A reflective film containing fluorescent polymer microspheres and preparation method thereof

Abstract

The present invention discloses a reflective film containing fluorescent polymer microspheres and a preparation method thereof, comprising an adhesive layer, a reflective layer, and a substrate layer, wherein the upper surface of the adhesive layer is connected to the lower surface of the reflective layer, the upper surface of the reflective layer is connected to the lower surface of the substrate layer, and further comprising a fluorescent microstructure layer and a barrier layer, wherein the upper surface of the substrate layer is connected to the lower surface of the fluorescent microstructure layer, the fluorescent microstructure layer is provided with fluorescent polymer microspheres, the fluorescent polymer microspheres are provided with fluorescent substances, and the fluorescent microstructure layer is formed by the distribution of fine cubic pyramids, and the fine cubic pyramids are connected to the lower surface of the barrier layer. Pasting the reflective film containing fluorescent polymer microspheres to the welding strip portion can improve the conversion efficiency of solar energy, and can convert or absorb the short-wavelength spectrum in sunlight, thereby improving the conversion efficiency of solar cells.

Description

Technical Field

[0001] The invention relates to the technical field of reflective films, and in particular to a reflective film containing fluorescent polymer microspheres and a preparation method thereof. Background Art

[0002] As a green and environmentally friendly energy source, solar energy is widely used in various fields. Photovoltaic modules are semiconductor devices that directly convert sunlight into electrical energy. Traditional soldering strips are directly soldered to the cells and connect adjacent cells to each other. Since the soldering strips themselves have a certain width, they will cover part of the light-receiving area of ​​the cells, thereby affecting the utilization rate of light. In order to improve the conversion efficiency of solar energy in the soldering strip area, the current solution is to attach reflective strips to the surface of the soldering strips. However, due to factors such as the current reflective strip structure, it is impossible to convert or absorb the short-wavelength spectrum in sunlight. Therefore, it is necessary to improve or optimize the existing reflective strips. Summary of the invention

[0003] The present invention aims to solve the problems in the prior art such as low solar energy conversion efficiency at the welding strip part and the reflective strip structure, which make it impossible to convert or absorb the short-wavelength spectrum of sunlight, and provides a new reflective film containing fluorescent polymer microspheres and a preparation method thereof.

[0004] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0005] A reflective film containing fluorescent polymer microspheres comprises an adhesive layer, a reflective layer, and a substrate layer, wherein the upper surface of the adhesive layer is connected to the lower surface of the reflective layer, and the upper surface of the reflective layer is connected to the lower surface of the substrate layer. The reflective film also comprises a fluorescent microstructure layer and a barrier layer, wherein the upper surface of the substrate layer is connected to the lower surface of the fluorescent microstructure layer, the fluorescent microstructure layer is provided with fluorescent polymer microspheres, the fluorescent polymer microspheres are provided with fluorescent substances, and the fluorescent microstructure layer is formed by the distribution of fine cubic pyramids, and the fine cubic pyramids are connected to the lower surface of the barrier layer.

[0006] The adhesive layer is used to bond the reflective film to other objects; the reflective layer is used to reflect sunlight and block water vapor and oxygen in the environment to extend the life of the reflective film; the substrate layer has good deformation resistance and load-bearing capacity; the fluorescent microstructure layer provides a space or carrier for the fluorescent polymer microspheres and the barrier layer; the fluorescent substance set in the fluorescent polymer microspheres can convert the short-wavelength spectrum into visible light and near-infrared light, which improves the conversion efficiency of solar cells, and the fine cubic pyramids can increase the surface area in contact with sunlight and improve the utilization rate of sunlight; the barrier layer can protect the fluorescent microstructure layer and extend the life of the reflective film, and the barrier layer and the reflective layer have a barrier effect on water vapor and oxygen from both sides of the fluorescent microstructure layer, that is, protect the fluorescent substance in the middle and prevent it from oxidation. The fine cubic pyramid structure has the characteristics of excellent reflective performance, good stability and high processing efficiency. Pasting the reflective film containing fluorescent polymer microspheres to the welding strip can improve the conversion efficiency of solar energy, and can convert or absorb the short-wavelength spectrum in sunlight, thereby improving the conversion efficiency of solar cells.

