CN113861475A - Polyester film for optical display and preparation method thereof - Google Patents
Polyester film for optical display and preparation method thereof Download PDFInfo
- Publication number
- CN113861475A CN113861475A CN202111143504.5A CN202111143504A CN113861475A CN 113861475 A CN113861475 A CN 113861475A CN 202111143504 A CN202111143504 A CN 202111143504A CN 113861475 A CN113861475 A CN 113861475A
- Authority
- CN
- China
- Prior art keywords
- polyester film
- weight
- substrate layer
- parts
- reflection coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920006267 polyester film Polymers 0.000 title claims abstract description 145
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 238000000576 coating method Methods 0.000 claims abstract description 149
- 239000011248 coating agent Substances 0.000 claims abstract description 148
- 239000000758 substrate Substances 0.000 claims abstract description 119
- 238000002834 transmittance Methods 0.000 claims abstract description 47
- 239000010410 layer Substances 0.000 claims description 189
- 239000007788 liquid Substances 0.000 claims description 90
- 239000011247 coating layer Substances 0.000 claims description 55
- 239000013078 crystal Substances 0.000 claims description 42
- 239000002245 particle Substances 0.000 claims description 25
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 229920000178 Acrylic resin Polymers 0.000 claims description 17
- 239000004925 Acrylic resin Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 229920000728 polyester Polymers 0.000 claims description 16
- -1 polyethylene terephthalate Polymers 0.000 claims description 15
- 239000006117 anti-reflective coating Substances 0.000 claims description 13
- 239000002518 antifoaming agent Substances 0.000 claims description 12
- 238000001723 curing Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 229920001225 polyester resin Polymers 0.000 claims description 10
- 239000004645 polyester resin Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 9
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000010345 tape casting Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 230000009477 glass transition Effects 0.000 claims description 4
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 4
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 150000002148 esters Chemical class 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 238000013007 heat curing Methods 0.000 claims description 2
- 239000010408 film Substances 0.000 description 57
- 230000000052 comparative effect Effects 0.000 description 32
- 238000000411 transmission spectrum Methods 0.000 description 29
- 239000000203 mixture Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 13
- 238000009826 distribution Methods 0.000 description 8
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000002310 reflectometry Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000004383 yellowing Methods 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000012788 optical film Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- WOZVHXUHUFLZGK-UHFFFAOYSA-N dimethyl terephthalate Chemical compound COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004736 wide-angle X-ray diffraction Methods 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- CJDPJFRMHVXWPT-UHFFFAOYSA-N barium sulfide Chemical compound [S-2].[Ba+2] CJDPJFRMHVXWPT-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 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 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/062—Copolymers with monomers not covered by C09D133/06
- C09D133/066—Copolymers with monomers not covered by C09D133/06 containing -OH groups
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2433/08—Homopolymers or copolymers of acrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2244—Oxides; Hydroxides of metals of zirconium
Abstract
The invention discloses a polyester film for optical display, which comprises a substrate layer, wherein a first anti-reflection coating and a second anti-reflection coating are arranged on two sides of the substrate layer and used for increasing the light transmittance of the substrate layer; wherein T1/T2 is 0.92-1, T2/T3 is 0.93-1, T2 is more than or equal to 91%, T1 is the light transmittance of the polyester film at a wavelength of 450nm, T2 is the light transmittance of the polyester film at a wavelength of 550nm, and T3 is the light transmittance of the polyester film at a wavelength of 650 nm. The invention also discloses a preparation method of the polyester film.
Description
Technical Field
The invention relates to the field of optical display new material technology and related technology application, in particular to a polyester film for optical display and a preparation method thereof.
Background
With the rapid development of information dissemination technology, new display panels such as televisions, mobile phones, computers, vehicles and the like are becoming more and more unavailable in various industries. Currently, Liquid Crystal Displays (LCDs) and Organic Light Emitting Displays (OLEDs) are the mainstream new displays. The LCD display principle is that the transmittance of light emitted by a backlight source is controlled by performing orientation control on liquid crystal molecules supported by two polaroids, and a color image display effect is obtained by using technologies such as a color filter and the like; the OLED achieves a color display effect by controlling the self-luminescence of the organic light-emitting layer material. With the increase of outdoor applications of display panels such as vehicle-mounted display, outdoor advertisement display panels, etc., it is necessary to increase the overall brightness of the display panel in order to obtain a clear image from the display panel, but increasing the brightness of the display panel in both LCD and OLED is accompanied by increasing the light emitting power of the display panel. Increasing the luminous power not only causes the display panel to generate heat seriously, but also brings about energy consumption improvement, which is a theme not in accordance with the current energy saving and emission reduction and green low-carbon development.
Taking LCD liquid crystal display as an example, the display panel comprises a backlight module and a display module, but it is essential that a polymer film with various functions, such as a diffusion film, an incremental film, a polarizer, an ITO conductive base film, etc., is laminated above the backlight source, and the brightness of the display screen depends on the light emitting power of the backlight source and the total light transmittance of the functional film. On the other hand, the polyester film has the characteristics of high strength, high rigidity, transparency, good heated dimensional stability and the like, and is widely applied to novel display panels, such as diffusion films and antireflection films in backlight modules; a polaroid support film, a phase difference film and an ITO conductive film in the display module; and protective films, release films and the like in the processing and transportation of optical components such as polaroids and the like. According to statistics, more than 10 polyester films with special functions are required to be used in the processes of processing, production, transportation, assembly and the like of the whole LCD display panel, however, for polyester materials, the light transmittance is usually about 87% -89%, compared with other materials such as cellulose triacetate, polymethyl methacrylate, polycarbonate and the like, the polyester film has the light transmittance of more than 92%, and therefore, the improvement of the light transmittance of the polyester base film has important significance for the improvement of the light transmittance of the whole display panel and the reduction of energy consumption.
On the other hand, in the new display, a higher color difference reduction degree is required to be ensured under the condition of pursuing parameters such as brightness, contrast and the like. However, the polyester film is yellow in color due to raw material synthesis and conventional processing, that is, when the polyester film is used in a novel display module, the color of the whole light of the colored light is affected, and the color of the visual sense color is not bright enough.
Disclosure of Invention
Technical problem to be solved
In view of the above, the present invention provides a polyester film for optical display and a method for preparing the same, which solves at least one of the above problems.
(II) technical scheme
The invention provides a polyester film for optical display, which comprises a substrate layer, wherein a first anti-reflection coating and a second anti-reflection coating are arranged on two sides of the substrate layer and used for increasing the light transmittance of the substrate layer; wherein T1/T2 is 0.92-1, T2/T3 is 0.93-1, T2 is more than or equal to 91%, T1 is the light transmittance of the polyester film at a wavelength of 450nm, T2 is the light transmittance of the polyester film at a wavelength of 550nm, and T3 is the light transmittance of the polyester film at a wavelength of 650 nm.
In some embodiments, the grain size of the base layer is 0.3 to 13nm, preferably 1 to 10 nm.
In some embodiments, the substrate layer has an in-plane birefringence of 0.03 to 0.15, preferably 0.05 to 0.13.
In some embodiments, the substrate layer comprises polyethylene terephthalate, polyethylene terephthalate and polyethylene naphthalate, or polyethylene terephthalate-1, 4-cyclohexanedimethanol ester.
In some embodiments, the thickness of the base layer is 30 to 300 μm, preferably 50 to 250 μm.
