CN111763346A - Quantum dot optical function plate, preparation method thereof and backlight module - Google Patents
Quantum dot optical function plate, preparation method thereof and backlight module Download PDFInfo
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- CN111763346A CN111763346A CN202010636217.7A CN202010636217A CN111763346A CN 111763346 A CN111763346 A CN 111763346A CN 202010636217 A CN202010636217 A CN 202010636217A CN 111763346 A CN111763346 A CN 111763346A
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Abstract
The invention provides a quantum dot optical function plate, a preparation method thereof and a backlight module, wherein the preparation method comprises the following steps: uniformly mixing a resin base material A, a resin base material B, a low-temperature foaming agent and an auxiliary agent A, and then granulating at a low temperature to obtain resin-based granules with holes; under the vacuum or protective atmosphere environment, mixing the quantum dots with the resin-based granules, then adding the high-temperature foaming agent and the auxiliary agent B, and stirring and mixing uniformly to obtain quantum dot mixed granules; mixing the quantum dot mixed granules with a resin base material A to form a quantum dot layer mixed material, and extruding and molding the quantum dot layer mixed material to obtain a single-layer quantum dot optical function board; and/or; and mixing the resin base material C and the auxiliary agent C to form a functional layer mixed material, respectively feeding the functional layer mixed material and the quantum dot layer mixed material into a plurality of extruders, and mixing, extruding and molding to obtain the multi-layer quantum dot optical functional board. The quantum dot optical function board prepared by the invention has good stability and aging resistance.
Description
Technical Field
The invention relates to the technical field of backlight and illumination, in particular to a quantum dot optical function plate, a preparation method thereof and a backlight module.
Background
The quantum dot material has the characteristics of wide excitation spectrum, narrow emission spectrum, high color purity and good light stability, but in the application process, the quantum dots can be influenced by factors such as water, oxygen, heat and the like, so that the stability of the quantum dots is poor. At present, quantum dots are added into plastic particles to prepare quantum dot plates so as to improve the protection of the quantum dots. However, the quantum dot material is still easily affected by temperature and air environment in the high-temperature processing process, and is oxidized, so that the stability is reduced, and finally, the quantum dot plate cannot well cope with various aging conditions.
Disclosure of Invention
The technical problem solved by the invention is as follows: how to improve the protection of the quantum dots in the processing process so as to obtain the quantum dot optical function plate with high stability.
In order to solve the above problems, the present invention provides a method for preparing a quantum dot optical function plate, comprising the steps of:
uniformly mixing a resin base material A, a resin base material B, a low-temperature foaming agent and an auxiliary agent A, and then granulating at a low temperature to obtain resin-based granules with holes; under the vacuum or protective atmosphere environment, mixing quantum dots with the resin-based granules to load the quantum dots in holes of the resin-based granules, then adding a high-temperature foaming agent and an auxiliary agent B, and stirring and mixing uniformly to obtain quantum dot mixed granules; mixing the quantum dot mixed granules with the resin base material A to form a quantum dot layer mixed material, and extruding and molding the quantum dot layer mixed material to obtain a single-layer quantum dot optical function board; and/or; and mixing the resin base material C and the auxiliary agent C to form a functional layer mixed material, respectively feeding the functional layer mixed material and the quantum dot layer mixed material into a plurality of extruders, and mixing, extruding and molding to obtain the multi-layer quantum dot optical functional board.
Optionally, the resin-based pellets have a pore size of 0.5-200 μm.
Optionally, the mass ratio of the resin base material A to the resin base material B is (1-20): 1.
optionally, the low temperature blowing agent comprises one or more of sodium bicarbonate, N-heptane, cyclopentane, naphtha, 2 ' -azobisisobutyronitrile, diisopropyl azodicarboxylate, azoaminobenzene, N ' -dimethyl-N, N ' -dinitrosoterephthalamide, benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, 4' -oxybis-benzenesulfonyl hydrazide, 3 ' -disulfonyl hydrazide diphenyl sulfone, and 1, 3-benzenedisulfonyl hydrazide.
Optionally, the content of the quantum dots in the quantum dot mixed granule is 0.1% -30%.
