CN113036049A - Flexible packaging CPI cover plate and flexible OLED display - Google Patents
Flexible packaging CPI cover plate and flexible OLED display Download PDFInfo
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- CN113036049A CN113036049A CN202110153579.5A CN202110153579A CN113036049A CN 113036049 A CN113036049 A CN 113036049A CN 202110153579 A CN202110153579 A CN 202110153579A CN 113036049 A CN113036049 A CN 113036049A
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- 238000009459 flexible packaging Methods 0.000 title claims abstract description 26
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 30
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- 150000004703 alkoxides Chemical class 0.000 claims description 10
- 239000004925 Acrylic resin Substances 0.000 claims description 9
- AZIQALWHRUQPHV-UHFFFAOYSA-N prop-2-eneperoxoic acid Chemical compound OOC(=O)C=C AZIQALWHRUQPHV-UHFFFAOYSA-N 0.000 claims description 8
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 7
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- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 claims description 5
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- 229960002130 benzoin Drugs 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 238000006482 condensation reaction Methods 0.000 claims description 2
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- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 2
- LYXOWKPVTCPORE-UHFFFAOYSA-N phenyl-(4-phenylphenyl)methanone Chemical compound C=1C=C(C=2C=CC=CC=2)C=CC=1C(=O)C1=CC=CC=C1 LYXOWKPVTCPORE-UHFFFAOYSA-N 0.000 claims description 2
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- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 16
- 239000011248 coating agent Substances 0.000 description 15
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- 238000006243 chemical reaction Methods 0.000 description 10
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- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 4
- DBCAQXHNJOFNGC-UHFFFAOYSA-N 4-bromo-1,1,1-trifluorobutane Chemical compound FC(F)(F)CCCBr DBCAQXHNJOFNGC-UHFFFAOYSA-N 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 4
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 4
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
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- 235000010354 butylated hydroxytoluene Nutrition 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000012975 dibutyltin dilaurate Substances 0.000 description 4
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Substances CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 4
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- 239000004814 polyurethane Substances 0.000 description 4
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- HVVWZTWDBSEWIH-UHFFFAOYSA-N [2-(hydroxymethyl)-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(CO)(COC(=O)C=C)COC(=O)C=C HVVWZTWDBSEWIH-UHFFFAOYSA-N 0.000 description 3
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- WSDQIHATCCOMLH-UHFFFAOYSA-N phenyl n-(3,5-dichlorophenyl)carbamate Chemical compound ClC1=CC(Cl)=CC(NC(=O)OC=2C=CC=CC=2)=C1 WSDQIHATCCOMLH-UHFFFAOYSA-N 0.000 description 3
- 238000013329 compounding Methods 0.000 description 2
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- 239000000243 solution Substances 0.000 description 2
- PSGCQDPCAWOCSH-UHFFFAOYSA-N (4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl) prop-2-enoate Chemical compound C1CC2(C)C(OC(=O)C=C)CC1C2(C)C PSGCQDPCAWOCSH-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- BDAHDQGVJHDLHQ-UHFFFAOYSA-N [2-(1-hydroxycyclohexyl)phenyl]-phenylmethanone Chemical compound C=1C=CC=C(C(=O)C=2C=CC=CC=2)C=1C1(O)CCCCC1 BDAHDQGVJHDLHQ-UHFFFAOYSA-N 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000003869 coulometry Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/841—Self-supporting sealing arrangements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/40—OLEDs integrated with touch screens
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Optics & Photonics (AREA)
- Manufacturing & Machinery (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a flexible packaging CPI cover plate and a flexible OLED display, wherein the CPI cover plate comprises at least one composite unit layer which is arranged in a stacked mode; the composite unit layer comprises a CPI base film layer, a first hardening layer arranged on the CPI base film layer and a water and oxygen blocking layer arranged on the first hardening layer. The CPI cover plate disclosed by the invention not only can realize flexible packaging, but also has an excellent water-oxygen barrier effect, and the packaging effect is effectively improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible packaging CPI cover plate and a flexible OLED display.
Background
With the continuous development of touch screen technology, flexible OLED (Organic Light-Emitting Diode) displays have attracted much attention due to their characteristics of self-luminescence, flexibility, low power consumption, etc., and adopt a flexible cover plate as a cover plate.
