CN112694845A - Screen protection film and preparation method thereof - Google Patents
Screen protection film and preparation method thereof Download PDFInfo
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- CN112694845A CN112694845A CN202011556685.XA CN202011556685A CN112694845A CN 112694845 A CN112694845 A CN 112694845A CN 202011556685 A CN202011556685 A CN 202011556685A CN 112694845 A CN112694845 A CN 112694845A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/255—Polyesters
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- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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- 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
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- 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
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
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- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
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- 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
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K2003/2241—Titanium dioxide
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Abstract
The invention provides a screen protective film and a preparation method thereof, and relates to the technical field of display materials. The substrate layer of the screen protective film is a polyester film having a retardation of 5000nm to 20000nm, and since the polyester film has different refractive indices in different moving directions, width directions and thickness directions, when viewed obliquely, concentric rainbow unevenness may occur, which may affect the viewing effect. The retardation of the polyester film is controlled to be 5000-20000 nm, so that the in-plane birefringence of the polyester film is increased, the retardation change based on the observation angle is weakened, obvious rainbow patterns cannot be observed in the observation angle, and the rainbow patterns of the polyester film substrate are effectively reduced.
Description
Technical Field
The invention relates to the technical field of display materials, in particular to a screen protective film and a preparation method thereof.
Background
In recent years, the display technology has been rapidly developed, and on one hand, the size of the display screen is gradually increased, and the display definition is also obviously improved. From earlier lower resolutions to 480P resolutions, then to 720P resolutions, then to 1080P resolutions, or even today 4K or even 8K resolutions. With the improvement of display technology, the requirements of people on display effect are gradually improved.
The screen protection film is attached to the surface of display equipment such as a mobile phone and a flat panel, and plays a role in protecting a screen. However, the screen protection film has a certain influence on the display effect due to the difference in optical properties between the screen protection film and the original display screen. Therefore, in order to realize the quality and effect of the display screen, the screen protection film is required to have high definition and low rainbow patterns.
At present, the main material of the screen protection film is PET. Through a biaxial stretching process, molecular chains of the semicrystalline BOPET film are oriented in different directions to generate a rainbow pattern phenomenon, so that the light transmittance is reduced to influence the display effect.
Therefore, it is necessary and urgent to develop a screen protective film having a low rainbow effect to alleviate the problem of the decrease in light transmittance due to the rainbow pattern phenomenon of the conventional screen protective film.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
A first object of the present invention is to provide a screen protective film which increases in-plane birefringence of a polyester film by controlling a retardation of the polyester film to 5000nm to 20000nm, reduces a retardation change depending on an observation angle, prevents a noticeable rainbow pattern from being observed within the observation angle, and effectively reduces the rainbow pattern phenomenon of a polyester film substrate itself.
The second purpose of the invention is to provide a preparation method of the screen protection film.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a screen protection film, which comprises a base material layer, wherein the base material layer comprises a polyester film with the retardation of 5000-20000 nm.
Further, the screen protection film further comprises a hardening layer, a pressure-sensitive silica gel layer and a release protective layer.
Further, the pressure-sensitive silica gel layer is compounded on the release protective layer;
the base material layer is compounded on the pressure-sensitive silica gel layer;
the hardening layer is compounded on the base material layer.
Further, the substrate layer is mainly prepared from polyethylene terephthalate and/or polyethylene naphthalate;
preferably, the substrate layer is made of polyethylene terephthalate;
preferably, the light transmittance of the substrate layer is 88-92%, and the haze is 0.2-3.0%.
Further, the hardening coating liquid of the hardening layer is mainly prepared from a coating and high-refraction nano particles;
preferably, the coating comprises at least one of an aqueous polyurethane, an acrylate, and an epoxy polyester;
preferably, the high refractive nanoparticles comprise at least one of zirconium dioxide, aluminum oxide, titanium dioxide, zinc oxide and antimony oxide;
preferably, the refractive index of the hardened layer is 1.40-1.58, and the hardness is 2H-3H.