Optionally, the high temperature blowing agent comprises one or more of nitroso compounds, p-toluenesulfonylamide, 4' -oxybis-benzenesulfonylamide, trihydrazinotriazine, and 5-phenyltetrazole.
Optionally, the resin binder a comprises one or more of polyethylene, polymethylmethacrylate, polystyrene, acrylonitrile-styrene copolymer, polycarbonate, methylmethacrylate and styrene copolymer, and polyethylene terephthalate; the resin base material B comprises one or more of ethylene-vinyl acetate copolymer, polybutylene resin, polyethylene wax, methyl methacrylate and styrene copolymer, polyethylene and polypropylene; the resin base material C comprises one or more of polymethyl methacrylate, polystyrene, acrylonitrile-styrene copolymer, polycarbonate, methyl methacrylate and styrene copolymer and polyethylene terephthalate.
Optionally, the aid a comprises an antioxidant; the auxiliary agent B comprises an antioxidant, a light stabilizer and an additive, wherein the additive comprises at least one of glass fiber, nano silicon dioxide and glass beads; the auxiliary agent C comprises one or more of a solubilizer, a toughening agent, an antioxidant, a light stabilizer and a foaming agent.
Compared with the prior art, the preparation method of the quantum dot optical function plate provided by the invention has the following advantages:
the resin-based granules with holes are prepared, so that the quantum dots, the high-temperature foaming agent and the auxiliary agent are adsorbed, the loss of the quantum dots and the auxiliary material in the material mixing process can be reduced, and the dispersion uniformity of various materials in the processing process can be improved; meanwhile, as the quantum dots and the auxiliary materials enter the holes of the resin-based granules, the probability that the quantum dots are directly contacted with a high-temperature screw in the extrusion processing process can be effectively reduced, and the degree of action of shearing force is reduced, so that the performance stability of the quantum dots and the auxiliary materials is improved, and various materials in the quantum dot optical function board still have good basic performance even after being processed, and can deal with different aging conditions.
The invention also aims to provide a quantum dot optical function plate to solve the problems of poor stability and poor ageing resistance of the quantum dot plate in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the quantum dot optical function plate is prepared according to the preparation method of the quantum dot optical function plate.
The third objective of the present invention is to provide a backlight module to solve the problem of poor stability and aging resistance of the quantum dot plate in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a backlight module comprises the quantum dot optical function plate.
Compared with the prior art, the advantages of the quantum dot optical function board and the backlight module and the preparation method of the quantum dot optical function board are the same, and are not repeated herein.
Drawings
Fig. 1 is a schematic flow chart of a method for manufacturing a quantum dot optical functional plate according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a quantum dot optical function plate applied to a direct-type backlight module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a quantum dot optical functional plate applied to a lateral entrance type backside entrance optical module according to an embodiment of the present invention;
fig. 4 is a comparison of the aging performance of the quantum dot optical functional plate according to the embodiment of the present invention and the conventional quantum dot plate.
Description of reference numerals:
1-quantum dot layer, 2-diffusion layer, 3-rigid structure layer, 4-light guide layer.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that all directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture, and if the specific posture is changed, the directional indicator is changed accordingly, and the connection may be a direct connection or an indirect connection. In addition, the terms "comprising," "including," "containing," and "having" are intended to be non-limiting, i.e., that other steps and other ingredients can be added that do not affect the results. Materials, equipment and reagents are commercially available unless otherwise specified.
In addition, although the invention has described the forms of S1, S2, S3 and the like for each step in the preparation, the description is only for the convenience of understanding, and the forms of S1, S2, S3 and the like do not represent the limitation of the sequence of each step.
The quantum dot optical function board can generate pure and soft white light under the irradiation of blue light, so that the display effect of the LCD television is improved, the intensity of the blue light in backlight is reduced, and the damage of the blue light to the glasses is reduced. However, when the quantum dot optical function board is prepared, due to the air continuously introduced in the feeding process, the quantum dots, the processing aids and the resin substrate are continuously eroded by the air in the processing process, so that the quantum dot material is oxidized, the aids for protecting the quantum dots are consumed, and the resin substrate is oxidized, and the quantum dot material in the prepared quantum dot optical function board cannot stably exist under various aging conditions, thereby reducing the optical performance of the quantum dot optical function board.
