CN114524996B - Quantum dot diffusion plate with high brightness shielding and low deformation, and preparation method and application thereof - Google Patents
Quantum dot diffusion plate with high brightness shielding and low deformation, and preparation method and application thereof Download PDFInfo
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- CN114524996B CN114524996B CN202210103403.3A CN202210103403A CN114524996B CN 114524996 B CN114524996 B CN 114524996B CN 202210103403 A CN202210103403 A CN 202210103403A CN 114524996 B CN114524996 B CN 114524996B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
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Abstract
The invention discloses a quantum dot diffusion plate with high brightness shielding and low deformation, and a preparation method and application thereof. The quantum dot diffusion plate comprises the following components in parts by weight: 100 parts of resin base material, 5-20 parts of glass fiber, 0.1-1 part of quantum dot, 0.2-1 part of weather-proof agent, 0.3-2 parts of antioxidant and 1-2 parts of lubricant; the refractive index of the glass fiber is 1.4-1.58, and the average diameter is 7-17 mu m. According to the invention, glass fibers with specific refractive indexes and diameters are selected as light diffusion media, and are introduced into the diffusion plate, and the quantum dot technology is combined, so that the linear expansion coefficient of the quantum dot light diffusion plate can be remarkably reduced, the deformation resistance is improved, and the quantum dot diffusion plate has higher brightness and haze value.
Description
Technical Field
The invention relates to the technical field of display and illumination, in particular to a quantum dot diffusion plate with highlight shielding and low deformation, and a preparation method and application thereof.
Background
The light diffusion plate is a physical phenomenon of refraction, reflection and scattering when light encounters two mediums with different refractive indexes in the middle of the path of the light by chemical or physical means, and the light diffusion agent is added into the transparent resin base material, so that the light path is changed, and the effect of fully dispersing the incident light to generate optical diffusion is realized.
The quantum dot material has the characteristics of wide excitation spectrum, narrow emission spectrum, high color purity and good light stability, and can improve the optical performance of the diffusion plate. The quantum dot diffusion plate combines the quantum dot technology and the light diffusion plate technology, and has excellent optical display effect.
The quantum dot diffusion plate on the market at present is mainly prepared by the following methods: (1) The quantum dots are printed on the diffusion plate by adopting a printing method, but the printing and manufacturing process is extremely complex and difficult to apply to industrial continuous production; (2) The quantum dot film is used in combination with a common diffusion plate or is coated by adopting a coextrusion method, but for large-size display equipment, the problem of display distortion caused by inconsistent linear expansion coefficients of the quantum dot film and the diffusion plate is easy to occur.
At present, display equipment is thinner and bigger, the size is bigger and bigger, the size of a corresponding diffusion plate is bigger and bigger, and the diffusion plate of the quantum dot with bigger size is easy to be deformed due to expansion caused by insufficient deformation resistance, so that display is problematic. The requirement for deformation of the diffusion plate is also higher and higher, and besides the high brightness and high haze, the quantum dot diffusion plate is also required to have excellent deformation resistance.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the high-brightness shielding low-deformation quantum dot diffusion plate, which combines transparent glass fiber with a refractive index within a certain range with quantum dot master batches, introduces the transparent glass fiber into the diffusion plate, and takes the glass fiber as a light diffusion medium, so that the quantum dot diffusion plate has excellent deformation resistance, high brightness and high haze.
Another object of the present invention is to provide a method for preparing the quantum dot diffusion plate.
Another object of the present invention is to provide an application of the quantum dot diffusion plate.
In order to solve the technical problems, the invention adopts the following technical scheme:
the high-brightness shielding and low-deformation quantum dot diffusion plate comprises the following components in parts by weight:
100 parts of a resin base material, and,
5-18 parts of glass fiber,
0.1 to 1 part of quantum dot,
0.2 to 1 part of weather-proof agent,
0.3 to 2 parts of antioxidant,
1-2 parts of lubricant;
the refractive index of the glass fiber is 1.4-1.58, and the average diameter is 7-17 mu m.
