CN112764143A - Long-service-life reflective silver film, preparation method thereof and backlight module - Google Patents

Long-service-life reflective silver film, preparation method thereof and backlight module Download PDF

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CN112764143A
CN112764143A CN202110003325.5A CN202110003325A CN112764143A CN 112764143 A CN112764143 A CN 112764143A CN 202110003325 A CN202110003325 A CN 202110003325A CN 112764143 A CN112764143 A CN 112764143A
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carbon
water
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ceramic
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邓建东
吴伟权
薛海星
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Dongguan Light Chi Photoelectric Co ltd
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Dongguan Light Chi Photoelectric Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0808—Mirrors having a single reflecting layer
    • 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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Abstract

The invention provides a reflective silver film with long service life, which comprises an upper PET layer, a first water-resistant layer, a silver layer, a second water-resistant layer and a lower PET layer which are contacted in sequence; the first water resisting layer comprises a ceramic layer A and a carbon functional layer A; the second water resisting layer comprises a ceramic layer B and a carbon functional layer B; the ceramic layer A and the ceramic layer B are respectively and independently one or more selected from silicon oxide, silicon nitride, aluminum oxide and aluminum nitride; the carbon functional layer A and the carbon functional layer B are independently selected from graphene and/or carbon nanotubes. The invention utilizes the loose and imperfect structure of the carbon nano-tubes and the graphene, can store water vapor, can adjust the water vapor to enter and store on the PET water-blocking and air-blocking layer, can prolong the service life of the silver film, and can disperse heat in a local area without concentrating the heat easily in a thin film type. The invention also provides a preparation method of the reflective silver film with long service life and a backlight module.

Description

Long-service-life reflective silver film, preparation method thereof and backlight module
Technical Field
The invention belongs to the technical field of liquid crystal display backlight modules, and particularly relates to a reflective silver film with long service life, a preparation method of the reflective silver film and a backlight module.
Background
The LCD product is an inactive light-emitting electronic device, which does not have a light-emitting characteristic, and the display performance can be obtained only by the emission of the light source in the backlight module, so the brightness of the LCD is determined by the backlight module. Therefore, the backlight quality determines important parameters of the liquid crystal display screen such as brightness, emergent light uniformity, color gradation and the like, and the light emitting effect of the liquid crystal display screen is determined to a great extent.
The backlight module comprises an illumination light source, a reflector plate, a light guide plate, a diffuser plate, a brightness enhancement film (prism sheet), a frame and the like. The backlight module used in the LCD can be mainly classified into a side light type backlight module and a direct light type backlight module. The mobile phone, notebook computer and monitor (15 inches) mainly use the side light type backlight module, and most of the liquid crystal television uses the direct type backlight module light source. The backlight module light source mainly uses a Light Emitting Diode (LED) light source as a backlight source of the LCD.
The existing commercially available reflector plate is formed by bonding two PET films, and is generally formed by bonding a silver-plated reflector plate and a black or white reflector plate or an aluminum-plated film. However, the silver reflective sheet can cause the reflectivity of the silver reflective sheet to be reduced after contacting with water vapor in the environment, and the performance of the backlight module is affected.
Disclosure of Invention
The invention aims to provide a reflective silver film with long service life, a preparation method thereof and a backlight module.
The invention provides a reflective silver film with long service life, which comprises an upper PET layer, a first water-resistant layer, a silver layer, a second water-resistant layer and a lower PET layer which are contacted in sequence;
the first water resisting layer comprises a ceramic layer A and a carbon functional layer A; the second water resisting layer comprises a ceramic layer B and a carbon functional layer B;
the ceramic layer A and the ceramic layer B are respectively and independently one or more selected from silicon oxide, silicon nitride, aluminum oxide and aluminum nitride;
the carbon functional layer A and the carbon functional layer B respectively and independently comprise graphene and/or carbon nanotubes.
Preferably, the ceramic layer A is in contact with the carbon functional layer A; the ceramic layer B is in contact with the carbon functional layer B.
Preferably, the thickness of the ceramic layer A is 50-150 nm, and the thickness of the ceramic layer B is 50-150 nm.