Further, the silica gel coating liquid of the pressure-sensitive silica gel layer is mainly prepared from organopolysiloxane, a silane coupling agent, organohydrogenpolysiloxane and a platinum complex catalyst;
preferably, the light transmittance of the pressure-sensitive silica gel layer is 85% -93%, and the haze is 0.2% -3.0%.
Further, the release protection layer comprises one of PET, PC, PMMA and COP;
preferably, the thermal shrinkage rate of the release protection layer is 0-1% at 150 ℃.
Further, the thickness of the hardening layer is 500 nm-5 μm;
the thickness of the substrate layer is 40-188 micrometers;
the thickness of the pressure-sensitive silica gel layer is 10-40 μm;
the thickness of the release protection layer is 30-100 mu m.
The invention provides a preparation method of the screen protection film, which comprises the following steps:
providing a polyester film with the retardation of 5000 nm-20000 nm as a substrate layer, coating the hardening coating liquid on the substrate layer, and forming a hardening layer through crosslinking and thermosetting; then coating the silica gel coating liquid on the lower part of the substrate layer and curing to form a pressure-sensitive silica gel layer; and then, the release protective layer is attached to the lower part of the pressure-sensitive silica gel layer to prepare the screen protective film.
Further, the temperature for crosslinking and thermosetting the hardened coating liquid is 80-110 ℃;
preferably, the curing temperature of the silica gel coating liquid is 80-110 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a screen protection film, wherein a substrate layer of the screen protection film is a polyester film with the retardation of 5000 nm-20000 nm, and the polyester film has different refractive indexes along the moving direction, the width direction and the thickness direction, so that concentric rainbow-like speckles can be generated when the screen protection film is observed obliquely, and the observation effect is influenced. The retardation of the polyester film is controlled to be 5000-20000 nm, so that the in-plane birefringence of the polyester film is increased, the retardation change based on the observation angle is weakened, obvious rainbow patterns cannot be observed in the observation angle, and the rainbow patterns of the polyester film substrate are effectively reduced.
The preparation method of the screen protection film provided by the invention comprises the steps of firstly providing a polyester film with the retardation of 5000-20000 nm as a base material layer, coating hardening coating liquid on the base material layer, and forming a hardening layer through crosslinking and thermosetting; then coating the silica gel coating liquid on the lower part of the substrate layer and curing to form a pressure-sensitive silica gel layer; and then, the release protective layer is attached to the lower part of the pressure-sensitive silica gel layer to prepare the screen protective film. The preparation method has the advantages of simple processing technology and easy operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a screen protection film provided in embodiment 1 of the present invention.
Icon: 11-a substrate layer; 12-a hardened layer; 13-a layer of pressure sensitive silica gel; 14-a release protective layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an aspect of the present invention, a screen protective film includes a base material layer 11, and the base material layer 11 includes a polyester film having a retardation amount of 5000nm to 20000 nm.
The invention provides a screen protection film, wherein a substrate layer 11 of the screen protection film is a polyester film with the retardation of 5000 nm-20000 nm, and the polyester film has different refractive indexes along the moving direction, the width direction and the thickness direction, so that concentric rainbow speckle can be generated when the screen protection film is observed obliquely, and the observation effect is influenced. The retardation of the polyester film is controlled to be 5000-20000 nm, so that the in-plane birefringence of the polyester film is increased, the retardation change based on the observation angle is weakened, obvious rainbow patterns cannot be observed in the observation angle, and the rainbow patterns of the polyester film substrate are effectively reduced.
Further, the retardation of the base material layer 11 is 5000 to 20000nm, preferably 6000 to 17000nm, and more preferably 8000 to 15000 nm.
In a preferred embodiment of the present invention, the screen protective film further includes a hardening layer 12, a pressure sensitive silicone layer 13, and a release protective layer 14.
In the above preferred embodiment, the pressure sensitive silicone layer 13 is compounded on the release protective layer 14;
the substrate layer 11 is compounded on the pressure-sensitive silica gel layer 13;
the hardened layer 12 is compounded on the substrate layer 11.