Although flexible OLED displays are considered to be an important direction for the development of display technology, the flexible display still faces many challenges for industrialization under the current conditions. Since flexible OLEDs are sensitive to moisture in air, the presence of moisture being a major factor affecting the lifetime of OLED devices, an important challenge for OLEDs is to reduce the permeation of water vapor and oxygen into the interior of the device. Because most plastic substrates have insufficient capacity to fully block the invasion of external impurity liquid and gas, metal cathodes used by OLED devices are generally aluminum, magnesium, calcium and other active metals, and are very easy to react with water vapor permeating into the metal cathodes to influence the injection of charges. In addition, the permeated water and oxygen may chemically react with the organic light emitting material, and these reactions may cause a reduction in device performance.
The traditional flexible packaging structure of the OLED device uses metal or glass as a cover plate. Although metal or glass as a cover plate has excellent water and oxygen barrier capability, stable chemical properties, electric shielding property, heat conduction and other characteristics, the metal or glass can affect the bending capability of the device, is not suitable for packaging flexible devices, and has very limited development prospect in a non-flexible packaging method under the great trend of flexible development.
Most of the existing flexible packaging cover plates are realized by compounding multiple layers of films, and the light transmission is influenced due to the fact that the multiple layers of films are large in thickness after compounding, and the water and oxygen barrier capability still cannot reach an ideal level. In order to meet the commercialization requirement, it is important to develop a novel OLED encapsulation cover plate.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a flexible packaging CPI cover plate and a flexible OLED display.
The invention provides a flexible packaging CPI cover plate which comprises at least one composite unit layer which is stacked; the composite unit layer comprises a CPI base film layer, a first hardening layer arranged on the CPI base film layer and a water and oxygen blocking layer arranged on the first hardening layer.
Preferably, the CPI-based film layer is a transparent polyimide layer, the first hardened layer is a polyacrylic resin layer, and the water-oxygen barrier layer is an inorganic oxide layer.
Preferably, the laminated composite unit layers are attached through OCA photosynthetic glue.
Preferably, the CPI cover plate further comprises a PET layer disposed on the composite unit layer and a second hardened layer disposed on the PET layer;
preferably, the second hardened layer is also a polyacrylic resin layer.
Preferably, the polyacrylic resin layer is obtained by coating a hardening liquid on the surface of the CPI-based film layer and then curing the hardening liquid, wherein the hardening liquid comprises urethane acrylate and hydroxyl acrylate;
preferably, the urethane acrylate is obtained by condensation reaction of a polyol of a hydroxyl silicone oil with an isocyanate and a hydroxyl acrylate.
Preferably, the hardening liquid further includes a photopolymerization initiator;
preferably, the photopolymerization initiator is at least one of 1-hydroxy-cyclohexylphenyl ketone, benzoin dimethyl ether, 2, 4, 6-trimethylbenzoyldiphenylphosphine oxide, or 4-phenylbenzophenone.
Preferably, the water-oxygen barrier layer is obtained by coating a barrier liquid on the surface of the first hardened layer and then performing wet heat treatment on the barrier liquid, wherein the barrier liquid comprises a metal alkoxide;
preferably, the metal alkoxide is of formula M (OR)nThe metal alkoxide is represented by M is at least one of silicon, titanium and aluminum, and R is an alkyl group having 1 to 5 carbon atoms.
Preferably, the barrier fluid further comprises an organic solvent;
preferably, the organic solvent is at least one of hydrocarbon alcohols, alkylene glycols or glycol ethers.
The invention also provides a flexible OLED display which comprises the flexible packaging CPI cover plate.
The invention provides a flexible packaging CPI cover plate which comprises at least one composite unit layer which is stacked, wherein the composite unit layer comprises a CPI base film layer, a first hardening layer arranged on the CPI base film layer and a water and oxygen blocking layer arranged on the first hardening layer, the CPI base film layer is a transparent film layer and provides good flexibility for the cover plate, the first hardening layer provides good hardness for the cover plate, the hardness and stiffness of the cover plate are improved, the water and oxygen blocking layer provides excellent water and oxygen blocking performance for the cover plate, and the packaging performance of the cover plate is improved. The CPI cover sheet obtained by the above structure can be effectively used in a foldable display device, particularly, a flexible OLED display.