The inventor researches and discovers that the glass fiber is selected as a light diffusion medium, and is introduced into the diffusion plate, and the linear expansion coefficient and deformation resistance of the quantum dot light diffusion plate can be obviously reduced by combining the quantum dot technology, so that the large-size quantum dot diffusion plate has excellent dimensional stability and is not easy to deform.
In the quantum dot diffusion plate, glass fiber is used as a deformation resistance improving auxiliary agent and also is used as a light diffusion medium. Under the conditions that the refractive index of the glass fiber is 1.4-1.58 and the average diameter is 7-17 mu m, the addition of the glass fiber can ensure that the quantum dot diffusion plate keeps high brightness and high haze.
The brightness and haze in the quantum dot diffusion plate have a relationship of mutual confinement and influence. Since the refractive index of the transparent resin substrate is generally about 1.59, the refractive index of the glass fiber is generally less than 1.59. When the refractive index of the glass fiber is close to that of the resin base material or the diameter is too large, the refractive effect on light is poor, so that the haze value is low, but the brightness of the quantum dot diffusion plate is improved; the refractive index of the glass fiber is far from the resin base material (i.e., the refractive index is too small), or the diameter is too small, the refractive effect on the optics is good, the haze value is high, but the luminance of the quantum dot diffusion plate is deteriorated.
The inventor discovers through a large number of creative experiments that the glass fiber only has higher brightness and haze when the refractive index and the average diameter are in the range.
Preferably, the glass fiber has a refractive index of 1.50 to 1.57.
Preferably, the glass fibers have an average diameter of 8 to 15 μm.
When the brightness and the haze of the quantum dot diffusion plate are comprehensively considered, and the glass fiber has the refractive index of 1.50-1.57 and the average diameter of 8-15 mu m, the comprehensive performance of the quantum dot diffusion plate is relatively better.
Further preferably, the glass fibers have an average diameter of 11 to 13 μm.
Preferably, the content of the glass fiber is 8 to 15 parts by weight. Within this range, the quantum dot diffusion plate has both superior brightness and haze.
Preferably, the weather resistant agent is one or more of hindered amine weather resistant agents, benzotriazole weather resistant agents, benzophenone weather resistant agents, triazine weather resistant agents and salicylate weather resistant agents.
Preferably, the antioxidant is one or more of hindered phenol antioxidants, phosphite antioxidants, metal alkyl thiophosphoric acid antioxidants, carbamic acid antioxidants and organic sulfur antioxidants.
Preferably, the lubricant is one or more of vinyl bis-stearamide, polysiloxane, stearate, PE wax, PP wax, or ethylene bis-stearamide.
The quantum dots are alloy materials composed of two or more than two of Cd, zn, se, S, in, P. Preferably, the quantum dots are one or more of CdZnSeS, cdZnSe, cdZnS, inZnP.
Preferably, the organic solvent is one or more of styrene, toluene, cyclohexane, n-hexane, ethanol, methanol, isopropanol, acetone, ethyl acetate, anisole or tetrahydrofuran.
Preferably, the resin substrate is one or more of polystyrene (GPPS), polymethyl methacrylate (PMMA), styrene-polymethyl methacrylate copolymer (MS) or Polycarbonate (PC).
More preferably, the resin substrate is GPPS.
The invention also provides a preparation method of the quantum dot diffusion plate, which comprises the following steps:
s1, dissolving quantum dots and part of resin base material in an organic solvent, uniformly mixing, heating and stirring in a vacuum environment, and removing the solvent to obtain a solid product, namely quantum dot master batch;
s2, mixing the rest resin base material, the quantum dot master batch prepared in the step S1, glass fiber, a weather-proof agent, an antioxidant and a lubricant, adding the mixture into an extruder, and carrying out melt mixing and extrusion molding to obtain the quantum dot diffusion plate.
Preferably, in step S1, the mass ratio of the quantum dots to the part of the resin substrate is (3-5): 100.
preferably, in step S1, the organic solvent is one or more of styrene, toluene, cyclohexane, n-hexane, ethanol, methanol, isopropanol, acetone, ethyl acetate, anisole or tetrahydrofuran.
More preferably, in step S1, the organic solvent is styrene and/or toluene.
Preferably, in step S1, the temperature of the heating and stirring is 50 to 70 ℃.