In a preferred embodiment of the present invention, the substrate layer 11 is mainly made of polyethylene terephthalate and/or polyethylene naphthalate;
in the above preferred embodiment, the substrate layer 11 is made of polyethylene terephthalate;
as a preferred embodiment, the above polyethylene terephthalate and polyethylene naphthalate each have excellent optical and mechanical properties, in which the birefringence effect inherent to polyethylene terephthalate is larger and control of retardation is more easily achieved.
In a preferred embodiment of the present invention, the upper surface and the lower surface of the substrate layer 11 are corona-treated or undercoated, so as to improve the adhesion between the optically matching cured layer 12 and the substrate layer 11 by means of corona.
In the above preferred embodiment, the substrate layer 11 has a light transmittance of 88% to 92% and a haze of 0.2% to 3.0%.
In a preferred embodiment of the present invention, a biaxially stretched polyester film is used as the substrate layer 11, and the ratio of longitudinal stretching and transverse stretching is preferably controlled so as to control the retardation within a suitable range. By increasing the difference between the longitudinal stretching magnification and the transverse stretching magnification, the retardation can be effectively improved. Specifically, the ratio of longitudinal stretching is 1.0 to 2.5 times, preferably 1.0 to 2.0 times. More preferably 1.0 to 1.5 times; the transverse stretching magnification is 3.0 to 5.0 times, preferably 3.5 to 4.5 times, and more preferably 3.8 to 4.3 times.
In a preferred embodiment of the present invention, the uniformity of the polyester film is preferably controlled in order to suppress the variation in retardation of the polyester film. The thickness unevenness of the polyester film as the substrate layer 11 according to the present invention is less than 5%, preferably less than 4%, and more preferably less than 3%. In order to achieve uniformity of the polyester film thickness, it is preferable to control the temperature at the time of longitudinal stretching and transverse stretching. Specifically, the longitudinal stretching temperature is 80-120 ℃, and preferably 90-115 ℃; the transverse stretching temperature is 100-140 ℃, and preferably 110-130 ℃.
In a preferred embodiment of the present invention, the mechanical strength of the polyester film in the machine direction is decreased after increasing the difference between the longitudinal stretching ratio and the transverse stretching ratio. In order to meet the subsequent winding and processing requirements, the longitudinal tensile modulus of the polyester film serving as the substrate layer 11 is 100-150 MPa, and the transverse tensile modulus is 200-280 MPa. The ratio of the longitudinal tensile strength to the transverse tensile strength is 0.36 to 0.75.
In a preferred embodiment of the present invention, the stretching speed of the polyester film is preferably controlled in order to improve the mechanical strength of the polyester film. Specifically, the transverse stretching speed is 300%/min to 700%/min, preferably 350%/min to 650%/min. Further, the mechanical strength of the film can also be improved by increasing the heat treatment temperature to partially crystallize the polyester film. Specifically, the continuous heat treatment temperature is 160 to 240 ℃, preferably 180 to 230 ℃.
In a preferred embodiment of the present invention, the hardening coating liquid of the hardened layer 12 is mainly made of a dope and high refractive nanoparticles;
in a preferred embodiment, the hardened coating liquid is applied to the upper surface of the substrate layer 11 to protect the substrate layer 11, thereby realizing the scratch resistance of the screen protection film. Meanwhile, the rainbow patterns deepened after the coating and hardening can be reduced by adjusting the refractive index of the hardening layer 12 to be matched with the substrate layer 11.
Specifically, known methods of applying the hardening liquid are used, including but not limited to: a reverse roll coating method, a gravure coating method, a kiss coating method, an air knife coating method, a wire rod coating method, a tube doctor blade method, and the like, and the above methods may be used alone or in combination.