Preferably, the thickness of the carbon functional layer A is 0.5-2.5 μm, and the thickness of the carbon functional layer B is 0.5-2.5 μm.
The invention provides a preparation method of the reflective silver film with long service life, which comprises the following steps:
A) forming a ceramic layer B on the surface of the lower PET layer through magnetron sputtering, coating and curing the carbon material slurry B to form a carbon functional layer B, and obtaining the lower PET layer compounded with a second water-blocking layer, wherein the ceramic layer B and the carbon functional layer B are formed in no sequence;
forming a ceramic layer A on the surface of the upper PET layer through magnetron sputtering, coating and curing the carbon material slurry A to form a carbon functional layer A, and obtaining the upper PET layer compounded with the first water-blocking layer, wherein the ceramic layer A and the carbon functional layer A are formed in no sequence;
B) and evaporating a silver layer on the surface of the second water-resistant layer, and then bonding the silver layer with the first water-resistant layer to obtain the reflective silver film with long service life.
Preferably, the target material of the magnetron sputtering is a silicon target and/or aluminum palladium; the magnetron sputtering uses a mixed gas of argon and oxygen or a mixed gas of argon and nitrogen, and the total gas flow in the magnetron sputtering is 60-120 sccm.
Preferably, the carbon material slurry A is a polyurethane coating liquid of a carbon material, and the mass concentration of the carbon material in the carbon material slurry A is 5-20%;
the carbon material slurry B is a polyurethane coating liquid of a carbon material, and the mass concentration of the carbon material in the carbon material slurry B is 5-20%.
Preferably, the temperature for coating and curing the carbon material slurry A is 100-150 ℃;
the temperature for coating and curing the carbon material slurry B is 100-150 ℃.
Preferably, the power of the silver film evaporation is 500-800 kW.
The invention provides a backlight module, which comprises the reflective silver film with long service life.
The invention provides a reflective silver film with long service life, which comprises an upper PET layer, a first water-resistant layer, a silver layer, a second water-resistant layer and a lower PET layer which are contacted in sequence; the first water resisting layer comprises a ceramic layer A and a carbon functional layer A; the second water resisting layer comprises a ceramic layer B and a carbon functional layer B; the ceramic layer A and the ceramic layer B are respectively and independently one or more selected from silicon oxide, silicon nitride, aluminum oxide and aluminum nitride; the carbon functional layer A and the carbon functional layer B are independently selected from graphene and/or carbon nanotubes. The invention utilizes the loose and imperfect structure of the carbon nano-tubes and the graphene, can store water vapor, can adjust the water vapor to enter and store on the PET water-blocking and air-blocking layer, can prolong the service life of the silver film, and can disperse heat in a local area without concentrating easily in a thin film type; the compact ceramic material can block water vapor, is a transparent ceramic oxide layer, and is not easy to allow external water vapor to penetrate through PET and enter the structure to be oxidized. Test results show that the reflectance of the reflective silver film of the invention is still maintained above 96% when the reflective silver film is operated for 1000 hours under high temperature and high humidity environment (60 ℃, 90% RH).
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view of a reflective silver film according to an embodiment of the present invention;
1 is the upper PET layer, 2 is ceramic layer A, 3 is carbon function layer A, 4 is the ultraviolet curing glue film, 5 is the silver layer, 6 is carbon function layer B, 7 is ceramic layer B, 8 is the lower PET layer.
Detailed Description
The invention provides a reflective silver film with long service life, which comprises an upper PET layer, a first water-resistant layer, a silver layer, a second water-resistant layer and a lower PET layer which are contacted in sequence;
the first water resisting layer comprises a ceramic layer A and a carbon functional layer A; the second water resisting layer comprises a ceramic layer B and a carbon functional layer B;
the ceramic layer A and the ceramic layer B are respectively and independently one or more selected from silicon oxide, silicon nitride, aluminum oxide and aluminum nitride;
the carbon functional layer A and the carbon functional layer B are independently selected from graphene and/or carbon nanotubes.
In the invention, the upper PET layer is preferably a transparent PET film, and the thickness of the upper PET layer is preferably 30-45 μm, more preferably 35-40 μm, and most preferably 38 μm.