[0007] Preferably, in the reflective film containing fluorescent polymer microspheres, the fluorescent substance is quantum dots, the barrier layer is a silicon oxide layer, and the thickness of the silicon oxide layer is 0.05-0.6 um.

[0008] Quantum dots have a significant size effect due to the wonderful rules of quantum mechanics. Basically, light above a specific threshold can be absorbed, so the conversion rate of sunlight can be further improved. The silicon oxide layer has fatigue resistance and aging resistance, which further improves the fatigue and aging resistance of the reflective film containing fluorescent polymer microspheres. The thickness of the silicon oxide layer is set to 0.05-0.6um, which can not only ensure that the silicon oxide layer can play the role of fatigue and aging resistance, but also avoid the silicon oxide layer being too thick and affecting the product's conversion effect on sunlight.

[0009] Preferably, in the reflective film containing fluorescent polymer microspheres, the quantum dots are carbon quantum dots, the absorption peak of the carbon quantum dots is 260-450nm, and the emission peak of the carbon quantum dots is 500-720nm.

[0010] Carbon quantum dots have strong confinement and edge effects, which further improve the conversion rate of sunlight.

[0011] Preferably, in the reflective film containing fluorescent polymer microspheres, the thickness of the adhesive layer is 5 to 30 um, and the viscosity of the adhesive layer is 50 to 250 N / in.

[0012] The thickness of the adhesive layer is set to 5-30um, which can not only ensure the bonding requirements of the adhesive layer with other objects, but also save the raw materials of the adhesive layer and reduce costs. When the viscosity of the adhesive layer is 50-250N / in, it can not only ensure the bonding performance of the adhesive layer, but also reduce costs.

[0013] Preferably, in the reflective film containing fluorescent polymer microspheres, the reflective layer is an aluminum-plated layer, and the thickness of the reflective layer is 0.6-3 um.

[0014] The aluminum coating not only has good reflective effect and low cost, but also has the function of blocking water vapor and oxygen in the environment; and the aluminum coating layer cooperates with the barrier layer to protect the fluorescent material in the fluorescent microstructure layer from both sides.

[0015] Preferably, in the reflective film containing fluorescent polymer microspheres, the substrate layer is an ethylene terephthalate layer, and the ethylene terephthalate layer has a light transmittance of 88-95% and a haze of 10-20%.

[0016] The ethylene terephthalate layer has good creep resistance, fatigue resistance, friction resistance and dimensional stability; the light transmittance of the ethylene terephthalate layer is 88-95%, which ensures the light transmittance effect and has low cost; the haze of the ethylene terephthalate layer is 10-20%, which can achieve multiple repeated reflections of diffuse light. Therefore, the use of the ethylene terephthalate layer in the substrate layer can further improve the comprehensive performance of the reflective film containing fluorescent polymer microspheres.

[0017] Preferably, in the reflective film containing fluorescent polymer microspheres, the fine cubic pyramids include large pyramids and small pyramids, and the large pyramids and small pyramids are arranged at intervals from each other.

[0018] The large cones and the small cones are arranged at intervals from each other to further improve the reflective performance and stability of the reflective film containing fluorescent polymer microspheres.

[0019] Preferably, in the reflective film containing fluorescent polymer microspheres, the distance from the bottom to the top of the large cone is 6.1 to 12 um, and the distance from the bottom to the top of the small cone is 3 to 6 um.

[0020] When the distance from the bottom to the top of the large cone is set to 6.1 to 12 um and the distance from the bottom to the top of the small cone is set to 3 to 6 um, the fluorescent substance can better convert the short wavelength spectrum into visible light and near infrared light, further improving the conversion efficiency of the solar cell.

[0021] Preferably, in the reflective film containing fluorescent polymer microspheres, the distance between the top of the adjacent large cone and the top of the adjacent small cone is 2 to 6 um.

[0022] When the distance between the top of the adjacent large cone and the top of the small cone is 2 to 6 um, not only is the difficulty coefficient of the processing technology low, but the conversion efficiency of the solar cell can also be further improved.

