Inert gas foamed quantum dot diffusion plate and preparation process
By using inert gas foaming technology during the extrusion process of the diffusion plate, a three-layer structure quantum dot diffusion plate is formed, which solves the problem of insufficient compatibility of the single-layer extrusion method, and achieves higher compatibility and material use efficiency , improves brightness and stability.
Patent Information
- Application Number
- CN202411618347.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2024-12-27
AI Technical Summary
Most of the existing diffusion plate extrusion methods are single-layer extrusion, which cannot be compatible with more models and types, resulting in insufficient compatibility and low material use efficiency.
The quantum dot diffusion plate foamed by inert gas is formed by adding foaming agent during the extrusion of particles of the upper and lower diffusion plates to form a three-layer structure, including the first substrate layer, the second main layer and the third substrate layer. The intermediate layer is an extrusion layer of quantum dot particles, and is foamed during the extrusion process to reduce density and improve brightness.
The multi-match compatibility of diffusion plates is achieved, which reduces the use of raw materials and costs, improves brightness and picture stability, and reduces assembly steps and employee fatigue.
Smart Images
Figure CN119200060A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of diffusion plates, and in particular to an inert gas foamed quantum dot diffusion plate and a preparation process thereof. Background Art
[0002] The diffuser plate (QDDP) can replace the functions of the diffuser plate and quantum dot film in the backlight module. While converting the point light source into a surface light source, the quantum dots in the quantum dot functional plate will generate red light (R) and green light (G) under the stimulation of the blue light LED backlight, and mix with part of the blue light (B) that passes through the plate to obtain white light, thereby enhancing the luminous effect of the entire LCD backlight, improving the LCD color gamut, and making the display range more vivid.
[0003] Most of the existing diffusion plate extrusion methods are single-layer extrusion, which is not compatible with more models and types. By adding a foaming step in the extrusion process of the upper and lower surfaces of the diffusion plate during the manufacturing process of the QDDP diffusion plate, the density of the diffusion plate can be reduced, the image stability can be improved, and the use of raw materials can be saved.
[0004] The diffusion plate extruded by the method adopted by the present invention can actually be matched multiple times and has stronger compatibility. The process of foaming the quantum dot diffusion plate is also a secondary processing of the plate, which makes the reliability of the plate more stable. The unique internal foaming structure will improve the brightness, save the particle cost of the diffusion plate, and reduce the use of raw materials. Summary of the invention
[0005] The purpose of the present invention is to provide an inert gas foamed quantum dot diffusion plate and a preparation process, which solves the technical problem that most of the existing diffusion plate extrusion methods are single-layer extrusion and cannot be compatible with more models and types.
[0006] To achieve the above-mentioned object, in a first aspect, the present invention provides an inert gas foamed quantum dot diffusion plate, comprising a first substrate layer, a second main layer and a third substrate layer are sequentially arranged from top to bottom below the first substrate layer, the first substrate layer and the third substrate layer are both extrusion layers of diffusion plate particles, and the second main layer is an extrusion layer of quantum dot particles; The first substrate layer and the third substrate layer are foamed by adding a foaming agent while the diffusion plate particles are extruded.
[0007] Wherein, the density of the inert gas foamed quantum dot diffusion plate is 10-40kg / m³.
[0008] In a second aspect, the present invention further provides a process for preparing an inert gas foamed quantum dot diffusion plate, comprising the following steps: The diffusion plate particles, quantum dot particles and foaming agent are placed in different containers respectively, and then the diffusion plate particles and the quantum dot particles are melted at high temperature respectively; After melting, the diffusion plate particles and the quantum dot particles are extruded according to a structure in which the upper and lower layers are both the diffusion plate particles and the middle layer is the quantum dot particles; While the diffusion plate particles of the upper and lower layers are being extruded, a foaming agent is added to the diffusion plate particles of the upper and lower layers, and the foaming agent is foamed inside the diffusion plate particles by high temperature.
