CN106908887B - High-brightness coating type reflecting film - Google Patents

High-brightness coating type reflecting film Download PDF

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CN106908887B
CN106908887B CN201710195864.7A CN201710195864A CN106908887B CN 106908887 B CN106908887 B CN 106908887B CN 201710195864 A CN201710195864 A CN 201710195864A CN 106908887 B CN106908887 B CN 106908887B
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coating
spherical particles
brightness
resin
reflective film
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CN106908887A (en
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金亚东
刘彬
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Ningbo Solartron Technology Co Ltd
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Ningbo Solartron Technology Co Ltd
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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
    • G02B5/126—Reflex reflectors including curved refracting surface
    • G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors

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  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The present invention relates to optical films, and more particularly, to a high-brightness coating type reflective film. In order to improve the brightness of the display, the invention provides a coating type reflecting film. The reflective film comprises a substrate layer and a coating layer; the coating layer comprises spherical particles with uniform particle size and resin, and the spherical particles are bonded on the surface of the substrate layer through the resin. In the preparation process, raw materials of the coating layer are firstly prepared into a coating liquid, and the coating liquid comprises the following components: 18-30% of resin, 59-77% of diluent, 1-8% of spherical particles and 1-3% of curing agent, wherein the percentage is weight percentage. After the coating type reflecting film is applied to a backlight module of a display, the brightness of the display is obviously improved.

