fraction of 20-25%, adjusting the pH to 8-10, and stirring and reacting at the temperature of 20-30 ℃ at 50-130 r/min for 4-5 hours; after the reaction is finished, filtering the reaction solution by using 100-200-mesh filter cloth, and collecting a filter cake; and washing the filter cake with water with the weight of 80-150 times that of the filter cake, and drying for 8-12 hours at the temperature of 100-120 ℃ and the vacuum degree of 0.07-0.09 MPa to obtain the organic silicon microspheres.
The trimethoxy silane compound is methyl trimethoxy silane or vinyl trimethoxy silane.
The surface of the organosilicon microsphere obtained by the two siloxanes of methyl trimethoxy silane and vinyl trimethoxy silane is distributed with silicon-oxygen-silicon bonds, carbon-hydrogen bonds and carbon-oxygen bonds, but the performance of the organosilicon microsphere is superior to that of the organosilicon microsphere, because the surface hydroxyl of the polyethylene siloxane microsphere can form hydrogen bonds and is more favorable for bonding.
The light guide plate is made of PMMA or nano particle reinforced PMMA plastic.
PMMA has high light transmittance, but its surface hardness is insufficient, heat resistance is poor, and abrasion of the surface is likely to occur. The inventors then tried to introduce inorganic particles into the interior of PMMA during in situ polymerization to improve the heat resistance and surface properties of PMMA materials.
The preparation method of the nano particle reinforced PMMA plastic comprises the following steps: mixing inorganic particles with methyl methacrylate, wherein the inorganic particles account for 5-20% of the mass of the methyl methacrylate, and performing ultrasonic treatment for 20-30 minutes at 20-30 ℃ under the conditions of ultrasonic power of 150-350W and ultrasonic frequency of 15-20 kHz to obtain a dispersion liquid; standing the dispersion liquid at 20-30 ℃ for 16-24 hours, continuing to perform ultrasonic treatment for 20-30 minutes under the conditions of 20-30 ℃, ultrasonic power of 150-350W and ultrasonic frequency of 15-20 kHz, adding azodiisobutyronitrile with the mass of 0.02-0.03 time of that of methyl methacrylate, reacting at 70-75 ℃ under the protection of nitrogen until the system viscosity reaches 0.85-0.9 Pa.s, and stopping the reaction; and drying the reaction liquid at 40-50 ℃ for 16-24 hours, and then drying at 100-110 ℃ for 1-2 hours to obtain the nano particle reinforced PMMA plastic.
The inorganic particles are one or a combination of nano zirconium dioxide, 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide and cellulose nano particles.
The preparation method of the 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide comprises the following steps: dispersing zirconium oxide in 3- (trimethoxysilyl) propyl methacrylate and tetrahydrofuran in a molar ratio (0.2-0.3): 1, in the mixed solution, zirconium oxide accounts for 1-1.5% of the mass of the mixed solution, and a dispersion liquid is obtained; carrying out ultrasonic treatment on the dispersion liquid for 20-30 minutes under the conditions of 20-30 ℃, 150-350W of ultrasonic power and 15-20 kHz of ultrasonic frequency, standing for 20-24 hours at 60-70 ℃, adding methanol with the volume of 0.09-0.1 time of that of the dispersion liquid, and precipitating; centrifuging at 2000-3000 r/min for 15-20 min, and taking a bottom solid; and drying the bottom solid for 8-12 hours at 50-60 ℃ and under the vacuum degree of 0.07-0.08 MPa to obtain the 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide.
The preparation method of the cellulose nano-particles comprises the following steps: microcrystalline cellulose and concentrated sulfuric acid with the mass fraction of 98% are mixed according to the proportion of 1: (8-10) (g/mL), stirring for 1-2 hours at 40-45 ℃ at 80-120 rpm, and diluting the mixed solution by 5-6 times with water to obtain a suspension; centrifuging the suspension at 12000-16000 r/min for 10-20 min, and collecting the precipitate; the precipitate and distilled water were mixed in a ratio of 1: (15-20) (g/mL), homogenizing under 150-200 Mpa for 10-20 minutes, putting into a dialysis bag with relative molecular mass of 12000-14000, and dialyzing in distilled water until pH reaches 6-7; and (3) carrying out vacuum freeze drying on the dialysate to obtain the cellulose nanoparticles.
The LED backlight plate is made of materials with excellent optical effect, so that the production cost is reduced, the light emitting is uniform, and the luminous efficiency is greatly improved. The LED lamp strip can be arranged in the middle of the hardware through-pressure backboard and can also be arranged around the hardware through-pressure backboard.
Detailed Description
Introduction of raw materials in the examples:
commercially available Polymethylmethacrylate (PMMA), supplied by LG chemistry of korea, has a relative molecular mass of about 200 ten thousand.
Polystyrene (PS) supplied by basf, mn, model 466F.
Cerium oxide, CAS No.: 1306-38-3, available from Shanghai slush, Inc., liquid Metal materials, having a particle size of 100 to 130 nm.
Methyltrimethoxysilane, CAS No.: 1185-55-3, available from Tianjin Xiansi Biotechnology, Inc.
Cerous nitrate hexahydrate, CAS No.: 10294-41-4, available from Afahesar chemical Co., Ltd.
Hexamethylenetetramine, CAS No.: 100-97-0, available from alfa aesar (china) chemical co.
Vinyltrimethoxysilane, CAS No.: 2768-02-7, available from caruncle morning light chemical, inc.