In the invention, the first water resisting layer comprises a ceramic layer A and a carbon functional layer A, wherein the ceramic layer A comprises one or more of silicon oxide, silicon nitride, aluminum oxide and aluminum nitride, and SiO is more preferablex，SiNx，AlOxAnd AlNxOne or more of the above; wherein, x is more preferably 1. ltoreq. x.ltoreq.4, and more preferably 2. ltoreq. x.ltoreq.3; the thickness of the ceramic layer A is preferably 50-150 nm, more preferably 70-130 nm, and specifically, the thickness can be 70nm, 150nm, 90nm, 175nm, 50nm or 80 nm.
The carbon functional layer a preferably includes a carbon material, and the carbon material is preferably graphene and/or carbon nanotubes, and particularly, when the carbon functional layer includes graphene and carbon nanotubes, a mass ratio of the graphene to the carbon nanotubes is preferably 1: 1; the graphene is preferably flaky, the diameter of the flaky graphene is preferably 20-50 nm, and the specific surface area is preferably 400-550 m2(ii)/g; the carbon nano tube is preferably a multi-walled carbon nano tube, the pH value is 7.0-8.0, the diameter of the carbon nano tube is preferably 30-60 nm, and the specific surface area is preferably 60-300 m2(ii)/g; the thickness of the carbon functional layer A is preferably 0.5 to 2.5 μm, more preferably 1 to 2 μm, and most preferably 1.2 to 1.3 μm, and specifically, in an embodiment of the present invention, may be 1.2 μm, 1.3 μm, or 2.1 μm.
The graphene and the carbon nano-tube have high specific surface area, can have strong adsorption capacity on water vapor, and carbon materials can preferentially attract the water vapor to adhere to the carbon nano-tube, thereby protecting the silver film.
In the present invention, the ceramic layer a and the carbon functional layer a are preferably in contact, and the stacking order of the ceramic layer a and the carbon functional layer a in the present invention is not particularly limited, and the ceramic layer a may be in contact with the upper PET layer, the carbon functional layer a may be in contact with the silver layer, or the ceramic layer a may be in contact with the silver layer, and the carbon functional layer a may be in contact with the upper PET layer.
In the present invention, the thickness of the silver layer is preferably 100 to 150nm, more preferably 110 to 130nm, and in particular, in an embodiment of the present invention, the thickness may be 110 nm.
In the invention, an ultraviolet curing adhesive layer is further arranged between the silver layer and the first water resisting layer, and the thickness of the ultraviolet curing adhesive layer is preferably 1-8 μm, and more preferably 3-5 μm.
In the invention, the second water resisting layer comprises a ceramic layer B and a carbon functional layer B, wherein the ceramic layer B comprises one or more of silicon oxide, silicon nitride, aluminum oxide and aluminum nitride, and SiO is more preferablex，SiNx，AlOxAnd AlNxOne or more of the above; wherein, x is more preferably 1. ltoreq. x.ltoreq.4, and more preferably 2. ltoreq. x.ltoreq.3; the thickness of the ceramic layer B is preferably 50-150 nm, more preferably 70-130 nm, and specifically, the thickness of the ceramic layer B can be 70nm, 150nm, 90nm, 175nm, 50nm or 80 nm.
The carbon functional layer B preferably includes a carbon material, and the carbon material is preferably graphene and/or carbon nanotubes, and specifically, when the carbon functional layer includes graphene and carbon nanotubes, the mass ratio of the graphene to the carbon nanotubes is preferably 1: 1; the graphene is preferably flaky, the diameter of the flaky graphene is preferably 20-50 nm, and the specific surface area is preferably 400-550 m2(ii)/g; the carbon nano tube is preferably a multi-walled carbon nano tube, the pH value is 7.0-8.0, the diameter of the carbon nano tube is preferably 30-60 nm, and the specific surface area is preferably 60-300 m2(ii)/g; the thickness of the carbon functional layer B is preferably 0.5 to 2.5 μm, more preferably 1 to 2 μm, and most preferably 1.2 to 1.3 μm, and specifically, in an embodiment of the present invention, may be 1.2 μm, 1.3 μm, or 2.1 μm.
