CN112724567B - Heat-resistant light diffusion plate and preparation method thereof - Google Patents
Heat-resistant light diffusion plate and preparation method thereof Download PDFInfo
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- CN112724567B CN112724567B CN202011518650.7A CN202011518650A CN112724567B CN 112724567 B CN112724567 B CN 112724567B CN 202011518650 A CN202011518650 A CN 202011518650A CN 112724567 B CN112724567 B CN 112724567B
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- G—PHYSICS
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- G02B5/00—Optical elements other than lenses
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Abstract
The invention relates to a heat-resistant light diffusion plate and a preparation method thereof, wherein the light diffusion plate comprises the following components in percentage by mass: 80-95 parts of polymethyl methacrylate; 5-20 parts of a light diffusion agent; the light diffusing agent is a nano phase change microcapsule which has a core-shell structure, wherein the core material is a phase change material, the shell material is an inorganic material or an organic-inorganic composite material, and the phase change temperature of the phase change material is 15-50 ℃. The invention and the preparation method thereof can solve the problems of yellowing, darkening, deformation and service life reduction caused by long-time use of the diffusion plate in the current market.
Description
Technical Field
The invention relates to the field of optics, in particular to a heat-resistant light diffusion plate and a preparation method thereof.
Background
The light diffusion plate in the Led lighting fixture utilizes the physical phenomena of refraction, reflection and scattering when light encounters two media with different refractive indexes (densities) in the process of traveling by chemical or physical means, and changes the traveling route of the light by adding an inorganic or organic light diffusion agent to the base material of PMMA, PC, PS, PP, hips and the like or by artificially adjusting the light through the array arrangement of micro-feature structures on the surface of the base material to refract, reflect and scatter the light in different directions, thereby realizing the effect of optical diffusion by filling and dispersing color of the incident light.
However, in the use process of Led lamps (such as the use habit of household lamps), the Led lamps are based on power, the heat dissipation device and the ambient temperature are operated in a temperature range of approximately 50-80 degrees centigrade, the temperature of the corresponding diffusion plate is generally operated in a temperature range of 30-50 degrees, and since the light diffusion plate is generally made of high polymer materials, when the light diffusion plate is continuously or discontinuously operated at a higher temperature for a long time, the light diffusion plate is prone to yellowing and darkening, so that the light transmission effect and the appearance effect of the light diffusion plate are affected, and the service life of the light diffusion plate is seriously affected. In addition, especially in cold regions, when the LED lamp is just turned off, the temperature difference between the diffusion plate and the external temperature is large, so that the temperature stress of the light diffusion plate material is easily caused by the sudden drop of the lamp temperature, and the warping deformation phenomenon occurs, thereby reducing the service life.
The prior art often solves the problems by arranging a high-temperature layer or adopting a heat-resistant material. For example, CN210072120U is a method for preparing a highly heat-resistant light diffusion plate, which comprises a diffusion base layer uniformly mixed with a high molecular optical modification material, a first heat-resistant layer disposed on the upper and lower surfaces of the diffusion base layer, and a second heat-resistant layer disposed in the diffusion base layer, and thus, this patent improves the heat resistance of the light diffusion plate by disposing the heat-resistant layers, but obviously increases the thickness and the complexity of the structural process of the light diffusion plate by disposing the heat-resistant layers on the diffusion plate; CN111019336A relates to a polycarbonate composition with light diffusion performance, wherein cage type polysilsesquioxane is grafted on the surface of an organic silicon resin microsphere through a mercapto-alkene click chemical reaction to obtain a light diffuser, 100 parts of polycarbonate is added with 0.1-1 part of the light diffuser for processing according to the parts by weight to obtain the polycarbonate composition with better haze and light transmission, and meanwhile, the heat resistance and the processability of the polycarbonate are improved, so that the polycarbonate composition can be applied to a lampshade or an LED (light-emitting diode), and therefore, the technology is used for improving the heat resistance of the light diffuser by modifying the heat resistance of the polycarbonate, but the technology can cause the process to be complicated and the cost to be increased; CN211086726U is a heat-resistant diffuser plate, which is structurally provided with a heat-dissipating plate and a heat-resistant layer to increase the heat resistance of the diffuser plate, thereby increasing the service life of the light diffuser plate, however, this technique greatly increases the thickness and complexity of the diffuser plate.
The present invention is to improve heat resistance from the idea different from the prior invention, and more particularly, to improve heat resistance of a light diffusion plate by reducing the maximum temperature during operation of the light diffusion plate in a short time (e.g., in a household) and by relaxing the temperature reduction curve of the light diffusion plate.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a heat-resistant light diffusion plate and a method for manufacturing the same, so as to solve the problems of yellowing, darkening, deformation and reduced service life of the household lamp shade in the market due to long-term use.