The first hardening layer is made of polyacrylic resin and is obtained by coating hardening liquid comprising urethane acrylate and hydroxy acrylate on the surface of the CPI base film and then performing curing reaction, so that the obtained hardening layer not only can provide better hardness for the cover plate, but also can increase the light-emitting rate of the cover plate and improve the display effect of the display device. The water-oxygen blocking layer is made of inorganic oxide, and is obtained by coating the blocking liquid containing metal alkoxide on the surface of the first hardened layer and then carrying out damp-heat treatment, so that the metal alkoxide is hydrolyzed on the surface of the first hardened layer to form a compact inorganic oxide layer, good water-oxygen blocking performance can be provided for the cover plate, metal ion migration of the touch layer is avoided, and a good packaging effect is obtained.
Furthermore, since the first hardened layer is obtained by polymerizing urethane acrylate and hydroxyl acrylate, on the one hand, the urethane acrylate is specifically obtained by reacting a polyol of hydroxyl silicone oil with isocyanate and hydroxyl acrylate, and the resulting hardened layer has a polysiloxane structure, and can form affinity for inorganic oxide generated by hydrolysis of metal alkoxide in the barrier liquid, thereby ensuring adsorptive adhesion of the inorganic oxide layer; on the other hand, the existence of the acrylic acid hydroxyl ester enables the obtained polyacrylic resin to have a large number of hydroxyl structures, and the polyacrylic resin can also adsorb metal alkoxide, so that the blocking liquid can form a uniform liquid film on the surface of the hardened layer and can be effectively hydrolyzed into a compact inorganic oxide layer.
Drawings
Fig. 1 is a schematic structural diagram of a CPI cover plate according to embodiment 1 of the present invention.
Detailed Description
Hereinafter, the technical solution of the present invention will be described in detail by specific examples, but these examples should be explicitly proposed for illustration, but should not be construed as limiting the scope of the present invention.
Example 1
As can be seen from fig. 1, the flexible packaging CPI cover plate comprises two laminated composite unit layers 10, a PET layer 11 arranged on the composite unit layer 10, and a second hardened layer 12 arranged on the PET layer 11, wherein the composite unit layers comprise a CPI base film layer 110, a first hardened layer 120 arranged on the CPI base film layer, and a water-oxygen barrier layer 130 arranged on the first hardened layer 120;
the preparation method of the flexible packaging CPI cover plate comprises the following steps:
(1) taking the transparent polyimide film as the CPI base film layer 110;
(2) forming a first hardened layer 120 on the surface of the CPI base film layer 110;
(3) continuously forming a water-oxygen barrier layer 130 on the surface of the first hardened layer 120 to obtain a composite unit layer 10;
(4) the two layers of composite unit layers 10 are attached, one side of the water oxygen blocking layer 130 of one of the composite unit layers 10 is attached to the PET layer 11, then a second hardened layer 12 is formed on the surface of the PET layer, the forming process of the second hardened layer 12 is the same as that of the first hardened layer 120, and finally the flexible packaging CPI cover plate is obtained.
Example 2
A flexible packaging CPI cover plate is prepared by the following steps:
(1) taking a transparent polyimide film as a CPI base film layer, wherein the light transmittance of the transparent polyimide film is about 90%, and the thickness of the transparent polyimide film is about 50 μm;
(2) forming a first hardening layer on the surface of the CPI base film layer, wherein the first hardening layer is specificallyThe surface of the CPI base film layer was coated with a curing liquid having a coating film thickness of about 20 μm at a rate of 0.5J/cm2The hardening liquid is subjected to ultraviolet curing by the energy of the energy to obtain the ultraviolet curing hardening liquid;
here, the hardening liquid is obtained by mixing components including 45 wt% of urethane acrylate, 20 wt% of hydroxyethyl methacrylate, 17 wt% of pentaerythritol triacrylate, 12 wt% of ethylene glycol dimethacrylate, 3 wt% of 1-hydroxycyclohexyl phenyl ketone, and 3 wt% of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide uniformly, and stirring at 50 ℃ for 0.5 h;
the polyurethane acrylate is prepared by uniformly mixing isophorone diisocyanate and hydroxy silicone oil (the number average molecular weight is 2000) in a molar ratio of 1:0.5, adding a polymerization inhibitor 2, 6-di-tert-butyl-p-cresol with the molar weight of 0.3% of isophorone diisocyanate, uniformly mixing, adding dibutyltin dilaurate with the molar weight of 0.1% of isophorone diisocyanate in an ice bath, stirring and keeping at 40 ℃ for reaction for 2 hours, adding hydroxyethyl acrylate with the molar weight of 80% of isophorone diisocyanate, stirring and keeping at 60 ℃ for reaction for 4 hours;
(3) continuously forming a water and oxygen blocking layer on the surface of the first hardened layer to finally obtain a composite unit layer, wherein the water and oxygen blocking layer is obtained by coating a blocking liquid with the thickness of about 10 mu m on the surface of the first hardened layer, and performing damp-heat treatment on the blocking liquid, specifically, heating to 60 ℃ under the condition that the relative humidity is 90%, preserving heat for 1h, continuously heating to 120 ℃, and preserving heat for 2 h;
the barrier liquid is prepared by adding 5mL of tetrabutyl titanate into 30mL of absolute ethyl alcohol, stirring and mixing uniformly at room temperature, adding 20mL of tetraethoxysilane, and stirring and mixing uniformly at room temperature;
(4) adhering one composite unit layer with the other composite unit layer, specifically adhering the water oxygen barrier layer of one composite unit layer with the CPI base film layer of the other composite unit layer by using OCA (optically clear adhesive);
reuse OCA light and glue the water oxygen barrier layer and the PET layer (the luminousness is about 90%) that will compound the unit layer above-mentioned and laminate, form the second sclerosis layer on the surface on PET layer after that, the formation process on second sclerosis layer is the same with first sclerosis layer, finally obtains flexible encapsulation CPI apron.