In the present invention, the ceramic layer B and the carbon functional layer B are preferably in contact, and the stacking order of the ceramic layer B and the carbon functional layer B in the present invention is not particularly limited, and the ceramic layer B may be in contact with the upper PET layer, the carbon functional layer B may be in contact with the silver layer, or the ceramic layer B may be in contact with the silver layer, and the carbon functional layer B may be in contact with the upper PET layer.
In the present invention, the stacking order of the ceramic layer a and the carbon functional layer a in the first water-resistant layer may be the same as or different from the stacking order of the ceramic layer B and the carbon functional layer B in the second water-resistant layer, and the stacking order of the ceramic layer a and the carbon functional layer a in the first water-resistant layer may be the same as or different from the thickness of the ceramic layer B and the carbon functional layer B in the second water-resistant layer. That is, the specific film layer structures of the first water-blocking layer and the second water-blocking layer on both sides of the silver layer, which is centered on the silver layer, may be arranged in a symmetrical structure or an asymmetrical structure.
In the invention, the lower PET layer is preferably a transparent PET layer, a PET black film or a PET white film, and the thickness of the lower PET layer is preferably 30-45 μm, more preferably 35-40 μm, and most preferably 38 μm.
The invention also provides a preparation method of the reflective silver film with long service life, which comprises the following steps:
A) forming a ceramic layer B on the surface of the lower PET layer through magnetron sputtering, coating and curing the carbon material slurry B to form a carbon functional layer B, and obtaining the lower PET layer compounded with a second water-blocking layer, wherein the ceramic layer B and the carbon functional layer B are formed in no sequence;
forming a ceramic layer A on the surface of the upper PET layer through magnetron sputtering, coating and curing the carbon material slurry A to form a carbon functional layer A, and obtaining the upper PET layer compounded with the first water-blocking layer, wherein the ceramic layer A and the carbon functional layer A are formed in no sequence;
B) and evaporating a silver layer on the surface of the second water-resistant layer, and then bonding the silver layer with the first water-resistant layer to obtain the reflective silver film with long service life.
According to the invention, first water-resistant layers are respectively formed on the surfaces of the upper PET layer and the lower PET layer, a second water-resistant layer is formed on the surface of the lower PET layer, a silver layer is formed on the surface of the second water-resistant layer, and finally, the surface of the silver layer of the lower PET layer with the silver layer is bonded with the second water-resistant layer through an adhesive, so that the reflective silver film with long service life is obtained.
Wherein the step of forming the first water blocking layer comprises forming a ceramic layer A by a magnetron sputtering method and forming a carbon functional layer A by a carbon material slurry coating method; the step of forming the second water blocking layer includes forming a ceramic layer B by a magnetron sputtering method and forming a carbon functional layer B by a carbon material slurry coating method.
The formation of the first water-resistant layer and the formation of the second water-resistant layer are not in sequence, the formation of the ceramic layer B and the formation of the carbon functional layer B are not in sequence, and the formation of the ceramic layer A and the formation of the carbon functional layer A are not in sequence.
Specifically, the present invention takes one of the structures as an example to illustrate a specific preparation process of the reflective silver film in the present invention, that is, takes a reflective silver film having an upper PET layer, a ceramic layer a, a carbon functional layer A, UV glue layer, a silver layer, a carbon functional layer B, a ceramic layer B and a lower PET layer structure in contact in sequence as an example, and the preparation steps of the reflective silver film in the present invention are as follows:
A) forming a ceramic layer B on the surface of a lower PET layer through magnetron sputtering, and then coating carbon material slurry B on the surface of the ceramic layer B to form a carbon functional layer B to obtain a lower PET layer compounded with a second water-blocking layer;
forming a ceramic layer A on the surface of an upper PET layer by magnetron sputtering, and then coating carbon material slurry A on the surface of the ceramic layer A to form a carbon functional layer A, so as to obtain a lower PET layer compounded with a first water-blocking layer;
the preparation of the lower PET layer compounded with the second water-resistant layer and the preparation of the upper PET layer compounded with the first water-resistant layer are not in sequence;
B) and evaporating a silver layer on the surface of the second water-resistant layer, and then bonding the silver layer with the first water-resistant layer to obtain the reflective silver film with long service life.