In a preferred embodiment of the present invention, the coating comprises at least one of aqueous polyurethane, acrylate and epoxy polyester;
in a preferred embodiment of the present invention, the high refractive nanoparticles include at least one of zirconium dioxide, aluminum oxide, titanium dioxide, zinc oxide, and antimony oxide;
in a preferred embodiment, high refractive nanoparticles are added to the curing liquid for the cured layer 12 in order to control the refractive index of the cured layer 12 within the above range. Under the condition of not influencing the light transmission performance of the hardened layer 12, the refractive index of the hardened layer 12 can be effectively improved by adding the high-refraction nano particles.
Preferably, the particle size of the high refractive nanoparticles is 5nm to 100nm, preferably 5nm to 40nm, and the addition amount of the high refractive nanoparticles is 1% to 15%.
In a preferred embodiment of the present invention, the hardened layer 12 has a refractive index of 1.40 to 1.58 and a hardness of 2H to 3H, and the hardened layer 12 is located at the outermost layer of the screen protection film and is required to have sufficient scratch resistance.
In a preferred embodiment of the present invention, the silica gel coating liquid of the pressure-sensitive silica gel layer 13 is mainly prepared from an organopolysiloxane, a silane coupling agent, an organohydrogenpolysiloxane, and a platinum complex catalyst;
as a preferred embodiment, the pressure sensitive silica gel layer 13 is coated on the lower surface of the substrate layer 11, and the pressure sensitive silica gel layer 13 has the characteristics of quick automatic exhaust, good adsorbability, high light transmittance, long service life and the like, and can be quickly and flatly attached to the screen of the display device.
Further, the material of the pressure-sensitive silica gel layer 13 is selected from silica gel, acrylic gel, polyvinyl alcohol gel, and the like, and preferably silica gel.
Further, the raw material of the pressure-sensitive silica gel layer 13 includes, but is not limited to, organopolysiloxane, silane coupling agent, organohydrogenpolysiloxane, platinum complex catalyst. Specifically, the pressure-sensitive silica gel layer 13 used contains the following components by weight: 80-100 parts of organopolysiloxane, 0.5-1 part of silane coupling agent, 0-1.5 parts of organohydrogenpolysiloxane and 0.5-1.5 parts of platinum complex catalyst.
In a preferred embodiment of the present invention, the transmittance of the pressure sensitive silica gel layer 13 is 85% to 93%, and the haze is 0.2% to 3.0%.
In a preferred embodiment of the present invention, the bonding and tearing force of the pressure sensitive silicone layer 13 and the display device screen is greater than 15g, and the peeling force is 50-300 g.
As a preferred embodiment, in order to facilitate the installation and replacement of the low rainbow pattern screen protective film of the present invention on the screen of the display device, it is necessary to control the adhesive force of the pressure-sensitive silicone rubber layer 13 within a suitable range. If the viscosity is too low, it is difficult to ensure that the adhesive does not fall off after long-term use. If the adhesive force is too large, the screen protective film is difficult to be torn off when replaced. Particularly, the laminating of pressure sensitive silica gel layer 13 and display device screen is torn the power and is greater than 15g, and the power of peeling off is 50 ~ 300 g.
In a preferred embodiment of the present invention, the release protective layer 14 includes one of PET, PC, PMMA and COP;
as a preferred embodiment, in order to facilitate the installation of the low rainbow patterns screen protective film on the screen of the display device, the release protective layer 14 is attached to the pressure-sensitive silicone layer 13, and plays a role of keeping anti-sticking and isolation with the pressure-sensitive silicone layer 13. The release protective layer 14 has good stripping performance, and the pressure-sensitive silica gel layer 13 cannot be damaged after stripping.
Preferably, the thermal shrinkage rate of the release protection layer 14 is 0-1% at 150 ℃.
In a preferred embodiment of the present invention, the thickness of the hardened layer 12 is 500nm to 5 μm;
the thickness of the substrate layer 11 is 40-188 micrometers;
the thickness of the pressure-sensitive silica gel layer 13 is 10-40 μm;
the thickness of the release protection layer 14 is 30-100 μm.