The invention provides a heat-resistant light diffusion plate, which comprises a light diffusion polymer base material and a light diffusion agent, and is characterized in that the light diffusion agent comprises a nano phase change microcapsule, the nano phase change microcapsule is provided with a core-shell structure, wherein the core material is a phase change material, the shell material is an inorganic material or an organic-inorganic composite material, and the phase change temperature of the phase change material is 15-50 ℃.
Further, the nano phase change microcapsule has a plurality of different phase change temperatures.
Further, the ratio of the photodiffusion polymer base material to the photodiffusion agent is 80-95: 5-20, more preferably 80-95: 5 to 20.
Further, the light diffusion polymer substrate is polymethyl methacrylate (PMMA), PC, PS or PP.
Further, the nano phase change microcapsule material is commercially available, and preferably, the phase change material is one or more of aliphatic hydrocarbons, alkanes, fatty acids, alcohols, and polyenols, and more preferably, one or more of n-tetradecane, n-octadecane, n-nonadecane, n-eicosane, n-heneicosane, n-docosane, paraffin, Pentaerythritol (PE), trimethylolethane (PG), neopentyl glycol (NPG), 2-amino-2-methyl-1, 3-propanediol (AMP), Tris (TAM), octadecanoic acid (SA), hexadecanoic acid (PA), tetradecanoic acid (MA), dodecanoic acid (LA), and Polymethylmethacrylate (PMMA).
Further, the nano phase change microcapsule shell material is one or more of silicon dioxide, calcium carbonate, polyvinyl chloride, polystyrene, polymethyl methacrylate (PMMA), PC, PS or PP.
Further, the light diffusing agent also comprises one or more of nano barium sulfate, calcium carbonate, silicon dioxide, acrylic type, styrene type and acrylic resin type.
A second aspect of the present invention provides a method for manufacturing a heat-resistant light diffuser plate as set forth in claim 1, comprising the steps of: mixing polymethyl methacrylate, the nano phase change microcapsule, sodium stearate, glycerol and an antioxidant, and uniformly stirring at normal temperature to obtain a mixture; and placing the mixture into a double-roller open mill, mixing at 150-200 ℃ for 10-20 min, and cooling at normal temperature to obtain the heat-resistant light diffusion plate.
Further, the preparation of the heat-resistant light diffusion plate comprises the following steps:
s1, pre-polymerizing the photodiffusion polymer substrate in a reaction kettle for 10-40 min, and cooling for later use;
s2, adding the light diffusant nano phase change microcapsule material and the initiator into the prepolymer, stirring and dissolving, uniformly mixing, adding into a mold, reacting in a water bath at 50-80 ℃ for 2-4 h, taking out, baking at high temperature for 2-4 h, demolding, and diffusing the light.
Due to the technical scheme, the embodiment of the invention has the following beneficial effects:
(1) when the LED lamp is operated discontinuously (like household), especially, the single-time operation is short, the LED lamp can be restrained at the phase-change temperature due to the heat absorption and energy storage phenomena of the phase-change material at the phase-change temperature point, and compared with a lampshade without the phase-change material, the temperature born by the lampshade is low, so that the phenomena of yellowing and darkening of the light diffusion plate are reduced to a certain extent.
(2) In cold areas, after the LED lamp cuts off the power supply, there is great difference in temperature between lamp shade and the environment, nevertheless because phase change material in the nanometer phase change microcapsule gives off heat the phenomenon under specific temperature, the lamp shade cooling that can make tends to alleviate, especially adopts the phase change material in the different phase change temperature scopes, and the effect is more showing to lamp shade macromolecular material that has overcome to lead to because of the difference in temperature is great is rotten to be out of shape, has improved the life of lamp shade.
(3) The nanometer phase change microcapsule is in nanometer scale and can play a role of a light diffusant, so that the light diffusant is integrated with a heat resistance function, an additive for additionally modifying the heat resistance performance or an additional heat-resistant layer is not needed, and the structure is simplified and the cost is reduced on the premise of not influencing the light diffusion effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a temperature rise curve of the surface of a light diffusion plate according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The technical solutions in the examples and comparative examples of the present invention will be clearly and completely described below. The materials and equipment used in the following examples and comparative examples are all conventional products commercially available.
Preparation of the light diffusion plate:
(1) raw materials:
polymer base material: monomer MMA, initiator azobisisobutyronitrile AIBN.
Nano phase change microcapsules: microspherical, the average grain diameter is 50nm-100nm, 100-500nm and 500nm-5 μm, the shell material is silicon dioxide, and the phase change materials are n-octadecane (the phase change temperature is about 28 ℃), n-eicosane (the phase change temperature is about 36 ℃) and n-docosane (the phase change temperature is about 40 ℃).
Light diffusing agent: silica, having an average particle size of about 1 μm, is commercially available.