In some embodiments, the first anti-reflection coating layer or the second anti-reflection coating layer comprises water-based polyester, acrylic resin, a curing agent, refractive index adjusting particles, a leveling agent and an antifoaming agent.
In some embodiments, the first antireflective coating or the second antireflective coating comprises:
10-50 parts by weight of water-based polyester, preferably 15-45 parts by weight;
40-90 parts by weight of acrylic resin, preferably 45-70 parts by weight;
0.1-3 parts by weight of a curing agent;
0.01 to 5 parts by weight of refractive index-adjusting particles, preferably 0.1 to 3 parts by weight;
0.01-0.5 parts by weight of a leveling agent;
0.01 to 0.5 parts by weight of a defoaming agent.
In some embodiments, the refractive index adjusting particles comprise one or more of zirconia, magnesia, alumina, titania.
In some embodiments, the thickness of the first or second antireflective coating is 10 to 300nm, preferably 50 to 180 nm.
The invention also provides a preparation method of the polyester film, which comprises the following steps: preparing a substrate layer; preparing anti-reflection coating liquid; and coating the anti-reflection coating liquid on two sides of the substrate layer and performing heat curing to obtain the polyester film.
In some embodiments, preparing an antireflective coating solution comprises: stirring and mixing 10-50 parts by weight of water-based polyester, 40-90 parts by weight of acrylic resin, 0.1-3 parts by weight of curing agent, 0.01-5 parts by weight of refractive index adjusting particles, 0.01-0.5 part by weight of flatting agent and 0.01-0.5 part by weight of defoaming agent, and then carrying out ultrasonic treatment to obtain the anti-reflection coating liquid.
In some embodiments, preparing a substrate layer comprises: carrying out melt extrusion and tape casting on polyester resin to obtain a tape casting sheet; carrying out primary longitudinal stretching on the casting sheet to obtain a first stretched polyester film; performing a relaxation process on the first stretched polyester film; performing secondary transverse stretching on the first stretched polyester film to obtain a second stretched polyester film; the second stretched polyester film is heat-treated to obtain a base layer.
In some embodiments, the first draw ratio of the first longitudinal draw is ≦ 4; and/or
The treatment amount of the relaxation treatment is 0.1 to 10 percent; and/or
The second stretching ratio of the second transverse stretching is 3-6.
In some embodiments, the heat treatment temperature is from Tg +120 ℃ to Tg +180 ℃ and Tg is the glass transition temperature of the polyester resin.
(III) advantageous effects
According to the invention, the anti-reflection coating layers are coated on the two sides of the substrate layer to form the first anti-reflection coating layer and the second anti-reflection coating layer, the reflectivity is reduced by utilizing the coherent cancellation of the reflected light of the incident light at different interfaces, and the light transmittance of the substrate layer film is further improved.
According to the invention, the size of crystal grains in the film is designed, the refractive index adjusting particles are uniformly dispersed, and the wavelength distribution of the transmitted light is adjusted by utilizing the difference of the refractive index of the dispersed refractive index adjusting particles to the light, so that the transmitted light has higher uniformity in the visible wavelength range, namely, the light transmittance is weaker in dispersion along with the wavelength, the yellowing degree of the film is reduced, the film is more transparent, and the film can be used as a base film of an optical film in liquid crystal display or organic light-emitting display.
Drawings
FIG. 1 is a schematic structural diagram of a polyester film for optical display according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for preparing a polyester film for optical display according to an embodiment of the present invention;
FIG. 3 is a diagram showing a distribution of transmittance with wavelength of a polyester film for optical display at a wavelength of 400nm to 800nm according to an embodiment of the present invention;
fig. 4 is a wavelength distribution diagram of surface reflectance of the substrate layer without the anti-reflection coating layer and the substrate layer coated with the anti-reflection coating layer according to the embodiment of the present invention.
[ description of reference ]
100-polyester film for optical display;
10-a first antireflective coating;
20-a base layer;
30-second anti-reflection coating
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The invention mainly aims to provide an optical film with high light transmittance and low haze and a preparation method thereof, and aims to solve the problems that the existing optical polyester film is low in light transmittance and yellow in color, and the display color is poor when the existing optical polyester film is applied to optical display.
FIG. 1 is a schematic structural diagram of a polyester film for optical display according to an embodiment of the present invention.
As shown in fig. 1, the present invention provides a polyester film 100 for optical display, including a substrate layer 20, a first anti-reflection coating 10 and a second anti-reflection coating 30 disposed on two sides of the substrate layer 20, the first anti-reflection coating 10 and the second anti-reflection coating 30 being used to increase light transmittance of the substrate layer 20; wherein T1/T2 is 0.92-1, T2/T3 is 0.93-1, T2 is more than or equal to 91%, T1 is the light transmittance of the polyester film 100 at a wavelength of 450nm, T2 is the light transmittance of the polyester film 100 at a wavelength of 550nm, and T3 is the light transmittance of the polyester film 100 at a wavelength of 650 nm.
In the embodiment of the invention, the first anti-reflection coating layer 10 and the second anti-reflection coating layer 30 are formed by coating anti-reflection coating layers on two sides of the substrate layer 20, and the reflectivity is reduced by utilizing the coherent cancellation of the reflected light of the incident light at different interfaces, so that the light transmittance of the film of the substrate layer 20 is improved.
The polyester film has a T1/T2 ratio of 0.92 to 1, and when T1/T2 is less than 0.92, the color of the polyester film is dark yellow, and T1/T2 is more than 1, which is difficult to achieve, and preferably, T1/T2 is 0.93 to 0.995.
The polyester film has a T2/T3 ratio of 0.93 to 1, and when T2/T3 is less than 0.93, the color of the polyester film is dark red, the color of the polyester film is dark, T2/T3 is more than 1, which is difficult to achieve, and T2/T3 is preferably 0.94 to 0.998.
When the polyester film is used for optical display, T2 is required to be 91% or more. When T2 is less than 91%, the overall transmittance of the film is reduced and the photosensitive effect is relatively dark, which is disadvantageous for the use of the film in optical displays.
According to the embodiment of the present invention, the crystal grain size of the base layer 20 is 0.3 to 13nm, preferably 1 to 10nm, for example, 0.3nm, 1nm, 5nm, 10nm, 13 nm.
According to an embodiment of the present invention, the crystal grain size of the base layer 20 is a crystal grain size of a (100) crystal plane. The crystal grain size of the substrate layer 20 is 0.3-13 nm, when the crystal grain size is 0.3-13 nm, the substrate layer 20 has good light transmittance, and meanwhile, the surface of the substrate layer 20 has good wettability to the coating and can also play a role in adjusting the light transmittance along with the wavelength distribution. The smaller the grain size, the smaller the influence of the crystal structure on the light transmittance of the base layer 20, and the better the wettability and adsorbability of the film surface of the base layer 20 to the antireflection coating, but it is not easy to achieve the case of achieving both high crystallinity and small grain size control in the actual processing. Therefore, the lower limit of the grain size of the base layer 20 is preferably 0.5 nm. The larger the crystal grain size, the higher the strength and heat resistance of the film, but the larger the crystal grain size, the more ineffective scattering, refraction, etc. of light in the film increase, which affects the dispersion characteristic of light transmittance with wavelength, and causes yellowing of the film, so the upper limit of the crystal grain size of the base layer 20 is preferably 10 nm.
