CN216670312U - High stability quantum dot diffuser plate - Google Patents
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- CN216670312U CN216670312U CN202123305334.4U CN202123305334U CN216670312U CN 216670312 U CN216670312 U CN 216670312U CN 202123305334 U CN202123305334 U CN 202123305334U CN 216670312 U CN216670312 U CN 216670312U
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Abstract
The utility model belongs to the field of optical display, and particularly relates to a high-stability quantum dot diffusion plate. The utility model provides a quantum dot diffusion plate, aiming at solving the problem of poor optical performance stability of the existing quantum dot diffusion plate. The quantum dot diffusion plate sequentially comprises a first upper blocking layer, a second upper blocking layer, a quantum dot layer, a second lower blocking layer and a first lower blocking layer. The quantum dot diffusion plate is formed in one step through five-layer co-extrusion. The quantum dot layer is formed by a modified polystyrene resin system, the first barrier layer is formed by a modified polyethylene resin system, and the second barrier layer is formed by a modified polyvinyl alcohol resin system. The quantum dot diffusion plate provided by the utility model combines the characteristics of oxygen resistance of polyvinyl alcohol and water resistance of polyethylene, and greatly improves the water and oxygen resistance of the whole structure, so that the quantum dot diffusion plate has good optical stability.
Description
Technical Field
The utility model belongs to the field of optical display, and particularly relates to a high-stability quantum dot diffusion plate.
Background
Quantum Dots (QDs) are nanoparticles having a size smaller than or close to the exciton bohr radius of a bulk material and exhibiting a Quantum effect, and have a Quantum size effect, a macroscopic Quantum tunneling effect, a dielectric confinement effect and a surface effect due to the specific structure of the Quantum Dots, thereby generating unique physical and chemical properties and unique light emitting properties. The quantum dot luminescence has excellent photoelectric characteristics of high quantum yield, long fluorescence lifetime, good light stability, wide absorption spectrum, narrow fluorescence spectrum half-peak width, good symmetry, easy control of fluorescence peak position and the like, and the quantum dot is widely applied to the fields of materials science, display equipment and the like instead of the traditional fluorescent powder. However, the existing method has the problem of poor water and oxygen resistance in the use process of the quantum dots, namely, the quantum dots are contacted with air in the use process and are easily oxidized by oxygen and water vapor in the air to cause the reduction of fluorescence intensity. In order to solve the above problems, a compact inorganic layer (made of silicon nitride, silicon oxide, or aluminum oxide) is generally introduced to the surface of a substrate by magnetron sputtering or evaporation, so as to isolate the transmission of water and oxygen and maintain the stability of the optical performance of the quantum dot film in use. However, the above scheme causes a large increase in cost, and limits the large-scale use of quantum dot films.
As another use form of the quantum dot in the backlight module, the quantum dot diffusion plate generally does not use the above-mentioned water-oxygen barrier film in the structure, but some adjustments are made to the quantum dot structure, such as thickening the quantum dot shell layer, wrapping with inorganic matter, etc., so that the quantum dot diffusion plate can also meet the use requirements. Since it does not use an expensive barrier film and its cost is much lower than that of a quantum dot film, it has recently been widely used in the field of backlight display. However, the protection of the quantum dots is still weaker than that of the barrier film in the whole treatment modes, so that the optical performance stability of the current quantum dot diffusion plate in long-term use is obviously weaker than that of the quantum dot film.
Polyethylene is an excellent nonpolar material and has a very high water-blocking rate, but has a high gas permeability to oxygen, carbon dioxide, and the like. Polyvinyl alcohol has the characteristics of low gas permeability such as oxygen, carbon dioxide and the like and low water resistance. Through structural design, two materials are compounded to serve as the blocking layer of the quantum dot diffusion plate, high water blocking rate and high oxygen blocking rate can be achieved simultaneously, and therefore the optical performance stability of the quantum dot diffusion plate is improved. However, because the molecular structure of polyethylene is nonpolar and the molecular structure of polyvinyl alcohol is polar, the compatibility of the two is very poor, and the adhesion between layers cannot be directly formed.