The nano zirconium dioxide is purchased from Zhengzhou Chenopou chemical products Co., Ltd, and has a particle size of 100-130 nm.
Methyl methacrylate, CAS No.: 80-62-6, available from Shanghai Allantin Biotechnology Ltd.
Azobisisobutyronitrile, CAS number: 78-67-1, available from Shanghai Teita chemical science and technology Limited.
3- (trimethoxysilyl) propyl methacrylate, CAS No.: 2530-85-0, available from caruncle morning light chemical, inc.
Microcrystalline cellulose, CAS No.: 9004-34-6, obtained from Sendy Biotech, Shenzhen, with a particle size of 25-60 μm.
Example 1
The LED backlight plate is composed of five layers of structures from top to bottom, and is respectively a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, and an LED light bar is bonded on the hardware through-pressure backboard.
The diffusion plate is prepared from high-performance PS plastic according to a conventional process.
The light guide plate is prepared from methyl methacrylate sold in the market according to a conventional process.
The preparation process of the high-performance PS plastic comprises the following steps: PS and cerium dioxide are mixed according to the weight ratio of 1: 0.008, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the first-stage temperature is 140 ℃, the second-stage temperature is 160 ℃, the third-stage temperature is 170 ℃, the fourth-stage temperature is 165 ℃ and the rotating speed is 70 r/min.
Example 2
The LED backlight plate is composed of five layers of structures from top to bottom, and is respectively a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, and an LED light bar is bonded on the hardware through-pressure backboard.
The diffusion plate is prepared from high-performance PS plastic according to a conventional process.
The light guide plate is prepared from methyl methacrylate sold in the market according to a conventional process.
The preparation process of the high-performance PS plastic comprises the following steps: PS and organic silicon microspheres are mixed according to the weight ratio of 1: 0.008, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the first-stage temperature is 140 ℃, the second-stage temperature is 160 ℃, the third-stage temperature is 170 ℃, the fourth-stage temperature is 165 ℃ and the rotating speed is 70 r/min.
The organic silicon microsphere is obtained by the following method: mixing methyltrimethoxysilane and deionized water according to a molar ratio of 1: 16, adjusting the pH value of the solution to 5 by adopting phosphoric acid with the mass fraction of 10%, and stirring and reacting for 1 hour at the temperature of 20 ℃ at the speed of 130 r/min; then adding ammonia water with the mass fraction of 25%, adjusting the pH value to 8, and stirring and reacting at 20 ℃ at 130 r/min for 4 hours; after the reaction is finished, filtering the reaction solution by using 200-mesh filter cloth, and collecting a filter cake; and washing the filter cake with water with the weight of 80 times that of the filter cake, and drying for 8 hours at the temperature of 100 ℃ and the vacuum degree of 0.07MPa to obtain the organic silicon microspheres.
Example 3
The LED backlight plate is composed of five layers of structures from top to bottom, and is respectively a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, and an LED light bar is bonded on the hardware through-pressure backboard. The diffusion plate is prepared from high-performance PS plastic according to a conventional process.
The light guide plate is prepared from methyl methacrylate sold in the market according to a conventional process.
The preparation process of the high-performance PS plastic comprises the following steps: PS and organic silicon microsphere @ cerium dioxide composite microsphere are prepared according to the weight ratio of 1: 0.008, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the first-stage temperature is 140 ℃, the second-stage temperature is 160 ℃, the third-stage temperature is 170 ℃, the fourth-stage temperature is 165 ℃ and the rotating speed is 70 r/min.
The organic silicon microsphere @ cerium dioxide composite microsphere is obtained by the following method: weighing 0.8g of organic silicon microspheres, dispersing in 60mL of absolute ethyl alcohol, and mechanically dispersing to obtain a dispersion liquid A; dispersing 0.6g of cerous nitrate hexahydrate and 1.0g of hexamethylenetetramine in 50mL of deionized water, and mechanically dispersing to obtain a dispersion liquid B; mixing the dispersion A and the dispersion B, and stirring and reacting at 70 ℃ at 130 revolutions per minute for 2 hours; centrifuging the reaction solution at 3000 rpm for 10 minutes, and collecting the precipitate; and drying the precipitate at 70 ℃ for 2 hours, and calcining at 400 ℃ for 3 hours to obtain the organic silicon microsphere @ cerium dioxide composite microsphere.
The organic silicon microsphere is obtained by the following method: mixing methyltrimethoxysilane and deionized water according to a molar ratio of 1: 16, adjusting the pH value of the solution to 5 by adopting phosphoric acid with the mass fraction of 10%, and stirring and reacting for 1 hour at the temperature of 20 ℃ at the speed of 130 r/min; then adding ammonia water with the mass fraction of 25%, adjusting the pH value to 8, and stirring and reacting at 20 ℃ at 130 r/min for 4 hours; after the reaction is finished, filtering the reaction solution by using 200-mesh filter cloth, and collecting a filter cake; and washing the filter cake with water with the weight of 80 times that of the filter cake, and drying for 8 hours at the temperature of 100 ℃ and the vacuum degree of 0.07MPa to obtain the organic silicon microspheres.
Example 4
The LED backlight plate is composed of five layers of structures from top to bottom, and is respectively a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, and an LED light bar is bonded on the hardware through-pressure backboard.
The diffusion plate is prepared from high-performance PS plastic according to a conventional process.
The light guide plate is prepared from methyl methacrylate sold in the market according to a conventional process.