Preferably, in step S2, the extruder is a single screw extruder.
Preferably, in the step S2, the temperature of the head of the single screw extruder is 165-185 ℃, the temperature of the first area of the machine body is 150-160 ℃, the temperature of the second area of the machine body is 165-175 ℃, the temperature of the third area of the machine body is 170-185 ℃, the temperature of the fourth area of the machine body is 175-180 ℃, and the screw rotating speed is 18-22 rpm.
The invention also protects the application of the quantum dot diffusion plate in preparing large-size display equipment.
Preferably, the large-size display device is larger than or equal to 65 inches in size.
Compared with the prior art, the invention has the beneficial effects that:
the invention develops a quantum dot diffusion plate with high brightness shielding and low deformation. By selecting glass fiber with refractive index of 1.4-1.58 and average diameter of 7-17 μm as light diffusion medium and introducing the glass fiber into the diffusion plate, and combining quantum dot technology, the linear expansion coefficient of the quantum dot light diffusion plate can be obviously reduced, and the deformation resistance is improved, so that the large-size quantum dot diffusion plate has excellent dimensional stability, is not easy to deform, and has higher brightness and haze value. The linear expansion coefficient of the quantum dot diffusion plate is less than or equal to 50 mu m/(m.DEG C), the brightness is more than or equal to 3900cd, and the haze is more than or equal to 90%.
Detailed Description
The invention is further described below in connection with the following detailed description.
The starting materials in the examples, i.e., comparative examples, are all commercially available;
the weathering agent, antioxidant and lubricant used in the parallel examples and comparative examples are the same.
Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Examples 1 to 16
Examples 1-16 respectively provide a quantum dot diffusion plate, the component content is shown in table 1, and the preparation method is as follows:
s1, dissolving quantum dots and part of resin base material in an organic solvent (styrene), uniformly mixing, and heating and stirring in a vacuum environment to remove the solvent to obtain a solid product, namely quantum dot master batch;
wherein the mass ratio of the quantum dots to the partial resin base material is 5:100;
s2, mixing the rest resin base material, the quantum dot master batch prepared in the step S1, glass fiber, a weather-proof agent, an antioxidant and a lubricant, adding the mixture into a single screw extruder, and carrying out melt mixing and extrusion molding to obtain a quantum dot diffusion plate with the size specification of 85 inches and the thickness of 1.5mm;
wherein the temperature of the head of the single screw extruder is 165-185 ℃, the temperature of the first area of the machine body is 150-160 ℃, the temperature of the second area of the machine body is 165-175 ℃, the temperature of the third area of the machine body is 170-185 ℃, the temperature of the fourth area of the machine body is 175-180 ℃, and the rotating speed of the screw is 18-22 rpm.
TABLE 1 component content (parts by weight) of Quantum dot diffusion plates of examples 1 to 16
Example 17
Example 17 provides a quantum dot diffusion plate, the component content is the same as that of example 1, and the preparation method is different from that of example 1 in that:
in the step S1, the mass ratio of the quantum dots to the partial resin base material is 3:100.
example 18
Example 18 provides a quantum dot diffusion plate, the component content is the same as that of example 1, and the preparation method is different from that of example 1 in that:
the organic solvent in step S1 is toluene.
Comparative examples 1 to 5
Comparative examples 1 to 5 each provided a quantum dot diffusion plate, the component contents are shown in table 2, and the preparation methods of comparative examples 1 to 4 are the same as examples 1 to 16;
the preparation method of comparative example 5 is as follows:
s1, dissolving quantum dots and part of resin base material in an organic solvent (styrene), uniformly mixing, and heating and stirring in a vacuum environment to remove the solvent to obtain a solid product, namely quantum dot master batch;
wherein the mass ratio of the quantum dots to the partial resin base material is 5:100;
s2, mixing the rest resin base material, the quantum dot master batch, the light diffusion agent, the weather resistant agent, the antioxidant and the lubricant which are prepared in the step S1, adding the mixture into a single screw extruder, and carrying out melt mixing and extrusion molding to obtain the quantum dot diffusion plate, wherein the size specification is 85 inches and the thickness is 1.5mm;
wherein the temperature of the head of the single screw extruder is 165-185 ℃, the temperature of the first area of the machine body is 150-160 ℃, the temperature of the second area of the machine body is 165-175 ℃, the temperature of the third area of the machine body is 170-185 ℃, the temperature of the fourth area of the machine body is 175-180 ℃, and the rotating speed of the screw is 18-22 rpm.