According to the embodiment of the invention, the x-ray wide angle diffraction (WAXD) technology is adopted, and the grain size is calculated according to the half-height peak width of the crystal plane diffraction peak and the Scherrer formula. By peak fitting in calculating crystallinity, not only can the diffraction peak area A of the crystal be obtainedcAnd amorphous diffraction Peak area AaIt is also possible to obtain the full width at half maximum (FWHM) of diffraction peaks of different crystal planes such as the (010) crystal plane and the (100) crystal plane, the diffraction angle θ of each diffraction peak, and the x-ray wavelength. The grain sizes of different crystal planes can be obtained according to the scherrer formula, as shown in formula (1):
wherein S is(hkl)Crystal grain size of crystal faceI.e. S(010)Grain size, S, representing the (010) crystal plane(100)Represents the crystal grain size of the (100) crystal plane, k is 0.89, lambda is the x-ray wavelength, theta is the diffraction angle of the crystal plane at this wavelength, beta(hkl)Is the full width at half maximum (FWHM) of the diffraction peak of the crystal plane, b is the broadening factor of the device, here taken to be 0.15; b, beta(hkl)And θ are in degrees (°).
According to an embodiment of the present invention, the in-plane birefringence of the base layer 20 is 0.03 to 0.15, preferably 0.05 to 0.13, and may be, for example, 0.03, 0.05, 0.09, 0.13, 0.15.
The in-plane birefringence of the film characterizes the average degree of orientation of molecular chains in the film. According to the embodiment of the present invention, the in-plane birefringence of the substrate layer 20 is 0.03 to 0.15, and when the in-plane birefringence is less than 0.03, the orientation of the film is insufficient, which may result in a decrease in the mechanical strength of the substrate layer 20, and in particular, a decrease in the elongation at break of the substrate layer 20; when the in-plane birefringence is greater than 0.15, too high orientation of the film may cause poor wettability of first antireflection coating 10 or second antireflection coating 30 on the surface of substrate layer 20, and may cause peeling of the antireflection coating, and therefore the in-plane birefringence of substrate layer 20 is preferably 0.05 to 0.13.
According to embodiments of the present invention, the substrate layer 20 comprises polyethylene terephthalate, polyethylene terephthalate and polyethylene naphthalate, or polyethylene terephthalate-1, 4-cyclohexanedimethanol ester. Polyethylene terephthalate is preferably used as the material for forming the base layer 20, from the viewpoint of the overall performance, cost, and the like.
According to an embodiment of the present invention, the thickness of the base layer 20 is 30 to 300 μm, preferably 50 to 250 μm, and may be 30 μm, 50 μm, 150 μm, 250 μm, or 300 μm, for example. The base layer 20 needs to have a certain flexibility and strength, and the thinner the base layer 20 is, the higher the light transmittance is, but when the thickness of the base layer 20 is less than 30 μm, the strength of the polyester film is greatly reduced, which does not meet the strength requirement of the optical display film. When the thickness of the base layer 20 is greater than 300 μm, the base layer 20 has a greater strength, but the flexibility thereof becomes poor, which does not meet the requirement of thin film display, and therefore the thickness of the base layer 20 is 30 to 300 μm, preferably 50 to 250 μm.
According to an embodiment of the invention, first anti-reflection coating layer 10 or second anti-reflection coating layer 30 includes water-based polyester, acrylic resin, curing agent, refractive index adjusting particles, leveling agent, and defoaming agent.
According to an embodiment of the invention, first antireflective coating 10 or second antireflective coating 30 comprises: 10-50 parts by weight of water-based polyester, preferably 15-45 parts by weight; 40-90 parts by weight of acrylic resin, preferably 45-70 parts by weight; 0.1-3 parts by weight of a curing agent; 0.01 to 5 parts by weight of refractive index-adjusting particles, preferably 0.1 to 3 parts by weight; 0.01-0.5 parts by weight of a leveling agent; 0.01 to 0.5 parts by weight of a defoaming agent.
According to the embodiment of the invention, in order to improve wettability and bonding strength between first anti-reflection coating layer 10 or second anti-reflection coating layer 30 and substrate layer 20, and simultaneously not affect the effect of other anti-reflection components in the anti-reflection coating layer, the content of the water-based polyester is 10-50 parts by weight, and preferably 15-45 parts by weight.
According to the embodiment of the invention, the acrylic resin has a lower refractive index than that of the substrate layer 20, the acrylic resin is coated on the surface of the substrate layer 20 to reduce the reflectivity, and the acrylic resin can be used as the main part of the first anti-reflection coating layer 10 or the second anti-reflection coating layer 30 to perform anti-reflection modification on the substrate layer 20, wherein the acrylic resin content is 40-90 parts by weight, and preferably 45-70 parts by weight. When the acrylic resin content in first anti-reflection coating 10 or second anti-reflection coating 30 is less than 40 parts by weight, the acrylic resin cannot effectively reduce the refractive index of the anti-reflection coating, so that the effect of making the base layer anti-reflection cannot be achieved; when the acrylic resin content in first anti-reflection coating layer 10 or second anti-reflection coating layer 30 is greater than 90 parts by weight, a large-scale separation phase is generated between the acrylic resin and the water-based polyester during curing, the haze of the film is increased sharply, and the light transmittance is reduced.
According to the embodiment of the invention, refractive index adjusting particles are uniformly added in first anti-reflection coating layer 10 and second anti-reflection coating layer 30, so that the uniformity of the light transmittance of the polyester film in each wavelength band can be adjusted, and the yellowing phenomenon of the polyester film caused by large difference of the light transmittance at each wavelength can be reduced.
According to an embodiment of the present invention, the refractive index adjusting particles are particles having a higher refractive index, i.e. particles having a refractive index greater than 1.6, and the refractive index adjusting particles include one or more of zirconia, magnesia, alumina, titania, ammonium chloride, zinc oxide, barium sulfide, titan acid, chromic oxide, copper oxide, ferric oxide, and ferrous oxide.
According to the embodiment of the present invention, the size of the refractive index adjusting particles is 10 to 200nm, preferably 30 to 100nm, for example, 10nm, 30nm, 50nm, 100nm, 200 nm.
According to an embodiment of the present invention, refractive index adjusting particles are included in first antireflection coating 10 or second antireflection coating 30 in an amount of 0.01 to 5 parts by weight, preferably 0.1 to 3 parts by weight. When the amount of the refractive index adjusting particles added is too small, a sufficient refractive index adjusting effect cannot be provided, and when the amount of the additive is too high, dispersion unevenness in the antireflection coating is caused, not only is haze increased, but also unevenness in light transmittance at each wavelength section and the like at the plane of the film are caused.
According to the embodiment of the invention, the size of crystal grains in the film is designed, the refractive index adjusting particles are uniformly dispersed, the wavelength distribution of the transmitted light is adjusted by utilizing the difference of the refractive index of the dispersed refractive index adjusting particles to the light, so that the transmitted light has higher uniformity in the visible wavelength range, namely, the light transmittance is weaker in dispersion along with the wavelength, the yellowing degree of the film is reduced, the film is more transparent, and the film can be used as a base film of an optical film in liquid crystal display or organic light emitting display.