According to an aspect of the present invention, a method of manufacturing the above-described screen protective film includes the steps of:
providing a polyester film with a retardation of 5000nm to 20000nm as a substrate layer 11, coating a hardening coating liquid on the substrate layer 11, and forming a hardened layer 12 through crosslinking and thermosetting; then coating the silica gel coating liquid on the lower part of the substrate layer 11 and curing to form a pressure-sensitive silica gel layer 13; and then, attaching the release protective layer 14 to the lower part of the pressure-sensitive silica gel layer 13 to obtain the screen protective film.
The preparation method of the screen protection film provided by the invention comprises the steps of firstly providing a polyester film with the retardation of 5000-20000 nm as a substrate layer 11, coating a hardening coating liquid on the substrate layer 11, and forming a hardening layer 12 through crosslinking and thermosetting; then coating the silica gel coating liquid on the lower part of the substrate layer 11 and curing to form a pressure-sensitive silica gel layer 13; and then, attaching the release protective layer 14 to the lower part of the pressure-sensitive silica gel layer 13 to obtain the screen protective film. The preparation method has the advantages of simple processing technology and easy operation.
In a preferred embodiment of the present invention, the temperature of the hardening coating liquid for crosslinking and thermosetting is 80 to 110 ℃;
preferably, the curing temperature of the silica gel coating liquid is 80-110 ℃.
The technical solution of the present invention will be further described with reference to examples and comparative examples.
Example 1
As shown in fig. 1, a method for preparing a screen protective film includes the steps of:
(1) the polyethylene terephthalate used as the base layer 11 was vacuum-dried at 130 ℃ and then melted at 280 ℃ in an extruder. According to the set thickness, the cast film is precisely metered by a metering pump, extruded from a lip die head, and cast on a cooling roller at 40 ℃ to obtain an unstretched film. The unstretched film is heated to 80 to 120 ℃ by a heated roll group and an infrared heater, and stretched by 1.5 times in the longitudinal direction by the roll group having a circumferential speed difference. Then, the longitudinally stretched film was introduced into a tenter to be stretched, and while holding the end of the film with clips, the film was introduced into a preheating chamber at a temperature of 100 to 140 ℃ to be stretched 4.0 times in the transverse direction. Then carrying out heat treatment at 160-240 ℃, cooling and rolling to obtain a substrate layer 11 with the thickness of 100 microns;
the retardation of the substrate layer 11 polyester film is 11700 nm;
(2) and uniformly mixing 90 parts of the waterborne polyurethane coating and 10 parts of titanium dioxide to form a coating liquid for the hardened layer 12, coating the coating liquid on the upper surface of the substrate layer 11, drying in a drying oven (80-110 ℃) and cooling to room temperature to obtain the coating of the high-refractive-index hardened layer 12. The refractive index of the high refractive index cured layer 12 was 1.53, and the thickness was 3 μm.
(3) 80 parts of organopolysiloxane, 0.5 part of silane coupling agent, 0.5 part of organohydrogenpolysiloxane and 0.5 part of platinum complex catalyst are dissolved in a solvent and uniformly mixed to form a coating liquid. And coating the coating liquid on the lower surface of the substrate layer 11, drying in a drying oven (80-110 ℃), and cooling to room temperature to obtain the pressure-sensitive silica gel layer 13.
(4) And attaching the release protective layer 14 with the thickness of 50 mu m to the pressure-sensitive silica gel layer 13 to obtain the screen protective film.
Example 2
This example is the same as example 1 except that the thickness of the base material layer 11 in step (1) is 50 μm; the retardation of the polyester film of the substrate layer 11 was 6122 nm.
Example 3
This example is the same as example 1 except that the thickness of the base material layer 11 in step (1) is 150 μm;
the retardation of the polyester film of the substrate layer 11 was 16390 nm.
Example 4
This example is the same as example 1 except that the coating liquid for the hardened layer 12 in step (2) is prepared by uniformly mixing 80 parts of the aqueous polyurethane coating material and 20 parts of the high refractive nanoparticles.