In the present invention, the magnetron sputtering conditions for forming the ceramic layer B are as follows:
the target material is silicon and/or aluminum, the gas is a mixed gas of argon and oxygen or a mixed gas of argon and nitrogen, when the magnetron sputtering is carried out in an oxygen atmosphere, the total gas flow is preferably 50-100 sccm, more preferably 60-90 sccm, most preferably 70-80 sccm, and the volume ratio of the argon to the oxygen is preferably 1: (0.5 to 2), more preferably 1: (1 to 1.5), and most preferably 1: 1.
when the magnetron sputtering is performed in a nitrogen atmosphere, the total gas flow is preferably 50-100 sccm, more preferably 60-90 sccm, and most preferably 70-90 sccm, and the volume ratio of argon to oxygen is preferably 1: (0.5 to 2), more preferably 1: (1 to 1.5), and most preferably 1: 1.25.
the power of the magnetron sputtering is preferably 1-5 kW/m2More preferably 2 to 4kW/m2Most preferably 3kW/m2DC direct current sputtering is preferably used in the present invention.
The invention preferably uses a roll-to-roll magnetron sputtering coating device to prepare the ceramic layer B, and the thickness of the ceramic layer B can be controlled by controlling the speed of a roll-to-roll machine. The speed of the roll-to-roll machine is preferably 5-20 m/min, and more preferably 8-15 m/min.
In the present invention, the coating conditions for forming the carbon functional layer B are as follows:
and coating the carbon material slurry B on the surface of the ceramic layer B by adopting a gravure coating method, and performing thermosetting to obtain the carbon functional layer B.
The carbon material slurry B comprises a carbon material and polyurethane glue, the carbon material is preferably graphene and/or carbon nano tubes, and the mass fraction of the carbon material in the carbon material slurry is preferably 5-20%, and more preferably 8-15%;
the coating speed is preferably 30-45 m/min, more preferably 35-40 m/min, and most preferably 37 m/min; the heat curing temperature is preferably 100-150 ℃, more preferably 110-140 ℃, most preferably 120-130 ℃, and the heat curing time is preferably 10-30 s, more preferably 15-26 s, most preferably 20-26 s.
Under a certain coating speed, the thickness of the carbon functional layer B can be adjusted by adjusting the solid content of the carbon material slurry, namely the content of the carbon material.
In the present invention, the magnetron sputtering conditions for forming the ceramic layer a are as follows:
the target material is silicon and/or aluminum, the gas is a mixed gas of argon and oxygen or a mixed gas of argon and nitrogen, when the magnetron sputtering is carried out in an oxygen atmosphere, the total gas flow is preferably 50-100 sccm, more preferably 60-90 sccm, most preferably 70-80 sccm, and the volume ratio of the argon to the oxygen is preferably 1: (0.5 to 2), more preferably 1: (1 to 1.5), and most preferably 1: 1.
when the magnetron sputtering is performed in a nitrogen atmosphere, the total gas flow is preferably 50-100 sccm, more preferably 60-90 sccm, and most preferably 70-90 sccm, and the volume ratio of argon to oxygen is preferably 1: (0.5 to 2), more preferably 1: (1 to 1.5), and most preferably 1: 1.25.
the power of the magnetron sputtering is preferably 1-5 kW/m2More preferably 2 to 4kW/m2Most preferably 3kW/m2DC direct current sputtering is preferably used in the present invention.
The ceramic layer A is prepared by preferably using roll-to-roll magnetron sputtering coating equipment, and the thickness of the ceramic layer A can be controlled by controlling the speed of a roll-to-roll machine. The speed of the roll-to-roll machine is preferably 5-20 m/min, and more preferably 8-15 m/min.
In the present invention, the coating conditions for forming the carbon functional layer a are as follows:
and coating the carbon material slurry A on the surface of the ceramic layer B by adopting a gravure coating method, and performing thermosetting to obtain the carbon functional layer A.