According to the embodiment of the invention, the first anti-reflection coating layer 10 or the second anti-reflection coating layer 30 comprises 0.01-0.5 part by weight of leveling agent and 0.01-0.5 part by weight of defoaming agent. The leveling agent and the defoaming agent are used for reducing the risks of bubbles, uneven spreading and the like which may occur in the anti-reflection coating liquid and the coating process.
According to the embodiment of the invention, the leveling agent can be selected from one or more of commercial brands such as BYK333, BYK3510, BYK358 and BYK 380.
According to the embodiment of the invention, the defoaming agent is selected by comprehensively considering defoaming effect and compatibility with a main solution, and can be selected from one or more of the trade marks of 901W, 2410AC, 352, 3055 and BYK 011.
According to the embodiment of the invention, in order to realize more excellent antireflection effect on base layer 20, first antireflection coating 10 or second antireflection coating 30 has a thickness of 10 to 300nm, preferably 50 to 180nm, for example, 10nm, 50nm, 100nm, 180nm, or 300 nm.
Based on the polyester film for optical display, the invention also provides a preparation method of the polyester film.
FIG. 2 is a flow chart of a method for preparing a polyester film for optical display according to an embodiment of the present invention.
As shown in fig. 2, the preparation method comprises: steps S10 to S30.
In step S10, a base layer 20 is prepared.
According to an embodiment of the present invention, preparing a substrate layer 20 includes: carrying out melt extrusion and tape casting on polyester resin to obtain a tape casting sheet; carrying out primary longitudinal stretching on the casting sheet to obtain a first stretched polyester film; performing a relaxation process on the first stretched polyester film; performing secondary transverse stretching on the first stretched polyester film to obtain a second stretched polyester film; the second stretched polyester film is heat-treated to obtain the base layer 20.
According to the embodiment of the invention, the first stretching ratio of the first longitudinal stretching is less than or equal to 4; and/or
The treatment amount of the relaxation treatment is 0.1 to 10 percent; and/or
The second stretching ratio of the second transverse stretching is 3-6.
According to an embodiment of the present invention, a process of melt extrusion casting a polyester resin to obtain a cast sheet comprises: fully drying a polyester resin raw material, and then feeding the polyester resin raw material into an extruder, taking a three-section single-screw extruder as an example, wherein the processing temperature of each section is as follows: the conveying section is at 150-240 deg.C, the compression section is at 250-280 deg.C, and the metering end is at 260-280 deg.C. The temperature of each section such as a melt pipe, a film head and the like is not lower than that of the previous section.
According to an embodiment of the present invention, a first longitudinal drawing of the cast sheet is performed to obtain a first drawn polyester film.
According to an embodiment of the present invention, the first longitudinal stretching direction is along the film casting wind-up direction, i.e., the longitudinal direction (machine traveling direction).
According to an embodiment of the present invention, the first stretching temperature of the first longitudinal stretching is not particularly limited herein as long as the cast sheet can be oriented by stretching, that is, the molecular chain direction in the cast sheet is aligned along the stretching direction.
According to the embodiment of the present invention, the first stretching temperature of the first longitudinal stretching is preferably higher than the glass transition temperature (Tg) of the cast sheet, because it is considered that the cast sheet is in a high elastic physical state and is more easily deformed after being slightly higher than Tg. Wherein the Tg of the cast sheet can be obtained using differential scanning calorimetry.
According to an embodiment of the present invention, the first draw ratio at the first longitudinal draw is provided to ensure that no draw-induced crystallization occurs after the first draw, i.e., the chains are oriented but not crystallized after the first longitudinal draw. Since the crystallization of the polymer depends not only on the stretching ratio but also on the stretching temperature, the stretching ratio can be selected by taking the influence of the temperature into consideration, and for example, the first stretching temperature may be 90 ℃ and the first stretching ratio may be 1.1 to 3.0.
According to the embodiment of the present invention, the first stretching ratio of the first longitudinal stretching is ≦ 4. The film may be stretched to a fixed stretch ratio for the first machine direction stretch in a discontinuous manner, for example, a stretch ratio of 3 may be required for the first machine direction stretch, the film may be continuously stretched even by a certain stretch factor of 3, or the film may be stretched in two or more stretches, each of which is 3 in sum relative to the stretch ratio when the film is unstretched.
According to an embodiment of the present invention, the first stretched polyester film is subjected to a relaxation treatment. In order to obtain small-sized and uniformly distributed grains, a relaxation treatment process is provided after the first longitudinal stretching. Specifically, the casting sheet after the first longitudinal stretching is relaxed by 0.1 to 10% in the stretching direction of the first longitudinal stretching, and when the relaxation treatment is less than 0.1%, the effect of controlling the grain size cannot be achieved, and when the relaxation exceeds 10%, wrinkling occurs in the film production, which affects the use. The amount of relaxation treatment is preferably 0.5 to 15%.
According to an embodiment of the invention, the relaxation temperature is set between Tg +30 ℃ and Tg +90 ℃. When the temperature is lower than the relaxation temperature, sufficient energy cannot be supplied for relaxation, and the relaxation effect cannot be achieved, and when the temperature is higher than the relaxation temperature, the grain size becomes large.
According to an embodiment of the present invention, the first stretched polyester film is subjected to the second transverse stretching to obtain the second stretched polyester film.
The second transverse stretching can endow the film with higher crystallinity and better thermal and mechanical properties and the like. The stretching direction is preferably perpendicular to the first stretching direction, so that better mechanical properties in different directions can be obtained. The stretching temperature of the second transverse stretching is in principle not subject to any restrictions, provided that it is ensured that the film is deformed uniformly under the action of external forces. From the viewpoint of improving the crystallinity and the magnitude of external force required for stretching, it is preferable to stretch the film 3 to 6 times at a second stretching temperature of Tg +30 ℃ to Tg +60 ℃.
According to an embodiment of the present invention, the second stretched polyester film is heat-treated to obtain the base layer 20. For the purpose of dimensional stability of the cured base layer 20, the heat treatment temperature is Tg +120 to Tg +180 ℃, Tg being the glass transition temperature of the polyester resin.
In step S20, an antireflective coating liquid is prepared.
According to the embodiment of the invention, the preparation of the anti-reflection coating liquid comprises the following steps: stirring and mixing 10-50 parts by weight of water-based polyester, 40-90 parts by weight of acrylic resin, 0.1-3 parts by weight of curing agent, 0.01-5 parts by weight of refractive index adjusting particles, 0.01-0.5 part by weight of flatting agent and 0.01-0.5 part by weight of defoaming agent, and then carrying out ultrasonic treatment to obtain the anti-reflection coating liquid.
In step S30, an antireflective coating solution is coated on both sides of the substrate 10 layer and thermally cured to obtain a polyester film 100.
According to the embodiment of the invention, after the anti-reflection coating liquid is coated on one side of the base layer 20, drying and curing are performed, then the anti-reflection coating liquid is coated on the other side, and drying and curing are performed, so that the polyester film with the anti-reflection coating layers on the two sides of the base layer is finally obtained. In addition, the two sides of the basal layer can be uniformly dried and solidified after being coated with anti-reflection coating liquid in sequence.
According to the embodiment of the invention, the anti-reflection coating liquid can be used for production online coating.
In the embodiment of the invention, the first anti-reflection coating layer and the second anti-reflection coating layer are formed by coating the anti-reflection coating layers on the two sides of the substrate layer, and the reflectivity is reduced by utilizing the coherent cancellation of the reflected light of the incident light at different interfaces, so that the light transmittance of the substrate layer film is improved.