Example 3
A flexible packaging CPI cover plate is prepared by the following steps:
(1) taking a transparent polyimide film as a CPI base film layer, wherein the light transmittance of the transparent polyimide film is about 90%, and the thickness of the transparent polyimide film is about 50 μm;
(2) forming a first hardened layer on the surface of the CPI base film layer, wherein the first hardened layer is formed by coating a hardening liquid with a coating film thickness of about 20 μm on the surface of the CPI base film layer at a rate of 0.5J/cm2The hardening liquid is subjected to ultraviolet curing by the energy of the energy to obtain the ultraviolet curing hardening liquid;
the hardening liquid is obtained by uniformly mixing components comprising 45 wt% of urethane acrylate, 20 wt% of hydroxyethyl methacrylate, 17 wt% of pentaerythritol triacrylate, 12 wt% of ethylene glycol dimethacrylate, 3 wt% of 1-hydroxycyclohexyl benzophenone and 3 wt% of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, and stirring at 50 ℃ for 0.5 h;
the polyurethane acrylate is prepared by uniformly mixing isophorone diisocyanate and hydroxy silicone oil (number average molecular weight 2000) in a molar ratio of 1:0.5, adding polymerization inhibitor 2, 6-di-tert-butyl-p-cresol accounting for 0.3% of the molar weight of isophorone diisocyanate, uniformly mixing, adding dibutyltin dilaurate accounting for 0.1% of the molar weight of isophorone diisocyanate in an ice bath, stirring and keeping at 40 ℃ for reaction for 2 hours, adding hydroxyethyl acrylate accounting for 80% of the molar weight of isophorone diisocyanate, stirring and keeping at 60 ℃ for reaction for 4 hours;
(3) continuously forming a water and oxygen blocking layer on the surface of the first hardened layer to finally obtain a composite unit layer, wherein the water and oxygen blocking layer is obtained by coating a blocking liquid with the thickness of about 10 mu m on the surface of the first hardened layer, and performing damp-heat treatment on the blocking liquid, specifically, heating to 60 ℃ under the condition that the relative humidity is 90%, preserving heat for 1h, continuously heating to 120 ℃, and preserving heat for 2 h;
the barrier liquid is prepared by adding 5g of aluminum isopropoxide into 30mL of absolute ethanol, stirring and mixing uniformly at room temperature, adding 20mL of tetraethoxysilane, and stirring and mixing uniformly at room temperature;
(4) adhering one composite unit layer with the other composite unit layer, specifically adhering the water oxygen barrier layer of one composite unit layer with the CPI base film layer of the other composite unit layer by using OCA (optically clear adhesive);
reuse OCA light and glue the water oxygen barrier layer and the PET layer (the luminousness is about 90%) that will compound the unit layer above-mentioned and laminate, form the second sclerosis layer on the surface on PET layer after that, the formation process on second sclerosis layer is the same with first sclerosis layer, finally obtains flexible encapsulation CPI apron.