The carbon material slurry A comprises a carbon material and polyurethane glue, the carbon material is preferably graphene and/or carbon nano tubes, and the mass fraction of the carbon material in the carbon material slurry is preferably 5-20%, and more preferably 8-15%;
the coating speed is preferably 30-45 m/min, more preferably 35-40 m/min, and most preferably 37 m/min; the heat curing temperature is preferably 100-150 ℃, more preferably 110-140 ℃, most preferably 120-130 ℃, and the heat curing time is preferably 10-30 s, more preferably 15-26 s, most preferably 20-26 s.
Under a certain coating speed, the thickness of the carbon functional layer A can be adjusted by adjusting the solid content of the carbon material slurry A, namely the content of the carbon material. For example, according to the above-mentioned production conditions, the content of the carbon material in the carbon material slurry was 8% in the production of the carbon functional layer having the thickness of 1.2 μm and 1.3 μm, and the content of the carbon material in the carbon material slurry was 15% in the production of the carbon functional layer having the thickness of 2.1 μm.
After the lower PET compounded with the second water-resistant layer is obtained, the invention carries out evaporation on the surface of the second water-resistant layer (namely the surface of the carbon functional layer B) to prepare the silver layer.
In the invention, the evaporation power is preferably 500-800 kW, and more preferably 600-700 kW; the vacuum degree of the evaporation is preferably 0.5-1.0 Pa, and more preferably 0.6-0.8 Pa; the speed of the evaporation is preferably 50-100 m/min, more preferably 60-90 m/min, and most preferably 70-80 m/min.
Finally, the invention uses ultraviolet curing pressure sensitive adhesive (UV-PSA) to bond the silver layer and the carbon functional layer A together, so as to obtain the reflective silver film with long service life.
The invention also provides a backlight module which comprises the reflective silver film with long service life.
The invention provides a reflective silver film with long service life, which comprises an upper PET layer, a first water-resistant layer, a silver layer, a second water-resistant layer and a lower PET layer which are contacted in sequence; the first water resisting layer comprises a ceramic layer A and a carbon functional layer A; the second water resisting layer comprises a ceramic layer B and a carbon functional layer B; the ceramic layer A and the ceramic layer B are respectively and independently one or more selected from silicon oxide, silicon nitride, aluminum oxide and aluminum nitride; the carbon functional layer A and the carbon functional layer B are independently selected from graphene and/or carbon nanotubes. The invention utilizes the loose and imperfect structure of the carbon nano-tubes and the graphene, can store water vapor, can adjust the water vapor to enter and store on the PET water-blocking and air-blocking layer, can prolong the service life of the silver film, and can disperse heat in a local area without concentrating easily in a thin film type; the compact ceramic material can block water vapor, is a transparent ceramic oxide layer, and is not easy to allow external water vapor to penetrate through PET and enter the structure to be oxidized. Test results show that the reflectance of the reflective silver film of the invention is still maintained above 96% when the reflective silver film is operated for 1000 hours under high temperature and high humidity environment (60 ℃, 90% RH).
In order to further illustrate the present invention, the following detailed description will be made on a reflective silver film with a long service life, a method for manufacturing the same, and a backlight module according to the present invention, which should not be construed as limiting the scope of the present invention.
Example 1
Taking a PET transparent film with the thickness of 38 mu m, forming a SiO layer on the surface of the PET transparent film through magnetron sputtering, wherein the target material is a silicon target, the gas is a mixed gas of argon and oxygen, the flow of the argon is 40sccm, the flow of the oxygen is 40sccm, and the sputtering power is 3kW/m2The speed of a reel-to-reel machine is 8m/min, and a SiO layer with the thickness of 130nm is obtained;
mixing graphene with polyurethane glue solution to obtain graphene coating solution with the graphene content of 8%, then carrying out gravure coating on the surface of the SiO layer, and carrying out thermosetting at 120 ℃ to obtain a graphene layer with the thickness of 1.2 mu m;
another 38-micron-thick PET white film is taken, and a 70 nm-thick SiO layer (the speed of a roll-to-roll machine is 15m/min) and a 1.2-micron-thick graphene layer are formed on the surface of the white film according to the method;
a silver layer is evaporated on the graphene layer (PET white film) and the thickness is 110 nm;
and bonding the silver layer and the graphene layer (PET transparent film) by using UV-PSA ultraviolet curing adhesive to obtain the reflective silver film.