According to the embodiment of the invention, the size of crystal grains in the film is designed, the refractive index adjusting particles are uniformly dispersed, the wavelength distribution of the transmitted light is adjusted by utilizing the difference of the refractive index of the dispersed refractive index adjusting particles to the light, so that the transmitted light has higher uniformity in the visible wavelength range, namely, the light transmittance is weaker in dispersion along with the wavelength, the yellowing degree of the film is reduced, the film is more transparent, and the film can be used as a base film of an optical film in liquid crystal display or organic light emitting display.
In order to more clearly illustrate the features of the present invention, examples of the present invention will be further described with reference to an example of a polyester film for optical display.
Example 1
Base layer 1
Drying polyethylene terephthalate (PET) slices with the intrinsic viscosity of 0.67dl/g at 160 ℃ to enable the water content to be less than 70ppm, putting the slices into a single-screw extruder, setting the temperature of a feeding section to be 265 ℃, the temperature of a compression section to be 275 ℃, the temperature of a homogenizing section to be 275 ℃, the temperature of a mouth mold to be 275 ℃, and adjusting the rotating speed of a screw and the rotating speed of a metering pump to enable the pressure after the pump to be stabilized at 1.2 MPa. And (3) pressing the melt flowing out of the neck mold on a cooling roller in an electrostatic adhesion mode for quenching, wherein the temperature of the cooling roller is constant at 30 ℃, and preparing amorphous casting sheets with different thicknesses by adjusting extrusion amount.
With the above cast sheet, the cast sheet was stretched 2.5 times at 103 ℃ in the first longitudinal stretching at a first stretching temperature of 103 ℃ followed by 5.5 times relaxation at 120 ℃ and then stretched 4.6 times at 105 ℃ in the second transverse stretching at a second stretching temperature of 105 ℃ followed by heat treatment at 245 ℃ to obtain a base layer 1, and the thickness, crystal grain size and in-plane birefringence of the base layer 1 were measured and filled in table 16.
The cast sheet was stretched 2.8 times at the first longitudinal stretching and 4.3 times at the second transverse stretching, the other being the same as in the preparation of the substrate layer 1, to obtain a substrate layer 2, and the thickness, crystal grain size and in-plane birefringence of the substrate layer 2 were measured and filled in table 16.
Base layer 3
The cast sheet was stretched 1.3 times at the first longitudinal stretching and 4.5 times at the second transverse stretching, heat-treated at 238 c, and the same as in the preparation of the substrate layer 1, to obtain a substrate layer 3, and the thickness, crystal grain size and in-plane birefringence of the substrate layer 3 were measured and filled in the surface 16.
Base layer 4
The stretching temperature at the time of the first longitudinal stretching was adjusted to 85 ℃, the stretching was 5.2 times at the time of the second transverse stretching, heat treatment was performed at 240 ℃, the same as in the preparation of the substrate layer 1, to obtain a substrate layer 4, and the thickness, the crystal grain size, and the in-plane birefringence of the substrate layer 4 were measured and filled in table 16.
Base layer 5
The cast sheet was stretched 1.2 times at 60 ℃ in the first machine direction stretching and 4.1 times in the second transverse direction stretching, which were otherwise the same as in the preparation of the substrate layer 1, to obtain a substrate layer 5, and the thickness, crystal grain size and in-plane birefringence of the substrate layer 5 were measured and filled in the table 16.
Base layer 6
After the first longitudinal stretching, it was then relaxed by 0.4%, stretched 5.4 times at 110 ℃ and otherwise the same as in the preparation of the substrate layer 1, to obtain a substrate layer 6, and the thickness, grain size and in-plane birefringence of the substrate layer 6 were measured and filled in table 16.
Base layer 7
The relaxation treatment amount was adjusted to 16%, the heat treatment temperature was adjusted to 250 ℃, the other procedures were the same as those for the preparation of the base layer 1, to obtain a base layer 7, and the thickness, the crystal grain size and the in-plane birefringence of the base layer 7 were measured and filled in table 16.
The temperature of the relaxation treatment was adjusted to 100 ℃ and the other steps were the same as in the preparation of the substrate layer 1 to obtain a substrate layer 8, and the thickness, crystal grain size and in-plane birefringence of the substrate layer 8 were measured and filled in table 16.
Base layer 9
In the first longitudinal stretching, the cast sheet was stretched 2.7 times at 90 ℃ and relaxed 1.5% at 130 ℃ in the same manner as in the preparation of the base layer 1 to obtain a base layer 9, and the thickness, crystal grain size and in-plane birefringence of the base layer 9 were measured and filled in table 16.
In the first longitudinal stretching, the cast sheet was stretched 1.9 times at 86 ℃, relaxed 1.5% at 130 ℃, heat-treated at 245 ℃ and otherwise the same as in the preparation of the base layer 1 to obtain a base layer 10, and the thickness, crystal grain size and in-plane birefringence of the base layer 10 were measured and filled in the table 16.
Base layer 11
The second stretching temperature of the second transverse stretching was adjusted to 115 ℃, the other was the same as the preparation of the substrate layer 1, to obtain a substrate layer 11, and the thickness, the crystal grain size, and the in-plane birefringence of the substrate layer 11 were measured and filled in table 16.
The temperature of the relaxation treatment was adjusted to 135 ℃, the other steps were the same as the preparation of the base layer 1, to obtain a base layer 12, and the thickness, the crystal grain size, and the in-plane birefringence of the base layer 12 were measured and filled in table 16.
Base layer 13
The cast sheet was stretched 3 times in the first longitudinal stretching, the second stretching temperature of the second transverse stretching was adjusted to 120 ℃, the other is the same as in the preparation of the substrate layer 1, to obtain a substrate layer 13, and the thickness, crystal grain size and in-plane birefringence of the substrate layer 13 were measured and filled in table 16.
The polyester resin raw material was changed to polyethylene naphthalate, the first stretching temperature of the first longitudinal stretching was adjusted to 110 ℃, the temperature of the relaxation treatment was adjusted to 130 ℃, the other steps were the same as the preparation of the base layer 1, to obtain a base layer 14, and the thickness, the crystal grain size, and the in-plane birefringence of the base layer 14 were measured and filled in the surface 16.
Comparative substrate layer 1
A comparative substrate layer 1 was obtained without relaxation treatment after the first longitudinal stretching, otherwise the same as the preparation of the substrate layer 1, and the thickness, grain size and in-plane birefringence of the comparative substrate layer 1 were measured and filled in table 16.
Relaxation after the first longitudinal stretch of 0.1% other than the same as for the preparation of substrate layer 1, a comparative substrate layer 2 was obtained and the thickness, grain size and in-plane birefringence of comparative substrate layer 2 were tested and filled in table 16.
Contrast substrate layer 3
The temperature of the relaxation treatment was adjusted to 230 c, the other being the same as the preparation of the substrate layer 1, to obtain a comparative substrate layer 3, and the thickness, the crystal grain size and the in-plane birefringence of the comparative substrate layer 3 were measured and filled in table 16.
Contrast substrate layer 4
The temperature of the relaxation treatment was adjusted to 60 c, the other being the same as in the preparation of the substrate layer 1, to obtain a comparative substrate layer 4, and the thickness, crystal grain size and in-plane birefringence of the comparative substrate layer 4 were measured and filled in table 16.