Disclosure of Invention
The utility model provides a quantum dot diffusion plate, aiming at solving the problem of poor optical performance stability of the existing quantum dot diffusion plate. The quantum dot diffusion plate has low cost and solves the problem of poor optical performance stability of the existing quantum dot diffusion plate. The quantum dot diffusion plate provided by the utility model has the advantages of cheap and easily-obtained raw materials, simple process and low cost, and can be used for quickly realizing industrial production and large-scale application.
In order to solve the technical problems, the utility model provides the following technical scheme:
the utility model provides a quantum dot diffusion plate which comprises a first upper blocking layer, a second upper blocking layer, a quantum dot layer, a second lower blocking layer and a first lower blocking layer.
The utility model provides a quantum dot diffusion plate which sequentially comprises a first upper blocking layer, a second upper blocking layer, a quantum dot layer, a second lower blocking layer and a first lower blocking layer.
In the quantum dot diffusion plate, no bonding layer is arranged between every two layers.
The quantum dot diffusion plate is composed of a first upper blocking layer, a second upper blocking layer, a quantum dot layer, a second lower blocking layer and a first lower blocking layer in sequence.
The quantum dot diffusion plate is formed in one step through five-layer co-extrusion.
The quantum dot diffusion plate is of a sandwich symmetrical structure.
The first upper barrier layer and the first lower barrier layer are the same and are both referred to as the first barrier layer for short.
The second upper barrier layer and the second lower barrier layer are the same and are both referred to as the second barrier layer.
Furthermore, the first barrier layer is made of polyvinyl resin, and the second barrier layer is made of polyvinyl alcohol resin.
The quantum dot diffusion plate provided by the utility model combines the oxygen resistance of polyvinyl alcohol and the water resistance of polyethylene, and the water and oxygen resistance of the whole structure is greatly improved, so that the quantum dot diffusion plate has good optical stability.
Furthermore, the quantum dot layer of the quantum dot diffusion plate is formed by a modified polystyrene resin system, wherein the modified polystyrene resin system comprises polystyrene, metallocene polyethylene, peroxide, styrene monomer and quantum dot powder. And blending the raw materials of the quantum dot layer, and then performing reactive extrusion to obtain the quantum dot layer. The foregoing blending process may be a direct blending of solids with liquids.
Furthermore, the quantum dot powder comprises red quantum dot powder, or green quantum dot powder, or a combination of the red quantum dot powder and the green quantum dot powder.
Further, the formula of the modified polystyrene resin system (i.e. quantum dot layer) is as follows: 70-90 parts of polystyrene, 10-30 parts of metallocene polyethylene, 1-3 parts of peroxide, 2-5 parts of styrene monomer and 2-4 parts of quantum dot powder; the quantum dot powder comprises 0-2 parts of red quantum dot powder and 0-2 parts of green quantum dot powder; the total parts of the polystyrene and the metallocene polyethylene are 100 parts; the parts are parts by weight. The foregoing technical solutions include examples 1 to 7. In the extrusion process, peroxide is decomposed to generate free radicals, and the styrene monomer is initiated to react with polystyrene and metallocene polyethylene to form a block polymer, so that the compatibility of the polystyrene and the metallocene polyethylene is improved, and the adhesion with the second barrier layer is improved. Metallocene polyethylene is added into the Quantum Dot (QD) layer, vinyl alcohol-ethylene copolymer is added into the second barrier layer, a polyethylene chain segment is introduced, and the adhesion force between the quantum dot layer and the second barrier layer is improved through the polyethylene chain segment.
Further, the peroxide is one of dicumyl oxide, di (tert-butylperoxyisopropyl) benzene, 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane or 1, 1-bis (tert-butylperoxy) -3,3, 5-trimethylcyclohexane.