In order to solve the problems, the application provides a quantum dot optical function board and a preparation method thereof, and different foaming agent materials are introduced, so that the foaming agent generates gas in the processing process to form a barrier and isolate air, the quantum dot material, the quantum dot protection additive and the resin base material have a good processing environment, and the quantum dots can be protected, so that various materials in the quantum dot optical function board still have good basic performance even after being processed, and can cope with different aging conditions.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, an embodiment of the present invention provides a method for manufacturing a quantum dot optical functional plate, including:
s1, uniformly mixing the resin base material A, the resin base material B, the low-temperature foaming agent and the auxiliary agent A, and then granulating at low temperature to obtain resin-based granules with holes;
s2, mixing the quantum dots and the resin-based granules under a vacuum or protective atmosphere environment to load the quantum dots in the holes of the resin-based granules, then adding a high-temperature foaming agent and an auxiliary agent B, and uniformly stirring and mixing to obtain quantum dot mixed granules;
s3, mixing the quantum dot mixed granules with the resin base material A to form a quantum dot layer mixed material, and extruding and molding the quantum dot layer mixed material to obtain a single-layer quantum dot optical function board; and/or; and mixing the resin base material C and the auxiliary agent C to form a functional layer mixed material, respectively feeding the functional layer mixed material and the quantum dot layer mixed material into a plurality of extruders, and performing extrusion molding to obtain the multilayer quantum dot optical functional board.
Wherein the resin base material A comprises one or more of polyethylene PE, polymethyl methacrylate PMMA, polystyrene PS, acrylonitrile-styrene copolymer AS, polycarbonate PC, methyl methacrylate and styrene copolymer MS and polyethylene terephthalate PET.
The resin base material B comprises one or more of ethylene-vinyl acetate copolymer EVA, polybutylene resin PB, polyethylene wax, methyl methacrylate and styrene copolymer MS, polyethylene PE and polypropylene PP.
The resin base material C comprises one or more of polyethylene PE, polymethyl methacrylate PMMA, polystyrene PS, acrylonitrile-styrene copolymer AS, polycarbonate PC, methyl methacrylate and styrene copolymer MS and polyethylene terephthalate PET.
It is understood that the resin binder a is the main base material of the quantum dot optical functional plate; the resin base material B mainly has the effects of being mixed with the resin base material A for processing, reducing the processing temperature of the resin base material A, carrying out a relatively low-temperature granulation process, protecting the resin base material A, and avoiding the aging phenomenon caused by repeated processing of the resin base material A after the resin base material A is subjected to high-temperature granulation and then is processed into a plate; the resin base material C is mainly a resin base material of the functional layer, and different materials are selected according to functional requirements.
In step S1, the resin base B is an auxiliary material, and the overall granulation temperature of the resin base a can be reduced by blending the resin base B with the resin base a. In the embodiment of the present invention, the low-temperature granulation method is a low-temperature granulation process commonly used in the prior art, and will not be described in detail herein, wherein the temperature of the low-temperature granulation is 150-.
If the resin base material B is not added, the resin base material A needs to be subjected to high-temperature granulation and then participate in the subsequent high-temperature processing process of extruding and manufacturing the plate, and mechanical shearing and air can accelerate the aging of the resin material in the repeated high-temperature processing process of the resin, so that the basic performance of the resin material is influenced. Therefore, by adding the resin base material B and reducing the granulation temperature in the step S1, the protection of the resin base material A can be improved to a certain extent, the influence of air and mechanical shearing on the resin base material is reduced, and the performance of the prepared quantum dot optical function board is improved. In the embodiment of the present invention, it is preferable that the mass ratio of the resin base a to the resin base B is (1 to 20): 1.
