CN110927847A - Reflective film and method for producing same - Google Patents
Reflective film and method for producing same Download PDFInfo
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- CN110927847A CN110927847A CN201911334069.7A CN201911334069A CN110927847A CN 110927847 A CN110927847 A CN 110927847A CN 201911334069 A CN201911334069 A CN 201911334069A CN 110927847 A CN110927847 A CN 110927847A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
Abstract
The invention relates to a reflective film, which comprises a substrate and a reflective layer on the surface of the substrate, wherein the reflective layer comprises a matrix and reflective particles dispersed in the matrix, the reflective particles are polyhedrons comprising n surfaces, any two adjacent surfaces of the n surfaces are defined as an A surface and a B surface, and an included angle between the A surface and the B surface is α, wherein 0 DEG & lt α & lt 180 DEG, 10 & lt n & lt 10 & gt10. The invention also provides a preparation method of the reflecting film.
Description
Technical Field
The invention relates to the field of film materials, in particular to a reflecting film and a preparation method thereof.
Background
At present, the light source used in the illumination and display field is generally an LED light source, which can be a direct type LED light source matched with a diffusion plate or a side type LED light source of a light guide plate. The OLED is used as a core technology of future flexible display, and due to the problems of yield, service life and the like, the time is still needed for comprehensively replacing the traditional backlight module. Conventional backlight modules are still in continuous use in the future.
As an important optical element in a conventional backlight module, market demand for a reflective film is gradually diversified. Among them, the requirements for the properties of the reflective film such as glossiness, scratch resistance, and top-white resistance have been becoming more and more common. Coating reflective films is a common method of making reflective films. In order to satisfy scratch resistance, top white resistance, and the like, particles of various materials are used. However, the scratch resistance, the top white resistance and the light uniformity of the reflective film are difficult to be combined, and thus the reflective film cannot be applied to both direct-type and side-type backlight modules. For example, the coated reflective film has poor light uniformity in the direct-type backlight module, and cannot effectively remove the aperture near the LED, which greatly affects the display effect of the direct-type backlight module, and the light source needs to be softened by other methods such as adding a diffusion film. Therefore, it is desirable to provide a reflective film with scratch resistance, top white resistance and light uniformity.
Disclosure of Invention
Accordingly, the present invention provides a reflective film with scratch resistance, top white resistance and light uniformity.
A reflective film comprising a substrate and a reflective layer on a surface of the substrate, the reflective layer comprising a matrix and reflective particles dispersed in the matrix, the reflective particles being polyhedrons comprising n surfaces defining two of the n surfaces, which are any adjacent surfaces, being A-plane and B-plane, the A-plane and B-plane having an included angle of α, wherein 0 DEG < α < 180 DEG, 10 < n < 1010。
Compared with the prior art, the reflective film is distributed with specific reflective particles, and the reflective particles are polyhedrons comprising n surfaces, so that the n surfaces can reflect and refract light for multiple times, and the reflective film can be endowed with excellent light uniformity and good scratch resistance and top whiteness under the combined action of the reflective particles.
The invention also provides a preparation method of the reflecting film, which comprises the following steps: providing a substrate; coating a mixed solution including reflective particles on the surface of the substrate; and drying to obtain the reflecting film.
The preparation method is simple to operate and easy to industrialize.
Drawings
FIG. 1 is a schematic view of a structure of reflective particles in a reflective film according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to FIG. 1, the reflective particles are polyhedrons comprising n surfaces, any two adjacent surfaces of the n surfaces are defined as an A surface and a B surface, and an included angle between the A surface and the B surface is α, wherein 0 DEG < α < 180 DEG, 10 < n < 10 DEG10. In other words, the reflective particle having a polyhedral shape includes a plurality of surfaces having a polygonal shape. Preferably, 103＜n＜105。
Based on the consideration of the dodging effect, the included angle α between the surface A and the surface B in the n surfaces preferably satisfies the following condition that the occupied ratio of 0 degrees to α to 30 degrees is 1% -60%, which is equivalent to that the polyhedron reflects or refracts incident light rays for more times.
Defining any one of the n surfaces as a polygon, then, preferably, the maximum edge length d of the polygon is in the range: 20 μm to 130 μm. In this case, a good effect can be obtained in the reflection and refraction of the light. More preferably, the maximum edge length d of the polygon is in the range of: 30-120 μm.