Furthermore, the thickness of the quantum dot layer is 0.5-1.5 mm.
Furthermore, the first barrier layer of the quantum dot diffusion plate is composed of a modified polyethylene resin system, and the modified polyethylene resin system is obtained by blending metallocene polyethylene and ethylene-vinyl acetate copolymer and then extruding the blend.
Further, the formula of the modified polyethylene resin system (namely the first barrier layer) is as follows: 80-95 parts of metallocene polyethylene and 5-20 parts of ethylene-vinyl acetate copolymer; the total parts of the metallocene polyethylene and the ethylene-vinyl acetate copolymer are 100 parts; the parts are parts by weight. The ethylene-vinyl acetate copolymer is added in the formula to improve the compatibility of the first barrier layer and the second barrier layer and improve the bonding force between the layers, thereby achieving the effect of no need of using a bonding agent. The ethylene-vinyl acetate copolymer in the first barrier layer and the vinyl alcohol-ethylene copolymer in the second barrier layer act together to improve the adhesive force. The ethylene-vinyl acetate copolymer in the first barrier layer improves the polarity of a system and increases the compatibility with polyvinyl alcohol, and meanwhile, the vinyl alcohol-ethylene copolymer in the second barrier film layer improves the compatibility with polyethylene through a polyethylene chain segment of the copolymer, so that the adhesive force between the second barrier layer and the first barrier layer is improved.
Further, the thickness of the first barrier layer is 0.1-0.2 mm.
Furthermore, the second barrier layer of the quantum dot diffusion plate is composed of a modified polyvinyl alcohol resin system.
The modified polyvinyl alcohol resin system of the second barrier layer is obtained by blending polyvinyl alcohol, a vinyl alcohol-ethylene copolymer and caprolactam and then extruding.
Further, the formula of the modified polyvinyl alcohol resin system (namely, the second barrier layer) is as follows: 10-20 parts of vinyl alcohol-ethylene copolymer, 80-90 parts of polyvinyl alcohol and 2-5 parts of caprolactam; the total parts of the vinyl alcohol-ethylene copolymer and the polyvinyl alcohol are 100 parts; the parts are parts by weight. In the formula, polyvinyl alcohol plays a role in improving oxygen barrier rate, a vinyl alcohol-ethylene copolymer plays a role in improving adhesion with the first barrier layer, and caprolactam is used as a formula plasticizer.
Further, the thickness of the second barrier layer is 0.1-0.2 mm.
Further, the polyvinyl alcohol has an average polymerization degree of 2400 to 2500.
Further, the melt index of the metallocene polyethylene is 0.3g/10 min.
Further, the polystyrene has a melt index of 8.0g/10 min.
Further, the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28%.
Further, the mass content of the ethylene block in the vinyl alcohol-ethylene copolymer is 24%.
According to the quantum dot diffusion plate, during the extrusion process of the quantum dot layer, peroxide is decomposed to generate free radicals, and the styrene monomer, the polystyrene and the metallocene polyethylene are initiated to react to form a block polymer, so that the compatibility of the polystyrene and the metallocene polyethylene is improved, and the effect of improving the adhesion with the second barrier layer is achieved. The first barrier layer and the second barrier layer play a role in improving the adhesion force with adjacent layers by adding the vinyl alcohol-ethylene copolymer, so that the integral quantum dot diffusion plate combines the oxygen resistance of polyvinyl alcohol and the water resistance of polyethylene, the water and oxygen resistance of the integral structure is greatly improved, and the quantum dot diffusion plate has good optical stability.