Comparative example 1
This example is the same as example 1 except that the unstretched film used for the base material layer 11 in step (1) is stretched 2.0 times in the longitudinal direction and 4.0 times in the transverse direction to give a thickness of the base material layer 11 of 100 μm;
the retardation of the polyester film of the substrate layer 11 was 4947 nm.
Comparative example 2
This example is the same as example 1 except that the unstretched film used for the base material layer 11 in step (1) is stretched 3.0 times in the longitudinal direction and 4.0 times in the transverse direction to give a thickness of the base material layer 11 of 100 μm;
the retardation of the polyester film of the substrate layer 11 was 1820 nm.
Comparative example 3
This example is the same as comparative example 1 except that the coating liquid for the hardened layer 12 in step (2) was prepared by uniformly mixing 80 parts of the aqueous polyurethane coating material and 20 parts of the high refractive nanoparticles.
Experimental example 1
The low rainbow texture screen protective films prepared in the embodiments 1 to 4 and the comparative examples 1 to 3 are cut into structures with the size of 5cm multiplied by 5cm, and various optical properties and mechanical properties are tested. The test items were as follows:
(1) refractive index and average thickness
The test was carried out using a film analyzer model F20, manufactured by FILMETRICS Inc., USA.
(2) Light transmittance and haze
The reflectance and transmittance measurements were performed using a HunterLab spectrocolorimeter, ColorQuest XE spectrocolorimeter, USA. The lower the reflectance, the better. The higher the light transmittance, the better.
(3) Amount of delay
The in-plane orthogonal biaxial refractive indices Nx and Ny of the polyester film used for the substrate layer 11 were measured by an Abbe refractometer M1 made by Aidang corporation of Japan. The retardation amount is obtained by multiplying the absolute value | Nx-Ny | of the aforementioned biaxial refractive index difference by the film thickness.
(4) Observation of rainbow patterns
The black glass is covered with a layer of distilled water, the screen protective film is tightly attached to the glass, and the screen protective film is placed in the sun or irradiated by a D65 light source, and is visually observed from the front and the oblique directions, and the following grades are recorded:
level 0: very pale rainbow lines were observed from the oblique direction;
level 1: obvious rainbow lines are observed from the oblique direction;
and 2, stage: intense rainbow lines were observed from an oblique direction.
(5) Hardness of pencil
The mechanical strength of the coating is tested by a DD-3086 electric pencil hardness tester, and HG/T4249-2012 standard of hardness test method for surface hardening film of optical functional film. Pencil hardness: the model 6B is the softest and the model 6H is the hardest, i.e. the hardness decreases from 1B to 6B and increases from 1H to 6H.
The observation results of the rainbow patterns of the specific embodiments are shown in the following table:
from the above experimental results, it can be seen that the low rainbow patterns screen protective film provided by the present invention has an excellent effect of reducing rainbow patterns. Compared with the prior art, the invention adopts the polyester film with high retardation as the substrate layer 11, and increases the in-plane birefringence of the PET by improving the retardation of the PET, so that the rainbow patterns can not be observed in a visual angle, and the rainbow patterns of the PET substrate are effectively reduced. According to the invention, the hardened layer 12 coated on the substrate layer 11 is matched with the refractive index of the substrate layer 11, and the rainbow texture deepening caused by coating the hardened layer 12 can be further reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A screen protective film comprising a base material layer, wherein the base material layer comprises a polyester film having a retardation of 5000nm to 20000 nm.
2. The screen protective film according to claim 1, further comprising a hardening layer, a pressure sensitive silicone layer, and a release protective layer.
3. The screen protective film according to claim 2, wherein the pressure sensitive silicone rubber layer is compounded on a release protective layer;
the base material layer is compounded on the pressure-sensitive silica gel layer;
the hardening layer is compounded on the base material layer.
4. The screen protective film according to claim 1, wherein the base material layer is mainly made of polyethylene terephthalate and/or polyethylene naphthalate;
preferably, the substrate layer is made of polyethylene terephthalate;
preferably, the light transmittance of the substrate layer is 88-92%, and the haze is 0.2-3.0%.