Contrast substrate layer 5
The cast sheet was stretched 1 times in the first machine direction stretch otherwise the same as for the preparation of substrate layer 1 to give comparative substrate layer 5, and the thickness, grain size and in-plane birefringence of comparative substrate layer 5 were measured and filled in table 16.
Contrast substrate layer 6
The cast sheet was stretched 3.4 times in the first longitudinal stretching and 3.5 times in the second transverse stretching, otherwise the same as in the preparation of the substrate layer 1, to give a comparative substrate layer 6, and the thickness, grain size and in-plane birefringence of the comparative substrate layer 6 were measured and filled in table 16.
Anti-reflection coating liquid 1
194.2 parts by weight of dimethyl terephthalate, 29.6 parts by weight of sodium m-benzenedimethyl-5-sulfonate, 3.8 parts by weight of propylene glycol, 0.3 part by weight of tetrabutyl titanate, 62 parts by weight of ethylene glycol and 106 parts by weight of diethylene glycol were added to an autoclave, stirring was started at 160 ℃, and then the temperature was gradually raised to 240 ℃ within the following 5 hours, and the transesterification reaction was fully completed. Then gradually reducing the pressure to 60Pa, and reacting for 1.5-2 h at 235-245 ℃ to obtain the water-based polyester. And dispersing a certain amount of the prepared polyester in deionized water to prepare liquid with the solid content of 30% for later use.
Taking 18 parts by weight of acrylic acid, 18 parts by weight of hydroxyethyl acrylate, 88 parts by weight of methyl methacrylate, 176 parts by weight of n-butyl acrylate and 3 parts by weight of azobisisobutyronitrile to prepare a mixed monomer solution, adding 1/4 parts of mixed monomer into a three-neck flask filled with 118 parts by weight of isopropanol, heating and stirring, reacting at 70 ℃ for 25-35 minutes, then heating to 77 ℃, slowly dripping the residual mixed monomer solution within 2.5-3 hours, then reacting for 2-3 hours, cooling to 60 ℃, and then adding ammonia water for neutralization for 5-10 minutes to obtain the water-soluble acrylic emulsion. Taking a certain amount of the prepared water-based acrylic emulsion, and diluting the water-based acrylic emulsion by using deionized water until the solid content is 30 percent for later use.
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 1, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 1.
The term "parts by weight" refers to "dry" (non-aqueous) parts by weight of the components in each formulation, i.e., an effective part by weight, for example, 25 parts by weight of the aqueous polyester, which means an effective reagent solids content of 25 parts by weight, as a solid content equivalent.
TABLE 1 recipe of anti-reflection coating liquid 1
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 2, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 2.
TABLE 2 recipe of anti-reflection coating liquid 2
Anti-reflection coating liquid 3
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 3, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 3.
TABLE 3 recipe of anti-reflection coating liquid 3
Anti-reflection coating liquid 4
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 4, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 4.
TABLE 4 recipe of anti-reflection coating liquid 4
Anti-reflection coating liquid 5
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 5, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 5.
TABLE 5 recipe of anti-reflection coating liquid 5
Anti-reflection coating liquid 6
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 6, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 6.
TABLE 6 recipe of anti-reflection coating liquid 6
Anti-reflection coating liquid 7
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 7, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 7.
TABLE 7 recipe of anti-reflection coating liquid 7
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 8, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 8.
TABLE 8 recipe of anti-reflection coating liquid 8
Anti-reflection coating liquid 9
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 9, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 9.
TABLE 9 recipe of anti-reflection coating liquid 9
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 10, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the anti-reflection coating liquid 10.
TABLE 10 recipe of anti-reflection coating liquid 10
Contrast anti-reflection coating liquid 1
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 11, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain a contrast anti-reflection coating liquid 1.
TABLE 11 COMPARATIVE ANTI-REFLECTIVE COATING LIQUID 1 FORMULATION
Contrast anti-reflection coating liquid 2
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in Table 12, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain a contrast anti-reflection coating liquid 2.
TABLE 12 comparative anti-reflection coating liquid 2 recipe
Contrast anti-reflection coating liquid 3
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in Table 13, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain a contrast anti-reflection coating liquid 3.
TABLE 13 comparative anti-reflection coating liquid 3 formulation
Contrast anti-reflection coating liquid 4
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 14, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain a contrast anti-reflection coating liquid 4.
TABLE 14 comparative anti-reflection coating liquid 4 recipe
Contrast anti-reflection coating liquid 5
The components are added into a container with a stirrer according to the proportion of parts at 25 ℃ according to the formula shown in the table 15, and the mixture is stirred for 2 hours at the rotating speed of 400r/min to obtain the contrast anti-reflection coating liquid 5.
TABLE 15 COMPARATIVE ANTI-REFLECTIVE COATING LIQUID 5 FORMULATION
Polyester film 1
Antireflection coating liquid 1 was applied to both sides of substrate layer 1, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer became 120nm, to obtain polyester film 1, which was measured for transmittance spectrum, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 3
Antireflection coating liquid 3 was applied to both sides of substrate layer 1, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer became 100nm to obtain polyester film 1, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 4
Antireflection coating liquid 4 was applied to both sides of base layer 2, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the dried coating thickness became 200nm to obtain polyester film 1, which was subjected to transmission spectrum measurement, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 5
Antireflection coating liquid 5 was applied to both sides of base layer 3, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the dried coating thickness became 30nm to obtain polyester film 1, which was subjected to transmission spectrum measurement, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 6
Antireflection coating liquid 6 was applied to both sides of base layer 4, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the dried coating thickness became 100nm to obtain polyester film 1, which was subjected to transmission spectrum measurement, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 7
Antireflection coating liquid 7 was applied to both sides of substrate layer 5, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the dried coating thickness became 100nm to obtain polyester film 1, which was subjected to transmission spectrum measurement, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 9
Antireflection coating liquid 9 was applied to both sides of the substrate layer 7, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer became 120nm to obtain a polyester film 1, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 11
Antireflection coating liquid 1 was applied to both sides of substrate layer 9, which was then cured at 150 ℃ for 2 minutes, with the amount of application controlled so that the thickness of the dried coating was 120nm, to obtain polyester film 1, which was subjected to transmission spectrum measurement, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 13
Antireflection coating liquid 3 was applied to both sides of base layer 11, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer became 120nm to obtain polyester film 1, which was measured for transmittance spectrum, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Antireflection coating liquid 4 was applied to both sides of base layer 12, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer became 120nm, to obtain polyester film 1, which was measured for transmittance spectrum, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 15
Antireflection coating liquid 5 was applied to both sides of base layer 13, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the dried coating thickness became 120nm to obtain polyester film 1, which was measured for transmittance spectrum, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Antireflection coating liquid 6 was applied to both sides of base layer 14, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer became 120nm, to obtain polyester film 1, which was measured for transmittance spectrum, counted T (1), T (1)/T (2) and T (2)/T (3) and filled in Table 17.
Polyester film 17
Antireflection coating liquid 1 was applied to both sides of comparative substrate layer 1, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer became 120nm to obtain polyester film 1, which was measured for transmittance spectrum, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in table 17.
Antireflection coating liquid 1 was applied to both sides of comparative substrate layer 2, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the dried coating thickness became 120nm to obtain polyester film 1, which was measured for transmittance spectrum, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in table 17.