Further, the formula of the modified polystyrene resin system (i.e. quantum dot layer) is as follows: 80 parts of polystyrene, 20 parts of metallocene polyethylene, 2 parts of peroxide, 4 parts of styrene monomer and 4 parts of quantum dot powder; the quantum dot powder comprises 2 parts of red quantum dot powder and 2 parts of green quantum dot powder; the parts are parts by weight. The thickness of the quantum dot layer is 1-1.5 mm. The formula of the modified polyethylene resin system (namely the first barrier layer) is as follows: 80-95 parts of metallocene polyethylene and 5-20 parts of ethylene-vinyl acetate copolymer; the total parts of the metallocene polyethylene and the ethylene-vinyl acetate copolymer are 100 parts; the parts are parts by weight. The thickness of the first barrier layer is 0.1-0.2 mm. The formula of the modified polyvinyl alcohol resin system (namely the second barrier layer) is as follows: 10-20 parts of vinyl alcohol-ethylene copolymer, 80-90 parts of polyvinyl alcohol and 2-5 parts of caprolactam; the total parts of the vinyl alcohol-ethylene copolymer and the polyvinyl alcohol are 100 parts; the parts are parts by weight. The thickness of the second barrier layer is 0.1-0.2 mm. The foregoing technical solutions include examples 1 to 5.
Further, the formula of the modified polystyrene resin system (i.e. quantum dot layer) is as follows: 80 parts of polystyrene, 20 parts of metallocene polyethylene, 2 parts of peroxide, 4 parts of styrene monomer and 4 parts of quantum dot powder; the quantum dot powder comprises 2 parts of red quantum dot powder and 2 parts of green quantum dot powder; the parts are parts by weight. The thickness of the quantum dot layer is 1 mm. The formula of the modified polyethylene resin system (namely the first barrier layer) is as follows: 90 parts of metallocene polyethylene and 10 parts of ethylene-vinyl acetate copolymer; the parts are parts by weight. Further, the thickness of the first barrier layer is 0.2 mm. The formula of the modified polyvinyl alcohol resin system (namely the second barrier layer) is as follows: 15 parts of vinyl alcohol-ethylene copolymer, 85 parts of polyvinyl alcohol and 4 parts of caprolactam; the parts are parts by weight. The thickness of the second barrier layer is 0.2 mm. The foregoing technical solution includes example 1.
The utility model provides a preparation method of a quantum dot diffusion plate.
Furthermore, in the preparation process of the quantum dot diffusion plate, the raw materials of all layers of the diffusion plate are mixed by a double-screw extruder and then enter a multilayer co-extrusion die head for extrusion, so that the quantum dot diffusion plate is obtained.
The utility model has the following beneficial effects:
the design scheme of the utility model is based on the existing mass production process of the quantum dot diffusion plate for upgrading, and the fast and large-scale mass production can be realized on the basis of the existing process route; the polymer system and the designed structure used in the utility model have strong water and oxygen resistance and still have excellent optical stability under severe aging conditions (high temperature, high humidity and strong blue light). The polymer formula designed and used in the utility model is beneficial to a reactive extrusion mode, improves the compatibility among layers, enables the layers not to use extra binder, and has the advantages of simple process, low cost and the like.
The quantum dot diffusion plate prepared by the utility model is an optical plate with high brightness (brightness) and high stability, and has wide and excellent application prospect in the field of display equipment. The quantum dot diffusion plate provided by the utility model has excellent optical stability, has stronger compatibility with the appearance design of display equipment, has the advantages of cheap and easily-obtained raw materials, simple process and lower cost, and can be used for realizing efficient industrial production.
Drawings
Fig. 1 is a schematic structural diagram of a high-stability quantum dot diffusion plate provided by the utility model.
Reference numbers in the figures:
10 a first upper barrier layer (first barrier layer for short),
20 a second upper barrier layer (second barrier layer for short),
a layer of 30 quantum dots is formed,
40 a second lower barrier layer (referred to as a second barrier layer),
50 a first lower barrier layer (first barrier layer for short),
Detailed Description
The technical solution of the present invention will be further described with reference to the following embodiments and accompanying drawings.