The preparation process of the high-performance PS plastic comprises the following steps: PS and organic silicon microsphere @ cerium dioxide composite microsphere are prepared according to the weight ratio of 1: 0.008, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the first-stage temperature is 140 ℃, the second-stage temperature is 160 ℃, the third-stage temperature is 170 ℃, the fourth-stage temperature is 165 ℃ and the rotating speed is 70 r/min.
The organic silicon microsphere @ cerium dioxide composite microsphere is obtained by the following method: weighing 0.8g of organic silicon microspheres, dispersing in 60mL of absolute ethyl alcohol, and mechanically dispersing to obtain a dispersion liquid A; dispersing 0.6g of cerous nitrate hexahydrate and 1.0g of hexamethylenetetramine in 50mL of deionized water, and mechanically dispersing to obtain a dispersion liquid B; mixing the dispersion A and the dispersion B, and stirring and reacting at 70 ℃ at 130 revolutions per minute for 2 hours; centrifuging the reaction solution at 3000 rpm for 10 minutes, and collecting the precipitate; and drying the precipitate at 70 ℃ for 2 hours, and calcining at 400 ℃ for 3 hours to obtain the organic silicon microsphere @ cerium dioxide composite microsphere.
The organic silicon microsphere is obtained by the following method: mixing vinyl trimethoxy silane and deionized water according to a molar ratio of 1: 16, adjusting the pH value of the solution to 5 by adopting phosphoric acid with the mass fraction of 10%, and stirring and reacting for 1 hour at the temperature of 20 ℃ at the speed of 130 r/min; then adding ammonia water with the mass fraction of 25%, adjusting the pH value to 8, and stirring and reacting at 20 ℃ at 130 r/min for 4 hours; after the reaction is finished, filtering the reaction solution by using 200-mesh filter cloth, and collecting a filter cake; and washing the filter cake with water with the weight of 80 times that of the filter cake, and drying for 8 hours at the temperature of 100 ℃ and the vacuum degree of 0.07MPa to obtain the organic silicon microspheres.
Example 5
The LED backlight plate is composed of five layers of structures from top to bottom, and is respectively a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, and an LED light bar is bonded on the hardware through-pressure backboard.
The diffusion plate is prepared from high-performance PS plastic according to a conventional process.
The light guide plate is prepared from a PMMA-nano zirconium dioxide hybrid material according to a conventional process.
The preparation process of the high-performance PS plastic comprises the following steps: PS and organic silicon microsphere @ cerium dioxide composite microsphere are prepared according to the weight ratio of 1: 0.008, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the first-stage temperature is 140 ℃, the second-stage temperature is 160 ℃, the third-stage temperature is 170 ℃, the fourth-stage temperature is 165 ℃ and the rotating speed is 70 r/min.
The organic silicon microsphere @ cerium dioxide composite microsphere is obtained by the following method: weighing 0.8g of organic silicon microspheres, dispersing in 60mL of absolute ethyl alcohol, and mechanically dispersing to obtain a dispersion liquid A; dispersing 0.6g of cerous nitrate hexahydrate and 1.0g of hexamethylenetetramine in 50mL of deionized water, and mechanically dispersing to obtain a dispersion liquid B; mixing the dispersion A and the dispersion B, and stirring and reacting at 70 ℃ at 130 revolutions per minute for 2 hours; centrifuging the reaction solution at 3000 rpm for 10 minutes, and collecting the precipitate; and drying the precipitate at 70 ℃ for 2 hours, and calcining at 400 ℃ for 3 hours to obtain the organic silicon microsphere @ cerium dioxide composite microsphere.
The organic silicon microsphere is obtained by the following method: mixing vinyl trimethoxy silane and deionized water according to a molar ratio of 1: 16, adjusting the pH value of the solution to 5 by adopting phosphoric acid with the mass fraction of 10%, and stirring and reacting for 1 hour at the temperature of 20 ℃ at the speed of 130 r/min; then adding ammonia water with the mass fraction of 25%, adjusting the pH value to 8, and stirring and reacting at 20 ℃ at 130 r/min for 4 hours; after the reaction is finished, filtering the reaction solution by using 200-mesh filter cloth, and collecting a filter cake; and washing the filter cake with water with the weight of 80 times that of the filter cake, and drying for 8 hours at the temperature of 100 ℃ and the vacuum degree of 0.07MPa to obtain the organic silicon microspheres.
The preparation method of the PMMA-nano zirconium dioxide hybrid material comprises the following steps: mixing nano zirconium dioxide with methyl methacrylate, wherein the nano zirconium dioxide accounts for 10% of the mass of the methyl methacrylate, and performing ultrasonic treatment for 20 minutes under the conditions of 20 ℃, 350W of ultrasonic power and 20kHz of ultrasonic frequency to obtain a dispersion liquid; standing the dispersion liquid at 20 ℃ for 24 hours, continuing to perform ultrasonic treatment for 20 minutes under the conditions of 20 ℃, ultrasonic power of 350W and ultrasonic frequency of 20kHz, adding azobisisobutyronitrile with the mass of 0.03 time of methyl methacrylate, reacting at 70 ℃ under the protection of nitrogen until the system viscosity reaches 0.9 Pa.s, and stopping the reaction; and drying the reaction solution at 40 ℃ for 24 hours, and then drying at 100 ℃ for 2 hours to obtain the PMMA-nano zirconium dioxide hybrid material.