meanwhile, due to the addition of the low-temperature foaming agent, in the low-temperature granulation process, the foaming agent generates gas, so that holes appear in the resin base material, resin base material granules with hole structures can be prepared, and the number and the size of the holes in the resin base material granules can be adjusted through the type and the using amount of the foaming agent. In an embodiment of the invention, the low temperature blowing agent comprises sodium bicarbonate, n-heptane, cyclopentaneOne or more of naphtha, 2 ' -azobisisobutyronitrile, diisopropyl azodicarboxylate, azoaminobenzene, N ' -dimethyl-N, N ' -dinitrosoterephthalamide, benzenesulfonylhydrazide, p-toluenesulfonylhydrazide, 4' -oxybis-benzenesulfonylhydrazide, 3 ' -disulfonylhydrazide diphenylsulfone, and 1, 3-benzenedisulfonylhydrazide; the mass of the low-temperature foaming agent accounts for 0.1-20% of the total mass of the resin base material A and the resin base material B; the obtained resin-based pellets have a pore size of 0.5-200 μm and a density of 0.1-1.0g/cm3。
The auxiliary agent A comprises an antioxidant which is used for delaying or inhibiting the oxidation process of the resin base material, thereby preventing the aging of the polymer and prolonging the service life of the polymer. Wherein the antioxidant comprises dibutyl hydroxy toluene, tert-butyl hydroquinone, dilauryl thiodipropionate, pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], N-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, N '-bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine, tris [2, 4-di-tert-butylphenyl ] phosphite, 4' -thiobis (6-tert-butyl-3-methylphenol), isooctyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, distearyl pentaerythritol diphosphite and diethylene glycol bis beta- (3-tert-butyl-4-hydroxy-5- One or more of methylphenyl) -propionate.
In step S2, stirring and mixing the quantum dots and the resin-based granules prepared in step S2 uniformly in vacuum or in the presence of inert shielding gas, so that the resin-based granules with holes can fully adsorb the quantum dot material, wherein the content of the quantum dots in the quantum dot mixed granules is 0.1-30%; and then adding a high-temperature foaming agent and an auxiliary agent B into the mixture, stirring and mixing, and allowing the hole granules of the resin-based granules to continuously adsorb the auxiliary material to form the quantum dot mixed granules, wherein the stirring and mixing temperatures are 0-80 ℃. The mode of adding in batches like this can avoid high temperature foaming agent and auxiliary agent B and quantum dot to adsorb each other in mixing process and glue, becomes large granule powder, can't effectively get into inside the hole.
Therefore, the resin-based granules with holes are prepared, so that the quantum dots, the high-temperature foaming agent and the auxiliary agent B are adsorbed, the loss of the quantum dots and the auxiliary material in the material mixing process can be reduced, and the dispersion uniformity of various materials in the processing process can be improved; meanwhile, as the quantum dots and the auxiliary materials enter the holes of the resin-based granules, the probability that the quantum dots are directly contacted with a high-temperature screw in the extrusion processing process can be effectively reduced, and the degree of action of shearing force is reduced, so that the performance stability of the quantum dots and the auxiliary materials is improved.
In addition, the high-temperature foaming agent comprises one or more of nitroso compounds, p-toluenesulfonyl semicarbazide, 4' -oxybis-benzenesulfonyl semicarbazide, trihydrazino triazine and 5-phenyltetrazole, and the mass of the high-temperature foaming agent is 0.1-10% of that of the quantum dot granules.
Through adding high temperature foaming agent, make the quantum dot aggregate in extruder high temperature course of working, the foaming agent receives the high temperature influence, produce inert gas, form the gas barrier, the protection quantum dot does not receive the influence of air in the course of working, weaken the high mechanical shearing of screw rod to the influence of quantum dot material, the quantum dot board optical function board that the while processed out like this has hollow structure, this hollow structure not only can diffuse the atomizing light source, the high-purity light that the homogenization quantum dot sent, can also reduce the density of quantum dot optical function board, more make things convenient for the transportation equipment.
The content of the quantum dots in the quantum dot mixed granules is 0.1-30%, the quantum dots are oil-soluble quantum dots, and can be selected from any one of first compounds formed by elements in II main groups and VI main groups, any one of second compounds formed by elements in III main groups and V main groups in the periodic table of elements, core-shell structure compounds formed by coating of multiple kinds of the first compounds and/or the second compounds or doped nanocrystals; wherein the first compound comprises: CdSe, CdTe, MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe, BaS, BaSe, BaTe, ZnS, ZnSe, ZnTe and CdS; the second compound includes: GaN, GaP, GaAs, InN, InP, and InAs.