[0009] Wherein, the extrusion process of the diffusion plate particles and the quantum dot particles is: The diffusion plate particles and the quantum dot particles of the upper, middle and lower layers are melted at high temperatures respectively through the twin-screw structure of the extruder; After melting, the particles are extruded in a structure in which the upper and lower layers are both the diffusion plate particles and the middle layer is the quantum dot particles.
[0010] Wherein, the extrusion temperature of the diffusion plate particles and the quantum dot particles is: 90-230°C.
[0011] Wherein, the foaming agent is polystyrene, and the polystyrene divides the interior of the diffusion plate particles into tens of thousands of small gas chambers through a plurality of small holes.
[0012] Wherein, soluble gas is added to the foaming agent and diffused to a higher temperature region through the heating of the screw, thereby forming a good foaming effect.
[0013] The present invention discloses an inert gas foamed quantum dot diffusion plate and a preparation process. On the basis of the original single-layer extrusion, the present invention replaces the die head and changes it to three-layer extrusion. The upper and lower layers are extruded for diffusion plate particles, and the middle layer is extruded for quantum dot particles. The upper and lower layers are foamed at the same time as they are extruded, so that the raw materials on the upper and lower surfaces of the quantum dot diffusion plate are in a bubble state, thereby improving the brightness of the diffusion plate, reducing the density of the diffusion plate, saving the use of raw materials, and reducing costs. The research on foamed quantum dots can replace the original QD film + DP structure, saving assembly time, reducing installation steps, reducing employee fatigue, and improving the a priori nature of the picture after assembly. In addition, the extruded diffusion plate of the present invention can be matched multiple times and has stronger compatibility, which solves the technical problem that most of the existing diffusion plate extrusion methods are single-layer extrusion and cannot be compatible with more models and types. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.
[0015] Figure 1 It is a schematic structural diagram of an inert gas foamed quantum dot diffusion plate according to the first embodiment of the present invention.
[0016] Figure 2 It is a flowchart of the preparation process of the inert gas foamed quantum dot diffusion plate according to the first embodiment of the present invention.
[0017] In the figure: 101 - quantum dots, 102 - first substrate layer, 103 - second main layer, 104 - third substrate layer. DETAILED DESCRIPTION
[0018] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.
[0019] First embodiment: See also Figure 1 , Figure 1 It is a structural schematic diagram of an inert gas foamed quantum dot diffusion plate of the first embodiment of the present invention. The present invention provides an inert gas foamed quantum dot diffusion plate, including a first substrate layer 102, below which a second main layer 103 and a third substrate layer 104 are sequentially arranged from top to bottom.
[0020] In this embodiment, the present invention replaces the die head on the basis of the original single-layer extrusion, and changes it to three-layer extrusion. The upper and lower layers are extruded for diffusion plate particles, and the middle layer is extruded for quantum dot particles. Foaming treatment is performed while the upper and lower layers are extruded, so that the raw materials on the upper and lower surfaces of the quantum dot diffusion plate are in a bubble state, thereby improving the brightness of the diffusion plate, reducing the density of the diffusion plate, saving the use of raw materials, and reducing costs. The research on foamed quantum dots 101 can replace the original QD film + DP structure, saving assembly time, reducing installation steps, reducing employee fatigue, and improving the a priori nature of the picture after assembly. In addition, the diffusion plate extruded by the present invention can be matched multiple times, and has stronger compatibility, which solves the technical problem that most of the existing diffusion plate extrusion methods are single-layer extrusion and cannot be compatible with more models and types.
[0021] Among them, the first substrate layer 102 and the third substrate layer 104 are both extrusion layers of diffusion plate particles, and the second main layer 103 is an extrusion layer of quantum dot particles. The first substrate layer 102 and the third substrate layer 104 are foamed by adding a foaming agent while the diffusion plate particles are extruded, so that the upper and lower layers of the diffusion plate are simultaneously in a foamed state during the extrusion process, thereby reducing the density of the diffusion plate, saving the use of raw materials, and reducing costs.
[0022] Secondly, the density of the inert gas foamed quantum dot diffusion plate is 10-40kg / m³, which is 1 / 3 to 1 / 4 of that of ordinary foam materials. Since it has multiple small chambers and gas diffusion channels inside, the strength of the material is maintained and it can withstand certain pressure and deformation.