[0023] Preferably, in the reflective film containing fluorescent polymer microspheres, the diameter of the fluorescent polymer microspheres is 0.2-0.6 um.

[0024] When the diameter of the fluorescent polymer microspheres is 0.2 to 0.6 um, it is easier to ensure the uniformity of the fluorescent polymer microspheres, and the conversion rate of short-wavelength spectrum into visible light and near-infrared light is higher, further improving the conversion efficiency of solar cells.

[0025] Preferably, the method for preparing the reflective film containing fluorescent polymer microspheres described above comprises the following preparation steps:

[0026] (a) taking a fluorescent substance and a high refractive index resin in a ratio of 2:8 to 6:4 by mass to form a fluorescent resin containing a fluorescent substance, and then injecting the fluorescent resin containing a fluorescent substance into the A channel of the dual-channel microfluidic syringe pump through the A port provided on the dual-channel microfluidic syringe pump, taking methyl silicone oil and injecting the methyl silicone oil into the B channel of the dual-channel microfluidic syringe pump through the B port provided on the dual-channel microfluidic syringe pump, wherein the propulsion speed ratio of the A channel to the B channel is 1:7 to 1:10, the fluorescent resin containing a fluorescent substance and the methyl silicone oil converge into droplets through the outlet provided on the dual-channel microfluidic syringe pump, and the droplets are cured by ultraviolet light to form fluorescent polymer microspheres containing a fluorescent substance, and then filtering and washing the fluorescent polymer microspheres containing a fluorescent substance to remove the residual methyl silicone oil on the surface of the fluorescent polymer microspheres containing a fluorescent substance;

[0027] (b) mixing the fluorescent polymer microspheres containing the fluorescent substance and the low refractive index resin in a mass ratio of 3:7 to 5:5 to form a fluorescent resin containing the fluorescent polymer microspheres;

[0028] (c) taking a substrate layer, and forming a reflective layer on the lower surface of the substrate layer by vacuum evaporation, wherein the vacuum pressure is 5×10-1Pa to 7×10-1Pa, and then performing corona treatment on the side of the reflective layer that is not in contact with the substrate layer;

[0029] (d) coating the fluorescent resin containing fluorescent polymer microspheres on the upper surface of the substrate layer through a microstructure roller provided in a coating machine to form a fluorescent microstructure layer containing fluorescent polymer microspheres distributed by fine cubic pyramids, wherein the line speed of the coating machine is 5 to 10 m / min;

[0030] (e) vapor depositing a layer of silicon oxide on the upper surface of the fluorescent microstructure layer containing fluorescent polymer microspheres to form a barrier layer;

[0031] (f) coating an adhesive on the lower surface of the reflective layer to form an adhesive layer, thereby finally obtaining a reflective film containing fluorescent polymer microspheres.

[0032] Step (a) is used to prepare fluorescent polymer microspheres containing fluorescent substances, and step (b) is used to prepare fluorescent resin containing fluorescent polymer microspheres to provide raw materials for step (d); the corona treatment in step (c) is to increase the friction coefficient of the surface of the reflective layer and improve the bonding strength between the adhesive layer and the reflective layer in step (f); step (d) prepares a fluorescent microstructure layer containing fluorescent polymer microspheres, and the fluorescent substances arranged in the fluorescent microstructure layer can convert short-wavelength spectrum into visible light and near-infrared light, thereby improving the conversion efficiency of solar cells, and the microstructure roller forms fine cubic corner pyramids on the upper surface of the fluorescent microstructure layer, thereby increasing the contact area with sunlight and improving the utilization rate of sunlight; step (e) is used to prepare a barrier layer, and the barrier layer protects the fluorescent microstructure layer, thereby extending the life of the reflective film containing fluorescent polymer microspheres; step (f) applies an adhesive on the lower surface of the reflective layer to form an adhesive layer, so that the reflective film containing fluorescent polymer microspheres can be bonded to the surface of other objects.

[0033] Preferably, in the above-mentioned method for preparing a reflective film containing fluorescent polymer microspheres, the refractive index of the high-refractive index resin in step (a) is 1.61-1.68, and the refractive index of the low-refractive index resin in step (b) is 1.34-1.41.