The quantum dots have wide excitation spectrum and are continuously distributed, and the quantum dots are excited by incident light to generate excited light so as to be mixed with the incident light to form emergent light, so that the emergent light has the advantage of high color gamut. In the embodiment of the invention, the quantum dots comprise green quantum dots with the wavelength of 500-550nm and red quantum dots with the wavelength of 600-650 nm; the green quantum dots and the red quantum dots respectively generate green light and red light under the excitation of the blue light laser source, and the blue light laser, the green light and the red light can be synthesized into high-color-gamut white light. Of course, in other embodiments, quantum dots of other wavelengths and colors may be used according to actual needs.
The state of the quantum dots may be paste, powder or solution, and in the embodiment of the present invention, the quantum dots are preferably in solution for easy adsorption into the pores.
The auxiliary agent B comprises an antioxidant, a light stabilizer and an additive, wherein the antioxidant is the same as the antioxidant contained in the auxiliary agent A; light stabilizers include bis-2, 2,6, 6-tetramethylpiperidinol sebacate, polymers of succinic acid with 4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidinol, 2- (2H-benzotriazol-2-yl) -4- (1,1,3, 3-tetramethylbutyl) phenol, 2- (2-hydroxy-5-methyl-phenyl) -2H-benzotriazole, 2-hydroxy-4-n-octoxybenzophenone, 2- (2H-benzotriazol-2-yl) -4, 6-bis (1-methyl-1-phenylethyl) -phenol, and 2- (5-chloro-2H-benzotriazol-2-yl) -6- (1, 1-dimethylethyl) -4-methylphenol.
The additive comprises at least one of glass fiber, nano silicon dioxide and glass beads, and the mass of the additive accounts for 0.1-10% of the mass of the quantum dot granules.
In step S3, the quantum dot mixed pellet is mixed with the resin base a to form a quantum dot layer mixture, and the quantum dot layer mixture is extrusion-molded in a multi-sheet extrusion apparatus, whereby a quantum dot optical functional sheet having a quantum dot layer can be obtained. And in addition, mixing the resin base material C and the auxiliary agent C to form a functional layer mixed material, adding the functional layer mixed material into an extruding device in multi-sheet extrusion, compounding the molten quantum dot layer mixed material and the molten functional layer mixed material in a die, and extruding the compound through a discharge port of the die to form the multi-layer quantum dot plate comprising the quantum dot layer and the functional layer. That is, by adding different base materials to the extruder, different quantum dot optical function plates can be made, such as: the quantum dot multilayer chip comprises a single-layer quantum dot layer board, a multilayer board formed by multiple quantum dot layers, and also can be a multilayer board formed by combining a quantum dot layer and a functional layer. Wherein the processing temperature of extrusion molding is 150-350 ℃.
As the quantum dot mixed granules forming the quantum dot layer comprise the high-temperature foaming agent, the foaming agent is uniformly decomposed to release gas in the processing process, the gas forms a cavity loose structure in the molten resin base material, and the quantum dots are distributed in the resin base material. The cavity loose structure can diffuse light on one hand, plays a role in concealing and homogenizing light, reduces the use of a diffusing agent and other concealing additives, and reduces the cost for manufacturing the quantum dot optical functional board; on the other hand, the cavity loose structure can reduce the heat-conducting property of the resin base material, reduce the influence of the external environment on the quantum dot material and improve the luminous property of the quantum dot optical function board; in addition, the light weight degree of the plate can be improved, and the light and thin of the backlight module can be better realized.
Therefore, specific resin base materials and auxiliary agents can be selected according to functions required by the plate, such as better strength, better diffusion and concealing properties, light guide property and the like, so that the quantum dot optical function plate has more functions, and more use scenes are met.
Wherein the auxiliary agent C comprises one or more of a solubilizer, a flexibilizer, an antioxidant, a light stabilizer and a foaming agent. The solubilizer comprises one or more of styrene-maleic anhydride (maleic anhydride) copolymer SMA, polystyrene HIPS, methyl methacrylate and styrene copolymer MS and styrene block copolymer SBS; the toughening agent comprises one or more of glass fiber, nano silicon dioxide, polystyrene HIPS, styrene block copolymer SBS, methacrylic acid-butadiene-styrene copolymer MBS, acrylonitrile-butadiene-styrene copolymer) ABS and ethylene-vinyl acetate copolymer EVA.