[0023] When using an inert gas foamed quantum dot diffusion plate of the present embodiment, the diffusion plate replaces the die head on the basis of the original single-layer extrusion and changes to three-layer extrusion. The upper and lower layers are extruded from the diffusion plate particles, and the middle layer is extruded from the quantum dot particles. The upper and lower layers are foamed at the same time as they are extruded, so that the raw materials on the upper and lower surfaces of the quantum dot diffusion plate are in a bubble state, thereby improving the brightness of the diffusion plate, reducing the density of the diffusion plate, saving the use of raw materials, and reducing costs. The research on foamed quantum dots 101 can replace the original QD film + DP structure, saving assembly hours, reducing installation steps, reducing employee fatigue, and improving the a priori nature of the picture after assembly. In addition, the diffusion plate can be matched multiple times and has stronger compatibility, which solves the technical problem that most of the existing diffusion plate extrusion methods are single-layer extrusion and cannot be compatible with more models and types.
[0024] Second embodiment: Based on the first embodiment, please refer to Figure 2 , Figure 2 1 is a process flow chart of a preparation process of a quantum dot diffusion plate foamed with an inert gas according to a first embodiment of the present invention. The present invention also provides a preparation process of a quantum dot diffusion plate foamed with an inert gas, comprising the following steps: S101, placing diffusion plate particles, quantum dot particles and a foaming agent into different containers respectively, and then melting the diffusion plate particles and the quantum dot particles at high temperatures respectively.
[0025] S102 , after melting, extruding the diffusion plate particles and the quantum dot particles in a structure in which the upper and lower layers are both the diffusion plate particles and the middle layer is the quantum dot particles.
[0026] Specifically, the extrusion process of the diffusion plate particles and the quantum dot particles is: The diffusion plate particles and the quantum dot particles of the upper, middle and lower layers are melted at high temperatures respectively through the twin-screw structure of the extruder; After melting, the particles are extruded in a structure in which the upper and lower layers are both the diffusion plate particles and the middle layer is the quantum dot particles.
[0027] Among them, the extrusion temperature of the diffusion plate particles and the quantum dot particles is: 90-230°C, specifically, the extrusion temperature of the first substrate layer 102 is controlled at 90°C, 220°C or 230°C, the extrusion temperature of the second main layer 103 is controlled at 220°C or 230°C, and the extrusion temperature of the third substrate layer 104 is controlled at 220°C.
[0028] S103, while the diffusion plate particles of the upper and lower layers are being extruded, a foaming agent is added to the diffusion plate particles of the upper and lower layers, and the foaming agent is allowed to foam inside the diffusion plate particles at high temperature.
[0029] Specifically, the foaming agent is polystyrene, and polystyrene divides the interior of the diffusion plate particles into tens of thousands of small gas chambers through a number of small holes. Soluble gas is added to the foaming agent and diffused to a higher temperature area through the heating of the screw to form a good foaming effect, wherein the added soluble gas is chlorofluorocarbons (CFCs), hydrofluorocarbons (HCFCs) or nitrogen (N2).
[0030] When using the preparation process of an inert gas foamed quantum dot diffusion plate of the present embodiment, the diffusion plate particles, quantum dot particles and foaming agent are respectively placed in different containers, and the diffusion plate particles and quantum dot particles of the upper, middle and lower layers (the first substrate layer 102, the second main layer 103 and the third substrate layer 104, respectively) are melted at high temperature through the twin-screw structure of the extrusion line during the extrusion process, and the upper and lower layers (the first substrate layer 102 and the third substrate layer 104) are both a mixture of the diffusion plate particles and the foaming agent, and the extrusion section temperature is controlled at 90-230°C (the extrusion temperature of the first substrate layer 102 is controlled at 90°C, 220°C or 230°C, the extrusion temperature of the second main layer 103 is controlled at 220°C or 230°C, and the extrusion temperature of the third substrate layer is controlled at 100°C or 100°C). The extrusion temperature of 104 is controlled at 220℃). The foaming agent is foamed inside the diffusion plate by high temperature. Polystyrene (foaming agent) divides its interior into tens of thousands of small gas chambers through several small holes. The connecting channels between these small chambers are also called gas diffusion channels, which are important features of the foaming diffusion plate. When air molecules enter the small chambers of the foaming diffusion plate, they will spread between different small chambers due to the diffusion effect. In this way, the energy transfer effect is formed. Since the gas diffusion channel of the foaming diffusion plate is very small, the movement of molecules in the channel is hindered, so that multiple collisions occur in the gas diffusion channel and the speed of heat transfer is reduced. In this way, with the increase in the number of small chambers, the energy transfer process is continuously strengthened, which effectively reduces the heat transfer coefficient.