As shown in fig. 1, the present invention provides a quantum dot diffusion plate, which has a sandwich symmetric structure and five layers, wherein the first layer to the fifth layer are a first upper barrier layer 10, a second upper barrier layer 20, a quantum dot layer 30, a second lower barrier layer 40, and a first lower barrier layer 50, respectively.
Example 1
As shown in fig. 1, the present invention provides a quantum dot diffusion plate, which has a sandwich symmetric structure, and has a five-layer structure, wherein the first layer to the fifth layer are respectively a first barrier layer 10, a second barrier layer 20, a quantum dot layer 30, a second barrier layer 40, and a first barrier layer 50.
The polymer used had the following characteristics: the melt index of the polystyrene is 8.0g/10 min; the melt index of the metallocene polyethylene is 0.3g/10 min; the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28 percent; the average polymerization degree of the polyvinyl alcohol is 2400-2500; the mass content of the ethylene block in the vinyl alcohol-ethylene copolymer was 24%.
The modified polyethylene resin system of the first barrier layer comprises the following components in percentage by weight: 90 parts of metallocene polyethylene and 10 parts of ethylene-vinyl acetate copolymer, and a double-screw extruder is used, wherein the set temperature of each section of the extruder is 160 ℃.
The modified polyvinyl alcohol resin system of the second barrier layer comprises the following components in percentage by weight: 15 parts of vinyl alcohol-ethylene copolymer, 85 parts of polyvinyl alcohol and 4 parts of caprolactam. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The modified polystyrene resin system of the quantum dot layer comprises the following components in percentage by weight: 80 parts of polystyrene, 20 parts of metallocene polyethylene, 2 parts of dicumyl oxide, 4 parts of styrene monomer, 2 parts of red quantum dot powder and 2 parts of green quantum dot powder. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder. The formulation of this layer is solid-liquid blended and undergoes chemical reaction during extrusion.
The raw materials of each layer are mixed by a double-screw extruder and then enter a multi-layer co-extrusion die head to obtain the final quantum dot diffusion plate, wherein the thickness of each layer is 1mm of the quantum dot layer, 0.2mm of the first barrier layer, 0.2mm of the second barrier layer and 1.8mm of the total thickness.
Example 2
The quantum dot diffuser plate as described in example 1, using the following polymer characteristics: the melt index of the polystyrene is 8.0g/10 min; the melt index of the metallocene polyethylene is 0.3g/10 min; the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28 percent; the average polymerization degree of the polyvinyl alcohol is 2400-2500; the mass content of the ethylene block in the vinyl alcohol-ethylene copolymer was 24%.
The first barrier layer is prepared from the following modified polyethylene resin systems in parts by weight: 80 parts of metallocene polyethylene and 20 parts of ethylene-vinyl acetate copolymer, and a double-screw extruder is used, wherein the set temperature of each section of the extruder is 160 ℃.
The modified polyvinyl alcohol resin system selected for the second barrier layer comprises the following components in percentage by weight: 15 parts of vinyl alcohol-ethylene copolymer, 85 parts of polyvinyl alcohol and 4 parts of caprolactam. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The quantum dot layer adopts a modified polystyrene resin system with the weight ratio as follows: 80 parts of polystyrene, 20 parts of metallocene polyethylene, 2 parts of 1, 1-bis (tert-butylperoxy) -3,3, 5-trimethylcyclohexane, 4 parts of styrene monomer, 2 parts of red quantum dot powder and 2 parts of green quantum dot powder. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The raw materials of each layer are mixed by a double-screw extruder and then enter a multi-layer co-extrusion die head to obtain the final quantum dot diffusion plate, wherein the thickness of each layer is 1mm of the quantum dot layer, 0.1mm of the first barrier layer, 0.2mm of the second barrier layer and 1.6mm of the total thickness.