The reflective particles are made of at least one of polymethyl methacrylate (PMMA), poly n-butyl methacrylate (PBMA), polyethylene terephthalate (PET), Polyamide (PA) and Polyurethane (PU). Preferably, the material of the reflective particles is at least one of PET and PA. The preferred reasons are: the material is softer.
The material of the matrix is not limited, and it is required that the matrix is easily formed into a film and can serve as a carrier for the reflective particles. For example, the material of the matrix is at least one of acrylic resin, polyurethane resin, and polyester resin.
The invention also provides a preparation method of the reflecting film, which comprises the following steps:
s1, providing a substrate;
s2, coating a mixed solution containing reflective particles on the surface of the substrate; and
and S3, drying to obtain the reflecting film.
In step S1, the substrate is not limited to be made of plastic, glass, metal, etc.
In step S2, the matrix and the reflective particles are mixed to obtain the mixed solution. The material of the matrix is at least one of acrylic resin, polyurethane resin and polyester resin. The mass ratio of the reflecting particles in the mixed solution is 3-5%.
The method for coating the mixed solution containing the reflective particles on the surface of the substrate comprises the following steps: spin coating, spray coating, and cast coating.
In step S3, the drying method is UV curing or heat curing. The time and temperature of the drying are not limited as long as the mixed solution is stably applied to the surface of the substrate after the coating and drying.
The reflective film and the method for producing the reflective film according to the present invention will be described below with reference to examples.
The reflective film substrate in each of the following examples is PET (DJX 250 manufactured by ningwavelength yang technologies ltd.) only as an example. Of course, other reflective film substrates are possible.
Example 1
Adding PMMA particles into thermosetting acrylic glue, preparing a uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PMMA particles in the coating liquid is 3 percent, the maximum edge length of the PMMA particles is 20 mu m, α<The number of included angles of 30 degrees accounts for 1 percent. Number of surface of PMMA particleIn an amount of about 102And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 2
Adding PMMA particles into UV curing acrylic acid glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PMMA particles in the coating liquid is 5 percent, the maximum edge length of the PMMA particles is 130 mu m, α<The number of 30 DEG included angles is 60%, and the number of PMMA particles on the surface is about 1010And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. Drying the film by an oven to prepare the coating reflecting film. To reflective films including reflective layers.
Example 3
Adding PMMA particles into thermosetting polyurethane glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PMMA particles in the coating liquid is 5 percent, the maximum edge length of the PMMA particles is 60 mu m, α<The number of 30 DEG included angles is 25%, and the number of PMMA particles on the surface is about 103And uniformly coating the coating liquid on the surface of the reflecting film substrate through a mesh roller, and drying the coating liquid through an oven to prepare the coated reflecting film. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 4
Adding PMMA particles into thermosetting polyester glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the particles in the coating liquid is 5 percent, the maximum edge length of the PMMA particles is 70 mu m, α<The number of included angles of 30 degrees accounts for 40 percent. The number of PMMA particle surfaces was about 104And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 5
Adding PBMA particles into thermosetting acrylic glue, preparing a uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PBMA particles in the coating liquid is 5%, and the maximum edge length of the PBMA particles is 40 mu m, α<The number of included angles of 30 degrees accounts for 35 percent. The number of surfaces of the PBMA particles is about102And then the coating liquid is uniformly coated on the surface of the reflecting film substrate through a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 6
Adding PET particles into thermosetting acrylic glue, preparing a uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the particles in the coating liquid is 5%, the maximum edge length of the PET particles is 20 mu m, α<The number of 30 DEG included angles is 1%, and the number of surfaces of the PET particles is about 102And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 7
Adding PA particles into thermosetting acrylic acid glue, preparing a uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PA particles in the coating liquid is 5 percent, the maximum edge length of the PA particles is 130 mu m, α<The number of 30 included angles is 60%, and the number of surfaces of the PA particles is about 1010And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 8
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 70 mu m, α<The number of 30 DEG included angles is 10%, and the number of surfaces of the PET particles is about 104And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 9
Adding PU particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PU particles in the coating liquid is 5 percent, the maximum edge length of the PU particles is 70 mu m, α<The number of angles of 30 ℃ was 40%, and the number of PU particle surfaces was about 104And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller.And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 10