[0034] When the refractive index of the high refractive index resin in step (a) is 1.61-1.68 and the refractive index of the low refractive index resin in step (b) is 1.34-1.41, the difference in refractive index between the high refractive index resin and the low refractive index resin is utilized to realize circular refraction of sunlight between fluorescent substances, thereby improving the efficiency of converting sunlight ultraviolet light into visible light. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 It is a schematic diagram of the structure of the fluorescent microstructure layer in the present invention. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-2 The present invention is further described in detail with specific embodiments, but they are not intended to limit the present invention:

[0038] Example 1

[0039] A reflective film containing fluorescent polymer microspheres, comprising an adhesive layer 1, a reflective layer 2, and a substrate layer 3, wherein the upper surface of the adhesive layer 1 is connected to the lower surface of the reflective layer 2, and the upper surface of the reflective layer 2 is connected to the lower surface of the substrate layer 3. The film also comprises a fluorescent microstructure layer 4 and a barrier layer 5, wherein the upper surface of the substrate layer 3 is connected to the lower surface of the fluorescent microstructure layer 4, fluorescent polymer microspheres 6 are arranged in the fluorescent microstructure layer 4, fluorescent substances 7 are arranged in the fluorescent polymer microspheres 6, and the fluorescent microstructure layer 4 is formed by the distribution of fine cubic pyramids 41, and the fine cubic pyramids 41 are connected to the lower surface of the barrier layer 5.

[0040] Preferably, the fluorescent substance 7 is quantum dots, the barrier layer 5 is a silicon oxide layer, and the thickness of the silicon oxide layer is 0.05 um.

[0041] Preferably, the quantum dots are carbon quantum dots, the absorption peak of the carbon quantum dots is 260 nm, and the emission peak of the carbon quantum dots is 500 nm.

[0042] Preferably, the thickness of the adhesive layer 1 is 5-30 um, and the viscosity of the adhesive layer 1 is 50 N / in.

[0043] Preferably, the reflective layer 2 is an aluminum-plated layer, and the thickness of the reflective layer 2 is 0.6 um.

[0044] Preferably, the substrate layer 3 is a polyethylene terephthalate layer, and the polyethylene terephthalate layer has a light transmittance of 88% and a haze of 10%.

[0045] Preferably, the fine cubic corner pyramid 41 includes a large pyramid 411 and a small pyramid 412, and the large pyramid 411 and the small pyramid 412 are spaced apart from each other.

[0046] Preferably, the distance from the bottom to the top of the large cone 411 is 6.1 um, and the distance from the bottom to the top of the small cone 412 is 3 um.

[0047] Preferably, the distance between the top of the adjacent large cone 411 and the top of the adjacent small cone 412 is 2 um.

[0048] Preferably, the diameter of the fluorescent polymer microsphere 6 is 0.2 um.

[0049] Preferably, the method comprises the following preparation steps:

[0050] (a) taking a fluorescent substance 7 and a high refractive index resin in a ratio of 2:8 by mass to form a fluorescent resin containing the fluorescent substance 7, and then injecting the fluorescent resin containing the fluorescent substance 7 into the A channel of the dual-channel microfluidic injection pump through the A port provided on the dual-channel microfluidic injection pump, taking methyl silicone oil and injecting the methyl silicone oil into the B channel of the dual-channel microfluidic injection pump through the B port provided on the dual-channel microfluidic injection pump, wherein the propulsion speed ratio of the A channel to the B channel is 1:7, the fluorescent resin containing the fluorescent substance 7 and the methyl silicone oil converge into droplets through the outlet provided on the dual-channel microfluidic injection pump, and the droplets are cured by ultraviolet light to form fluorescent polymer microspheres 6 containing the fluorescent substance 7, and then filtering and washing the fluorescent polymer microspheres 6 containing the fluorescent substance 7 to remove the residual methyl silicone oil on the surface of the fluorescent polymer microspheres 6 containing the fluorescent substance 7;

[0051] (b) mixing the fluorescent polymer microspheres 6 containing the fluorescent substance 7 and the low refractive index resin in a mass ratio of 3:7 to form a fluorescent resin containing the fluorescent polymer microspheres 6;