The preparation method of the quantum dot optical function board provided by the embodiment of the invention comprises the steps of firstly preparing resin-based granules with holes, then loading quantum dots and an auxiliary agent in the holes of a resin base material, and then carrying out extrusion molding to obtain the quantum dot optical function board; the preparation method has the advantages of simple operation process, low equipment cost and high experimental repeatability, and is beneficial to industrial large-scale production and popularization.
The embodiment of the invention also provides a quantum dot optical function plate, and the quantum dot optical function plate is prepared according to the preparation method of the quantum dot optical function plate. The quantum dot optical function plate may include a single quantum dot layer, a multi-layered quantum dot layer, and a quantum dot layer and function layer combining structure; the functional layer comprises a light diffusion layer, a rigid structure layer, a light guide layer and the like, and can be customized according to actual needs. Wherein, the density of the quantum dot optical function board is as follows: 0.1-1.5g/cm3。
For example, in a direct-type backlight module and a side-type backlight module, due to the difference of the positions of incident light sources, the required optical function plates have different performances.
Fig. 2 is a schematic structural diagram of a quantum dot optical function plate applied to a direct-type backlight module, where the quantum dot optical function plate shown in fig. 2 (a) includes a quantum dot layer 1, the quantum dot optical function plate shown in fig. 2 (b) includes a quantum dot layer 1 and a light diffusion layer 2 attached to each other, the quantum dot optical function plate shown in fig. 2 (c) includes a quantum dot layer 1 and a rigid structure layer 3 attached to each other, the quantum dot optical function plate shown in fig. 2 (d) includes a quantum dot layer 1 and light diffusion layers 2 respectively disposed on upper and lower surfaces of the quantum dot layer 1, and the quantum dot optical function plate shown in fig. 2 (e) includes a quantum dot layer 1 and a rigid structure layer 3 and a light diffusion layer 2 respectively disposed on upper and lower surfaces of the quantum dot layer 1. The direct type backlight module is characterized in that a light source (an LED chip array) and a PCB are arranged at the bottom of a backlight source, light rays are uniformly emitted through a quantum dot optical function plate after being emitted from an LED, and a light guide plate is not needed. Therefore, as can be seen from fig. 2, the quantum dot optical functional plate may be a single quantum dot layer 1, and functional layers such as a diffusion layer 2 and a rigid structure layer 3 may be bonded to the upper surface and/or the lower surface of the quantum dot layer 1, and the specific positions of these functional layers may be set arbitrarily.
Fig. 3 is a schematic structural diagram of a quantum dot optical function plate applied to a lateral backlight module, wherein the quantum dot optical function plate shown in (a) in fig. 3 includes a quantum dot layer 1 and a light guide layer 4 attached to each other, the quantum dot optical function plate shown in (b) in fig. 3 includes the quantum dot layer 1 and a rigid structure layer 3 and a light guide layer 4 respectively disposed on the upper and lower surfaces of the quantum dot layer 1, and the quantum dot optical function plate shown in (c) in fig. 3 includes the quantum dot layer 1 and a light diffusion layer 2 and a light guide layer 4 respectively disposed on the upper and lower surfaces of the quantum dot layer 1. It can be seen from the figure that the edge-lit backlight module is a backlight source made by arranging linear or point-like light sources on the side of a specially designed light guide plate, that is, the LED light sources need to be arranged on the side of the light guide plate, and at the same time, dots are formed on the bottom surface of the light guide plate, and light emitted by the LED package enters the quantum dot optical function plate and is transmitted to the liquid crystal screen direction through reflection and scattering. Therefore, as can be seen from fig. 3, the quantum dot optical function board may include a quantum dot layer 1 and a light guide layer 4, or the quantum dot layer 1, the light guide layer 4, a rigid structure layer 3 and/or a diffusion layer 2, where the light guide layer 4 and the rigid structure layer 3 (or the diffusion layer 2) are respectively disposed on two sides of the quantum dot layer 1, so as to ensure that the light guide layer 4 can uniformly convert a line light source into a surface light source, guide the scattering direction of light, and implement the application of the quantum dot optical function board in the lateral backlight module.