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 40 mu m, α<The number of 30 included angles was 35%, and the number of surfaces of the PET particles was about 102And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 11
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 20 mu m, α<The number of 30 DEG included angles is 1%, and the number of surfaces of the PET particles is about 1010And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 12
Adding PET particles into thermosetting acrylic glue, preparing a uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 130 mu m, α<The number of 30 DEG included angles is 60%, and the number of surfaces of the PET particles is about 1010And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 13
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 60 mu m, α<The number of included angles of 30 degrees is 25%, and the number of surfaces of the PET particles is about 103And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 14
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 20 mu m, α<The number of 30 DEG included angles is 1%, and the number of surfaces of the PET particles is about 1010And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 15
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 20 mu m, α<The number of 30 DEG included angles is 3%, and the number of surfaces of the PET particles is about 102And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 16
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 50 mu m, α<The number of 30 DEG included angles is 3%, and the number of surfaces of the PET particles is about 102And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 17
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 50 mu m, α<The number of included angles of 30 degrees is 25%, and the number of surfaces of the PET particles is about 103And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. Drying the film by an oven to prepare the coating reflecting film. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 18
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 100 mu m, α<The percentage of the included angle of 30 degrees is 36 percent, and the number of the surfaces of the PET particles is about 103And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 19
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 30 mu m, α<The number of included angles of 30 degrees is 5%, and the number of PET particle surfaces is about 105And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 20
Adding PET particles into thermosetting acrylic glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5%, the maximum edge length of the PET particles is 120 mu m, α<The included angle of 30 degrees accounts for 15 percent, and the number of the surfaces of the PET particles is about 103And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Example 21
Adding the PA particles into thermosetting acrylic acid glue, preparing uniform coating liquid by a high-speed dispersion machine, wherein the mass ratio of the PET particles in the coating liquid is 5 percent, the maximum edge length of the PET particles is 70 mu m, α<The ratio of the included angle number of 30 degrees is 10%, and the number of the surfaces of the PET particles is about 104And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
Comparative example 1
Adding PMMA particles with irregular shapes into thermosetting acrylic adhesiveIn water. A uniform coating liquid was prepared by a high-speed disperser, and the mass percentage of PMMA particles in the coating liquid was 5%. The number of PMMA particles on the surface is about 102And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
This comparative example 1 differs from example 1 in that: the shape of the PMMA particles is irregular.
Comparative example 2
Spherical or spheroidal PMMA particles are added to a heat-curable acrylic glue. A uniform coating liquid was prepared by a high-speed disperser, and the mass percentage of PMMA particles in the coating liquid was 5%. The number of PMMA particles on the surface is about 102And (4) respectively. And then the coating liquid is uniformly coated on the surface of the reflecting film substrate by a mesh roller. And drying the film by an oven to obtain the reflecting film comprising the reflecting layer.
This comparative example 2 differs from example 1 in that: the shape of the PMMA particles is spherical or spheroidal.
The reflective films obtained in the above examples and comparative examples were subjected to the following tests.
The anti-adsorption test comprises the steps of assembling a reflecting film sample into an 18.5-inch backlight (side-in type), observing whether the backlight has bright spots after lighting, indicating that the anti-adsorption property of the reflecting film is poor if the bright spots exist, indicating that the anti-adsorption property of the reflecting film is excellent if the bright spots do not exist, ○ indicating that the anti-adsorption property of the reflecting film is excellent, △ indicating that the anti-adsorption property of the reflecting film is general (local white spots exist after assembling), and x indicating that the anti-adsorption property of the reflecting sheet is poor (local white spots exist after assembling), and the results are shown in the table 1.
And (3) a scratch resistance test, namely cutting the reflecting film into 10 multiplied by 10mm, rubbing the printing surface of the mesh points of the PMMA printing light guide plate through an abrasion resistance tester, weighing 1000g, carrying out speed 10 times/min, and after 50 times of reciprocating, observing the abrasion condition of the printing mesh points, wherein ○ shows that the mesh points are not scratched, △ shows that the mesh points are slightly scratched, and multiplied shows that the mesh points are seriously scratched.