Example 6
The LED backlight plate is composed of five layers of structures from top to bottom, and is respectively a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, and an LED light bar is bonded on the hardware through-pressure backboard.
The diffusion plate is prepared from high-performance PS plastic according to a conventional process.
The light guide plate is prepared from a PMMA-3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide hybrid material according to a conventional process.
The preparation process of the high-performance PS plastic comprises the following steps: PS and organic silicon microsphere @ cerium dioxide composite microsphere are prepared according to the weight ratio of 1: 0.008, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the first-stage temperature is 140 ℃, the second-stage temperature is 160 ℃, the third-stage temperature is 170 ℃, the fourth-stage temperature is 165 ℃ and the rotating speed is 70 r/min.
The organic silicon microsphere @ cerium dioxide composite microsphere is obtained by the following method: weighing 0.8g of organic silicon microspheres, dispersing in 60mL of absolute ethyl alcohol, and mechanically dispersing to obtain a dispersion liquid A; dispersing 0.6g of cerous nitrate hexahydrate and 1.0g of hexamethylenetetramine in 50mL of deionized water, and mechanically dispersing to obtain a dispersion liquid B; mixing the dispersion A and the dispersion B, and stirring and reacting at 70 ℃ at 130 revolutions per minute for 2 hours; centrifuging the reaction solution at 3000 rpm for 10 minutes, and collecting the precipitate; and drying the precipitate at 70 ℃ for 2 hours, and calcining at 400 ℃ for 3 hours to obtain the organic silicon microsphere @ cerium dioxide composite microsphere.
The organic silicon microsphere is obtained by the following method: mixing vinyl trimethoxy silane and deionized water according to a molar ratio of 1: 16, adjusting the pH value of the solution to 5 by adopting phosphoric acid with the mass fraction of 10%, and stirring and reacting for 1 hour at the temperature of 20 ℃ at the speed of 130 r/min; then adding ammonia water with the mass fraction of 25%, adjusting the pH value to 8, and stirring and reacting at 20 ℃ at 130 r/min for 4 hours; after the reaction is finished, filtering the reaction solution by using 200-mesh filter cloth, and collecting a filter cake; and washing the filter cake with water with the weight of 80 times that of the filter cake, and drying for 8 hours at the temperature of 100 ℃ and the vacuum degree of 0.07MPa to obtain the organic silicon microspheres.
The preparation method of the PMMA-3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide hybrid material comprises the following steps: mixing 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide with methyl methacrylate, wherein the 3- (trimethoxysilyl) propyl methacrylate modified zirconium dioxide accounts for 10% of the mass of the methyl methacrylate, and performing ultrasonic treatment for 20 minutes at 20 ℃, the ultrasonic power of 350W and the ultrasonic frequency of 20kHz to obtain a dispersion liquid; standing the dispersion liquid at 20 ℃ for 24 hours, continuing to perform ultrasonic treatment for 20 minutes under the conditions of 20 ℃, ultrasonic power of 350W and ultrasonic frequency of 20kHz, adding azobisisobutyronitrile with the mass of 0.03 time of methyl methacrylate, reacting at 70 ℃ under the protection of nitrogen until the system viscosity reaches 0.9 Pa.s, and stopping the reaction; and drying the reaction liquid at 40 ℃ for 24 hours, and then drying at 100 ℃ for 2 hours to obtain the PMMA-3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide hybrid material.
Preparing 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide: dispersing zirconium dioxide in 3- (trimethoxysilyl) propyl methacrylate and tetrahydrofuran in a molar ratio of 0.2: 1, the zirconium dioxide accounts for 1.5 percent of the mass of the mixed solution to obtain a dispersion liquid; carrying out ultrasonic treatment on the dispersion liquid for 20 minutes under the conditions of 20 ℃, ultrasonic power of 350W and ultrasonic frequency of 20kHz, standing for 24 hours at 60 ℃, adding methanol which is 0.09 times of the volume of the dispersion liquid, and precipitating; centrifuging at 3000 rpm for 15 min, and taking the bottom solid; and drying the bottom solid for 12 hours at the temperature of 50 ℃ and the vacuum degree of 0.07MPa to obtain the 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide.
Example 7
The LED backlight plate is composed of five layers of structures from top to bottom, and is respectively a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, and an LED light bar is bonded on the hardware through-pressure backboard.
The diffusion plate is prepared from high-performance PS plastic according to a conventional process.
The light guide plate is prepared from a PMMA-cellulose nanoparticle hybrid material according to a conventional process.
The preparation process of the high-performance PS plastic comprises the following steps: PS and organic silicon microsphere @ cerium dioxide composite microsphere are prepared according to the weight ratio of 1: 0.008, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the first-stage temperature is 140 ℃, the second-stage temperature is 160 ℃, the third-stage temperature is 170 ℃, the fourth-stage temperature is 165 ℃ and the rotating speed is 70 r/min.
The organic silicon microsphere @ cerium dioxide composite microsphere is obtained by the following method: weighing 0.8g of organic silicon microspheres, dispersing in 60mL of absolute ethyl alcohol, and mechanically dispersing to obtain a dispersion liquid A; dispersing 0.6g of cerous nitrate hexahydrate and 1.0g of hexamethylenetetramine in 50mL of deionized water, and mechanically dispersing to obtain a dispersion liquid B; mixing the dispersion A and the dispersion B, and stirring and reacting at 70 ℃ at 130 revolutions per minute for 2 hours; centrifuging the reaction solution at 3000 rpm for 10 minutes, and collecting the precipitate; and drying the precipitate at 70 ℃ for 2 hours, and calcining at 400 ℃ for 3 hours to obtain the organic silicon microsphere @ cerium dioxide composite microsphere.