[0052] (c) taking a substrate layer 3, and forming a reflective layer 2 on the lower surface of the substrate layer 3 by vacuum evaporation, wherein the vacuum pressure is 5×10-1 Pa, and then performing corona treatment on the side of the reflective layer 2 that is not in contact with the substrate layer 3;

[0053] (d) coating the fluorescent resin containing fluorescent polymer microspheres 6 on the upper surface of the substrate layer 3 through a microstructure roller provided in a coating machine to form a fluorescent microstructure layer 4 containing fluorescent polymer microspheres 6 distributed with fine cubic pyramids 41, wherein the line speed of the coating machine is 5 m / min;

[0054] (e) vapor-depositing a layer of silicon oxide on the upper surface of the fluorescent microstructure layer 4 containing the fluorescent polymer microspheres 6 to form a barrier layer 5;

[0055] (f) coating an adhesive on the lower surface of the reflective layer 2 to form an adhesive layer 1, thereby finally obtaining a reflective film containing fluorescent polymer microspheres.

[0056] Preferably, the refractive index of the high refractive index resin in step (a) is 1.61, and the refractive index of the low refractive index resin in step (b) is 1.34.

[0057] Example 2

[0058] A reflective film containing fluorescent polymer microspheres, comprising an adhesive layer 1, a reflective layer 2, and a substrate layer 3, wherein the upper surface of the adhesive layer 1 is connected to the lower surface of the reflective layer 2, and the upper surface of the reflective layer 2 is connected to the lower surface of the substrate layer 3. The film also comprises a fluorescent microstructure layer 4 and a barrier layer 5, wherein the upper surface of the substrate layer 3 is connected to the lower surface of the fluorescent microstructure layer 4, fluorescent polymer microspheres 6 are arranged in the fluorescent microstructure layer 4, fluorescent substances 7 are arranged in the fluorescent polymer microspheres 6, and the fluorescent microstructure layer 4 is formed by the distribution of fine cubic pyramids 41, and the fine cubic pyramids 41 are connected to the lower surface of the barrier layer 5.

[0059] Preferably, the fluorescent substance 7 is quantum dots, the barrier layer 5 is a silicon oxide layer, and the thickness of the silicon oxide layer is 0.3 um.

[0060] Preferably, the quantum dots are carbon quantum dots, the absorption peak of the carbon quantum dots is 320 nm, and the emission peak of the carbon quantum dots is 610 nm.

[0061] Preferably, the thickness of the adhesive layer 1 is 16 um, and the viscosity of the adhesive layer 1 is 192 N / in.

[0062] Preferably, the reflective layer 2 is an aluminum-plated layer, and the thickness of the reflective layer 2 is 2.2 um.

[0063] Preferably, the substrate layer 3 is a polyethylene terephthalate layer, and the polyethylene terephthalate layer has a light transmittance of 90% and a haze of 16%.

[0064] Preferably, the fine cubic corner pyramid 41 includes a large pyramid 411 and a small pyramid 412, and the large pyramid 411 and the small pyramid 412 are spaced apart from each other.

[0065] Preferably, the distance from the bottom to the top of the large cone 411 is 8.7 um, and the distance from the bottom to the top of the small cone 412 is 4 um.

[0066] Preferably, the distance between the top of the adjacent large cone 411 and the top of the adjacent small cone 412 is 3.6 um.

[0067] Preferably, the diameter of the fluorescent polymer microsphere 6 is 0.34 um.

[0068] Preferably, the method comprises the following preparation steps:

[0069] (a) taking a fluorescent substance 7 and a high refractive index resin in a ratio of 4:6 by mass to form a fluorescent resin containing the fluorescent substance 7, and then injecting the fluorescent resin containing the fluorescent substance 7 into the A channel of the dual-channel microfluidic injection pump through the A port provided on the dual-channel microfluidic injection pump, taking methyl silicone oil and injecting the methyl silicone oil into the B channel of the dual-channel microfluidic injection pump through the B port provided on the dual-channel microfluidic injection pump, wherein the propulsion speed ratio of the A channel to the B channel is 1:8, the fluorescent resin containing the fluorescent substance 7 and the methyl silicone oil converge into droplets through the outlet provided on the dual-channel microfluidic injection pump, and the droplets are cured by ultraviolet light to form fluorescent polymer microspheres 6 containing the fluorescent substance 7, and then filtering and washing the fluorescent polymer microspheres 6 containing the fluorescent substance 7 to remove the methyl silicone oil remaining on the surface of the fluorescent polymer microspheres 6 containing the fluorescent substance 7;