Example 4
A flexible packaging CPI cover plate is prepared by the following steps:
(1) taking a transparent polyimide film as a CPI base film layer, wherein the light transmittance of the transparent polyimide film is about 90%, and the thickness of the transparent polyimide film is about 50 μm;
(2) forming a first hardened layer on the surface of the CPI base film layer, wherein the first hardened layer is formed by coating a hardening liquid with a coating film thickness of about 20 μm on the surface of the CPI base film layer at a rate of 0.5J/cm2The hardening liquid is subjected to ultraviolet curing by the energy of the energy to obtain the ultraviolet curing hardening liquid;
the hardening liquid is obtained by uniformly mixing components comprising 45 wt% of urethane acrylate, 20 wt% of hydroxyethyl methacrylate, 17 wt% of pentaerythritol triacrylate, 12 wt% of ethylene glycol dimethacrylate, 3 wt% of 1-hydroxycyclohexyl phenyl ketone and 3 wt% of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, and stirring at 50 ℃ for 0.5 h;
the polyurethane acrylate is prepared by uniformly mixing isophorone diisocyanate and polyethylene glycol (with the number average molecular weight of 1000) in a molar ratio of 1:0.5, adding a polymerization inhibitor 2, 6-di-tert-butyl-p-cresol with the molar weight of 0.3% of isophorone diisocyanate, uniformly mixing, adding dibutyltin dilaurate with the molar weight of 0.1% of isophorone diisocyanate in an ice bath, stirring and keeping at 40 ℃ for reaction for 2 hours, adding hydroxyethyl acrylate with the molar weight of 80% of isophorone diisocyanate, stirring and keeping at 60 ℃ for reaction for 4 hours;
(3) continuously forming a water and oxygen blocking layer on the surface of the first hardened layer to finally obtain a composite unit layer, wherein the water and oxygen blocking layer is obtained by coating a blocking liquid with the thickness of about 10 mu m on the surface of the first hardened layer, and performing damp-heat treatment on the blocking liquid, specifically, heating to 60 ℃ under the condition that the relative humidity is 90%, preserving heat for 1h, continuously heating to 120 ℃, and preserving heat for 2 h;
the barrier liquid is prepared by adding 5mL of tetrabutyl titanate into 30mL of absolute ethyl alcohol, stirring and mixing uniformly at room temperature, adding 20mL of tetraethoxysilane, and stirring and mixing uniformly at room temperature;
(4) adhering one composite unit layer with the other composite unit layer, specifically adhering the water oxygen barrier layer of one composite unit layer with the CPI base film layer of the other composite unit layer by using OCA (optically clear adhesive);
reuse OCA light and glue the water oxygen barrier layer and the PET layer (the luminousness is about 90%) that will compound the unit layer above-mentioned and laminate, form the second sclerosis layer on the surface on PET layer after that, the formation process on second sclerosis layer is the same with first sclerosis layer, finally obtains flexible encapsulation CPI apron.
Example 5
A flexible packaging CPI cover plate is prepared by the following steps:
(1) taking a transparent polyimide film as a CPI base film layer, wherein the light transmittance of the transparent polyimide film is about 90%, and the thickness of the transparent polyimide film is about 50 μm;
(2) forming a first hardened layer on the surface of the CPI base film layer, wherein the first hardened layer is formed by coating a hardening liquid with a coating film thickness of about 20 μm on the surface of the CPI base film layer at a rate of 0.5J/cm2The hardening liquid is subjected to ultraviolet curing by the energy of the energy to obtain the ultraviolet curing hardening liquid;
the hardening liquid is obtained by uniformly mixing components comprising 45 wt% of urethane acrylate, 20 wt% of butyl acrylate, 17 wt% of isobornyl acrylate, 12 wt% of ethylene glycol dimethacrylate, 3 wt% of 1-hydroxycyclohexyl phenyl ketone and 3 wt% of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide and stirring at 50 ℃ for 0.5 h;
the polyurethane acrylate is prepared by uniformly mixing isophorone diisocyanate and hydroxy silicone oil (number average molecular weight 2000) in a molar ratio of 1:0.5, adding polymerization inhibitor 2, 6-di-tert-butyl-p-cresol accounting for 0.3% of the molar weight of isophorone diisocyanate, uniformly mixing, adding dibutyltin dilaurate accounting for 0.1% of the molar weight of isophorone diisocyanate in an ice bath, stirring and keeping at 40 ℃ for reaction for 2 hours, adding hydroxyethyl acrylate accounting for 80% of the molar weight of isophorone diisocyanate, stirring and keeping at 60 ℃ for reaction for 4 hours;
(3) continuously forming a water and oxygen blocking layer on the surface of the first hardened layer to finally obtain a composite unit layer, wherein the water and oxygen blocking layer is obtained by coating a blocking liquid with the thickness of about 10 mu m on the surface of the first hardened layer, and performing damp-heat treatment on the blocking liquid, specifically, heating to 60 ℃ under the condition that the relative humidity is 90%, preserving heat for 1h, continuously heating to 120 ℃, and preserving heat for 2 h;
the barrier liquid is prepared by adding 5mL of tetrabutyl titanate into 30mL of absolute ethyl alcohol, stirring and mixing uniformly at room temperature, adding 20mL of tetraethoxysilane, and stirring and mixing uniformly at room temperature;
(4) adhering one composite unit layer with the other composite unit layer, specifically adhering the water oxygen barrier layer of one composite unit layer with the CPI base film layer of the other composite unit layer by using OCA (optically clear adhesive);
then utilize OCA light to glue the water oxygen barrier layer and the PET layer (the luminousness is about 90%) of above-mentioned compound unit layer and laminate again, form the second sclerosis layer on the surface on PET layer next, the formation process on second sclerosis layer is the same with first sclerosis layer, finally obtains flexible encapsulation CPI apron.