The organic silicon microsphere is obtained by the following method: mixing vinyl trimethoxy silane and deionized water according to a molar ratio of 1: 16, adjusting the pH value of the solution to 5 by adopting phosphoric acid with the mass fraction of 10%, and stirring and reacting for 1 hour at the temperature of 20 ℃ at the speed of 130 r/min; then adding ammonia water with the mass fraction of 25%, adjusting the pH value to 8, and stirring and reacting at 20 ℃ at 130 r/min for 4 hours; after the reaction is finished, filtering the reaction solution by using 200-mesh filter cloth, and collecting a filter cake; and washing the filter cake with water with the weight of 80 times that of the filter cake, and drying for 8 hours at the temperature of 100 ℃ and the vacuum degree of 0.07MPa to obtain the organic silicon microspheres.
The preparation method of the PMMA-cellulose nano particle hybrid material comprises the following steps: mixing cellulose nano particles with methyl methacrylate, wherein the cellulose nano particles account for 10% of the mass of the methyl methacrylate, and performing ultrasonic treatment for 20 minutes at the temperature of 20 ℃, the ultrasonic power of 350W and the ultrasonic frequency of 20kHz to obtain a dispersion liquid; standing the dispersion liquid at 20 ℃ for 24 hours, continuing to perform ultrasonic treatment for 20 minutes under the conditions of 20 ℃, ultrasonic power of 350W and ultrasonic frequency of 20kHz, adding azobisisobutyronitrile with the mass of 0.03 time of methyl methacrylate, reacting at 70 ℃ under the protection of nitrogen until the system viscosity reaches 0.9 Pa.s, and stopping the reaction; and drying the reaction solution at 40 ℃ for 24 hours, and then drying at 100 ℃ for 2 hours to obtain the PMMA-cellulose nano particle hybrid material.
Preparing the cellulose nano-particles: microcrystalline cellulose and concentrated sulfuric acid with the mass fraction of 98% are mixed according to the proportion of 1: 8(g/mL), stirring at 40 ℃ for 1 hour at 120 revolutions per minute, and diluting the mixed solution by 5 times with distilled water to obtain a suspension; centrifuging the suspension at 12000 r/min for 15 min, and collecting precipitate; the precipitate and distilled water were mixed in a ratio of 1: 20(g/mL), homogenizing under 200Mpa for 10 min, placing into dialysis bag with relative molecular mass of 14000, and dialyzing in distilled water until pH reaches 7; and (3) carrying out vacuum freeze drying on the dialysate to obtain the cellulose nanoparticles.
Example 8
The LED backlight plate is composed of five layers of structures from top to bottom, and is respectively a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, and an LED light bar is bonded on the hardware through-pressure backboard.
The diffusion plate is prepared from high-performance PS plastic according to a conventional process.
The light guide plate is prepared from nano particle reinforced PMMA plastic according to a conventional process.
The preparation process of the high-performance PS plastic comprises the following steps: PS and organic silicon microsphere @ cerium dioxide composite microsphere are prepared according to the weight ratio of 1: 0.008, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the first-stage temperature is 140 ℃, the second-stage temperature is 160 ℃, the third-stage temperature is 170 ℃, the fourth-stage temperature is 165 ℃ and the rotating speed is 70 r/min.
The organic silicon microsphere @ cerium dioxide composite microsphere is obtained by the following method: weighing 0.8g of organic silicon microspheres, dispersing in 60mL of absolute ethyl alcohol, and mechanically dispersing to obtain a dispersion liquid A; dispersing 0.6g of cerous nitrate hexahydrate and 1.0g of hexamethylenetetramine in 50mL of deionized water, and mechanically dispersing to obtain a dispersion liquid B; mixing the dispersion A and the dispersion B, and stirring and reacting at 70 ℃ at 130 revolutions per minute for 2 hours; centrifuging the reaction solution at 3000 rpm for 10 minutes, and collecting the precipitate; and drying the precipitate at 70 ℃ for 2 hours, and calcining at 400 ℃ for 3 hours to obtain the organic silicon microsphere @ cerium dioxide composite microsphere.
The organic silicon microsphere is obtained by the following method: mixing vinyl trimethoxy silane and deionized water according to a molar ratio of 1: 16, adjusting the pH value of the solution to 5 by adopting phosphoric acid with the mass fraction of 10%, and stirring and reacting for 1 hour at the temperature of 20 ℃ at the speed of 130 r/min; then adding ammonia water with the mass fraction of 25%, adjusting the pH value to 8, and stirring and reacting at 20 ℃ at 130 r/min for 4 hours; after the reaction is finished, filtering the reaction solution by using 200-mesh filter cloth, and collecting a filter cake; and washing the filter cake with water with the weight of 80 times that of the filter cake, and drying for 8 hours at the temperature of 100 ℃ and the vacuum degree of 0.07MPa to obtain the organic silicon microspheres.