Example 3
The quantum dot diffuser plate as described in example 1, using the following polymer properties: the melt index of the polystyrene is 8.0g/10 min; the melt index of the metallocene polyethylene is 0.3g/10 min; the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28 percent; the average polymerization degree of the polyvinyl alcohol is 2400-2500; the mass content of the ethylene block in the vinyl alcohol-ethylene copolymer was 24%.
The first barrier layer is prepared from the following modified polyethylene resin system in percentage by weight: 95 parts of metallocene polyethylene and 5 parts of ethylene-vinyl acetate copolymer, and a double-screw extruder is used, wherein the set temperature of each section of the extruder is 160 ℃.
The modified polyvinyl alcohol resin system selected for the second barrier layer comprises the following components in percentage by weight: 15 parts of vinyl alcohol-ethylene copolymer, 85 parts of polyvinyl alcohol and 4 parts of caprolactam. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The quantum dot layer adopts a modified polystyrene resin system with the weight ratio as follows: 80 parts of polystyrene, 20 parts of metallocene polyethylene, 2 parts of dicumyl oxide, 4 parts of styrene monomer, 2 parts of red quantum dot powder and 2 parts of green quantum dot powder. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
Above each layer raw materials get into multilayer coextrusion die head after twin-screw extruder mixes, obtain final quantum dot diffuser plate, and each layer thickness is quantum dot layer 1mm, first barrier layer 0.2mm, second barrier layer 0.2mm, total thickness 1.8 mm.
Example 4
The quantum dot diffuser plate as described in example 1, using the following polymer properties: the melt index of the polystyrene is 8.0g/10 min; the melt index of the metallocene polyethylene is 0.3g/10 min; the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28 percent; the average polymerization degree of the polyvinyl alcohol is 2400-2500; the mass content of the ethylene block in the vinyl alcohol-ethylene copolymer was 24%.
The first barrier layer is prepared from the following modified polyethylene resin systems in parts by weight: 90 parts of metallocene polyethylene and 10 parts of ethylene-vinyl acetate copolymer, and a double-screw extruder is used, wherein the set temperature of each section of the extruder is 160 ℃.
The modified polyvinyl alcohol resin system selected for the second barrier layer comprises the following components in percentage by weight: 10 parts of vinyl alcohol-ethylene copolymer, 90 parts of polyvinyl alcohol and 5 parts of caprolactam. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The quantum dot layer adopts a modified polystyrene resin system with the weight ratio as follows: 80 parts of polystyrene, 20 parts of metallocene polyethylene, 2 parts of di (tert-butyl isopropyl peroxide) benzene, 4 parts of styrene monomer, 2 parts of red quantum dot powder and 2 parts of green quantum dot powder. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The raw materials of each layer are mixed by a double-screw extruder and then enter a multi-layer co-extrusion die head to obtain the final quantum dot diffusion plate, wherein the thickness of each layer is 1mm of the quantum dot layer, 0.2mm of the first barrier layer, 0.1mm of the second barrier layer and 1.6mm of the total thickness.
Example 5
The quantum dot diffuser plate as described in example 1, using the following polymer properties: the melt index of the polystyrene is 8.0g/10 min; the melt index of the metallocene polyethylene is 0.3g/10 min; the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28 percent; the average polymerization degree of the polyvinyl alcohol is 2400-2500; the mass content of the ethylene block in the vinyl alcohol-ethylene copolymer was 24%.
The first barrier layer is prepared from the following modified polyethylene resin system in percentage by weight: 90 parts of metallocene polyethylene and 10 parts of ethylene-vinyl acetate copolymer, and a double-screw extruder is used, wherein the set temperature of each section of the extruder is 160 ℃.