Examples 2 to 12
A reflective silver film was prepared as in example 1, except that it was prepared according to the structural parameters in table 1:
TABLE 1 film thickness for examples 1-12
Figure BDA0002882446180000091
Figure BDA0002882446180000101
Wherein, in the preparation of the SiO layer with the thickness of 130nm, the speed of a roll-to-roll machine is 8m/min, and in the preparation of the SiO layer with the thickness of 70nm, the speed of the roll-to-roll machine is 15 m/min.
In the preparation of the carbon functional layer having the thickness of 1.2 μm and 1.3 μm, the content of the carbon material in the carbon material slurry was 8%, and in the preparation of the carbon functional layer having the thickness of 2.1 μm, the content of the carbon material in the carbon material slurry was 15%.
The following tests were carried out on the reflective silver films prepared in examples 1 to 12, and the change in reflectance (550nm) was measured, and the results are shown in table 2.
The test method specifically comprises the following steps: (1) high temperature test (80 ℃/500/1000 h): a high-temperature furnace is adopted to carry out high-temperature storage test for 500/1000 hours at 80 ℃;
(2) high temperature high humidity test (60 ℃/90% RH 500/1000 h): performing high-temperature and high-humidity test by using a high-temperature furnace, and continuously testing for 500/1000 hours at the temperature of 60 ℃ and the relative humidity of 95% RH;
(3) cold and hot impact (100/200 times): the hot and cold impact test oxidation refers to IEC 60068-2-14:2009Na or GB/T2423.22-2012 Na, and the reflector plate is operated once at intervals of 30min between the temperature of-40 ℃ and the temperature of 80 ℃ for 100/200 times of continuous tests.
The test conditions are the in-line specification of the optical film of the LCD backlight module, and refer to GB/T1740-2007 or ISO 4611:2010,
TABLE 2 reflectance of the silver reflective films of examples 1 to 12
Figure BDA0002882446180000111
In Table 2, reflectance is 98% or more, reflectance is 96 to 98% for O, and reflectance is 92 to 96% for Delta.
Examples 13 to 24
A reflective silver film was prepared according to the method in example 1, except that it was prepared according to the structural parameters in table 3:
TABLE 3 film thickness of examples 13-24
Figure BDA0002882446180000112
Figure BDA0002882446180000121
Wherein, in the preparation of the AlO layer with the thickness of 175nm, the speed of a roll-to-roll machine is 8m/min, and in the preparation of the AlO layer with the thickness of 90nm, the speed of the roll-to-roll machine is 15 m/min.
The reflective silver films prepared in examples 13 to 24 were subjected to a high temperature test, a high temperature and high humidity test, and a cold thermal shock test in the above-described manner, and the change in reflectance (550nm) was measured, and the results are shown in table 4.
TABLE 4 reflectance of the silver reflective films of examples 13 to 24
Figure BDA0002882446180000122
In Table 4, reflectance is not less than 98%, reflectance is 96 to 98%, and reflectance is 92 to 96%.
Examples 25 to 36
A reflective silver film was prepared according to the method in example 1, except that it was prepared according to the structural parameters in table 5:
TABLE 5 film thickness of examples 25-36
Figure BDA0002882446180000123
Figure BDA0002882446180000131
In the preparation of the SiN layer, the magnetron sputtering atmosphere is argon and nitrogen, the argon flow is 40sccm, and the nitrogen flow is 50 sccm. In the preparation of an 80nm thick SiN layer, the reel-to-reel speed was 8m/min, and in the preparation of a 50nm thick SiN layer, the reel-to-reel speed was 15 m/min.
The reflective silver films prepared in examples 25 to 36 were subjected to a high temperature test, a high temperature and high humidity test, and a cold thermal shock test in the above-described manner, and the change in reflectance (550nm) was measured, and the results are shown in table 6.
TABLE 6 reflectance of the silver reflective films of examples 25 to 36
Figure BDA0002882446180000132
In Table 6, reflectance is not less than 98%, reflectance is 96 to 98%, and reflectance is 92 to 96%.