Polyester film 19
Antireflection coating liquid 1 was applied to both sides of comparative substrate layer 3, and then cured at 150 ℃ for 2 minutes, the application amount was controlled so that the thickness of the dried coating layer became 120nm, and polyester film 1 was obtained, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Antireflection coating liquid 1 was applied to both sides of comparative base layer 4, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the dried coating thickness became 120nm to obtain polyester film 1, which was measured for transmittance spectrum, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 21
Antireflection coating liquid 1 was applied to both sides of comparative substrate layer 5, which was then cured at 150 ℃ for 2 minutes, the amount of application was controlled so that the thickness of the dried coating was 120nm, and polyester film 1 was obtained, the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 22
Antireflection coating liquid 1 was applied to both sides of comparative base layer 6, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the dried coating thickness became 120nm to obtain polyester film 1, which was measured for transmittance spectrum, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 23
The comparative anti-reflection coating liquid 1 was applied to both sides of the substrate layer 1, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer became 120nm to obtain a polyester film 1, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 24
The comparative anti-reflection coating liquid 2 was applied to both sides of the substrate layer 1, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer became 120nm to obtain a polyester film 1, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 25
The comparative anti-reflection coating liquid 3 was applied to both sides of the substrate layer 1, and then cured at 150 ℃ for 2 minutes, the amount of application was controlled so that the thickness of the dried coating layer became 120nm, and the polyester film 1 was obtained, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 26
The comparative anti-reflection coating liquid 4 was applied to both sides of the substrate layer 1, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer was 120nm to obtain a polyester film 1, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 27
A comparative anti-reflection coating liquid 5 was applied to both sides of the substrate layer 1, and then cured at 150 ℃ for 2 minutes, the application amount was controlled so that the thickness of the dried coating layer became 120nm, and a polyester film 1 was obtained, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
A comparative anti-reflection coating liquid 1 was applied to one side of a substrate layer 1, and then cured at 150 ℃ for 2 minutes with the amount of application controlled so that the thickness of the dried coating layer became 120nm to obtain a polyester film 1, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
Polyester film 29
The comparative anti-reflection coating liquid 1 was applied to both sides of the substrate layer 1, and then cured at 150 ℃ for 2 minutes with the coating amount controlled so that the thickness of the dried coating layer was 260nm to obtain a polyester film 1, and the transmission spectrum thereof was measured, and T (1), T (1)/T (2) and T (2)/T (3) were counted and filled in Table 17.
The thickness of the prepared polyester film was measured, wherein the film thickness was obtained using a micrometer test (hotte GL 25); the crystallinity and the grain size are obtained by statistics after the X-ray wide angle diffraction (WAXD) test with the wavelength of 0.154nm by the method; the in-plane birefringence was measured by a phase difference meter (RETS-100L); t (1), T (2) and T (3) can be obtained by testing an ultraviolet-visible spectrophotometer, and T (1)/T (2) and T (2)/T (2) can be obtained by light transmittance statistics at each wavelength.
FIG. 3 is a graph showing a distribution of transmittance with wavelength of a polyester film for optical display according to an embodiment of the present invention at a wavelength of 400nm to 800 nm.
As shown in FIG. 3, the transmittance of the polyester film prepared in the example of the present invention is greater than 90% at wavelengths of 400nm to 800 nm.
Fig. 4 is a wavelength distribution diagram of surface reflectance of the substrate layer without the anti-reflection coating layer and the substrate layer coated with the anti-reflection coating layer according to the embodiment of the present invention.
As shown in fig. 4, the surface reflectivity of the substrate layer coated with the anti-reflection coating layer prepared in the embodiment of the present invention is lower than the surface reflectivity of the substrate layer not coated with the anti-reflection coating layer, so that the light transmittance of the substrate layer coated with the anti-reflection coating layer prepared in the embodiment of the present invention is higher than the light transmittance of the substrate layer not coated with the anti-reflection coating layer.
The polyester film prepared in the example of the present invention was evaluated for display effect. Specifically, the prepared polyester film was cut to a size of A4, laid flat on a backlight plane constituted by a pure white LED surface light source (model: HX-MBD-002), and then observed in a front view (view directly above the film) and an oblique view (view obliquely above the film) with respect to the light passing through the polyester film. Wherein the content of the first and second substances,
very good represents almost pure white, and the whole is slightly bright;
o represents almost pure white, overall darker;
and x represents darker and yellowish.
Table 16 base layer preparation examples and associated performance tables
TABLE 17 polyester film for optical display applications and performance tables
The polyester film prepared by the embodiment of the invention has light transmittance of more than 93% at a wavelength of 550nm, namely T (2) is more than 93%, and the polyester film prepared by the embodiment of the invention has larger T (1)/T (2) and T (2)/T (3), has good display effect, and can effectively eliminate the display condition that the color of the film is yellow.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A polyester film for optical display, comprising a substrate layer,
a first anti-reflection coating and a second anti-reflection coating are arranged on two sides of the substrate layer and used for increasing the light transmittance of the substrate layer;
wherein T1/T2 is 0.92-1, T2/T3 is 0.93-1, T2 is more than or equal to 91%,
t1 is the light transmittance of the polyester film at the wavelength of 450nm, T2 is the light transmittance of the polyester film at the wavelength of 550nm, and T3 is the light transmittance of the polyester film at the wavelength of 650 nm.
2. The polyester film according to claim 1, wherein the crystal grain size of the base layer is 0.3 to 13nm, preferably 1 to 10 nm.
3. The polyester film according to claim 1, wherein the substrate layer has an in-plane birefringence of 0.03 to 0.15, preferably 0.05 to 0.13.
4. The polyester film according to claim 1,
the substrate layer comprises polyethylene terephthalate, polyethylene terephthalate and polyethylene naphthalate, or polyethylene terephthalate-1, 4-cyclohexanedimethanol ester;
the thickness of the substrate layer is 30-300 μm, preferably 50-250 μm.
5. The polyester film according to claim 1, wherein the first anti-reflection coating layer or the second anti-reflection coating layer comprises water-based polyester, acrylic resin, a curing agent, refractive index adjusting particles, a leveling agent, and a defoaming agent;
preferably, the first antireflective coating or the second antireflective coating comprises:
10-50 parts by weight of water-based polyester, preferably 15-45 parts by weight;
40-90 parts by weight of acrylic resin, preferably 45-70 parts by weight;
0.1-3 parts by weight of a curing agent;
0.01 to 5 parts by weight of refractive index-adjusting particles, preferably 0.1 to 3 parts by weight;
0.01-0.5 parts by weight of a leveling agent;
0.01 to 0.5 parts by weight of a defoaming agent.
6. The polyester film according to claim 5, wherein the refractive index adjusting particles comprise one or more of zirconia, magnesia, alumina, and titania.
7. The polyester film according to claim 1, wherein the thickness of the first anti-reflection coating layer or the second anti-reflection coating layer is 10 to 300nm, preferably 50 to 180 nm.
8. A method for producing a polyester film according to any one of claims 1 to 7, comprising:
preparing a substrate layer;
preparing anti-reflection coating liquid; and
coating the anti-reflection coating liquid on two sides of the substrate layer and performing heat curing to obtain a polyester film;
wherein the preparation of the anti-reflection coating liquid comprises the following steps:
stirring and mixing 10-50 parts by weight of water-based polyester, 40-90 parts by weight of acrylic resin, 0.1-3 parts by weight of curing agent, 0.01-5 parts by weight of refractive index adjusting particles, 0.01-0.5 part by weight of flatting agent and 0.01-0.5 part by weight of defoaming agent, and then carrying out ultrasonic treatment to obtain the anti-reflection coating liquid.