(2) The preparation method comprises the following steps:
the preparation method of the PMMA light diffusion plate comprises the steps of prepolymerizing monomer MMA in a reaction kettle at 90 ℃ for 10-40 min, and cooling for later use; adding the light diffusion agent and an initiator azobisisobutyronitrile AIBN into the prepolymer, stirring and dissolving, uniformly mixing, adding into a mold, reacting in a water bath at 65 ℃ for 4h, taking out, baking at 8-DEG C for 4h, and demolding to obtain the PMMA light diffusion plate.
The raw material formula can be adjusted according to the following weight percentages to obtain different examples in the following table:
| component (percentage by weight) | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example |
| MMA | 92％ | 92％ | 92％ | 92％ | 92％ |
| SiO2N- |
8％ | 0 | 0 | 2％ | 0 |
| SiO2N- |
0 | 8％ | 0 | 2％ | 0 |
| SiO2N- |
0 | 0 | 8％ | 3％ | 0 |
| |
0 | 0 | 0 | 0 | 8％ |
(3) Performance testing
Light transmittance test and haze test
The light transmittance and light diffusion properties of the light diffusion plates obtained in examples 1 to 4 and comparative examples were measured using a light transmittance haze meter (manufactured by Shanghai precision scientific instruments Co., Ltd.) according to American society for testing and materials Standard ASTM D1003-61(1997) with a test specimen having a thickness of 2 m. The test results are shown in the following table.
Test of plate surface temperature rise curve
Under a 100W Led lamp heat source, a light diffusion plate is placed 8cm away from the front surface of the light diffusion plate, the temperature at the shortest distance between the heat source and the plate surface is measured every 0.5-1h, and the measurement starting point starts from the opening of an Led lamp source, which is shown in the following table:
the temperature rise curve of the surface of the light diffusion plate is shown in figure 1, and as can be seen from figure 1 and the analysis of the table data, the light transmittance and the haze performance are not greatly influenced by adopting the phase-change microcapsules to replace the traditional silica light diffusion agent.
However, under a 100w Led light source, the light is turned on within 1.5-4h (which is consistent with the service time of a common household lamp), and due to the heat absorption phenomenon of the phase change energy storage material at the phase change temperature point, the overall temperature of the light diffusion plate is lower than that of a traditional diffusion plate, and under the service time, the overall temperature is reduced, and the service life of Led and the like can be obviously prolonged.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A heat-resistant light diffusion plate comprises a light diffusion polymer base material and a light diffusion agent, and is characterized in that the light diffusion agent comprises a nano phase change microcapsule, the nano phase change microcapsule has a core-shell structure, wherein the core material is a phase change material, the shell material is an inorganic material, and the phase change temperature of the phase change material is 15-50 ℃;
the ratio of the photodiffusion polymer base material to the photodiffusion agent is as follows:
85-92 parts of a photodiffusion polymer base material;
8-15 parts of light diffusant;
the average particle size of the nano phase change microcapsule is 50nm-100nm, 100-500nm or 500nm-5 mu m;
the phase change material is one or more of n-tetradecane, n-octadecane, n-eicosane, n-heneicosane, n-docosane, paraffin, pentaerythritol, trimethylolethane, neopentyl glycol, 2-amino-2-methyl-1, 3-propanediol, trimethylolaminomethane, octadecanoic acid, hexadecanoic acid, tetradecanoic acid and dodecanoic acid;
the inorganic material is one or more of silicon dioxide and calcium carbonate.
2. The heat resistant light diffuser plate of claim 1 wherein said nano phase change microcapsule material has a plurality of different phase transition temperatures.
3. The heat-resistant light diffuser plate according to claim 1, wherein the light diffusing polymer base material is polymethyl methacrylate, PC, PS or PP.
4. The heat-resistant light diffuser plate of claim 1 wherein said light diffuser further comprises one or more of nano barium sulfate, calcium carbonate, silica, styrene type and acrylic type.
5. A method for manufacturing a heat-resistant light diffuser plate as claimed in claim 1, comprising the steps of:
pre-polymerizing the photodiffusion polymer substrate in a reaction kettle for 10-40 min, and cooling for later use;
adding the light diffuser nano phase change microcapsule material and an initiator into the prepolymer, stirring and dissolving, uniformly mixing, adding into a mold, reacting in a water bath at 50-80 ℃ for 2-4 h, taking out, baking at 80-100 ℃ for 2-4 h, demolding, and diffusing the light.
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Denomination of invention: Heat resistant light diffusion plate and its preparation method Effective date of registration: 20220607 Granted publication date: 20210831 Pledgee: Industrial and Commercial Bank of China Limited Changzhou Economic Development Zone sub branch Pledgor: Changzhou shunweier Material Technology Co.,Ltd. Registration number: Y2022980007212 |