Examples 37 to 48
A reflective silver film was prepared according to the method in example 1, except that it was prepared according to the structural parameters in table 7:
TABLE 7 film thickness of examples 37-48
Figure BDA0002882446180000133
Figure BDA0002882446180000141
In the preparation of the AlN layer, the atmosphere of magnetron sputtering is argon and nitrogen, the flow of argon is 40sccm, and the flow of nitrogen is 50 sccm. In the preparation of an AlN layer having a thickness of 80nm, the reel-to-reel speed was 8m/min, and in the preparation of an AlN layer having a thickness of 50nm, the reel-to-reel speed was 15 m/min.
The reflective silver films obtained in examples 37 to 48 were subjected to a high temperature test, a high temperature and high humidity test, and a cold thermal shock test in the above-described manner, and the change in reflectance (550nm) was measured, and the results are shown in table 8.
TABLE 8 reflectance of the silver reflective films of examples 37 to 48
Figure BDA0002882446180000142
In Table 8, reflectance is 98% or more, reflectance is 96 to 98% for O, and reflectance is 92 to 96% for Delta.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A reflective silver film with long service life comprises an upper PET layer, a first water-resistant layer, a silver layer, a second water-resistant layer and a lower PET layer which are contacted in sequence;
the first water resisting layer comprises a ceramic layer A and a carbon functional layer A; the second water resisting layer comprises a ceramic layer B and a carbon functional layer B;
the ceramic layer A and the ceramic layer B are respectively and independently one or more selected from silicon oxide, silicon nitride, aluminum oxide and aluminum nitride;
the carbon functional layer A and the carbon functional layer B respectively and independently comprise graphene and/or carbon nanotubes.
2. The long-life reflective silver film according to claim 1, wherein said ceramic layer a and carbon functional layer a are in contact; the ceramic layer B is in contact with the carbon functional layer B.
3. The silver reflective film according to claim 1, wherein the thickness of the ceramic layer A is 50 to 150nm, and the thickness of the ceramic layer B is 50 to 150 nm.
4. The long-life reflective silver film according to claim 1, wherein the thickness of the carbon functional layer A is 0.5 to 2.5 μm, and the thickness of the carbon functional layer B is 0.5 to 2.5 μm.
5. The method for preparing a reflective silver film having a long service life according to any one of claims 1 to 4, comprising the steps of:
A) forming a ceramic layer B on the surface of the lower PET layer through magnetron sputtering, coating and curing the carbon material slurry B to form a carbon functional layer B, and obtaining the lower PET layer compounded with a second water-blocking layer, wherein the ceramic layer B and the carbon functional layer B are formed in no sequence;
forming a ceramic layer A on the surface of the upper PET layer through magnetron sputtering, coating and curing the carbon material slurry A to form a carbon functional layer A, and obtaining the upper PET layer compounded with the first water-blocking layer, wherein the ceramic layer A and the carbon functional layer A are formed in no sequence;
B) and evaporating a silver layer on the surface of the second water-resistant layer, and then bonding the silver layer with the first water-resistant layer to obtain the reflective silver film with long service life.
6. The preparation method according to claim 5, wherein the target material for magnetron sputtering is a silicon target and/or aluminum palladium; the magnetron sputtering uses a mixed gas of argon and oxygen or a mixed gas of argon and nitrogen, and the total gas flow in the magnetron sputtering is 60-120 sccm.
7. The preparation method according to claim 5, wherein the carbon material slurry A is a polyurethane coating liquid of a carbon material, and the mass concentration of the carbon material in the carbon material slurry A is 5-20%;
the carbon material slurry B is a polyurethane coating liquid of a carbon material, and the mass concentration of the carbon material in the carbon material slurry B is 5-20%.
8. The production method according to claim 5, wherein the temperature for coating and curing the carbon material slurry A is 100 to 150 ℃;
the temperature for coating and curing the carbon material slurry B is 100-150 ℃.
9. The method according to claim 5, wherein the power of the silver film evaporation is 500 to 800 kW.
10. A backlight module comprising the long-life reflective silver film according to any one of claims 1 to 4.
CN202110003325.5A 2021-01-04 2021-01-04 Long-service-life reflective silver film, preparation method thereof and backlight module Pending CN112764143A (en)

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