The CPI cover sheets prepared in the above examples were tested for performance and the results are shown in table 1.
Water vapor transmission rate: the Water Vapor Transmission Rate (WVTR) was measured at 40 ℃ and a relative humidity of 90% according to the national Standard GB/T21529-.
Oxygen transmission rate: the Oxygen Transmission Rate (OTR) was measured at 25 ℃ and a relative humidity of 60% according to the Coulometric test of the permeability test of packaging materials for plastics films and sheets by the national standard GB/T19789-2005.
Bending performance: and (3) observing whether peeling, cracks, whitening, bubbles and folding are generated after the dynamic bending R is bent for 20 ten thousand times at the angle of 2mm and 180 degrees by a bending tester.
Table 1 test results of CPI cover plate obtained in example
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The CPI cover plate for the flexible package is characterized by comprising at least one composite unit layer which is arranged in a stacked mode; the composite unit layer comprises a CPI base film layer, a first hardening layer arranged on the CPI base film layer and a water and oxygen blocking layer arranged on the first hardening layer.
2. A flexible packaging CPI cover sheet in accordance with claim 1, wherein the CPI-based film layer is a transparent polyimide layer, the first stiffening layer is a polyacrylic resin layer, and the water-oxygen barrier layer is an inorganic oxide layer.
3. A flexible packaging CPI cover sheet according to claim 1 or 2, wherein the stacked layers of composite units are attached by OCA photosynthetic glue.
4. A flexible packaging CPI cover sheet according to any one of claims 1 to 3, further comprising a PET layer disposed on the composite unit layer and a second hardened layer disposed on the PET layer;
preferably, the second hardened layer is also a polyacrylic resin layer.
5. A flexible packaging CPI cover sheet according to any one of claims 2-4 wherein the polyacrylic resin layer is obtained by applying a hardening liquid to the surface of the CPI base film layer and then curing the hardening liquid, wherein the hardening liquid comprises urethane acrylate and hydroxy acrylate;
preferably, the urethane acrylate is obtained by condensation reaction of a polyol of a hydroxyl silicone oil with an isocyanate and a hydroxyl acrylate.
6. A flexible packaging CPI cover sheet in accordance with claim 5, wherein the stiffening fluid further comprises a photopolymerization initiator;
preferably, the photopolymerization initiator is at least one of 1-hydroxy-cyclohexylphenyl ketone, benzoin dimethyl ether, 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, or 4-phenylbenzophenone.
7. A flexible packaging CPI cover sheet in accordance with any one of claims 1-6 wherein the water and oxygen barrier layer is formed by applying a barrier fluid to the surface of the first hardened layer and subjecting the barrier fluid to a wet heat treatment, wherein the barrier fluid comprises a metal alkoxide;
preferably, the metal alkoxide is of formula M (OR)nThe metal alkoxide is represented by M is at least one of silicon, titanium and aluminum, and R is an alkyl group having 1 to 5 carbon atoms.
8. A flexible packaging CPI cover sheet in accordance with claim 7, wherein the barrier fluid further comprises an organic solvent;
preferably, the organic solvent is at least one of hydrocarbon alcohols, alkylene glycols or glycol ethers.
9. A flexible OLED display comprising the flexible encapsulated CPI cover sheet according to any one of claims 1 to 8.
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