The preparation method of the nano particle reinforced PMMA plastic comprises the following steps: mixing inorganic particles with methyl methacrylate, wherein the inorganic particles account for 10% of the mass of the methyl methacrylate, and the inorganic particles are cellulose nanoparticles and 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide in a mass ratio of 1: 0.7, performing ultrasonic treatment for 20 minutes at 20 ℃, the ultrasonic power of 350W and the ultrasonic frequency of 20kHz to obtain a dispersion liquid; standing the dispersion liquid at 20 ℃ for 24 hours, continuing to perform ultrasonic treatment for 20 minutes under the conditions of 20 ℃, ultrasonic power of 350W and ultrasonic frequency of 20kHz, adding azobisisobutyronitrile with the mass of 0.03 time of methyl methacrylate, reacting at 70 ℃ under the protection of nitrogen until the system viscosity reaches 0.9 Pa.s, and stopping the reaction; and drying the reaction solution at 40 ℃ for 24 hours, and then drying at 100 ℃ for 2 hours to obtain the PMMA-cellulose nano particle hybrid material.
Preparing 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide: dispersing zirconium dioxide in 3- (trimethoxysilyl) propyl methacrylate and tetrahydrofuran in a molar ratio of 0.2: 1, the zirconium dioxide accounts for 1.5 percent of the mass of the mixed solution to obtain a dispersion liquid; carrying out ultrasonic treatment on the dispersion liquid for 20 minutes under the conditions of 20 ℃, ultrasonic power of 350W and ultrasonic frequency of 20kHz, standing for 24 hours at 60 ℃, adding methanol which is 0.09 times of the volume of the dispersion liquid, and precipitating; centrifuging at 3000 rpm for 15 min, and taking the bottom solid; and drying the bottom solid for 12 hours at the temperature of 50 ℃ and the vacuum degree of 0.07MPa to obtain the 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide.
Preparing the cellulose nano-particles: microcrystalline cellulose and concentrated sulfuric acid with the mass fraction of 98% are mixed according to the proportion of 1: 8(g/mL), stirring at 40 ℃ for 1 hour at 120 revolutions per minute, and diluting the mixed solution by 5 times with water to obtain a suspension; centrifuging the suspension at 12000 r/min for 15 min, and collecting precipitate; the precipitate and distilled water were mixed in a ratio of 1: 20(g/mL), homogenizing under 200Mpa for 10 min, placing into dialysis bag with relative molecular mass of 14000, and dialyzing in distilled water until pH reaches 7; and (3) carrying out vacuum freeze drying on the dialysate to obtain the cellulose nanoparticles.
Test example 1
The high performance PS plastics used in examples 1-4 were tested for light transmittance and haze. The test results are shown in table 1.
Testing of light transmittance: the test specimen size was 50X 1.5 mm. The formula is expressed as follows: the light transmittance is T1/T2 multiplied by 100%. Where T1 denotes the luminous flux after passing through the spline, and T2 denotes the luminous flux of incident light. The ultraviolet-visible light transmittance was obtained by using a UV-2501PC type ultraviolet-visible spectrophotometer manufactured by Shimadzu corporation of Japan, and the wavelength was 550nm using air as a reference.
Haze was measured: the test specimen size was 50X 1.5 mm. The formula is expressed as follows: percent haze ═ 100% of (T1/T2-T3/T4). Where T1 denotes the luminous flux of diffused light of the instrument and the sample, T2 denotes the luminous flux after passing through the sample, T3 denotes the luminous flux of diffused light of the instrument, and T4 denotes the luminous flux of incident light.
Table 1: table of light transmittance and haze test results
Light transmittance (%) Haze (%)
Example 1 80.2 82.5
Example 2 83.1 88.7
Example 3 88.5 90.6
Example 4 90.7 91.4
Test example 2
The light guide plate materials used in examples 4 to 8 were subjected to comprehensive property tests. The test results are shown in table 2.
Preparing a sample: the light guide plate materials adopted in examples 4 to 8 were prepared into a solution with a solid content of 30% by using dimethylformamide as a solvent; spin-coating the solution on a silicon wafer by a spin coater at a rotating speed of 3000 rpm for 40 seconds, and then treating the silicon wafer obtained by spin-coating at 80 ℃ for 2 hours, at 100 ℃ for 1 hour and at 150 ℃ for 1 hour to obtain a film with the thickness of 250 nm.
And (3) testing light transmittance: the silicon wafer obtained by spin coating was tested on a UV-2501PC type UV-visible spectrophotometer manufactured by Shimadzu corporation of Japan, using air as a reference, at a wavelength of 550 nm.
Measurement of thermal expansion coefficient: the method is carried out by adopting a TMA Q400 thermal mechanical analyzer provided by Shanghai Haohan science and technology development Limited, the sample size is 25mm multiplied by 3mm, the sample is heated to 30 ℃ from 0 ℃ at the heating rate of 0.5 ℃/minute under the condition of a stretching mode, and the coefficient of thermal expansion is obtained at 10-30 ℃. The results of 5 replicates were taken as the average.
Measurement of tensile Properties: the method is carried out by adopting a DY-2 universal mechanical testing machine provided by Dongyang mechanical Co., Ltd, Dongguan city, the capacity of the sensor is 100N, the metering length is 30mm, the loading rate is 1mm/min, and the sample size is 50mm multiplied by 3 mm. The results of 5 replicates were taken as the average.
And (3) testing the scratch resistance: the abrasion was carried out by using a Taber5131 abrasion apparatus provided by Zhenglan precision instruments Co., Ltd, Dongguan, after the sample was abraded for 20 cycles under the conditions of CS-10 grinding wheel and 500g load,the transmittance of the sample at a wavelength of 550nm was recorded. The optical transmittance decrease value (Δ T) of the sample due to abrasion was calculated by the following formula: Δ T ═ T0-T1)/T1X 100%. Wherein, T0Transmittance, T, of the sample before abrasion resistance test1The transmittance of the sample after the abrasion resistance test. The lower the Δ T, the better the wear resistance. The results of 5 replicates were taken as the average.