[0070] (b) taking the fluorescent polymer microspheres 6 containing the fluorescent substance 7 and the low refractive index resin in a mass ratio of 3:7 to 5:5 and mixing them evenly to form a fluorescent resin containing the fluorescent polymer microspheres 6;

[0071] (c) taking a substrate layer 3, and forming a reflective layer 2 on the lower surface of the substrate layer 3 by vacuum evaporation, wherein the vacuum pressure is 6×10-1 Pa, and then performing corona treatment on the side of the reflective layer 2 that is not in contact with the substrate layer 3;

[0072] (d) coating the fluorescent resin containing fluorescent polymer microspheres 6 on the upper surface of the substrate layer 3 through a microstructure roller provided in a coating machine to form a fluorescent microstructure layer 4 containing fluorescent polymer microspheres 6 distributed with fine cubic pyramids 41, wherein the line speed of the coating machine is 6.2 m / min;

[0073] (e) vapor-depositing a layer of silicon oxide on the upper surface of the fluorescent microstructure layer 4 containing the fluorescent polymer microspheres 6 to form a barrier layer 5;

[0074] (f) coating an adhesive on the lower surface of the reflective layer 2 to form an adhesive layer 1, thereby finally obtaining a reflective film containing fluorescent polymer microspheres.

[0075] Preferably, the refractive index of the high refractive index resin in step (a) is 1.64, and the refractive index of the low refractive index resin in step (b) is 1.38.

[0076] Example 3

[0077] A reflective film containing fluorescent polymer microspheres, comprising an adhesive layer 1, a reflective layer 2, and a substrate layer 3, wherein the upper surface of the adhesive layer 1 is connected to the lower surface of the reflective layer 2, and the upper surface of the reflective layer 2 is connected to the lower surface of the substrate layer 3. The film also comprises a fluorescent microstructure layer 4 and a barrier layer 5, wherein the upper surface of the substrate layer 3 is connected to the lower surface of the fluorescent microstructure layer 4, fluorescent polymer microspheres 6 are arranged in the fluorescent microstructure layer 4, fluorescent substances 7 are arranged in the fluorescent polymer microspheres 6, and the fluorescent microstructure layer 4 is formed by the distribution of fine cubic pyramids 41, and the fine cubic pyramids 41 are connected to the lower surface of the barrier layer 5.

[0078] Preferably, the fluorescent substance 7 is quantum dots, the barrier layer 5 is a silicon oxide layer, and the thickness of the silicon oxide layer is 0.6 um.

[0079] Preferably, the quantum dots are carbon quantum dots, the absorption peak of the carbon quantum dots is 450nm, and the emission peak of the carbon quantum dots is 720nm.

[0080] Preferably, the thickness of the adhesive layer 1 is 30 um, and the viscosity of the adhesive layer 1 is 250 N / in.

[0081] Preferably, the reflective layer 2 is an aluminum-plated layer, and the thickness of the reflective layer 2 is 3 um.

[0082] Preferably, the substrate layer 3 is a polyethylene terephthalate layer, and the light transmittance of the polyethylene terephthalate layer is 95% and the haze is 20%.

[0083] Preferably, the fine cubic corner pyramid 41 includes a large pyramid 411 and a small pyramid 412, and the large pyramid 411 and the small pyramid 412 are spaced apart from each other.

[0084] Preferably, the distance from the bottom to the top of the large cone 411 is 12 um, and the distance from the bottom to the top of the small cone 412 is 6 um.

[0085] Preferably, the distance between the top of the adjacent large cone 411 and the top of the adjacent small cone 412 is 6 um.

[0086] Preferably, the diameter of the fluorescent polymer microsphere 6 is 0.6 um.