Description

High-brightness coating type reflecting film
Technical Field
The present invention relates to optical films, and more particularly, to a high-brightness coating type reflective film.
Background
The liquid crystal display (L CD) is a widely used display technology, and is popular among people because of its low energy consumption and high image quality, and the backlight module in the liquid crystal display is used as an important component to provide light source for the liquid crystal display.
At present, the market demands for L CD brightness are higher and higher, and the demand for improving the brightness of the backlight module is higher and higher, in the backlight module, the main function of the reflective film is to efficiently and uniformly reflect the light leaking out of the bottom of the light guide plate, thereby reducing the light loss and improving the brightness of the display.
Disclosure of Invention
In order to improve the brightness of the display, the invention provides a coating type reflecting film. After the coating type reflecting film is applied to a backlight module of a display, the brightness of the display is obviously improved.
In order to solve the above problems, the present invention adopts the following technical solutions.
The invention provides a high-brightness coating type reflecting film, which comprises a base material layer and a coating layer; the coating layer comprises spherical particles with uniform particle size and resin, and the spherical particles are bonded on the surface of the substrate layer through the resin.
The reflecting film is coated with a layer of spherical particles with uniform particle size, and multiple reflections are generated when the light source passes through the coating surface, so that the aim of increasing the brightness of the display is fulfilled. Spherical particles of uniform particle size are spherical particles of a single particle size.
Further, in the high-brightness coating type reflective film, the spherical particles are selected from the group consisting of Polymethylmethacrylate (PMMA) particles, Polystyrene (PS) particles, Polybutylmethacrylate (PBMA) particles.
Further, in the high-brightness coating type reflecting film, the particle diameter of the spherical particles is 5 to 20 μm.
Further, the particle diameter of the spherical particles is 10-15 μm.
Further, in the high brightness coating type reflection film, the resin is selected from one of solvent type heat-curing acrylic resin or solvent type heat-curing polyester resin or the combination of at least two of the above.
Further, in the high-brightness coated reflective film, in the preparation process, the raw material of the coating layer is firstly prepared into a coating liquid, and the coating liquid comprises: 18-30% of resin, 59-77% of diluent, 1-8% of spherical particles and 1-3% of curing agent, wherein the percentage is weight percentage.
Further, in the high brightness coated reflective film, the diluent is selected from one or a mixture of at least two of ethyl acetate, butyl acetate, butanone, or toluene.
Further, the diluent is a combination of ethyl acetate and butyl acetate, wherein each of ethyl acetate and butyl acetate is in half proportion (50 wt%).
Further, in the high-brightness coating type reflective film, the spherical particles are selected from Polybutylmethacrylate (PBMA) particles.
Further, the curing agent is selected from isocyanate curing agents.
Further, in the high-brightness coating type reflecting film, the curing agent is thermosetting isocyanate.
Further, in the high-brightness coating type reflective film, the coating liquid includes: 18-22% of solvent type thermosetting polyester resin, 73-75% of diluent, 3-5% of spherical particles and 2% of thermosetting isocyanate. The foregoing technical solutions include example 12, examples 18 to 19.
The invention also provides a preparation method of the high-brightness coating type reflecting film, which comprises the following steps:
(1) preparing a coating liquid from the raw materials of the coating layer, mixing the spherical particles with a diluent, stirring at a high speed for 0.5-1h, adding resin, mixing, stirring at a high speed for 0.5-1h, adding a curing agent, and stirring at a high speed for 10-20min to obtain the coating liquid;
(2) the coating liquid is coated on the surface of the base material, and the coating layer is formed after the coating liquid is solidified.
Compared with the common reflecting film, the coating type reflecting film provided by the invention can be used for increasing the brightness of a display.
Compared with the existing reflecting film, the coating type reflecting film provided by the invention is applied to the backlight module of the display, and the brightness of the display is obviously improved.
Drawings
FIG. 1 is a schematic diagram of a light path of a light reflected by a conventional reflective film;
FIG. 2 is a schematic structural diagram of a reflective film provided in the present invention;
fig. 3 is a schematic diagram of a light path of light reflected by the reflective film provided by the present invention.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and the attached drawings.
As shown in fig. 2, the present invention provides a high-brightness coating type reflective film, which includes a substrate layer 1 and a coating layer 2; the coating layer 2 includes spherical particles 3 of uniform particle diameter and a resin 4. The spherical particles 3 are bonded to the surface of the base material layer by a resin 4.
As shown in fig. 3, the surface of the reflective film provided by the present invention is coated with a layer of spherical particles with uniform particle size, and when the light source passes through the surface of the reflective film, multiple reflections are generated, thereby reducing the light source loss, increasing the utilization rate of the light source, achieving the purpose of increasing the brightness, and further increasing the brightness of the display.
The method for testing the main performance of the reflecting film provided by the invention is briefly described as follows:
the brightness (namely the luminance) test method comprises the steps of assembling the reflecting film into the backlight module, dividing the light emitting surface of the backlight module into 25 regions of 5 × 5, lighting the backlight module, measuring by using a Fushida BM-7A luminance meter, measuring the angle to be 1 DEG, measuring the distance between the luminance meter and the single-side light emitting surface of the backlight source to be 50cm, measuring the luminance of 25 points in the single-side light emitting surface of the backlight module, and obtaining the arithmetic average value of the luminance of the 25 points as the brightness of the reflecting film.
Percent brightness: the percentage of the average luminance of the reflective film obtained in the examples relative to the average luminance of the substrate was calculated as a luminance percentage based on the average luminance of the substrate layer of the reflective film (100%).
Scratch resistance: the reflecting film is placed on a light guide plate applied to a backlight module, the coated particle surface contacts the light guide plate, a weight with a certain weight is placed on the reflecting film, the reflecting film is dragged to move on the light guide plate in a unidirectional uniform speed at the speed of 2cm/s, the light guide plate moves by 20cm, and whether the surface of the light guide plate on the moving path of the reflecting film is scratched or not is observed by naked eyes. And if no scratch exists, increasing the weight of the weight, and repeating the test until the scratch appears or the weight upper limit of the weight is exceeded. The larger the weight, the more excellent the scratch resistance.
In the examples mentioned in the present invention, the solvent type heat-curable acrylic resin, the solvent type heat-curable polyester resin, the spherical particles, and the heat-curable isocyanate were purchased from the company DIC, Japan, and Japan, respectively. The reflective film substrate is purchased from Changyang technologies, Inc., China, DJX188 type reflective film. The diluents are all conventional chemical agents.
Example 1
The invention provides a high-brightness coating type reflecting film, which comprises a base material layer and a coating layer; the coating layer includes spherical particles of uniform particle size. The spherical particles are bonded to the surface of the base material layer by resin. In the preparation process, the raw materials of the coating layer are firstly prepared into a coating liquid, and the formula of the coating liquid is shown as the following table:
raw material The weight percentage content
Diluent (butanone and toluene) 77% (butanone and toluene respectively account for 38.5%)
Solvent-based thermosetting acrylic resin 20％
Spherical Particles (PS) 1% (particle size 5 μm)
Thermally curing isocyanates 2％
The reflecting film provided by the invention is prepared by adopting the following method:
firstly, 1% of spherical particles and 77% of diluent are mixed, the particle size of the spherical particles is 5 microns, butanone and toluene in the diluent respectively account for 38.5%, the mixture is stirred at a high speed for 0.5-1h, then 20% of resin is added and mixed, the mixture is stirred at a high speed for 0.5-1h, then 2% of curing agent is added, and the mixture is stirred at a high speed for 10-20min to prepare the coating liquid. And coating the coating liquid on a substrate layer, and curing to obtain the reflecting film.
Example 2
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
raw material The weight percentage content
Diluent (butanone and toluene) 77% (methyl ethyl ketone and toluene respectively account for 38.5%)
Solvent-based thermosetting polyester resin 20％
Spherical Particles (PBMA) 1% (particle size 5 μm)
Thermally curing isocyanates 2％
Example 3
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000041
example 4
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000042
example 5
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000051
example 6
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000052
example 7
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000053
example 8
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000054
Figure BDA0001257324080000061
example 9
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000062
example 10
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000063
example 11
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000064
example 12
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000071
example 13
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000072
example 14
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000073
example 15
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000074
Figure BDA0001257324080000081
example 16
The reflective film as provided in example 1, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000082
example 17
The reflective film as provided in example 16, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000083
example 18
The reflective film as provided in example 12, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000084
example 19
The reflective film as provided in example 12, wherein the coating fluid formulation is as follows:
Figure BDA0001257324080000091
TABLE 1 data of measured properties of high-brightness coated reflective films and reflective film substrate layers prepared in examples of the present invention
Figure BDA0001257324080000092
Figure BDA0001257324080000101
The test data in table 1 above were analyzed and the uncoated reflective substrate (i.e., substrate layer) was used as a control sample, and the samples in the examples were all coated with spherical particles of a single particle size and had a significant increase in average brightness. Meanwhile, the scratch resistance is obviously improved. Among them, the reflective films provided in examples 12 and 18 to 19 are superior in overall performance.
In particular, the effect of improving the brightness of the display is the best when 4% of spherical particles with the particle size of 15 μm are added, and the coating liquid is prepared by using a solvent-based thermosetting polyester resin and coated on the substrate layer of the reflective film, so that the reflective film provided by the embodiment 12 of the present invention has the highest brightness.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. All equivalent changes and modifications made according to the disclosure of the present invention are covered by the scope of the claims of the present invention.