The quantum dot layer 1 may be a single-layer yellow quantum dot layer formed by mixing yellow and green quantum dots, or two quantum dot layers respectively including red quantum dots and green quantum dots, so as to adapt to different application scenarios and improve the color gamut.
Wherein, the light transmittance of the quantum dot layer 1 is 30-90%, the light transmittance of the diffusion layer 2 is 30-80%, the light transmittance of the rigid structure layer 3 is 50-95%, and the light transmittance of the light guide layer 4 is 70-95%; the thicknesses of the quantum dot layer 1, the diffusion layer 2, the rigid structure layer 3 and the light guide layer 4 are all 0.1-2 mm.
Another embodiment of the present invention further provides a backlight module, which includes the quantum dot optical function plate as described above. Blue light emitted by the backlight source enters the quantum dot optical function board to excite red light and green light, and finally emergent light formed by mixing blue light laser, green light and red light enters the display panel, so that the color gamut and the brightness are higher, and the display effect is favorably improved.
The invention will be further illustrated with reference to the following specific examples. The quantum dot selected in the following embodiment of the invention is CdSe, the resin base material A is polystyrene PS, the resin base material B is polyethylene wax, the low-temperature foaming agent is naphtha, the auxiliary agent A is pentaerythritol dioctadecyl diphosphite, the high-temperature foaming agent is p-toluenesulfonyl semicarbazide, the auxiliary agent B is pentaerythritol dioctadecyl diphosphite, sebacic acid di-2, 2,6, 6-tetramethylpiperidinol ester and nano-silica, the resin base material C is polycarbonate PC, and the auxiliary agent C is styrene-maleic anhydride copolymer SMA.
It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are examples of experimental procedures not specified under specific conditions, generally according to the conditions recommended by the manufacturer. Unless otherwise indicated, percentages and parts are by mass.
Example 1
The embodiment provides a preparation method of a quantum dot optical function plate, which comprises the following specific steps:
1) uniformly mixing a resin base material A, a resin base material B, a low-temperature foaming agent and an auxiliary agent A, and granulating at 160 ℃, wherein the mass ratio of the resin base material A to the resin base material B is 5: 1, obtaining resin-based granules with holes;
2) under vacuum, mixing the quantum dots with the resin-based granules to load the quantum dots in the holes of the resin-based granules, then adding a high-temperature foaming agent and an auxiliary agent B, and uniformly stirring and mixing at 40 ℃ to obtain quantum dot mixed granules, wherein the content of the quantum dots in the quantum dot mixed granules is 5%;
3) and mixing the quantum dot mixed granules with the resin base material A to form a quantum dot layer mixed material, and extruding and molding the quantum dot layer mixed material, wherein the processing temperature is 210 ℃, so that a single-layer quantum dot optical function board B is obtained.
Example 2
The embodiment provides a preparation method of an existing quantum dot plate, which is a comparative example of embodiment 1 and specifically comprises the following steps:
and (2) directly stirring and mixing the quantum dots and the PS blank granules, adding the mixture into an extruder, and performing extrusion molding to obtain a quantum dot plate A, wherein the processing temperature of the extruder is 210 ℃.
Referring to FIG. 4, the quantum dot optical functional plate B and the quantum dot plate A were placed at 40 deg.C, 85% humidity and 38W/m luminous power2The aging performance is compared with the aging performance obtained by tracking the brightness value of the quantum dot plate by using a color analyzer under the condition of blue light with the wavelength of 450nm, and as can be seen from figure 4, the anti-aging performance of the quantum dot optical function plate provided by the invention is far higher than that of the existing quantum dot plate.
Example 3
This example differs from example 1 in that:
granulating at 150 ℃ in step 1), wherein the mass ratio of the resin base material A to the resin base material B is 1: 1;
in the step 2), stirring and mixing uniformly at 0 ℃ to obtain quantum dot mixed granules, wherein the content of quantum dots in the quantum dot mixed granules is 0.1%;
in the step 3), the processing temperature is 150 ℃;
the other steps and parameters were the same as in example 1.