[0031] To sum up, based on the original single-layer extrusion, the present invention replaces the die head and changes it to three-layer extrusion. The upper and lower layers are extruded for diffusion plate particles, and the middle layer is extruded for quantum dot particles. Foaming treatment is performed while the upper and lower layers are extruded, so that the raw materials on the upper and lower surfaces of the quantum dot diffusion plate are in a bubble state, thereby improving the brightness of the diffusion plate, reducing the density of the diffusion plate, saving the use of raw materials, and reducing costs. The research on foamed quantum dots 101 can replace the original QD film + DP structure, saving assembly time, reducing installation steps, reducing employee fatigue, and improving the a priori of the picture after assembly. In addition, the diffusion plate extruded by the present invention can be matched multiple times, and has stronger compatibility, which solves the technical problem that most of the existing diffusion plate extrusion methods are single-layer extrusion and cannot be compatible with more models and types.
[0032] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.
Claims
1. An inert gas foamed quantum dot diffusion plate, characterized in that: It comprises a first substrate layer, a second main layer and a third substrate layer are sequentially arranged below the first substrate layer from top to bottom, the first substrate layer and the third substrate layer are both extrusion layers of diffusion plate particles, and the second main layer is an extrusion layer of quantum dot particles; The first substrate layer and the third substrate layer are foamed by adding a foaming agent while the diffusion plate particles are extruded.
2. The inert gas foamed quantum dot diffusion plate according to claim 1, characterized in that: The density of the inert gas foamed quantum dot diffusion plate is 10-40 kg / m³.
3. A process for preparing an inert gas foamed quantum dot diffusion plate, applied to the inert gas foamed quantum dot diffusion plate according to claim 1 or claim 2, characterized in that: The following steps are involved: The diffusion plate particles, quantum dot particles and foaming agent are placed in different containers respectively, and then the diffusion plate particles and the quantum dot particles are melted at high temperature respectively; After melting, the diffusion plate particles and the quantum dot particles are extruded according to a structure in which the upper and lower layers are both the diffusion plate particles and the middle layer is the quantum dot particles; While the diffusion plate particles of the upper and lower layers are being extruded, a foaming agent is added to the diffusion plate particles of the upper and lower layers, and the foaming agent is foamed inside the diffusion plate particles by high temperature.
4. The process for preparing the inert gas foamed quantum dot diffusion plate according to claim 3, characterized in that: The extrusion process of the diffusion plate particles and the quantum dot particles is: The diffusion plate particles and the quantum dot particles of the upper, middle and lower layers are melted at high temperatures respectively through the twin-screw structure of the extruder; After melting, the particles are extruded in a structure in which the upper and lower layers are both the diffusion plate particles and the middle layer is the quantum dot particles.
5. The process for preparing the inert gas foamed quantum dot diffusion plate according to claim 4, characterized in that: The extrusion temperature of the diffusion plate particles and the quantum dot particles is 90-230°C.
6. The process for preparing the inert gas foamed quantum dot diffusion plate according to claim 3, characterized in that: The foaming agent is polystyrene, and the polystyrene divides the interior of the diffusion plate particles into tens of thousands of small gas chambers through a plurality of small holes.
7. The process for preparing the inert gas foamed quantum dot diffusion plate according to claim 6, characterized in that: Soluble gas is added to the foaming agent and diffused to a higher temperature region through the heating of the screw, thereby forming a good foaming effect.