Table 2 component content (parts by weight) of Quantum dot diffusion plates of comparative examples 1 to 5
Comparative example 5
Comparative example 5 provides a quantum dot diffusion plate, the component content is the same as example 1, and the preparation method is as follows:
according to the component content of the embodiment 1, directly mixing all the components, adding the mixture into a single screw extruder, and carrying out melt mixing and extrusion molding to obtain a quantum dot diffusion plate, wherein the size specification is 85 inches and the thickness is 1.5mm;
wherein the temperature of the head of the single screw extruder is 165-185 ℃, the temperature of the first area of the machine body is 150-160 ℃, the temperature of the second area of the machine body is 165-175 ℃, the temperature of the third area of the machine body is 170-185 ℃, the temperature of the fourth area of the machine body is 175-180 ℃, and the rotating speed of the screw is 18-22 rpm.
Performance testing
The performance test is carried out on the quantum dot diffusion plates prepared in the embodiment and the comparative example, and the specific method is as follows:
brightness: placing the quantum dot diffusion plate under a blue light LED module, adopting an EVERFINE photometer to test the brightness of a central point, fixing 174mA current and fixing 8.3V voltage;
haze: testing according to GB/T2410-2008 standard method;
linear expansion coefficient: the test is carried out according to GB/T2572-2005 test method for average linear expansion coefficient of fiber reinforced plastics.
The test results of examples 1 to 18 are shown in Table 3, and the test results of comparative examples 1 to 6 are shown in Table 4.
TABLE 3 test results for examples 1-18
In general, the higher the brightness value of the quantum dot diffusion plate is, the better the light emitting and displaying effects are; the higher the haze value is, the better the shielding property is, namely, the electronic elements in the display can be shielded, and the display effect in the process of light emission is not affected; the lower the linear expansion coefficient, the better the deformation resistance. The quantum dot diffusion plate needs to be comprehensively evaluated for its light emission and display performance by combining the brightness and haze values.
In the application, the brightness is more than or equal to 3900cd, the haze is more than or equal to 90% as a qualified standard, the brightness is more than or equal to 4500cd, and the haze is more than or equal to 93.5% as a better standard.
According to the test results in table 1, the quantum dot diffusion plates prepared in each embodiment of the present invention satisfy the following conditions: the linear expansion coefficient is less than or equal to 50 mu m/(m DEG C), the brightness is more than or equal to 3900cd, the haze is more than or equal to 90%, and the product has excellent deformation resistance and high brightness and haze.
In examples 1 to 6, the linear expansion coefficients were close, and the quantum dot diffusion plates of examples 1 to 3 were relatively superior in combination of brightness and haze. Therefore, the refractive index of the glass fiber is preferably 1.5 to 1.57, and the average diameter is preferably 8 to 15. Mu.m.
According to examples 1, 8 and 9, good light emitting effect and deformation resistance can be achieved for different transparent resin substrates, wherein the brightness of the quantum dot diffusion plate is higher when the resin substrate is GPPS.
According to examples 1 and 10 to 12, the quantum dot diffusion plate obtained had both excellent brightness and haze when the amount of glass fiber added was 8 to 15 parts by weight. Although the quantum dot diffusion plate of example 12 has a relatively lower linear expansion coefficient, its luminance value is 300cd or more less than that of examples 1 and 11, and thus the quantum dot diffusion plates of examples 1 and 11 have better overall performance.
Table 4 test results of comparative examples 1 to 6
The refractive index of the glass fiber used in comparative example 1 was too low, and the brightness of the produced quantum dot diffusion plate was poor. The average diameter of the glass fiber in comparative example 2 is too small, and the glass fiber is distributed more densely in the quantum dot diffusion plate under the same quality, so that the haze of the quantum dot diffusion plate is qualified, but the brightness is poor.