9. The method of claim 8, wherein the preparing a substrate layer comprises:
carrying out melt extrusion and tape casting on polyester resin to obtain a tape casting sheet;
carrying out primary longitudinal stretching on the casting sheet to obtain a first stretched polyester film;
performing a relaxation process on the first stretched polyester film;
performing second transverse stretching on the first stretched polyester film to obtain a second stretched polyester film;
and performing heat treatment on the second stretched polyester film to obtain the substrate layer.
10. The production method according to claim 9,
the first stretching ratio of the first longitudinal stretching is less than or equal to 4; and/or
The treatment amount of the relaxation treatment is 0.1-10%; and/or
The second stretching ratio of the second transverse stretching is 3-6;
preferably, the heat treatment temperature is Tg +120 ℃ to Tg +180 ℃, and Tg is the glass transition temperature of the polyester resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111143504.5A CN113861475B (en) | 2021-09-28 | 2021-09-28 | Polyester film for optical display and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111143504.5A CN113861475B (en) | 2021-09-28 | 2021-09-28 | Polyester film for optical display and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113861475A true CN113861475A (en) | 2021-12-31 |
| CN113861475B CN113861475B (en) | 2022-12-30 |
Family
ID=78991805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111143504.5A Active CN113861475B (en) | 2021-09-28 | 2021-09-28 | Polyester film for optical display and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113861475B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114895385A (en) * | 2022-06-29 | 2022-08-12 | 芜湖韩保光学新材料有限公司 | Optical protection film for reducing edge diffuse reflection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514275A (en) * | 2011-11-10 | 2012-06-27 | 合肥乐凯科技产业有限公司 | Optical polyester thin film and preparation method thereof |
| WO2014209056A1 (en) * | 2013-06-27 | 2014-12-31 | 코오롱인더스트리 주식회사 | Polyester film and method for manufacturing same |
| CN104513403A (en) * | 2014-12-19 | 2015-04-15 | 佛山杜邦鸿基薄膜有限公司 | BOPET film with water-based anti-reflection coating coated online and preparation method of BOPET film |
| JP2016525465A (en) * | 2013-06-27 | 2016-08-25 | コーロン インダストリーズ インク | Polyester film and method for producing the same |
| CN109232867A (en) * | 2017-05-16 | 2019-01-18 | 中国石化仪征化纤有限责任公司 | A kind of aqueous copolyesters and preparation method thereof |
-
2021
- 2021-09-28 CN CN202111143504.5A patent/CN113861475B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514275A (en) * | 2011-11-10 | 2012-06-27 | 合肥乐凯科技产业有限公司 | Optical polyester thin film and preparation method thereof |
| WO2014209056A1 (en) * | 2013-06-27 | 2014-12-31 | 코오롱인더스트리 주식회사 | Polyester film and method for manufacturing same |
| JP2016525465A (en) * | 2013-06-27 | 2016-08-25 | コーロン インダストリーズ インク | Polyester film and method for producing the same |
| CN104513403A (en) * | 2014-12-19 | 2015-04-15 | 佛山杜邦鸿基薄膜有限公司 | BOPET film with water-based anti-reflection coating coated online and preparation method of BOPET film |
| CN109232867A (en) * | 2017-05-16 | 2019-01-18 | 中国石化仪征化纤有限责任公司 | A kind of aqueous copolyesters and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114895385A (en) * | 2022-06-29 | 2022-08-12 | 芜湖韩保光学新材料有限公司 | Optical protection film for reducing edge diffuse reflection |
| CN114895385B (en) * | 2022-06-29 | 2023-10-31 | 芜湖韩保光学新材料有限公司 | Optical protection film for reducing diffuse reflection at edge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113861475B (en) | 2022-12-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103926637B (en) | Optical laminate, polarizing film, image display device, the manufacturing method of image display device and image display device visibility ameliorative way | |
| US9081133B2 (en) | Polarizing plate protective film, polarizing plate, and liquid crystal display | |
| CN108773141B (en) | Polyester reflecting film and preparation method and application thereof | |
| CN100588991C (en) | Optical film, producing method therefor, polarizing plate and image display apparatus | |
| CN103386793A (en) | Reflection film and preparation method thereof | |
| CN113614592B (en) | Circular polarizing plate for anti-reflection and image display device using the same | |
| CN112485946B (en) | Reflecting film for thin direct type liquid crystal display device and preparation method thereof | |
| CN102109144B (en) | Lower diffusion sheet in backlight module and manufacturing method thereof | |
| CN113861475B (en) | Polyester film for optical display and preparation method thereof | |
| CN103796824B (en) | Texture film and manufacture method | |
| CN114889268A (en) | Quantum dot light diffusion plate and preparation method and application thereof | |
| JP2008195803A (en) | Optical polyester film | |
| JP2008195805A (en) | Optical polyester film | |
| CN113061273B (en) | Preparation method of high-performance polaroid | |
| JP2008195804A (en) | Optical polyester film | |
| CN113093323A (en) | PMMA/PC-based high-performance polarizer | |
| CN114555327A (en) | Melt-extrusion type polarizing film | |
| CN102109709B (en) | Lower diffusion sheet used in small-sized LCD backlight modules and manufacture method thereof | |
| JP2007156287A (en) | Polyester film for prism sheet | |
| KR102215047B1 (en) | Dispersion type polarizing film manufacturing equipment | |
| TWI803771B (en) | Polarizing plate laminate and display device comprising the same | |
| KR102231814B1 (en) | Polarizing film by extruding method | |
| KR102532754B1 (en) | liquid crystal display | |
| JP2012250446A (en) | Optical biaxially-stretched polyester film roll | |
| JP2010214674A (en) | Laminated polyester film for optical use |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230413 Address after: 230026 Jinzhai Road, Baohe District, Hefei, Anhui Province, No. 96 Patentee after: University of Science and Technology of China Patentee after: Li Liangbin Patentee after: Meng Lingpu Patentee after: Zhang Wenwen Patentee after: Chen Wei Address before: 230026 Jinzhai Road, Baohe District, Hefei, Anhui Province, No. 96 Patentee before: University of Science and Technology of China |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231020 Address after: Room 204-A5, Embedded R&D Building, No. 5089 Wangjiang West Road, High tech Zone, Hefei City, Anhui Province, 230094 Patentee after: Hefei Zhongke Youcai Technology Co.,Ltd. Address before: 230029 National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui Province Patentee before: Li Liangbin Patentee before: Meng Lingpu Patentee before: Zhang Wenwen Patentee before: Chen Wei Effective date of registration: 20231020 Address after: 230029 National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui Province Patentee after: Li Liangbin Patentee after: Meng Lingpu Patentee after: Zhang Wenwen Patentee after: Chen Wei Address before: 230026 Jinzhai Road, Baohe District, Hefei, Anhui Province, No. 96 Patentee before: University of Science and Technology of China Patentee before: Li Liangbin Patentee before: Meng Lingpu Patentee before: Zhang Wenwen Patentee before: Chen Wei |