Example 4
This example differs from example 1 in that:
granulating at the temperature of 250 ℃ in the step 1), wherein the mass ratio of the resin base material A to the resin base material B is 20: 1;
in the step 2), stirring and mixing uniformly at 80 ℃ to obtain quantum dot mixed granules, wherein the content of the quantum dots in the quantum dot mixed granules is 30%;
in the step 3), the processing temperature is 350 ℃;
the other steps and parameters were the same as in example 1.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A method for preparing a quantum dot optical function plate is characterized by comprising the following steps:
uniformly mixing a resin base material A, a resin base material B, a low-temperature foaming agent and an auxiliary agent A, and then granulating at a low temperature to obtain resin-based granules with holes;
under the vacuum or protective atmosphere environment, mixing quantum dots with the resin-based granules to load the quantum dots in holes of the resin-based granules, then adding a high-temperature foaming agent and an auxiliary agent B, and stirring and mixing uniformly to obtain quantum dot mixed granules;
mixing the quantum dot mixed granules with the resin base material A to form a quantum dot layer mixed material, and extruding and molding the quantum dot layer mixed material to obtain a single-layer quantum dot optical function board; and/or; and mixing the resin base material C and the auxiliary agent C to form a functional layer mixed material, respectively feeding the functional layer mixed material and the quantum dot layer mixed material into a plurality of extruders, and mixing, extruding and molding to obtain the multi-layer quantum dot optical functional board.
2. The method for producing a quantum dot optical functional plate according to claim 1, wherein the size of the pores of the resin-based pellets is 0.5 to 200 μm.
3. The method for preparing a quantum dot optical functional plate according to claim 1, wherein the mass ratio of the resin base material a to the resin base material B is (1-20): 1.
4. the method of claim 2, wherein the low-temperature foaming agent comprises one or more of sodium bicarbonate, N-heptane, cyclopentane, naphtha, 2 ' -azobisisobutyronitrile, diisopropyl azodicarboxylate, azoaminobenzene, N ' -dimethyl-N, N ' -dinitrosoterephthalamide, benzenesulfonylhydrazide, p-toluenesulfonylhydrazide, 4' -oxybis-benzenesulfonylhydrazide, 3 ' -disulfonylhydrazide diphenylsulfone, and 1, 3-benzenedisulfonylhydrazide.
5. The method for preparing a quantum dot optical functional plate according to any one of claims 1 to 4, wherein the content of the quantum dots in the quantum dot mixed pellet is 0.1% to 30%.
6. The method of claim 5, wherein the high temperature blowing agent comprises one or more of nitroso compounds, p-toluenesulfonyl semicarbazide, 4' -oxybis-benzenesulfonyl semicarbazide, trihydrazinotriazine, and 5-phenyltetrazole.
7. The method for preparing a quantum dot optical functional plate according to any one of claims 1 to 4, wherein the resin binder A comprises one or more of polyethylene, polymethyl methacrylate, polystyrene, acrylonitrile-styrene copolymer, polycarbonate, methyl methacrylate and styrene copolymer, and polyethylene terephthalate;
the resin base material B comprises one or more of ethylene-vinyl acetate copolymer, polybutylene resin, polyethylene wax, methyl methacrylate and styrene copolymer, polyethylene and polypropylene;
the resin base material C comprises one or more of polypropylene, polymethyl methacrylate, polystyrene, acrylonitrile-styrene copolymer, polycarbonate, methyl methacrylate and styrene copolymer and polyethylene terephthalate.
8. The method for preparing a quantum dot optical functional plate according to claim 7, wherein the auxiliary agent A comprises an antioxidant; the auxiliary agent B comprises an antioxidant, a light stabilizer and an additive, wherein the additive comprises at least one of glass fiber, nano silicon dioxide and glass beads; the auxiliary agent C comprises one or more of a solubilizer, a toughening agent, an antioxidant, a light stabilizer and a foaming agent.
9. A quantum dot optical functional plate, characterized in that it is produced according to the method for producing a quantum dot optical functional plate according to any one of claims 1 to 8.
10. A backlight module comprising the quantum dot optical functional plate according to claim 9.
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Denomination of invention: A quantum dot optical functional board and its preparation method, backlight module Granted publication date: 20210730 Pledgee: Industrial and Commercial Bank of China Limited Guangzhou Development Zone Branch Pledgor: Guangna Jiayuan (Guangzhou) Technology Co.,Ltd. Registration number: Y2024980014461 |