The glass fiber content in comparative example 3 is too small to play an effective light diffusion role, the light refraction is insufficient, the brightness and the haze of the quantum dot diffusion plate are poor, and the obvious deformation resistance improvement effect cannot be played, so that the linear expansion coefficient of the quantum dot diffusion plate is high. In comparative example 4, the content of glass fiber was too large, and although the deformation resistance of the quantum dot diffusion plate was excellent, the brightness was 2560cd only, which is far lower than that of the example.
In comparative example 5, the quantum dot diffusion plate does not contain glass fiber, but uses a conventional light diffusion agent (nanosilica), and the linear expansion coefficient of the quantum dot diffusion plate is extremely high and the deformation resistance is poor.
In comparative example 6, the quantum dot master batch was not prepared, but all the components were directly mixed. The quantum dots have heating loss in the extrusion process, so that the quantum dot diffusion plate has poorer brightness.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The high-brightness shielding and low-deformation quantum dot diffusion plate is characterized by comprising the following components in parts by weight:
100 parts of resin base material, 5-18 parts of glass fiber, 0.1-1 part of quantum dot, 0.2-1 part of weather-proof agent, 0.3-2 parts of antioxidant and 1-2 parts of lubricant;
the refractive index of the glass fiber is 1.4-1.58, and the average diameter is 7-17 mu m.
2. The quantum dot diffusion plate of claim 1, wherein the glass fiber has a refractive index of 1.50 to 1.57.
3. The quantum dot diffusion plate of claim 1, wherein the glass fiber has an average diameter of 8 to 15 μm.
4. The quantum dot diffusion plate according to claim 1, wherein the glass fiber is contained in an amount of 8 to 15 parts by weight.
5. The quantum dot diffusion plate according to claim 1, wherein the resin base material is one or more of polystyrene, polymethyl methacrylate, styrene-polymethyl methacrylate copolymer or polycarbonate.
6. The method for preparing the quantum dot diffusion plate according to any one of claims 1 to 5, comprising the steps of:
s1, dissolving quantum dots and part of resin base material in an organic solvent, uniformly mixing, heating and stirring in a vacuum environment, and removing the solvent to obtain a solid product, namely quantum dot master batch;
s2, mixing the rest resin base material, the quantum dot master batch prepared in the step S1, glass fiber, a weather-proof agent, an antioxidant and a lubricant, adding the mixture into an extruder, and carrying out melt mixing and extrusion molding to obtain the quantum dot diffusion plate.
7. The method according to claim 6, wherein in the step S1, the mass ratio of the quantum dots to the partial resin base material is (3 to 5): 100.
8. the method according to claim 6, wherein in step S2, the extruder is a single screw extruder; the temperature of the machine head of the single screw extruder is 165-185 ℃, the temperature of the first area of the machine body is 150-160 ℃, the temperature of the second area of the machine body is 165-175 ℃, the temperature of the third area of the machine body is 170-185 ℃, the temperature of the fourth area of the machine body is 175-180 ℃, and the rotating speed of the screw is 18-22 rpm.
9. Use of the quantum dot diffusion plate according to any one of claims 1 to 5 for the preparation of large-sized display devices.
10. The use of claim 9, wherein the large display device has a dimensional specification of greater than or equal to 65 inches.
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| JP2013079179A (en) * | 2011-10-05 | 2013-05-02 | Konica Minolta Advanced Layers Inc | Wavelength converting member and solar battery module using the same |
| CN110534544A (en) * | 2018-05-24 | 2019-12-03 | 上海和辉光电有限公司 | It is a kind of can anti-picture distortion flexible display panels and display device |
| JP2021172689A (en) * | 2020-04-20 | 2021-11-01 | 石塚硝子株式会社 | Film |
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| JP2013079179A (en) * | 2011-10-05 | 2013-05-02 | Konica Minolta Advanced Layers Inc | Wavelength converting member and solar battery module using the same |
| CN110534544A (en) * | 2018-05-24 | 2019-12-03 | 上海和辉光电有限公司 | It is a kind of can anti-picture distortion flexible display panels and display device |
| JP2021172689A (en) * | 2020-04-20 | 2021-11-01 | 石塚硝子株式会社 | Film |
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