The modified polyvinyl alcohol resin system selected for the second barrier layer comprises the following components in percentage by weight: 20 parts of vinyl alcohol-ethylene copolymer, 80 parts of polyvinyl alcohol and 5 parts of caprolactam. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The quantum dot layer adopts a modified polystyrene resin system with the weight ratio as follows: 80 parts of polystyrene, 20 parts of metallocene polyethylene, 2 parts of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, 4 parts of styrene monomer, 2 parts of red quantum dot powder and 2 parts of green quantum dot powder. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The raw materials of each layer are mixed by a double-screw extruder and then enter a multi-layer co-extrusion die head to obtain the final quantum dot diffusion plate, wherein the thickness of each layer is 1.5mm of the quantum dot layer, 0.2mm of the first barrier layer, 0.1mm of the second barrier layer and 2.1mm of the total thickness.
Example 6
The quantum dot diffuser plate as described in example 1, using the following polymer properties: the melt index of the polystyrene is 8.0g/10 min; the melt index of the metallocene polyethylene is 0.3g/10 min; the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28 percent; the average polymerization degree of the polyvinyl alcohol is 2400-2500; the mass content of the ethylene block in the vinyl alcohol-ethylene copolymer was 24%.
The first barrier layer is prepared from the following modified polyethylene resin system in percentage by weight: 90 parts of metallocene polyethylene and 10 parts of ethylene-vinyl acetate copolymer, and a double-screw extruder is used, wherein the set temperature of each section of the extruder is 160 ℃.
The modified polyvinyl alcohol resin system selected for the second barrier layer comprises the following components in percentage by weight: 15 parts of vinyl alcohol-ethylene copolymer, 85 parts of polyvinyl alcohol and 4 parts of caprolactam. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The quantum dot layer adopts a modified polystyrene resin system with the following formula weight ratio: 70 parts of polystyrene, 30 parts of metallocene polyethylene, 3 parts of dicumyl oxide, 5 parts of styrene monomer, 0.1 part of red quantum dot powder and 2 parts of green quantum dot powder. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The raw materials of each layer are mixed by a double-screw extruder and then enter a multi-layer co-extrusion die head to obtain the final quantum dot diffusion plate, wherein the thickness of each layer is 0.5mm of a quantum dot layer, 0.2mm of a first barrier layer, 0.2mm of a second barrier layer and 1.3mm of the total thickness.
Example 7
The quantum dot diffuser plate as described in example 1, using the following polymer properties: the melt index of the polystyrene is 8.0g/10 min; the melt index of the metallocene polyethylene is 0.3g/10 min; the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 28 percent; the average polymerization degree of the polyvinyl alcohol is 2400-2500; the mass content of the ethylene block in the vinyl alcohol-ethylene copolymer was 24%.
The first barrier layer is prepared from the following modified polyethylene resin system in percentage by weight: 90 parts of metallocene polyethylene and 10 parts of ethylene-vinyl acetate copolymer, and a double-screw extruder is used, wherein the set temperature of each section of the extruder is 160 ℃.
The modified polyvinyl alcohol resin system selected for the second barrier layer comprises the following components in percentage by weight: 15 parts of vinyl alcohol-ethylene copolymer, 85 parts of polyvinyl alcohol and 4 parts of caprolactam. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The quantum dot layer adopts a modified polystyrene resin system with the weight ratio as follows: 90 parts of polystyrene, 10 parts of metallocene polyethylene, 1 part of dicumyl oxide, 2 parts of styrene monomer, 2 parts of red quantum dot powder and 0.1 part of green quantum dot powder. A twin-screw extruder was used, and the temperature was set at 160 ℃ for each section of the extruder.
The raw materials of each layer are mixed by a double-screw extruder and then enter a multi-layer co-extrusion die head to obtain the final quantum dot diffusion plate, wherein the thickness of each layer is 0.5mm of a quantum dot layer, 0.2mm of a first barrier layer, 0.2mm of a second barrier layer and 1.3mm of the total thickness.
Comparative example
The comparative example is a quantum dot diffuser plate manufactured by Nantong Chunyidan New materials GmbH, product model CPQ18B, with a sample thickness of 1.8 mm.
The test method of the quantum dot diffusion plate is as follows.