TABLE 1
As can be seen from the test results of each example and comparative example 2 in table 1, the reflective layer can improve the scratch resistance and the top white resistance of the reflective film, and simultaneously greatly reduce the surface gloss of the reflective film; the lower the glossiness is, the better the light uniformity of the reflective film in the direct-type backlight source is, and the introduction of the reflective layer of the present application endows the reflective film with excellent light uniformity and simultaneously has good scratch resistance and top white resistance.
It can be seen from comparison between example 15 and example 16 that the longer the maximum edge length of the reflective particles, the better the anti-adsorption property.
The number of the surfaces of the reflective particles of each example was 10 to 10 with respect to the reflective film coated with the random particles of comparative example 1 and the spherical particles of comparative example 210In this range, the gloss is lower, that is, the gloss is more uniform.
In comparative examples 1 to 21, it can be seen that the particles were made of PET or PA, and had maximum edge lengths d in the range of 30 μm to 120 μm and α<The 30 degree ratio is 1% -15%, and the number of the particle surface is 103-105The reflective film within the above range is excellent in the overall properties (gloss, scratch resistance and adsorption resistance). And of these example 8 is the most excellent.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several 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 (10)
1. A reflective film comprising a substrate and a reflective layer on a surface of the substrate, the reflective layer comprising a matrix and reflective particles dispersed in the matrix, the reflective particles being polyhedrons comprising n surfaces defining two of the n surfaces, which are any adjacent surfaces, being A-plane and B-plane, the A-plane and B-plane having an included angle of α, wherein 0 DEG < α < 180 DEG, 10 < n < 1010。
2. The reflective film of claim 1, wherein an included angle α between the a-plane and the B-plane of the n surfaces satisfies the condition 0 ° < α < 30 ° in a proportion of 1% to 60%.
3. The film of claim 1, wherein any one of the n surfaces is defined as a polygon having a maximum edge length d in the range of: 20 μm to 130 μm.
4. The film of claim 3, wherein the maximum edge length d of the polygon is in the range of: 30-120 μm.
5. The reflective film of claim 1, wherein the reflective particles are at least one of polymethyl methacrylate, poly (n-butyl methacrylate), polyethylene terephthalate, polyamide, and polyurethane.
6. The reflective film of claim 1, wherein the material of the matrix is at least one of acrylic resin, polyurethane resin, and polyester resin.
7. A method for producing a reflective film according to any of claims 1 to 6, comprising the steps of:
providing a substrate;
coating a mixed solution including reflective particles on the surface of the substrate; and
and drying to obtain the reflecting film.
8. The method of manufacturing a reflective film according to claim 7, wherein the reflective particles are present in the mixed solution in a mass ratio of 3% to 5%.
9. The method of manufacturing a reflective film according to claim 7, wherein the method of coating the surface of the substrate with the mixed solution including the reflective particles comprises: spin coating, spray coating, and cast coating.
10. The method of manufacturing a reflective film according to claim 7, wherein the drying method is UV curing or heat curing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911334069.7A CN110927847A (en) | 2019-12-23 | 2019-12-23 | Reflective film and method for producing same |
| PCT/CN2019/128191 WO2021128042A1 (en) | 2019-12-23 | 2019-12-25 | Reflective film and preparation method therefor |
| KR1020227010189A KR20220054365A (en) | 2019-12-23 | 2019-12-25 | Reflective film and manufacturing method thereof |
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| CN201911334069.7A CN110927847A (en) | 2019-12-23 | 2019-12-23 | Reflective film and method for producing same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114114755A (en) * | 2021-12-03 | 2022-03-01 | 宁波长阳科技股份有限公司 | Preparation method of reflecting film, reflecting film and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114755A (en) * | 2021-12-03 | 2022-03-01 | 宁波长阳科技股份有限公司 | Preparation method of reflecting film, reflecting film and application thereof |
| CN114114755B (en) * | 2021-12-03 | 2024-04-02 | 宁波长阳科技股份有限公司 | Method for producing a reflective film, reflective film and use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021128042A1 (en) | 2021-07-01 |
| KR20220054365A (en) | 2022-05-02 |
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