Table 2: test result table for comprehensive performance of light guide plate material
Figure BDA0001593250200000151
From the data, the light transmittance of the light guide plate material obtained by an ultraviolet-visible spectrophotometer is more than 80%, which shows that the light guide plate material has an antireflection effect on visible light. Examples 5-7 have improved properties, stretchability and surface properties of the material compared to example 4, with examples 6 and 7 being superior. The reason for this may be that in example 6, in the in-situ polymerization process, high crystallinity zirconium dioxide nanoparticles are used as raw materials and introduced into the PMMA matrix, and the zirconium dioxide nanoparticles are highly dispersed in the organic matrix with the aid of the modifier; the cellulose nano particles are different from inorganic particles, have larger specific surface area, higher reaction activity and super-strong adsorption capacity, and most importantly, have excellent dispersibility and compatibility in a composite material matrix.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

  1. The LED backlight board is characterized by sequentially comprising five layers of structures from top to bottom, namely a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard;
    the light guide plate is made of nano particle reinforced PMMA plastic;
    the preparation method of the nano particle reinforced PMMA plastic comprises the following steps: mixing inorganic particles with methyl methacrylate, wherein the inorganic particles account for 5-20% of the mass of the methyl methacrylate, and performing ultrasonic treatment for 20-30 minutes at 20-30 ℃ under the conditions of ultrasonic power of 150-350W and ultrasonic frequency of 15-20 kHz to obtain a dispersion liquid; standing the dispersion liquid at 20-30 ℃ for 16-24 hours, continuing to perform ultrasonic treatment for 20-30 minutes under the conditions of 20-30 ℃, ultrasonic power of 150-350W and ultrasonic frequency of 15-20 kHz, adding azodiisobutyronitrile with the mass of 0.02-0.03 time of that of methyl methacrylate, reacting at 70-75 ℃ under the protection of nitrogen until the system viscosity reaches 0.85-0.9 Pa.s, and stopping the reaction; drying the reaction liquid at 40-50 ℃ for 16-24 hours, and then drying at 100-110 ℃ for 1-2 hours to obtain the nano particle reinforced PMMA plastic;
    the inorganic particles are cellulose nanoparticles and 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide, and the mass ratio of the nano zirconium dioxide to the inorganic particles is 1: 0.7 of a mixture.
  2. 2. The LED backlight board of claim 1, wherein an LED light bar is adhesively arranged on the hardware through-pressure backboard.
  3. 3. The LED backlight plate as claimed in claim 1, wherein the diffusion sheet is made of high-performance PS plastic, and the preparation process of the high-performance PS plastic comprises the following steps: PS and a light diffusant are mixed according to the weight ratio of 1: (0.005-0.008), fully mixing, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the temperature of the first section is 140-145 ℃, the temperature of the second section is 160-165 ℃, the temperature of the third section is 170-175 ℃, the temperature of the fourth section is 165-170 ℃, and the rotating speed is 30-80 revolutions per minute.
  4. 4. The LED backlight panel of claim 3, wherein the light diffuser is one of titanium dioxide, barium sulfate, silica, ceria, calcium carbonate, alumina, glass beads, silicone microspheres @ ceria composite microspheres.
  5. 5. The LED backlight plate of claim 4, wherein the silicone microsphere @ ceria composite microsphere is obtained by: weighing 0.4-1 g of organic silicon microspheres, dispersing in 50-80 mL of absolute ethyl alcohol, and mechanically dispersing to obtain a dispersion liquid A; dispersing 0.6-0.7 g of cerous nitrate hexahydrate and 1.0-1.2 g of hexamethylenetetramine in 30-60 mL of deionized water, and mechanically dispersing to obtain a dispersion liquid B; mixing the dispersion liquid A and the dispersion liquid B, and stirring and reacting at the temperature of 70-75 ℃ at 50-130 r/min for 2-3 hours; centrifuging the reaction solution at 3000-4000 rpm for 10-25 minutes, and collecting the precipitate; and drying the precipitate at 60-80 ℃ for 1-2 hours, and calcining at 200-500 ℃ for 3-4 hours to obtain the organic silicon microsphere @ cerium dioxide composite microsphere.
  6. 6. The LED backlight plate as claimed in claim 4 or 5, wherein the silicone microspheres are obtained by: mixing a trimethoxy silane compound and deionized water according to a molar ratio of 1: (10-17), adjusting the pH value of the solution to 4-6 by using phosphoric acid with the mass fraction of 5-10%, and stirring and reacting for 1-3 hours at the temperature of 20-30 ℃ at 50-130 r/min; then adding ammonia water with the mass fraction of 20-25%, adjusting the pH to 8-10, and stirring and reacting at the temperature of 20-30 ℃ at 50-130 r/min for 4-5 hours; after the reaction is finished, filtering the reaction solution by using 100-200-mesh filter cloth, and collecting a filter cake; and washing the filter cake with water with the weight of 80-150 times that of the filter cake, and drying for 8-12 hours at the temperature of 100-120 ℃ and the vacuum degree of 0.07-0.09 MPa to obtain the organic silicon microspheres.