The quantum dot diffuser plate was cut to a size of a4, and tested for brightness and white point with a blue backlight module on a CS-2000 model luminance tester (i.e., color coordinates, data are Wx and Wy values). Then, the samples were divided into 3 groups, and 5 samples in each group were placed in a high-temperature oven, a high-temperature and high-humidity oven, and a blue light box, respectivelyAfter 1000 hours, the luminance and white point tests were again carried out and compared. Where the color coordinates are averaged for the luminance of the data for each patch. Further, the temperature of the high-temperature oven is set to 80 ℃; the high-temperature high-humidity box is set to be 65 ℃ and the humidity is 95 percent; the blue light box is set to 350mW/cm2Strong blue light irradiation. The test results are compared as follows:
table 1 test results of high temperature aging optical properties of quantum dot diffusion plates provided in examples and comparative examples
Table 2 test results of high temperature, high humidity, and aging optical properties of quantum dot diffusion plates provided in examples and comparative examples
Table 3 test results of strong blue light aging optical properties of quantum dot diffusion plates provided in examples and comparative examples
As can be seen from the test results in tables 1 to 3, the quantum dot diffusion plates provided in examples 1 to 7 have excellent stability and optical properties when tested under high temperature, high temperature and high humidity, and strong blue light irradiation. Under the test conditions of the limit, no matter high temperature, high temperature and high humidity or strong blue light irradiation, the brightness fluctuation range of the samples of the above embodiments is less than 10%, and the fluctuation range of the color coordinates is less than 0.01, so that the samples are superior to the current commercial mass production sample (CPQ18B), especially the high temperature aging performance and the strong blue light aging performance. The test results show that the quantum dot diffusion plate has excellent stability and optical performance. In particular, the quantum dot diffusion plate provided in example 1 has better overall performance, and has good stability in high temperature, high humidity and strong blue light irradiation detection, and the fluctuation range of the brightness is less than 5%, and the fluctuation range of the color coordinates is less than 0.005.
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 utility model, 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 (10)
1. The quantum dot diffusion plate is characterized by comprising a first upper blocking layer, a second upper blocking layer, a quantum dot layer, a second lower blocking layer and a first lower blocking layer in sequence.
2. The quantum dot diffuser plate according to claim 1, wherein no adhesive layer is provided between the layers.
3. The quantum dot diffusion plate according to claim 1, wherein the quantum dot diffusion plate is sequentially composed of a first upper barrier layer, a second upper barrier layer, a quantum dot layer, a second lower barrier layer, and a first lower barrier layer.
4. The quantum dot diffuser plate according to claim 1, wherein the quantum dot diffuser plate is formed in one step by five-layer co-extrusion.
5. The quantum dot diffuser plate of claim 1, wherein the quantum dot diffuser plate is a sandwich symmetric structure.
6. The quantum dot diffuser plate according to claim 1, wherein the first upper barrier layer and the first lower barrier layer are the same and are both referred to as first barrier layers, and the thickness of the first barrier layers is 0.1-0.2 mm.
7. The quantum dot diffuser plate according to claim 6, wherein the second upper barrier layer and the second lower barrier layer are the same and are both referred to as second barrier layers, and the thickness of the second barrier layers is 0.1-0.2 mm.
8. The quantum dot diffuser plate according to claim 7, wherein the thickness of the quantum dot layer is 0.5-1.5 mm.
9. The quantum dot diffuser plate according to claim 1, wherein the first upper barrier layer and the first lower barrier layer are the same and are both referred to as first barrier layers, and the first barrier layers are made of polyethylene resin.
10. The quantum dot diffusion plate according to claim 6, wherein the second upper barrier layer and the second lower barrier layer are the same and are both referred to as the second barrier layer, and the second barrier layer is made of polyvinyl alcohol resin.
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| CN115710468A (en) * | 2022-10-28 | 2023-02-24 | 四川东方绝缘材料股份有限公司 | Anti-aging quantum dot diffusion plate and preparation method thereof |
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