5. The screen protective film according to claim 2, wherein the hardening coating liquid of the hardened layer is mainly made of a dope and high-refractive nanoparticles;
preferably, the coating comprises at least one of an aqueous polyurethane, an acrylate, and an epoxy polyester;
more preferably, the aqueous polyurethane is a thermosetting coating comprising one or more of acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane;
more preferably, the acrylate is a thermosetting coating comprising one or more of butyl acrylate, methyl methacrylate, isobornyl methacrylate, glycidyl methacrylate;
more preferably, the epoxy polyester is a thermosetting coating, made mainly of epoxy resin and polyester resin;
preferably, the high refractive nanoparticles comprise at least one of zirconium dioxide, aluminum oxide, titanium dioxide, zinc oxide and antimony oxide;
preferably, the refractive index of the hardened layer is 1.40-1.58, and the hardness is 2H-3H.
6. The screen protective film according to claim 2, wherein the silicone coating liquid of the pressure-sensitive silicone layer is mainly made of an organopolysiloxane, a silane coupling agent, an organohydrogenpolysiloxane, and a platinum complex catalyst;
preferably, the light transmittance of the pressure-sensitive silica gel layer is 85% -93%, and the haze is 0.2% -3.0%.
7. The screen protective film according to claim 2, wherein the release protective layer comprises one of polyethylene terephthalate, polycarbonate, polymethyl methacrylate, and cyclic olefin polymer;
preferably, the thermal shrinkage rate of the release protection layer is 0-1% at 150 ℃.
8. The screen protective film according to claim 2, wherein the hardened layer has a thickness of 500nm to 5 μm;
the thickness of the substrate layer is 40-188 micrometers;
the thickness of the pressure-sensitive silica gel layer is 10-40 μm;
the thickness of the release protection layer is 30-100 mu m.
9. A method of manufacturing a screen protective film according to any one of claims 1 to 8, comprising the steps of:
providing a polyester film with the retardation of 5000 nm-20000 nm as a substrate layer, coating the hardening coating liquid on the substrate layer, and forming a hardening layer through crosslinking and thermosetting; then coating the silica gel coating liquid on the lower part of the substrate layer and curing to form a pressure-sensitive silica gel layer; and then, the release protective layer is attached to the lower part of the pressure-sensitive silica gel layer to prepare the screen protective film.
10. The method for preparing a screen protective film according to claim 9, wherein the temperature at which the hardening coating liquid is subjected to crosslinking and thermosetting is 80 to 110 ℃;
preferably, the curing temperature of the silica gel coating liquid is 80-110 ℃.
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| CN202011556685.XA CN112694845A (en) | 2020-12-24 | 2020-12-24 | Screen protection film and preparation method thereof |
| PCT/CN2020/142527 WO2022134197A1 (en) | 2020-12-24 | 2020-12-31 | Screen protection film and manufacturing method therefor |
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| CN113278374A (en) * | 2021-05-24 | 2021-08-20 | 宁波长阳科技股份有限公司 | Low rainbow line subtracts reflection screen protection film |
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| CN115851156A (en) * | 2022-09-20 | 2023-03-28 | 东莞市赛越新材料科技有限公司 | 3D curved surface protective film and preparation method thereof |
| CN115403809B (en) * | 2022-09-29 | 2024-02-13 | 广东省载诚新材料有限公司 | Diaphragm and manufacturing method thereof |
| CN116004141A (en) * | 2023-01-05 | 2023-04-25 | 太湖金张科技股份有限公司 | Buffer film and preparation method thereof |
| CN116794068B (en) * | 2023-05-31 | 2024-07-26 | 成都瑞波科材料科技有限公司 | Rainbow pattern detection device and method for coating process and coating process equipment |
| CN116640347A (en) * | 2023-06-30 | 2023-08-25 | 太仓斯迪克新材料科技有限公司 | Bending-resistant high-wear-resistant low-reflection protective film and preparation method thereof |
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