[0087] Preferably, the method comprises the following preparation steps:

[0088] (a) taking a fluorescent substance 7 and a high refractive index resin in a mass ratio of 6:4 to form a fluorescent resin containing the fluorescent substance 7, and then injecting the fluorescent resin containing the fluorescent substance 7 into the A channel of the dual-channel microfluidic injection pump through the A port provided on the dual-channel microfluidic injection pump, taking methyl silicone oil and injecting the methyl silicone oil into the B channel of the dual-channel microfluidic injection pump through the B port provided on the dual-channel microfluidic injection pump, wherein the propulsion speed ratio of the A channel to the B channel is 1:10, and the fluorescent resin containing the fluorescent substance 7 and the methyl silicone oil converge into droplets through the outlet provided on the dual-channel microfluidic injection pump, and the droplets are cured by ultraviolet light to form fluorescent polymer microspheres 6 containing the fluorescent substance 7, and then filtering and washing the fluorescent polymer microspheres 6 containing the fluorescent substance 7 to remove the methyl silicone oil remaining on the surface of the fluorescent polymer microspheres 6 containing the fluorescent substance 7;

[0089] (b) mixing the fluorescent polymer microspheres 6 containing the fluorescent substance 7 and the low refractive index resin in a mass ratio of 5:5 to form a fluorescent resin containing the fluorescent polymer microspheres 6;

[0090] (c) taking a substrate layer 3, and forming a reflective layer 2 on the lower surface of the substrate layer 3 by vacuum evaporation, wherein the vacuum pressure is 7×10-1 Pa, and then performing corona treatment on the side of the reflective layer 2 that is not in contact with the substrate layer 3;

[0091] (d) coating the fluorescent resin containing fluorescent polymer microspheres 6 on the upper surface of the substrate layer 3 through a microstructure roller provided in a coating machine to form a fluorescent microstructure layer 4 containing fluorescent polymer microspheres 6 distributed with fine cubic pyramids 41, wherein the line speed of the coating machine is 10 m / min;

[0092] (e) vapor-depositing a layer of silicon oxide on the upper surface of the fluorescent microstructure layer 4 containing the fluorescent polymer microspheres 6 to form a barrier layer 5;

[0093] (f) coating an adhesive on the lower surface of the reflective layer 2 to form an adhesive layer 1, thereby finally obtaining a reflective film containing fluorescent polymer microspheres.

[0094] Preferably, the refractive index of the high refractive index resin in step (a) is 1.68, and the refractive index of the low refractive index resin in step (b) is 1.41.

[0095] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A reflective film containing fluorescent polymer microspheres, comprising an adhesive layer (1), a reflective layer (2), and a substrate layer (3), wherein the upper surface of the adhesive layer (1) is connected to the lower surface of the reflective layer (2), and the upper surface of the reflective layer (2) is connected to the lower surface of the substrate layer (3), characterized in that: The invention also comprises a fluorescent microstructure layer (4) and a barrier layer (5); the upper surface of the substrate layer (3) is connected to the lower surface of the fluorescent microstructure layer (4); fluorescent polymer microspheres (6) are arranged in the fluorescent microstructure layer (4); fluorescent substances (7) are arranged in the fluorescent polymer microspheres (6); the fluorescent substances (7) can convert short-wavelength spectra into visible light and near-infrared light; and the fluorescent microstructure layer (4) is formed by the distribution of fine cubic pyramids (41); and the fine cubic pyramids (41) are connected to the lower surface of the barrier layer (5).

2. The reflective film containing fluorescent polymer microspheres according to claim 1, characterized in that: The fluorescent substance (7) is a quantum dot, the barrier layer (5) is a silicon oxide layer, and the thickness of the silicon oxide layer is 0.05-0.6 um.

3. The reflective film containing fluorescent polymer microspheres according to claim 2, characterized in that: The quantum dots are carbon quantum dots, the absorption peak of the carbon quantum dots is 260-450nm, and the emission peak of the carbon quantum dots is 500-720nm.