Claims (2)

1. A high-brightness coating type reflecting film is characterized in that the reflecting film comprises a substrate layer and a coating layer; the coating layer comprises spherical particles with uniform particle size and resin, and the spherical particles are bonded on the surface of the substrate layer through the resin;
in the preparation process, raw materials of the coating layer are firstly prepared into a coating liquid, and the coating liquid comprises the following components: 20% of solvent type thermosetting polyester resin, 74% of diluent, 4% of spherical particles and 2% of thermosetting isocyanate; the diluent comprises 37% of ethyl acetate and 37% of butyl acetate; the particle size of the spherical particles is 15 mu m; the spherical particles are selected from Polybutylmethacrylate (PBMA) particles.
2. A method for preparing a high-brightness coated reflective film according to claim 1, comprising the steps of:
(1) preparing a coating liquid from the raw materials of the coating layer, mixing the spherical particles with a diluent, stirring at a high speed for 0.5-1h, adding resin, mixing, stirring at a high speed for 0.5-1h, adding a curing agent, and stirring at a high speed for 10-20min to obtain the coating liquid;
(2) the coating liquid is coated on the surface of the base material, and the coating layer is formed after the coating liquid is solidified.
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CN101484746B (en) * 2006-06-23 2013-06-12 东丽株式会社 White reflection film
CN103389530A (en) * 2012-08-22 2013-11-13 宁波东旭成化学有限公司 Reflecting film
CN103412355A (en) * 2013-08-19 2013-11-27 宁波激智科技股份有限公司 Diffusion membrane capable of improving viewing angle
CN203745768U (en) * 2013-09-24 2014-07-30 南京兰埔成新材料有限公司 PET diffuse type white reflecting film

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JPH07101261B2 (en) * 1992-03-27 1995-11-01 株式会社明拓システム Diffuse reflection means for edge light panel and manufacturing method thereof
JPH11160508A (en) * 1997-11-28 1999-06-18 Asahi Glass Co Ltd Translucent reflector, reflector and application device
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Publication number Priority date Publication date Assignee Title
CN101484746B (en) * 2006-06-23 2013-06-12 东丽株式会社 White reflection film
CN101542325A (en) * 2007-05-08 2009-09-23 东丽株式会社 White reflective film
CN103389530A (en) * 2012-08-22 2013-11-13 宁波东旭成化学有限公司 Reflecting film
CN103412355A (en) * 2013-08-19 2013-11-27 宁波激智科技股份有限公司 Diffusion membrane capable of improving viewing angle
CN203745768U (en) * 2013-09-24 2014-07-30 南京兰埔成新材料有限公司 PET diffuse type white reflecting film

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Application publication date: 20170630

Assignee: Ningbo Changlong New Material Co.,Ltd.

Assignor: NINGBO SOLARTRON TECHNOLOGY Co.,Ltd.

Contract record no.: X2021330000199

Denomination of invention: A high brightness coated reflective film

Granted publication date: 20200731

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Record date: 20210831