  7. 7. The LED backlight of claim 6, wherein the trimethoxysilane compound is methyltrimethoxysilane or vinyltrimethoxysilane.
  8. 8. The LED backlight board as claimed in claim 1, wherein the LED backlight board is composed of five layers of structures from top to bottom, including a brightness enhancement film, a diffusion film, a light guide plate, a reflection film and a hardware through-pressure backboard, and the hardware through-pressure backboard is provided with an LED light bar in a bonding manner;
    the diffusion sheet is prepared from high-performance PS plastic according to a conventional process;
    the light guide plate is prepared from nano particle reinforced PMMA plastic according to a conventional process;
    the preparation process of the high-performance PS plastic comprises the following steps: PS and organic silicon microsphere @ cerium dioxide composite microsphere are prepared according to the weight ratio of 1: 0.008, adding into a double-screw extruder through a feeding port, extruding, cooling and cutting into particles by a cutter; the specific process for processing the double-screw extruder comprises the following steps: the first-stage temperature is 140 ℃, the second-stage temperature is 160 ℃, the third-stage temperature is 170 ℃, the fourth-stage temperature is 165 ℃ and the rotating speed is 70 r/min;
    the organic silicon microsphere @ cerium dioxide composite microsphere is obtained by the following method: weighing 0.8g of organic silicon microspheres, dispersing in 60mL of absolute ethyl alcohol, and mechanically dispersing to obtain a dispersion liquid A; dispersing 0.6g of cerous nitrate hexahydrate and 1.0g of hexamethylenetetramine in 50mL of deionized water, and mechanically dispersing to obtain a dispersion liquid B; mixing the dispersion A and the dispersion B, and stirring and reacting at 70 ℃ at 130 revolutions per minute for 2 hours; centrifuging the reaction solution at 3000 rpm for 10 minutes, and collecting the precipitate; drying the precipitate at 70 ℃ for 2 hours, and calcining at 400 ℃ for 3 hours to obtain the organic silicon microsphere @ cerium dioxide composite microsphere;
    the organic silicon microsphere is obtained by the following method: mixing vinyl trimethoxy silane and deionized water according to a molar ratio of 1: 16, adjusting the pH value of the solution to 5 by adopting phosphoric acid with the mass fraction of 10%, and stirring and reacting for 1 hour at the temperature of 20 ℃ at the speed of 130 r/min; then adding ammonia water with the mass fraction of 25%, adjusting the pH value to 8, and stirring and reacting at 20 ℃ at 130 r/min for 4 hours; after the reaction is finished, filtering the reaction solution by using 200-mesh filter cloth, and collecting a filter cake; washing the filter cake with water with the weight of 80 times that of the filter cake, and drying for 8 hours at the temperature of 100 ℃ and the vacuum degree of 0.07MPa to obtain the organic silicon microspheres;
    the preparation method of the nano particle reinforced PMMA plastic comprises the following steps: mixing inorganic particles with methyl methacrylate, wherein the inorganic particles account for 10% of the mass of the methyl methacrylate, and the inorganic particles are cellulose nanoparticles and 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide in a mass ratio of 1: 0.7, performing ultrasonic treatment for 20 minutes at 20 ℃, the ultrasonic power of 350W and the ultrasonic frequency of 20kHz to obtain a dispersion liquid; standing the dispersion liquid at 20 ℃ for 24 hours, continuing to perform ultrasonic treatment for 20 minutes under the conditions of 20 ℃, ultrasonic power of 350W and ultrasonic frequency of 20kHz, adding azobisisobutyronitrile with the mass of 0.03 time of methyl methacrylate, reacting at 70 ℃ under the protection of nitrogen until the system viscosity reaches 0.9 Pa.s, and stopping the reaction; drying the reaction solution at 40 ℃ for 24 hours, and then drying at 100 ℃ for 2 hours to obtain the PMMA-cellulose nano particle hybrid material;
    preparing 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide: dispersing zirconium dioxide in 3- (trimethoxysilyl) propyl methacrylate and tetrahydrofuran in a molar ratio of 0.2: 1, the zirconium dioxide accounts for 1.5 percent of the mass of the mixed solution to obtain a dispersion liquid; carrying out ultrasonic treatment on the dispersion liquid for 20 minutes under the conditions of 20 ℃, ultrasonic power of 350W and ultrasonic frequency of 20kHz, standing for 24 hours at 60 ℃, adding methanol which is 0.09 times of the volume of the dispersion liquid, and precipitating; centrifuging at 3000 rpm for 15 min, and taking the bottom solid; drying the bottom solid for 12 hours at the temperature of 50 ℃ and the vacuum degree of 0.07MPa to obtain the 3- (trimethoxysilyl) propyl methacrylate modified nano zirconium dioxide;
    preparing the cellulose nano-particles: microcrystalline cellulose and concentrated sulfuric acid with the mass fraction of 98% are mixed according to the proportion of 1: 8(g/mL), stirring at 40 ℃ for 1 hour at 120 revolutions per minute, and diluting the mixed solution by 5 times with water to obtain a suspension; centrifuging the suspension at 12000 r/min for 15 min, and collecting precipitate; the precipitate and distilled water were mixed in a ratio of 1: 20(g/mL), homogenizing under 200Mpa for 10 min, placing into dialysis bag with relative molecular mass of 14000, and dialyzing in distilled water until pH reaches 7; and (3) carrying out vacuum freeze drying on the dialysate to obtain the cellulose nanoparticles.
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