4. The reflective film containing fluorescent polymer microspheres according to claim 1, characterized in that: The thickness of the adhesive layer (1) is 5-30 μm, and the viscosity of the adhesive layer (1) is 50-250 N / in.

5. The reflective film containing fluorescent polymer microspheres according to claim 1, characterized in that: The reflective layer (2) is an aluminum-plated layer, and the thickness of the reflective layer (2) is 0.6-3 um.

6. The reflective film containing fluorescent polymer microspheres according to claim 1, characterized in that: The substrate layer (3) is a polyethylene terephthalate layer, and the polyethylene terephthalate layer has a light transmittance of 88-95% and a haze of 10-20%.

7. The reflective film containing fluorescent polymer microspheres according to claim 1, characterized in that: The fine cubic corner pyramid (41) comprises a large pyramid (411) and a small pyramid (412), and the large pyramid (411) and the small pyramid (412) are arranged at intervals from each other.

8. The reflective film containing fluorescent polymer microspheres according to claim 7, characterized in that: The distance from the bottom to the top of the large cone (411) is 6.1 to 12 um, and the distance from the bottom to the top of the small cone (412) is 3 to 6 um.

9. The reflective film containing fluorescent polymer microspheres according to claim 7, characterized in that: The distance between the top of the adjacent large cone (411) and the top of the adjacent small cone (412) is 2-6 um.

10. The reflective film containing fluorescent polymer microspheres according to claim 1, characterized in that: The diameter of the fluorescent polymer microsphere (6) is 0.2-0.6 um.

11. The method for preparing a reflective film containing fluorescent polymer microspheres according to claim 1, characterized in that: The method comprises the following preparation steps: (a) taking a fluorescent substance (7) and a high refractive index resin in a mass ratio of 2:8 to 6:4 to form a fluorescent resin containing the fluorescent substance (7), then injecting the fluorescent resin containing the fluorescent substance (7) into the A channel of the dual-channel microfluidic injection pump through the A port provided on the dual-channel microfluidic injection pump, taking methyl silicone oil and injecting the methyl silicone oil into the B channel of the dual-channel microfluidic injection pump through the B port provided on the dual-channel microfluidic injection pump, wherein the propulsion speed ratio between the A channel and the B channel is 1:7 to 1:10, the fluorescent resin containing the fluorescent substance (7) and the methyl silicone oil converge into droplets through the outlet provided on the dual-channel microfluidic injection pump, and the droplets are cured by ultraviolet light to form fluorescent polymerized microspheres (6) containing the fluorescent substance (7), then filtering and washing the fluorescent polymerized microspheres (6) containing the fluorescent substance (7) to remove the methyl silicone oil remaining on the surface of the fluorescent polymerized microspheres (6) containing the fluorescent substance (7); (b) mixing the fluorescent polymer microspheres (6) containing the fluorescent substance (7) and the low refractive index resin in a mass ratio of 3:7 to 5:5 to form a fluorescent resin containing the fluorescent polymer microspheres (6); (c) A substrate layer (3) is taken, and a reflective layer (2) is formed on the lower surface of the substrate layer (3) by vacuum evaporation, wherein the vacuum pressure is 5×10 -1 pa~7×10 -1 pa, and then performing corona treatment on the side of the reflective layer (2) that is not in contact with the substrate layer (3); (d) coating the fluorescent resin containing fluorescent polymer microspheres (6) on the upper surface of the substrate layer (3) through a microstructure roller provided in a coating machine to form a fluorescent microstructure layer (4) containing fluorescent polymer microspheres (6) distributed with fine cubic pyramids (41), wherein the line speed of the coating machine is 5-10 m / min; (e) vapor-depositing a layer of silicon oxide on the upper surface of the fluorescent microstructure layer (4) containing fluorescent polymer microspheres (6) to form a barrier layer (5); (f) coating an adhesive on the lower surface of the reflective layer (2) to form an adhesive layer (1), thereby finally obtaining a reflective film containing fluorescent polymer microspheres.

12. The method for preparing a reflective film containing fluorescent polymer microspheres according to claim 11, characterized in that: The refractive index of the high refractive index resin in step (a) is 1.61-1.68, and the refractive index of the low refractive index resin in step (b) is 1.34-1.41.

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